Ballm Sepol Mechanics
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mechanical Training Ball Mill + SEPOL
Krupp Polysius Corp.
Page 2
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Content:
• General Overview
• Mill Inlet • Mill Discharge • Mill Liners
• Ball Charge • Intermediate Diaphragm • Discharge Diaphragm • Slide Shoe Bearings
• COMBIFLEX Drive • Oil Supply System • Water Spray System • Grinding Aid System • Inspections and Maintenance Krupp Polysius Corp.
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
General Overview
Krupp Polysius Corp.
Page 4
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
General overview
2
9
3
Krupp Polysius Corp.
1 1.5 2 3 4.1 4.2 5 6 7 8 9 10 11
Mill cylinder Man-hole Mill head Mill head liners Mill liners chamber 1 Mill liners chamber 2 Intermediate diaphragm Discharge diaphragm Mill inlet Mill discharge Mill bearing Mill drive Water injection
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill cylinder of a one-compartment tube mill
Krupp Polysius Corp.
Page 6
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Inlet
Krupp Polysius Corp.
Page 7
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet 7.1 7.2 7.3 7.4 7.5 7.6
Krupp Polysius Corp.
Mill inlet Inlet cone Air socket Guard grille Sliding plates Wear plates
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet
Krupp Polysius Corp.
Page 9
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet-chute lining
Krupp Polysius Corp.
Page 10
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Discharge
Krupp Polysius Corp.
Page 11
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill discharge 8.1 8.2 8.3 8.4 8.5 8.6 8.7
Krupp Polysius Corp.
Discharge housing Outlet cone supporting structure Inspection door Seal Connecting flange for exhaust air Product discharge
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge of a cement mill ( 3,6 x 11 m)
Krupp Polysius Corp.
Page 13
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Liners
Krupp Polysius Corp.
Page 14
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill liners
chamber 1: lifting liners
Krupp Polysius Corp.
chamber 2: classifying (segregation) liners
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Classifying liners in chamber 2
Krupp Polysius Corp.
Page 16
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill shell without liners
Krupp Polysius Corp.
Page 17
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Ball Charge
Krupp Polysius Corp.
Page 18
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Example for ball size distribution for Ball Mills in closed circuit with a High Efficiency Separator separator (without pregrinding)
D Ball (mm) %
100
90
---
25
D Ball (mm) %
50
40
8
10
80
70
60
30 25 20 Chamber 2 (with SEPOL-separator) 30 25 20
Krupp Polysius Corp.
20
24
23
50 --17 15
average ball-weight (g/pc) 1590 average ball-weight (g/pc) 49
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Ball charge
1. Compartment: coarse balls
2. Compartment: ball filling classified because of liners
Krupp Polysius Corp.
Page 20
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate Diaphragm
Krupp Polysius Corp.
Page 21
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm for tube mills
Krupp Polysius Corp.
Page 22
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm
5.1 5.2 5.3 5.4 5.9
Krupp Polysius Corp.
Intermediate diaphragm framework lifter Support Slotted plate Segments of filler ring
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm
5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9
Krupp Polysius Corp.
Intermediate diaphragm framework lifter Support Slotted plate Backwall plate Cone Clamping ring Grid Segments of filler ring
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Adjustable diaphragm for tube mills grinding dry materials
slotted plates
adjustable lifters cone
diaphragm segment
Krupp Polysius Corp.
Page 25
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Segments of adjustable diaphragms with lifters in different positions
Krupp Polysius Corp.
Page 26
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Shifting the lifter
Krupp Polysius Corp.
Page 27
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge Diaphragm
Krupp Polysius Corp.
Page 28
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge diaphragm
6.1 6.2 6.3 6.5 6.10 6.11
Krupp Polysius Corp.
Discharge diaphragm framework Lifter Support Slotted plate segments of filler ring Insulation
Page 29
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge diaphragm 6.1 6.3 6.4 6.6 6.7 6.8 6.9 6.10 6.11
Krupp Polysius Corp.
Discharge diaphragm framework Support Support End disc Cone Clamping ring Grid Segments of filler ring Insulation
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
POLYSIUS discharge diaphragm for ball mills
Krupp Polysius Corp.
Page 31
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide Shoe Bearing
Krupp Polysius Corp.
Page 32
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing
low pressure lubrication
Krupp Polysius Corp.
Page 33
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe profile
1 6 7 8 9 10
Lower housing segment Bearing shoe Axial pivoting bearing Adjusting device of the bearing shoe Temperature sensor Bearing seat
Krupp Polysius Corp.
Page 34
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing
1 2 3 4 5 6 7 8 9 10
Krupp Polysius Corp.
Lower housing segment Dismounting flap Oil return socket Upper housing segment Y-seal Bearing shoe Axial pivoting bearing Adjusting device of the bearing shoe Temperature sensor Bearing seat
Page 35
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing arrangement
Krupp Polysius Corp.
Page 36
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing 17
17
Dismounting device
Krupp Polysius Corp.
Page 37
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Thrust (fixed) bearing for axial guide
Krupp Polysius Corp.
Page 38
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Actual sealing design for bearing cover • riding ring (mill shell) • oil spray ring • V- seal (open in 6 o´clock pos. for discharge of oil and dust • Y- seal with discharge holes in 6 o´clock position • bearing cover • additional cover with discharge hole • plate which prevents oil contamination of concrete foundation • concrete foundation
Krupp Polysius Corp.
inside of cover
Page 39
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX Drive
Krupp Polysius Corp.
Page 40
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX Drive
Finish grinding Ball mill
Krupp Polysius Corp.
Page 41
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Structure of the Ball mill, drive side end • • • • • • • •
bearing cover (drive end) slide ring mill inlet chute girth gear COMBIFLEX- gearbox slide shoe bearings additional cover additional plate
Krupp Polysius Corp.
Page 42
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
POLYSIUS Ball Mill; drive end
Krupp Polysius Corp.
Page 43
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX design (drawing) • input shaft • intermediate shaft (movable in axial direction) • output shaft • self- aligning pinion
Krupp Polysius Corp.
Page 44
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Self-aligning pinion
Permitted tilting: ± 10 mm
Krupp Polysius Corp.
Page 45
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX 2000
Y
Krupp Polysius Corp.
X Z
Page 46
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX internal gears
Input shaft
Self-aligning pinion
Direct contact with spur gear
Krupp Polysius Corp.
Page 47
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX, view from mill side
• second stage: upper pinion • intermediate shaft • input shaft
Krupp Polysius Corp.
Page 48
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX; arrangement of sole plates
Krupp Polysius Corp.
Page 49
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil Supply System
Krupp Polysius Corp.
Page 50
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil supply system: flow sheet for fixed bearing 31 32 33 35 36 37 38 39 40 41 42 43 50 51 52 53 54 55 56
Krupp Polysius Corp.
Oil reservoir Level switch Heating system Low-pressure pump Non-return valve Pressure limiting valve Oil filter Pressure switch High-pressure pump Non-return valve Pressure-relief valve Pressure switch Low-pressure pump Non-return valve Pressure relief valve Oil filter Oil cooler Flow monitor Pressure switch
Page 51
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil supply system: flow sheet for floating bearing
Krupp Polysius Corp.
40 41 42 43
High pressure pump Non-return valve Pressure relief valve Pressure switch
61 62
Oil reservoir Level switch
70 71 72 73 74 75
Low pressure pump Non-return valve pressure relief valve Oil filter Oil cooler Flow monitor
Page 52
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Water Spray System
Krupp Polysius Corp.
Page 53
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Water spray system
1.0; 2.0 1.1 1.2 1.3 1.4 1.5 2.5 3.0 3.1 3.2 3.3 4 5.0 5.2 5.3 6 7 8 9;12 10;13
11;14
Krupp Polysius Corp.
Injection lances Protective air fan Suction filter Motor Piping Injection nozzle Rotary connecting element Feed-water regulator Shut-off valve (water inlet) Drain valve Float switch Change-over filter Motor-pump unit Coupling Overflow valve Contact pressure gauge Drain and vent valves Solenoid valve Motorized valve for injection lances 1.0; 2.0 Flowmeter for injection lances 1.0; 2.0 Pressure gauge for injection lances 1.0; 2.0
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Water spray system 3.0 3.1 3.2
Feed-water regulator Shut-off valve (water inlet) Drain valve
4
Change-over filter
5.0 5.1 5.2 5.3 5.4
Motor-pump unit Motor Coupling Overflow valve Drain plug
6 7 8 9;12
Contact pressure gauge Drain and vent valves Solenoid valve Motorized valve for injection lances 1.0; 2.0 Flowmeter for injection lances 1.0; 2.0 Pressure gauge for injection lances 1.0; 2.0
10;13 11;14
Krupp Polysius Corp.
Page 55
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Grinding Aid System
Krupp Polysius Corp.
Page 56
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Grinding Aid System
Krupp Polysius Corp.
Page 57
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mechanical Training
SEPOL Separator
Krupp Polysius Corp.
Page 58
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Content • Operation Description • Separator Wear and Wear Protection • SEPOL Inlet Damper • SEPOL Internals • Material Feed • SEPOL Guide Vanes
• SEPOL Rotor • Rotor Seal • SEPOL Supports and Bearings
Krupp Polysius Corp.
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Operation Description
Krupp Polysius Corp.
Page 60
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation description of the Polysius separator SEPOL NSV Motor
Material feed
Material feed housing
Disperion plate Rotor
Guide vanes
Adjustable air inlet louvre
Separating room
Coarse material passes rotor not and drops into coarse collection cone Fineproduct passes rotor
Coarse material back to mill
and is transported with the air to the Cyclones or baghouse
Tipping valve
Krupp Polysius Corp.
Page 61
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation description of SEPOL separator NSV FEED BOX
DISPERSION PLATE AIR GUIDE PLATE
ROTOR BLADES GUIDE VANE
AIR INLET DUCT
FRESH AIR OR CIRCULATING AIR SEPARATOR FEED SEPARATOR REJECTS VENT AIR WITH FINES
CYCLONE
REJECT CONE
Krupp Polysius Corp.
Page 62
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Operation description of SEPOL separator NSV without cyclones FEED BOX
DISPERSION PLATE AIR GUIDE PLATE
ROTOR BLADES GUIDE VANE
AIR INLET DUCT
FRESH AIR OR CIRCULATING AIR SEPARATOR FEED SEPARATOR REJECTS VENT AIR WITH FINES
REJECT CONE
Krupp Polysius Corp.
Page 63
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Polysius SEPOL separator NSV Protection tube for drive shaft Dispersion plate Baffle ring
Rotor blades Inlet spiral
Guide vanes
Wear ring for guide vane support
Air / Product Discharge Bend
Krupp Polysius Corp.
Wear protection for bearing suspension and grease lines reject cone
Page 64
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Separator Wear and Wear Protection
Krupp Polysius Corp.
Page 65
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL NSV standard wear protection Protection tube for drive shaft: mild steel Lining of dispersion plate: ceramic mortar Baffle ring: mild steel
Rotor blades: mild steel
Lining circumference of inlet spiral: AR plate
Guide vanes: AR plate
Wear ring: compound steel plate
Lining of air/product discharge: ceramic mortar
Krupp Polysius Corp.
Bearing suspension and grease lines: ceramic tube Reject cone: completely of AR plate
Page 66
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Wear - influencing factors
• Process parameter:
- Velocity of particles - Angle of impact - Material load / bulk material mass
• Wear medium:
- Shape of particles - Hardness of particles - Grain size
• Type of wear protection:
- Hardness - Surface
Krupp Polysius Corp.
Page 67
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Wear protection materials for SEPOL separator • Cast basalt
• Ceramic mortar (DENSIT WEARSTOP M40, M60, M80) • Al2O3 - ceramic (KALOCER or similar) • Compound steel with hard facing (EURODUR) • Wear resistant steel (CREUSABRO 4000)
Krupp Polysius Corp.
Page 68
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL NSV high-quality wear protection type “C” Protection tube for drive shaft: compound steel plate Lining of dispersion plate: ceramic mortar Baffle ring: compound steel plate
Rotor blades: compound steel plate
Lining circumference of inlet spiral: AR plate
Guide vanes: compound steel plate
Wear ring: compound steel plate
Lining of air/product discharge: ceramic mortar
Krupp Polysius Corp.
Bearing suspension and grease lines: ceramic tube Reject cone and lower housing: ceramic mortar
Page 69
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Standard wear protection for SEPOL with cyclones Wear protection of separator:
Duct work - clean gas side: without waer liners
See separate sheet
Collecting duct - clean gas side: without wear liners
Cyclone ceiling: Ceramic mortar Air fan housing: AR plate
Cyclone cone: Ceramic mortar
Rotor air fan: Hard faced compound steel
Ceramic mortar AR plate
Krupp Polysius Corp.
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Precautions to reduce SEPOL wear • Early detection of wear, repair of damaged points, countermeasures • Avoid junction points and uneveness in the lining surface (turbulences with consequential erosion) • Check the distribution of the material to be separated and improve, if required and possible • Check the air distribution (velocities) and adjust, if required • Measure and reduce the air flow rate to the designed air flow rate, if required • Check the guide vane position: the angle of aperture should be between 15 and 30º • Check the gap of the rotor seal at regular intervals and readjust to approx. 2mm (depending on the operating temperature and the size of the machine)
Krupp Polysius Corp.
Page 71
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SEPOL Inlet Damper
Krupp Polysius Corp.
Page 72
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL inlet damper
Air though one channel can be throttled in case of heavy wear at rotor blades in this area
Air inlet damper: all six valves can be adjusted individually. They are normally fully open, but can be adjusted in case of uneven air distribution
Separating air (ambient or recirculated air)
Two horizontal guide plates divide the SEPOL’s upper housing into three channels
SEPOL air inlet spiral
Krupp Polysius Corp.
Page 73
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Material Feed
Krupp Polysius Corp.
Page 74
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Material feed Material inlet Split feed housing
Inspection door
Conical outlet
Krupp Polysius Corp.
Page 75
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SEPOL Internals
Krupp Polysius Corp.
Page 76
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SEPOL internals Rotor blades Rotor shaft
Lower shaft bearing Air inlet spiral
Guide vanes
Krupp Polysius Corp.
Page 77
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SEPOL Guide Vanes
Krupp Polysius Corp.
Page 78
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SEPOL guide vanes
5-15 º clogging of guide vanes possible wear at guide vanes possible 15- 30º = normal guide vane position 25º = setting recommended by Polysius Above 40º • vibrating of the guide vanes possible • excessive wear at the rotor blades • deposits of coarse material in the air inlet spiral • oversized material might get dragged into finished product
Krupp Polysius Corp.
Page 79
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SEPOL Rotor
Krupp Polysius Corp.
Page 80
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL separator rotor Rotor shaft
Material feed
Guide vanes Dispersion plate Air inlet spiral Rotor blades
Krupp Polysius Corp.
Page 81
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL rotor Parted rotor blades of compound steel plates with screwed support ring Screwed support ring Rotor blade fastening
Though base material
Hard facing layer, approx. 63 HRC
Krupp Polysius Corp.
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Rotor Seal
Krupp Polysius Corp.
Page 83
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Rotor seal
Rotor
Internal seal ring, adjustable
Material discharge bend (seal area adjusted during erection)
Rejects “apron”
External labyrinth, replaceable External seal ring, adjustable
Krupp Polysius Corp.
Page 84
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Rotor seal with seal air Rotor blade
Internal seal ring Rotor seal area
External seal ring Rejects “apron” Separator air and product discharge Seal air
Krupp Polysius Corp.
Page 85
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Supply of seal air to the rotor seal Rejects “apron”
Seal air Separator air and product discharge
Krupp Polysius Corp.
Page 86
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Supports and Bearings
Krupp Polysius Corp.
Page 87
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Lower SEPOL shaft and rotor bearing Ceramic wear protection
Supporting steel Tube Spring discs
Grease lines Notice: To extend lifetime, rotate the ceramic tubes early enough when wear occurs!
Krupp Polysius Corp.
Page 88
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Lower support of guide vanes
Guide vane bearing pin
Lower guide vane bearing, segmented, adjustable Segmented protective ring, made of compound steel
Guide vanes tilted by 15º
Krupp Polysius Corp.
Page 89
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Bearing and drive traverse
Drive support
Material feed
Guide vanes pins for bearing and adjustment
Krupp Polysius Corp.
Page 90
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Question: SEPOL internals
Krupp Polysius Corp.
Page 91
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Maintenance and Servicing Requirements SEPOL Separator
Krupp Polysius Corp.
Page 92
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Abnormal noises and vibrations
Frequency
2.
Functioning of flap valves
weekly
3.
Drive unit - gear unit - oil cooler - motor - shrunk on disk - coupling
*)
1.
Daily (local checking, vibration monitoring)
Irregularities and their causes Imbalance - due to formation of coating
Measures, Remarks - Clean - Avoid static electric charge (by earthing)
- Incorrectly set weights - Jamming flaps - Defective bearing
- Readjust
*) acc. to separate machine manual or manufacturer’s instructions
Krupp Polysius Corp.
Page 93
4.
5. 6.
7.
8.
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Circulating air fan - rotor
Frequency *) (Vibration monitoring)
- inlet nozzle
if necessary
Checking the lubrication pipes for leakage Checking antifriction bearings including labyrinth seals for sufficient supply of lubricants Central lubrication system (if existent)
Every 2 weeks (visual check) Every 2 weeks (visual check; temperature monitoring)
Cracks and leaks
Every 4 weeks (visual check)
Irregularities and their causes Vibrations - due to formation of coating - Improper balancing - Wear; setting not concentric
Measures, Remarks See Point 1
- balance the rotor - Replace wearing part, adjust the nozzle
*)
Repair
*) acc. to separate machine manual or manufacturer’s instructions
Krupp Polysius Corp.
Page 94
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Frequency 9.
Irregularities Measures, and their causes Remarks Wear Every 4 weeks Repair or refurbish - Lining of the upper (depends on the as necessary. section of the housing wear attrition) - Lining of the dispersion Checking and plate working inside the - Lining of the rejects cone separator must only - Lining of the feed box be done after the - Lining of the turning unit has been fixture on the rotor shaft disconnected from - Lining of the cyclone the electricity cover supply. - Lining of the cyclones - Lining of the distributor housing and the piping - Wear protection of lubrication pipe - Wear protection of tension rods - Rotor blades - Guide vane ring and guide vanes - Access ring
Krupp Polysius Corp.
Page 95
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Frequency 10.
Bolted connections for Every 6 month prescribed tightening torque (for the 1st commissioning after 100 operating hours)
Krupp Polysius Corp.
Irregularities Measures, and their causes Remarks
Page 96
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Troubleshooting SEPOL Separator
Krupp Polysius Corp.
Page 97
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Nr.
Problem
1.
Finished material Feed material temperature too high too hot (danger of hemihydrate formation)
2.
Granulometric distribution is too flat
3.
Cause
Guide vane ring is opened too far Granulometric Excessive distribution is too steep tangential (water demand of setting of the cement possibly too guide vanes high)
Krupp Polysius Corp.
Measures
Note
- Feed in fresh air before separator (possibly install fresh-air-pipesockets) - Try increasing the mill’s aeration - Inject water into the mill - set guide vanes more tangentially
Sufficient dedusting is necessary (system fan and system filter must be sufficiently big)
- set guide vanes more radial - Throttle the circulating air fan or system fan (lower the separator efficiency)
In steps of 5, max 10
In steps of 5, max 10
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Nr.
Problem
Cause
4.
Oversize grains in finished material
Ineffective - Re-adjust sealing ring sealing between rotor and fines discharge Leaky - Seal the door inspection door in finished product outlet
5.
6.
Coatings on the rotor blades
High water demand of the product
High material moisture content (e.g. gypsum, admixtures) Static electric charge Granulometric distribution too steep
Krupp Polysius Corp.
Measures
Note
Suction due to pressure difference between finished material pipe and tailings cone
- Reduce moisture content of material - Additional heating - Earth the separator - Adjust guide vanes
Flatter curve in RRS diagram (see Point 3)
Page 99
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Nr.
Problem
7.
Poor distribution of the Unfavorable separator feed material design of the inlet cone
8.
Overpressure in separator (dust formation)
Cause
Excessive flow speed of the separator feed material in the feed through Wear on distribution plate Insufficient dedusting Fresh air flap opened too wide
Krupp Polysius Corp.
Measures
Note
- Alter the inlet cone (possibly correct the cone collar to suit the flow of material) - Throttle conveying air in the feed through
- Repair distribution plate
- Open damper before dedusting fan wider
Deduster and fan must be adequate
- Throttle fresh-air flap
Deduster and fan must be adequate
Page 100
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Nr.
Problem
Cause
9.
Excessive negative pressure in separator
Damper before - Throttle dedusting air dedusting fan open too wide
10.
Unfavorable course of Tromp curve (high material bypass)
- Improve the process technological environment (sufficient aeration of mill etc) Separator feed - Add grinding aid at the material mill contains agglomerated constituents Insufficient - Install fresh air flap volume of separating air
Krupp Polysius Corp.
Measures
Note Set negative pressure before separator to the point where dust is just prevented from emerging at the separator feed (1-2 mbar)
Take the fan capacity into account
Page 101
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Nr.
Problem
1.
Finished material Feed material temperature too high too hot (danger of hemihydrate formation)
2.
Granulometric distribution is too flat
3.
Cause
Guide vane ring is opened too far Granulometric Excessive distribution is too steep tangential (water demand of setting of the cement possibly too guide vanes high)
Krupp Polysius Corp.
Measures
Note
- Feed in fresh air before separator (possibly install fresh-air-pipesockets) - Try increasing the mill’s aeration - Inject water into the mill - set guide vanes more tangentially
Sufficient dedusting is necessary (system fan and system filter must be sufficiently big)
- set guide vanes more radial - Throttle the circulating air fan or system fan (lower the separator efficiency)
In steps of 5, max 10
In steps of 5, max 10
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mechanical Training Ball Mill + SEPOL
Krupp Polysius Corp.
Page 2
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Content:
• General Overview
• Mill Inlet • Mill Discharge • Mill Liners
• Ball Charge • Intermediate Diaphragm • Discharge Diaphragm • Slide Shoe Bearings
• COMBIFLEX Drive • Oil Supply System • Water Spray System • Grinding Aid System • Inspections and Maintenance Krupp Polysius Corp.
Page 3
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
General Overview
Krupp Polysius Corp.
Page 4
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
General overview
2
9
3
Krupp Polysius Corp.
1 1.5 2 3 4.1 4.2 5 6 7 8 9 10 11
Mill cylinder Man-hole Mill head Mill head liners Mill liners chamber 1 Mill liners chamber 2 Intermediate diaphragm Discharge diaphragm Mill inlet Mill discharge Mill bearing Mill drive Water injection
Page 5
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill cylinder of a one-compartment tube mill
Krupp Polysius Corp.
Page 6
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Inlet
Krupp Polysius Corp.
Page 7
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet 7.1 7.2 7.3 7.4 7.5 7.6
Krupp Polysius Corp.
Mill inlet Inlet cone Air socket Guard grille Sliding plates Wear plates
Page 8
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet
Krupp Polysius Corp.
Page 9
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill inlet-chute lining
Krupp Polysius Corp.
Page 10
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Discharge
Krupp Polysius Corp.
Page 11
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill discharge 8.1 8.2 8.3 8.4 8.5 8.6 8.7
Krupp Polysius Corp.
Discharge housing Outlet cone supporting structure Inspection door Seal Connecting flange for exhaust air Product discharge
Page 12
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge of a cement mill ( 3,6 x 11 m)
Krupp Polysius Corp.
Page 13
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill Liners
Krupp Polysius Corp.
Page 14
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill liners
chamber 1: lifting liners
Krupp Polysius Corp.
chamber 2: classifying (segregation) liners
Page 15
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Classifying liners in chamber 2
Krupp Polysius Corp.
Page 16
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mill shell without liners
Krupp Polysius Corp.
Page 17
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Ball Charge
Krupp Polysius Corp.
Page 18
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Example for ball size distribution for Ball Mills in closed circuit with a High Efficiency Separator separator (without pregrinding)
D Ball (mm) %
100
90
---
25
D Ball (mm) %
50
40
8
10
80
70
60
30 25 20 Chamber 2 (with SEPOL-separator) 30 25 20
Krupp Polysius Corp.
20
24
23
50 --17 15
average ball-weight (g/pc) 1590 average ball-weight (g/pc) 49
Page 19
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Ball charge
1. Compartment: coarse balls
2. Compartment: ball filling classified because of liners
Krupp Polysius Corp.
Page 20
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate Diaphragm
Krupp Polysius Corp.
Page 21
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm for tube mills
Krupp Polysius Corp.
Page 22
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm
5.1 5.2 5.3 5.4 5.9
Krupp Polysius Corp.
Intermediate diaphragm framework lifter Support Slotted plate Segments of filler ring
Page 23
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Intermediate diaphragm
5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9
Krupp Polysius Corp.
Intermediate diaphragm framework lifter Support Slotted plate Backwall plate Cone Clamping ring Grid Segments of filler ring
Page 24
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Adjustable diaphragm for tube mills grinding dry materials
slotted plates
adjustable lifters cone
diaphragm segment
Krupp Polysius Corp.
Page 25
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Segments of adjustable diaphragms with lifters in different positions
Krupp Polysius Corp.
Page 26
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Shifting the lifter
Krupp Polysius Corp.
Page 27
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge Diaphragm
Krupp Polysius Corp.
Page 28
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge diaphragm
6.1 6.2 6.3 6.5 6.10 6.11
Krupp Polysius Corp.
Discharge diaphragm framework Lifter Support Slotted plate segments of filler ring Insulation
Page 29
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Discharge diaphragm 6.1 6.3 6.4 6.6 6.7 6.8 6.9 6.10 6.11
Krupp Polysius Corp.
Discharge diaphragm framework Support Support End disc Cone Clamping ring Grid Segments of filler ring Insulation
Page 30
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
POLYSIUS discharge diaphragm for ball mills
Krupp Polysius Corp.
Page 31
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide Shoe Bearing
Krupp Polysius Corp.
Page 32
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing
low pressure lubrication
Krupp Polysius Corp.
Page 33
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe profile
1 6 7 8 9 10
Lower housing segment Bearing shoe Axial pivoting bearing Adjusting device of the bearing shoe Temperature sensor Bearing seat
Krupp Polysius Corp.
Page 34
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing
1 2 3 4 5 6 7 8 9 10
Krupp Polysius Corp.
Lower housing segment Dismounting flap Oil return socket Upper housing segment Y-seal Bearing shoe Axial pivoting bearing Adjusting device of the bearing shoe Temperature sensor Bearing seat
Page 35
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing arrangement
Krupp Polysius Corp.
Page 36
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Slide shoe bearing 17
17
Dismounting device
Krupp Polysius Corp.
Page 37
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Thrust (fixed) bearing for axial guide
Krupp Polysius Corp.
Page 38
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Actual sealing design for bearing cover • riding ring (mill shell) • oil spray ring • V- seal (open in 6 o´clock pos. for discharge of oil and dust • Y- seal with discharge holes in 6 o´clock position • bearing cover • additional cover with discharge hole • plate which prevents oil contamination of concrete foundation • concrete foundation
Krupp Polysius Corp.
inside of cover
Page 39
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX Drive
Krupp Polysius Corp.
Page 40
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX Drive
Finish grinding Ball mill
Krupp Polysius Corp.
Page 41
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Structure of the Ball mill, drive side end • • • • • • • •
bearing cover (drive end) slide ring mill inlet chute girth gear COMBIFLEX- gearbox slide shoe bearings additional cover additional plate
Krupp Polysius Corp.
Page 42
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
POLYSIUS Ball Mill; drive end
Krupp Polysius Corp.
Page 43
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX design (drawing) • input shaft • intermediate shaft (movable in axial direction) • output shaft • self- aligning pinion
Krupp Polysius Corp.
Page 44
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Self-aligning pinion
Permitted tilting: ± 10 mm
Krupp Polysius Corp.
Page 45
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX 2000
Y
Krupp Polysius Corp.
X Z
Page 46
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX internal gears
Input shaft
Self-aligning pinion
Direct contact with spur gear
Krupp Polysius Corp.
Page 47
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX, view from mill side
• second stage: upper pinion • intermediate shaft • input shaft
Krupp Polysius Corp.
Page 48
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
COMBIFLEX; arrangement of sole plates
Krupp Polysius Corp.
Page 49
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil Supply System
Krupp Polysius Corp.
Page 50
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil supply system: flow sheet for fixed bearing 31 32 33 35 36 37 38 39 40 41 42 43 50 51 52 53 54 55 56
Krupp Polysius Corp.
Oil reservoir Level switch Heating system Low-pressure pump Non-return valve Pressure limiting valve Oil filter Pressure switch High-pressure pump Non-return valve Pressure-relief valve Pressure switch Low-pressure pump Non-return valve Pressure relief valve Oil filter Oil cooler Flow monitor Pressure switch
Page 51
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Oil supply system: flow sheet for floating bearing
Krupp Polysius Corp.
40 41 42 43
High pressure pump Non-return valve Pressure relief valve Pressure switch
61 62
Oil reservoir Level switch
70 71 72 73 74 75
Low pressure pump Non-return valve pressure relief valve Oil filter Oil cooler Flow monitor
Page 52
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Water Spray System
Krupp Polysius Corp.
Page 53
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Water spray system
1.0; 2.0 1.1 1.2 1.3 1.4 1.5 2.5 3.0 3.1 3.2 3.3 4 5.0 5.2 5.3 6 7 8 9;12 10;13
11;14
Krupp Polysius Corp.
Injection lances Protective air fan Suction filter Motor Piping Injection nozzle Rotary connecting element Feed-water regulator Shut-off valve (water inlet) Drain valve Float switch Change-over filter Motor-pump unit Coupling Overflow valve Contact pressure gauge Drain and vent valves Solenoid valve Motorized valve for injection lances 1.0; 2.0 Flowmeter for injection lances 1.0; 2.0 Pressure gauge for injection lances 1.0; 2.0
Page 54
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Water spray system 3.0 3.1 3.2
Feed-water regulator Shut-off valve (water inlet) Drain valve
4
Change-over filter
5.0 5.1 5.2 5.3 5.4
Motor-pump unit Motor Coupling Overflow valve Drain plug
6 7 8 9;12
Contact pressure gauge Drain and vent valves Solenoid valve Motorized valve for injection lances 1.0; 2.0 Flowmeter for injection lances 1.0; 2.0 Pressure gauge for injection lances 1.0; 2.0
10;13 11;14
Krupp Polysius Corp.
Page 55
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Grinding Aid System
Krupp Polysius Corp.
Page 56
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Grinding Aid System
Krupp Polysius Corp.
Page 57
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Mechanical Training
SEPOL Separator
Krupp Polysius Corp.
Page 58
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Content • Operation Description • Separator Wear and Wear Protection • SEPOL Inlet Damper • SEPOL Internals • Material Feed • SEPOL Guide Vanes
• SEPOL Rotor • Rotor Seal • SEPOL Supports and Bearings
Krupp Polysius Corp.
Page 59
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation Description
Krupp Polysius Corp.
Page 60
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation description of the Polysius separator SEPOL NSV Motor
Material feed
Material feed housing
Disperion plate Rotor
Guide vanes
Adjustable air inlet louvre
Separating room
Coarse material passes rotor not and drops into coarse collection cone Fineproduct passes rotor
Coarse material back to mill
and is transported with the air to the Cyclones or baghouse
Tipping valve
Krupp Polysius Corp.
Page 61
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation description of SEPOL separator NSV FEED BOX
DISPERSION PLATE AIR GUIDE PLATE
ROTOR BLADES GUIDE VANE
AIR INLET DUCT
FRESH AIR OR CIRCULATING AIR SEPARATOR FEED SEPARATOR REJECTS VENT AIR WITH FINES
CYCLONE
REJECT CONE
Krupp Polysius Corp.
Page 62
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Operation description of SEPOL separator NSV without cyclones FEED BOX
DISPERSION PLATE AIR GUIDE PLATE
ROTOR BLADES GUIDE VANE
AIR INLET DUCT
FRESH AIR OR CIRCULATING AIR SEPARATOR FEED SEPARATOR REJECTS VENT AIR WITH FINES
REJECT CONE
Krupp Polysius Corp.
Page 63
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Polysius SEPOL separator NSV Protection tube for drive shaft Dispersion plate Baffle ring
Rotor blades Inlet spiral
Guide vanes
Wear ring for guide vane support
Air / Product Discharge Bend
Krupp Polysius Corp.
Wear protection for bearing suspension and grease lines reject cone
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Separator Wear and Wear Protection
Krupp Polysius Corp.
Page 65
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL NSV standard wear protection Protection tube for drive shaft: mild steel Lining of dispersion plate: ceramic mortar Baffle ring: mild steel
Rotor blades: mild steel
Lining circumference of inlet spiral: AR plate
Guide vanes: AR plate
Wear ring: compound steel plate
Lining of air/product discharge: ceramic mortar
Krupp Polysius Corp.
Bearing suspension and grease lines: ceramic tube Reject cone: completely of AR plate
Page 66
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Wear - influencing factors
• Process parameter:
- Velocity of particles - Angle of impact - Material load / bulk material mass
• Wear medium:
- Shape of particles - Hardness of particles - Grain size
• Type of wear protection:
- Hardness - Surface
Krupp Polysius Corp.
Page 67
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Wear protection materials for SEPOL separator • Cast basalt
• Ceramic mortar (DENSIT WEARSTOP M40, M60, M80) • Al2O3 - ceramic (KALOCER or similar) • Compound steel with hard facing (EURODUR) • Wear resistant steel (CREUSABRO 4000)
Krupp Polysius Corp.
Page 68
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL NSV high-quality wear protection type “C” Protection tube for drive shaft: compound steel plate Lining of dispersion plate: ceramic mortar Baffle ring: compound steel plate
Rotor blades: compound steel plate
Lining circumference of inlet spiral: AR plate
Guide vanes: compound steel plate
Wear ring: compound steel plate
Lining of air/product discharge: ceramic mortar
Krupp Polysius Corp.
Bearing suspension and grease lines: ceramic tube Reject cone and lower housing: ceramic mortar
Page 69
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Standard wear protection for SEPOL with cyclones Wear protection of separator:
Duct work - clean gas side: without waer liners
See separate sheet
Collecting duct - clean gas side: without wear liners
Cyclone ceiling: Ceramic mortar Air fan housing: AR plate
Cyclone cone: Ceramic mortar
Rotor air fan: Hard faced compound steel
Ceramic mortar AR plate
Krupp Polysius Corp.
Page 70
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Precautions to reduce SEPOL wear • Early detection of wear, repair of damaged points, countermeasures • Avoid junction points and uneveness in the lining surface (turbulences with consequential erosion) • Check the distribution of the material to be separated and improve, if required and possible • Check the air distribution (velocities) and adjust, if required • Measure and reduce the air flow rate to the designed air flow rate, if required • Check the guide vane position: the angle of aperture should be between 15 and 30º • Check the gap of the rotor seal at regular intervals and readjust to approx. 2mm (depending on the operating temperature and the size of the machine)
Krupp Polysius Corp.
Page 71
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Inlet Damper
Krupp Polysius Corp.
Page 72
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL inlet damper
Air though one channel can be throttled in case of heavy wear at rotor blades in this area
Air inlet damper: all six valves can be adjusted individually. They are normally fully open, but can be adjusted in case of uneven air distribution
Separating air (ambient or recirculated air)
Two horizontal guide plates divide the SEPOL’s upper housing into three channels
SEPOL air inlet spiral
Krupp Polysius Corp.
Page 73
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Material Feed
Krupp Polysius Corp.
Page 74
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Material feed Material inlet Split feed housing
Inspection door
Conical outlet
Krupp Polysius Corp.
Page 75
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Internals
Krupp Polysius Corp.
Page 76
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL internals Rotor blades Rotor shaft
Lower shaft bearing Air inlet spiral
Guide vanes
Krupp Polysius Corp.
Page 77
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Guide Vanes
Krupp Polysius Corp.
Page 78
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL guide vanes
5-15 º clogging of guide vanes possible wear at guide vanes possible 15- 30º = normal guide vane position 25º = setting recommended by Polysius Above 40º • vibrating of the guide vanes possible • excessive wear at the rotor blades • deposits of coarse material in the air inlet spiral • oversized material might get dragged into finished product
Krupp Polysius Corp.
Page 79
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Rotor
Krupp Polysius Corp.
Page 80
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL separator rotor Rotor shaft
Material feed
Guide vanes Dispersion plate Air inlet spiral Rotor blades
Krupp Polysius Corp.
Page 81
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL rotor Parted rotor blades of compound steel plates with screwed support ring Screwed support ring Rotor blade fastening
Though base material
Hard facing layer, approx. 63 HRC
Krupp Polysius Corp.
Page 82
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Rotor Seal
Krupp Polysius Corp.
Page 83
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Rotor seal
Rotor
Internal seal ring, adjustable
Material discharge bend (seal area adjusted during erection)
Rejects “apron”
External labyrinth, replaceable External seal ring, adjustable
Krupp Polysius Corp.
Page 84
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Rotor seal with seal air Rotor blade
Internal seal ring Rotor seal area
External seal ring Rejects “apron” Separator air and product discharge Seal air
Krupp Polysius Corp.
Page 85
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Supply of seal air to the rotor seal Rejects “apron”
Seal air Separator air and product discharge
Krupp Polysius Corp.
Page 86
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
SEPOL Supports and Bearings
Krupp Polysius Corp.
Page 87
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Lower SEPOL shaft and rotor bearing Ceramic wear protection
Supporting steel Tube Spring discs
Grease lines Notice: To extend lifetime, rotate the ceramic tubes early enough when wear occurs!
Krupp Polysius Corp.
Page 88
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Lower support of guide vanes
Guide vane bearing pin
Lower guide vane bearing, segmented, adjustable Segmented protective ring, made of compound steel
Guide vanes tilted by 15º
Krupp Polysius Corp.
Page 89
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Bearing and drive traverse
Drive support
Material feed
Guide vanes pins for bearing and adjustment
Krupp Polysius Corp.
Page 90
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Question: SEPOL internals
Krupp Polysius Corp.
Page 91
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Maintenance and Servicing Requirements SEPOL Separator
Krupp Polysius Corp.
Page 92
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Abnormal noises and vibrations
Frequency
2.
Functioning of flap valves
weekly
3.
Drive unit - gear unit - oil cooler - motor - shrunk on disk - coupling
*)
1.
Daily (local checking, vibration monitoring)
Irregularities and their causes Imbalance - due to formation of coating
Measures, Remarks - Clean - Avoid static electric charge (by earthing)
- Incorrectly set weights - Jamming flaps - Defective bearing
- Readjust
*) acc. to separate machine manual or manufacturer’s instructions
Krupp Polysius Corp.
Page 93
4.
5. 6.
7.
8.
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Circulating air fan - rotor
Frequency *) (Vibration monitoring)
- inlet nozzle
if necessary
Checking the lubrication pipes for leakage Checking antifriction bearings including labyrinth seals for sufficient supply of lubricants Central lubrication system (if existent)
Every 2 weeks (visual check) Every 2 weeks (visual check; temperature monitoring)
Cracks and leaks
Every 4 weeks (visual check)
Irregularities and their causes Vibrations - due to formation of coating - Improper balancing - Wear; setting not concentric
Measures, Remarks See Point 1
- balance the rotor - Replace wearing part, adjust the nozzle
*)
Repair
*) acc. to separate machine manual or manufacturer’s instructions
Krupp Polysius Corp.
Page 94
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Frequency 9.
Irregularities Measures, and their causes Remarks Wear Every 4 weeks Repair or refurbish - Lining of the upper (depends on the as necessary. section of the housing wear attrition) - Lining of the dispersion Checking and plate working inside the - Lining of the rejects cone separator must only - Lining of the feed box be done after the - Lining of the turning unit has been fixture on the rotor shaft disconnected from - Lining of the cyclone the electricity cover supply. - Lining of the cyclones - Lining of the distributor housing and the piping - Wear protection of lubrication pipe - Wear protection of tension rods - Rotor blades - Guide vane ring and guide vanes - Access ring
Krupp Polysius Corp.
Page 95
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Necessary regular checks Frequency 10.
Bolted connections for Every 6 month prescribed tightening torque (for the 1st commissioning after 100 operating hours)
Krupp Polysius Corp.
Irregularities Measures, and their causes Remarks
Page 96
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Troubleshooting SEPOL Separator
Krupp Polysius Corp.
Page 97
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Nr.
Problem
1.
Finished material Feed material temperature too high too hot (danger of hemihydrate formation)
2.
Granulometric distribution is too flat
3.
Cause
Guide vane ring is opened too far Granulometric Excessive distribution is too steep tangential (water demand of setting of the cement possibly too guide vanes high)
Krupp Polysius Corp.
Measures
Note
- Feed in fresh air before separator (possibly install fresh-air-pipesockets) - Try increasing the mill’s aeration - Inject water into the mill - set guide vanes more tangentially
Sufficient dedusting is necessary (system fan and system filter must be sufficiently big)
- set guide vanes more radial - Throttle the circulating air fan or system fan (lower the separator efficiency)
In steps of 5, max 10
In steps of 5, max 10
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L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Nr.
Problem
Cause
4.
Oversize grains in finished material
Ineffective - Re-adjust sealing ring sealing between rotor and fines discharge Leaky - Seal the door inspection door in finished product outlet
5.
6.
Coatings on the rotor blades
High water demand of the product
High material moisture content (e.g. gypsum, admixtures) Static electric charge Granulometric distribution too steep
Krupp Polysius Corp.
Measures
Note
Suction due to pressure difference between finished material pipe and tailings cone
- Reduce moisture content of material - Additional heating - Earth the separator - Adjust guide vanes
Flatter curve in RRS diagram (see Point 3)
Page 99
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Nr.
Problem
7.
Poor distribution of the Unfavorable separator feed material design of the inlet cone
8.
Overpressure in separator (dust formation)
Cause
Excessive flow speed of the separator feed material in the feed through Wear on distribution plate Insufficient dedusting Fresh air flap opened too wide
Krupp Polysius Corp.
Measures
Note
- Alter the inlet cone (possibly correct the cone collar to suit the flow of material) - Throttle conveying air in the feed through
- Repair distribution plate
- Open damper before dedusting fan wider
Deduster and fan must be adequate
- Throttle fresh-air flap
Deduster and fan must be adequate
Page 100
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Nr.
Problem
Cause
9.
Excessive negative pressure in separator
Damper before - Throttle dedusting air dedusting fan open too wide
10.
Unfavorable course of Tromp curve (high material bypass)
- Improve the process technological environment (sufficient aeration of mill etc) Separator feed - Add grinding aid at the material mill contains agglomerated constituents Insufficient - Install fresh air flap volume of separating air
Krupp Polysius Corp.
Measures
Note Set negative pressure before separator to the point where dust is just prevented from emerging at the separator feed (1-2 mbar)
Take the fan capacity into account
Page 101
L:\DATA\Dept150\Polysius Presentation and Training\Polysius Training\Grinding\Ball Mill\bmill_sepol_mechanics.ppt 150 WEI, 140 CD
Nr.
Problem
1.
Finished material Feed material temperature too high too hot (danger of hemihydrate formation)
2.
Granulometric distribution is too flat
3.
Cause
Guide vane ring is opened too far Granulometric Excessive distribution is too steep tangential (water demand of setting of the cement possibly too guide vanes high)
Krupp Polysius Corp.
Measures
Note
- Feed in fresh air before separator (possibly install fresh-air-pipesockets) - Try increasing the mill’s aeration - Inject water into the mill - set guide vanes more tangentially
Sufficient dedusting is necessary (system fan and system filter must be sufficiently big)
- set guide vanes more radial - Throttle the circulating air fan or system fan (lower the separator efficiency)
In steps of 5, max 10
In steps of 5, max 10
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