Dehydrationteg Unit

DGEP Job : Service :

Unit : Date : GLYCOL (TEG) DEHYDRATION UNIT CHARACTERISTICS Unit

Rev.:

Yadana

Tunu north

Timimoun

Alwyn

GAS CHARACTERISTICS at absorber inlet Minimun pressure

bar abs

Maximun temperature

°C

Maximun gas flowrate (1 Sm3=35,383 SCF)

10^6 SCFD

Maximun gas flowrate

10^6 Sm3/day

105.5

66

68.5

49

45

32

80 60

495.36

495.36

318.44

106.15

14

14

9

3

-11

WATER DEW POINT REQUIRED Water dew temperature required

°C

-4.2

10

Reference pressures

bar abs

105

66

68

Dry gas water content

kg/10^3 Sm3

0.0642

0.219

0.055

Dry gas water content

lb/10^6 Scuft

4.00

13.65

3.43

kg/10^3 Sm3

1.25

1.6

0.72

1

-9.2

5

-16

-5

AMOUNT OF WATER TO BE REMOVED Maximun water content of inlet gas (Fig.IV-A1) Wi Design water dew temp. of dry gas ( dew temp.required - 5°C ) Maxi water content of dry gas ( Fig. IV-A1)

Wo

Amount of water to be removed by TEG unit

kg/10^3 Sm3

0.046

0.16

0.04

0.05

kg/h

772.57

840.00

255.00

118.75

(With the margin of 10% recommended in SPEC GS ECP 101) Minimun lean TEG concentration Equilibrium water dew temp. (design water dew temp.-10 °C) Minimun lean TEG concentration (Fig.VII-B2)

C

Activity coefficient

Gamma

( Fig.VII-B3)

°C

-19.2

-5

-26

-15

%w

99.65

98.8

99.55

99.55

0.617

0.667

0.63

0.57

Main process parameters of the absorption Lean TEG concentration adopted (range : 98,8 - 99,9)

C

99.7

98.85

99.8

99.5

Activity coefficient correspondent

Gamma

0.617

0.667

0.58

0.59

r ( kg/kg )

27

24

35.4

28

23.63

22.20

27.28

25.00

(Fig. VII-B3)

Lean TEG / removed water ratio adopted

%w

Minimun specified by SPEC GS ECP 101( Average value:27,5 kg/kg ; range:15 - 35 ) Number of theoritical plates for the absorber adopted Absorption factor calculated

n A R

2.2

2

1.5

2

5.16

4.21

7.01

5.60

329.66

86.08

504.38

194.19

%w

99.70

98.85

99.80

99.49

Lean TEG circulation rate

kg/hour

18963

20160

9027

3325

Lean TEG density

kg/liter

1.1

1.105

1.115

1.1

liters/hour

17239

18244

8096

3023

%w

96.14

94.90

97.06

96.06

1

1

1

1

14

0

22

22

Lean TEG concentration calculated

C

( C adopted is modified untill its value is equal to the C calculated)

Glycol (TEG) unit Process characteristics

Lean TEG circulation rate Minimun rich TEG concentration

c

Number of theoritical plates for the stripping column (usual max =1) Stripping gas flowrate

( Fig.VII -B6)

Stripping gas flowrate

Sm3/m3 TEG Sm3/hour

241

0

178

67

1970.00

1857.50

2285.00

2007.50

10^6 kcal/h

1.52

1.56

0.58

0.24

10^6 kcal/h

1.85

1.96

0.87

0.32

Reboiler minimun heat duty (SPEC GS ECP 101)

kcal/kg

Reboiler minimun heat duty (SPEC GS ECP 101) Reboiler installed heat load ( oversizing included )

MAIN EQUIPMENT SIZING AB SORB ER Gas density @ drying process conditions

kg/m3

87.20

62.90

73.00

63.00

kg/kmol

20.28

20.28

20.64

18.00

Absorber diameter with bubble caps plates (with an over design of 10%)

m

3.69

3.98

3.10

1.74

Absorber diameter with structured packing

m

2.84

3.06

2.39

1.34

m/hour

2.71

2.47

1.81

2.15

Gas molar mass

Glycol flowrate with structured packing ( mini = 1m/h )

Timimoun

50

0.64

275000

0.55