TEG Contactor de-bottlenecking Basis for Design
The TEG system will be debottleneck and increase its process capacity from 380
MMscfd to 550 MMscfd.
The TEG system is currently designed to handle up to 350 MMscfd (with a 90% column
loading factor) at 72 barg and 19°C, and can manage a maximum feed rate of 380
MMscfd at 72 barg and 38°C.
TEG Contactor Design Basis
The TEG contactor internals are supplied by Sulzer with the following internals
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Glycol Inlet Distributor
Packing Top Retention Grid
Packing Bottom support Grid
Gas inlet Schipentoeter for 447 mm ID Nozzle
Gas Distribution (Chimney Tray)
Structured packing , Mellapack 250Y. height 4620 mm
Absorber Demister (supplied by Knitmesh Ltd)
The TEG contactor internals were design based on the below composition and
properties
1. Inlet Gas
Pressure
61
Bar abs
Temperature
23.4 to 37
°C
Gas Flowrate
330
MMscfd
Water Content
Saturated
0.00135
2. Composition at Contactor Inlet
Component
Mole % (Dry basis)
Methane
98.82
Ethane
0.48
Propane
0.05
i-Butane
0.02
n-Butane
0.03
Mole Fraction
i-Pentane
0.03
n-Pentane
0.02
n-Hexane
0.06
C7
0.03
C8+
0.03
Nitrogen
0.11
Carbon Dioxide
0.32
3. Lean T.E.G
Case
Minimum Pressure
Flowrate
5.5
m3/hr
Temperature
43.3
°C
Composition
99
wt%
Maximum water content in outlet gas
5.45 lb / MMscf
( Based on Parrish Equilibrium Data )
TEG Contactor Debottleneck Design Basis
For Debottleneck project, the TEG contactor will be optimize to handle the following
composition, properties and conditions.
1. Gas condition @ TEG Contactor inlet:
Max. IMA arrival
Temp.
Min. IMA arrival
Temp.
73.5
73.5
Bar abs
Temperature 31
23
°C
Gas
Flowrate
537
MMscfd
Pressure
537
Water
Content
@ 31 oC and 73.5
bara = 648.9mg /
std. m3
@ 23 oC and 73.5
bara = 420.8mg /
std. m3
2. Composition of the Wet gas at the inlet of the TEG contactor.
Max. Temp.
Min. Temp
Component
Mole fraction
Mole fraction
N2
0.001083933
0.0010843
CO2
0.002535945
0.002536685
METHANE
0.987482573
0.98780222
ETHANE
0.002935712
0.00293644
PROPANE
0.00150482
0.001504925
IBUTANE
0.000862819
0.000862686
BUTANE
0.000738753
0.000738727
IPENTANE
0.000521256
0.000521062
PENTANE
0.000421538
0.000421446
HEXANE
0.000263454
0.000263598
HEPTANE
0.000409436
0.000409758
OCTANE
0
0
NONANE
0
0
DECANE
0
0
NC11
0
0
NC12
0
0
NC13
0
0
NC14
0
0
H2O
0.000851655
0.000552267
C6_PSEUDO
6.92807E-05
6.86525E-05
C7_PSEUDO
0.000135451
0.000132708
C8_PSEUDO
6.45457E-05
6.16884E-05
C9_PSEUDO
5.90104E-05
5.3911E-05
C10_PSEUDO 5.14576E-05
4.41592E-05
C11_PSEUDO 8.36104E-06
4.76836E-06
Pseudo component properties
Pseudo
Molecular Weight
Components (kg/kgmole)
Standard Liquid
Density kg/bbl
C6+
84.87
109.701
C7+
97.67
113.835
C8+
112.1800003
116.219
C9+
126.1399994
117.968
C10+
138.8699951
118.604
C11+
218
119.24
3. Required water content @ Export
The target water content of export gas
is
Dew Point = 5°C @ 90 barg (112 mg
H2O/std. m3)
However, to meet the specified outlet requirements, a revamp of the TEG contactor
is necessary, which includes the following modifications:

New Inlet device which has to cope with new loadings but has to fit existing
nozzle.

We would keep the existing chimney tray and support grid for structured
packing

New structured packing replacing the existing one but able to cope with new
loadings.
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New liquid distributor

New demister section able to separate gas / liquid even at these high flows