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Propane Precooling Cycles for increased LNG train capacity. Henri Paradowski , Mohamed Ould Bamba and Christian Bladanet Process Division Technip France LNG 14 Conference , March 2004 Doha , Qatar. Propane Precooling cycles for increased LNG capacity. Introduction

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propane precooling cycles for increased lng train capacity

Propane Precooling Cycles for increased LNG train capacity

Henri Paradowski ,

Mohamed Ould Bamba and Christian Bladanet

Process Division Technip France

LNG 14 Conference , March 2004

Doha , Qatar

propane precooling cycles for increased lng capacity
Propane Precooling cycles for increased LNG capacity

Introduction

  • LNG faces rapid market growth
  • Today train size is 5 Mtpa of LNG in rundown line
  • Should this capacity be increased to 6 , 8 or 12 Mtpa?
  • Is the C3-MR process the most appropriate?
propane precooling cycles for increased lng train capacity4
Propane Precooling cycles for increased LNG train capacity
  • The C3-MR is robust, efficient and economic
  • The process invented by APCI has a leading position.
  • The main challenge is the propane compressor design.
  • Is it possible to reach 6 Mtpa , 8 Mtpa or more with proven process and equipment ?
basis of study for parametric study
Basis of study for parametric study
  • Qatar North Field natural gas composition N2 4.0 %mol

C1 87.5 C2 5.5 C3 2.1 C4 0.8 C5 0.1 (No NGL production)

  • Cooling Water: 29°C
  • NG flow in MCHE: 0.8 BSCFD
selected turbines and compressors for base case
Selected turbines and compressors for base case

Drivers Available gas turbine site power

GE 7 EA 3600 RPM 74 MW

GE 9 3000 RPM 106 MW

Additional power from helper 9 MW

Propane compressor

Max. flow coefficient 0.14

Max. volume flow 170 000 Am3/h at impeller eye at 3600 RPM

parametric study to optimize the propane compressor
Parametric study to optimize the propane compressor
  • MR composition
  • Precooling temperature
  • MR vaporisation pressure
  • MCHE outlet temperature

Selected parameters

technip total nitrogen removal process to increase lng
Technip Total Nitrogen removal Process : to increase LNG

LNG FROM

MCHE: 0.8 BSCFD

+4.8 %

+ 6.2 %

DRY NG

CW

NRU

RECYCLED

GAS

GE

D

NRU GAS

TO FUEL

30 bars

LNG TO

STORAGE: 5.74 MTPA

effect of c1 content in mr
Effect of C1 content in MR

Precooling at –34°C , MR vaporization at 4.2 bars

effect of propane precooling temperature
Effect of Propane precooling temperature

C1 in MR 44.5% , MR vaporization pressure 4.2 bars

effect of mr vaporization pressure
Effect of MR vaporization pressure

Precooling at –31°C , MR C1 44.5 to 45.5%

effect of mche outlet temperature
Effect of MCHE outlet temperature

Precooling at –31°C, MR : vaporization at 4.4 bars , 45% C1

optimized lng train with 2 ge 7
Optimized LNG train with 2 GE 7

Selected parameters for C3-MR process

  • Methane content in MR 45%
  • Propane precooling temperature –31°C
  • MR vaporization pressure 4.4 bars
  • LNG at MCHE outlet temperature –148°C
  • LNG production 5.7 Mtpa in run-down line (5.5 Mtpa in storage)
8 mtpa lng train using c3 mr and ge 7 s
8 Mtpa LNG train using C3-MR and GE 7’s

How to design an 8 Mtpa LNG train using GE 7’s ?

  • 3 GE Frame 7 are required

How to design the propane cycle of this 8 Mtpa train

using The C3-MR process ?

  • Two line-ups of refrigerant compressors are possible.
line up 1 2 c3 lp mr compressors 1 hp mr compressor
Line up 1 : 2 // C3-LP MR compressors + 1 HP MR compressor

CW

CW

GT

LLP

PR

HP

PR

LP

MR

LP

PR

MP

PR

GT

CW

HP MR

TO CHILLERS

ASC

GT

LLP

PR

LP

MR

HP

PR

LP

PR

MP

PR

8 Mtpa LNG train with 3 GE7

8 mtpa lng train c3 mr first line up of compressors
8 Mtpa LNG train : C3-MR first line up of compressors
  • 2 C3-LP MR compressors in parallel
  • 1 HP MR compressor
  • From 5.5 to 8 Mtpa the capacity is multiplied by 1.5
  • The volume flow of the C3 compressor is multiplied by 0.75
  • All volume flow rates are below 170 000 m3/h
  • All flow coefficients are lower than 0.10
line up 2 2 mr compressors 1 c3 compressor in 2 casings
Line up 2 : 2// MR compressors + 1 C3 compressor in 2 casings

GT

CW

MR HHP

MR LP

GT

MR LP

KA

CW

GE7

KB

CW

C3 LIQUID

HP

C3

MP

C3

LLP

C3

LP

C3

8 Mtpa LNG train with 3 GE7

conclusions on the 8 mtpa lng train with 3 ge7
Conclusions on the 8 Mtpa LNG train with 3 GE7

8 Mtpa C3-MR train is feasible and economic

2 possibilities for compressors :

  • 2 LP MR - propane compressors in parallel and a HP MR compressor
        • Proven equipment , flexible
  • 2 MR compressors in parallel and a 2 casing propane compressor
        • Less costly
capacity increase of an existing c3 mr lng train
Capacity increase of an existing C3-MR LNG train

Strategy

  • Target : 30% capacity increase
  • No modifications to kettles, drums, columns, C3 condensers
  • Modification of internals
  • Modification of compressors
lng debottlenecking propane precooling capacity increase
LNG debottlenecking : Propane Precooling capacity increase

HP MR

HHP C3

CW

M

5B

5B

5B

CW

CW

CW

LP

MR

LLP C3

HP C3

LP C3

MP C3

Compressor line up before modification 67 MW

lng debottlenecking propane precooling capacity increase22
LNG debottlenecking : Propane Precooling capacity increase

HP MR

HHP C3

CW

5B

5B

5D

5D

CW

CW

CW

LP

MR

LLP C3

MP C3

LP C3

HP C3

Compressor line up after modification : 93 MW

New

New

5B

5B

5D

5B

5D

lng debottlenecking propane precooling capacity increase23
LNG debottlenecking : Propane Precooling capacity increase

Main modifications to compression :

Total power increase from 67 to 93 MW : + 26 MW

MR compressor turbines : GE5B modified to 5D : +11 MW

Propane power : +15 MW

New main Propane compressor rotating at 3600 RPM driven by GE5B ( gear box )

New Propane booster compressor driven by GE5B

lng debottlenecking propane precooling capacity increase24
LNG debottlenecking : Propane Precooling capacity increase

Concluding remarks :

Modification of propane compression is necessary

Increase of hydraulic and thermal capacity of some equipment

  • High efficiency internals in suction drums
  • High efficiency Wieland tubes in kettles

Possible additional savings

  • Addition of an economizer and creation of a 5th stage on propane compression
propane precooling cycles for increased lng train capacity25
Propane Precooling Cycles for increased LNG train capacity

Conclusions from the studies

The C3-MR process can be easily debottlenecked

The C3-MR process can be easily designed for a 5.5 Mtpa LNG train using 2 GE7

The C3-MR process can also be designed for a 8 Mtpa LNG train using 3 proven GE7 or 2 GE9

Future Train

Is it necessary to increase the train size to 11 Mtpa by using 4 GE7 or 3 GE9 ?

propane precooling cycles for increased lng train capacity26
Propane Precooling Cycles for Increased LNG train capacity

Epilogue

The propane cycle is not a limitation to LNG train size

The C3-MR process can be used for large trains

8 Mtpa seems to be a good target for the next generation of LNG trains

Thank you for your attention

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