Q2 -7 DohaGasConf - Final

Qatar Liquified Gas Company Limited (II)

QG2, the Designs and Technologies for a 7.8 MTPA Train

March 10, 2009

2DELIVERING LNG TO THE WORLD

Agenda

• Overview Qatargas Site

• Overall Process Flow

• Key Technologies

• Conclusions


QG 2 On-Plots (By Development Phase)

Slug Catcher

Inlet Facilities

Utilities

Flares

SW / CW

Trains 4 & 5 Process


Qatargas Site

Qatargas

Trains 1,2&3(Existing)

Qatargas 2Trains 4 & 5

(New)


Qatargas 2 - Overall Process Flow Scheme

INLETFACILITY

OFFSHORE

PRODUCTIONACID GASREMOVAL

DEHYDRATIONMERCAPTAN

REMOVAL

NGLRECOVERY

LIQUEFACTION

REFRIGERATION(C3, MR, N2)

07

FRACTIONATIONC3, C4 TREATING

NITROGENREJECTION

SULFURRECOVERY

LNG

PROPANE

BUTANE

PLANTCONDENSATE

SULFUR

FIELDCONDENSATECONDENSATE

TREATING

TRAIN 4

TO TRAIN 5

ChilledSelexol


Acid Gas Removal Unit

• Design basis for Acid Gas Removal:– Feed gas flow rate ~ 1.5 Billion SCFD per train

– H2S: 2.0% 2 ppmv

– CO2: 3.6% 10 ppmv

– COS: 1 ppmv

• BASF aMDEA:

– Single absorber possible– Lowest energy consumption– Low hydrocarbon co-absorption

• Absorber size approaches limits for fabrication and handling– Vessel weight ~1450 tonnes– 6.8 m diameter, 188mm shell thickness


QG2 Train 4 - Amine Contactor


NGL Recovery Design to Make Lean LNG

• Ortloff SCORE(*) Process• Provides > 99% recovery of

propane. • Expander configuration: 3 x 50%

machines to handle flow and provide sparing for high reliability

• Lean Gas product is further recompressed before it enters the Liquefaction section

• Deethanizer functions as “Scrub Column” in conventional LNG design

• Higher mixed NGL recovery than with scrub column

• (*) SCORE = Single Column Overhead Recycle


Liquefaction Process Size Step-Out

• Evaluated train size increase using conventional liquefaction technologies

– Joint study with Air Products considered:

• Propane-Precooled Mixed Refrigerant Process

• Dual Mixed Refrigerant

• AP-X™ Hybrid Process

– Selected AP-X™ Hybrid Process

• Intensive technology qualification undertaken

– Identified all process and equipment aspects that were outside current experience base

– Developed and executed detailed qualifications to assess the new technologies

• Gas turbine driver options

• Large starter / helper / generator motors and variable frequency drives

• Large refrigerant compressors

• Nitrogen refrigeration circuit expander / compressors


AP-X™ Hybrid Process Overview

SWEETGAS DEHYDRATION

LNG

MAIN HEATEXCHANGER

NITROGEN REFRIGERATION

Expander / Compressor

E C

PROPANE CHILLER & SMALL EXPANDER

COLD BOX NITROGENCOMPRESSOR

SUBCOOLER

MIXED REFRIGERANT COMPRESSORS

PROPANE COMPRESSORS

NGLRECOVERY

PROPANE-PLUSTO FRACTIONATION

NitrogenRejection

FUEL

PRE-COOLING:

PROPANE SYSTEM

(Four Pressure Levels)


QG2 Train 4 - MCHE and LNG Sub-Cooler


Large Refrigeration Compressor Drivers

• Identified GE Frame 9E as refrigerant compressor drives – Lower unit cost of power– 3000 rpm speed is ideal for compressor design– Allowed one Frame 9E per refrigerant string– Large starter/helper motors / generators

• Required 45 MW (top at 60)• Large variable frequency drives

– Dry Low NOx (DLN) technology

• Waste heat used to generate high pressure steam to enhance plant thermal efficiency

• Steam turbine generators• Steam turbine drivers • Process heat


Refrigeration Configuration Overview

Frame 9E Propane

81 MW

MotorGenerator

86 MWFrame 9E Nitrogen

86 MW

MotorGenerator

MR Mixed Refrigerant

109 MW

Frame 9E

MotorGenerator

Frame 9EFrame 9E Propane

81 MW

MotorGeneratorMotorGenerator

86 MWFrame 9EFrame 9E Nitrogen

86 MW


MR Mixed Refrigerant

109 MW

Frame 9E

MotorGeneratorMR Mixed

Refrigerant

109 MW

Frame 9E

MotorGenerator Mixed

Refrigerant

109 MW

Frame 9EFrame 9E



MR and C3 Waste Heat Recovery Units


Sulfur Recovery

• Sulfur recovery regulations tightened at the time of QG2 approval to >99%

– Recovery must be met across full span of possible H2S concentrations

– Sulfur species removal includes H2S, COS and Mercaptans

• High sulfur recovery met through application of proven technologies

– H2S and COS removal using BASF-aMDEA (Lurgi)

– Mercaptan removal by molecular sieves (UOP)– Molecular sieve regeneration gas treating by chilled Selexol process

(UOP)– Sulfur Recovery Unit comprises:

• Acid Gas Enrichment (ExxonMobil Flexsorb SE-Plus)• Claus Conversion (2-Stage Catalytic, with Lurgi Multi-Purpose

Burner)• Tail Gas Treating (ExxonMobil Flexsorb SE-Plus)


Conclusions

• QG2 onshore project has achieved a step function increase in LNG train liquefaction capacity through the use of new technologies

• The application of new technologies has been made possible through extensive internal qualification processes working closely with vendors

• The QG2 LNG plant will be the first application of the AP-X™ technology

• First application of GE Frame 9 turbines in mechanical drive for LNG service and use of combined cycle cogeneration service to achieve a high thermally efficient LNG plant

• The QG2 LNG plant is designed to meet very stringent environmental emissions standards for NOx and Sulfur recovery set forth by the state of Qatar

Q2 -7 DohaGasConf - Final

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