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Doha conference
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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
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QG 2 On-Plots (By Development Phase)
Slug Catcher
Inlet Facilities
Utilities
Flares
SW / CW
Trains 4 & 5 Process
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Qatargas Site
Qatargas
Trains 1,2&3(Existing)
Qatargas 2Trains 4 & 5
(New)
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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
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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
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QG2 Train 4 - Amine Contactor
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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
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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
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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)
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QG2 Train 4 - MCHE and LNG Sub-Cooler
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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
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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
MotorGeneratorMotorGenerator
MR Mixed Refrigerant
109 MW
Frame 9E
MotorGeneratorMR Mixed
Refrigerant
109 MW
Frame 9E
MotorGenerator Mixed
Refrigerant
109 MW
Frame 9EFrame 9E
MotorGeneratorMotorGenerator
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MR and C3 Waste Heat Recovery Units
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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)
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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