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Natural Gas Liquefaction - Personal webpages at …

1 Classification: Internal Status: DraftNatural Gas LiquefactionTEP 10 Gas Processing and LNG Fall 2008 Jostein Pettersen2 Simplified LNG plant block diagramEndflashHHCE xtractionCH4/N2 FuelgasPower&heat23 Hammerfest LNG plant - block flow diagramSlugcatcherInlet facilities/MeteringCO2removalDe-hydratio nMercuryremovalNatural gasliquefactionLPG StorageCondensateStorageMEGR ecoveryCondensatetreatmentCO2dryingandre compressionNitrogenremovalFractionation( RefrigerantMake-up)Fuel gassystemC1/ C2/ C3 Refrig. Make-upCO2reinjection(to pipeline)Feed frompipelineLean MEG(to pipeline)LNGS torageLNGS torageN2to conditioning (pre-treatment) Acid Gas (CO2and H2S) removal Acid gas causes corrosion, reduces heating value, and may freeze and create solids in cryogenic process Typical requirements for LNG: Max 50 ppmv CO2, Max 4 ppmv H2S(ppmv - parts per million by volume) Dehydration (water removal) Water will freeze in cryogenic process Typical requirement: Max 1 ppmw (weight) H2O Mercury removal Mercury can cause corrosion problems, especially in aluminium heat exchangers Requirement: Max g/Nm335 Gas quality constraints for gas liquefactionSource: Advantica6 Natural gas and LNG compositionDesign data for Hammerfest LNG plant ComponentSlug catcherLiquefaction plantLNGN itrogen2,512,671,10 Methane80,0286,3491,92 Ethane4,976,545,59 Propane2,502,681,11 Butane1,221,230,23 Pentane0,580,350,04C6+1,620,150 Ar

2 3 Hammerfest LNG plant - block flow diagram Slug catcher Inlet facilities/ Metering CO2 removal De-hydration Mercury removal Natural gas liquefaction LPG Storage

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