基于能量梯级利用理论的煤基液体燃料—动力多联产系统集成与优化研究-research on integration and optimization of coal-based liquid fuel-power polygeneration system based on energy cascade utilization theory.docx

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基于能量梯级利用理论的煤基液体燃料—动力多联产系统集成与优化研究-research on integration and optimization of coal-based liquid fuel-power polygeneration system based on energy cascade utilization theory.docx

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基于能量梯级利用理论的煤基液体燃料—动力多联产系统集成与优化研究-research on integration and optimization of coal-based liquid fuel-power polygeneration system based on energy cascade utilization theory

AbstractFossilfuels,whichwererichincoal,poorinoilandlittleinnaturegas,hadbeenregardedasthemajorChina’senergyresources.Basedonthissituation,theoveralloptimizationfortheprocessofcoalconversionandtransfer,frommaterialtoenergy,wasneeded.Fromaperspectiveoffeasibilitystudy,thesystemofcoal-basedchemical-powerpolygenerationmadeitrealityfortheutilizationofcoalinawayofhigh-efficiencyandlow-carbon.Itwasalsoaway,what’simportant,tosolvethecompatibleandcoordinativedevelopmentamongenergyshortages,environmentalpollutionandsocialbenefits.Theintegrationofpolygenerationsystemfollowsthecascadeutilizationtheoryofchemicalenergyandphysicalenergy,alongwiththekeysofenergy-savingpotentialandessentialregularitycouldbeenactuallyreflectedbytheprocessofmaterialconversionandenergytransfer.Themodelofpolygenerationsystem,whichinvolvedchemicalfieldandpowergenerationfield,wasestablishedwiththebasicidea:theGSPcoalgasificationasthesourceprocessofsystem,thesystemsofFischer-TropschSynthesis(FTS)andIntegratedGasificationCombinedCycle(IGCC)wererationallymergedinordertointegratethepolygenerationsystemofcoal-basedFTsyncrudeandIGCC.Thissystemmostlyinclude:airseparationunit(ASU),GSPcoalgasificationunit(GSP),watergasshiftunit(WGS),rectisolunit,FTSunit,refiningunit,Claussulfurrecoveryunit(CSR)andthepowergenerationofcombinedcycleunit(PGCC).ThroughthesoftwareofAspenPlus,thesubsystemsweremodeledandsimulated.Thestudyonthesystemintegrationemphasizedonthethermodynamicpoint,whichisbasedonthecascadeutilizationtheoryofchemicalenergyandphysicalenergy,andestablishedtheexergyefficiencyastheoptimizationobjectivefunction.Thevalueofexergyefficiencydeterminesthesystemdegreeofthermodynamicperfectionastheperformanceindicatorofactualprocess,andtheanalysisoflocalsystem,especiallythesizeanddistributionofexergyloss,isthekeytoindicatetheenergy-savingpotential.TheresultsrevealedthatastheproportionofsyngasusedtoFTSwasincreased,theefficiencyofenergyutilizationwasgraduallyenhanced,anditcouldbeillustratedbytheexergyefficiencyofpolygenerati