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1、第38卷第4期煤炭科学技术Vol38No42010年4月CoalScienceandTechnologyApr.2010煤焦与水蒸气气化反应热力学分析谢继东,徐振刚,姜英(煤炭科学研究总院北京煤化工研究分院,北京100013)摘要:为研究煤气化反应的热力学过程,以煤气化反应中最重要的煤焦与水蒸气反应过程为研究对象,对反应热效应、吉布斯自由能、平衡常数、平衡转化率进行了分析,得出温度、压力、水碳比(物质的量之比)3个参数对气化反应的影响规律。结果表明:随着气化温度的提高,平衡转化率增加,供给气化反应体系的总热量增加,原料显热大量增加;而压力的提高使平衡转化率降低,供
2、给气化反应体系的总热量增加,说明压力增加对提高煤的转化率不利;水碳比增大导致平衡转化率提高,供给气化反应体系的总热量增加,其原因是水碳比增大使化学反应热、原料显热大量增加,虽然转化率随着水碳比增大得以提高,但热损失增加。关键词:煤焦;气化;水蒸气;热效应;热力学中图分类号:TQ541文献标志码:A文章编号:0253-2336(2010)04-0124-05ThermodynamicsAnalysisonGasificationReactionofCoalCokeandSteamXIEJ-idong,XUZhen-gang,JIANGYing(BeijingResearchI
3、nstituteofCoalChemistry,ChinaCoalResearchInstitute,Beijing100013,China)Abstract:Inordertoresearchthethermodynamicsprocessingofthecoalgasificationreaction,takingthemostimportantcoalcokeandsteamreactionprocessinginthegasificationreactionastheresearchobject,ananalysisonthereactionthermaleffect,Gib
4、bsfreeenergy,equilibriumconstantsandequilibriumconversionratiowasconducted.Theinfluencelawofthetemperature,pressureandwatercarbonparameterstothegasificationreactionwasobtained.Theresultsshowedthatwiththegasificationtemperatureincreasedandtheequilibr-iumconversionrateincreased,thetotalthermalvalu
5、esuppliedtothegasificationreactionsystemwouldbeincreasedandthesensibleheatofthelawmaterialwashighlyincreased.However,thepressureincreasedwouldmaketheequilibriumconversionratereduced,thetotalthermalvaluesuppliedtothegasificationreactionsystemwouldbeincreasedandthusthepressureincreasedwouldbenotfa
6、vorabletoim-provethecoalconversionrate.Thewaterandcarbonratioincreasedwouldcausetheequilibriumconversionrateincreasedandcausethetotalthermalvalueincreasedsuppliedtothegasificationreactionsystem.Thereasonwasthatwaterandcarbonrateincreasedcouldcausethechemicalreactionheatandthematerialsensibleheat
7、highlyincreased,althoughtheconversionratecouldbeimprovedwiththewaterandcarbonrateincreased,theheatlossincreased.Keywords:coalcoke;gasification;steam;thermaleffect;thermodynamics煤气化已成为洁净、高效利用煤炭的最主要途应可能达到的各种极限值。本文以气化过程中最重径之一
