有机朗肯循环与蒸汽压缩制冷循环耦合系统联产性能研究.docx

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有机朗肯循环与蒸汽压缩制冷循环耦合系统联产性能研究

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李太禄贾亚楠孟楠刘青华秦浩森孔祥飞

摘要以中高温地热作为驱动热源，将有机朗肯循环与蒸汽压缩制冷循环相结合，提出了中高温地热冷热电联产系统。基于热力学第一和第二定律，构建了冷热电联产热力学优化模型，并对热源温度120～200℃范围内的系统性能进行了模拟计算和分析，比较了Cyclohexane、Pentane、n-Heptane、n-Octane、n-Nonane、n-Decane、n-Hexane及Isopentane8种不同工质的热力学性能。结论显示：有机朗肯循环与蒸汽压缩制冷循环耦合系统可以实现冷热电联产，根据季节需求不同灵活调控;Isopentane发电性能最佳，Isopentane制冷性能最佳;回收冷却水排放的热量可以大大提高耦合系统热效率，热效率高达90%多。

关键词冷热电联产;有机朗肯循环;蒸汽压缩制冷循环;冷凝热回收;中低温地热

TM616???文献标志码A

OntheperformanceofcouplingcogenerationsystemoforganicRankinecycleandvaporcompressionrefrigerationcycle

LITailu，JIAYanan，MENGNan，LIUQinghua，QINHaosen，KONGXiangfei

（SchoolofEnergyandEnvironmentalEngineering，HebeiUniversityofTechnology，Tianjin300130，China）

AbstractThemediumandhightemperaturegeothermalenergyisusedasthedrivingheatsource，andtheorganicRankinecycleandthesteamcompressionrefrigerationcyclearecombinedtoputforwardtheCogenerationsystem.Basedonthefirstandsecondlawsofthermodynamics，athermodynamicoptimizationmodelofCCHPisestablished，andtheperformanceofthesysteminthetemperaturerangeof120–200℃issimulatedandanalyzed.Thethermodynamicperformanceofeightdifferentrefrigerants，cyclohexane，pentane，n-heptane，n-octane，n-nonane，n-decane，n-hexaneandisoopentanearecompared.Theconclusionshowsthat：thecouplingsystemoforganicRankinecycleandsteamcompressionrefrigerationcyclecanrealizethecombinedcoolingandheatingpowergeneration，whichcanbeflexiblycontrolledaccordingtotheseasonaldemand;thepowergenerationperformanceofisopentaneisthebest，andtherefrigerationperformanceofisopentaneisthebest;thethermalefficiencyofthecouplingsystemcanbegreatlyimproved（morethan90%）byrecoveringtheheatdischargedfromthecoolingwater.

KeywordsCCHP;organicrankinecycle;vaporcompressionrefrigerationcycle;condensationheatrecovery;systemoptimization

0引言

20世紀，世界能源消费迅速增长，预计今后几