王怀信,刘建宇,任黎亚
AuthorsHTML:王怀信，刘建宇，任黎亚
AuthorsListE:Wang Huaixin,Liu Jianyu,Ren Liya
AuthorsHTMLE:Wang Huaixin，Liu Jianyu，Ren Liya
Unit:天津大学机械工程学院，天津 300350
Unit_EngLish:School of Mechanical Engineering，Tianjin University，Tianjin 300350，China
Abstract_Chinese:在中高温热源条件下，为避免工质热分解对有机朗肯循环(ORC)系统的安全和性能造成影响，循环温度的 取值上限不应高于工质的热稳定上限温度(tstable)．循环最高温度的取值对循环优化结果产生较大影响．本文在烟气 初温和质量流量分别为 510 ℃和 15.8 kg/s 的热源条件下，开展了回热 ORC 系统的循环参数优化和工质优选研 究．结果表明，若不考虑工质热分解问题，乙醇和丙酮系统的净输出功率最大．继而对乙醇和丙酮两种工质开展了 热稳定性实验测量研究，结合系统允许的工质分解速率上限(年分解量不超过 1%)，确定了两者的 tstable 分别为 172 ℃和 159 ℃；限制循环温度不超过 tstable，乙醇和丙酮系统的净输出功率明显降低，此时回热 ORC 系统的最优工 质为环戊烷．
Abstract_English:Under the condition of medium- to high-temperature heat source，to avoid the influence of the thermal decomposition of the working fluid on the safety and performance of the organic Rankine cycle(ORC)system，the upper limit temperature of the cycle should not be higher than the thermal stability temperature(tstable) of the working fluid. The upper limit of cycle temperature has considerable influence on the results of cycle parameter optimization. In this study，under the condition of flue gas heat source with the initial temperature of 510 ℃ and mass flow of 15.8 kg/s，the optimization of the working fluid and cycle parameters of the regenerative ORC system was investigated. Results show that the net output power of the ethanol and acetone system is the largest when the thermal decomposition of the working fluid is not considered. Then，the thermal stability of ethanol and acetone was measured. Combined with the upper limit of the allowable decomposition rate of the system(the annual decomposition amount is not more than 1%)，the thermal stability temperature of the two working fluids was determined to be 172 ℃ and 159 ℃. When the upper limit temperature of the power cycle is not more than the thermal stability temperature，the net output power of the ethanol and acetone system is obviously reduced，and cyclopentane is the optimal working fluid of the regenerative ORC system.
Keyword_Chinese:中高温热源；有机工质动力循环；上限温度；热稳定性；系统参数优化
Keywords_English:medium- to high-temperature heat source；organic working fluid power cycle；upper limit temperature； thermal stability；system parameter optimization

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