针对有机朗肯循环（ORC）中传热过程对循环性能的影响,该文提出一种既相似但又区别于混合工质,各工质独立运行的叠合式有机朗肯循环（AORC）。AORC中,各工质进行串/并联的叠合换热,可形成类似于非共沸混合工质的温度滑移。由于各工质独立运行,使得叠合工质的温度滑移量可进行调节,以减小与外界热/冷源的传热温差,提高传热匹配性以及循环性能。以两种工质叠合的AORC为例进行循环性能分析,并与常规ORC进行对比。结果表明,AORC并不是各工质基本ORC的简单线性叠加,而是一种优化叠加。相比常规ORC,AORC的净输出功率最大可提升34.48%。但当热源温度高于高温工质的热源转折温度时,AORC趋近于高温工质的基本ORC。
Abstract
On account of the influence of the heat transfer processes on cycle performance in organic Rankine cycle （ORC）, an addition organic Rankine cycle （AORC） is proposed in this paper, which is similar to but different from the ORC with non-azeotropic mixtures, and can operate independently for each working fluid. In AORC, the stacking heat transfer processes with series or parallel by the working fluids can form effect of temperature glide similar to the non-azeotropic mixtures. Due to the independent operation of each working fluid, the temperature glide can be adjusted to reduce the heat transfer temperature difference with external heat/cold sources, thus improve the heat transfer matching, and improve the performance of the AORC. The thermodynamic performance of AORC consisted of two working fluids as example is analyzed and compared with the conventional ORC. Results shown that AORC is not a simple linear superposition of basic ORCs of various working fluids, but a optimal superposition. Compared with the conventional ORC, a maximum increase of the net output power of AORC can be reached 34.48%. But when the heat source temperature is higher than the shift-temperature of the high-temperature cycle of the working fluid, the AORC will tend to approach the basic ORC of the same working fluid.
关键词
有机朗肯循环 /
非共沸混合工质 /
传热匹配 /
叠合循环 /
工质热源转折温度
Key words
organic Rankine cycle /
non-azeotropic mixtures /
heat transfer matching /
addition cycle /
shift-temperature of heating fluid for working fluid
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基金
国家重点研发计划（2021YFE0108400）
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