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本文首先介绍了一种有机朗肯循环(ORC)的工质筛选过程,即针对工质的环保特性、循环热效率及净输出功等选出了14种综合性能较好的工质。然后,针对所选工质,采用模拟退火算法对基本有机朗肯循环(BORC)和内回热有机朗肯循环(ORCIH)性能进行了优化计算,对比了两种循环在最佳工况下的热力学性能,并分析了变热源温度对BORC热力学性能的影响。结果显示,对于各所选工质,ORCIH的热效率与(火用)效率相对于BORC分别提高了0.80%~3.34%和3.20%~10.22%,而BORC热效率、工质质量流量和循环净输出功均随着热源温度的升高而增大。在所选非制冷工质中benzene循环性能最好,制冷工质中R245ca与R245fa综合性能最好。
In this paper, we first introduce a working-process screening process of organic Rankine cycle (ORC), that is, select 14 kinds of working fluids with good overall performance according to the environmental characteristics of working fluid, thermal efficiency of circulation and net output work. Then, for the selected working fluid, simulated annealing algorithm was used to optimize the performance of the organic organic Rankine cycle (BORC) and internal recirculation Organic Rankine cycle (ORCIH). The comparison between the two cycles under the best conditions The influence of temperature of heat source on the thermodynamic properties of BORC was analyzed. The results show that for each selected working medium, the thermal efficiency and exergy efficiency of ORCIH increase by 0.80% -3.34% and 3.20% -10.22%, respectively, compared with BORC, while the BORC thermal efficiency, working fluid mass flow rate and circulating net output work Both increase with the heat source temperature. In the selected non-refrigerated benzene cycle performance is best, the refrigerant in the R245ca and R245fa overall performance of the best.