用于能量回收的有机朗肯循环混合工质研究

发布时间：2019-01-20 13:58

【摘要】：近年来随着低温余热的利用越来越受到重视,将LNG冷能和低温余热联合应用的有机朗肯循环研究也受到了广泛的关注,其中循环工质的选择更是提高系统热力性能的关键。针对循环工质选择的问题,将R236ea、R245fa以及两者按不同质量分数配比得到的9种混合工质作为亚临界ORC工质,结合窄点分析方法计算了系统在2种最佳设计工况下的热力学性能及热经济性。结果表明:混合工质R236ea/R245fa(0.9/0.1)和R236ea/R245fa(0.8/0.2)分别是以最佳热和冷回收效率为设计工况标准时的最佳循环工质;2种工况下,混合工质的热经济性均优于纯工质;在混合工质中提高R236ea的比例可以有效降低换热面积,提高系统经济性。为日后将低温余热和LNG冷能联合应用的有机朗肯循环二元混合工质选择提供一定的参考。
[Abstract]:In recent years, more and more attention has been paid to the utilization of low temperature waste heat. The study of organic Rankine cycle which combines LNG cold energy with low temperature waste heat has been paid more and more attention, and the selection of circulating refrigerants is the key to improve the thermal performance of the system. In order to solve the problem of selection of circulating working fluids, R236eaFa R245fa and 9 kinds of mixed working fluids with different mass fractions were used as subcritical ORC working fluids. The thermodynamic performance and thermal economy of the system under two optimum design conditions are calculated by using the narrow point analysis method. The results show that R236ea/R245fa (0.9 / 0.1) and R236ea/R245fa (0.8 / 0.2) are the best cycle refrigerants with optimum heat and cold recovery efficiency as design conditions. Under the two conditions, the thermal economy of the mixed working fluid is better than that of the pure working fluid, and the increase of the proportion of R236ea in the mixed working fluid can effectively reduce the heat transfer area and improve the system economy. It provides a certain reference for the selection of organic Rankine cycle binary mixed working medium which is used in combination of low temperature waste heat and LNG cold energy in the future.
【作者单位】：辽宁石油化工大学石油天然气工程学院;辽宁石油化工大学化学化工与环境学部;中国石油大学(华东)储运与建筑工程学院;
【基金】：国家自然科学基金资助项目(51306210)
【分类号】：TB64;TK115

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