非共沸混合工质ORC低温烟气余热利用分析与优化  

Recovery of waste heat of low-temperature flue gas by parametric optimization on organic Rankine cycle with non-azeotropic mixtures

作　　者：倪渊[1] 赵良举[1] 刘朝[1] 莫依璃[1] 

机构地区：[1]重庆大学动力工程学院、低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《化工学报》2013年第11期3985-3992,共8页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2011CB710701)~~

摘　　要：以低温烟气余热的优化利用为目标,采用R245fa、R601a以及两者作为组分的9种不同质量配比的二元非共沸混合物共11种物质作为亚临界ORC工质,利用热力学以及热经济学分析循环性能,合理设计ORC系统并优化相关参数。研究表明,采用最大效率下的参数作为系统设计工况整个ORC系统热力性能较优。系统设计工况下,循环工质采用R245fa/R601a(0.6/0.4)相比其他纯工质与混合工质的热力学综合性能更优。热经济性分析中R245fa/R601a(0.9/0.1)热经济性最优,但R245fa/R601a(0.6/0.4)热经济性与R245fa/R601a(0.9/0.1)相差无几。考虑到R245fa/R601a(0.6/0.4)优良的热力学性能,故R245fa/R601a(0.6/0.4)依然是系统设计时综合考虑采用的循环工质。在混合工质中提高R245fa的质量比能降低APR与LEC,提高系统经济性。To achieve the optimal use of the low-temperature waste heat,11 substances were adopted as the subcritical ORC working fluids,R245fa and R601a,as well as 9 non-azeotropic binary mixtures in different mass ratios.Thermodynamic and thermo-economic analyses ware employed to design a reasonable ORC system and optimize relevant parameters.The result shows that the ORC system presents better thermal performance with the parameters at the maximum exergy efficiency as the working conditions of system.Under the designed working conditions of system,R245fa/R601a of 0.6/0.4 makes the thermodynamic performance better while the ratio of 0.9/0.1 leads to the best thermo-economy.R245fa/R601a of 0.9/0.1 is little different from the ratio of 0.6/0.4 in the analysis of thermo-economy.Taking its excellent thermodynamic properties into account,the ratio of 0.6/0.4 should be considered as the working fluid when designing the system.Meanwhile,increase of the mass ratio of R245fa in the binary mixture reduces APR and LEC,improving the system economy.

关 键 词：非共沸混合工质 有机朗肯循环 效率 热经济性 

分 类 号：TK123[动力工程及工程热物理—工程热物理]