基于分液冷凝组分调控的非共沸ORC性能研究  

Performance investigation of zeotropic ORC based on Liquid-vapor separation condensation and composition-adjustable

作　　者：黄仁龙 钟天明 HUANG Renlong;ZHONG Tianming(Mechanic and Electronic Engineering,Guangdong University of Science and Technology,Dongguan 523668,China;Mechanic and Electronic Engineering,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China)

机构地区：[1]广东科技学院机电工程学院,广东东莞523668 [2]仲恺农业工程学院机电工程学院,广东广州510225

出　　处：《热科学与技术》2021年第6期578-585,共8页Journal of Thermal Science and Technology

基　　金：广东省自然科学基金资助项目(2018A030310026);2018年仲恺农业工程学院校内优秀人才专项资助项目(KA180530505);广东科技学院2020年度校级科研资助项目(GKY-2020KYYBK-14)。

摘　　要：低温余热广泛存在于地热和工业领域,开发和利用低温余热,有利于节能减排和保护环境。有机朗肯循环(organic Rankine cycle,ORC)是一种热电转换技术,能够有效地回收工业余热和开发地热能。当前ORC余热回收存在着效率不高、热-经济性低、变工况运行性能不理想等问题。基于ORC面临的问题,研究一种基于气液分离组分调控的新型LC-ORC循环系统,建立了LC-ORC系统的热力学模型,并对其进行性能分析和变工况运行研究。结果表明:利用分液冷凝组分调控技术后,与B-ORC系统相比,冷凝过程中的传热系数可提高6.43%,冷凝器换热面积降低6.45%,单位面积输出功可提高2.62%;同时,LC-ORC系统还能增强系统对冷热源波动的适应性,提高系统变工况运行性能,净输出功可提高2.02%。The low temperature waste heat is widely utilized in geothermal and industrial fields.It is beneficial to utilize the waste heat for energy conservation,emission reduction and environmental protection.Organic Rankine cycle is a heat-to-power technology.It can recover industrial waste heat and utilize geothermal energy effectively.However,low efficiency,poor operating performance under variable conditions and poor thermo-economy exist in the ORC recovering waste heat.Therefore,to build a novel LC-ORC system based on Liquid-vapor separation condensation and composition-adjustable.The thermodynamic model of LC-ORC model is formulated and the performance at variable conditions are investigated.The results indicate that for the LC-ORC system condensation heat transfer coefficient can be increased by 6.43%,condensation heat transfer area can be reduced by 6.45%,the ratio of the net power output to the total heat transfer area is increased by 2.62%at the same conditions compared with the B-ORC system.Meanwhile,LC-ORC can enhance the adaptability of the system to the fluctuation of cold and heat sources and improve the performance of the system under variable operating conditions.The net power output can be increased by 2.02%.

关 键 词：有机朗肯循环 非共沸工质 分液冷凝 组分调控 热力学 

分 类 号：TK123[动力工程及工程热物理—工程热物理]