变负载有机朗肯循环系统实验研究  

Performance Investigation of an Organic Rankine Cycle System under Variable Load Operation

作　　者：刘广林[1] 曹泷 徐进良[1] LIU Guang-Lin;CAO Shuang;XU Jin-Liang(Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy,North China Electric Power University,Beijing 102206,China;School of Energy and Power Engineering,Zhengzhou University of Light Industry,Zhengzhou 100084,China)

机构地区：[1]华北电力大学低品位能源多相流与传热北京市重点实验室,北京102206 [2]郑州轻工业大学能源与动力工程学院,郑州450002

出　　处：《工程热物理学报》2020年第5期1081-1086,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金国际合作项目(No.51210011);郑州轻工业大学博士科研基金(No.13501050022)。

摘　　要：电力供给侧面临热源高效利用和电网侧波峰波谷对电厂变负荷运行的要求,本文针对发电系统变负荷运行工况,在实验热源功率及温度分别为100 kW和110℃下,研究负载和膨胀机转速变化时,有机朗肯循环发电系统净效率及部件实际运行特性的变化规律。主要结论为:系统净效率随着负载功率和膨胀机转速的增大而增大,当负载为6 kW和膨胀机转速为3000 r/min时,系统发电净效率最大,为4.8%。膨胀比和工质泵等熵效率随负载功率和转速的增加而增大,膨胀机入口处过热度的变化规律与之相反;当系统效率最大时,膨胀机膨胀比、等熵效率与入口过热度分别为4.4、53.5%及8.8℃。Mismatching of power supply and consumption between power plant and electric grid is a key issue in power generation.In this study,the performance of low-grade organic Rankine cycle(ORC)power generation system under various loads was investigated.The thermal power and temperature of heat source are 100 kW and 110℃,respectively.The net efficiency of system as well as the parameters of pump and expander are traced by tuning the load and rotating speed of expander.The results show that the net efficiency of power system increases with the increase of load power and expander speed.The system has the optimized net efficiency of 4.8%at the load of 6 kW and expander speed of 3000 r/min.The expansion ratio of expander as well as the isentropic efficiency of working fluid pump also increase with the increasing load power and expander speed,whereas the superheat at the expander inlet reduces.When the system efficiency reaches maximum value,expansion ratio,isentropic efficiency and superheat degree of the expander are 4.4,53.5%and 8.8℃,respectively.

关 键 词：有机朗肯循环 变负载运行 工质 系统集成 

分 类 号：TK123[动力工程及工程热物理—工程热物理]