摘要
我国的余热资源和可再生能源丰富,但部分余热资源和可再生能源分布比较分散,并存在温度和能量密度均较低的问题。基于传统能源转化技术,利用温度较低的余热资源和能量密度较低的可再生能源进行发电,会降低余热资源和可再生能源的热功转换效率。有机朗肯循环(ORC)系统可以有效利用低温热能进行发电。对于不同温度和形式的热源,采用合适的工质和循环工况,可以提高ORC系统的发电效率。有出口温度限制的热源是一种较为常见的热源形式,在ORC系统中增加回热装置可能会进一步提高热力循环对该类热源的利用效率。因此,文章针对有温度出口限制的热源,建立了亚临界ORC计算分析模型,选取了干流体和等熵流体作为循环工质,以热源回收㶲效率作为ORC系统的循环性能评价指标,系统地比较了不同回热度条件下ORC系统的循环性能。文章系统地分析了回热流程对ORC系统循环性能的影响规律,并将计算结果进行理论关联,首次建立了依据冷源和热源条件直接选取最佳回热度的定量准则。
China is rich in waste heat and renewable energy, but part of the waste heat and renewable energy are dispersed, in low temperature and in low energy density. The application of traditional energy conversion technology on converting the low temperature waste heat and renewable energy into electricity results in low heat-power conversion efficiency. Using organic Rankine cycle(ORC) is an effective way to generate electricity with low temperature thermal energy. For different temperatures and forms of heat sources, using the appropriate working medium and working under suitable conditions, can improve the ORC system’s power generation efficiency. Heat source with outlet temperature limit is a common heat source type, using regeneration in ORC may further improve this type heat source utilization efficiency of the power cycle. Thus, in this paper, the subcritical ORC model is built focusing on heat source with outlet temperature limitation. The dry and isentropic fluids which are promising in future application are used as working fluids. The heat source recovery exergy efficiency is used as the ORC performance criterion. The ORC performance is systematically compared under different regenerator effectiveness. The influence of regeneration on ORC performance is analyzed and the theoretical correlation is built with the calculation results. For the first time, a quantitative criterion for selecting the optimum heat regenerator effectiveness directly according to the cold and heat sources is established.
作者
翟慧星
王随林
安青松
史琳
安保林
Zhai Huixing;Wang Suilin;An Qingsong;Shi Lin;An Baolin(School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China;Department of Thermal Engineering,Tianjin University,Tianjin 300072,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2021年第4期472-480,共9页
Renewable Energy Resources
基金
北京市优秀人才培养资助青年骨干个人项目(2017000020124G108)
北京学者项目(2015No.022)
国家自然科学基金(51706235)。
关键词
有出口温度限制的热源
有机朗肯循环
回热度
定量准则
limited outlet temperature heat source
organic Rankine cycle
regenerate efficiency
quantitative criterion
作者简介
翟慧星(1989-),女,博士,讲师,研究方向为低品位可再生能源转化利用。E-mail:mxsl@tsinghua.edu.cn;通讯作者:史琳(1964-),女,博士,教授,研究方向为热力学及可再生能源利用。E-mail:mxsl@tsinghua.edu.cn。
