柴油机排气余热的有机朗肯循环发电系统-北京工业大学学报.pdf

第38卷 第9期 北 京 工 业 大 学 学 报 Vol.38 No.9 2012年 9月 JOURNAL OF BEIJING UNIVERSITY OFTECHNOLOGY Sep. 2012 柴油机排气余热的有机朗肯循环发电系统 张红光,刘摇 彬,梁摇 虹,陈摇 研,杨摇 凯,吴玉庭,王摇 伟 (北京工业大学 环境与能源工程学院,北京摇 100124) 摘摇 要:针对柴油机排气余热的特点设计了有机朗肯循环(organic Rankine cycle,ORC)系统. 在该系统中,采用 R245fa(1,1,1,3,3鄄五氟丙烷)作为循环工质,针对其不同蒸发温度以及冷凝温度,通过模拟计算研究了最终排气温 度、系统净输出功率和朗肯循环实际效率的变化规律. 研究结果表明,当蒸发温度低于367郾46 K时应采用一级膨 胀系统;当蒸发温度高于367郾46K低于404郾6K时应采用二级膨胀系统;冷凝温度恒定时,最终排气温度随蒸发温 度的升高而降低,系统净输出功率和朗肯循环实际效率随蒸发温度的升高而升高;蒸发温度恒定时,最终排气温度 随冷凝温度的降低而降低,系统净输出功率和朗肯循环实际效率随冷凝温度的降低而升高. 关键词:余热;有机朗肯循环;柴油机 中图分类号:TK406 文献标志码:A 文章编号:0254-0037(2012)09-1431-05 Power System of Diesel Engine Waste Heat Recovery With a ORC System ZHANG Hong鄄guang,LIU Bin,LIANG Hong,CHEN Yan,YANG Kai,WU Yu鄄ting,WANG Wei (College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China) Abstract:To reuse the diesel engine of waste heat in exhaust, organic Rankine cycle (ORC) was proposed. R245fa (1, 1, 1,3,3鄄pentaflu鄄oropropane) was used as the working fluid in the ORC system. Final exhaust temperature,net work and actual efficiency of ORC were studied under different evaporating temperatureandcoolingtemperatures. Theresultsshow thatprimary expansion system should be selected when the evaporating temperature is lower than 367. 46 K. However,when the evaporating temperature is higher than 367. 46 K but lower than 404. 6 K, two鄄level expansion system is recommended. For afixedcoolingtemperature,final exhausttemperatureisdecreased,but networkand actual efficiency of ORC are increased with the increase of the evaporating temperature. Under a given evaporating temperature,final exhaust temperature is decreased,bu