摘要
为充分利用柴油机的余热能量,针对一台车用六缸柴油机,设计了一套双有机朗肯循环系统,用来回收柴油机的排气能量和冷却系统具有的能量.该双有机朗肯循环系统包括高温循环和低温循环,均采用R245fa作为工质,高温循环用于回收柴油机排气能量,低温循环用于回收柴油机冷却系统能量和高温循环冷凝过程中工质所释放的能量.通过台架试验,在研究柴油机变工况下余热能分布特性的基础上,对双有机朗肯循环系统的余热能回收潜力进行了分析.分析结果表明:在柴油机整个工况范围内,双有机朗肯循环系统的净输出功率最高可达26.58kW,系统热效率最高可达14.62%;柴油机-双有机朗肯循环联合系统在燃油经济性和动力性方面具有明显的优势.
In order to take full advantage of the waste heat from a diesel engine,a set of dual loop organic Rankine cycle（ORC）system was designed to recover exhaust energy and waste heat of the coolant for a six-cylinder vehicle diesel engine.The dual loop ORC system consists of a high temperature（HT）loop ORC system and a low temperature（LT）loop ORC system,and R245 fa was selected as working fluid for the dual loop ORC system.The HT loop ORC system was used to recover the exhaust energy,while the LT loop ORC system was for recovering the waste heat from the coolant and the released heat in condensation process of the HT loop ORC system.Through the engine test,the performance of the dual loop ORC system for waste heat recovery was discussed on the basis of the analysis on waste heat characteristics under engine various operating conditions.The results show that,under engine entire operating conditions,the maximum net power output of the dual loop ORC system is 26.58 kW,the maximum thermal efficiency can reach up to 14.62%;and the combined system of diesel engine and dual loop organic Rankine cycle has better fuel economy and power performance.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2015年第5期471-476,共6页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(51376011)
北京市教育委员会科技计划重点项目(KZ201410005003)
国家"九七三"计划项目(2011CB707202)
北京工业大学第十三届研究生科技基金资助项目(ykj-2014-10708)
关键词
车用柴油机
双有机朗肯循环
变工况
余热回收
vehicle diesel engine
dual loop organic Rankine cycle
various operating conditions
waste heat recovery
