摘要
为充分研究双级串联有机朗肯循环发电系统的性能,以150℃的低温余热为热源,液化天然气(LNG)为冷源,[火用]效率最大为评价指标,对不同影响因素下双级串联有机朗肯循环系统进行了工质选择与参数优化。选用7种工质,采用粒子群算法,对系统的蒸发温度、膨胀机入口温度、冷凝温度和LNG蒸发压力进行了优化,对一定过热度及中间换热温度进行了分析。结果表明:一定过热度能提高系统的效率,中间换热温度对系统效率没有明显的影响,选用常温作为中间温度有较大意义;对系统效率影响最大的工质参数是常压沸点温度,常压沸点温度越低,系统[火用]效率越高。
In order to fully study the performance of cascade Organic Rankine Cycle(ORC)power generation system,low temperature waste heat at 150℃and liquefied natural gas were utilized as the heat source and heat sink,respectively,and the exergy efficiency was used as the optimization objective.Working fluid selection and parameter optimization were carried out for the cascade ORC.Selecting seven refrigerants as the working fluids,the evaporation temperature,turbine inlet temperature,condensation temperature and the LNG evaporation pressure were optimized via particle swarm optimization(PSO).A certain degree of overheat and intermediate heat transfer temperature were analyzed.The results show that a certain degree of overheat can improve the efficiency of the system,and the intermediate heat transfer temperature has no special effect for the efficiency of the system,it is of great significance to choose normal temperature as intermediate heat transfer temperature.The normal boiling point temperature of working fluid has the greatest effect on the system efficiency.The lower the normal boiling point temperature,the greater the system exergy efficiency.
作者
王蜀家
孙志新
WANG Shu-jia;SUN Zhi-xin(Hefei General Machinery Research Institute Co.,Ltd,Hefei 230031,Auhui Province,China;School of Chemical Engineering,Fuzhou University,Fuzhou 350108,Fujian Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第6期41-45,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(51406037)。
关键词
双级串联有机朗肯循环
不同影响因素
低温热源
液化天然气
cascade Organic Rankine Cycle
different influence factor
low grade heat
liquefied natural gas
