变冷凝工况地热有机朗肯循环发电系统  

Geothermal heat power organic Rankine cycle system under different condensation temperatures

作　　者：苗政[1] 刘广林[1] 徐进良[1] 吕鹏飞[2] 张兵[1] 

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]中国石化集团新星石油有限责任公司,北京100083

出　　处：《重庆大学学报（自然科学版）》2014年第6期51-55,共5页Journal of Chongqing University

基　　金：北京市自然科学基金资助项目(3122029);国家"973"资助项目(2011CB710703);国家自然科学基金青年项目(51306048);中央高校科研业务费资助项目(12QN20)

摘　　要：针对有机朗肯循环发电系统中冷凝介质温度随环境温度变化而变化,地热源载热流体参数恒定的问题,采用EES软件计算分析了饱和有机朗肯循环发电系统在使用工质R245fa和R601a时输出净功随冷凝介质温度变化的规律,同时分析了膨胀机最佳入口温度、膨胀比和工质流量3个主要参数的变化。结果表明:当地热流体温度为130℃,冷凝介质温度从30℃降到0℃时,有机工质在膨胀机入口的最佳温度升高且波动幅度达15℃,同时系统净输出功增长达120%;工质质量流量增加超过30%,膨胀比增大约2倍。In the geothermal heat organic Rankine cycle power generation system,condensation temperature is sensitive to the environment condition while the geothermal fluid parameters remain constant. In this paper simulation of the ORC system is carried out through the EES software to analyze the effect of the condensation temperature in a saturated organic Rankine cycle power generation system using R245fa and R601a as working fluid. The optimal expansion ratio, mass flow rates and the inlet temperature of the expander are also studied. The results show that, when the temperature of the geothermal fluid is kept at 130 ℃, the optimal working fluid temperature at the expander entrance increases by 15 ℃ with the condensation temperature decreasing from 30 ℃ to 0 ℃. At the same time, the system net power output growth by 120%, refrigerant mass flow rate increases more than 30%, and the expansion ratio becomes approximately 2 times higher. This leads to higher requirements on the initial system design and control.

关 键 词：地热发电 有机朗肯循环 工质 系统分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理]