基于㶲分析的再热/抽气回热/内回热有机朗肯循环的优化  

Optimization of a combined reheating/regenerative/internal regenerative organic Rankine cycle based on exergy analysis

作　　者：曹园树 胡冰[1,2] 梁立鹏[1,2] 卜宪标[1] 马伟斌[1] 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源重点实验室,广东广州510640 [2]中国科学院大学,北京100049

出　　处：《可再生能源》2015年第5期741-746,共6页Renewable Energy Resources

基　　金：国家高新技术研究发展计划项目(2012AA053003);国家自然科学基金项目(51106161);广州市珠江科技新星专项(2014J2200079)

摘　　要：提出一种具有再热/抽气回热/内回热的联合有机朗肯循环(CRORC)系统。该系统以低温热能作为驱动热源,以R245fa为循环工质。基于分析,对CRORC系统进行了优化。蒸发器、冷凝器、膨胀机II是CRORC系统损失的主要来源,随着抽气压力及再热压力的升高,CRORC系统的效率呈现先增大后减小的趋势,并存在最佳抽气压力/再热压力组合,使系统效率最高。相对于基本回热/抽气回热以及抽气回热/内回热结合的有机朗肯循环,CRORC有更高的效率。A combined reheating, regenerative and internal regenerative organic Rankine cycle（CRORC） is put forwarded for the utilization of low grade thermal energy, which consists of a reheat, a mixing chamber and an internal heat exchanger in addition. R245 fa is selected as the working fluid. Based on exergy analysis, the CRORC system is optimized. Evaporator, condenser,expander II are the main sources of exergy loss in CRORC system. With the increase of extraction pressure and reheat pressure, system exergy efficiency first increases then decreases. And there exits an optimum combination of extraction pressure and reheat pressure, at which the system has the largest exergy efficiency. Compared with basic organic Rankine cycle（ORC）, regenerative ORC, and combined regenerative-internal regenerative ORC, the CRORC has higher exergy efficiency.

关 键 词：有机朗肯循环 再热/抽气回热/内回热 㶲分析 优化 

分 类 号：TK529[动力工程及工程热物理—热能工程]