蒸发温度对低温冷能回收ORC发电系统特性的影响  

Effect of Evaporation Temperature on Characteristic of Low Temperature Cold Energy Recovery ORC Power Generation System

作　　者：刘兴华[1] 朱俊达 孙欢[1] 胡晓微[1] LIU Xing-hua;ZHU Jun-da;SUN Huan;HU Xiao-wei(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《保鲜与加工》2023年第2期15-22,共8页Storage and Process

基　　金：太阳能高温热泵供暖及有机朗肯循环低温发电复合系统关键技术研究(18JCYBJC90500)。

摘　　要：基于ORC系统,通过Matlab、Refprop建立低温冷能回收发电系统的数学模型,以R245a为工质,在保证冷源温度不变的条件下,在蒸发温度55~70℃范围内,对系统进行热力学分析,探究蒸发温度对发电系统的换热特性、发电功率、系统热效率与(火用)效率的影响。结果表明,当蒸发温度由55℃上升至70℃时,系统冷凝器、蒸发器热容量流率分别下降了29%和32%,系统总不可逆损失增大,但膨胀机效率提高,系统净发电功率增加约22%,系统热效率和(火用)效率分别增加0.35%和7.2%。Based on the Organic rankine cycle(ORC)system,a mathematical model of low-temperature cold energy recovery power generation system was established through Matlab and Refprop.Using R245a as the working fluid,keeping the the cold source temperature constant,thermodynamic analysis of the system was carried out in the evaporation temperature range of 55~70℃.The effect of evaporation temperature on the heat transfer characteristics,power generation,system thermal efficiency and exergy efficiency of the power generation system was explored.The results showed that when evaporation temperature from 55℃ to 70℃,the heat capacity flow rates of the system condenser and evaporator decreased by 29% and 32%,respectively,the total irreversible loss of the system increased,but the expander machine efficiency improved,the net power generation of the system increased by about 22%,and the thermal efficiency and exergy efficiency of the system increased by 0.35%and 7.2%,respectively.

关 键 词：冷能回收 ORC 蒸发温度 系统特性 

分 类 号：TB657[一般工业技术—制冷工程]