有机朗肯循环蒸发器多目标优化设计及工质筛选  

Multi-objective Optimization Design of an Evaporator for Organic Rankine Cycle and the Working Fluid Selection

作　　者：韩中合[1] 梅中恺 李鹏[1] HAN Zhonghe;MEI Zhongkai;LI Peng(MOE＇s Key Lab of Condition Monitoring and Control for Power Plant Equipment,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003

出　　处：《动力工程学报》2018年第11期934-940,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51306059);国家科技支撑计划资助项目(2014BAA06B01);中央高校基本科研业务费专项资金资助项目(2017XS120)

摘　　要：针对130℃的地热水热源,将R245fa、R123、R114、R245ca和R124作为待选工质。以平板式换热器为蒸发器,对板长、板宽和平板间距进行多目标优化设计,以蒸发器面积和蒸发器总压降为目标函数构建多目标优化模型,基于NSGA-Ⅱ算法对多目标优化模型进行求解。结果表明:随着板长的增加,蒸发器总压降增大,蒸发器面积减小;随着板宽和板间距的增加,蒸发器总压降减小,蒸发器面积增大;在板间距为0.002 5m、单个板片的面积为0.3～0.6m2时,蒸发器的综合性能较优;R245ca的综合性能最优,R245fa和R123的综合性能次优。Taking the 130℃geothermal water as the heat source of an organic Rankine cycle,working fluids R245 fa,R123,R114,R245 ca and R124 were selected as the candidate media,while a multi-objection optimization design was performed on the plate type evaporator,with focus on the length,width and spacing of plate,so as to establish a multi-objective optimization model by taking the evaporator area and evaporator pressure drop as the performance indicators,which was then solved using NSGA-Ⅱalgorithm.Results show that the total evaporator pressure drop increases and the evaporator area decreases with the rise of plate length,while the total evaporator pressure drop decreases and the evaporator area increases with the rise of plate width and plate spacing.For all the working fluids,the overall performance of evaporator is relatively good for the plate spacing of 0.002 5 mand the area of a single plate in 0.3-0.6 m2.Among all the working fluids,R245 ca is found to be comprehensively optimal,followed by R245 fa and R123.

关 键 词：地热水 有机朗肯循环 多目标优化设计 工质筛选 

分 类 号：TK123[动力工程及工程热物理—工程热物理]