蒸发器夹点温差对ORC系统性能影响的研究  

Influence on pinch point temperature difference of evaporator on the performance of ORC system

作　　者：石文琪 马新灵[1,2] 魏新利 韩江涛[1] Shi Wenqi;Ma Xinling;Wei Xinli;Han Jiangtao(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;Engineering Research Center of Energy Saving Technology and Equipments in Thermal System,Ministry of Education,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力学院,郑州450001 [2]热能系统节能技术与装备教育部工程技术研究中心,郑州450001

出　　处：《低温与超导》2020年第8期62-68,77,共8页Cryogenics and Superconductivity

基　　金：河南省高等学校重点科研项目计划(182102210015)。

摘　　要：为研究蒸发器夹点温差对有机朗肯循环系统性能的影响,本文运用Aspen Plus建立系统模型,研究了不同工质(R245fa、R1234ze、R1234yf、R134a、R600a)和热源温度(105~165℃)对有机朗肯循环系统的热力性能的影响;此外,选取净输出功率、■效率、热效率和自定义的综合评价指标f(x)来衡量系统的性能。结果表明:随着夹点温差的增大,系统净输出功、■效率和热效率均降低,而f(x)值先降低后升高,即存在最优夹点温差。R134a、R1234yf、R1234ze、R600a、R245fa五种工质对应的最优夹点温差分别为18、9、12、15、15℃,其中R245fa的f(x)值最小,性能最佳。此外,工质为R245fa时,当热源温度为105℃时,系统性能最佳,最优夹点温差15℃。In order to study the influence of the evaporator pinch point temperature difference on the performance of organic Rankine cycle system,this paper used Aspen Plus software to establish the system model,so as to study the influence of different working substances(R245 fa,R1234 ze,R1234 yf,R134 a,R600)and heat source temperature(105~165℃)on the thermal performance of ORC system.In addition,the thesis chose net output power,exergy efficiency,thermal efficiency and customized comprehensive evaluation index f(x)to measure the performance of the system.As a result,with the increase of pinch point temperature difference,the net output power,exergy efficiency and thermal efficiency of the system decrease,however,the value of f(x)first decreases and then increases,that is to say,there is an optimal pinch point temperature difference.The optimum temperature difference of five working substances(R134 a,R1234 yf,R1234 ze,R600 a,R245 fa)is 18,9,12,15 and 15℃.Among them,R245 fa has the lowest f(x)value and the best performance.In addition,when the working substance is R245 fa and the heat source temperature is 105℃,the system performance is the best that the optimal temperature difference between pinch points is 15℃.

关 键 词：有机朗肯循环 夹点温差 工质 多目标函数f(x) 参数优化 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]