夹点温差对sCO_(2)再压缩循环性能及经济性的影响  

Effect of Pinch Point Temperature Differences on Performance and Economy of Supercritical CO_(2) Recompression Brayton Cycle

作　　者：吕勇兴 闫晨帅[2] LÜYongxing;YAN Chenshuai(China Gezhouba Group Electric Power Co.,Ltd.,Beijing 100020,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]中国葛洲坝集团电力有限责任公司,北京100020 [2]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《动力工程学报》2022年第7期686-692,共7页Journal of Chinese Society of Power Engineering

摘　　要：以超临界CO_(2)再压缩布雷顿循环发电系统为对象,研究了低温回热器夹点温差ΔT_(p,LTR)和高温回热器夹点温差ΔT_(p,HTR)对循环性能和经济性的影响,并基于循环系统各部件的热功分布和损分布分析了夹点温差对循环性能和经济性产生影响的原因。结果表明:与ΔT_(p,HTR)变化相比,循环热效率ηth和效率ηexe对ΔT_(p,LTR)的变化更敏感;回热器总换热面积与循环性能对ΔT_(p,LTR)和ΔT_(p,HTR)的敏感性相似;在指定循环热效率下均存在ΔT_(p,LTR)与ΔT_(p,HTR)的最佳匹配,使回热器总换热面积最小。Taking the supercritical CO_(2) recompression Brayton cycle power generation system as the object,the effect of pinch point temperature differences of low temperature recuperator(ΔT_(p,LTR))and high tem-perature recuperator(ΔT_(p,HTR))on performance and economy of the cycle system was analyzed.Based on the thermal power distribution and exergy loss distribution of various components of the cycle system,the causes for the impact of pinch point temperature differences on cycle performance and economy were stud-ied.Results show that compared with the change ofΔT_(p,HTR),cycle thermal efficiency and exergy efficiency are more sensitive to the change ofΔT_(p,LTR).The sensitivities of total heat exchange area of the recuperator and cycle performance toΔT_(p,LTR) and ΔT_(p,HTR)are similar.There always exists an optimal match betweenΔT_(p,LTR) and ΔT_(p,HTR)under the specified cycle thermal efficiency,so that the total heat exchange area of the recuperator reaches the minimum.

关 键 词：sCO_(2)布雷顿循环 回热器 夹点温差 热效率 [火用]效率 经济性 

分 类 号：TK12[动力工程及工程热物理—工程热物理]