两级复合源热泵用于天然气膨胀发电系统的性能分析与优化  

Performance Analysis and Optimization of Two-stage Composite Source Heat Pump for Natural Gas Expansion Power Generation System

作　　者：徐啸 张潇 吴正勇[1] 邹磊[1] 方超[1] 芦丁豪 XU Xiao;ZHANG Xiao;WU Zhengyong;ZOU Lei;FANG Chao;LU Dinghao(Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211000,China;School of Energy and Environment,Southeast University,Nanjing 211000,China;PipeChina West East Gas Pipeline Company,Yangzhou 225000,Jiangsu Province,China)

机构地区：[1]江苏方天电力技术有限公司,南京211000 [2]东南大学能源与环境学院,南京211000 [3]国家管网集团西气东输公司,江苏扬州225000

出　　处：《动力工程学报》2022年第9期881-888,共8页Journal of Chinese Society of Power Engineering

摘　　要：为降低天然气膨胀发电工艺中过高的预热能耗,在空气-土壤复合源两级热泵的基础上,提出了一种新型天然气多级膨胀发电系统。借助Matlab和Aspen Plus建立了系统的热力学与[火用]分析模型,探究了不同工况下膨胀比和压缩比的最佳分配策略,最后以扬州某高中压门站为例,比较了新旧系统的性能差异。结果表明:与单级空气源和土壤源热泵系统相比,新系统年均净输出电能占比为0.799,分别提高6.55%和7.14%;年均热泵性能系数为5.46,分别提高20.31%和27.76%;年均[火用]效率为48.9%,分别提高7.35%和7.93%。In order to reduce the excessive preheating energy consumption in natural gas expansion power generation process,a novel natural gas multi-stage expansion power generation system was proposed based on an air-soil composite source two-stage heat pump.Thermodynamic and exergy models of the system were established by Matlab and Aspen Plus.The optimal allocation strategy of expansion ratio and compression ratio under different working conditions was explored.Finally,the performance differences between the new and traditional systems were compared by taking a pressure regulating station in Yangzhou city as an example.Results show that compared with the single stage air-source and ground-source heat pump systems,the annual average net output power ratio of the new system is 0.799,which is incresed by 6.55%and 7.14%respectively;the annual average performance coefficient of heat pump is 5.46,increased by 20.31%and 27.76%respectively;the annual average exergy efficiency is 48.9%,increased by 7.35%and 7.93%respectively.

关 键 词：天然气 压力能回收 复合热源 两级热泵 

分 类 号：TK513[动力工程及工程热物理—热能工程]