Energy and exergy analyses of S–CO2 coal-fired power plant with reheating processes

被引：26

作者：

Chen Z. ^{[1
,2
]}

Wang Y. ^{[1
,2
]}

Zhang X. ^{[3
]}

机构：

[1] The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing

[2] The Key Laboratory of Power Station Energy Transfer Conversion and System, North China Electric Power University, Ministry of Education

[3] Hainan University, 570228, Hainan

来源：

Energy | 2021年 / 211卷

基金：

中国博士后科学基金;

关键词：

Coal-fired power plant; Exergy analysis; Reheat process; S–CO[!sub]2[!/sub] brayton cycle;

D O I：

10.1016/j.energy.2020.118651

中图分类号：

学科分类号：

摘要：

S–CO2 (Supercritical-CO2) coal-fired power plant is a promising technology for efficient and clean utilization of coal for power generation. The conversion and transfer of the energy and exergy in the power plants with double-reheat and single-reheat processes are studied. With the main gas parameters of 32 MPa/893.15 K, the power generation efficiencies of the S–CO2 coal-fired power plant with double-reheat and single-reheat processes are 49.06% and 48.72%, respectively. The corresponding exergy efficiencies are 48.02% and 47.69%, respectively. The origins of exergy destructions in different units are studied using the Energy Utilization Diagram (EUD) method. The exergy distributions of the power plants are presented. For the power plant with double-reheat process, the work output, the exergy exhaust into the atmosphere, the exergy destruction in combustion process, the exergy destruction in heat transfer processes, the exergy destruction caused by pressure loss, and the exergy destructions in turbo systems account for 48.02%, 9.66%, 20.45%, 17.56%, 1.08%, and 3.23% of the total exergy input of the power plant, respectively. © 2020 Elsevier Ltd

引用

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