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Energy, Exergy and Economic Analyses of a Combined Heating and Power System with Turbine-Driving Fans and Pumps in Northeast China

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  • Ximei Li

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Jianmin Gao

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yaning Zhang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yu Zhang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Qian Du

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Shaohua Wu

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yukun Qin

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

Abstract

The combined heating and power (CHP) system with turbine-driving fans and pumps is more efficient and economical in meeting heat demand in cold areas, however, there are no detailed studies that investigate its thermodynamic performance, improvement possibilities and economy. In this paper, the energy, exergy and economic analysis of a CHP system with turbine-driving fans and pumps operated in Northeast China were conducted to provide insights into improvement options. It is revealed that the boiler is the main source of exergy destruction, followed by the steam-water heat exchangers (SWHE), temperature and pressure reducer (TPR), turbines, and deaerator. The energy and exergy efficiencies of the system are 89.72% and 10.07%, while the boiler’s are 84.89% and 30.04%. The thermodynamic performance of the boiler and turbines are compared with other studies, and the inefficiencies of major components are analyzed and some advice for further improvement is given. As the reference state changes, the main conclusions stay the same. The turbine-driving mode saves an electricity cost of 16,654.08 yuan on 15 December 2018. The effect of electricity price and on-grid price on the saved daily electricity cost is investigated and it proves that the turbine-driving mode is more economical in China.

Suggested Citation

  • Ximei Li & Jianmin Gao & Yaning Zhang & Yu Zhang & Qian Du & Shaohua Wu & Yukun Qin, 2020. "Energy, Exergy and Economic Analyses of a Combined Heating and Power System with Turbine-Driving Fans and Pumps in Northeast China," Energies, MDPI, vol. 13(4), pages 1-22, February.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:878-:d:321478
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