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Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit

Author

Listed:
  • Heng Chen

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Zhen Qi

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Qiao Chen

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Yunyun Wu

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Gang Xu

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Yongping Yang

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

Abstract

A conceptual high-back pressure (HBP) heating system cooperating raw coal pre-drying for combined heat and power (CHP) was proposed to improve the performance of the HBP-CHP unit. In the new design, besides of heating the supply-water of the heating network, a portion of the exhaust steam from the turbine is employed to desiccate the raw coal prior to the coal pulverizer, which further recovers the waste heat of the exhaust steam and contributes to raising the overall efficiency of the unit. Thermodynamic and economic analyzes were conducted based on a typical 300 MW coal-fired HBP-CHP unit with the application of the modified configuration. The results showed that the power generation thermal efficiency promotion of the unit reaches 1.7% (absolute value) owing to suggested retrofitting, and meanwhile, the power generation standard coal consumption rate is diminished by 5.8 g/kWh. Due to the raw coal pre-drying, the energy loss of the exhaust flue gas of the boiler is reduced by 19.1% and the boiler efficiency increases from 92.7% to 95.4%. The impacts of the water content of the dried coal and the unit heating capacity on the energy-saving effect of the new concept were also examined.

Suggested Citation

  • Heng Chen & Zhen Qi & Qiao Chen & Yunyun Wu & Gang Xu & Yongping Yang, 2018. "Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit," Energies, MDPI, vol. 11(9), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2487-:d:170711
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    Cited by:

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    2. Xiaolong Yang & Yan Li & Dongxiao Niu & Lijie Sun, 2019. "Research on the Economic Benefit Evaluation of Combined Heat and Power (CHP) Technical Renovation Projects Based on the Improved Factor Analysis and Incremental Method in China," Sustainability, MDPI, vol. 11(19), pages 1-23, September.
    3. Tilia Dahou & Patrick Dutournié & Lionel Limousy & Simona Bennici & Nicolas Perea, 2019. "Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses," Energies, MDPI, vol. 12(3), pages 1-17, February.
    4. Shifei Zhao & Weishu Wang & Zhihua Ge, 2020. "Energy and Exergy Evaluations of a Combined Heat and Power System with a High Back-Pressure Turbine under Full Operating Conditions," Energies, MDPI, vol. 13(17), pages 1-18, August.
    5. Halina Pawlak–Kruczek & Michał Czerep & Lukasz Niedzwiecki & Emmanouil Karampinis & Ioannis Violidakis & Ioannis Avagianos & Panagiotis Grammelis, 2019. "Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat," Energies, MDPI, vol. 12(7), pages 1-22, March.

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