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An Improved Heating System with Waste Pressure Utilization in a 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)

  • Jidong Xu

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

  • Yao Xiao

    (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)

  • 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

An improved heating system integrated with waste pressure utilization (WPU) for combined heat and power (CHP) cogeneration was proposed. The new heating system efficiently utilized the excess pressure of the extraction heating steam to drive the WPU turbine and generator for producing electricity, achieving higher energy efficiency and lower fuel consumption of the CHP unit. The results of the detailed thermodynamic analysis showed that applying the proposed concept in a typical 300 MW coal-fired CHP unit could reduce the standard coal consumption rate by 9.84 g/(kW·h), with a thermal efficiency improvement of 1.97% (absolute value). Compared to that of the original heating process, the energy efficiency of the proposed process decreased by 0.55% (absolute value), but its exergy efficiency increased dramatically by 17.97% (absolute value), which meant that the proposed configuration could make better use of the steam energy and contribute to the better performance of the CHP unit. As the unit generation load and supply and return-water temperatures declined and the unit heating load rose, the WPU system would generate more electricity and its energy-saving benefit would be enhanced. This work provides a promising approach to further advance the CHP technology and district heating systems.

Suggested Citation

  • Heng Chen & Jidong Xu & Yao Xiao & Zhen Qi & Gang Xu & Yongping Yang, 2018. "An Improved Heating System with Waste Pressure Utilization in a Combined Heat and Power Unit," Energies, MDPI, vol. 11(6), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1515-:d:151799
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    References listed on IDEAS

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    Cited by:

    1. 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.
    2. Topal, Halil İbrahim & Tol, Hakan İbrahim & Kopaç, Mehmet & Arabkoohsar, Ahmad, 2022. "Energy, exergy and economic investigation of operating temperature impacts on district heating systems: Transition from high to low-temperature networks," Energy, Elsevier, vol. 251(C).
    3. Chen, Heng & Wang, Yihan & Li, Jiarui & Xu, Gang & Lei, Jing & Liu, Tong, 2022. "Thermodynamic analysis and economic assessment of an improved geothermal power system integrated with a biomass-fired cogeneration plant," Energy, Elsevier, vol. 240(C).
    4. Khuram Pervez Amber & Antony R. Day & Naeem Iqbal Ratyal & Rizwan Ahmad & Muhammad Amar, 2018. "The Significance of a Building’s Energy Consumption Profiles for the Optimum Sizing of a Combined Heat and Power (CHP) System—A Case Study for a Student Residence Hall," Sustainability, MDPI, vol. 10(6), pages 1-16, June.

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