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A novel super high back pressure cascade heating scheme with multiple large-scale turbine units

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  • Ma, Liqun
  • Ge, Zhihua
  • Zhang, Fuxiang
  • Wei, Huimin

Abstract

The recovery of waste heat from power generation by the utilization of energy cascade for district heating has become an important method to improve the energy saving of combined heat and power (CHP) plants. In this paper, a novel super high back pressure (SHBP) cascade heating scheme is proposed to recover waste heat further and tap the energy saving potential of multi-unit combined heating system. On this basis, the regulation progress under full heating conditions is simulated. It’s concluded that the regulation progress can be divide into 4 stages, and the flow of extraction steam or the back pressure of turbines is adjusted to satisfy the varying heating demand. Furthermore, the detailed thermodynamic analysis of the novel cascade heating scheme is performed. The results indicate that, in the design condition, the heating process exergy efficiency of the SHBP scheme is improved by 10.4%, leading to an addition of 136.6 MW in generating power and a decline of 30.1% in the heating consumption rate. During the whole heating period, exhaust steam heat load ratio of the SHBP system reaches to 92.5%, which brings about the average heating consumption rate only 5.30 kg/GJ, and 72 thousand tons standard coal saved in total.

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  • Ma, Liqun & Ge, Zhihua & Zhang, Fuxiang & Wei, Huimin, 2020. "A novel super high back pressure cascade heating scheme with multiple large-scale turbine units," Energy, Elsevier, vol. 201(C).
    • Handle: RePEc:eee:energy:v:201:y:2020:i:c:s0360544220305764
    DOI: 10.1016/j.energy.2020.117469
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    Cited by:

    1. Wang, Xinwei & Duan, Liqiang & Zhu, Ziqiang, 2023. "Peak regulation performance study of GTCC based CHP system with compressor inlet air heating method," Energy, Elsevier, vol. 262(PA).
    2. Wang, Congyu & Song, Jiwei, 2023. "Performance assessment of the novel coal-fired combined heat and power plant integrating with flexibility renovations," Energy, Elsevier, vol. 263(PC).
    3. Zhang, Youjun & Xiong, Nian & Ge, Zhihua & Zhang, Yichen & Hao, Junhong & Yang, Zhiping, 2020. "A novel cascade heating system for waste heat recovery in the combined heat and power plant integrating with the steam jet pump," Applied Energy, Elsevier, vol. 278(C).
    4. Jinshi Wang & Weiqi Liu & Guangyao Liu & Weijia Sun & Gen Li & Binbin Qiu, 2020. "Theoretical Design and Analysis of the Waste Heat Recovery System of Turbine Exhaust Steam Using an Absorption Heat Pump for Heating Supply," Energies, MDPI, vol. 13(23), pages 1-19, November.
    5. Yuliang Dong & Songyuan Yu & Chengbing He & Qingbin Yu & Fang Fang, 2022. "Optimal Multi-Mode Flexibility Operation of CHP Units with Electrode Type Electric Boilers: A Case Study," Energies, MDPI, vol. 15(24), pages 1-21, December.
    6. 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.

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