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Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation

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  • Yin, Junjie
  • Liu, Ming
  • Zhao, Yongliang
  • Wang, Chaoyang
  • Yan, Junjie

Abstract

The variation in feeding coal quality is a major issue during coal-fired power unit operation because it causes output power fluctuation, increase in heat losses, and operation safety risks. Given this situation, the effect of coal quality variation on power plant performance should be explored to improve the control strategy considering coal quality variation. In this study, dynamic models of coal-fired power plants are developed. Results show that the unit efficiency decreases when the coal quality worsens, and the carbon, ash, and moisture contents in coal are dominant factors. Dynamic processes with coal quality variation are simulated, and overtemperature risks, deviation of output power, and additional energy consumption are evaluated. Then, the modification of control strategy is proposed to enhance the coal-fired power unit performance, which adds coal quality variation into the water–fuel ratio calculation. With the modified control logic, the duration of the dynamic process is reduced by approximately 40%, and the fluctuation amplitudes of the live and reheat steam temperatures are decreased by approximately 90% and 60%, respectively. In addition, the additional energy consumption is diminished.

Suggested Citation

  • Yin, Junjie & Liu, Ming & Zhao, Yongliang & Wang, Chaoyang & Yan, Junjie, 2021. "Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation," Energy, Elsevier, vol. 223(C).
    • Handle: RePEc:eee:energy:v:223:y:2021:i:c:s0360544221003261
    DOI: 10.1016/j.energy.2021.120077
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    3. Hou, Guolian & Huang, Ting & Zheng, Fumeng & Gong, Linjuan & Huang, Congzhi & Zhang, Jianhua, 2023. "Application of multi-agent EADRC in flexible operation of combined heat and power plant considering carbon emission and economy," Energy, Elsevier, vol. 263(PB).
    4. Ni, Guanhua & Dou, Haoran & Li, Zhao & Zhu, Chuanjie & Sun, Gongshuai & Hu, Xiangming & Wang, Gang & Liu, Yixin & Wang, Zhenyang, 2022. "Study on the combustion characteristics of bituminous coal modified by typical inorganic acids," Energy, Elsevier, vol. 261(PA).
    5. Shang, Jingyi & Gao, Jinfeng & Jiang, Xin & Liu, Mingguang & Liu, Dunnan, 2023. "Optimal configuration of hybrid energy systems considering power to hydrogen and electricity-price prediction: A two-stage multi-objective bi-level framework," Energy, Elsevier, vol. 263(PF).
    6. Yan, Hui & Liu, Ming & Wang, Zhu & Zhang, Kezhen & Chong, Daotong & Yan, Junjie, 2023. "Flexibility enhancement of solar-aided coal-fired power plant under different direct normal irradiance conditions," Energy, Elsevier, vol. 262(PA).

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