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Enhancing the load ramp-up capability of the subcritical CFB power unit by considering the evolution of internal stored energy

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  • Zhao, Chenyu
  • Wang, Chaoyang
  • Fan, Jianlin
  • Liu, Ming
  • Liu, Jiping
  • Yan, Junjie

Abstract

The substantial inertia of the boiler restricts the flexibility of circulating fluidized bed (CFB) power units. To enhance the load ramp-up capability of the CFB power unit, we proposed a novel control strategy considering the spatial-temporal evolution of its internal stored energy. A dynamic model of the subcritical CFB power unit with a capacity of 300 MW was developed, incorporating the mechanism and control modules. By analyzing the spatial-temporal evolution of the stored energy in bed material, flue gases, refractory materials, economizer, evaporation subsystem, superheater subsystem, reheater subsystem, and turbine subsystem, we identified that the over-utilization of chemical and thermal stored energy in the bed materials is the primary factor restricting load ramp-up, while the thermal stored energy of the economizer is suitable for further utilization. Under the optimized control strategy that utilizes deviations of stored energy per mass of bed materials as a feedforward mechanism, the deviations of the key operating parameters during the load ramp-up process are significantly reduced, and the load ramp-up rate of the subcritical CFB power unit can be improved from 2.0 % Pe/min to 3.0 % Pe/min.

Suggested Citation

  • Zhao, Chenyu & Wang, Chaoyang & Fan, Jianlin & Liu, Ming & Liu, Jiping & Yan, Junjie, 2024. "Enhancing the load ramp-up capability of the subcritical CFB power unit by considering the evolution of internal stored energy," Energy, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:energy:v:307:y:2024:i:c:s0360544224023454
    DOI: 10.1016/j.energy.2024.132571
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    References listed on IDEAS

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    1. Wang, Chaoyang & Liu, Ming & Li, Bingxin & Liu, Yiwen & Yan, Junjie, 2017. "Thermodynamic analysis on the transient cycling of coal-fired power plants: Simulation study of a 660 MW supercritical unit," Energy, Elsevier, vol. 122(C), pages 505-527.
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    3. Liu, Zefeng & Wang, Chaoyang & Fan, Jianlin & Liu, Ming & Xing, Yong & Yan, Junjie, 2024. "Enhancing the flexibility and stability of coal-fired power plants by optimizing control schemes of throttling high-pressure extraction steam," Energy, Elsevier, vol. 288(C).
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