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Discussion on the Feasibility of Deep Peak Regulation for Ultra-Supercritical Circulating Fluidized Bed Boiler

Author

Listed:
  • Shengwei Xin

    (CHN Energy Group CFB Technology R&D Center, Xi’an 710065, China)

  • Hu Wang

    (CHN Energy Group CFB Technology R&D Center, Xi’an 710065, China)

  • Jianbo Li

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China)

  • Gang Wang

    (Harbin Boiler Co., Ltd., Harbin 150046, China)

  • Quanhai Wang

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China)

  • Peiqing Cao

    (CHN Energy Group CFB Technology R&D Center, Xi’an 710065, China)

  • Peng Zhang

    (CHN Energy Group CFB Technology R&D Center, Xi’an 710065, China)

  • Xiaofeng Lu

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China)

Abstract

In order to meet the flexibility operation needs of coal-fired units under the goal of carbon peak and carbon neutralization, it is imperative for circulating fluidized bed (CFB) units to participate in deep peak regulation. By systematically summarizing deep peak regulation operation practice of existing SC and subcritical-parameter-levels CFB units, the feasibility of deep peak regulation technology of an ultra-supercritical (USC) CFB unit under development and being built is analyzed and demonstrated; meanwhile, the deep peak regulation capacity of the boiler is also predicted. The results show that by analyzing the structural characteristics and design performance of the USC-CFB boiler, for technical problems such as stable combustion under low load, hydrodynamic safety, denitration performance under wide load, and rapid boiler load change rate existing in deep peak regulation, technical measures were implemented by selecting advanced boiler furnace type, adopting good design technology of the secondary rising water wall and uniformity design of bed temperature and bed pressure, strengthening the reducing atmosphere inside the furnace, improving the performance of wear-resistant refractory materials, quickly controlling the furnace bed material stock under variable load, optimizing the control strategy of CFB unit, and so on. The boiler achieved good operation characteristics and good deep peak regulation performance, and the pollutant emissions can steadily achieve ultra-low emission standards. When the USC-CFB unit participates in deep peak regulation, the minimum stable combustion load of the boiler can reach 20~30% BMCR, and a boiler load change rate under 30% BMCR or above could reach 1.5~2% BMCR/min, while that below 30% BMCR could reach 1% BMCR/min. The research results can provide references for the deep peak regulation of in-service supercritical (SC) CFB units and design optimization of similar USC-CFB units.

Suggested Citation

  • Shengwei Xin & Hu Wang & Jianbo Li & Gang Wang & Quanhai Wang & Peiqing Cao & Peng Zhang & Xiaofeng Lu, 2022. "Discussion on the Feasibility of Deep Peak Regulation for Ultra-Supercritical Circulating Fluidized Bed Boiler," Energies, MDPI, vol. 15(20), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7720-:d:947099
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    Citations

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    Cited by:

    1. Jun Zhang & Yanmin Li & Lin Mei & Xiaoliang Yu & Xun Lv & Jinping Wang & Jin Yan & Rongyue Sun, 2023. "Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw," Energies, MDPI, vol. 16(8), pages 1-15, April.
    2. Haowen Wu & Tuo Zhou & Xiannan Hu & Yongjun Luo & Man Zhang & Hairui Yang, 2023. "Thermal–Hydraulic Calculation and Analysis on Water Wall System of a 700 MWe Ultra-Supercritical CFB Boiler," Energies, MDPI, vol. 16(11), pages 1-11, May.

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