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Numerical study on the effect of separated over-fire air ratio on combustion characteristics and NOx emission in a 1000 MW supercritical CO2 boiler

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  • Gu, Mingyan
  • Wang, Mingming
  • Chen, Xue
  • Wang, Jimin
  • Lin, Yuyu
  • Chu, Huaqiang

Abstract

As an advanced power generation system, supercritical CO2 (S-CO2) coal fired power plant has advantages of high electric efficient and compact system layout. In this paper, the coal combustion characteristics and NOx formation in coal-fired S-CO2 boiler has been explored by numerical simulation. The boiler wall temperature distributions were determined according to the 1/8 partial flow strategy for S-CO2 coal-fired power plant. The effect of SOFA ratio on the gas flow field, the gas temperature, the species concentration including NOx distribution was investigated. The results show that the SOFA ratio has a great influence on the coal combustion process and NOx formation. With the increase of SOFA ratio, the O2 concentration decreases in the main coal burning zone, a higher CO concentration can be found. A lower gas temperature zone in the main burning zone and a lower NOx emission near the furnace outlet can also be observed with a higher SOFA ratio. The results presented promote a better understanding of the NOx formation characteristics and would be benefit for the NOx control in coal-fired S-CO2 boiler.

Suggested Citation

  • Gu, Mingyan & Wang, Mingming & Chen, Xue & Wang, Jimin & Lin, Yuyu & Chu, Huaqiang, 2019. "Numerical study on the effect of separated over-fire air ratio on combustion characteristics and NOx emission in a 1000 MW supercritical CO2 boiler," Energy, Elsevier, vol. 175(C), pages 593-603.
    • Handle: RePEc:eee:energy:v:175:y:2019:i:c:p:593-603
    DOI: 10.1016/j.energy.2019.03.111
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    3. Fan, Y.H. & Yang, D.L. & Tang, G.H. & Sheng, Q. & Li, X.L., 2022. "Design of S–CO2 coal-fired power system based on the multiscale analysis platform," Energy, Elsevier, vol. 240(C).
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    6. Wang, Yanhong & Li, Xiaoyu & Mao, Tianqin & Hu, Pengfei & Li, Xingcan & GuanWang,, 2022. "Mechanism modeling of optimal excess air coefficient for operating in coal fired boiler," Energy, Elsevier, vol. 261(PA).
    7. Zhou, Jing & Zhu, Meng & Xu, Kai & Su, Sheng & Tang, Yifang & Hu, Song & Wang, Yi & Xu, Jun & He, Limo & Xiang, Jun, 2020. "Key issues and innovative double-tangential circular boiler configurations for the 1000 MW coal-fired supercritical carbon dioxide power plant," Energy, Elsevier, vol. 199(C).
    8. Choi, Minsung & Hwang, Taegam & Park, Yeseul & Li, Xinzhuo & Kim, Junsung & Kim, Kibeom & Sung, Yonmo & Choi, Gyungmin, 2023. "Numerical evaluation of the effect of swirl configuration and fuel-rich environment on combustion and emission characteristics in a coal-fired boiler," Energy, Elsevier, vol. 268(C).
    9. Wang, Yanhong & Zou, Zhihong & Lu, Ke & Li, Qi & Li, Liyan, 2024. "Probing of operation economy for coal-fired unit under low loads with two fixed boundary conditions," Energy, Elsevier, vol. 288(C).
    10. Yuan Han & Chao Wang & Kairui Liu & Linxi Zhang & Yujie Zhu & Yankai Wang & Limin Wang & Defu Che, 2024. "Simulation of Dynamic Characteristics of Supercritical Boiler Based on Coupling Model of Combustion and Hydrodynamics," Energies, MDPI, vol. 17(21), pages 1-17, October.
    11. Zhou, Jing & Zhu, Meng & Su, Sheng & Chen, Lei & Xu, Jun & Hu, Song & Wang, Yi & Jiang, Long & Zhong, Wenqi & Xiang, Jun, 2020. "Numerical analysis and modified thermodynamic calculation methods for the furnace in the 1000 MW supercritical CO2 coal-fired boiler," Energy, Elsevier, vol. 212(C).

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