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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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    Cited by:

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    3. 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).
    4. 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).
    5. Darbandi, Masoud & Fatin, Ali & Bordbar, Hadi, 2020. "Numerical study on NOx reduction in a large-scale heavy fuel oil-fired boiler using suitable burner adjustments," Energy, Elsevier, vol. 199(C).
    6. Choi, Minsung & Park, Yeseul & Li, Xinzhuo & Kim, Kibeom & Sung, Yonmo & Hwang, Taegam & Choi, Gyungmin, 2021. "Numerical evaluation of pulverized coal swirling flames and NOx emissions in a coal-fired boiler: Effects of co- and counter-swirling flames and coal injection modes," Energy, Elsevier, vol. 217(C).
    7. Zhu, Meng & Zhou, Jing & Chen, Lei & Su, Sheng & Hu, Song & Qing, Haoran & Li, Aishu & Wang, Yi & Zhong, Wenqi & Xiang, Jun, 2022. "Economic analysis and cost modeling of supercritical CO2 coal-fired boiler based on global optimization," Energy, Elsevier, vol. 239(PD).
    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).

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