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Optimization of Air Distribution to Reduce NOx Emission and Unburned Carbon for the Retrofit of a 500 MWe Tangential-Firing Coal Boiler

Author

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  • Hyunbin Jo

    (School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea)

  • Kiseop Kang

    (School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea)

  • Jongkeun Park

    (School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea)

  • Changkook Ryu

    (School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea)

  • Hyunsoo Ahn

    (Doosan Heavy Industries and Construction, Youngin 16858, Korea)

  • Younggun Go

    (Doosan Heavy Industries and Construction, Youngin 16858, Korea)

Abstract

The use of separated overfire air (SOFA) has become a standard technique of air staging for NOx reduction in the coal-fired boiler and can also be applied to existing boilers by retrofit. This study was to optimize the air distribution for the proposed SOFA installation in a 500 MWe tangential-firing boiler that has 20 identical units in Korea. Using computational fluid dynamics (CFD) incorporating advanced coal combustion submodels, the reference case was established in good agreement with the design data, and different flow ratios of burner secondary air, close-coupled OFA (CCOFA), and SOFA were evaluated. Increasing the total OFA ratio effectively suppressed NO formation within the burner zone but had a negative impact on the boiler performance. With moderate air staging, NO reduction became active between the CCOFA and SOFA levels and, therefore, the OFA distribution could be optimized for the overall boiler performance. For total OFA ratios of 25% and 30% with respective burner zone stoichiometric ratios of 0.847 and 0.791, increasing the SOFA ratio to 15% and 20%, respectively, was ideal for decreasing the unburned carbon release and ash slagging as well as NO emission. Too high or low SOFA ratios rapidly increased the unburned carbon because of inefficient mixing between the strong air jets and char particles. Based on these ideal cases, the actual air distribution can be adjusted depending on the coal properties such as the ash slagging propensity.

Suggested Citation

  • Hyunbin Jo & Kiseop Kang & Jongkeun Park & Changkook Ryu & Hyunsoo Ahn & Younggun Go, 2019. "Optimization of Air Distribution to Reduce NOx Emission and Unburned Carbon for the Retrofit of a 500 MWe Tangential-Firing Coal Boiler," Energies, MDPI, vol. 12(17), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3281-:d:261107
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    References listed on IDEAS

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    1. Wu, Xiaofeng & Fan, Weidong & Liu, Yacheng & Bian, Bao, 2019. "Numerical simulation research on the unique thermal deviation in a 1000 MW tower type boiler," Energy, Elsevier, vol. 173(C), pages 1006-1020.
    2. Ma, Lun & Fang, Qingyan & Tan, Peng & Zhang, Cheng & Chen, Gang & Lv, Dangzhen & Duan, Xuenong & Chen, Yiping, 2016. "Effect of the separated overfire air location on the combustion optimization and NOx reduction of a 600MWe FW down-fired utility boiler with a novel combustion system," Applied Energy, Elsevier, vol. 180(C), pages 104-115.
    3. Li, Sen & Xu, Tongmo & Hui, Shien & Wei, Xiaolin, 2009. "NOx emission and thermal efficiency of a 300Â MWe utility boiler retrofitted by air staging," Applied Energy, Elsevier, vol. 86(9), pages 1797-1803, September.
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    Cited by:

    1. Hyunbin Jo & Jongkeun Park & Woosuk Kang & Junseok Hong & Sungmin Yoon & Howon Ra & Changkook Ryu, 2021. "Influence of Uneven Secondary Air Supply and Burner Tilt on Flow Pattern, Heat Transfer, and NOx Emissions in a 500 MWe Tangential-Firing Coal Boiler," Energies, MDPI, vol. 14(24), pages 1-18, December.
    2. Bartłomiej Hernik, 2020. "Numerical Research of the Modification of the Combustion System in the OP 650 Boiler," Energies, MDPI, vol. 13(3), pages 1-22, February.
    3. Yuan, Zhenhua & Chen, Zhichao & Zhang, Bo & Gao, Xuelin & Li, Jiawei & Qiao, Yanyu & Li, Zhengqi, 2023. "Study on the slagging trends of the pre-combustion chamber in industrial pulverized coal boiler under different excess air coefficients by CFD numerical simulation," Energy, Elsevier, vol. 264(C).
    4. Andrey Rogalev & Nikolay Rogalev & Vladimir Kindra & Ivan Komarov & Olga Zlyvko, 2021. "Research and Development of the Oxy-Fuel Combustion Power Cycles with CO 2 Recirculation," Energies, MDPI, vol. 14(10), pages 1-18, May.
    5. Aliya Askarova & Saltanat Bolegenova & Valeriy Maximov & Symbat Bolegenova & Nariman Askarov & Aizhan Nugymanova, 2021. "Computer Technologies of 3D Modeling by Combustion Processes to Create Effective Methods of Burning Solid Fuel and Reduce Harmful Dust and Gas Emissions into the Atmosphere," Energies, MDPI, vol. 14(5), pages 1-22, February.
    6. Jiseok Lee & Seunghan Yu & Jinje Park & Hyunbin Jo & Jongkeun Park & Changkook Ryu & Yeong-gap Jeong, 2020. "Reduction of Unburned Carbon Release and NO x Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal," Energies, MDPI, vol. 13(19), pages 1-17, September.

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