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Retrofit of a 600 MW Down-Fired Pulverized-Coal Furnace for Low NOx Emission

Author

Listed:
  • Tao Liu

    (State Key Laboratory of Low-Carbon Smart Coal-Fired Power Generation and Ultra-Clean Emission, Nanjing 210023, China
    China Energy Science and Technology Research Institute Co., Ltd., Nanjing 210023, China)

  • Sheng Wang

    (State Key Laboratory of Low-Carbon Smart Coal-Fired Power Generation and Ultra-Clean Emission, Nanjing 210023, China
    China Energy Science and Technology Research Institute Co., Ltd., Nanjing 210023, China)

  • Ziming Wei

    (State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Jie Yu

    (State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

Aiming at solving the problem of high NOx emissions of a down-fired boiler, a new combustion system has been proposed by means of the numerical simulation using Ansys Fluent. The coal-lean stream (tertiary air), which was originally mixed with a separated overfired air (SOFA) stream on the front and rear walls of the upper furnace, was relocated to the lower zone of the furnace after retrofit. The secondary-air slots were transformed into a new annular port type, which was injected into the furnace with a down-tilt angle to increase the residence time of the coal stream. Furthermore, the effect of secondary air distribution and velocity of coal stream on performance was studied. After retrofitting the combustion system, the NO emissions were effectively controlled, decreasing from 906 mg Nm −3 to 576 mg Nm −3 , but the carbon content of fly ash increased from 2.46% to 5.78%. Aiming at decreasing the carbon content of fly ash, the effect of coal/primary air velocity on the arch was studied. Less carbon content in fly ash can be observed for the lower arch airflow velocity. The results showed that the NO emissions can be controlled below 595 mg Nm −3 , and the carbon content of fly ash was reduced to 3.39% when the velocity was decreased to 18 m s −1 .

Suggested Citation

  • Tao Liu & Sheng Wang & Ziming Wei & Jie Yu, 2023. "Retrofit of a 600 MW Down-Fired Pulverized-Coal Furnace for Low NOx Emission," Energies, MDPI, vol. 16(19), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6837-:d:1248808
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    References listed on IDEAS

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    1. 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).
    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. Wang, Qingxiang & Chen, Zhichao & Han, Hui & Zeng, Lingyan & Li, Zhengqi, 2019. "Experimental characterization of anthracite combustion and NOx emission for a 300-MWe down-fired boiler with a novel combustion system: Influence of primary and vent air distributions," Applied Energy, Elsevier, vol. 238(C), pages 1551-1562.
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