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Influence of primary air ratio on flow and combustion characteristics and NOx emissions of a new swirl coal burner

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  • Jing, Jianping
  • Li, Zhengqi
  • Zhu, Qunyi
  • Chen, Zhichao
  • Ren, Feng

Abstract

Cold airflow experiments on a small-scale burner model, as well as in situ experiments on a centrally fuel-rich swirl coal combustion burner were conducted. Measurements were taken from within a 300 MWe wall-fired pulverized-coal utility boiler installed with eight of centrally fuel-rich swirl coal combustion burners in the bottom row of the furnace during experiments. Various primary air ratios, flow characteristics, gas temperature and gas species concentrations in the burner region were measured. The results of these analyses show that with decreasing primary air ratio, the swirl intensity of air, divergence angles and maximum length and diameter of the central recirculation zone all increased, and the turbulence intensity of the jet flow peaked but decayed quickly. In the burner nozzle region, gas temperature, temperature gradient and CO concentration increased with decreasing primary air ratio, while O2 and NOx concentration decreased. Different primary air ratios, the gas temperatures and gas species concentrations in the side-wall region varied slightly.

Suggested Citation

  • Jing, Jianping & Li, Zhengqi & Zhu, Qunyi & Chen, Zhichao & Ren, Feng, 2011. "Influence of primary air ratio on flow and combustion characteristics and NOx emissions of a new swirl coal burner," Energy, Elsevier, vol. 36(2), pages 1206-1213.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:2:p:1206-1213
    DOI: 10.1016/j.energy.2010.11.025
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    1. Fan, Weidong & Li, Youyi & Lin, Zhengchun & Zhang, Mingchuan, 2010. "PDA research on a novel pulverized coal combustion technology for a large utility boiler," Energy, Elsevier, vol. 35(5), pages 2141-2148.
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    5. Qiao, Yanyu & Li, Song & Jing, Xinjing & Chen, Zhichao & Fan, Subo & Li, Zhengqi, 2022. "Combustion and NOx formation characteristics from a 330 MWe retrofitted anthracite-fired utility boiler with swirl burner under deeply-staged-combustion," Energy, Elsevier, vol. 258(C).
    6. Chen, Zhichao & Li, Zhengqi & Wang, Zhenwang & Liu, Chunlong & Chen, Lizhe & Zhu, Qunyi & Li, Yuan, 2011. "The influence of distance between adjacent rings on the gas/particle flow characteristics of a conical rings concentrator," Energy, Elsevier, vol. 36(5), pages 2557-2564.
    7. Li, Zixiang & Miao, Zhengqing & Shen, Xusheng & Li, Jiangtao, 2018. "Effects of momentum ratio and velocity difference on combustion performance in lignite-fired pulverized boiler," Energy, Elsevier, vol. 165(PA), pages 825-839.
    8. 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).
    9. Yonmo Sung & Seungtae Kim & Byunghwa Jang & Changyong Oh & Taeyun Jee & Soonil Park & Kwansic Park & Siyoul Chang, 2021. "Nitric Oxide Emission Reduction in Reheating Furnaces through Burner and Furnace Air-Staged Combustions," Energies, MDPI, vol. 14(6), pages 1-15, March.
    10. Dios, M. & Souto, J.A. & Casares, J.J., 2013. "Experimental development of CO2, SO2 and NOx emission factors for mixed lignite and subbituminous coal-fired power plant," Energy, Elsevier, vol. 53(C), pages 40-51.
    11. Zeng, Lingyan & Li, Zhengqi & Zhao, Guangbo & Li, Jing & Zhang, Fucheng & Shen, Shanping & Chen, Lizhe, 2011. "The influence of swirl burner structure on the gas/particle flow characteristics," Energy, Elsevier, vol. 36(10), pages 6184-6194.
    12. Chen, Zhichao & Wang, Zhenwang & Li, Zhengqi & Xie, Yiquan & Ti, Shuguang & Zhu, Qunyi, 2014. "Experimental investigation into pulverized-coal combustion performance and NO formation using sub-stoichiometric ratios," Energy, Elsevier, vol. 73(C), pages 844-855.
    13. Chen, Zhichao & Qiao, Yanyu & Guan, Shuo & Wang, Zhenwang & Zheng, Yu & Zeng, Lingyan & Li, Zhengqi, 2022. "Effect of inner and outer secondary air ratios on ignition, C and N conversion process of pulverized coal in swirl burner under sub-stoichiometric ratio," Energy, Elsevier, vol. 239(PD).

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