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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

Author

Listed:
  • Chen, Zhichao
  • Qiao, Yanyu
  • Guan, Shuo
  • Wang, Zhenwang
  • Zheng, Yu
  • Zeng, Lingyan
  • Li, Zhengqi

Abstract

This study proposes changing the inner and outer secondary air ratios (RSA) under sub-stoichiometric (sub-SR) conditions to optimize the burn-out performance and reduce the NOx emissions of a swirl burner. The ignition and combustion characteristics, NOx formation, and the effect of RSA on the carbon and nitrogen conversion processes under sub-SR (SR = 0.85) were investigated via thermal tests carried out in a 0.5 MWe pulverized coal-fired furnace. The fuel-rich flow in the center of the furnace was further rearward than the fuel-lean flow. The pulverized coal burnt rapidly after entering the furnace. The average percentage of unburned carbon was less than 15% in the x/d = 3.5 (x is the axial direction distance, and d is the diameter of the burner) section away from the burner. The N to NO conversion at the beginning of combustion (x/d < 3.5) was effectively suppressed in the swirl burner under sub-SR conditions. The NO reduction reaction almost completely stopped after x/d > 11.5. RSA mainly affected the combustion characteristics and NOx generation characteristics of pulverized coal by changing the degree of air staging at different positions in the furnace. Larger RSA values meant a greater amount of oxygen involved in the early combustion. This accelerated the early burn-out of pulverized coal and the release of elements, increasing NOx emissions. This study recommends RSA values between 0.7 and 1, that the over-fire air (OFA) nozzle be positioned behind the near burner region (x/d > 3.5) for the combustion of bituminous coal to minimize NOx emissions and unburned carbon.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pd:s0360544221026724
    DOI: 10.1016/j.energy.2021.122423
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    4. Li, Zhengqi & Liu, Zheng & Huang, Haolin & Du, He & Chen, Zhichao, 2024. "The effects of key parameters on the gas/particle flows characteristics in the furnace of a Foster Wheeler down-fired boiler retrofitted with novel low-load stable combustion technology," Energy, Elsevier, vol. 288(C).

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