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Influence of various air-staging on combustion and NOX emission characteristics in a tangentially fired boiler under the 50% load condition

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  • Jiang, Yu
  • Lee, Byoung-Hwa
  • Oh, Dong-Hun
  • Jeon, Chung-Hwan

Abstract

Deep-air-staged combustion technology has been extensively used in coal-fired boilers under full-load conditions, which can help reduce the formation of nitrogen oxides (NOX). In this study, different proportions of deep-air-staging classification tests were conducted in a 550-MW tangentially fired boiler under a 50% load condition. To achieve a flexible adjustment of the boiler load, numerical simulations were conducted to evaluate the flow field distribution, combustion characteristics, and NOX emissions in a boiler under various air-staging configuration combustion conditions. The prediction results show that with an increase in the over-fire air (OFA) flow rate (i.e., close-coupled OFA (CCOFA) or separate OFA (SOFA)), the burner zone stoichiometric ratios are decreased, which is extremely important for improving the degree of burnout and reducing the NOX emissions. SOFA has a wall nozzle to better penetrate the updraft, and is thus better than the CCOFA effect in terms of coal burnout. SOFA also achieves a better pollutant emission reduction than CCOFA, and CCOFA plays a vital role in the combustion stability of a boiler combustion system. Finally, field measurements verified the effectiveness of the optimized air-staging classification scheme, which improved the combustion characteristics compared to a scheme without air-staging classification.

Suggested Citation

  • Jiang, Yu & Lee, Byoung-Hwa & Oh, Dong-Hun & Jeon, Chung-Hwan, 2022. "Influence of various air-staging on combustion and NOX emission characteristics in a tangentially fired boiler under the 50% load condition," Energy, Elsevier, vol. 244(PB).
    • Handle: RePEc:eee:energy:v:244:y:2022:i:pb:s0360544222000706
    DOI: 10.1016/j.energy.2022.123167
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