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Experimental study on NO emission and ash deposition during oxy-fuel combustion of high-alkali coal under oxygen-staged conditions

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  • Wang, Chang'an
  • Zhao, Lin
  • Sun, Ruijin
  • Zhou, Lei
  • Jin, Liyan
  • Che, Defu

Abstract

The oxygen-staged combustion is an effective strategy to reduce NO emission, but its effects on ash deposition in oxy-fuel combustion of Zhundong high-alkali coal still remain unclear. This paper simultaneously focused on the NO emission and ash deposition during the oxygen-staged oxy-fuel combustion of Zhundong coal using a vertical two-stage furnace system. The air- and oxygen-staged combustion were compared and the impacts of oxygen content and stoichiometric ratio in primary zone (SR1) in oxygen-staged combustion were further evaluated. The results show that compared to air-staged combustion, the oxygen-staged case in oxy-fuel combustion leads to smaller conversion ratio of fuel-N to NO (XNO) and smaller mass of ash deposit. Under oxygen-staged conditions, both the XNO and deposit mass have an upward trend as the oxygen content increases (15%–50%). About 20 mg more ash could be collected for every 10% increase in oxygen content. The XNO increases when SR1 gets elevated from 0.5 to 1.2, however, the deposit mass exhibits a downtrend at SR1 ≤ 0.9 and becomes nearly independent of oxygen supply when the SR1 further increases. The SR1 of 0.9 is a reasonable choice, and some measures should be taken to alleviate the ash-related problems if smaller SR1 is needed.

Suggested Citation

  • Wang, Chang'an & Zhao, Lin & Sun, Ruijin & Zhou, Lei & Jin, Liyan & Che, Defu, 2022. "Experimental study on NO emission and ash deposition during oxy-fuel combustion of high-alkali coal under oxygen-staged conditions," Energy, Elsevier, vol. 251(C).
    • Handle: RePEc:eee:energy:v:251:y:2022:i:c:s0360544222007782
    DOI: 10.1016/j.energy.2022.123875
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