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The effects of Na2O/K2O flux on ash fusion characteristics for high silicon-aluminum coal in entrained-flow bed gasification

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Listed:
  • Li, Fenghai
  • Yang, Ziqiang
  • Li, Yang
  • Han, Guopeng
  • Fan, Hongli
  • Liu, Xuefei
  • Xu, Meiling
  • Guo, Mingxi
  • Fang, Yitian

Abstract

Composite additives are widely used to regulate coal ash fusion characteristics to meet the requirement of entrained-flow bed gasification. In this paper, the effects and corresponding mechanisms of the Na2O/K2O ratio on ash fusion behavior of high silicon-aluminum coal (Jincheng coal, JC) were investigated. The results showed that at the same total mass fractions of Na2O and K2O (15%), the JC ash fusion temperatures (AFTs) decreased quickly and then increased slowly with increasing Na2O/K2O ratio, the lowest AFT reached when Na2O/K2O ratio was at 9/6. The variations in volume and morphology of mixed JC ashes during heating indicated the AFT variation. The mineral change from KAlSi2O6 (MP: 1686 °C) to NaAlSiO4 (MP: 1100 °C) with increasing Na2O/K2O mass ratio mainly resulted in a decrease in the AFT. This indicated that the Na2O/K2O synergy flux effect was related to the formation of a NaAlSiO4–KAlSiO4 eutectic structure. The AFT variation with increasing Na2O/K2O ratio was also explained by the fact that a quick increase and then a slow decrease in the temperature at which all solid phase changes into liquid-phase was calculated by FactSage.

Suggested Citation

  • Li, Fenghai & Yang, Ziqiang & Li, Yang & Han, Guopeng & Fan, Hongli & Liu, Xuefei & Xu, Meiling & Guo, Mingxi & Fang, Yitian, 2023. "The effects of Na2O/K2O flux on ash fusion characteristics for high silicon-aluminum coal in entrained-flow bed gasification," Energy, Elsevier, vol. 282(C).
    • Handle: RePEc:eee:energy:v:282:y:2023:i:c:s0360544223019977
    DOI: 10.1016/j.energy.2023.128603
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