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Transformation characteristics of sodium, chlorine and sulfur of Zhundong coal during O2/CO2 combustion in circulating fluidized bed

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  • Liu, Dianbin
  • Li, Wei
  • Li, Shiyuan
  • Song, Wenhao
  • Liu, Daofeng
  • Kong, Runjuan

Abstract

Transformation characteristics of sodium, sulfur and chlorine during the high-sodium Zhundong coal combustion were investigated by performing both air combustion and O2/CO2 combustion experiments in a 50 kW circulating fluidized bed testing system. Via analyzing the chemical compositions and crystalline phases of ash samples, the following results were obtained. In comparison with air combustion, sodium release into gas phase was inhibited under O2/CO2 combustion atmosphere at the identical oxygen concentrations. While increasing the inlet oxygen concentration under O2/CO2 combustion could promote the release of sodium. Chlorine almost finished total release from the coal under all experimental conditions. Besides, sulfation reaction affected the transformation of sodium, sulfur and chlorine markedly, for it could alter the chemical form of sodium from chloride to sulfate and further influence the release and condensation process of sodium during the combustion process. In particular, elevating the inlet oxygen concentration could promote the sulfation reaction and reduce the content of chlorine in deposits significantly.

Suggested Citation

  • Liu, Dianbin & Li, Wei & Li, Shiyuan & Song, Wenhao & Liu, Daofeng & Kong, Runjuan, 2019. "Transformation characteristics of sodium, chlorine and sulfur of Zhundong coal during O2/CO2 combustion in circulating fluidized bed," Energy, Elsevier, vol. 185(C), pages 254-261.
    • Handle: RePEc:eee:energy:v:185:y:2019:i:c:p:254-261
    DOI: 10.1016/j.energy.2019.07.043
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    References listed on IDEAS

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    1. Tan, Y. & Jia, L. & Wu, Y. & Anthony, E.J., 2012. "Experiences and results on a 0.8MWth oxy-fuel operation pilot-scale circulating fluidized bed," Applied Energy, Elsevier, vol. 92(C), pages 343-347.
    2. Davison, John, 2007. "Performance and costs of power plants with capture and storage of CO2," Energy, Elsevier, vol. 32(7), pages 1163-1176.
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