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Ash characteristics of oxy-biomass combustion in a circulating fluidized bed with kaolin addition

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  • Nguyen, Hoang Khoi
  • Moon, Ji Hong
  • Jo, Sung Ho
  • Park, Sung Jin
  • Bae, Dal Hee
  • Seo, Myung Won
  • Ra, Ho Won
  • Yoon, Sang-Jun
  • Yoon, Sung-Min
  • Lee, Jae Goo
  • Mun, Tae-Young
  • Song, Byungho

Abstract

Biomass combustion in the oxy-fuel circulating fluidized bed is a promising technology to maximize the negative carbon dioxide emission and reduce pollutants emission in power plants. However, biomass ash related behaviors under oxy-combustion with kaolin additives still lack sufficient information. In this study, kaolin was used as an additive to manage ash problems during oxy-biomass combustion in a 0.1 MWth circulating fluidized bed combustion facility. Kaolin was fed at ratios of kaolin/wood pellet (wt./wt.): 0.21 and 0.25 by separately feeding or pre-mixing, respectively. The sampled ashes were characterized using X-ray fluorescence and X-ray diffraction analysis. Additionally, the potassium capture performance, slagging and fouling indices, attrition characteristics, and strength were also evaluated. The results revealed that potassium capture performance was improved by up to 24% at the ratio of kaolin/wood pellet (0.25) and kalsilite (KAlSiO4) within ash increased by adsorption on the metakaolin surface of gaseous potassium. The fouling formation decreased from 0.43 without kaolin to 0.07–0.15 with kaolin. In terms of oxy-fuel operation, SO2 emission was decreased when kaolin used, performing a high CO2 concentration of over 93 vol% and combustion efficiency of over 99%.

Suggested Citation

  • Nguyen, Hoang Khoi & Moon, Ji Hong & Jo, Sung Ho & Park, Sung Jin & Bae, Dal Hee & Seo, Myung Won & Ra, Ho Won & Yoon, Sang-Jun & Yoon, Sung-Min & Lee, Jae Goo & Mun, Tae-Young & Song, Byungho, 2021. "Ash characteristics of oxy-biomass combustion in a circulating fluidized bed with kaolin addition," Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:energy:v:230:y:2021:i:c:s0360544221011191
    DOI: 10.1016/j.energy.2021.120871
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    3. Xu, Ming-xin & Zhang, Xin-yu & Zhang, Ping-xin & Di, Jin-yi & Ji, Hai-wen & Meng, Xiang-xi & Lu, Qiang, 2023. "The interactive effects of operating parameters on ash slagging during oxy-biomass combustion based on response surface methodology," Energy, Elsevier, vol. 277(C).

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