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Fine ash formation during pulverized coal combustion - A comparison of O2/CO2 combustion versus air combustion

Sheng, C., Lu, Y., Gao, X.ORCID: 0000-0003-2491-8169 and Yao, H. (2007) Fine ash formation during pulverized coal combustion - A comparison of O2/CO2 combustion versus air combustion. Energy & Fuels, 21 (2). pp. 435-440.

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The present paper was addressed toward the impact of O2/CO2 combustion on mineral transformation and fine ash formation. A high-aluminum coal was burned with an O2/CO2 mixture in a drop tube furnace. The collected ash samples were characterized in details to study the ash formation behaviors, and the comparison was made between O2/CO2 combustion and air combustion. It was found that boehmite transformed to θ-Al2O3 and then to α-Al2O3 and the extent of the transformation depended upon the residence time and more significantly upon the particle combustion temperature. In comparison to air combustion, O2/CO2 combustion did not affect the species of mineral phases formed in the ashes of the coal studied but did affect the relative amounts of the phases. O2/CO2 combustion had an impact on the coal particle combustion temperature and consequently on the ash mineral composition. O2/CO2 combustion decreased the yields of the fine ash particles in both the submicrometer fume region and fine fragmentation region as compared to air combustion with the same O2 concentration because of the decrease in the particle combustion temperature, while an increasing O2 concentration enhanced the formation of both region particles. The mode size of submicrometer particles formed in O2/CO2 combustion was found shifting to a smaller size when compared to that in air combustion.

Item Type: Journal Article
Publisher: American Chemical Society
Copyright: © 2007 American Chemical Society
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