Inner Relationship between CO, NO, and Hg in a 6 kWth Circulating Fluidized Bed Combustor under an O2/CO2 Atmosphere

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• 作者：Hui Wang ; Yufeng Duan ; Ya-ning Li ; Yuan Xue ; Meng Liu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：May 19, 2016
• 年：2016
• 卷：30
• 期：5
• 页码：4221-4228
• 全文大小：469K
• 年卷期：0
• ISSN：1520-5029

文摘

Combustion experiments of semianthracite coal were conducted on a 6 kW_th oxy-fuel circulating fluidized bed combustor. The inner relationship between CO, NO, and Hg in the combustor under an O₂/CO₂ atmosphere was explored. The results demonstrate that all temperatures are lower under a 21% O₂/79% CO₂ atmosphere than those under an air atmosphere. In oxy-coal combustion, the increasing oxygen concentration can increase CO emission. NO emission in oxy-coal is much lower than that in air combustion as a result of coal particle combustion generating less oxygen status under a 21% O₂/79% CO₂ atmosphere. The percentage of mercury oxidation is higher under air–coal combustion than that under 21% O₂/79% CO₂–coal combustion, because the specific heat of CO₂ is higher in 21% O₂/79% CO₂ than that in air. The increase of the oxygen concentration under oxy-coal combustion leads to the total reducing atmosphere decrease, which is suitable for the mercury oxidation. These results are very significant for selection of operating conditions for an oxy-coal circulating fluidized bed.