O₂/CO₂ coal combustion characteristics in a 50 kW_th circulating fluidized bed

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• 作者：Lunbo Duan ; ^a ; ^{duanlunbo@seu.edu.cn"" rel=""nofollow} ; Changsui Zhao^a ; Wu Zhou^a ; Chengrui Qu^a ; Xiaoping Chen^a
• 关键词：O₂/CO₂ combustion ; Circulating fluidized bed ; Combustion efficiency ; Desulfurization efficiency ; O₂ staging
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：5
• 期：4
• 页码：770-776
• 全文大小：591 K

文摘

Combustion experiments of two Chinese coals were conducted in a 50 kW_th circulating fluidized bed (CFB) combustor in air and O₂/CO₂ atmospheres, and the effects of atmosphere and O₂ staging on combustion characteristics including temperature distribution profiles, combustion efficiency, gaseous pollutant emission and desulfurization efficiency were investigated. Results show that O₂ enrichment in the atmosphere elevates the temperature level in the riser and improves the combustion efficiency. Without limestone addition, O₂ enrichment in the atmosphere augments SO₂ and NO emission and reduces CO emission. The desulfurization efficiency under higher O₂ concentration is higher with the same Ca/S molar ratio in O₂/CO₂ atmosphere. O₂ staging provides more operation flexibility for oxy-fuel CFB combustion. As O₂ concentration in the primary gas increases, combustion efficiency and desulfurization efficiency are improved. O₂ staging can reduce the NO emission to a large extent in O₂/CO₂ atmosphere.