O2/CO2 coal combustion characteristics in a 50 kWth circulating fluidized bed
O2/CO2 coal combustion characteristics in a 50 kWth circulating fluidized bed
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DOI：
10.1016/j.ijggc.2011.01.007
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发表时间：
2011-07
影响因子：
3.9
通讯作者：
L. Duan;Changsui Zhao;Wu Zhou;Chengrui Qu;Xiaoping Chen
中科院分区：
文献类型：
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作者：
L. Duan;Changsui Zhao;Wu Zhou;Chengrui Qu;Xiaoping Chen
在50 kW循环流化床（CFB）燃烧器上进行了两种国产煤在空气和O2/CO2气氛下的燃烧试验，研究了气氛和O2分级对燃烧特性（温度分布、燃烧效率、气态污染物排放和脱硫效率）的影响。结果表明，大气中富氧提高了提升管内的温度水平，提高了燃烧效率。在不添加石灰石的情况下，大气中O2的富集增加了SO2和NO的排放，减少了CO的排放。在O2/CO2气氛下，相同Ca/S摩尔比的条件下，O2浓度越高，脱硫效率越高。O2分级为富氧燃料CFB燃烧提供了更大的操作灵活性。随着一次烟气中O2浓度的增加，燃烧效率和脱硫效率提高。在O2/CO2气氛下，O2分级可以在很大程度上降低NO的排放。
Combustion experiments of two Chinese coals were conducted in a 50kWthcirculating fluidized bed (CFB) combustor in air and O2/CO2atmospheres, and the effects of atmosphere and O2staging on combustion characteristics including temperature distribution profiles, combustion efficiency, gaseous pollutant emission and desulfurization efficiency were investigated. Results show that O2enrichment in the atmosphere elevates the temperature level in the riser and improves the combustion efficiency. Without limestone addition, O2enrichment in the atmosphere augments SO2and NO emission and reduces CO emission. The desulfurization efficiency under higher O2concentration is higher with the same Ca/S molar ratio in O2/CO2atmosphere. O2staging provides more operation flexibility for oxy-fuel CFB combustion. As O2concentration in the primary gas increases, combustion efficiency and desulfurization efficiency are improved. O2staging can reduce the NO emission to a large extent in O2/CO2atmosphere.