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循环流化床能实现高氧气浓度下的O2/CO2燃烧,进而减少燃烧室尺寸并降低再循环烟气量。本研究使用两种烟煤、一种褐煤,分别在15 kW循环流化床试验系统和0.15MW循环流化床试验系统上进行试验,研究了氧气浓度对NOx和N2O的影响。结果表明,3个煤种均在一次风氧气浓度44.3%～55.3%、二次风氧气浓度43.2%～60.2%下实现稳定燃烧。氧气浓度约50%燃烧时,煤中氮向NOx的转化率降低到空气气氛燃烧的19%～60%,煤中氮向N2O的转化率降低到空气气氛燃烧的20%～81%。
Circulating fluidized beds enable O2 / CO2 combustion at high oxygen concentrations, thereby reducing the size of the combustion chamber and reducing the amount of recirculated flue gas. In this study, two types of bituminous coal, a kind of lignite, were tested on 15 kW circulating fluidized bed test system and 0.15MW circulating fluidized bed test system to study the effect of oxygen concentration on NOx and N2O. The results showed that all the three coal species achieved stable combustion with primary oxygen concentration of 44.3% -55.3% and secondary oxygen concentration of 43.2% -60.2%. When the oxygen concentration is about 50%, the conversion of nitrogen to NOx in coal is reduced to 19-60% of the combustion in the air atmosphere, and the conversion of nitrogen to N2O in coal is reduced to 20-81% of the combustion in the air atmosphere.