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循环流化床在高氧浓度燃烧时,褐煤的热破碎特性和燃烧特性改变,为优化褐煤在高氧气浓度下的燃烧,在0.15 MW循环流化床试验系统上研究一次风氧气浓度和二次风流量比例对燃烧稳定性、污染物生成特性和燃烧效率的影响。试验结果表明,褐煤在一次风氧气浓度44.3%～55.3%、二次风氧气浓度43.2%～60.2%范围内能实现稳定燃烧。不同配风条件下,煤中氮向N2O的转化率为4.2%～6.2%,煤中氮向NOx的转化率为4.2%～8.3%,煤中硫向SO2的转化率48%～62%。一次风氧气浓度50.4%、二次风氧气浓度50.5%、二次风流量比例40%为褐煤的燃烧最优工况,该条件下燃烧效率94.09%、煤中氮向N2O的转化率为5.4%、煤中氮向NOx的转化率为4.2%。
Circulating fluidized bed combustion at high oxygen concentrations, lignite thermal crushing characteristics and combustion characteristics change, in order to optimize the combustion of lignite at high oxygen concentrations in a 0.15 MW circulating fluidized bed test system to study the primary oxygen concentration and secondary Effect of air flow ratio on combustion stability, pollutant generation characteristics and combustion efficiency. The test results show that the lignite can achieve stable combustion in the range of 44.3% -55.3% of primary oxygen and 43.2% -60.2% of secondary oxygen. Under different air distribution conditions, the conversion of nitrogen to N2O in coal is 4.2% ~ 6.2%, the conversion of nitrogen to NOx in coal is 4.2% ~ 8.3%, and the conversion of sulfur to SO2 in coal is 48% ~ 62%. The primary oxygen concentration was 50.4%, the secondary oxygen concentration was 50.5% and the secondary air flow rate was 40%, which was the optimal combustion condition of lignite. The combustion efficiency was 94.09% and the conversion of nitrogen to N2O was 5.4% , And the conversion of nitrogen to NOx in coal is 4.2%.