流化床O_2/CO_2燃烧(Ⅴ)-褐煤的高氧浓度燃烧优化  

O_2/CO_2 Combustion in a Fluidized Bed(Ⅴ)-Optimization of Lignite Combustion at a High Oxygen Concentration

作　　者：赵科[1] 谭力[1] 段翠九[1] 吕清刚[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190

出　　处：《热能动力工程》2013年第2期158-163,217-218,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金项目(50906084);中国科学院知识创新工程重要方向项目(KGCX2-YX-399+3);中国博士后科学基金(20090450578)

摘　　要：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%。When combustion at a high oxygen concentration takes place in a circulating fluidized bed,the thermal fragmentation and combustion characteristics of lignite will change.To optimize the combustion of lignite at a high oxygen concentration,the influence of the primary air oxygen concentration and the secondary air flow proportion on the combustion stability,pollutant formation characteristics and combustion efficiency was studied in a 0.15 MW circulating fluidized bed test system.The test results show that lignite can realize a stable combustion when the oxygen concentration of the primary air ranges from 44.3% to 55.3% and that of the secondary air is between 43.2% and 60.2%.Under the condition of different air distributions,the conversion rate of the nitrogen in the coal to N2O is in a range from 4.2% to 6.2% while that of the nitrogen to NOx ranges from 4.2% to 8.3% and that of the sulfur in the coal to S2O is between 48% and 62%.When the oxygen concentration of the primary air is 50.4%,that of the secondary air is 50.5% and the flow proportion of the secondary air is 40%,such a case is regarded as the optimum operating condition for lignite,under which the combustion efficiency will be 94.09%,the conversion rate of nitrogen in the coal to N2O 5.4% and that to NOx 4.2%.

关 键 词：流化床 O2 CO2燃烧 N2O NOx 

分 类 号：TK16[动力工程及工程热物理—热能工程]