O_2/CO_2气氛下煤与生物质混燃NO_x的排放特性  

NO_x Emission Characteristics of Coal and Biomass Co-firing in O_2/CO_2 Atmosphere

作　　者：王廷旭 匡思维[2] 方庆艳[1,2] 马仑[2] 张成[1,2] 陈刚[1,2] 

机构地区：[1]华中科技大学中欧清洁与可再生能源学院,武汉硕士生430070 [2]华中科技大学煤燃烧国家重点实验室,武汉硕士生430070

出　　处：《煤炭转化》2017年第2期36-41,共6页Coal Conversion

基　　金：国家自然科学基金资助项目(51676076)

摘　　要：在滴管炉上研究不同煤种(褐煤、烟煤、贫煤和无烟煤)与生物质(稻壳)混燃NO_x的排放特性,分析不同燃烧气氛、生物质掺混比例和氧气体积分数对混燃NO_x排放特性的影响.结果表明:在20%O_2/80%N_2气氛下,不同煤种和生物质混燃时,NO_x沿程分布均呈现出先增大后减小的变化趋势,烟煤/稻壳的NO_x排放量最高;在氧气体积分数为20%条件下,O_2/CO_2气氛比O_2/N_2气氛下NO_x的排放量降低;在30%O_2/70%CO_2气氛下,随着混燃中生物质掺混比例的增加,不同煤种NO_x的排放量逐渐降低,褐煤的NO_x排放量下降最显著,由130.029mg/m^3下降到49.674mg/m^3;在O_2/CO_2气氛下,随着氧气体积分数的升高,NO_x排放量增加.氧气体积分数由20%升高到30%,烟煤单燃时NO_x排放的增加量较小,生物质和烟煤混燃时NO_x排放的增加量较大.NOx emission characteristics of different kinds of coal（lignite,bituminous coal,lean coal and anthracite）/biomass（rice husks）blends combustion were studied using drop tube furnace.The effects of atmosphere,blending ratio of biomass,oxygen volume fraction on NOxemission characteristics were investigated in details.Experimental results show that：NOx emissions present a trend of firstly increasing and then decreasing for different coal/biomass blends along the furnace height.NOx emission of bituminite/rice husk co-combustion is the highest in the atmosphere of 20%O2/80%N2.NOxemission in O2/CO2 atmosphere is lower than that in O2/N2 atmosphere in the condition of 20% oxygen volume fraction;with increasing of the blending ratio of biomass,NOxemission gradually decreases,and that decreases most significantly for the lignite and biomass co-combustion,which decreases from 130.029mg/m^3 to 49.674mg/m^3 in the atmosphere of 20%O2/70%CO2;with the oxygen volume fraction increases,NOxemission increases.When the oxygen volume fraction increases from 20%to 30%in O2/CO2 atmosphere,the increase of NOxemisson of bituminous coal reduces,however the increase of NOxemission of rice husk/bituminite co-firing improves.

关 键 词：生物质 混燃 O2/CO2气氛 滴管炉 NOX排放 

分 类 号：TQ534[化学工程—煤化学工程] X792[环境科学与工程—环境工程]