O_2/CO_2气氛下不同密度煤粉燃烧特性研究  

STUDY OF DIFFERENT DENSITIES PULVERIZED COAL COMBBUSTION CHARACTERISTICS UNDER O_2/CO_2 ATMOSPHERE

作　　者：吴乐[1] 徐明厚[1] 王晟孚[1] 姚洪[1] 乔瑜[1] 胡勇[2] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [2]湖北省黄冈市特种设备检验所,湖北黄冈438000

出　　处：《工程热物理学报》2010年第10期1789-1792,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50720145604;No.50721005;No.50906029)

摘　　要：本文将大同烟煤分为低(<1.4 g/cm^3)、中(1.4～2.0 g/cm^3)、高(>2.0 g/cm^3)3个密度段,进行不同密度原煤的工业和元素分析,利用热重分析仪研究了O_2/N_2、O_2/CO_2气氛(不同氧气浓度下)各样品的燃烧特性,并开展了反应动力学分析。结果显示在O_2/CO_2气氛下,随煤粉密度增加,煤粉最大失重速率减小,最大放热速率减小,燃尽温度升高;提高氧气浓度可降低燃尽温度。与O_2/N_2气氛相比,在氧气浓度相同的条件下,各样品在O_2/CO_2气氛下的着火温度、燃尽温度、表观活化能均升高。Datong bituminous coal was separated into three density fractions, the light（〈1.4 g/cm^3）, the medium（1.4-2.0 g/cm^3） and the heavy （〉2.0 g/cm^3）.The proximate and ultimate analyses of samples were studied. The combustion characteristics and reaction kinetics of the samples under O2/N2 and O2/CO2 atmosphere （different oxygen concentration）were investigated by utilizing thermal gravimetric analysis. It was showed that under O2/CO2 atmosphere with the increase of coal density, the maximum weight loss rate and maximum heat release rate both decreases, but burnout temperature increase. The burnout temperature can be reduced by increasing the oxygen concentration. Under O2/CO2 atmosphere, the pulverized coal ignition temperature, burnout temperature, and apparent activation energy were all higher than those under O2/N2 conditions（the same oxygen concentration）.

关 键 词：烟煤 密度 O2/CO2气氛 燃烧特性 

分 类 号：TQ534[化学工程—煤化学工程]