煤焦加速着火及燃烧特性研究  

Accelerating Ignition and Combustion Properties of Coal Char

作　　者：张斌[1] 傅培舫[1] 刘洋[1] 岳芳[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《燃烧科学与技术》2016年第2期130-135,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51076050)

摘　　要：通过热重和差示扫描量热(TG-DSC)同步热分析仪,分别在空气气氛及富氧条件下,研究3种焦样燃烧过程的质量变化和热效应.得出空气气氛下,随着加热速率的增加,释热速率曲线的峰值增加,最大释热速率对应的温度则出现滞后,最大释热加速度对应的温度max()aT增加,加速度峰值(amax)也随之增加;maxaT越低,amax越高,表明煤焦活性越高.富氧条件下,随着氧气体积分数从21%,增加至100%,,最大释热速率逐渐增大,释热速率曲线呈现出越来越高及窄的趋势,maxaT呈现出下降的趋势,amax呈上升趋势;相同氧体积分数下(21%),空气气氛amax值大于富氧条件下的值,说明焦样在空气条件下的反应活性较高,随着煤阶的增加,maxaT增大,amax递减,表明煤焦反应活性逐渐降低.The combustion characteristics of three different char samples were investigated by using differentialscanning calorimeter（DSC）and thermogravimetry analysis（TG） in order to research the mass change and heat effectof char combustion.Under the air atmosphere,the peak value of DSC curve increases with heating rates increasing,while the temperature corresponding to the maximum rate of heat release shows a delay time,the temperature correspondingto the maximum acceleration of heat release（Tamax） and the peak value of acceleration（amax）increase as heatingrates increase.AsTamax decreases and amax increases,the reactivity of coal char increases.Under the oxy-fuelcombustion,as the oxygen volume concentration increases from 21%, to 100%,the maximum rate of heat releaseincreases,DSC curve gets higher and narrower,Tamax tends to decline,while amax tends to increase.Under thesame oxygen volume concentration（21%）,the value of amax in air is greater than that in oxy-fuel,which shows thatthe reactivity of char in air is higher than that in oxy-fuel combustion,and with the increase of coal rank,maxaT increasesand amax declines,indicating a decrease in the reactivity of coal char.

关 键 词：煤焦燃烧 热重和差示扫描量热仪 加热速率 富氧燃烧 加速着火 

分 类 号：TQ531.9[化学工程—煤化学工程]