邯钢喷吹用煤的TG-FTIR热解研究

来源期刊：钢铁2009年第11期

论文作者：王竹民 吕庆 刘然 刘二浩 王成立

文章页码：21 - 24

关键词：高炉； 喷煤； 热解； TG-FTIR

Key words：blast furnace； pulverized coal； pyrolysis； TG-FTIR

摘    要：采用TG-FTIR联用技术研究了邯钢喷吹用煤的热解失重过程。结果表明:长治煤、大湾煤、70%长治煤+30%大湾煤的失重过程均大致分三个阶段,450~800℃之间,TG曲线急剧下降,挥发分大量逸出。DTA曲线在590~700℃时出现峰值,煤的热解反应剧烈。分析显示长治煤添加30%比例大湾煤后失重开始温度比原煤下降13.5℃,1000℃时的失重率比长治煤的失重率增加了4.05%,说明无烟煤配加烟煤可以促进煤粉热解过程中产物的转化,有利于改善喷吹煤粉的燃烧状况。FTIR结果显示:添加30%大湾煤对煤粉在热解过程中CO的生成影响不大,CO₂则出现减少的趋势。甲烷气体的释放被集中到一定时间段内完成,且释放量有所增加。另外,配煤还促进了其他烃类气体逸出,增加了参加均相燃烧的挥发分气体比例。

Abstract: The pyrolysis process of pulverized coal of Handan Steel was investigated by simultaneous thermogravimetry-fourier transform infrared(TG-FTIR).The results indicate that process of mass loss of Changzhi coal,Changzhi coal added with 30% Dawan coal and Dawan coal could be divided into three stages.The curves of TG decreased quickly and volatiles in sample released mostly at the range of 450-800 ℃.DTA curves reached the maximum and pyrolytic reaction was violent from 590 ℃ to 700 ℃.Experiment shows that the initial temperatures of Changzhi coal added with 30% Dawan coal could decrease 13.5 ℃,and mass loss rate of mixture coal was increased 4.05% than Dawan coal.FTIR data suggested that effect of additive has limited on content of CO in pyrolysis process.Release content of CO₂ has increased.Mix coal could promote hydrocarbons gas release and enhance proportion of volatile gas for combustion.