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,CO_2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.
The pyrolysis process of pulverized coal of Handan Steel was investigated by simultaneous thermogravime-try-fourier transform infrared (TG-FTIR). The results indicate that process of mass loss of Changzhi coal, Chang-zhi 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. Re-lease content of CO_2 has increased. Mix coal could promote hydrocarbons gas release and enhance proportion of vola-tile gas for combustion.
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