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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。
The TG-FTIR combined technology was used to study the pyrolysis and weight loss process of coal injected from Handan Iron and Steel. The results show that the weight loss of Changzhi coal, Taiwan coal, 70% Changzhi coal and 30% Taiwan coal are roughly divided into three stages. At 450 ~ 800 ℃, the TG curve decreases sharply and the volatile matter largely escapes. DTA curve peaked at 590 ~ 700 ℃, pyrolysis of coal was violent. The analysis shows that the weight loss rate of Changzhi coal increases by 13.55 ℃ compared with that of raw coal after addition of 30% of Dawan coal, and the weight loss rate increases by 4.05% at 1000 ℃ compared with that of Changzhi coal, which shows that anthracite coal can increase pyrolysis process In the conversion of products, is conducive to improving the combustion of pulverized coal injection. The results of FTIR showed that the addition of 30% Taiwan coal had little effect on the formation of CO in the pyrolysis of coal and CO2 decreased. The release of methane gas is concentrated to a certain period of time to complete, and the release of an increase. In addition, coal blending also promotes the escape of other hydrocarbon gases and increases the proportion of volatile gas that participates in homogeneous combustion.