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通过采用热重及反应物岩相观察,研究不同煤种在不同配比下混煤残碳与CO2反应行为,由热重曲线可知:2种煤混合时,在900～1 100℃,混煤实际与加权失重率相差不大,甚至实际失重率小于加权失重率;在1 100～1 200℃,混煤的实际失重率大于加权失重率,最大时相差10%。3种煤混合时,煤粉的实际失重率既与温度也与挥发分有关。得出结论:在1 100～1 200℃时,高炉喷吹混煤反应性更强,焦炭的保护作用更为突出,高炉内煤粉利用率更高。从煤粉碳素熔损反应后形态来看,高煤质煤粉残碳先于低煤质煤粉残碳反应完全。煤粉的挥发分含量不同时,其反应形态也不同:低挥发分的混煤中,烟煤的内孔反应和气泡产生不剧烈;而在高挥发分的混煤中,烟煤残碳反应现象较为剧烈。
Through the thermogravimetric analysis and the observation of facies of reactant, the reaction behavior of residual carbon and CO2 in different types of coal under different proportions was studied. The thermogravimetric analysis shows that when two kinds of coal are mixed, The actual weight loss rate is not much different from the weighted weight loss rate, and even the actual weight loss rate is less than the weighted weight loss rate. At 1 100-1 200 ℃, the actual weight loss rate of the mixed coal is greater than the weighted weight loss rate and the difference is 10% at the maximum. When three kinds of coal are mixed, the actual weight loss rate of the pulverized coal is related to the temperature and the volatile matter. The conclusion is that when the temperature is between 1 100 and 1 200 ℃, the reactivity of blast furnace pulverized mixed coal is stronger, the protective effect of coke is more prominent, and the pulverized coal utilization rate in the blast furnace is higher. From the morphology of coal carbon loss after melting reaction, the high coal quality coal residue carbon before the low-quality coal residue carbon reaction completely. When the volatile content of pulverized coal is different, the reaction morphology is also different: in the low-volatile mixed coal, the internal pore reaction and bubble generation of bituminous coal are not severe; while in high-volatile mixed coal, the reaction phenomenon of residual coal in bituminous coal is relatively severe.