提高预热煤粉燃烧率的机制

 以邯郸钢铁公司2种高炉喷吹用煤粉作为原料，用马弗炉进行预热，测定不同温度预热后的失重率和燃烧率，并采用扫描电镜（SEM）观察预热后煤粉表面结构的变化。试验结果表明，烟煤150℃预热时的失重率为512%，且随着预热温度升高，煤粉的失重率增加，预热温度300℃时失重率可达到17.24%。无烟煤预热后失重率变化不大，预热温度为300℃时失重率仅为5.66%。预热后煤粉燃烧率明显升高。300℃预热条件下的烟煤燃烧率为89.74%，相对于原煤提高了15.67%，无烟煤燃烧率为85.19%，相对于原煤提高了24.80%。预热后煤粉表面结构发生了明显变化，层状和孔隙结构增加，从而提高了煤粉的燃烧率，为提高预热煤粉的燃烧率提供了理论基础。

Combustion Rate of Pulverized Coal Through Preheating Pulverized Coal

Two kinds of pulverized coal injected from Handan steel was preheated with muffle furnace. Their weight loss rate and combustion rate was measured at different preheating temperature, and the surface structure of pulverized coal was observed by scanning electron microscopy (SEM). Experimental results show that weight loss rate of bituminous coal preheated 150℃ is 5.12%, with increase in preheated temperature, weight loss rate of pulverized coal is increasing. Bituminous coal weight loss rate is 17.24% under preheating 300℃. Preheated anthracite coal weight loss rate changes little; anthracite coal only reaches 5.66% at 300℃. After preheating the pulverized coal combustion rate obviously improves, bitumite coal combustion rate can reach 89.74%, improved 15.67% than bituminous row coal, anthracite coal combustion rate is 85.19%, improved 24.80% than anthracite row coal. After preheating, the pulverized coal surface structure has obviously changing, layered and pore structure is increased, which can improve the combustion rate of pulverized coal and provide theoretical basis for improving combustion rate by preheating pulverized coal.