邯钢高炉喷吹煤粉的快速热解机制

为了提高邯钢高炉喷吹煤比,模拟煤粉在高炉内的热解。以邯钢喷吹用长治煤(以下简称CL)和大湾煤(以下简称DW)为原料,采用等离子体进行快速热解,计算反应后煤粉的分解率,利用气相色谱仪对气体产物进行分析以及用扫描电镜(SEM)观察反应产物的形貌特征。试验结果表明,CL和DW的分解率分别为43.10%和52.04%,气相产物主要为CO、H2、CH4、C2H2及少量C2H4等气体,热解产物的粒径减小,形貌发生明显变化。在CL煤的基础上配加不同比例的DW后,煤粉颗粒出现了孔状结构,因此可以提高炉内风口回旋区固定碳颗粒的燃烧率,为提高煤粉燃烧率提供理论依据。

Flash Pyrolysis of Pulverized Injection Coal at Hansteel

Aimed at increasing pulverized coal injection at Handan Steel,the pyrolysis of coal in raceway was simulated.The coal of CL and DW were selected and the decomposition rate was calculated by plasma pyrolysis.Gas products were analyzed by gas chromatography and morphology of residues were observed by scanning electron microscopy(SEM).The results show that CL and DW decomposition rate is 43.10% and 52.04% respectively and gas products of coal after plasma pyrolysis,which are different from general pyrolysis,consist of CO,H2,CH4,C2H2 and small content of C2H4,etc.Pyrolysis product has changed evidently,particle size become smaller.The vesicular structure occurs in coal grains when DW is added in the sample,which makes the specific surface area of coal grain increase.The solid carbon combustion ratio in tuyeres can be enhanced,which will provide the theoretical basis for pulverized coal combustion rate.