高炉喷吹煤粉的粉体流动性与煤质相关性

Correlation between the powder flow ability and coal quality of pulverized coal for a blast furnace

利用Carr粉体流动指数法评价高炉喷吹煤粉的流动特性及喷流特性,研究了煤岩显微组分、变质程度等煤质特性对高炉喷吹煤粉流动性的影响.研究发现,流动特性与喷流特性几乎呈负相关.煤变质程度对煤粉流动特性及喷流特性都有显著影响.变质程度低的烟煤,流动特性差,喷流特性好;变质程度高的无烟煤,流动特性好,喷流特性差.镜质组体积分数为60%～70%时,流动特性指数较差;体积分数在83%～95%,由于影响因素较多,流动特性与镜质组没有相关性.丝质组与喷流特性正相关,与流动特性负相关.矿物质与煤粉流动性无相关性.

Carr＇s flowability index was used to evaluate the flow ability and the jet flow characteristic of pulverized coal for a blast furnace.The effects of coal characteristics including maceral and coal rank on the flow ability during pulverized coal injection in a blast furnace were investigated.The results show that the correlation between the flow ability and the jet flow characteristic is almost negative.Coal rank has remarkable effect on the flow ability and the jet flow characteristic.Bituminous coal with a low metamorphic grade has a poor flow ability and an excellent jet flow characteristic,but anthracite coal with a high metamorphic grade has an excellent flow ability and a poor jet flow characteristic.When the volume fraction of vitrinite is between 60% and 70%,the flowability index is poor.There is no correlation between the flow ability and vitrinite when the volume fraction of vitrinite is between 83% and 90% because of too many influencing factors.Inertinite shows a positive correlation with the jet flow but a negative correlation with the flow ability.It is not correlative between mineral and the flow ability.