高炉上部炉型对炉料运动影响的数值模拟

Numerical simulation of influence of upper blast furnace profile on burden movement

高炉炉型对炉料在炉内运动规律有着决定性影响。以某企业高炉参数为原型,采用离散元方法对不同炉型条件下炉料运动进行了数值模拟,分析了炉料运动规律及其对矿焦比和孔隙率分布的影响。研究结果表明,在布料条件相同时,炉身角变小后,炉容扩大,炉料运动速度减缓;炉料下降过程中,矿石会向下降最快位置聚集,炉身角减小后,矿石边缘分布趋势更加明显;炉料下降过程中矿石与焦炭混合,孔隙率不断减小。炉身角减小后,炉料下降过程中孔隙率减小幅度变缓。

Blast furnace profile has a decisive influence on burden movement. Taking the blast furnace parameters of an enterprise as the prototype, numerical simulation on the burden movement under different furnace profiles was conducted using the discrete element method, and the burden movement law and its influence on the distribution of O/C ratio and porosity were analyzed. The result showed that when the distribution conditions were the same, after the furnace body angle became smaller, the furnace capacity expanded and the burden movement speed slowed down. During the process of burden descending, the ore would gather to the fastest descending position. After the furnace body angle decreased, the ore tended to be distributed at the edge of the blast furnace. During the process of burden reduction, ore and coke were mixed, and the porosity decreased continuously. After the furnace body angle decreased, the porosity decreased slowly during the process of burden reduction.