COREX竖炉围管堵塞位置及其演变过程的物理模拟

建立COREX竖炉三维半周物理模型,模拟竖炉围管粉尘初始堵塞位置及其演变过程,考察鼓风量、排料速度、非工况排料等操作条件对围管粉尘堵塞的影响.模拟结果显示,COREX竖炉围管初始堵塞位置为AGD架梁圆管前方的8#~12#导气槽区域.当导气槽前端填充床内形成粉尘沉积区后,若沉积区向上发展速度大于其随物料向下运动速度,粉尘沉积区向围管方向发展,并逐步堵塞围管导气槽,进而在围管内形成粉尘堆积区.该堆积区在围管内继续发展,使得其堆脚向围管远端运动,从而逐步将远端导气槽堵塞.此外,模拟发现随着排料速度加快及鼓风量增加,围管内不易发生粉尘堵塞.当炉内非工况条件发生时,粉尘堆积的动态平衡被打破,易造成围管内粉尘的堆积堵塞.

Physical simulation of the position and evolution process of dust accumulation in the bustle pipe of a COREX shaft furnace

A 3D semi-cylindrical physical model of COREX shaft furnace was established, and the initial position and evolution process of dust accumulation in the bustle pipe of a shaft furnace were investigated through this model. The effects of discharging rate, gas flow rate, and non-normal operation condition on dust accumulation in the bustle pipe were also studied. The results show that the initial position of dust accumulation in the bustle pipe is in the 8#-12# slot region, located before the supporting tube of AGD beam. The dust blockage is first formed in the packed bed near the slot and then blocks the slot and grows into the bustle pipe if the growth velocity of the blockage region is greater than the descending velocity. Finally, dust accumulation can be observed in the bustle pipe. The dust accumulation is still growing in the bustle pipe, and the edge of the dust pile could develop to the far side; thus, the other slots would be gradually clogged by dust. Moreover, the results confirm that with increased discharge and gas flow rates, dust accumulation in the bustle pipe is greatly hindered. In contrast, under non-normal operation conditions, the dynamic balance of dust blockage is broken, and dust accumulation in bustle pipe is easily formed.