COREX熔化气化炉风口回旋区的分形研究

Fractal analysis on raceway in COREX melter-gasifier

以COREX熔化气化炉物理模型为基础,对高速摄影仪记录的回旋区颗粒运动情况进行分析得到模型观察面上回旋区的颗粒速度场,运用分形方法对回旋区内不规则边界的表面积进行研究。结果表明:不同条件下,回旋区内表面边界的分维数变化不大;回旋区内表面积随着风量的增大而增大,当吹气量由106 m3/h变为122 m3/h时,回旋区表面积突增;回旋区内表面积随着床层高度的增大而减小,床层高度从200 mm变为250 mm,回旋区表面积变化较小,床层高度到达350 mm后,回旋区内表面积变化不大;回旋区内表面积随着排料速度的增加而增大。

The heat and mass transfer have influence on the combustion temperature and gas distribution.And the process of heat and mass transfer has close relation with the surface area of raceway.In this paper,the fractal theory,which is used to study boundary surface with extremely un-regular or fragment characteristics,is applied to study the surface area of raceway under different experimental conditions.The results show that the dimension of raceway boundary changes little;the surface area of raceway increases with the increase of blast volume and when the blast volume changes from 106 m3/h to 122 m3/h,the surface area of raceway increases suddenly;the surface area of raceway decreases with the increase of packing bed height and when the packing bed height changes from 200 mm to 250 mm,the surface area of raceway changes little;the surface area of raceway increases with the increase of discharging rate.