陶瓷过滤器脉冲清灰过程的数值模拟

Numerical simulation of pulse cleaning performance of ceramic filter

采用雷诺应力模型和欧拉双流体模型,模拟多管陶瓷过滤器内脉冲反吹清除滤饼的三维非稳态气固两相流动,分析反吹过程中和反吹后过滤过程中滤管腔体内压力沿轴向的分布变化,考察参与反吹的滤管和不参与反吹的滤管外表面滤饼密度分布变化规律。结果表明:反吹前滤管中部滤饼密度最大,反吹后继续过滤,滤管开口端附近滤饼密度最大;与反吹滤管邻近的正常过滤的滤管受反吹过程的影响比较大,靠近反吹滤管一侧的滤饼密度增加得比其他位置快。

The 3D unsteady gas-solid two-phase flow of reverse jet pulse in ceramic filter vessel was simulated based on the Reynolds stress transport model and Eulerian two-fluid model. The variations of the pressure distribution along the axial direction in filter cavity during and .after the back pulse process were analyzed. The distributions of the filter cake density in axial direction along the under cleaning filter and normal filter were studied. The results show that the maximum value of filter cake density occurs in the central position of the filter, while the maximum intensity at the vicinity of the open end of filter after the pulse cleaning. The pulse cleaning process has relatively much impact on the normal filter adjacent to the under cleaning filter, so the cake density on the normal filter surface near the under cleaning filter increases quickly compared with other locations far from the under cleaning filter. The simulation results agree well with experimental data.