Effects of Different Size Distribution of Capturing Granules on Moving Bed Granular Filters

Moving bed filters are widely used in the field of high-temperature gas filtration. The property of the capturing particles is undoubtedly a crucial factor to determine the performance of the moving bed granular filters. A large cold-mode experiment was carried out in a moving bed granular filter with co-current flow (MBGF-CF). The characteristics of the pressure drop and the collection efficiency were investigated for two types of the capturing granules. The experimental results show that the filters express a similar filtration performance under the same operating conditions even if these two different capturing granules are used. A low superficial gas velocity or a low granule moving velocity results in a high filtration efficiency. In addition, the empirical relationship of the single-particle trapping mechanism for the dust to the total efficiency of the filter was proposed based on analyzing the particle size distribution, the particle shape, and the theoretical analysis of the void fraction construction.