The dust collection efficiency of annular, granular-bed filters is studied for high concentration dust removal in comparison with rectangular typed filter. The fly ash is removed under constant filtration rate using fixed and moving beds consisting of spherical solid. The overall collection efficiency drops as dust load increases, mainly due to re-entrainment of the capture dust by drag force of gas. A model proposed previously to describe the dust collection process taking the fluid drag acting on dust particle contacting with spherical medium into account, is applied to the annular filter. The distribution of local amount of deposited dust and overall collection efficiency are predicted. The model is effective to explain the decrease of collection efficiency and the increase of pressure loss with dust load increase in annular filter, too. It predicts that annular bed surpasses rectangular bed in filtration performance.
環状グラフィルタの微粒子捕集特性
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