本研究主要目的在於研究循環式顆粒床過濾器之過濾效率、壓降及粉塵粒徑去除效率間之相互關係。依據冷模系統測試證明，循環式顆粒床過濾器可以以連續且循環之操作方式運作，我們可預估維持過濾器壓降穩定時之條件，並可使得過濾壓差洽維持某一定值，而除塵效率均可維持在99%以上，在去除粉塵粒徑效率方面約可達95%以上，實驗結果皆符合以經驗式所計算出來之去除效率範圍內。 另一方面，本研究將研究並試著瞭解氣體在流動式顆粒床過濾器中之流動路徑，並藉著改變阻礙物配置來增加其氣體路徑，以提升流動式顆粒床過濾器系統之過濾效率。實驗結果顯示，在倒V型校正單元配置中，有一配置位置可使上下氣流路徑趨於平衡。校正單元於過濾器內之上下移動的位置與設計型式，對氣體通過過濾器時之路徑將會有實質的影響。 The main objective of this research is to investigate the relations between the filter efficiency, the pressure drop, and the dust removing process in the granular moving bed filtration. According to our results with cold model filter, the moving granular bed can be operated continuously. The filtration efficiency can be maintained above 99% while the filter pressure drop is stable for the operation in a fixed-bed mode. The filtration efficiency is approximate 95% when filter bed is circulated. The experimental data of particle removing efficiency agree well with the empirical correlation formula by Tardos. We also investigated the flow path of gas in a fixed granular bed. Extending the path of gas in the filter bed with the internal elements could enhance the filtration efficiency in a granular bed filter. The effects of shape and position of the saddle-roof flow corrective elements in the granular bed on gas paths are investigates in this study. The results show that the inlet gas is divided into two approximately identical streams: The upper stream travels the granular bed above the flow corrective element and the lower stream flows under the element when the flow corrective element is at an optimal placement. The changes in positions and in design of the flow corrective elements affect the gas passage through the granular bed.
