近年來先進國家為了能源短缺問題，積極發展可以增加能源使用效率之高溫過濾流動式顆粒床過濾器。近年來為了可以增加顆粒床過濾器的多功能過濾用途，進而有兩階段流動式顆粒床過濾器的想法，但因在過濾器置入兩種不同粒徑的耐高溫、耐酸鹼和不易破碎等性質的濾材，並且也可以置入可以吸附酸性氣體或著可以吸附二氧化碳的顆粒濾材，達到未來的兩階段顆粒床過濾器也可以有碳捕獲、脫酸和攔截微小顆粒體等多功能過濾功能。依照先前的單一種粒徑濾材的床體配置一定會相當不同，進而須先了解雙濾材、單一濾材和粉塵、雙濾材和粉塵在不同重量混合比例其流動性質，包含壁面摩擦角、內部摩擦角、流動函數和流動因子等流動性質，進而作為兩階段流動式顆粒床過濾器床體設置參數依據，以避免濾材流動靜止區的形成，造成系統堵塞之問題，甚至影響其過濾效率。 Silica sands are prospective granular filter media in two-stage granular moving bed filters (GMBF) for hot gas cleanup technology. Two filter media, usually coarse sands and fine sands are used in two-stage GMBFs in order to increase their filter efficiency. GMBF developers fear that fine filter media can bring together flowability problems in granular moving bed. Wall friction and internal friction of GFM affects flow patterns and stagnant zones in moving bed of granular filter considerably. Measurements of kinematic wall friction angles of different mixtures of fine sand, coarse sands and fly ash are presented in this thesis. Uncorroded carbon steel, polydur lining, stainless steel and glass specimens are chosen as wall materials for designing referral. A brief description of the test equipment used to measure wall friction together with a method of evaluation of kinematic angle of wall friction is discussed. Measurements of internal friction and flow function of coarse sand and fine sand for designing referral.
