"こわれ"易い粒体の高濃度低速空気輸送

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From the aspect of factory hygiene and other reasons for sanitation, pneumatic conveying of granular solids has been increasing recently. Generally, this transportation method works efficiently in situations in which the velocity of the air and the concentration of solid materials in the duct is high. On the other hand, high velocity transportation causes the breakage of granules especially when the materials conveyed are brittle. Reasons for the breakage of granules are thought to be due to the collision between particles and the impaction of particles with the duct wall. As the results of the breakage, usually, size reduction of granules occurs, this means the products are of poor quality. In trying to solve these problems we made test equipment in which the granules are conveyed very slowly (average velocity; 1.54m/sec), slide together in the duct as clusters (a train of slugs). Using the above equipment we have observed the velccity of each slug, the quantity of the transported rate of the granules, and the flowing pattern of the slugs in the duct. For the evaluation of the extent of breakage of the particles, the size distribution of the particles before and after the experiments was compared. Some of the quantitative results are as follows; 1. In this series of experiments, pressure head of the fan was maintained at 585 mmAq and the flow rate of air was 1.3∿1.5 m^3/min. 2. The pressure drop across the slugs in the duct was 483 mmAq for Nylon chips and 563 mmAq in the case of M.S.G.. 3. After several conveyings, the extent of the shortening of M.S.G. was about 0.1mm in length (arithmetic mean diameter).
山口大学の論文

"こわれ"易い粒体の高濃度低速空気輸送

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