熱噴流乾燥機における乾燥タンクの粒子排出特性

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  • 林 直人
    東京大学大学院　工学系研究科　地球システム工学専攻
  • 島田 荘平
    東京大学大学院　新領域創成科学研究科　環境学専攻

書誌事項

タイトル別名
  • Discharging Characteristics of Particles from the Drying Tank in a Thermal Jet Dryer
  • ネツ フンリュウ カンソウキ ニ オケル カンソウ タンク ノ リュウシ ハイシュツ トクセイ

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説明

Authors are developing a thermal jet dryer for the purpose of weight and volume reduction and recycling of sludge dehydrated cake. In order to investigate the discharging characteristics of particles from the drying tank, which is disc type and set vertically, experiments using a cold model equipment with airflow at ambient temperature and calculations using a CFD software FLUENT were carried out. The following results were obtained. (1) Velocity and its tangential component of airflow in the tank are almost the same, so they could be measured by a one dimension anemometer. It suggests that the Rankine eddy is generated in the tank. (2) By calculations using FLUENT, tangential velocity and direction profile of airflow in the tank were almost corresponding to experimental ones. (3) After feeding particles in the tank, velocity of airflow has decreased. Therefore, particles could not circulate along the inner wall and took off from it. This phenomenon contributed to the discharge of particles from the tank, and it was shown by FLUENT using two-way coupling calculation for gas-solid multiphase flow. (4) Experimental and calculated average residence time of particles in the tank were in the order of hundreds seconds. They corresponded with each other when the horizontal velocity ratio of particles-wall collisions was between 0.8 and 0.9.

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  • 資源と素材

    資源と素材 120 (3), 164-170, 2004

    一般社団法人 資源・素材学会

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