ＣＦＭ層型固気接触装置内流動の基本特性に関する２次元コールドモデル実験

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  • Fundamental characteristics of gas-solid flow in a two-dimensional cold model of a CFM bed.
  • CFMソウガタ コキ セッショク ソウチナイ リュウドウ ノ キホン トクセイ

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A CFM bed which consists of the combination of a fast fluidized bed (or an entrained bed) with a moving bed is proposed for the development of a new type of gas-solid contactor.<BR>As the first step of R&D, the fundamental features of solid-particle flow such as particle holdup, particle velocity distributions and residence time of the particle were observed in a two-dimensional cold model by using glass beads as a typical fluidizing material under various solid/air ratios.<BR>As a result, it was observed that there exists a minimum fast fluidization velocity to form a stable fast fluidized bed in the inner pipe. Particle holdup in the inner pipe decreased with increasing gas velocity in the inner pipe. The velocity distribution of the solid particle in both the inner and the annular parts were found to agree relatively well with those obtained by a simple theoretical analysis based on single-particle behavior. The residence time of the particle was in proportion to the height of the inner pipe, and the scale-up effect was obtained within the experimental conditions employed.

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