LIQUID FLUIDIZATION IN TAPERED VESSELS

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

TOKURO MIZUSHINA¹  TOSHIRO MARUYAMA¹  HIDEHIKO MAEDA¹ 

[1] Department of Chemical Engineering, Kyoto University

关键词: Chemical Reactor;    Fluid Mechanics;    Particle Size Classification;    Mixing;    Fluidized Bed;    Voidage Distribution;    Pressure Drop;    Minimum Fluidization Velocity;    Terminal Falling Velocity;    Fixed Bed;   

DOI  :  10.1252/jcej.17.132

来源: Maruzen Company Ltd

【 摘 要 】

References(8)Cited-By(10)The flow regimes of a tapered fluidized bed were represented on a diagram with two lines which show positions of the minimum fluidization velocity and the terminal falling velocity. The diagram was used to calculate the bed height and pressure drop by a proposed method. The results were compared with measurements for two-dimensional tapered fluidized beds. Some hydraulic characteristics were discussed on the basis of the measured voidage distributions. The results show that the proposed method predicts the bed height and pressure drop on the basis of the empirical voidage, which is expressed as a power function of the local superficial velocity. The calculation procedure is also applicable to multi-species particle systems with an assumption of complete segregation of the species. The voidage in a tapered fluidized bed of large apex angle is smaller and its dependence on velocity is less than that for a cylindrical fluidized bed. This suppresses bed expansion and promotes mixing between different solid species.

【 授权许可】

Unknown