| A Sedimentation-Dispersion Model for both Non-attached and Attached Particles in Three-Phase Batchwise Fluidized Beds |
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| 作者姓名： | 张济宇 林诚 林春深 |
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| 作者单位： | ZHANG Jiyu LIN Cheng LIN ChunshenInstitute of Chemical Engineering and Technology，Fuzhou University，Fujian 350002，China |
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| 基金项目： | Supported by the Fujian Provincial Education Council (No. JB9940). |
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| 摘 要： | The axial concentration distribution of both particles with better wetting (forming non-attached system) and poorer wetting (forming attached system) was investigated in a vertical gas-liquid-solid fluidized bed of 4.2 cm in diameter and 130 cm in height with the solids holdup less than 0.05. The one-dimensional sedimentation-dispersion model could be used satisfactorily to describe the axial distribution of solids holdup by modifying only a model parameter, i.e. by means of the terminal settling velocity minus a certain value, which is a function of gas velocity and considers the effect of an additional drag force resulted from attached rising bubbles. The axial profiles of solid concentration predicted are in good agreement with experimental results. This model also explains reasonably the different axial distributions of solid concentration, i.e. the solids holdup decreases as the axial height increases in non-attached system, but increases with the axial height in attached system at a given gas veloc
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A Sedimentation-Dispersion Model for both Non-attached and Attached Particles in Three-Phase Batchwise Fluidized Beds |
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| ZHANG Jiyu LIN Cheng LIN ChunshenInstitute of Chemical Engineering and Technology,Fuzhou University,Fujian ,China.A Sedimentation-Dispersion Model for both Non-attached and Attached Particles in Three-Phase Batchwise Fluidized Beds[J].Chinese Journal of Chemical Engineering,2002,10(2). |
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| Authors: | ZHANG Jiyu LIN Cheng LIN ChunshenInstitute of Chemical Engineering and Technology Fuzhou University Fujian China |
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| Affiliation: | ZHANG Jiyu LIN Cheng LIN ChunshenInstitute of Chemical Engineering and Technology,Fuzhou University,Fujian 350002,China |
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| Abstract: | The axial concentration distribution of both particles with better wetting (forming non-attached system) and poorer wetting (forming attached system) was investigated in a vertical gas-liquid-solid fluidized bed of 4.2 cm in diameter and 130 cm in height with the solids holdup less than 0.05. The one-dimensional sedimentation-dispersion model could be used satisfactorily to describe the axial distribution of solids holdup by modifying only a model parameter, i.e. by means of the terminal settling velocity minus a certain value, which is a function of gas velocity and considers the effect of an additional drag force resulted from attached rising bubbles. The axial profiles of solid concentration predicted are in good agreement with experimental results. This model also explains reasonably the different axial distributions of solid concentration, i.e. the solids holdup decreases as the axial height increases in non-attached system, but increases with the axial height in attached system at a given gas velocity. |
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| Keywords: | three-phase fluidized bed terminal settling velocity sedimentation-dispersion model axial distribution of solids holdup |
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