| Fundamental studies on the hydrodynamics and mixing of gas and solid in a downer reactor |
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| 引用本文： | 汪展文,魏飞,金涌,俞芷青. Fundamental studies on the hydrodynamics and mixing of gas and solid in a downer reactor[J]. 中国化学工程学报, 1997, 5(3): 236-245 |
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| 作者姓名： | 汪展文 魏飞 金涌 俞芷青 |
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| 作者单位： | Department of Chemical Engineering，Tsinghua University，Department of Chemical Engineering，Tsinghua University，Department of Chemical Engineering，Tsinghua University，Department of Chemical Engineering，Tsinghua University，Beijing 100084，China，Beijing 100084，China，Beijing 100084，China，Beijing 100084，China |
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| 基金项目： | Supported by the National Natural Science Foundation of China and Tsinghua University Foundation. |
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| 摘 要： | The effect of flow direction on hydrodynamics and mixing in the upflow and downflowcirculating fluidized beds is discussed in details.Similar profiles of gas and solids velocities andsolids concentration are found in both risers and downers.When the flow is in the direction ofgravity(downer),the radial profiles of gas and particle velocity are more uniform than that inthe riser,the solids mixing is very small and the flow pattern approaches plug flow,while theflow is against gravity(riser),the solids backmixing significantly increase and the flow pattern isfar from plug flow.Among many of factors the flow direction has the largest influence onhydrodynamics and axial mixing of gas and solids.
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| 关 键 词： | circulating fluidized bed gas-solid mixing RTD |
| 收稿时间： | 1996-07-22 |
| 修稿时间： | |
Fundamental studies on the hydrodynamics and mixing of gas and solid in a downer reactor |
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| WANG Zhanwen,WEI Fei,JIN Yong,YU Zhiqing. Fundamental studies on the hydrodynamics and mixing of gas and solid in a downer reactor[J]. Chinese Journal of Chemical Engineering, 1997, 5(3): 236-245 |
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| Authors: | WANG Zhanwen WEI Fei JIN Yong YU Zhiqing |
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| Affiliation: | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The effect of flow direction on hydrodynamics and mixing in the upflow and downflow circulating fluidized beds is discussed in details. Similar profiles of gas and solids velocities and solids concentration are found in both risers and downers. When the flow is in the direction of gravity (downer), the radial profiles of gas and particle velocity are more uniform than that in the riser, the solids mixing is very small and the flow pattern approaches plug flow, while the flow is against gravity(riser), the solids backmixing significantly increase and the flow pattern is far from plug flow. Among many of factors the flow direction has the largest influence on hydrodynamics and axial mixing of gas and solids. |
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| Keywords: | circulating fluidized bed gas-solid mixing RTD |
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