| A Revised CFB Wall-to-suspension Heat Transfer Model |
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| 作者姓名： | 苏亚欣 |
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| 作者单位： | CollegeofEnvironmentalScienceandEngineering,DonghuaUniversity,Shanghai200051 |
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| 基金项目： | the Project of Outstanding Young University Teachers of Shanghai,No.03YQHB076. and R & D Fund of DonghuaUniversity |
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| 摘 要： | Based on the Cluster Renewal Model of the particle motion in a CFB riser, a revised heat transfer model is developed, which introduces the latest research results of the hydrodynamics of the suspension flow in CFB. This model divides the heat transfer into two parts, which are due to the transient heat conduction by the covered clusters and the convection between the uncovered wall and the dispersed phase. Radiation at high temperature is regarded as being additive. The fraction of the covered wall by clusters is revised by a new formula, which is a function of the operating condition and the particle properties. The radiation between the dispersed phase and the uncovered wall includes not only the direct radiation to the uncovered wall, but also the radiation to the clusters and then reflected to the uncovered wall. Calculation was carried out for the CFB heat transfer model. The results were compared with the published typical experimental data of other researchers and showed a good agreement between them.
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| 关 键 词： | 热传输模式 水动力学 CFB 循环流化床 煤燃烧技术 |
A Revised CFB Wall-to-suspension Heat Transfer Model |
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| SU Ya-xin.A Revised CFB Wall-to-suspension Heat Transfer Model[J].Journal of Donghua University,2005,22(1):97-101. |
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| Authors: | SU Ya-xin |
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| Abstract: | Based on the Cluster Renewal Model of the particle motion in a CFB riser, a revised heat transfer model is developed, which introduces the latest research results of the hydrodynamics of the suspension flow in CFB. This model divides the heat transfer into two parts, which are due to the transient heat conduction by the covered clusters and the convection between the uncovered wall and the dispersed phase. Radiation at high temperature is regarded as being additive. The fraction of the covered wall by clusters is revised by a new formula, which is a function of the operating condition and the particle properties. The radiation between the dispersed phase and the uncovered wall includes not only the direct radiation to the uncovered wall, but also the radiation to the clusters and then reflected to the uncovered wall. Calculation was carried out for the CFB heat transfer model. The results were compared with the published typical experimental data of other researchers and showed a good agreement between them. |
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| Keywords: | circulating fluidized bed heat transfer model cluster renewal model modification |
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