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1991 Fiscal Year Final Research Report Summary

Computational Simulation for Local Reactions in a Fluidized Bed Grid Zone

Research Project

Project/Area Number 02650699
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 化学工学
Research InstitutionDepartment of Industrial Chemistry, Seikei University

Principal Investigator

KOJIMA Toshinori  Seikei Univ., Dept. Ind. Chem., Associated Professor, 工学部, 助教授 (10150286)

Project Period (FY) 1990 – 1991
Keywordsfluidized bed / simulation / grid zone / modeling / cold model / chemical vapor deposition / polycrystalline silicon / coal gasification
Research Abstract

A cold model experiment and development of a fluidized bed grid zone model
Local behavior of gas and sohds in a grid zone was investigated by using a fluidized bed cold model. A couple of optical fiber sensors were used to measure a local particle velocity, its concentration, jet diameter and jet height. Local tracer gas concentration was measured by using a gas sampling prove and a gas chromatograph. Circulation of sohds and gas was found to be better when a cone-shaped distributor was employed than that when a flat distributor was used. A numerical model of a fluidized bed grid zone was developed for the description of the cold model data. The numerical results on concentration profiles of gas in the grid zone and particle velocity in jet well coincided with the experimental cold model data when flat distributor was employed. However, when a cone-shaped gas injecter was employed, the numerical results showed lower extent of mixing of gas and solids then those observed experimentally. It was suggest that more complex mixing of gas and solids was occurred in the later case.
Applications of the grid zone model
The grid zone model was applied to chemical vapor deposition of polycrystaflffie silicon by monosilane pyrolysis. The numerical results suggested that the fines mainly tonned in bubbles. The numerical model well expected the experimentally observed effects of gas velocity, bed temperature, silane concentration and grid structure on the likelihood of clogging. A model combining a fluidized bed grid zone model and Kunii-Levenspiel bubbling bed model was proposed and was applied to the analysis of the local progress of coal gasification. From the comparison of the numerical and experimental results, the contribution of the reaction in the grid zone was found to be significant to the overail reactions. Further study on the steam and CO_2 gasification kinetics was found to be necessary.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Kojima T.,Kimura T.,Matsukata M.: "Development of Numerical Model for Reactions in Fuluidized Bed Grid Zone-Application to Chemical Vapor Deposition of Polycrystalline Silicon by Monosilane Pyrolisis-" Chemical Engineering Science. 45. 2527-2534 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 木村 匡,小島 紀徳: "流動層CVDによる多結晶シリコン製造におけるグリッドゾ-ンの寄与の推算" 化学工学論文集. 17. 81-87 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kimura T.,Kojima T.: "Numerical Model of a Fluidized Bed Reactor for Polycrystalline Silicon Production of CVD and Fines Formation" Journal de Physique. 1. C2-103-110 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kimura T.,Kojima T.: "Numerical Model for Reactions in a Jetting Fluidized Bed Coal Gasifier" Chemical Engineering Science.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima T., Kimura T., Matsukata, M.: "Development of Numerical Model for Reactions in Fluidized Bed Grid Zone-Application to Chemical Vapor Deposition of Polycrystalline Silicon by Monosilane Pyrolisis-" Chem. Eng. Sci.45. 2527-2534 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimura T., Kojima T.: "Evaluation of Contribution of Grid Zone is Silicon Production via Fluidized Bed CVD-Monosilane argon system-" J. Chem. Eng. Jpn.17. 81-87 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimura T., Kojima T.: "Numerical Modsl of a Fluidized Bed Reactor for Polycrystalline Silicon Production of CVD and Fines Formation" J. de Physique. 1. C2-103-110 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimura T., Kojima T.: "Numerical Model for Reactions in a Jetting Fluidized Bed Coal Gasifier" Chem. Eng. Sci.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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