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›› 2010, Vol. 10 ›› Issue (2): 236-239.

• 流动与传递 • 上一篇    下一篇

三相流化床中表观气速对电导率及相含率的影响

李鸿莉 李登新 段广杰 刘广涛   

  1. 东华大学环境科学与工程学院 东华大学环境科学与工程学院 东华大学环境科学与工程学院 东华大学环境科学与工程学院
  • 收稿日期:2009-11-27 修回日期:2010-03-19 出版日期:2010-04-20 发布日期:2010-04-20
  • 通讯作者: 李鸿莉

Effects of Superficial Gas Velocity on Electrical Conductivity and Phase Holdup in Three-phase Fluidized Bed

LI Hong-li LI Deng-xin LIU Guang-tao, DUAN Guang-jie   

  1. College of Environmental Science and Engineering, Donghua University College of Environmental Science and Engineering, Donghua University College of Environmental Science and Engineering, Donghua University College of Environmental Science and Engineering, Donghua University
  • Received:2009-11-27 Revised:2010-03-19 Online:2010-04-20 Published:2010-04-20
  • Contact: LI Hong-li

摘要: 应用电导探头测试技术,以直径5~6 mm、颗粒密度2.6 g/cm3的玻璃珠为固相,空气为气相,自来水为液相,对三相流化床中不同部位的电导率进行测定,研究了表观气速对电导率、气含率的影响. 结果表明,径向上(除测孔1外)越靠近流化床中心部位电导率越低,轴向上与气体分布板距离越远电导率越低. 在表观气速分别为0.81和2.82 m/s时,流化床中心区域气含率较大,靠近边壁区域气含率减小(除测孔1外),随表观气速增加,气含率增加,气含率径向分布均匀性变差,轴向越向上气含率越大(除测孔1外),气含率轴向分布均匀性变差.

关键词: 三相流化床, 电导率仪, 气含率, 表观气速, 电导率

Abstract: The effects of superficial gas velocity on electrical conductivity and local gas holdup in three-phase fluidized bed (TPFB) were examined in a 90 mm diameter column by the conductivity probe method. The experiments were carried out with glass beads in the diameter of 5~6 mm, and density of 2.6 g/cm3 as solid phase, and water and air as the liquid and gas phases respectively. Experimental results show that except test hole 1, in the radial direction, the more close the distance to the center of TPFB, the lower the electrical conductivity; in the axial direction, the greater the distance from the gas distributor, the lower electrical conductivity and the more uniform distribution of electrical conductivity. When Ug was 0.81 and 2.82 m/s respectively, gas hold-up eg was large in central area of TPFB, and it reduced near the side wall, with Ug increasing, eg increased, the radial distribution of eg became uneven. In the axial direction, the more upward, the greater eg became. With Ug increasing, eg increased, the radial distribution of eg became uneven.

Key words: three-phase fluidized bed, conductivity meter, local gas holdup, superficial gas velocity, electrical conductivity

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