摘要
应用电导探头测试技术,以直径5～6mm、颗粒密度2.6g/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2.82m/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.
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 εg was large in central area of TPFB,and it reduced near the side wall,with Ug increasing,εg increased,the radial distribution of εg became uneven.In the axial direction,the more upward,the greater εg became.With Ug increasing,εg increased,the radial distribution of εg became uneven.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第2期236-239,共4页
The Chinese Journal of Process Engineering
基金
国家高技术研究发展计划(863)基金资助项目(编号:2006AA06Z132)
教育部科学技术研究重点基金资助项目(编号:107124)
关键词
三相流化床
电导率仪
电导率
气含率
表观气速
轴径向分布
three-phase fluidized bed
conductivity meter
local gas holdup
superficial gas velocity
electrical conductivity
