摘要
在内径0．3rn，高6．6m的加压气液鼓泡塔反应器中，采用电阻层析成像技术（ERT）研究了空气．水体系中气泡群平均上升速度、局部气含率及其径向分布。在表观气速0．119～0．312m·s^（-1），压力0．5～2．0MPa，考察了表观气速、压力对气泡群上升速度、局部气含率及其径向分布的影响。实验结果表明，鼓泡塔中局部气含率随着表观气速与压力的增大而增大，其径向分布呈现出中心高边壁低的分布特征，但整个截面的分布并非严格对称，在r／R=0～0.3，气含率变化较小，且极大值出现在该范围内；气泡群的局部上升速度随着表观气速的增大而增大，但是随着压力的增大而减小。
Mean bubble swarm rising velocity and radial variation of gas holdup were investigated by using electrical resistance tomography （ERT） in a bubble column reactor with 0.3 m diameter and 6.6 m height under elevated pressures. In all the experiments, air was used as the gas phase and tap water as liquid phase where the gas velocity was varied from 0.119 to 0.312 m.s-1 and the system pressures was varied from 0.5 to 2.0 MPa. The effects of operation conditions on the radial distribution of gas holdup and bubble swarm rising velocity were discussed. The results show that the gas holdup increases constantly with the increase of the superficial gas velocity and pressures, and there is a maximum holdup in the range of r/R=0.4）.3, at the same time, the radial distribution of gas holdup is flatter in this region. However, as the gas holdup, the bubble swarm rising velocity increases constantly with the increase of the superficial gas velocity, but decreases with the increase of pressures.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2013年第3期372-379,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金资助项目(20776018)
北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD20130325)
关键词
加压气液鼓泡塔
局部气含率
气泡群上升速度
电阻层析成像技术
pressurized bubble column reactor
local gas holdup
bubble swarm rising velocity
electrical resistance tomography.
