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采用压差法和双电导探针法考察了筛板结构对φ300mm多级鼓泡塔中筛板下侧气垫层高度和筛板上下两处局部气含率的影响.结果表明,气垫层高度随表观气速ug增加而增加,随开孔率降低而增加,当ug从0.04m/s增加到0.24m/s时,气垫层高度从0.01m增加到0.06m.而局部气含率的径向分布与普通鼓泡塔相似,都随ug增加而增加,随径向位置r/R增加而减小;筛板的引入使局部气含率在轴向方向发生较大变化,ug=0.027m/s时,筛板上下两侧的局部气含率均在0.05左右,但ug增加到0.11m/s时,下侧气含率则普遍增加到0.3～0.35,而上侧则在0.25～0.3之间,下侧普遍比上侧气含率高.
The effects of frit structure on the height of air cushion under the sieve plate and the local gas holdup at the upper and lower sides of sieve plate in φ300mm multi-stage bubbling tower were investigated by differential pressure method and double conductance probe method.The results showed that the height of air cushion layer When the ug increases from 0.04m / s to 0.24m / s, the height of the cushion increases from 0.01m to 0.06m while the apparent gas velocity increases with the increase of ug, Similar to the general bubbling tower, both increase with increasing ug and decrease with increasing r / R in radial direction. The introduction of frit changes the local gas holdup greatly in the axial direction, ug = 0.027m / s, the partial gas holdups on the upper and lower sides of the frit are all around 0.05, but when the ug increases to 0.11 m / s, the gas holdup on the lower side generally increases to 0.3 ~ 0.35 and the upper side is 0.25 ~ 0.3 Between the lower side of the gas holdup than the upper rate is generally high.