搅拌槽内不同桨型组合的气-液分散特性  

Gas-liquid dispersion in a stirred tank with diferent impeller combinations

作　　者：龙建刚[1] 包雨云[1] 高正明[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2005年第5期1-5,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：教育部优秀青年教师资助计划项目(2002350)

摘　　要：在直径为0.476 m的椭圆底搅拌槽内,分别研究径向流桨(八弯叶涡轮CDT-8)组合、轴流式搅拌桨(四叶宽叶翼形WH桨)组合及混合流型组合桨(径向流的六叶半椭圆管盘式涡轮HEDT与三窄叶翼形桨CBY)的通气功率及气含率,并得到了相应的通气功率和气含率的经验关联式。结果表明:HEDT底桨配合CBY轴流桨的混合流组合桨的RPD值下降最少,轴向流组合次之,而径向流组合桨RPD下降最多;在相同的通气搅拌功率下,在低通气量时,轴向流组合桨的气含率最高,在较高的通气流量时,混合流及径向流组合桨的气含率相当,均高于轴向流组合桨。文中的研究结果可为工业多层桨气-液搅拌槽/反应器的优化设计提供参考。Power demand and gas holdup were studied in a stirred tank of 0. 476 m diameter with different impeller combinations. Three types of impeller combination named radial flow impeller combinations consisting multiple curved disk turbines （CDT）, axial flow impeller combinations consisting multiple 4-wide-blade hydrofoil impellers （WH） and mixed flow impeller combinations consisting half elliptical disk turbine （HEDT） and 3- narrow-blade hydrofoil impellers （CBY）, were used in the experiments. The gassed power demand and the gas holdup correlations for different impeller combinations were obtained by regressing the experimental data. The results show that the mixed flow impeller combinations have the highest relative power demand （RPD） and the next is the axial flow impeller combinations. Under the same gassed power input, when the gas flow rate is lower, the gas holdup of the axial flow impeller combinations is the highest and when it is higher the gas holdup of the mixed flow impeller combinations is similar to that of the radial flow impeller combinations, and both are significantly that of the axial flow impeller combinations. The results are of importance to the design of the industrial multi-impeller gas-liquid stirred tank/reactors.

关 键 词：通气功率 气含率 多层桨 气-液搅拌槽 

分 类 号：TQ027.32[化学工程]