双层桨自吸式反应器的气含率特性  

Characteristics of gas holdup in double-impeller self-inspirating reactor

作　　者：高勇 郝惠娣[2] 党睿 高平强 亢玉红 王战辉 Gao Yong;Hao Huidi;Dang Rui;Gao Pingqiang;Kang Yuhong;Wang Zhanhui(School of Chemistry and Chemical Engineering,Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization Yulin University,Yulin Shaanxi 719000,China;School of Chemical Engineering,Northwest University,Xi’an Shaanxi 710069,China)

机构地区：[1]榆林学院化学与化工学院陕西省低变质煤洁净利用重点实验室,陕西榆林719000 [2]西北大学化工学院,陕西西安710069

出　　处：《石油化工》2019年第5期496-500,共5页Petrochemical Technology

基　　金：国家自然科学基金资助项目(51762042);陕西省科技厅创新人才推进计划项目(2018KJXX-078);榆林市产学研合作项目(2016CXY-01)

摘　　要：考察了下层桨型式及结构尺寸对双层桨自吸式反应器内气含率(ε)的影响,为研究氧传质系数提供理论指导。实验结果表明,六直叶圆盘桨+六叶上斜叶桨组合在输入功率相同时,吸气速率较大,ε较高,可以促进气液传质。ε随下层桨安装高度(L_3)、下层桨桨叶角度(θ)、下层桨叶片长度(L/D)、下层桨叶片宽度(W/D)的增大而减小,即当L_3=0.05 m,θ=30°,L/D=0.125,W/D=0.2时,下层桨具有较高的泵送效率和气体分散能力,可以提高氧传质系数。ε的关联式为ε∝L_3^(-0.11)θ^(-0.56)(L/D)^(-0.62)(W/D)^(-0.26),对于预测氧传质系数的主要影响因素具有重要的参考作用。In order to provide theoretical guidance for the study of oxygen mass transfer coefficient in a double-impeller self-inspirating reactor,the effects of lower impeller type and structure dimension on gas holdup(ε) were investigated. The results showed that the impeller combination of six straight blades disc turbine(6SBDT)+six pitched blades upflow turbine(6PBUT) has higher rate of gas induction at the same input power,therefore,it has a higher ε and can promote the gas-liquid mass transfer. The ε decreases with increases of the installing height(L3),blades angle(θ),blades length(L/D) and blades width(W/D) of the lower impeller,that is,when L3=0.05 m,θ=30°,L/D=0.125,W/D=0.2, the lower impeller has higher pumping efficiency and gas dispersing ability,thus oxygen mass transfer coefficient can be promoted. The correlation of the ε is ε∝ L3^-0.11θ^-0.56(L/D)^-0.62(W/D)^-0.26,which is an important reference for predicting the main influencing factors of the oxygen transfer coefficient.

关 键 词：自吸式 反应器 气含率 氧传质系数 

分 类 号：TQ027[化学工程]