循环浆态床气液传质系数的研究  

Research on Gas-Liquid Mass Transfer Coefficient in Circulating Slurry Reactor

作　　者：李建辉[1] 曾清华[1] 苏宜丰[1] 姚丹龙[1] 王亦飞[1] 于遵宏[1] 

机构地区：[1]华东理工大学洁净煤技术研究所,上海200237

出　　处：《化学反应工程与工艺》2007年第5期450-455,共6页Chemical Reaction Engineering and Technology

摘　　要：以空气-水-玻璃微珠和空气-石蜡油-玻璃微珠两种三相系统为研究对象,在常温常压下分别考察了液体介质的粘度等物性因素,表观气速、固含率、液体循环量等操作因素,气体分布器、分隔板等结构因素对循环浆态床反应器气液传质特性的影响。实验结果表明,气液传质系数随表观气速的增加而增加,随液体粘度和固含率的增大而减小,当表观气速和固含率增加到一定程度后,传质系数趋于稳定;低气速下,玻璃烧结板的传质效果较好,而较高气速时,多孔板和新型锐孔分布器的传质效果较好;分隔板能显著增大气液传质系数。对多孔板分布器实验数据进行了拟合,得出气液传质系数的经验关联式,关联式计算值与实验结果吻合良好。The gas-liquid mass transfer characteristics in the air-water-glass beads and air-paraffin oil-glass beads were studied in a circulating slurry reactor. At room temperature and atmospheric pressure, the effects of liquid physical properties （viscosity）, the operational factors （the superficial gas velocity and solid holdup and liquid circulating） and the structure factors （gas distributor and separator inserter ） on the mass transfer coefficient were investigated in detail. The results showed that the gas-liquid mass transfer coefficient increased with the increase of superficial gas velocity, but decreased with the increase of liquid viscosity and solid holdup. When the superficial gas velocity and solid holdup reached certain value, the gas-liquid mass transfer coefficient would keep steady. At low superficial gas velocity, the mass transfer efficiency by using sintered plate as gas distributors was better, but at high superficial gas velocity, porous and radiant orifice perform better. Separated inserter could increase the mass transfer coefficient evidently. An empirical correlation of the mass transfer coefficient with the above factors was proposed by porous gas distributor and the values predicted by the correlation equation were in good agreement with the experimental data.

关 键 词：循环浆态床 传质系数 气体分布器 

分 类 号：TQ021.4[化学工程] TQ051.1