SEBS高黏度溶液气液鼓泡塔的流体力学研究

针对SBS加氢反应器开发与设计，以SEBS-1650己烷溶液为液相，采用差压法和床层塌落法研究了气液鼓泡塔中高黏度溶液的流体力学行为，考察了黏度对低表面张力溶液的气含率、大小气泡气含率、大小气泡上升速度和比表面积等因素的影响。结果表明，随黏度增加，大气泡增多，气含率明显降低，塔内流型处于湍流区；由床层塌落曲线确定鼓泡塔内存在三种类型的气泡：大气泡、小气泡及细小气泡，随黏度增加，小气泡与细小气泡逐渐减少；黏度对大小气泡的上升速度略有影响，比表面积随黏度增加而明显降低。根据实验结果给出了大小气泡气含率与平均气含率的计算公式。

Hydrodynamic study on a gas-liquid bubble column with high viscosity SEBS solution

For development and design of SBS hydrogenation reactor, the hydrodynamic behavior of high viscosity solution in gas?liquid bubble column using SEBS-1650 hexane solution as liquid phase was studied by differential pressure method and gas disengagement method. The effects of viscosity on gas holdup of solution with low surface tension, gas holdup of large and small bubbles, rise velocity of large and small bubbles and specific surface area were investigated. With the increase of viscosity, gas holdup decreased significantly, and flow pattern directly transited turbulent regime. From the curve of gas disengagement method, three types of bubbles were identified in bubble column: large bubbles, small bubbles and fine small bubbles. The gas holdup of small bubbles and fine small bubbles gradually decreased with the increase of viscosity. Viscosity has a slight influence on the rise velocity of large and small bubbles, and the specific surface area decreased significantly with the increase of viscosity. Based on the experimental results, the formulas for calculating gas holdup of large and small bubbles and average gas holdup were listed. These results provided some necessary and reliable basic data for designing and developing a SBS hydrogenation reactor.