Abstract: In a laboratory-scale gas-lift loop reactor with annular bubbling, some hydrodynamic properties, such as gas hold-up in riser and liquid circulation were investigated. The drift flux model was used to study gas hold-up in riser. The relationship among εa, ug and u1 was established as follows: where um =ug +u1, Co = 1.58, vb = 30. 1cm/s. Based on the principle of minimum energy dissipation, the equation of liquid circulation was derived, that is, where K{= [2HgDe/(3λLe]0.5} is a structure parameter, which can be figured out by fitting the experimental data with the equation. According to this equation, the mechanism of circulation can be revealed. Furthermore, because of its general feature, the equation can be used for the description of liquid circulation in any gas-lift loop reactor.

摘要： 在筒体直径310mm、高2000mm的环隙气提式环流反应器实验装置中,对上流区的气含率、液相循环流动等流体力学特性作了研究.用漂流通量模型描述了上流区的气含率;通过对体系的能量耗散机理进行分析,基于体系总能耗最小的原理推导出液相循环流动方程,结果表明:用此方程能较好地模拟这种反应器内的液相循环状况.