同心管侧向对流式气液混合器设计与实验

Design and experimental study on lateral convection gas-liquid mixer with concentric tube

气液混合器是保障室内用空气、水成功模拟气、油生产过程中流型的关键设备。本文理论分析了空气与水的混合,对比研究了常用的三类混合器的结构和混合方式,基于井筒油气两相流实验教学装置的特点,运用三维绘图软件UG NX,设计了一种多孔喷管和四通在同一中轴线的同心管侧向对流式混合器,利用求取气泡最大比表面积的方法,获得最优的结构参数,利用高速摄像机开展流型测试。结果表明:该混合器结构简单、混合面积达6 152 mm^2,气泡最大比表面达0.94 mm^2/mm^3,在0~250 L/h气体流量范围内可获得稳定的泡流,在300~800 L/h气体流量范围内可获得稳定的段塞流,方便学生操作和进行流型学习;利用气泡最大比表面积法优化气液混合器结构是可行和可靠的,可推广应用。

The gas-liquid mixer is the key equipment to ensure the indoor air and water to successfully simulate the flow pattern in the production process of gas and oil. Based on the analysis of mix for water and air, and the structure and ways of the three types mixers, and in view of the gas-liquid two phase flow devices, a lateral convection type gas-liquid mixer with concentric tube is designed by UG NX. Based on the maximum specific surface area of bubbles method, the parameters are obtained, and the flow regime experiments are carried out. The results show that the mixer has a simple structure, a mixing area is 6 152 mm^2 and a maximum specific surface area of bubbles is 0.94 mm^2/mm^3. Stable bubble flow can be obtained in the range of 0-250 L/h gas flow, and stable slug flow can be obtained in the range of 300-800 L/h gas flow, which is convenient for students to operate and study flow pattern. It is feasible and reliable to optimize the structure of gas-liquid mixer by using the method of maximum specific surface area of bubbles, which can be popularized and applied.