G-LISR不同气相入口流速对流场特性的影响

发布时间：2018-04-21 03:08

  本文选题：气液两相撞击流 + 撞击流反应器　； 参考：《化学反应工程与工艺》2017年03期

【摘要】：为了提高气液撞击流反应器(G-LISR)的混合性能,找到合适气相入口速度的操作参数,采用ANSYS Workbench中的Geometry模块,基于欧拉·拉格朗日法建立G-LISR气液两相流动数学模型。在加速管对置距离为400mm,液相入口速度为5m/s,三种不同的气相入口速度(10,15,20m/s)条件下,用数值模拟软件Fluent分析模拟出了不同气相入口流速下反应器内流场的分布特征。模拟结果表明:随着气相入口初始流速的增大,反应器内湍流强度有所增加,在压力波动最为剧烈的撞击面中心点处,压力急剧增大。增大气相初始流速,将降低反应器中的液滴的浓度分布,减少了液相在反应器中的停留时间。从能量损耗和气液两相在反应器中的混合效果来看,气相初始流速不宜过大,10m/s为较佳。
[Abstract]:In order to improve the mixing performance of gas-liquid impinging flow reactor (G-LISR) and find the appropriate operating parameters of gas inlet velocity, the G-LISR gas-liquid two-phase flow mathematical model was established by using the Geometry module in ANSYS Workbench and based on Euler Lagrangian method. Under the conditions of 400 mm set distance of accelerator tube, 5 m / s liquid inlet velocity and three different gas phase inlet velocities of 10151520m / s, the distribution characteristics of reactor inner flow field at different gas inlet velocities were simulated by numerical simulation software Fluent. The simulation results show that the turbulence intensity in the reactor increases with the increase of the initial velocity of the gas inlet, and the pressure increases sharply at the central point of the impingement surface where the pressure fluctuates most intensely. The increase of initial gas flow rate will reduce the concentration distribution of droplets in the reactor and reduce the residence time of liquid phase in the reactor. From the point of view of the energy loss and the mixing effect of gas-liquid two-phase in the reactor, the gas phase initial velocity should not be too large or 10 m / s.
【作者单位】： 武汉工程大学机电工程学院;武汉鑫瑞泽科技有限公司;
【基金】：国家自然科学基金(51276131)
【分类号】：TQ052
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本文编号：1780648