三角形管壁叶片式静态混合器的结构与流场数值模拟

Structure of the Triangular Tube-wall-blade Static Mixer and Numerical Simulation of Its Internal Flow Field

为满足造纸生产过程通过静态混合器添加各类化学品的发展要求,同时为解决传统静态混合器的挂浆、破坏某些高分子化学品结构、混合器结构复杂和易堵塞不易清理等问题,研发了三角形管壁叶片式静态混合器,其内部特征结构为3个取自管壁的叶片呈120°均匀分布于管壁内侧;利用FLUENT软件对其工作过程的内部流场进行数值模拟,并建立一套实验装置以对模拟结果进行验证。FLUENT的流场模拟分析结果表明,该静态混合器可使内部流场在压力、速度大小和方向、流体湍流情况发生有效变化,进而使流体物料充分混合;与目前常用的标准型Kenics静态混合器相比,三角形管壁叶片式静态混合器具有简单、高效、节能、不易挂浆和不易剪切破坏高分子类化学品结构的特点,可对流体物料进行分流和混合。

In order to meet the development requirements of more and more chemicals added through static mixers in papermaking process,and to overcome the shortcomings of traditional static mixer,such as the complex structure of the mixer,the difficulty of cleaning up,common occurance of plugging and damaging the structure of some added polymer chemicals,a new type of static mixer with triangular tube-wall-blade was developed.The internal structure characteristic of the device was that 3 blades from the tube-wall were evenly distributed on the inner wall of the tube with 120 degrees.The internal flow field in working process was simulated by FLUENT software,and an experimental device was established to verify the simulation results.The flow field simulation analysis of FLUENT showed that the static mixer could make the internal flow field change effectively in pressure,velocity,direction and fluid turbulence,and then mix the fluid material fully.Compared with the commonly used Kenics standard static mixer at present,the new static mixer with the triangular tube-wall-blade was simple,efficient,energy saving,not easy to happen adhereing the pulp to the blade and the tube wall,and not easy to destroy the structure of polymer chemicals.It could divert and mix fluid materials.