基于瓦斯气体中细水雾的正态分布式弧形板除雾器分离效率的数值模拟

Numerical Simulation of Separation Efficiency of Normal Distributed Arc-plate Demister Based on Water Mist in Gas

为了进一步提高瓦斯气体中细水雾的分离效率,优化设计出正态分布式弧形板除雾器。采用Fluent6．3软件对正态分布式弧形板除雾器内的气雾两相流动进行数值模拟。通过调节参数,计算得到了多种结构参数和工况参数下除雾器的分离效率,并分析了各参数对除雾器分离效率的影响规律。研究结果表明,在相同结构参数下工况参数的变化对除雾器效率的影响较为明显,同时进一步得出适合不同雾滴直径的叶片结构组合型式：在叶片长度H=150 mm,转折角α=60＆#176;,板间距L=20 mm时,可以除去10~20μm的雾滴；在叶片长度H=150 mm,转折角α=90＆#176;,板间距L=30 mm时,可以除去20μm以上的雾滴。以上模型有助于优化除雾器的结构设计。

A normal distributed arc-plate demister was developed by optimization design in order to further improve the separation efficiency of water mist in the gas. Fluent 6. 3 Software was employed for the numerical simulation of the two-phase flow of gas and mist in the normal distributed arc-plate demister. By adjusting the parameters, the separation efficiency of the demister in various structural parameters and operating parameters was calculated and the impact of various parameters on the separation efficiency of the demister was analyzed. The research results showed that change of the operating parameters had evident influence on the efficiency of the demister under the condition of the same structural parameters, and in addition, different structural combination modes of vanes suitable for different droplet diameters were further obtained：the mist droplets in 10-20μm can be removed when the length of vane is 150 mm, the turning angle is 60＆#176; and the plate spacing is 20 mm;the mist droplets in more than 20 μm can be removed when the length of the vane is 150 mm, the turning angle is 90＆#176; and the plate spacing is 30 mm. The above modes are helpful to optimize the structure design of the demister.