涡流式分离器气液两相分离数值模拟研究

对于气液两相分离，传统分离器或体积过大，或旋流强度低，因此考虑提出一种新式的涡流式分离器。利用涡流二极管逆向流动形成强度较高旋流的特点，在旋流腔上方加入一根支管，从切向入口进入的两相流由于密度差和旋流的作用，气相会聚集在中心由于浮力作用从上支管流出分离器，液相会分布在四周由于重力作用从下支管流出分离器，从而实现两相分离。采用数值模拟的方式分别对不同旋流腔尺寸以及出口形状的分离器进行计算，模拟结果表明，在进口流量为0.5 t/h、入口含气率1%～5%工况下，控制底流口压力和入口相同，溢流口与入口压差在80～90 kPa范围内，分离器对粒径在50～100μm的气泡分离效率可以达到90%以上。

Numerical Simulation of Gas-liquid Two-phase Separation in Vortex Separator

For gas-liquid two-phase separation, traditional separators are either too large in volume or low in swirling intensity. So a new type of cyclone separator is proposed. Utilizing the reverse flow of vortex diode to form a high-strength swirling flow, a branch pipe is added above the swirling chamber. For the two-phase flow entering from the tangential inlet, due to the density difference and swirling flow, the gas phase will gather in the center and flow out of the separator from the upper branch pipe due to buoyancy, and the liquid phase will be distributed around the separator from the lower branch pipe due to gravity, thus realizing the separation of the two phases. The separators with different swirling chamber sizes and outlet shapes are calculated by numerical simulation. The simulation results show that under the working condition that the inlet flow is 0.5 t/h and the inlet air content is 1%~5%, the pressure at the control underflow port is the same as that at the inlet, the pressure difference between the overflow port and the inlet is 80~90 kPa, and the separation efficiency of the separator for bubbles with a diameter of 50 μm and 100 μm can be above 90%.