新型螺旋管气液分离器分离性能数值模拟

Simulation of gas-liquid separation performance of spiral gas-liquid separators

采用计算流体力学方法,选择双流体模型和RNGk-ε湍流模型对新型未开孔螺旋管气液分离性能进行数值模拟,分析螺距、管径等结构参数及液体黏度、入口速度、入口含气率等操作参数的分离效果.结果表明:在螺距为26.67和47.22mm,在入口速度为1～30m/s时,增加螺距或入口速度可以改善分离效果.当入口速度较大时,减小管径可以改善分离效果;反之,当入口速度较小时,增大管径可以改善分离效果.减小液体黏度,可以改善分离效果.这可为螺旋管的开孔方案、分离性能实验及工程应用提供指导.

Adopting computational fluid dynamics method, selecting two-fluid model and RNG k-ε turbulence model, the new non-holed spiral pipe is numerically simulated to predict its gas-liquid separation performance. The influence on gas-liquid separation of the spiral caused by the structural parameters of pitch and pipe diameter, and the operating parameters of liquid density, liquid viscosity, inlet velocity and gas void fraction are analyzed respectively. The results show that the separation effect can be improved by increasing the pitch, liquid density, or inlet velocity within a certain range. The separation effect is improved with the decreasing of pipe diameter when the inlet velocity is relatively high. On the contrary, the separation effect is improved with the increasing of pipe diameter when the inlet velocity is low. The decrease of liquid viscosity is favorable to the separation effect. These conclusions can be guidance for the subsequent hole drilling, separation experiment verification and practical engineering application.