Abstract: The cyclone separator has high separation efficiency and is not easy to be blocked，it has good effect on the natural gas dewaxing. Numerical simulation of the two-phase flow of the CYG-S natural gas dewaxing cyclone separator was studied by using CFD software Fluent，and get the internal pressure，tangent and axial velocity distributions. The simulation and calculated cut size x50 in different inlet velocity are contrasted，the results has a good degree of agreement，so the two-phase simulation are reliable. The results show that the mass concentration of paraffin droplet is higher at the bottom of the cone section. With the increasing of the inlet flow，the separation efficiency of cyclone separator was improved，under the 1000 m3/h inlet flow，the x50 can reach 5.3 μm. However，in the studied range of inlet flow，the increase rate of the drop less than 5μm is not obvious. The lengthened of column and taper section increases the length of cyclone separator，extents the residence time of the droplets in the cyclone separator，and improves the separation efficiency of the cyclone separator.

Key words: cyclone separator, numerical simulation, separation efficiency, inlet flow, column and taper section length

摘要： 旋风分离器分离效率高，不易堵塞，用于天然气脱蜡效果显著。通过CFD软件Fluent模拟CYG-S型天然气脱蜡旋风分离器的两相流场，得到了旋风分离器内的压力、切向速度、轴向速度分布。对比了不同入口速度下的模拟与理论计算的分割粒径x50，发现具有很好的吻合度，两相模拟有一定的可靠性。结果表明：在旋风分离器锥段底部靠近壁面处的石蜡液滴质量浓度较高；随着进口流量的增加，旋风分离器分离效率提高，当进口流量为1000 m3/h时，x50可以达到5.3 μm；大粒径液滴的分离效果明显，但在所研究的进口流量范围内，进口流量的变化不能明显地影响粒径小于5 μm液滴的分离效率；柱段和锥段长度的增加使得旋风分离器的整体长度增加，延长了液滴在旋风分离器内的停留时间，提高了旋风分离器的分离效率。

关键词: 旋风分离器, 数值模拟, 分离效率, 进口流量, 柱段和锥段长度