CFD技术在油气分离器选型和设计中的应用

利用CFD数值模拟方法,气相采用RNGκ-ε湍流模型,油滴相采用随机轨道模型,对油气两相流在一次油份内的流动分布进行研究,分析油滴在分离器内的运动轨迹及分离机理。计算结果表明:油气分离器的长径比越大其分离效果越好;当入口速度较大时,增大分离器容积可提高分离效率;当入口速度较慢时,即使增大容积其分离效果也不会得到明显的改善;分离器入口速度越大分离效果越理想。在工程应用中,利用以上分析结论进行选型和尺寸设计的油气分离器可以满足实际要求,并取得理想的分离效果,同时验证了采用的方法切实可行。

Application of CFD Technique in Design and Selection of Oil and Gas Separator

By using CFD numerical simulation, and with RNG k - e model for gas and random track model for oil phase, both the research of the distribution of oil and gas comhined phase in mixed oil and the analysis of the moving track and separation mechanism of the oil drop in separator were carried out. The calculation result has shown that the ratio of length and diameler larger, the separation effect better. While the velocity at inlet is comparatively fast, to enlarge the volume of separator will increase separation efficiency; however, while the velocity at inlet is comparatively slow, there will he no apparent improvement in separation efficiency even if the volume of separator is enlarged. Thus, the faster the velocity at inlet, the better the separation efficiency. In engineering practice, the above analysis and conclusion can he used to design or select oil and gas separator so as to obtain expected separation effect and, then, to reach the requirements in engineering. The method presented in this article has been validated in practice.