缓蚀剂液膜分布规律的数值模拟

发布时间：2018-04-27 03:38

本文选题：缓蚀剂 + 输气管道　；参考：《排灌机械工程学报》2017年01期

【摘要】：为了实现后续正常加注工艺对缓蚀剂膜的有效修复、补充,保证缓蚀剂的防腐蚀作用,对目标管段内缓蚀剂预膜层分布情况以及随流动情况变化规律进行研究,使用Fluent软件,基于欧拉-欧拉模型,建立RNG k-ε双方程模型描述管道内复杂的湍流流动,采用VOF模型模拟预膜工艺形成的缓蚀剂液膜在管壁的流动规律,计算预膜工艺形成的缓蚀剂液膜在气流作冲刷和重力作用下沿输气管道内壁分布情况以及缓蚀剂表面张力对液膜分布的影响.结果表明:缓蚀剂液膜在重力作用下向管底沉降,约占管道截面的1/3,弯头部位二次旋涡的存在会破坏缓蚀剂液膜原有的分布,向二次旋涡夹带方向移动,所以在工程实际中应重点监测这些部位.表面张力越大,壁面黏附功越大,壁面处缓蚀剂分布越均匀并且含量越高,最高缓蚀剂含率可以达到100%.因此在预膜工艺时,推荐选用壁面黏附性强且表面张力大的介质.
[Abstract]:In order to realize the effective restoration and supplement of corrosion inhibitor film and ensure the anticorrosion effect of corrosion inhibitor, the distribution of corrosion inhibitor prefilm and its variation with flow in the target pipe were studied, and the software Fluent was used. Based on the Euler-Euler model, the RNG k- 蔚 two-equation model was established to describe the complex turbulent flow in the pipeline. The VOF model was used to simulate the flow pattern of the corrosion inhibitor liquid film formed by the pre-membrane process in the tube wall. The distribution of inhibitor film along the inner wall of gas pipeline under the action of air flow and gravity and the effect of corrosion inhibitor surface tension on the distribution of liquid film were calculated. The results show that the corrosion inhibitor liquid film settles to the bottom of the tube under the action of gravity and accounts for about 1 / 3 of the section of the pipeline. The existence of secondary vortex at the elbow will destroy the original distribution of the inhibitor liquid film and move towards the entrainment direction of the secondary vortex. Therefore, in the engineering practice should focus on monitoring these parts. The higher the surface tension, the greater the wall adhesion work, the more uniform the corrosion inhibitor distribution and the higher the content at the wall. The highest corrosion inhibitor content can reach 100%. Therefore, the medium with strong wall adhesion and high surface tension is recommended in the prefilm process.
【作者单位】：中国石油大学多相流分离工程技术中心;
【基金】：山东省自然科学基金资助项目(ZR2014EL028,BS2014ZZ014)
【分类号】：TE988.2;TG174.42

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