地下输油管道泄漏污染物迁移过程仿真研究

发布时间：2018-01-19 02:26

本文关键词： 多孔介质污染物迁移多相流阻力系数　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：土壤作为一种常见的多孔介质,既承担着地下输油管道泄漏污染物的侵袭,又作为污染物的传递载体,易造成更为严重的二次污染。本文以土壤类多孔介质内污染物迁移特性为基础,通过理论和数值模拟研究地下输油管道泄漏污染物在多孔介质中的迁移规律,为地下输油管道泄漏检测技术提供更深入的理论基础,为污染土壤修复技术的工程应用提供参考依据。通过模拟流体在多孔介质区域内流动情况,分析土壤多孔介质变形场的作用影响;通过进行多孔介质阻力系数试验测定,分别讨论了多孔介质颗粒形状与粒径对阻力系数影响情况;通过对管道泄漏污染物在土壤中迁移的一维、多维模型建立及分析,讨论了管道泄漏石油污染物有源连续注入一维、多维迁移特点;并基于格子Boltzmann理论方法,采用Chapman-Enskog展开和多尺度技术,建立了求解管道泄漏污染物瞬时、连续注入一维方程的D1Q3模型,对管道泄漏污染物在土壤中瞬时、连续注入一维模型进行LBM(Lattice Boltzmann Method)模拟计算分析。分析结果表明:流体在错排粒子的排列区域内流动时获得较大的运动阻力;通过粒径较小、颗粒相对表面积较大的多孔介质时,受到较大的阻力作用;入口速度较小的流体产生相对较小的压力降。单相水在通过由0.8-0.9mm粒径组成的多孔介质区域时,受到的粘性阻力作用大于通过混合粒径所产生的粘性阻力作用,受到的惯性阻力作用小于通过混合粒径所产生的惯性阻力作用。水-白油32#混合液体在通过由粒径0.8-0.9mm组成的多孔介质区域时,受到的粘性阻力作用小于通过混合粒径所产生的粘性阻力作用,受到的惯性阻力作用小于通过混合粒径所产生的惯性阻力作用。当粒径条件相同时,单相水受到的粘性阻力作用较大,受到的惯性阻力作用较小。水-白油32#-空气多相流动时,白油32#绕过管道迁移至上方区域,泄漏口下方区域白油32#体积分数逐渐增大。不同时刻下,地下输油管道泄漏污染物瞬时、连续注入一维模型的LBM数值解与解析解的吻合度良好,为研究管道泄漏石油污染物的迁移问题提供了理论依据。
[Abstract]:Soil is a kind of porous medium, not only bear the underground pipeline leak pollution and invasion, used as a carrier of pollutants, causing more serious two pollution. Based on the characteristics of soil types of pollutant migration in porous media, through theoretical and numerical study of underground pipeline leakage of pollutants in the simulated migration in porous media, and provide a theoretical basis for further underground pipeline leak detection technology, to provide reference for engineering application of soil remediation technology. The flow in the porous media region through the simulation of fluid analysis, effects of soil deformation of porous media field; the resistance coefficient of porous medium test, porous media the particle shape and particle size on the impact resistance coefficient were discussed; through one-dimensional migration in soil on pipeline leakage of pollutants, Establishment and analysis of multidimensional model, discusses the pipeline leakage of oil pollutants active continuous injection of one-dimensional, multi-dimensional transfer characteristics; and based on the theory of lattice Boltzmann method, using Chapman-Enskog expansion and multi-scale technique, is established for pipeline leakage of pollutants instantaneous, continuous D1Q3 model into one-dimensional equations, the pipeline leak pollutants instantaneous in the soil, LBM one dimensional model of continuous injection (Lattice Boltzmann Method) simulation analysis. The analysis results show that the obtained motion greater resistance to flow arrangement region of particles within the fluid in the wrong row; the smaller particle size, particle relative surface area of porous medium large, under the action of greater resistance; fluid entrance velocity is smaller than the yields relatively small the pressure drop in the water through the porous media. The single-phase region by 0.8-0.9mm particle size composition, viscous resistance for more than by mixing by Effect of particle size of viscous resistance produced by the inertia role is less than the inertia effect of mixed particle size produced by water - oil. 32# mixed liquid in porous media by region with the grain size of 0.8-0.9mm composition, viscous drag by less than by viscous drag mixed particles generated by inertia the resistance is less than that by inertia effect of mixed particle size generated. When the particle size under the same conditions, the viscous resistance effect of single-phase water is larger, smaller inertia effect by water. - white 32#- air multiphase flow, oil migration to the area above 32# bypass pipeline, the leakage area below the white 32# the volume fraction increases gradually. At different times, the underground pipeline leak pollutants instantaneous, continuous injection of LBM one dimensional numerical solution and analytical solution of the model is in good agreement, for the study of pipeline leakage It provides a theoretical basis for the migration of leaking oil pollutants.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X74;X53

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