埋地管道泄漏油品扩散范围模拟计算

Simulation Analysis of the Range of Soil Spread by Buried Pipeline Leakage

要对埋地管道不同位置泄漏时油品在土壤中的渗透扩散进行模拟分析,借助CFD软件建立土壤多孔介质中油水两相流的三维流动传质耦合模型。模拟结果表明:油品在地下、地表的渗透扩散范围受漏孔位置的影响明显。管道正上方泄漏时,地下泄漏范围最小而地表扩散面积最大;管道正左侧泄漏时,地下扩散范围及地表扩散面积大小介于正上方泄漏和正下方泄漏工况之间;管道正下方泄漏时,地下扩散范围最广,但地表扩散面积最小。泄漏1h后,地下、地表的油品扩散速率均趋于稳定,下孔泄漏油品的地下扩散速率比上孔泄漏大约10%,而3种泄漏工况的地表扩散速率大小几乎相同。

Based on the simulation analysis of penetration and diffusion of leaking oil in different parts of buried pipeline,a three dimensional coupled flow and mass transfer model of oil-water flow in the soil porous media can be built by CFD.The results show that the penetration and diffusion scopes of leaking oil underground or on the earth＇s surface can be affected apparently by the location of leak of buried pipeline.In the case of the leak happening in the part directly above the buried pipeline,the minimum diffusion scope is the underground diffusion scope meanwhile the maximum diffusion scope is the surface diffusion scope.In the case of the leak happening in the left-hand side directly above the buried pipeline,the values of diffusion scopes either underground or on the earth＇ surface are located between the first case and the last case.In the last case of the leak happening in the part directly below the buried pipeline,its value is just the inverse of the first case,that is,the maximum diffusion scope is the underground diffusion scope meanwhile the minimum diffusion scope is the surface diffusion scope.After 1 hour＇s leakage, the diffusion rates of both underground and surface cases tend to be stable.The underground diffusion rate of the last case is greater than the rate of the first case by about 10%,and the surface diffusion rates of these three cases are almost the same.