气相乙烷管道泄漏扩散特征模拟分析

Simulation and analysis of leakage and diffusion characteristics of gas phase ethane pipeline

为研究气相乙烷管道泄漏扩散后的影响,以某公司拟建的一条乙烷输送管道为工程背景,采用CFD(计算流体动力学)软件,对不同泄漏孔径、不同风速下的气相乙烷管道泄漏进行了模拟分析,探讨其泄漏扩散特征以及危险范围的演变情况。结果表明:随泄漏孔径增大,乙烷的扩散形状发生改变,小孔泄漏扩散在土壤中的形状演变特征分为前、中、后期3个阶段,而管道全尺寸泄漏在大气中的扩散分为无风时的垂直射流扩散以及有风时的横向扩散;随泄漏孔径的增大,乙烷泄漏扩散范围变大,危险区域变大;随风速增大,乙烷全尺寸泄漏扩散高度降低,且危险浓度最远扩散距离达到峰值的时间缩短。

In order to study the impact of gas-phase ethane pipeline leakage after diffusion,an ethane transmission pipeline proposed by a company was used as the engineering background.CFD(computational fluid dynamics) software was used to simulate and analyze the leakage of gas-phase ethane pipeline with different leakage orifice sizes and different wind speeds,and to explore the leakage dispersion characteristics and the evolution of the hazard range.The results show that the shape of ethane diffusion changes with the increase of leak aperture diameter,the shape evolution of small-aperture leak diffusion in soil is divided into pre-,mid-and late-stage,while the diffusion of full-size pipe leak in the atmosphere is divided into vertical jet diffusion in the absence of wind and lateral diffusion in the presence of wind.With the increase of leak aperture diameter,the diffusion range of ethane leak becomes larger and the danger area becomes larger.With the increase of wind speed,the diffusion height of full-size ethane leak decreases and the danger area becomes larger.With the increase of wind speed,the diffusion height of the full-size ethane leak decreases,and the time to reach the peak of the farthest diffusion distance of the dangerous concentration is shortened.