石化管道丁烷气体泄漏扩散数值模拟

Numerical Simulation of Butane Gas Leakage and Diffusion in Petrochemical Pipelines

为研究石化管廊管道气体的泄漏扩散规律,以某化工园区石化管廊丁烷输气管道作为研究对象,采用CFD软件的Realizable k-ε模型对不同环境风速和泄漏初始速度下石化管道丁烷气体泄漏的扩散规律进行了数值模拟研究。结果表明:无风状态下,丁烷泄漏气体以射流形式从泄漏口喷出,爆炸极限区域集中于泄漏口上方;随着环境风速的增大,丁烷气体高浓度区域面积缩小,处于爆炸极限范围区域的面积扩大,危险区域面积扩大,丁烷气云整体呈上浮趋势;丁烷气体泄漏初始速度越大,丁烷泄漏气体自由扩散的作用越强,处于爆炸极限范围区域的面积越大,丁烷气云沉降趋势明显、纵深增加。

In order to study the law of gas leakage and diffusion in petrochemical piperack,this paper takes the butane gas pipeline of a chemical park as the object,and investigates the law of gas leakage and diffusion in petrochemical pipelines with different embient wind speed and initial velocity of the leaking gas by using the Realizable k-εmodel in CFD software.The results indicates that under the windless condition,the leaking gas ejects from the leakage area as a form of jet.Thus,the explosion limit area will deadly focus on above the leakage area.With the wind speed increasing,the area with heavy concentration butane will shrink,while the explosion limit area will expand which leads to a situation that the dangerous area expands and the whole cloud appears upward.The larger the initial velocity of the leaking gas is,the stronger the free diffusion of the leaking gas will be,and the larger the area of the explosion limit range is,the more obvious trend of gas cloud deposition will be and the deeper the gas cloud deposition will be.