高含硫天然气管道泄漏扩散过程CFD建模

CFD Modelling of High Sulfur-containing Natural Gas Pipeline Leak and Dispersion Process

针对复杂地形条件下高含硫天然气管道泄漏扩散问题,建立基于Fluent的综合CFD仿真模型:计入管道瞬态泄漏质量和气体喷射对扩散的影响;利用DEM数据和曲线拟合方法建立三维地形模型;采用分区域的网格划分方法和近地面网格加密手段划分出全区域结构体网格;使用大涡模拟对气体扩散过程进行模拟。算例表明,该模型能够有效用于高含硫天然气管道泄漏扩散的精细分析,确定人员就地庇护范围、危险区域分布等重要参数,对于我国高含硫气田开发管道安全措施的制定具有良好的参考价值。

Aiming at the problem of high sulfur-containing natural gas pipeline leak and dispersion in complex terrain, an integrated CFD model was built based on Fluent. In this model, the effects of pipeline transient mass release rate and gas jet expansion process on dispersion were included, the 3D complex terrains are built by using DEM data and curve fitting method, computational domain was totally meshed with regular hexahedral elements through divisional mesh generation method and near surface grids refinement, and the gas dispersion process was simulated based on large eddy simulation theory. A numerical example shows that the model can be used effectively for the precise analysis of high sulfur-containing natural gas pipeline leak and dispersion process and the important parameters such as shelter area and main dangerous region can be determined. So it is a valuable reference for the establishment of pipeline safety measures in our country＇s exploitation of high sulfur-containing natural gas field.