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首页> 外文会议>The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集 >Discharging and Diffusion Simulation and Explosion Risk Analysis of Urban Nature Gas Pipeline
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Discharging and Diffusion Simulation and Explosion Risk Analysis of Urban Nature Gas Pipeline

机译：城市天然气管道排放扩散模拟与爆炸危险性分析。

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摘要

In the crowded city zones, the serried high buildings will affect the discharging dispersion and flow field of nature gas pipelines greatly. A practical developed city was research as a case in this paper. The cubic geometry model was constructed, and the k-e turbulent diffusion model and SIMPLE arithmetic were adopted to simulate the turbulent diffusion field of urban nature gas pipeline leakage among buildings. The simulations were carried out with three pipeline inner pressure and ambient wind velocities. Based on the simulation results, the fire and explosion hazardous field of leakage gas were analyzed according to its explosion limits. The analysis results indicate that the turbulent diffusion of CH4 gas is influenced by the pipeline inner pressure, wind velocity and the surrounding buildings. At the same time, the diffusion field is greatly affected by the wind velocity which causes an obvious offset from the vertical axis. This phenomenon will increase the hazardous gas density and the risk level in the side of buildings against the air flow. This is meaningful for the construction of urban flammable pipelines.
机译：在人口稠密的城市地区，繁琐的高层建筑将极大地影响天然气管道的排放散布和流场。本文以一个实际发达的城市为例进行研究。建立了三次几何模型，采用k-e湍流扩散模型和SIMPLE算法对建筑物之间城市天然气管道泄漏的湍流扩散场进行了模拟。模拟是在三个管道内部压力和环境风速下进行的。根据仿真结果，根据泄漏气体的爆炸极限，对泄漏气体的着火和爆炸危险场进行了分析。分析结果表明，CH4气体的湍流扩散受管道内部压力，风速和周围建筑物的影响。同时，扩散场受风速的影响很大，风速会引起垂直轴的明显偏移。这种现象会增加有害气体的密度，并增加建筑物侧面的气流风险等级。这对于城市易燃管道的建设具有重要意义。

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