Discharging and Diffusion Simulation and Explosion Risk Analysis of Urban Nature Gas Pipeline

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.

关键词： urban nature gas pipeline leakage and dispersion numerical simulation explosion risk analysis

作者: LIU Zhenyi QIAN Xinming LIU Mu

作者单位: State Key Laboratory of Explosion Science and Technology,Beijing institute of Technology,Beijing 100081,China

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 344-348

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）