摘要
在天然气管道集输过程中,由于管道老化、腐蚀等因素引起的泄漏事故时有发生,会引起穿孔泄漏后的天然气扩散,可能会引发火灾、中毒或爆炸。因此,进行架空天然气管道泄漏扩散过程的影响因素模拟研究及分析,对天然气管道输送安全运营和保障人生财产安全意义重大。文章建立了架空天然气管道在迎风坡和背风坡处发生泄漏扩散过程的物理模型,并利用CFD软件对架空天然气管道泄漏后的甲烷气体扩散过程进行了数值模拟。结果表明:泄漏的甲烷气体扩散范围和速度非常大,在泄漏时间300 s时泄漏距离已经达到40 m,并在40 m处形成高浓度的甲烷气团;泄漏点在背风坡时,山坡附近形成高浓度甲烷气团。
In the process of gathering and transportation of natural gas, leakage accidents caused by pipe aging, corrosion and other factors will occur occasionally, which would cause the diffusion of leaked natural gas, and would raise fire, poisoning or explosion. Therefore, the study and analysis of the simulation of the influencing factors of the overhead natural gas pipelines＇ leakage diffusion processes were done, which had great significance to the security operation of the natural gas pipeline transportation and the guarantee of life property safety. In this paper, the physical models of overhead natural gas pipeline＇s leakage diffusion process in windward slope and leeward slope were built. And the methane diffusions were numerically simulated by CFD software after the leakage. The results showed that the diffusion range and velocity are great, and diffusion scope is 40m when the leakage time is 300s, and the highly concentrated gas mass of methane occurred at the position of 40m; when the leakage point is in the leeward slope, the highly concentrated gas mass of methane of is formed near the hillside.
出处
《化工设备与管道》
CAS
2012年第4期61-63,共3页
Process Equipment & Piping
关键词
天然气管道
泄漏
扩散
Natural Gas Pipeline
Leakage
Diffusion
