复杂地形高含硫输气管道环境风险事故模拟

Simulation of environmental risk accident of high sulfur-content gas pipeline in complex terrain.

以四川"普光气田"高含硫输气管道为研究对象,采用地随坐标三维客观诊断风场以及Lagrangian烟团模型,对复杂地形区高含硫输气管道发生断裂事故的H2S扩散情况进行了模拟.结果表明,H2S的分布并非主要发生在下风向区域,而是由于受山体阻挡,在山前堆积或发生翻越、绕流呈跳跃式分布.山腰接近山顶和低洼河谷处断裂点模拟对比表明,断裂点越高,污染物扩散条件越好.风险敏感点的分布决定管道断裂环境风险大小,将H2S扩散结果与研究区内居民点分布相结合,综合判断位于高处的断裂点环境风险小于低洼处点,因此建议管道建设沿地势较高的等高线进行敷设.

Using high sulfur content pipeline of Sichuan ＂Pu Guang gas filed＂ as studied object and adopting land following coordinate three dimensions objective diagnosis wind field and Lagrangian smoke model on the H2S diffusion condition of rupture accidents produced in the high sulfur content pipelines of complex terrain area was simulated. The H2S distribution did not occurre mainly in low wind direction, and due to the obstruct of mountain＇s body, accumulated in front of mountain or produced turn over, flowed around, submitted jumping type distribution. The mountain waist near hilltop and low hollow rivers valley site rapture points simulating contrast showed that the higher the rapture point, the better the diffusing condition of pollutant, the distribution of risk sensitive point decided piping rupture environmental risk size, combining the H2S diffusion result and residential area dispersing in the studied area, synthetic judge that environmental risk located in the high rapture point was smaller than the low hollow point, thus it was suggested to carry out laying of lining build of equal high line of higher terrain.