摘要
针对埋地输气管道的特点,建立埋地输气管道持续泄漏模型,运用有限容积法,对比分析多孔介质对天然气埋地天然气管道泄漏气体扩散的影响,得出管道上层土壤作为多孔介质,对气体扩散有重要的影响,由于其土壤阻力和毛管压力作用,使气体在地下消耗大量湍能,气体在地下危险区域呈下窄上宽,而在地上由于气体湍能减小,加上大气压的作用,致使气体危险区域呈上窄下宽。结计算结果为埋地天然气管道合理设计管道区域,指导管道敷设和安全运行提供理论指导。
According to characteristics of buried gas pipelines, a continued leak model of buried gas pipelines was established. Effect of porous media on leak and gas diffusion of buried natural gas pipelines was compared and analyzed by the finite volume method. The results show that the soil above the pipeline as porous media has important effect on gas diffusion; since the effect of soil resistance and capillary pressure, lots of turbulent energy of the gas can be consumed, and the dangerous area is narrow in the lower layer and wide in the upper layer under the ground, but above the ground, since the decreasing of gas turbulent energy and the effect of atmospheric pressure, the gas dangerous area is narrow in the upper layer and wide in the lower layer. The calculate results can provide a theoretical guidance for design of buried pipeline, pipe laying and safe operation.
出处
《当代化工》
CAS
2012年第10期1101-1103,共3页
Contemporary Chemical Industry
关键词
天然气管道
多孔介质
泄漏
甲烷
数值模拟
Natural gas pipeline Porous media
Leak
Methane Numerical simulation
