摘要
高含硫天然气管道经长期的内外腐蚀,经常发生泄漏事故。为了减少和降低天然气管道泄漏事故对人的危害,对甲烷及硫化氢的扩散规律进行研究日趋重要。利用计算流体力学的方法,采用仿真软件对高含硫天然气架空及埋地管道穿孔泄漏后的甲烷、硫化氢气体的扩散进行了数值模拟。架空管道泄漏初期为体积分数等值线呈对称分布的射流,泄漏至60 s后无爆炸危险;泄漏90 s后地面硫化氢体积分数较大,180 s后无中毒危险。埋地管道泄漏短时间内泄漏口地面附近聚集大量的高浓燃气,与架空管道泄漏相比地面其爆炸范围和中毒范围较低,但地面附近受危害的时间较长。为天然气管道的维修和安全输送提供了理论依据。
Because of long-term internal and external corrosion to the high sulfur-contained natural gas pipeline,the leakage accidents often occur.In order to reduce the harm to people due to gas pipeline leakage accidents,the research on the diffusion of methane and hydrogen sulphide is becoming more and more important.Methane and hydrogen sulfide gas diffusion from overhead and underground pipelines was numerically simulated by using computational fluid dynamics（CFD） method and simulation software.The result shows that in the early stage of overhead pipeline leakage,the volume fraction isoline presents a symmetrical distributing jet,and no explosion danger after 60 s;H2S volume fraction on the ground is higher after 90 s,and no poisoning danger after 180 s.The leakage of buried pipeline gathers a lot of high concentration gas near the surrounding ground of leakage point in a short time,and the explosion range and poisoning range of which are lower than those of overhead pipeline,but the time of hazard to the surrounding ground lasts longer.This simulation provides the theoretical basis for natural gas pipeline maintenance and gas safety transportation as well as environmental protection.
出处
《化学工程》
CAS
CSCD
北大核心
2011年第7期88-92,共5页
Chemical Engineering(China)
关键词
天然气管道
泄漏
数值模拟
natural gas pipeline
leakage
numerical simulation
