平坦地区含硫化氢集输管道的泄漏扩散模拟

NUMERICAL SIMULATION OF SULFURED HYDROGEN-CONTAINING GAS PIPELINE LEAK AND DIFFUSION ON FLAT AREAS

针对管道中天然气的泄漏,尤其是含硫集输管道的泄漏将对周围环境造成极大的威胁,对平坦地区含硫化氢天然气管道泄漏扩散进行了数值模拟。模拟分析发现:静风条件下,天然气在大气中自由扩散稳定后,压力、速度和浓度分布基本对称,喷口附近、喷口垂直向上区域以及接近地面区域的硫化氢浓度很高,属于高危险区域;有风条件下,气体扩散范围增大,风不仅对污染物起输送作用,还起稀释扩散作用,但在地面附近影响效果并不明显,而随高度的增加,其效果将不断增强;在无风情况下,喷射区域基本在泄漏口正上方,而有风时,喷射区域发生弯曲;危险区域随着风速的增大而减小,静风时,其范围最大。模拟得出天然气管道泄漏点外扩散的规律能够为实际安全生产和应急抢险提供较好的参考依据。

In view of the gas leak in pipeline,especially,the sulfured hydrogen-containing gas pipeline leak will greatly threaten the nearby environment,the numerical simulation is carried out about the sulfured hydrogen-containing gas pipeline leak and diffusion on flat areas.The simulation indicates that under the condition of static wind,when gas diffusion gets stale in air,its pressure,speed and the distribution of concentration are basically symmetric.The concentration of sulfured hydrogen is quite high at the zones near the jet hole,above the jet hole and near ground,they are danger zones.When wind blows and the scope of diffusion gets larger,wind will play the role of lightening diffusion,the effectiveness will increase as height increases.While without wind,the jetting area is located above the leaking hole,and jetting area comes to deform when wind is blowing.As wind speed increases,the danger area decreases in size.Simulating the law of gas pipeline leaking point diffusion can provide reference to safe production and emergency response.