天然气集气站场内输气管道小孔泄漏数值模拟

Numerical simulation of small hole leakage in gas pipeline in gas collecting station

主要对站场内输气管道小孔泄漏扩散的相关规律进行了研究。针对站场内输气管道小孔泄漏的实际情况,采用有限体积法对站场内输气管道的持续泄漏进行数值模拟。同时,在考虑风速、泄漏孔径、泄漏时间等这些对天然气小孔泄漏扩散的影响因素的情况下,用FLUENT15.0进行数值模拟并总结出泄漏扩散对站场风险的影响等相关结果。通过模拟研究得到:①风速越大,泄漏的天然气越容易扩散,且处于上风向区域的危险区域减小,处于下风向区的危险性增大;②泄漏时间越长,危险性越大;③孔径越大,危险区域越大;④对于天然气泄漏扩散的探测器位置优先选择位于下风向的区域和靠近障碍物背风侧的区域;⑤虽然小孔泄漏的泄漏孔小,但难以检测出来,随着泄漏时间的增长,所产生的风险也是不容小觑的,采用有效的措施,尽可能地杜绝危险的发生。

The main research of this paper is the relevant laws of leakage and diffusion of small holes in gas the pipeline in the station.In view of the actual situation of leakage in the gas pipeline in the station,the finite volume method was used to simulate the continuous leakage of the gas pipeline in the station.At the same time,in consideration of wind speed,leakage aperture,leakage time and other factors that affect the leakage and diffusion of natural gas pores,FLUENT 15.0 was used to carry out numerical simulations and summarize the relevant results such as the effect of leakage diffusion on station risk.Through simulation,the main conclusions are as follows:①The higher the wind speed,the easier it is for the leaked natural gas to diffuse;the higher the wind speed,the smaller the dangerous area in the upwind region and the bigger hazard ratio in the downwind region.②The longer the leak time,the greater the risk.③The larger the hole diameter of leakage,the bigger the danger zone.④The position of the detector located in the downwind direction and the area near the leeward side of the obstacle are preferentially selected for the position of the detector of natural gas.⑤Although the leakage hole is too small to detect it,the risk generated cannot be underestimated with the increase of the leakage time.Therefore,effective measures should be adopted to eliminate the danger as much as possible.