Numerical Simulation And Analysis Of Natural Gas Leakage And Diffusion From Lng Vaporizing Station Gas Pipeline

In recent years, with the rapid development of international natural gas market, thedevelopment of the natural gas market in China has stepped into a golden period. Amongall natural gas fields, liquefied natural gas (LNG) industry is an important part. In recentyears, with the extensive promotion and application of domestic LNG gasification station,the requirement of stattion construction and safety operation management is higher andhigher. In this paper, the numerical study on leakage and diffusion of gas piped natural gasin LNG gasification station is conducted and meaningful conclusions are drawn from thesimulation results.Based on the existing research achievements, a detailed research approach on thebasis of practical engineering background is proposed by using jet theory, heat and masstransfer theory and numerical simulation method. Fluent and Tecplot are applied toestablish models and postprocess simulation results respectively. Combined withconcentration field and velocity field, the influence of leakage aperture, wind speed,leakage direction, obstacle distribution and leak location on the natural gas leakage anddiffusion was analyzed.The following conclusions can be drawn from the simulation results: With the greaterof the leakage aperture, gas concentration boundaries is more widely distributed, and thetrend of decreasing ejection speed is more gentle with the increasing distance; As the windspeed increases, the spray distance of natural increases first and then decreases. Because itis light gas, the danger zone of the lateral leakage near ground is bigger than verticalleakage; the more of the number of obstacles, the stronger the effect of gas diffusionlimitations. The farther the distance between the leak hole and the obstacle, the moreobvious the effect of obstacles on blocking natural gas movement.When the location of the leak is not the same, the surrounding environment is different. So gas diffusion range is different. These conclusions can not only guide theplant station security work, but provide a valuable theoretical support research on the topicdeeper level in the future as well.