LNG氣化站氣相管道天然氣泄漏擴(kuò)散的數(shù)值模擬與分析
[Abstract]:In recent years, with the rapid development of international natural gas market, China's natural gas market has entered a golden period. Liquefied natural gas (LNG) industry is an important part of natural gas field. In recent years, with the wide spread and application of LNG gasification station in China, the requirements for its construction and safe operation management are becoming higher and higher. In this paper, the leakage and diffusion process of natural gas in LNG gasification station is numerically simulated and some meaningful conclusions are obtained. Based on the theoretical analysis of gas jet theory, heat and mass transfer theory and numerical simulation research method, this paper puts forward a specific research scheme based on the existing research results in the background of actual engineering. Fluent,Tecplot software is used to build the model and post-process the simulation results. Combined with concentration field and velocity field, the effects of five factors, such as leakage aperture, wind speed, leakage direction, obstacle distribution and location of leakage source, on the leakage diffusion of natural gas are analyzed. Through the analysis of the simulation results, the following conclusions are drawn: the larger the leak aperture, the wider the distribution of the boundary range of the same gas concentration, and the more gentle the trend of the jet velocity decreasing with the increase of the distance; With the increase of wind speed, the injection distance of natural gas increases first and then decreases. The more the number of obstacles is, the stronger the limitation of gas diffusion is, the farther the leakage hole is from the barrier, the more obvious the barrier is to the natural gas in the wind, and the different leakage location is, because of the different surrounding environment, the gas diffusion range is different. These conclusions can not only guide the safety work of the plant and station, but also provide valuable theoretical support for the further study of this subject in the future.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TE88;TU996.9
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