| Increasing the urban infrastructure construction not only provides a material basis for the development of urban modernization,but also is an important measure to improve the living environment and improve the efficiency of urban operation.The State Council's"Opinions on Strengthening the Urban Infrastructure Construction"issued in September 2013 made it clear that,it plans to use three years to fully pilot the construction of pipeline gallery projects in 36large and medium-sized cities nationwide.The Ministry of Housing and Urban-Rural Development and the National Development and Reform Commission compiled the 13thh Five-Year Plan for National urban municipal infrastructure planning and construction on May25,2017.It summarized the main achievements of pipe gallery construction during the period of the 12th Five-Year and put forward the development direction of pipe gallery construction during the period of the 13th Five-Year.Compared with other fuel sources,natural gas has advantage in convenience,cleanness and high efficiency with huge demand.However,natural gas is flammable and explosive,and its safety problem is not optimistic.Therefore,whether the natural gas pipeline can enter the municipal comprehensive pipe gallery has become one of the hot issues of the industry.In this paper,the leakage and diffusion of natural gas pipeline in a municipal comprehensive pipe gallery of Beijing is taken as the research object,established a small hole leakage model for natural gas pipeline in independent pipe cabin.FLUENT software is used to simulate the leakage of 2cm aperture directly above and below the pipeline in three-dimensional space,obtained the diffusion rule after the pipeline leakage in the pipeline gallery.It also discussed the setting of the methane concentration probe in the pipe gallery and the issue of safe operation,and provided a reference for the design of natural gas pipeline entering the pipe gallery and operation management. |
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