| In recent years,the development and utilization of natural gas has attracted more attention all around of world,which is a kind of clean and efficient fossil energy.On a global scale,storage capacity of natural gas is much larger than which of oil resources,and there are adequate resources support its development and utilization.In a growing trend of emphasis on environmental pollution and air quality,future natural gas must become the world's largest consumer of energy instead of oil and will plays an important role in human civilization from the old energy to the new energy in the process.It has proven that the sour gas amount to a quarter of gas resource in our country.With the increasing need of nature gas,more and more sulfur even high-sulfur natural gas wells will be mined.The accident in extraction process of high-sulfur natural gas always occur worldwide,especially the gas fields with high sulfur content,high pressure,and high production(the three high risks in gas field).Thus,in order to simulate and predict the high sulfur gas diffusion range and diffusion concentration distribution at the first time of natural gas blowout accident rapidly and accurately,on the other hand,to effective organize the evacuation of the affected area of personnel and reduce casualties and property losses,creating a visual simulation to the dynamic behavior of the gas diffusion systems in the real three-dimensional terrain is necessary.The main research contents and results include:(1)A mountainous terrain of Gong county in Sichuan Yibin was selected by the GIS software SkylineGlobe.Then,a 3D simulation scene which require herein identical with real world was created on this terrain by the API of SkylineGlobe;Establish the Earth's surface ground coordinates(longitude,latitude,altitude)correspond to the spatial coordinate system in this scenario,determine the sampling frame and sampling to establish the respective box.(2)Amidst Gaussian model was chose as the basis of the numerical model of the system,and the C#programming language was used to develop the calculation program of gas diffusion concentration spatial distribution,which was developed in Visual Studio 2010 integrated development environment(IDE).Furthermore,based on the Net Framework4.0 operating framework,using the GIS system superimposed 3D simulation created scenes,a kind of three high gas diffusion simulation system based on GIS was designed and developed in the use of 3D simulation scenes which created by GIS..(3)In this research,based on the diffusion simulation system,gas dynamic diffusion process in a real three-dimensional terrain system was simulated at different parameters,including average wind speed,real-time wind direction,wind pitch,source release rate and atmospheric stability and the concentration distribution was obtained.In addition,the influence of these parameters was respectively discussed(4)By calculating the poison gas concentration of respective sample box in the diffusion region,according to the relationship between hydrogen sulfide harm to human body size and concentration,different concentration areas were ranges into high-risk area,mid-risk area,low-risk area.And,in connection with the real three-dimensional terrain and dynamic gas diffusion simulation in damage areas,the emergency treatment in each hazard area was proposed. |
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