| Along with the requirement of environment protection, the fuel changed step by step in the city of our country. At present, natural gas is widely used in residential area. Because of the character of natural gas, it also takes risk in using. The explosion limit of natural gas is low, if there is a release, it is easy to mix with air and becomes the mixed gas which may fire or explode under the action of flame, electrical flame or static flame. And the natural gas diffuses easily, fire or explosion may happen again when the fire fighting measure is not appropriate. If it happened, there are serious consequences for public and fire fighters. As the increasing use of natural gas, the relevant accidents are raised.So the researches of natural gas release from pipes and how to diffuse become the hot spots in safety science. Through studying all kinds of deficiencies in natural gas using, especially the reason of release, path and rule of release, improving prevention action and enhancing management, the loss could be minimized. The article aims at the natural gas's release in the house, analysis the diffusion process and effect factor, and make a simulative calculation about the velocity field and concentration field caused by release, it is very important for preventing and control fire in house.In order to make a systemic research for the process and development of natural gas release and dissusion, to provide emergency response support data, this article takes the living room as a research object. By learning and studying various models of gaseous diffusion at home and abroad, considering the feature of living room gas release, according to the principle of hydrokinetics, the article develops geometric model for gas release from kitchen, and makes a simulation about the dissusion state by Fluent, so that gaining the diffusion process, explosion limit area at different time and the range which kitchen achieve the explosion limit, at last, assesses the explosion consequence. |
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