| In recent years, with China's increased demand for natural gas, the exploitation of it increases correspondingly. Because people are short of the spreading laws after the poisonous gas leakage, especially when people do not know well the urban complex terrain, such as mountains, hills, and buildings etc, it will lead to blind evacuation of personnel and sometimes delay the evacuation when a blowout accident happens, Therefore, rescuers will miss the best time to deal with emergencies which brings about a large number of casualties, property losses and ecological damage to the environment. Meanwhile, due to lack of adequate and effective data available to policy makers, it will delay the emergencies and sometimes blind disposal. It is evident that there is practical significance to make a research quantitatively on the special behavior of the proliferation of the blowout gas when taken complex terrain and complicated climate and environment factors into consideration.In this paper the deep cause of abrupt blowout accident is explored in theory of system security and way of numerical hydrodynamics, blowout gas diffusion is simulated, constituent of early warning system is researched the conclusion is shown below.1) Something is analyseed in theory of system security that fatalness of the abrupt blowout accident, factor of abrupt blowout accident broaden , and the deep cause of abrupt blowout accident.2) build blowout gas diffusion numerical model in the way of numerical hydrodynamics , explain the way of solving equation and utilizing boundary condition. simulate abrupt blowout accident in county kai of chongqing city with soft Fluent about hydrodynamics .Clear about numerical method correctness and achieve basic parameter of drainage area by the simulation of insufflation with velocity 10m/s 80m/s 150m/s . Clear about flow characteristic and gas diffusion law by simulation of drainage area before gas blowout and after gas blowout and process of gas diffusion . At last comparing the numerical conclusion and collected data ,we know lcoherence between them.3) Based on analyzing conclusion about accident and numerical conclusion, bring forward concept of Blowout entrench area and analyze influencing factors , advanced fateful blowout accident early warning system and disposal formality. |
