Indoor Gas Hose Leakage Numerical Simulation And Hazard Prevention

Indoor gas pipe systems leak, leakage of gas to reach the explosive limit encounter an ignition source, fire explosion, according to the statistics of industrial accidents in recent years, indoor gas leakage accident most of them are caused by the gas pipeline hose off. Indoor gas pipe hose off as the research object, the first based on the theory of hydraulic fluid to establish a computational model of the ring gap between the hose and pipeline leakage, the use of numerical simulation analysis the means of influencing factors of the ring slit leakageanalysis, the ring gap leakage law; and indoor gas leak toxic diffusion, a quantitative analysis of fire and explosion hazards, combined with the process of the development of indoor gas explosion explosion suppression mechanisms and preventive measures.In this paper gas pipeline leakage calculation of steady-state model and dynamic leakage computational model, given the current state of the ring gap between the indoor gas pipe and hose to determine the formula, refer to the relevant theory of hydraulic fluid flow conditions, based on simplifying assumptions,establish a computational model of the ring gap leakage, including concentric rings gap leakage computational model, computational model of eccentric ring slot leakage and hose and pipe there is relative motion gap leakage computational model. Reference to the actual residents of the kitchen indoor gas pipelines were instance of analytical calculations and numerical simulation calculations, commercial software applications of computational fluid dynamics, numerical simulation of indoor gas pipe hose off caused by the leakage was simulated, with emphasisanalysis of the pipeline pressure, gap width, the composite length of hose and pipe, and pipe diameter size of the leakage. Obtained the gap width is the most obvious effect of the leakage, the decisive factor of the leakage, pipeline pressure and pipeline diameter is proportional to the amount of leakage, composite hose and pipe length is inversely proportional to the amount of leakage. Comparative analysis of the value of the theoretical calculations and numerical simulation, both the result of error is maintained at about 10%, showing the trend is basically the same, according to the above conclusion summed up to minimize the actual indoor gas engineering the small hose off the leakage measures.Consequences of indoor gas leak is divided into the proliferation of toxic gases, fires and explosions, quantitative hazard analysis of the consequences of leakage; toxicity diffusion diffusion model based on a variety of leak, all influencing factors to determine the range of toxic damage, according toto determine the size of the toxic load toxic damage area; fire hazard, according to the fireball fire, flashover fire and jet fire three fire damage in the form, by calculating the thermal dose, the heat flux and time quantitative determination of the scope of fire thermal radiation damage; analysis of the method of calculation of explosion limits, determined using the calculation method of the multi-component combustible gas mixture explosion limit, give priority to the use of the estimates of TNT equivalent explosive damage effects, and blast overpressure hazard estimates explosiondamaging effects are considered personal injury and damage effects on buildings, the discussion focused on the population mortality probability calculation.Indoor gas leak explosion causes and accident stage of development, according to the simplified isothermal model of an explosion, given the formula of the maximum explosion pressure of civil kitchen:According to the theory of disaster prevention, indoor gas leak explosion to eliminate combustion and explosiona necessary condition for strictly regulate the supply of enterprises and to strengthen the preventive measures such as client management; and combine the characteristics of indoor gas leak explosion, the emergency response plan after the accident.