Analysis Of Gas Leakage And Explosion And Research On Improvement Measures Of Integrated Stove

As a new type of kitchen stove,the integrated stove has been developing rapidly in recent years while frequent safety accidents.Due to the poor ventilation inside the integrated stove,and the gas and electrical appliances have not taken effective isolation measures,it is easy to form accumulation inside once gas leakage occurs,there is a risk of combustion explosion caused by electronic spark ignition.At present,there are few safety researches on integrated stove products,and the corresponding standards and specifications are not perfect.Therefore,it is necessary to carry out relevant research on gas leakage and explosion of integrated stove and improvement measures,and lay a technical foundation for relevant departments to implement integrated stove product quality supervision and product safety performance improvement.In this thesis,the micro-leakage of the integrated stove was taken as the research object.Based on the basic control equations such as mass conservation,momentum conservation,and energy conservation,the fluid mechanics software Fluent was used to numerically simulate the micro-leakage and explosion process of the liquefied petroleum gas(LPG)in the internal cavity of the integrated stove.The law of diffusion and distribution of LPG inside the integrated stove was analyzed,the law of flame propagation and explosion overpressure propagation after the explosion was explored,the degree of damage caused by the explosion overpressure to the integrated stove was evaluated,the improvement measures to increase the vent area and to optimize the position of the vent were proposed,the best detection position of the LPG leak detection sensor was proposed after research.In the early stage of the leakage,the LPG diffused rapidly from the leakage source to the lower layer of the internal cavity,while in the later stage,it diffused from the bottom of the internal cavity to the top at a slower rate.The spatial distribution of the LPG concentration of the integrated stove will reach a stable state after a period of leakage.The greater the leakage flow rate,the longer the time for the spatial distribution of the concentration to stabilize,and the higher the proportion of combustible areas after stabilization.The temperature around the ignition area is low,and the flame front propagation speed and temperature rise are relatively slow at the initial stage of the explosion.After encountering obstacles and constraints,the flame front will stretch and deform,and at the same time accelerate the flame propagation speed.The overpressure values in different areas inside the integrated stove at different time points were obtained quantitatively.There are two overpressure peaks.The peak overpressure will cause severe damage to the tempered glass of the integrated cooktop.Increasing the area of the vent and optimizing the location of the vent are helpful to reduce the peak value of explosion overpressure,and reduce the risk of explosion and the degree of damage after the explosion.The optimal detection position of the LPG leak detection sensor is proposed,which is helpful for more timely detection and early warning of the minor leakage of LPG in the integrated stove.