Research On The Influence Of Attached Cavity Structure On Gas Explosion

At present,coal resources are still one of the main sources of energy consumption in my country.However,potential safety hazards such as gas explosions often occur in the process of coal mining,which seriously affect the safe mining of coal.Therefore,it is of great significance to carry out coal mine gas explosion suppression and disaster reduction research for coal mine safety.This paper mainly uses three methods of theoretical analysis,numerical simulation and experimental research to analyze the explosion flame and the explosion flame and the gas explosion caused by the gas explosion system with the cavity structure,the gas cavity structure and the gas cavity structure and the built-in ultrafine ABC dry powder.The impact of explosion shock wave propagation has important reference value for coal mine safety production.This paper analyzes the effects of three single-stage cavity structures of 300mm ×500mm × 200mm(length × width × height),500mm × 500mm × 200mm and 800mm ×500mm × 200mm in the gas explosion system by numerical simulations.It is found that due to the influence of the cavity wall structure,the shock wave is reflected and superimposed in the cavity structure,which affects the explosion flame and the explosion shock wave after passing through the cavity structure,and the length of the single-stage cavity structure is attached.When it increases gradually,the suppression effect on explosion temperature and explosion shock wave is greater;in order to deal with the possible leakage of gas in the cavity structure,the attached gas cavity of the same size was studied,and the single-stage gas containing cavity structure was obtained.As the length increases,the explosion temperature and shock wave overpressure in front of the structure gradually increase,and the explosion temperature and shock wave overpressure after the structure increase first and then decrease.On the basis of the numerical simulation results,a single-stage cavity structure with a size of 500mm X 500mm X 200mm was tested and researched,and the attenuation rate of the structure to the explosion flame and explosion shock wave overpressure was 55.25%and 17.84%,respectively.When a single-stage gas-containing cavity structure of the same size is attached,the flame size and the peak overpressure of the shock wave after the structure are increased by 67.55%and 45.45%respectively than those before the structure,which are 3.73 times larger than that of the single-stage cavity structure of this size.The peak overpressure increased by 1.8 times;in order to solve the above-mentioned explosion flame and shock wave overpressure increase,the structure built-in ultra-fine ABC dry powder was studied,and it was found that when the built-in ultra-fine ABC dry powder amount was 300g,the structure after Compared with the previous flame size and shock wave peak overpressure are not increasing,when the built-in ultra-fine ABC dry powder amount is 600g,the attenuation rate of explosion flame and shock wave peak overpressure is increased by 108.4%and 77.46%respectively compared with the attenuation rate of no built-in ultra-fine ABC dry powder..This paper analyzes the influence of the cavity structure of different sizes and different conditions in the gas explosion system on the gas explosion,and concludes that the ultrafine ABC dry powder built into the cavity structure has the best suppression effect on coal mine gas explosion,and the research results are for coal mine gas explosion.The explosion suppression and disaster reduction of accidents have important guiding value and practical significance.Figure 58 table 11 reference 96...