Determination Of Propane Gas Explosion Characteristic Parameters And Numerical Simulation Of Dispersion

Propane is an inexpensive,clean energy source that can be used as fuel,refrigerant,and chemical material.In the process of storage and use,leakage and explosion accidents are imppened quickly,which brings severe damage and considerable risk.Through studying the propane leakage and dispersion process and measuring the explosion parameters,the characteristics of propane leakage,dispersion,and explosion can be obtained and the protective measures can be provided.Experimental analysis and numerical simulation of the explosion parameters of propane and leakage and dispersion were respectively studied.The experiment tested the propane under ammospheric pressure of explosion limit,maximum explosion pressure and the maximum explosion pressure of time,calculated the risk of explosion and deflagration index,analyzed the propane gas explosion pressure along with the gas concentration and time.The effect of agtiotion energy on the maximum explosion pressure of propane explosions at different cancentrations was studied.According to the experimental results,the accuracy of FLACS simulation software is verified,and the parameters of propane leakage and dispersion under different leakage conditions and environmental conditions are calculated by using the simulation software.The influence of propane gas cloud concentration and cloud volume on explosion parameters in large space was analyzed,and the measures to prevent propane leakage difusion explosion were proposed.The range of propane explosion at standard temperature and pressure was measured by a 20 L near-spherical explosion test system,and the risk of propane gas explosion was 0.4369,which was less than that of methane and ethane.The explosion characteristics of propane with a concentration of 4%-10%were measured,and the curve of explosion pressure with concentration and time were analyzed.The results showed that when the concentration was 5%,the maximum explosion pressure of propane reached 0.649 MPa and the deflator index was 286.46 MPa·m·s-1.The influence of ignition energy on the maximum explosive pressure of propane was analyzed.When the maximum explosion pressure generated by ignition energy of 10 kJ was higher than the ignition energy of 1 J at the same concentration,the explosion pressure increased to 30.05%at a concentration of 4%.FLACS was used to simulate the 20 L near-spherical explosion test system.The average error with the experimental results was 5.29%.The reliability of the numerical simulation was verified within the acceptable range.The influence of leakage and wind speed on the propane dispersion process in large space was simulated.The more complex the geometric obstacles are,the slower the gas cloud dispersion is and the larger the maximum gas cloud volume is.Ambient wind speed can reduce the gas cloud aggregation effect and slow down the formation of gas clouds.The explosion intensity of gas cloud was related to the volume and concentration of gas cloud.With the increase in gas cloud volume,the maximum explosion pressure after the cloud was ignited,which presents a trend of first rising and then falling,and the maximum explosion pressure was around 4%.Compared with the small-scale propane explosion experiment,the small-scale propane gas explosion pressure is one order of magnitude higher.Inert medium protection,ventilation replacement and building pressure relief can reduce the accumulation of propane,reduce the possibility of propane leakage explosion accident,and weaken the damage of explosion shock wave to people and objects around.This study can provide an essential reference for monitoring and warning propane leakage and taking effective protective measures.