A Study On The Explosion Characteristics And Suppression Experiment Of93#Gasoline Vapor

The explosion of combustible gas and liquid vapor is one of the most common forms ofexplosion hazard. The suppression technology to combustible gas has a large number ofresearches. But the explosion hazard of combustible liquid vapor is often ignored because ofthe special physical properties. Gasoline is one of the most common combustible liquids inhuman production and life. It has a high combustion and explosion hazard. Therefore,exploring the gasoline vapor explosion suppression technology has a very important practicalsignificance.No.93gasoline was taken as the research object, and four dry powders were chosen toassess the suppression effect of gasoline vapor explosion, which the main components aresodium salt, ammonium phosphate, superfine ammonium phosphate and superfine APP salt.A complete set of explosion suppression device to combustible gases (liquid vapor) wasset up on the basis of the original220L explosion cans. The most violent explosionconcentration, lower explosive limit and minimum ignition energy in different temperatures ofgasoline vapor was tested in the early experiments. In the explosion suppression experiments,the dry powder was sprayed during deflagration to detonation of gasoline vapor by time relayadjusting the gasoline vapor ignition time. The changes of peak pressure, rate of pressure riseand energy of gasoline vapor were compared before and after explosion suppression.The experimental results show that: the most violent explosion concentration of gasolinevapor is2.9%(V/V), and the maximum explosion pressure around the0.996MPa. Lowerexplosive limit and minimum ignition energy of gasoline vapor is decreasing with the gastemperature increasing. Different dry powder has the different optimal ignition delay time,and the smaller particle size powder requires the longer ignition delay time. The dry powderin different component and particle size has the different optimal mass concentration of explosion suppression. The optimal mass concentration of explosion suppression of the fourpowders are0.455g/L of sodium salt,0.228g/L of ammonium phosphate,0.682g/L ofsuperfine ammonium phosphate and0.227g/L of superfine APP salt. Appropriately reducing theparticle size can improve gas explosion suppression effect. The suppression effect of four dry powdersto gasoline vapor explosion from high to low in the order is superfine ammonium phosphate>ammonium phosphate> sodium salt> superfine APP salt.The explosion suppression technology for gasoline vapor is summarized and prospectedin the last, and the conclusion has a certain guiding significance to prevent the oil and gasexplosion.