Study Of Thermal Decomposition Mechanism Of Mixture Of Emulsion Explosive With Organic Solvent

Recent years, several malignant accidents that brought about fearful loss of property and personnel took place successively in the course of producing, transporting, depositing, using and burning down the emulsion explosive, and people slowly have cognizance of emulsion explosive bearing considerable fatalness and begin making a point of researching its fatalness.In this research, thermal chemical reaction kinetics of the mixture of emulsion explosive matrix with petroleum ether, gasoline or diesel oil is testing by improved iron-plate testing technology and TG-DSC coupling technique, in order to research the explosion probability of the mixture of emulsion explosive with combustible oil solvent when it is burning down. The research results indicate:(1)The combustion of emulsion explosive matrix is a course of emulsion being destroyed, oil phase and water phase disjoining, water component vaporizing, organic matter carbonizing, then the system firing till reactant being consuming. The combustion of emulsion explosive matrix is nearly relational with the temperature of the environment, the delayed-action time will extend when the non-adiabatic semenov parameter is around the critical value. Once the temperature of the environment exceeds the critical explosion temperature, the delayed-action time will shorten along with the temperature of the environment ascending;(2) The thermal decomposition reactivity activation energy and correlative parameters of the emulsion explosive matrix and corresponding mixture of emulison explosive with combustible oil solvent were obtained by iron-plate experiment, thereinto, the activation energy of the emulsion explosive matrix is 163.3kJ/mol. The activation energy, pre-exponential factor and decomposition reactivity mechanism function of the emulsion explosive matrix and corresponding mixture of emulison explosive with combustible oil solvent were obtained by TG-DSC experiment, thereinto, the activation energy of the emulsion explosive matrix is 94.42kJ/mol, smaller than which obtained by iron-plate experiment due to the difference of the testing systems.(3) The decomposition reactivity course of the emulsion explosive matrix and corresponding mixture of emulison explosive with combustible oil solvent is dominated by the diffuseness mechanism.(4)The mixture of emulsion explosive matrix with combustible oil solvent is easier to decomposes than pure emulsion explosive when being heated or being fired, in other words, its explosion probability is bigger, that should be paid attention in the course of producing, transporting, depositing, using and burning down the emulsion explosive.