Study on gas explosion suppression influence of thermal properties of powder

The thermogravimetric experiments were analyzed on different materials.The decompositions of Al(OH)3,Mg(OH)2 and urea were studied.The characteristics of suppression material decomposition were studied by analyzing TG and DSC curves.It shows that the initial pyrolysis temperature of urea(133.0 ℃) is lower than that of Al(OH)3 and Mg(OH)2 and its heat absorption(1 291 J/g) is larger than that of Al(OH)3 and Mg(OH)2.The three materials' mechanisms of gas explosion suppression were analyzed and compared.The results show that the performance of urea is better than the other two materials,because its decomposition occurs faster and has greater heat absorption,and there are free radicals produced in this process.Also the result are confirmed by gas explosion experiments.