Experimental Studies On The Characteristics Of Dust Explosion In Closed Rooms And Relief Calculation

The characteristics of dust explosion of aluminum dust, RDX dust and their mixtures were studied experimentally by using a 1.3 liter Hartmanm duct in this paper. And the general calculation methods to calculate the relief area of dust explosion in closed vessels and buildings were concluded and summarized, and a visible application: Relief Calculation System of Dust Explosion, was developed by using VB. The main work and conclusions are as follows:(1) An experimental system consisting of raising, control, ignition, testing and data acquisition system was set up. Some characteristic parameters, the maximum explosion pressure and maximum rate of pressure rise etc, can be tested by using this experiment system.(2) The characteristics of dust explosion of aluminum dust and RDX dust were studied experimentally by using this experimental system. Experiment results demonstrate that the characteristics of dust explosion of energetic materials(RDX) are very different from that of combustible dusts in general (aluminum dust). For combustible dusts in general, the effects of ignition delay on the maximum explosion pressure and maximum rate of pressure rise are very noticeable; And decreased particle size leads to increase the maximum explosion pressure and maximum rate of pressure rise, and the trends are obvious; And exists a optimum concentration that makes the maximum explosion pressure and maximum rate of pressure rise reach a maximum. But for energetic materials, the concentration of oxygen in air is not an essential condition for it; And the effects of ignition delay on the maximum explosion pressure and maximum rate of pressure rise are not noticeable within certain limits; And the effects of particle size on the maximum explosion pressure is not marked, and with an increase in the particle size, the maximum rate of pressure rise decrease more smoothly when compared with that of combustible dusts in general; And the maximum explosion pressure and maximum rate of pressure rise vary approximately linearly with the concentration.(3) The characteristics of mixed dust of aluminum and RDX dusts were studied experimentally. From the relations of its maximum explosion pressure and maximum rate of pressure rise and the ratios of mixtures, we can conclude that existing a synergistic effect on aluminum dust and RDX dust with proper ratios in their mixtures.(4) A visible application: Relief Calculation System of Dust Explosion, was developed by using VB. And the relief area of dust explosion in closed vessels and buildings can be calculatedrapidly and exactly by using this application.The new ideas presented in this paper are as follows:Firstly, the synergistic effects on aluminum dust and RDX dust in their mixtures were studied experimentally, and the ratios of the two dusts in their mixtures, when the synergistic effects produced, were gained.Secondly, abacs of dust explosion are read by program. So some errors produced by hand when reading abacs can be avoided, and the veracity is enhanced.