Experimental Studies On The Characteristic Of Magnesium And Aluminum Mixed Dust Explosion

The explosion of dust is a major accident that is harmful to people’s productionand living. At the same time, Mg-Al dust was widely used in industry, but it couldburn and explode easily, because of its active chemical properties. It is very necessaryto prevent effectively the hazard of explosion, to master the explosion principleaccurately, to understand the characteristics of the explosion, to establishcorresponding explosion test apparatus and to study the explosion characteristic.The explosion research of dust was reviewed. Explosion principle andcharacteristic of dust were discussed. Based on the principle and characteristics ofdust explosion, the factors which can affect the explosion parameters were analysed.Tested low explosive limit, minimum ignition temperature and minimum ignitionenergy based on the laboratory instrument.The main work and conclusions are as follows:(1) Based on the principle and characteristics of dust explosion, the factors whichcan affect the explosion parameters were analysed.(2)The magnesium and aluminum mixed dust of200mesh(75μm) of rates of1:1,1:2,1:3and their LEL were25g/m3,40g/m3,50g/m3respectively. As the proportionof aluminum increase in the mixted dust, LEL increases.(3) The magnesium and aluminum mixed dust of200mesh(75μm) of rates of1:1,1:2,1:3and their minimum ignition temperature were618℃、640℃、652℃respectively.As the proportion of aluminum increase in the mixted dust, minimumignition temperature increases.(4) The magnesium and aluminum mixed dust of200mesh(75μm) of rates of1:1,1:2,1:3and their minimum ignition temperature were251mJ,335mJ,348mJ respectively.As the proportion of aluminum increase in the mixted dust, minimumignition energy increases.