Study on suppression effect of foam blocking device cavity additive

In order to improve the explosion suppression performance of foam blocks blasting device,the foam metal plates are filled with the powder suppressant to enhance foam sheet metal block blasting effect.The experiment is based on the gas-coal dust explosion system which is self-developed,and the best filling rate of 15 ppi,0.3 g/cm3,iron/nickel is 9∶1 foam iron nickel metal plate is the filling skeleton,and there are four suppressant powder as filling material which are ABC and BC powder.The optimal suppression and filling ratio of the foam metal plate is sought through the orthogonal experiment.The experiment results show that the foam metal plate filled with the suppressant has good suppression effect.The best filling rate of 15 ppi,0.3 g/cm3,iron∶nickel is 9∶1 foam metal plate is 35%.the filling body of the best explosion suppression effect is ABC∶BC=1∶1 mixture superfine powder,which can reduce the blast pressure from 0.342 MPa to 0.098 MPa,the rate of reduction is 71.3% and the flame speed reduce from 522 m/s to 114 m/s,the rate of reduction is 78.1%.The intensity of the explosion is significantly reduced.