Suppression effect and mechanism of fly ash on gas explosions

The research is aimed at promoting the suppression of gas explosion accidents. Gas explosion suppression experiments were performed in a 20 L spherical test apparatus with fly ash (FA) and modified fly ash (MFA) as explosion suppressants, and the effect of residual carbon in FA on the gas explosion was explored. The experimental results show that both FA and MFA have a good suppression effect on gas explosions. Under the same conditions, the explosion suppression effect of FA is superior to those of MFA and CaCO 3 . In addition, the thermal characteristics of FA and MFA were investigated by means of simultaneous thermal analysis. Based on the difference in the composition of FA before and after the explosion, it is found that residual carbon will participate in the explosion reaction, and residual carbon can enhance the explosion suppression effect. The explosion suppression efficiency of FA is at most 4.05 % higher than that of MFA under the same conditions. Finally, the explosion suppression mechanism of FA was expounded. • The inhibitory effect of fly ash on gas explosion was studied. • Fly ash have a better inhibitory effect than rock dust (CaCO 3 ). • The explosion suppression mechanism of fly ash is analyzed. • The promoting effect of residual carbon on explosion suppression was found.