Abstract: The purpose of this study was to obtain a new type of powder explosion suppressant, and a new type of composite porous powder explosion suppressant was prepared by a series of modification processes. The explosion suppression effect of methane before and after powder modification was discussed by carrying out methane inhibition experiments in a self-built small-sized pipeline. The explosion suppression effect was analyzed by the maximum explosion overpressure, flame propagation rate and flame propagation pattern. The experimental results show that the explosion suppression performance of modified waste incineration fly ash (MFA) is improved compared with that of unmodified waste incineration fly ash (FA), and the maximum explosion pressure of 9.5% methane is reduced by 30.55% and the peak velocity of 9.5% methane is reduced by 40.24% by 0.12 g/L MFA. At the same time, it was found that MFA had higher mass loss and lower pyrolysis temperature compared with FA, and had both physical and chemical inhibition effects.

Key words: methane explosion suppression, modified waste incineration fly ash, flame propagation, physicochemical synergistic mechanism