Experimental investigation on suppression of methane explosion using KHCO3/zeolite composite powder

An efficient KHCO 3 /zeolite composite powder was prepared mechanochemically for methane explosions suppression. The suppression performance of the composite powder was investigated using a 20 L spherical explosion system. The suppression mechanism was elucidated by the analysis of pyrolysis characteristics, explosion products, and KHCO 3 suppression kinetic model . Results indicate that the composite powder significantly improved dispersion and exhibited suppression performance better than KHCO 3 . The addition of 0.1 g/L of the composite powder with 45 wt% KHCO 3 loading had excellent inhibition effect in different concentrations explosion, and for 7 vol% methane explosion, it performed the best inhibition effect, where the maximum explosion pressure ( P max ) and maximum explosion pressure rise rate ((d P /d t ) max ) were reduced by 85.76% and 94.59%, respectively. The suppression effects of KHCO 3 /zeolite composite powder involved the endothermic and barrier effects, adsorbing free radicals and consuming of H and OH radicals by Na + and KHCO 3 decomposition products.