Experimental study on the flame law and inhibition of corn starch explosion

To prevent the occurrence of corn starch (cs) dust explosion accidents and reduce the losses caused by such accidents, this paper uses a flame propagation test system to study the inhibitory effects of ABC dry powder (sodium bicarbonate, sodium dihydrogen phosphate) and ammonium dihydrogen phosphate on the flame propagation of cs dust. The pyrolysis characteristics of cs and the inhibitions were analyzed using a thermogravimetric analyzer to reveal the mechanism of the inhibitions on cs dust. The research results show that the addition of the inhibitors can change the flame propagation behavior of cs dust. When the mass fraction of the inhibitors added is 10%, NH4H2PO4 reduces the flame propagation speed and distance of cs by 47.31% and 57.06% respectively, demonstrating a better explosion suppression effect. NaHCO 3 , NaH 2 PO 4 and NH 4 H 2 PO 4 all have physicochemical inhibitory effects in the process of suppressing the explosion of cs dust. The research results provide theoretical guidance for the prevention of cs dust explosion accidents.