Study on mechanism and dynamics of inert powder explosion inhibitor inhibiting aluminum powder explosion

Abstract

• The suppression of aluminum powder explosion by inert powder is compared for the first time. • The comparative study shows the advantages of synergistic inhibition of MPP powder. • The modal free function method is used to calculate and verify the dynamic model for the first time. • The inhibition mechanism of MPP explosion inhibitor on aluminum powder explosion is revealed. In order to study the suppression performance and action mechanism of inert powder on aluminum powder explosion flame, using the dust explosion flame propagation test system, five kinds of common inert powder and two kinds of aluminum dust with different particle sizes were selected for explosion flame suppression and overpressure suppression experiments. Combined with the thermal characteristic curve of inert powder, the inhibition performance and action mechanism of inert powder on aluminum powder explosion were systematically studied. The results show that the inhibition effect of MPP dry powder on aluminum dust is better than that of NaHCO 3 , CaCO 3 , Al(OH) 3 and NH 4 H 2 PO 4 ; The inhibition mechanism model of inert powder on aluminum powder explosion flame is established, and the action mechanism is analyzed. The oxidation process of aluminum dust with and without MPP dry powder was analyzed by Coats Redfern (C-R) method, and the activation energy and kinetic models of different stages were obtained. The results were verified by Flynn Wall Ozawa (FWO) and Kissinger Akahira Sunose (KAS) methods. The research results can provide a theoretical basis and basis for the explosion suppression design of aluminum dust and the development of explosion suppression powder.