Experiment and mechanism of explosion suppression thermal properties of multicomponent powder

Abstract

In this paper, staged thermal characteristic experiments were conducted on commonly used powder explosion suppressants using a high-precision C600 microcalorimeter. The thermal decomposition process was divided into three stages, and a comprehensive analysis was carried out on the thermal flow curves, dHF, initial heat flow value H₀, minimum heat flow value H_min, characteristic points, and heat absorption amount Q of twelve powder explosion suppressants, including attapulgite and montmorillonite. The results indicate that carbamide has the smallest minimum heat flow value H_min during powder thermal decomposition, while CaCO₃ has the largest minimum heat flow value H_min. Carbamide exhibited the highest overall heat absorption amount, while NaCl showed the lowest overall heat absorption amount. The mechanism of inhibiting methane explosion with different powder suppressors was analyzed by comparing the pyrolysis experiment results. The conclusions of this study can serve as a theoretical foundation for the rational selection of powder explosion suppressors, enhancing their utilization rate, and improving their explosion suppression effectiveness.