Experimental and Simulation Study on the Explosion of a Coal/Methane Mixed System

This study investigates
the microscale suppression mechanisms
of
four powder explosion suppressants on coal dust/methane (CH4) mixed system explosions. Combining experimental and numerical simulation
methods, we explore the gas-phase reaction processes and the role
of free radicals in the explosion suppression. Results show that all
suppressants reduce the maximum explosion pressure and pressure rise
rate, with MPP being the most effective, reducing pressure by 38%.
Suppressants inhibit explosions through physical (heat absorption)
and chemical (free-radical consumption) mechanisms. Phosphorus-containing
intermediates from NH4H2PO4 and MPP
react with free radicals, while NaHCO3 and MCA decompose
to produce inert gases and consume O• and H• radicals.
This work provides a theoretical foundation for optimizing explosion
suppressants in mining safety applications.