Abstract
The suppressing effects of inert nanoparticles on methane–air explosion, in an obstructed chamber with internal dimensions of 150 mm × 150 mm × 500 mm, were experimentally investigated. To this end, the flame behaviors in the presence of obstacles as well as overpressure transients during the explosions with and without nanoparticles were compared. Additionally, the effects of density, diameter, and material of nanoparticles on the suppressing behaviors were analyzed as well. The results showed that the methane–air deflagrating flame remains generally light blue if the nanoparticles are added. In particular, the flame obstacle interaction may enhance the suppression effect of the nanoparticles, and the flame acceleration rate and the peak overpressure decrease significantly. Increasing explosion suppression is seen up to about 100 g m−3 particle density, but further increase in particle density, up to 150 g m−3, yields no further increase in the explosion suppression ability. And as the particle size decreases, the suppressing effect is more evident. The experiments also showed that Al(OH)3, Mg(OH)2, and SiO2 all can be used to suppress the flame propagation and overpressure. However, the metal hydroxides suppress the methane explosions even more efficiently than SiO2 particles; Al(OH)3 particles have a slightly better inhibiting effect than Mg(OH)2. Mechanisms for the observed phenomena were discussed.
Highlights
Gas explosion is one of the major disasters in coal mines, which always causes large losses and serious damage
We experimentally compared in detail ame behaviors as well as overpressure transients with and without nanoparticles, and explored the interaction between ame and inert nanoparticles during gas explosion suppression in an obstructed chamber, which aimed to reveal the effects of presence of obstacles
In order to further explore the in uence of nanoparticle material on suppressing behaviors against methane–air explosion, three different particle materials, i.e. Al(OH)[3], Mg(OH)[2], and SiO2, were used respectively, in which the given particle density (100 g mÀ3) and the averaged size (30 nm) were considered
Summary
Gas explosion is one of the major disasters in coal mines, which always causes large losses and serious damage. In the case of gas explosion, some inert ne particles sprayed over the ame pro le can absorb the explosion wave energy and extinguish ame propagation. Another interesting issue is the analysis of the physics of the interactions between explosion ame and particles, and between the ame and obstacles. We experimentally compared in detail ame behaviors as well as overpressure transients with and without nanoparticles, and explored the interaction between ame and inert nanoparticles during gas explosion suppression in an obstructed chamber, which aimed to reveal the effects of presence of obstacles. The effects of density, diameter, and material of nanoparticle on the suppressing behaviors for gas explosion were discussed
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