Study on the Effect of Molecular Sieve Types on the Explosion Suppression Performance of Coal Dust during Transportation Process

<div class="section abstract"><div class="htmlview paragraph">The Chinese demand for coal necessitates the transportation over long distances, due to the disparity between its availability and the need. With the increase of coal demand, the scale of railroad transportation is also gradually expanding, which leads to the increasingly prominent problem of coal transportation safety. Especially in the transportation process, coal dust explosion has become an important safety hazard due to the accumulation of a large amount of coal dust in some specific Spaces. Therefore, the study of coal dust explosion suppression has become an urgent task at present. The solution to this problem is of great significance to ensure the safety of coal transportation. In this study, the explosion suppression of coal dust by four types of molecular sieves was experimentally analyzed using the Hartmann flame propagation test equipment, and the results showed that mesoporous molecular sieves were far superior to microporous molecular sieves in suppressing explosions. The experimental data show that the explosion suppression efficacy of both mesoporous molecular sieves, MCM-41 and SBA-15, exceeds that of 13X and Hβ microporous molecular sieves. Especially MCM-41, owing to the high efficiency of its pore structure and large specific surface area, shows the best explosion inhibition performance among all molecular sieves. At the same time, with the increase of molecular sieve addition, velocity of propagation of flame of coal dust deflagration is reduced, the flame brightness is blackened, and the flame travels a shorter distance, so that the coal dust explosion can be effectively suppressed.</div></div>