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.