Experimental Study of the Effects of Coal Dust Particle Size on Laminar Burning Velocity in a Mixture of Coal Dust and Methan

Abstract

This study investigates the effect of variations of coal dust particles size on the rate of burning of coal dust particles in a 2-liter closed chamber. Coal dust was selected from three different mines with different sizes (149µm, 125µm, 105µm, 74µm, 63µm, 53µm, 44µm, 37µm) for explosion testing in a closed chamber of 2-liters. In this analysis, the concentration of coal dust was considered constant (10000 g/m 3), all tests were carried out at a pressure of 1.5 bar and the initial temperature was 25 °C. To calculate the burning rate, the explosion severity parameters of each sample, such as the maximum explosion pressure, the maximum rate of increase in pressure, and the explosion index must be determined during various tests. The results of the experiments show that by variating the size of the coal dust particles, the burning rate of the particles also changes and there is an inverse relationship between them. Coal dust particles with dimensions of 44µm and 37 µm have a higher burning velocity than other dimensions. Thus, with a reduction in the size of coal dust particles, the burning velocity of coal dust increases. The outcomes acquired in this examination are not just valuable in developing information on coal dust explosion processes, but also improve the measures needed to prevent coal dust explosions in coal mines.

Mechanism of Coal Aerosol Explosion Development in an Experimental Mine Working

“…The effect of the size of coal dust particles on their burning rate in a closed chamber was studied. From three different mines, coal dust with particle sizes of 149,125,105,74,63,53,44,37 μm was selected for explosion tests in a closed chamber with a volume of two litres (Moradi et al, 2019). All tests were carried out at a pressure of 1.5 bar and an initial temperature of 25°C.…”

Substantiation of Design Parameters of Coal Dust Explosion Containment System

“…The ability of dust of different coal strata to explode is evaluated using laboratory instruments, mainly, calorimeters. It is confirmed that as the particle size of coal dust decreases, its burning rate increases.Particles of coal dust with a size of 44 μm and 37 μm have a higher burning rate when compared to other sizes [2]. The analysis of laboratory experiments proved that dust with a fractional composition of 63…94 μm possesses the most explosive properties [3].…”