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/m3), all tests were carried out at a pressure of 1.5 bar and the initial tem- perature was 25 °C. To calculate the burning rate, the explosion severity parameters of each sample, such as the maxi- mum 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.
Highlights
Nowadays with advances in technology and the increasing application of powder in various industries, dust explosion is one of the most substantial hazards in the production industry. (Chao and Dorofeev, 2015)
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
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
Summary
Nowadays with advances in technology and the increasing application of powder in various industries, dust explosion is one of the most substantial hazards in the production industry. (Chao and Dorofeev, 2015). When gas and dust are dispersed simultaneously in the air, a complex physical-chemical process occurs that causes severe risk and damage (Kundu et al, 2017). One of the most significant and sensitive industries that is susceptible to gas and dust explosions is underground coal mines, where methane and coal dust coexist (Kundu et al, 2017). (Xie et al, 2012) According to this figure, the primary methane explosion disperses coal dust particles from the floor and clouds of coal dust are formed. In order to assess and prevent the explosion of coal dust, explosive parameters have been investigated as the basis for assessing the explosion risk and mainly include maximum explosion pressure (Pmax), maximum pressure increase rate (dp/dt)max, explosion index (KST) and burning velocity (SL) (Li et al, 2018)
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