Minimum explosion concentration of coal dusts in air with small amount of CH4/H2/CO under 10-kJ ignition energy conditions

Zhao, Peng; Tan, Xin; Schmidt, Martin; Wei, Aizhu; Huang, Weixing; Qian, Xinming; Wu, Dejian

doi:10.1016/j.fuel.2019.116401

Cited by 54 publications

(8 citation statements)

References 31 publications

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“…Song et al [7] studied influential factors of hybrid CH 4 /coal dust explosions by using 20 l spherical explosion vessel and indicated that the maximum explosion pressure concentrations of coal dust and CH4 are 200 g/m 3 and 5 vol.% in the atmospheric pressure. Researchers discovered that the explosion of hybrid mixtures occurs when both dust and gas concentrations are lower than the minimum explosion concentration of the single substances [8][9][10]. Deng et al [11] conducted methane-air-coal dust explosion in an XKWB-1 sealed explosion system.…”

Section: Introductionmentioning

confidence: 99%

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

Guo-xun

Peng

2022

THERM SCI

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A methane and coal dust explosion system was constructed to investigate the propagation of pressure and CO gas after methane and coal dust coupling explosion. The influence of coal dust concentration on the propagation of pressure and CO gas were analyzed by coupling explosion experiments of 5% methane with coal dust (0, 100 g/m3, 200 g/m3, 300 g/m3, 400 g/m3and 500 g/m3), 7% methane with coal dust(0, 50 g/m3, 100 g/m3, 150 g/m3and 200 g/m3), and 9% methane with coal dust (0, 50 g/m3, 100 g/m3, 150 g/m3and 200 g/m3). The experimental results show that when 5% or 7% methane explodes with coal dust in the explosion chamber, the pressure first increases and then decreases with the increase of coal dust concentration. When the methane concentration is 9%, the pressure decreases with the increase of coal dust concentration. In the propagation pipe, the explosion pressure and CO gas concentration decrease with the increase of distance. When the methane concentration and distance are constant, the higher the coal dust concentration is, the higher the pressure and CO gas concentration is.

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Section: Introductionmentioning

confidence: 99%

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

Guo-xun

Peng

2022

THERM SCI

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“…A coal dust explosion is a major hidden danger in the process of coal mining [1]. The low explosion limit (LEL) of combustible dust is the main parameter to characterize the combustible and explosive risk of the dust [2][3][4]. Chawla et al [5] conducted a dust explosion experiment with a 20 L spherical airtight container, and measured the effect of the ignition energy on the LEL of the coal dust from different producing areas.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of the coal dust explosion: Main factors and optimal control

et al. 2022

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The explosion intensity and the low explosion limit of the coal dust explosion are affected by the calorific value and the heat transfer rate of the coal dust, which are closely related to the coal quality index. This paper studies experimentally the low explosive limit of the coal dust with different coal quality indexes. Based on the principal component analysis, the main factors affecting the low explosive limit are obtained by extracting the principal components from the coal quality indexes. Through comparative analysis, a regression model is proposed to predict the low explosive limit for practical applications.

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“…The wider the explosion limit range, the more mature the mechanism of flame-induced gas explosion [ 34 ]. Researchers [ 35 , 36 ] have focused on the ignition method, ignition energy point explosion gas theory, and experimental research and have provided some theoretical and technical support for gas explosion shock waves and flame front coupling point explosions of local gas in the excavation roadway.…”

Section: Introductionmentioning

confidence: 99%

Propagation laws of discontinuous gas supply in the excavation roadway

Gao

Shi

et al. 2022

PLoS ONE

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An explosion with a discontinuous gas supply (DGS-explosion) is more complicated than a common secondary explosion. We present the results of a study on the propagation laws of the DGS-explosion induced by a gas explosion in excavation roadways. A rectangular tube was established using ANSYS, similar to an excavation roadway in an underground coal mine. The gas, flame, and shock wave propagation laws were determined by analyzing the explosive gas as it exited the excavation roadway. The results show that the initial explosion caused the flame generated in the DGS-explosion to be significantly stretched. Moreover, the shock wave was reflected by the end of the tube, which resulted in the reverse migration of the local gas after the DGS-explosion. Meanwhile, with the increase in local gas concentrations, the pressure peak and the entire explosion system can increase after the DGS-explosion. The flame region, temperature peak, and flame irregularity in the tube positively correlate with the concentration. These results can provide theoretical support and an experimental basis for preventing and responding to accidents caused by gas explosion accidents.

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Minimum explosion concentration of coal dusts in air with small amount of CH4/H2/CO under 10-kJ ignition energy conditions

Cited by 54 publications

References 31 publications

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

Thermodynamics of the coal dust explosion: Main factors and optimal control

Propagation laws of discontinuous gas supply in the excavation roadway

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