Influences of coal dust components on the explosibility of hybrid mixtures of methane and coal dust

Wang, Yan; Qi, Yingquan; Gan, Xiangyang; Pei, Bei; Wen, Xiaoping; Ji, Wentao

doi:10.1016/j.jlp.2020.104222

Cited by 37 publications

(13 citation statements)

References 17 publications

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“…In the process of coal dust explosion, high-temperature flame and high-speed propagating pressure shock wave will be generated. The propagation speed of the pressure shock wave is much greater than the propagation speed of the flame; theoretical research shows that the flame propagation speed of the coal dust explosion can reach more than 1120 m/s and the propagation speed of the pressure shock wave can reach more than 2340 m/s, both of which are extremely destructive. , At the same time, the average theoretical pressure of the coal dust explosion in coal mine tunnels is 736 kPa, and the explosion pressure increases rapidly with the increase of the distance from the explosion source. , Nowadays, with the development of dust explosion test methods, it is of great significance for coal mine safety production to master the variation law of coal dust explosion pressure characteristics and the suppression effect of different types of inert dust on coal dust explosion. , …”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

et al. 2022

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Coal is an important strategic resource in the world; coal production safety has always been widely concerned. In coal mine production, inert dust can effectively reduce coal dust explosion accidents in mine tunnels. To reveal the suppression effect of inert dust on lignite dust explosion, CaCO 3 , SiO 2 , and NH 4 H 2 PO 4 are selected for suppression experiments. It is found that the lignite dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into lignite dust increase. By calculating the molar mass, the suppression effects of CaCO 3 and SiO 2 on lignite dust explosion are compared. The lignite dust no longer explodes when the mass percentage of NH 4 H 2 PO 4 dust mixed into lignite dust is 70%, indicating that NH 4 H 2 PO 4 is more effective than that of CaCO 3 and SiO 2 . The smaller the particle size of NH 4 H 2 PO 4 , the better the suppression effect on explosion. The lignite dust does not explode when the mass percentage of NH 4 H 2 PO 4 is 60% and the particle size of NH 4 H 2 PO 4 is 25–38 μm, which proves that decreasing the particle size of NH 4 H 2 PO 4 is important to suppress explosion. The research results are of great significance for grasping the explosion suppression effect of inert dust on lignite dust.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

et al. 2022

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“…The results demonstrate that the addition of methane to various types of coal dust clearly increases the maximum explosion pressure and explosion index, while reducing the minimum explosive concentration. The effect of methane on the force of the explosion is more pro-nounced for coal dust with a low volatile content, and on the sensitivity to ignition -for coal dust with a higher volatile content (Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of development of coal dust continuous explosion in a network of mine workings

Kostenko

Zavialova

Pozdieiev

et al. 2022

MGPB

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The objective of this paper is to reveal the mechanism of creating conditions for the continuous explosion of coal dust by transferring seismic energy to coal dust located along the perimeter of a working. The ANSYS software package was used to model the movement of coal dust particles in the air under the influence of seismic waves caused by the action of an explosion. It was confirmed by modelling that seismic waves, provoked by an explosion, propagate in the rock mass at a higher velocity than the moving explosive front in the air of a working. The qualitative and quantitative behaviour of a layer of coal dust in the process of oscillation of the working walls under the influence of seismic waves during one second was described. The stage of dynamic loosening of the powder is supplemented by the initial period of the mechanism of explosion development, when there are no combustible concentrations of gas or coal traces in the air composition of the mine working before the incident. It is established that under the seismic influence at a distance of about 50 m from the hypocentre of the explosion, a layer of powder-like dispersed coal rises into the air forming a dust cloud, which is the initiator of further continuous development of the explosion spreading in a network of mine workings.

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“…Related research has found that the pressure of coal dust explosion in mine tunnels is more than 0.7 MPa. If there is an obstacle in the tunnels, the explosion pressure will increase rapidly near the obstacle, so that the pressure in the coal dust explosion accidents is much higher than the theoretical value [4,5]. Nowadays, the testing technology and control method of coal dust explosion have been developed continuously, the use of inert dust to suppress coal dust explosion has gradually become an economical, environmentally friendly and effective safety measure [6,7].…”

Section: Introductionmentioning

confidence: 99%

Research on suppression effect of different types of inert dust on coking coal dust explosion pressure in a confined space

Liu

2022

Preprint

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To study the suppression effect of inert dust on coking coal dust explosion pressure, NaCl, KCl and NH4H2PO4 are selected for explosion suppression. It is found that as dust cloud mass concentration increases in the range of 300~500 g/m3, both Pmax and (dP/dt)max increase first and then decrease. The coal dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into coal dust increase from 0% to 70%. The explosion no longer occurs when the mass percentage of NH4H2PO4 mixed into coal dust is 70%, indicating that NH4H2PO4 is more effective than that of NaCl and KCl. The smaller the particle size of inert dust NH4H2PO4, the more obvious the suppression effect on dust explosion. The coal dust no longer explodes when the mass percentage of NH4H2PO4 mixed into coal dust is 60% and the particle size of NH4H2PO4 is 25~38 μm, which proves that decreasing the particle size of NH4H2PO4 is important for suppressing explosion.

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Influences of coal dust components on the explosibility of hybrid mixtures of methane and coal dust

Cited by 37 publications

References 17 publications

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Mechanism of development of coal dust continuous explosion in a network of mine workings

Research on suppression effect of different types of inert dust on coking coal dust explosion pressure in a confined space

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