Hybrid CH4/coal dust explosions in a 20-L spherical vessel

Song, Shi-xiang; Cheng, Yi; Meng, Xiangrui; Ma, Honghao; Dai, He; Kan, Jie-tong; Shen, Zhaowu

doi:10.1016/j.psep.2018.12.023

Cited by 79 publications

(17 citation statements)

References 41 publications

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“…Song et al investigated CH 4 /coal hybrid explosions in a 20‐L apparatus and proposed that when the CH 4 concentration was lower than 10%, the P max value of the CH 4 /coal hybrid was higher than those of pure CH 4 and coal. However, when the CH 4 concentration was more than 10%, the P max of pure coal and the CH 4 /coal mixture was lower than that of pure CH 4 , which indicated that a high CH 4 concentration can compete with the oxygen in air, thereby weakening or mitigating dust explosions 25 . Yu et al investigated the explosion characteristics and residues in H 2 /aluminum (Al) hybrid explosions.…”

Section: Introductionmentioning

confidence: 99%

Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

et al. 2021

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The mechanisms involved in premixed magnesium and hydrogen hybrid and synthetic MgH2 dust cloud explosions were investigated. The results revealed that trace amounts of H2 in Mg explosions can markedly increase explosion severity. Furthermore, H2 addition can weaken the influence of oxygen deficiency on Mg explosion. Moreover, the explosion intensity of synthetic MgH2 was far stronger than that of premixed Mg/H2 mixture or Mg alone because the vacancy defects in Mg and H atoms can form after dehydrogenation of MgH2, which caused that Mg and H2 are prone to oxidation and nitrification in air atmosphere at a low temperature, thereby promoting the explosion. This demonstrates that the explosion risk of MgH2 (even other H2 storage materials) is related to its H2 storage capacity and dehydrogenation temperature. Therefore, for H2 storage materials, the better H2 storage performances can exhibit higher explosion risks.

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Section: Introductionmentioning

confidence: 99%

Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

et al. 2021

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“…Cuervo et al [22] found that for the two-phase mixed reaction of low-concentration gas and high-concentration dust, the presence of dust often limits the flame propagation speed. Song et al [23] used 20 L spherical explosion vessel to carry on the experimental study, it was found that with the increase of the concentration of coal dust or methane, the maximum explosion pressure and the maximum pressure rising rate increased at first and then decreased at the initial stage of the reaction. Ban et al [24] conducted a series of experimental studies and found that the initial ignition energy has a significant effect on coal dust explosion.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the characteristics of single-phase gas explosion and gas-coal dust coupling explosion in bifurcated tubes

Guo-xun

Guo

2021

Therm sci

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In order to deeply understand the overpressure propagation characteristics of explosion shock wave of single-phase gas explosion and gas-coal dust coupling explosion in bifurcated tube, this paper makes a comprehensive and in-depth study on the change and distribution law of explosion shock wave overpressure of single-phase gas explosion and gas-coal dust coupling explosion in bifurcated tube by means of experimental research, the results show that: The explosion shock wave overpressure of single-phase gas explosion and gas-coal dust coupling explosion is all affected by the bifurcation angle of the tube, the larger the bifurcation angle of the tube is, the greater the explosion shock wave overpressure is. In terms of explosion shock wave overpressure distribution, single-phase gas explosion and gas-coal dust coupling explosion show a similar overall development trend, and the maximum explosion shock wave overpressure is obtained in front of the bifurcation point. The mutation coefficients of explosion shock wave overpressure of single-phase gas explosion and gas-coal dust coupling explosion before and after the bifurcation point of the tube are all affected by the bifurcation angle of the tube. In the straight tube section, the mutation coefficient of explosion shock wave overpressure increases gradually with the increase of the bifurcation angle of the tube, while the situation in the inclined tube section is just the opposite. Under the condition of the same bifurcation angle, the shock wave overpressure mutation coefficient of gas-coal dust coupling explosion is smaller than that of single-phase gas explosion.

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“… 29 The explosion risk of hybrid CH 4 /coal dust is much higher than that of pure coal dust explosion. 30 Furthermore, coal mine gas is a multicomponent gas mixture, with methane being the dominant constituent. However, most reported studies treated the mine gas as pure methane without considering carbon monoxide, hydrocarbons, hydrogen, and other flammable gases; as a consequence, the results may significantly deviate from the reality in coal mines.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Impact of CO, C₂H₆, and H₂ on the Explosion Characteristics of CH₄

Chen

2020

ACS Omega

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Gas explosions are destructive disasters in coal mines. Coal mine gas is a multi-component gas mixture, with methane (CH 4 ) being the dominant constituent. Understanding the process and mechanism of mine gas explosions is of critical importance to the safety of mining operations. In this work, three flammable gases (CO, C 2 H 6 , and H 2 ) which are commonly present in coal mines were selected to explore how they affect a methane explosion. The explosion characteristics of the flammable gases were investigated in a 20 L spherical closed vessel. Experiments on binary- (CH 4 /CO, CH 4 /C 2 H 6 , and CH 4 /H 2 ) and multicomponent (CH 4 /CO/C 2 H 6 /H 2 ) mixtures indicated that the explosion of such mixtures is more dangerous and destructive than that of methane alone in air, as measured by the explosion pressure. Furthermore, a self-promoting microcirculation reaction network is proposed to help analyze the chemical reactions involved in the multicomponent (CH 4 /CO/C 2 H 6 /H 2 ) gas explosion. This work will contribute to a better understanding of the explosion mechanism of gas mixtures in coal mines and provide a useful reference for determining the safety limits in practice.

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Hybrid CH4/coal dust explosions in a 20-L spherical vessel

Cited by 79 publications

References 41 publications

Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

Investigation on the characteristics of single-phase gas explosion and gas-coal dust coupling explosion in bifurcated tubes

Experimental Investigation of the Impact of CO, C₂H₆, and H₂ on the Explosion Characteristics of CH₄

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Hybrid CH4/coal dust explosions in a 20-L spherical vessel

Cited by 79 publications

References 41 publications

Dust cloud explosion characteristics and mechanisms in MgH2‐based hydrogen storage materials

Dust cloud explosion characteristics and mechanisms in MgH2‐based hydrogen storage materials

Investigation on the characteristics of single-phase gas explosion and gas-coal dust coupling explosion in bifurcated tubes

Experimental Investigation of the Impact of CO, C2H6, and H2 on the Explosion Characteristics of CH4

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Product

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Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

Experimental Investigation of the Impact of CO, C₂H₆, and H₂ on the Explosion Characteristics of CH₄