Experimental data revealing explosion characteristics of methane, air, and coal mixtures

Deng, Jun; Qu, Jiao; Wang, Qiuhong; Cheng, Yu-Chi; Shu, Chi‐Min

doi:10.1039/c9ra04416g

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…The above findings showed that the coupling of fine water mist containing 7% KCl and 20% CO 2 had a better suppression effect on the temperature of the explosion flame wave. 35,36 The qualitative conclusions obtained in this study are consistent with the relevant descriptions in refs11 39,and42. It demonstrates that the conclusions obtained in this paper can describe the effective method of suppressing methane explosion in the pipeline network and can also provide theoretical reference and support for suppressing the methane explosion event in the actual mine roadway network.…”

Section: Explosion Suppression Effect Of Coupling Water Mist With An ...supporting

confidence: 91%

“…Under the working conditions of fine water mist containing 7% KCl and 20% CO 2 , the peak flame temperatures in branch pipes 1 to 5 decreased by 82.4, 82.3, 82.2, 82.3, and 82.2%, respectively, compared to without explosion suppression measures. The above findings showed that the coupling of fine water mist containing 7% KCl and 20% CO 2 had a better suppression effect on the temperature of the explosion flame wave. , …”

Section: Resultsmentioning

confidence: 71%

“…The above findings showed that the coupling of fine water mist containing 7% KCl and 20% CO 2 had a better suppression effect on the temperature of the explosion flame wave. 35 , 36 …”

Section: Resultsmentioning

confidence: 99%

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Study on Methane Explosion Suppression in Diagonal Pipe Networks Using a Fine Water Mist Containing KCl and an Inert Gas

2022

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To explore an effective approach for suppressing methane explosions in actual pipe networks, we used a custom-made diagonal pipe network experimental system to assess the suppression of methane explosions using a fine water mist containing KCl and an inert gas. The shock wave pressure, flame wave velocity, and flame wave temperature under different suppression conditions were compared to characterize the effects of explosion suppression under different working conditions, and the mechanism of explosion suppression was analyzed. The results showed that under single-factor explosion suppression conditions the optimal explosion suppression results were achieved when the volume fraction of N 2 was 25%, the volume fraction of CO 2 was 20%, and the concentration of KCl was 7%. The suppression effect of CO 2 on the flame wave temperature was better than fine water mist containing KCl and N 2 , and the suppression effect of fine water mist containing KCl on the shock wave overpressure and flame wave velocity was more significant. Under the working conditions of fine water mist containing KCl, which was coupled with an inert gas to suppress the explosion, the suppression effect of the fine water mist containing KCl coupled with 20% CO 2 on the shock wave overpressure, flame wave velocity, and flame wave temperature was considerably better than fine water mist containing KCl coupled with 25% N 2 .

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Section: Explosion Suppression Effect Of Coupling Water Mist With An ...supporting

confidence: 91%

Section: Resultsmentioning

confidence: 71%

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Study on Methane Explosion Suppression in Diagonal Pipe Networks Using a Fine Water Mist Containing KCl and an Inert Gas

2022

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“…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. They found that when 500 g/m 3 coal dust and methane explode, the maximum explosion pressure is linearly related to methane concentration and volatile content of coal dust, decreased with an increase in methane concentration, and increased with volatile content of coal dust.…”

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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“…Coal is an important energy source and chemical raw materials [1][2][3][4]. Many disasters may occur in the process of coal mining [5][6][7][8][9][10][11]. As one of the main disasters, coal spontaneous combustion (CSC) not only burns vast coal resources and releases toxic gases but also causes casualties [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

Zhang

Wang

2020

Energies

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Inert gases can effectively inhibit coal spontaneous combustion. In this paper, the inhibition effect of inert gases (N2 and CO2) on coal spontaneous combustion was studied. In the low-temperature oxidation stage, the constant-temperature heat release and apparent activation energy of coal sample were measured and calculated by the C80 micro-calorimeter. In the high-temperature combustion stage, the critical temperature, maximum peak temperature, ignition temperature, and burn-out temperature of coal samples were analyzed by the synchronous thermal analyzer. The results demonstrate that with the decrease of O2 concentration, the oxidation heat release of coal samples drops gradually while the apparent activation energy increases gradually. In the N2 and CO2 atmospheres, as the O2 concentration is reduced to 1.5% and 3%, respectively, the value of apparent activation energy changes from negative to positive, and the spontaneous reaction transits to a nonspontaneous reaction. The TG-DTG (thermogravimetric-derivative thermogravimetric) curve of coal sample in the high-temperature combustion stage indicates that the critical temperature exhibits a W-shaped trend with the decrease of O2 concentration, which also leads to gradual increases of maximum peak temperature, ignition temperature, and burn-out temperature. The above results signify that increasing the inert gas concentration can gradually reduce the oxidation and combustion rate and improve the inhibition effect on coal spontaneous combustion. In addition, when the O2 concentration is the same, the inhibition effect of CO2 on coal spontaneous combustion is superior to that of N2.

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Experimental data revealing explosion characteristics of methane, air, and coal mixtures

Abstract: The explosion characteristics of methane–air–coal dust mixtures were investigated using an XKWB-1 sealed explosion system.

Cited by 9 publications

References 38 publications

Study on Methane Explosion Suppression in Diagonal Pipe Networks Using a Fine Water Mist Containing KCl and an Inert Gas

Study on Methane Explosion Suppression in Diagonal Pipe Networks Using a Fine Water Mist Containing KCl and an Inert Gas

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

Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

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