Influence of acetylene on methane–air explosion characteristics in a confined chamber

Jia, Jinzhang; Zhu, Jinchao; Niu, Wenxing; Zhang, Jing

doi:10.1038/s41598-021-93466-4

Cited by 5 publications

(3 citation statements)

References 54 publications

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“…Coal dust explosion belongs to the combustion process of multiphase flow, and the duration of the explosion is very short, making the explosion process difficult to capture. Scholars can obtain the intensity characteristics of gas and coal dust explosions through continuous experiments and have achieved certain results 20 – 26 . Numerical simulation technology has also been developed to explore the characteristics and propagation process of coal dust explosions.…”

Section: Introductionmentioning

confidence: 99%

Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

Liu,

Liu

2024

Sci Rep

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To discuss the inhibitory effect of micrometer scale coal dust explosion pressure, three types of explosion suppressants are selected for mixed explosion suppression. The results indicate that the coal dust explosion process includes three stages: accelerated and decelerated energy release, as well as energy dissipation. When using explosive suppressants, K2CO3 has the greatest inhibitory effect on coal dust explosion, followed by KCl, and CaCO3 has the smallest effect. The K2O, K2O2, and KOH generated by the thermal decomposition of K2CO3 can also block the heat transfer of coal dust, playing a good role in suppressing explosions. The explosion suppression effect of mixing CaCO3 and K2CO3 is better than that of mixing CaCO3 and KCl, and is worse than the explosion suppression effect of using K2CO3 alone. The synergistic effect of KCl and K2CO3 mixed explosion suppression makes the suppression effect better than using K2CO3 alone. This is because KCl generates K2O during pyrolysis, promoting the dynamic equilibrium of K2CO3 explosion suppression process. This makes mixed explosion suppression more worthy of attention and adoption when considering purchase costs.

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Section: Introductionmentioning

confidence: 99%

Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

Liu,

Liu

2024

Sci Rep

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“…Methane gas explosions are a major hazard in coal mines, leading to significant consequences, including economic losses for coal enterprises, human casualties, environmental damage, and severely hindering the coal industry's production 1 , 2 . Gas explosions release an immense amount of energy instantaneously, resulting in a high-temperature environment.…”

Section: Introductionmentioning

confidence: 99%

Influence of initial gas concentration on methane–air mixtures explosion characteristics and implications for safety management

Jia,

Si,

Wang

et al. 2023

Sci Rep

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Gas explosions, particularly those involving methane–air mixtures, present considerable hazards in confined spaces, such as coal mines. Comprehending the explosion characteristics and their correlations with initial gas concentrations is vital for devising effective safety measures. This study examines the influence of initial gas concentration on explosion temperature, overpressure, and flame evolution in methane–air premixed gas explosions, utilizing a custom-built 20-L spherical explosion experimental apparatus. The explosion temperatures display an oscillatory pattern, reaching maximum values at 6.5%, 9.5%, and 12% initial gas concentrations, with corresponding temperatures of 995 K, 932 K, and 1153 K. The maximum overpressure exhibits an initial rise and fall trend, modeled by an exponential function. Notably, in proximity to the 9.5% concentration, the pressure wave fosters the reverse propagation of the flame wave, leading to a secondary temperature increase. Flame sensors were employed to investigate the presence, absence, and duration of flames, demonstrating that elevated initial gas concentrations resulted in more prolonged flame durations and increased harm. At an initial gas concentration of 9.5%, a persistent flame is generated instantaneously during the explosion. Furthermore, the study analyzes the interplay between temperature and overpressure, underscoring the significance of mitigating high-temperature burns near tunnel walls and enclosed spaces. These findings advance the understanding of gas explosion dynamics and hold substantial implications for safety measures in coal mines.

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“…The threat from gases, such as methane, acetylene, and coal dust, in the form of their increased concentrations in the air can be efficiently monitored by using specialized instruments [2][3][4]. As a result, accidents related to gas explosions are reported to be decreasing [5][6][7][8]. Seismic tremors occur when the accumulated energy of generated stresses finds an outlet in the form of rock mass destruction.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Maniak

Mydlikowski

2022

Sensors

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This paper analyses the function of an innovative integrated receiver for the measurement of electromagnetic field emissions. The autonomous receiver measures and registers the elevated emission levels of both components of the EM field originating from rocks subjected to increased mechanical stress. The receiver’s sensitivity of 60 µV/m, its dynamic range of 98 dB, and its impulse response of 0.23 V/µs were determined in laboratory conditions. Real EM field signals from hard coal samples subjected to crushing force were recorded using an autonomous receiver. The observed and recorded results confirm that the receiver operates in the full range of amplitudes of the EM field signal emitted from the rock. The results determine the band of characteristic signals for EM field emission from hard coal. The system created on the basis of autonomous EM receivers can support the existing seismic safety systems in real mine conditions by predicting the possibility of mine collapse hazards.

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Influence of acetylene on methane–air explosion characteristics in a confined chamber

Cited by 5 publications

References 54 publications

Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

Influence of initial gas concentration on methane–air mixtures explosion characteristics and implications for safety management

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

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