Influence of the Cavity Structure in the Excavation Roadway on the Gas Explosion Characteristics

Li, Shengnan; Gao, Ke; Liu, Yujiao; Ma, Mingrui; Huo, Chongyang; Cong, Mingzhi; Li, Yixin

doi:10.1021/acsomega.1c07027

Cited by 4 publications

(4 citation statements)

References 45 publications

(60 reference statements)

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“…The ratio of the sum of the volume of all the pore spaces in the coal body to the volume of the coal body is the porosity of the coal body 29 . The total porosity can characterize the gas seepage capacity in the coal body to a certain extent.…”

Section: Porosity Calculation Resultsmentioning

confidence: 99%

Experimental study on freeze–thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen

Wang

et al. 2022

Sci Rep

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In this study, the surface crack-propagation law and pore damage characteristics of coal samples of different water contents after they undergo leaching in liquid nitrogen are investigated using a 4 K scientific-research camera, HC-U7 non-metal ultrasonic detector, nuclear magnetic resonance testing technology, and self-made multi-functional three axial fluid–solid coupling test system. Experimental investigations are conducted on coal samples of different water contents before and after they undergo liquid-nitrogen freezing and thawing in order to determine the propagation law of surface fissures, the development law of internal micro-fissures, the development process of internal pores, the change law of the pore-size distribution, and the law of coal-sample deformation and gas seepage during the stress process. The test results show that, with the increase in water content in the liquid-nitrogen leaching process, the frost heave force on the coal surface increases, and the greater the increase ratio of the coal porosity, the faster is the development of micro-cracks and pores. Under the action of liquid nitrogen, the number of micro-pores, meso-pores, and macro-pores in the coal sample increased, and with the formation of new cracks and the connection of the original cracks, liquid-nitrogen freezing and thawing can promote the development of the pore structure in the coal body. The permeability changes of coal samples of different water contents during unloading failure exhibit obvious stage characteristics. The above results demonstrate that the moisture content of coal has a significant effect on the development of surface cracks and pore-damage characteristics of coal after liquid-nitrogen freezing and thawing, and there is a positive correlation between the surface crack expansion and internal damage of the coal samples of different moisture contents leached in liquid nitrogen.

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Section: Porosity Calculation Resultsmentioning

confidence: 99%

Experimental study on freeze–thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen

Wang

et al. 2022

Sci Rep

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“…The large eddy model (LES) was used to simulate the characteristics of turbulence [ 37 , 38 ]. The laminar finite rate/eddy dissipation model in a turbulent premixed flame was used in the combustion process [ 39 ].…”

Section: Numerical Parameters Setting and Experimental Verificationmentioning

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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“…Therefore, revealing the reaction mechanism of natural gas combustion, determining the law of natural gas leakage and diffusion, and mastering explosion hazards contribute to safe use of gas. 5 − 7 …”

Section: Introductionmentioning

confidence: 99%

“…It can be seen that the safety of natural gas use by residents in China cannot be ignored. Therefore, revealing the reaction mechanism of natural gas combustion, determining the law of natural gas leakage and diffusion, and mastering explosion hazards contribute to safe use of gas. − …”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Cai

Liu

et al. 2022

ACS Omega

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Frequent occurrence of indoor natural gas explosion accidents seriously threatens the safety of people and property. To determine the law of indoor natural gas leakage and explosion hazards, based on experiment and simulation, the nature of natural gas explosion, the distribution law of natural gas volume fraction, flame propagation, temperature, and shock wave overpressure were studied. The results show that the flame structure can be divided into three zones, i.e., preheat zone, reaction zone, and product zone. OH + CO ⇔ H + CO 2 is the main exothermic reaction in the combustion process. The overall distribution law of natural gas volume fraction shows that the higher the position, the greater the volume fraction, and the closer the distance to the leak source at the same height, the greater the volume fraction, and the natural gas volume fraction of the hose falling off is the largest under different leakage conditions. The difference in the wrapping structure of the kitchen package has a significant impact on the diffusion distribution of natural gas. The flame development goes through five stages of ignition, slow burning, detonation, slow burning, and extinguishing. The indoor temperature reaches about 1400 °C. Although the simulated value of shock wave overpressure is larger than the experimental value, the relationship between overpressure and distance is expressed by Y = A + B * ln( X + C ). This study can provide certain technical support for natural gas accident rescue. The research can provide certain technical support for natural gas accident rescue and can also be used for accident investigation to form the determination procedure and method of leakage location and leakage amount.

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Influence of the Cavity Structure in the Excavation Roadway on the Gas Explosion Characteristics

Cited by 4 publications

References 45 publications

Experimental study on freeze–thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen

Experimental study on freeze–thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen

Propagation laws of discontinuous gas supply in the excavation roadway

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

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