Simulation Study of Gas Explosion Propagation Law in Coal Mining Face With Different Ventilation Modes

Li, Jiajia; Yang, Zhigang; Chen, Shouqi; Nie, Zishuo; Yang, Di

doi:10.3389/fenrg.2022.846500

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…This model is well-suited for forecasting indoor airflow distribution and has demonstrated its effectiveness, particularly under mixed convection conditions (Ling et al, 2015). In this study, the SIMPLE (semi-implicit method for pressure dependent equations) pressure-velocity coupling algorithm is used (Fan et al, 2022;Liu et al, 2022;Mohamed et al, 2022).…”

Section: Geometric Model and Numerical Methodsmentioning

confidence: 99%

Influence of deflectors on indoor airflow velocity distribution under natural ventilation conditions

Wang,

Jin,

Cheng

2024

Front. Energy Res.

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Deflectors offer a cost-effective solution for enhancing airflow distribution. The purpose of this paper is to investigate the effect of the deflector on the indoor airflow velocity distribution under natural ventilation conditions. The results obtained from numerical simulations are validated through experimental measurements using a reduced-scale model. Subsequently, the validated reduced-scale numerical model was extended to full-size rooms. A full-size numerical simulation method is used to analyze the effect of no deflector, deflectors with different opening width-to-height ratios and deflectors with different opening shapes on the percentage of indoor velocity partitions under natural ventilation conditions. The findings reveal that the judicious installation of deflectors can enhance indoor airflow velocity distribution and increase the percentage of the indoor comfort zone. Deflectors with different opening width-to-height ratios exert distinct influences on indoor airflow velocity distribution. When the deflector opening width-to-height ratio is set at 7/6, the indoor comfort zone percentage reaches its maximum at 75.98%. Furthermore, the shape of the deflector’s opening significantly affects indoor airflow velocity distribution, and when the opening shape is a rhombus shape of 4.00 cm × 9.00 cm, the proportion of indoor velocity comfort zone is the largest, which is 75.56%. This study provides a reference for the design and practice of natural ventilation in buildings.

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Section: Geometric Model and Numerical Methodsmentioning

confidence: 99%

Influence of deflectors on indoor airflow velocity distribution under natural ventilation conditions

Wang,

Jin,

Cheng

2024

Front. Energy Res.

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“…Using the same method, Li 19,20 numerically simulated the process in which gas explosions induce different amounts of deposited CD to participate in the explosion. The simulation results demonstrated that as the amount of CD involved in the explosion grows, the flame front gradually shrinks and extinguishes, no longer being "long and linear"; in addition, the combustion of deposited CD is delayed compared with the situation where the amount of CD is small.…”

Section: Related Scholars Have Conducted Extensive Physical Experimentsmentioning

confidence: 99%

Study on flame propagation characteristics of deposited coal dust explosion induced by pressure waves of different intensities

et al. 2023

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In the hope of studying the laws of secondary explosion induced by gas explosion shock waves lifting deposited coal dust (CD) in coal mines, the paper discusses the explosion overpressure, composite flame propagation characteristics and the acceleration mechanism of composite flame with the aid of a self‐built gas explosion experiment pipeline. The experimental results demonstrate that under the methane concentrations of 7.5%, 9.5% and 11.5%, the explosion time‐overpressure curves present same variation trend at different measuring points. Specifically, they all surge first, then decrease to a negative value and increase in oscillations, ultimately stabilizing at around 0 MPa. The presence of deposited CD in the reaction has an insignificant impact on the explosion overpressure at the measuring points, and the maximum overpressures all appear near the P2 (0.75 m away from the ignition source) measuring point. However, the deposited CD exerts a considerable influence on the flame's instantaneous velocity, especially on the flame structure during flame propagation. In stark contrast, when the methane concentration is 7.5%, the single flame has a larger instantaneous velocity than the composite flame and it exhibits finger flame, flat flame and tulip flame successively. Compared with the blue flame produced by pure methane combustion, the composite flame shows a bright white light strip that is distributed along the pipeline axis, accompanied by more obvious stratified combustion. The high‐pressure wave intensity and the flame front temperature jointly promote the overall turbulence intensity in the area where CD is swept up, resulting in continuous acceleration of the composite flame.

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“…Long-wall WFs are broadly employed in China’s coal mines, and their ventilation modes can be divided into types such as “U”, “Y”, “W”, etc. According to actual situations in mines and the characteristics of production in mines, a reasonable selection and scientific formulation of a ventilation mode and a ventilation plan could achieve a scheme for safer production 1 – 5 . A great deal of research has been done concerning those issues.…”

Section: Introductionmentioning

confidence: 99%

Research on controlling gas overrun in a working face based on gob-side entry retaining by utilizing ventilation type “Y”

Zhou

Jing

2023

Sci Rep

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To determine the characteristics of air leakage concerning a “Y” type ventilation in gob-side entry retaining with roof cutting, pressure relief, and the law of a resulted gas accumulation (GA), research is conducted by employing the CFD simulation incorporated with the gauged parameters of working face (WF) mining to analyze the air leakage of “Y” type ventilation. For this purpose, the 1201 fully mechanized coal mining face in the south Wu mining location of the Daxing coal mine is taken as an illustrative example to study the air leakage in the “Y” type ventilation. So, the gas concentration (GC) issue surpassing the limit in the upper corner of the goaf was simulated. The results show that the goaf is formed into an open space when roof cutting and pressure relief technology along the goaf is implemented. The air pressure at the upper corner of the WF would be the lowest, which is only 1.12 Pa. The airflow of air leakage under a pressure difference would move from the gob-side entry retaining to the goaf. Moreover, the simulation of mine ventilation indicates that the volume of air leakage positively correlates with the length of gob-side entry retaining. When the WF is advanced 500 m ahead, the maximum volume of air leakage would reach 247 m3/min within the range of 500–1300 m, and then the rate of air leakage gradually would decrease. When the WF is advanced at 1300 m, the air leakage would become the smallest, which is 175 m3/min. When gas control is under consideration, the effect of gas extraction would be best with the buried pipe whose depth and diameter are set to 4.0 m and 400 mm, respectively. So, the GC in the upper corner would become 0.37%. After the high-level borehole with a 120 mm diameter is mined, the GC in the deep goaf decreased to 3.52%, and the GC at the upper corner became further reduced to 0.21%. While the high-level borehole gas is extracted by employing the extraction system of the high-concentration gas, the extraction system of low-concentration gas is utilized to extract the upper corner gas of the WF, thus, the problem of gas overrun was resolved satisfactorily. During the recovery period of the mining, the GC at each gauging point was less than 0.8%, which effectively guided the secure production in the Daxing coal mine and provided a theoretical foundation to control gas overrun during the mining process.

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Simulation Study of Gas Explosion Propagation Law in Coal Mining Face With Different Ventilation Modes

Cited by 4 publications

References 26 publications

Influence of deflectors on indoor airflow velocity distribution under natural ventilation conditions

Influence of deflectors on indoor airflow velocity distribution under natural ventilation conditions

Study on flame propagation characteristics of deposited coal dust explosion induced by pressure waves of different intensities

Research on controlling gas overrun in a working face based on gob-side entry retaining by utilizing ventilation type “Y”

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