CFD study to optimize the auxiliary ventilation system in an underground mine

Costa, Jordi Vives; Bascompta, Marc; Felipe, J. J. de; Pera, Lluís Sanmiquel

doi:10.15446/dyna.v89n221.100297

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…CSC in the goaf is intimately linked to the ventilation method of the working face and the degree of air leakage within the goaf. Many researchers have extensively studied to determine the air leakage features within the goaf with various ventilation methods [30][31][32][33][34][35]. Tian et al [36] employed the SF 6 tracer gas to test air leakage in the U-shaped ventilation working face at Wenzhuang Coal Mine.…”

Section: Coal Pillarmentioning

confidence: 99%

Mitigating Coal Spontaneous Combustion Risk within Goaf of Gob-Side Entry Retaining by Roof Cutting: Investigation of Air Leakage Characteristics and Effective Plugging Techniques

Zhang,

Chen,

et al. 2024

Fire

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Relative to conventional coal pillar retention mining technology (the 121 mining method), gob-side entry retaining by cutting roof (the 110 mining method), a non-pillar mining technique, efficiently addresses issues like poor coal resource recovery and significant rock burst damage. Nonetheless, the open-type goaf created by 110 mining techniques suffers from complex and significant air leaks, increasing the likelihood of coal spontaneous combustion (CSC) within the gob area. To address the CSC problem caused by complex air leakage within the goaf of gob-side entry retaining by roof cutting, this study takes the 17202 working face of Dongrong Second Coal Mine as the object of study. Field tests and simulation calculations are conducted to research the features of air leakage and the distribution of the oxidation zone within the goaf. Subsequently, plugging technology with varying plugging lengths is proposed and implemented. The tests and simulations reveal that the airflow migration within the goaf follows an L-shaped pattern, while air leakage primarily originates from gaps found in the gob-side entry retaining wall. The amount of air leaking into the gob-side entry retaining section is 171.59 m3/min, which represents 7.3% of the overall airflow. The maximum oxidation zone within the goaf ranges from 58.7 m to 151.8 m. After the air leakage is blocked, the airflow migration route within the goaf is transformed into a U-shaped distribution, and the maximum oxidation zone range changes from 42.8 m to 80.7 m. Engineering practice demonstrates that after air leakage plugging, the total air leakage volume within the gob-side entry retaining section significantly reduces to 20.59 m3/min, representing only 0.78% of the total airflow volume. This research provides reference on how to prevent the occurrence of CSC in similar mine goafs.

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Section: Coal Pillarmentioning

confidence: 99%

Mitigating Coal Spontaneous Combustion Risk within Goaf of Gob-Side Entry Retaining by Roof Cutting: Investigation of Air Leakage Characteristics and Effective Plugging Techniques

Zhang,

Chen,

et al. 2024

Fire

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“…Unlike commercial codes, open-source programs are cheap and accessible; hence, this is an emerging area for CFD codes. FLOW-3D [8] is another program with an ability to solve free surface problems. Certain special codes have also been developed for fire analysis.…”

Section: Cfd Codesmentioning

confidence: 99%

“…In another study, Vives et al [8] investigate the airflow and temperature in the working face of mines in the presence of one excavator and one dump truck. Four cases, related to the length and angle of the exhaust duct, are considered to identify an optimal design.…”

Section: Ventilation At the Working Faces Of Minesmentioning

confidence: 99%

Applications of Computational Fluid Dynamics for Mine Ventilation in Mineral Development

et al. 2022

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In this paper, the application status of computational fluid dynamics (CFD) modeling in mine ventilation is presented by reviewing papers published since the year 2000. The aspects covered in these papers are the numerical analyses of working faces, mine tunnels, ventilation systems, and open-pit mines. CFD modeling procedures for mine ventilation are summarized. Further, building geometries, grid generation, solutions of equations, model validation, grid-independence studies, and solution convergence are discussed. Several examples of CFD modeling for mine ventilation are provided. Finally, conclusions including recommendations for future studies that may allow for more advantageous applications of such numerical simulations are provided.

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Thermal environment improvement of underground mine tunneling face using enhanced geothermal system technology

et al. 2023

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To solve the problem of high-temperature thermal damages to the mine underground driving working face of a dry-hot-rock-enriched area, an active cooling method for fracturing water injection of the surrounding rock of the deep mine is proposed based on analysis of the heat dissipation mechanism of the surrounding rock. An artificial thermal reservoir is formed in the high-temperature rock mass around the tunneling roadway by stimulation, such as a high-pressure crack, and the heat energy of the surrounding rock is extracted by heat exchange of the heat-carrying fluid and the high-temperature rocks mass to reduce the ambient temperature of the roadway. The design of a down hole water injection cooling system based on enhanced geothermal system (EGS) technology is presented and a simplified EGS heats collection model is used for fluid-enclosure. Numerical simulation of the temperature field of the rock coupling shows that the temperature of the surrounding rock can be effectively reduced by increasing the water injection speed and fracture porosity, and improvement of the underground thermal environment can improve the working efficiency. For a water injection rate of 14m/s and porosity of0.18, the average cross section temperature was 41.95?C, which is nearly 5?C lower than the original rock temperature of 46.85?C.

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CFD study to optimize the auxiliary ventilation system in an underground mine

Cited by 4 publications

References 21 publications

Mitigating Coal Spontaneous Combustion Risk within Goaf of Gob-Side Entry Retaining by Roof Cutting: Investigation of Air Leakage Characteristics and Effective Plugging Techniques

Mitigating Coal Spontaneous Combustion Risk within Goaf of Gob-Side Entry Retaining by Roof Cutting: Investigation of Air Leakage Characteristics and Effective Plugging Techniques

Applications of Computational Fluid Dynamics for Mine Ventilation in Mineral Development

Thermal environment improvement of underground mine tunneling face using enhanced geothermal system technology

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