Reversal Ventilation as a Method of Fire Hazard Mitigation in the Mines

Pach, Grzegorz; Różański, Zenon; Wrona, Paweł; Niewiadomski, Adam; Zapletal, Pavel; Zubíček, Václav

doi:10.3390/en13071755

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Many measures have been studied following the statements from the two previous paragraphs. Analyzing the best evacuation routes [36], the usage of airflow reversal [37], applying different techniques to extinguish the fire [15] such as foam [38,39], or recasting the traditional sealing method [23] into a new dynamic seal [40]. Other approaches, like the determination of the limit conditions for firefighters [12] or early detection systems [41] have also been proposed.…”

Section: Mine Fires In Undergorund Coal Minesmentioning

confidence: 99%

Analysis of the Fire Propagation in a Sublevel Coal Mine

et al. 2020

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A fire has been analyzed in a real underground coal mine, using a sublevel method, during an entire year. The study was focused on the collapsed area, reproducing a real mixture formed by coal, waste, and air gap. The analysis was done by means of an experimental analysis, a computational fuid dynamic model (CFD), and simulations using a mine ventilation software. Three scenarios were determined and studied regarding their influence on the evolution of the fire: (a) development of the fire without taking any action, (b) sealing off the affected areas, and (c) sealing and reducing the ventilation in the affected area and surrounding drifts. The study revealed the behavior of the fire in a real mine and the effectiveness of the main fire-fighting measures over time, verifying that none of the measures taken could eliminate the fire-induced in the collapsed area.

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Section: Mine Fires In Undergorund Coal Minesmentioning

confidence: 99%

Analysis of the Fire Propagation in a Sublevel Coal Mine

et al. 2020

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“…In conclusion, they stated that the conducted studies provide the possibility to design an optimized intermittent ventilation pattern with the same conception of FTC based on the spatiotemporal characteristics of air flow behavior and methane distribution. Pach et al [10] analyzed reversal ventilation as a prevention method against fire hazards in underground mines. They also considered the occurrence of methane hazards in their research.…”

Section: Introductionmentioning

confidence: 99%

Conditions That Determine Changing the Function of Mine Shafts in a Gassy Coal Mine—A Case Study

Szlązak,

Korzec

2024

Energies

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Ventilation plays a key role in ensuring safe exploitation in underground gassy mines. Over the years, the structure of a mine’s ventilation network changes. Therefore, it becomes necessary to construct new excavations, while some existing excavations lose their potential for future mining activity. Constructing new excavations, especially shafts, is very expensive. Therefore, mine operators are looking for solutions to ensure appropriate ventilation by reorganizing the ventilation network and using existing infrastructure, including shafts. This article presents the example of a coal mine located in the Upper Silesian Coal Basin in Poland to discuss the factors relevant to switching the function of one of the central shafts from a downcast function to an upcast one. This change is accompanied by the closure of a peripheral upcast shaft. The main aim of this change is to assess the possibility of further safe operation without the construction of new shafts. This action also results in the release of the coal currently closed in the pillar of the shaft being closed. Using a numerical model of the mine ventilation network allowed for the comparison of the considered solutions before making final decisions and implementing changes in the network. The calculations showed that it is possible to provide appropriate ventilation in the mine, but it would need to take into account certain technological assumptions, like the additional technical function of the changed shaft. This article discusses the advantages and disadvantages of modifications to the mine ventilation network, as well as their guiding principles, in the context of existing methane hazards. The procedure presented in this article can be adopted in other mine ventilation networks in which analogous modifications are considered.

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“…It can predict fluctuation of wind pressure in the network and help control fan regulation in advance to prevent enlarging the scope of disasters. The three-dimensional field of fire development in unconnected excavation roadways is poorly dealt with [8].…”

Section: Introduction 1research Motivationmentioning

confidence: 99%

Study on the Temperature and Smoke Movement in the Event of a Fire in a Semiclosed Tunnel under Water Spray

Li,

Zhang,

et al. 2023

Fire

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Semiclosed tunnels are very common in engineering construction. They are not connected, so they easily accumulate heat. Once a fire breaks out in a semiclosed tunnel, the route for rescue workers to enter is limited, so it is tough to get close to the fire source. In this paper, taking a mine excavation roadway with local pressure ventilation as an example, the temperature field distribution and water spray fire prevention characteristics of the excavation roadway face were studied using numerical simulation and theoretical analysis. This paper provides an explanation of a dynamics-based smoke management method for water spraying in a semiclosed tunnel as well as the equilibrium relationship between droplet drag force and smoke buoyancy. A method was first developed to calculate the quantity of smoke blockage based on the thickness of the smoke congestion. The local ventilation and smoke movement created a circulating flow in the excavation face, which was discovered by investigating the velocity and temperature fields of the excavation face. The size of the high-temperature area and the pattern of temperature stratification varied due to this circulating flow. When local ventilation and sprinkler systems were operating simultaneously, when the volume of smoke was small, the smoke avoided the majority of the water spray effect with the circulation flow; however, when the volume of smoke was large, the effect of the circulation flow decreased and the smoke gathered close to the sprinkler head. At this time, the blocking effect of the water spray was significant. The mean square error analysis revealed that activating the sprinkler had the most significant cooling impact on the wall on one side of the air duct.

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Reversal Ventilation as a Method of Fire Hazard Mitigation in the Mines

Cited by 7 publications

References 22 publications

Analysis of the Fire Propagation in a Sublevel Coal Mine

Analysis of the Fire Propagation in a Sublevel Coal Mine

Conditions That Determine Changing the Function of Mine Shafts in a Gassy Coal Mine—A Case Study

Study on the Temperature and Smoke Movement in the Event of a Fire in a Semiclosed Tunnel under Water Spray

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