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Method for determining the Air Change Effectiveness of the auxiliary forcing ventilation system in underground mines using CFD software

Adjiski V., Mirakovski D., Despodov Z., Mijalkovski S.

Mining Science

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2018

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Vol. 25

161--178

EN

Auxiliary forcing ventilation system is the most common air distribution system of the development headings in underground mines. This paper reports the development of numerical analysis for calculating the Air Change Effectiveness (ACE) of ventilation performance for auxiliary forcing ventilation system in underground mines. The methodology presented in this paper will be demonstrated through Computational Fluid Dynamics (CFD) modelling and calculated in accordance with ASHRAE F25-1997 methodology. Local age, Mean Age of Air (MAA) and ACE were calculated in three scenarios using CFD modelling to study the ventilation performance. ACE was calculated at locations in the development headings occupied space, based on the MAA from the same ventilation system parameters in three different scenarios. Simulation results indicate that ACE is influenced due to the involvement of objects in the development heading that can reduce the effective volume of the zone. This study provides some new ideas for measuring ACE which can provide better auxiliary ventilation system in underground mines. The proposed methodology could be applied as guidance for design and setup of auxiliary ventilation systems. Results from this CFD modelling will be used for extensive validation study which purpose will be to prove the accuracy of the methodology and, if necessary, to improve it.

2

CFD simulation of the brattice barrier method for approaching underground mine fires

Adjiski V., Mirakovski D., Despodov Z., Mijalkovski S.

Mining Science

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2016

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Vol. 23

161--172

EN

Fires are the most feared hazard in underground mines. The problems associated with under-ground mine fires calls for special techniques and treatments in its prevention and fire fighting. Each mine fire presents unique conditions from the perspective of dealing with it. The purpose of this paper is to present Computational Fluid Dynamics (CFD) simulated fire scenarios on which is tested the brattice barrier method for approaching underground mine fires. With this experimental CFD model we can de-termine the effectiveness of this method. These simulations were performed to determine if we increase the air velocity into the roof with help of brattice barrier, will this remove the smoke and heat upstream of the fire so that firefighters can approach safely and extinguish the fire. We can also observe the explosive range of the particles and gases that travel upstream of the fire and are then forced back into the fire area by this brattice barrier method.

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Simulation and optimization of evacuation routes in case of fire in underground mines

Adjiski V., Mirakovski D., Despodov Z., Mijalkovski S.

Journal of Sustainable Mining

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2015

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Vol. 14, iss. 3

133--143

EN

Risks of fire occurrence in underground mines are known for a long time. Evacuation and rescue plans allow to each underground mine to respond and establish control in case of emergency. The primary goal of this paper is to determine the optimal system for evacuation in case of fire in underground mines and through a process of computer simulation to be presented to all workers that are affected by this issue. In this study is developed a system that allows by using available software to work out the complete evacuation plans that include analysis of fire scenarios and optimal routes for evacuation. With development of database of fire scenarios, it is possible to plan routes for evacuation in all situations. This presented methodology can serve to make effective system for evacuation and rescue in case of fire and to help save lives and protect the financial investment in the mine. This methodology represents the most economical option of making an effective system for evacuation and also can serve as an idea of making a software package that includes all the steps of making a system for evacuation and rescue in case of fire in underground mines. This presented model will have increased accuracy compared to other models presented so far, because of the prepared 3D model of the underground mine which includes the actual dimensions of the mine along with its associated elements from which the fire dynamics and system for evacuation depends.