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Evaluation of line brattice length in an empty heading to improve air flow rate at the face using CFD

International Journal of Mining Science and Technology 2017年第2期27卷 253-259页

作者： Feroze Tariq genc bekir School of Mining Engineering University of the WitwatersrandJohannesburg 2050South Africa

The effectiveness of line brattice(LB) ventilation system depends on the associated system ***, the effect of these variables on the air flow rates close to the face of the heading is not extensively studied. In this paper, the effect of the LB length in relation to the LB-wall distance on the air flow rate reaching the face is analysed. Scenarios were developed using four LB lengths, two LB-wall distances and two heading depths. These scenarios were simulated with a validated CFD model. The air flow rates and patterns at various locations inside the heading were analysed. This helped to find the minimum LB-face distance that should be maintained for each LB-wall distance to maximise the air flow rate at the face. The minimum length when used will improve ventilation and reduce energy cost.

关键词： Coal mine ventilation Auxiliary ventilation Line brattice ventilation system Computational fluid dynamics

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Spontaneous combustion liability between coal seams: A thermogravimetric study

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International Journal of Mining Science and Technology 2020年第5期30卷 691-698页

作者： Moshood Onifade bekir genc Samson Bada Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh City 700000Viet Nam Faculty of Applied Sciences Ton Duc Thang UniversityHo Chi Minh City 700000Viet Nam School of Mining Engineering University of the WitwatersrandJohannesburg 2050South Africa Clean Coal and Sustainable Energy Research Group Faculty of Engineering and the Built EnvironmentUniversity of the WitwatersrandJohannesburg 2050South Africa

The spontaneous combustion liability of coal can be determined by using different experimental *** techniques are well-known in their application,but no certain test method has become a standard to prove the reliability of all of them.A general characterisation which included proximate and ultimate analyses,petrographic properties and spontaneous combustion tests(thermogravimetric analysis(TGA)and the Wits-Ehac tests)were conducted on fourteen coal and four coal-shale *** spontaneous combustion liability of these samples collected between coal seams(above and below)were predicted using the TGA and the Wits-Ehac *** different heating rates(3,6,9,15,20 and 25C/min)were selected based on the deviation coefficient to obtain different derivative slopes and a liability index termed the TGspc *** study found that coal and coal-shale undergo spontaneous combustion between coal seams when exposed to oxygen in the *** intrinsic properties and proneness towards spontaneous combustion differ considerably from one seam to the *** Wits-Ehac test results agreed with the TGspc results to a certain extent and revealed the incidents of spontaneous combustion in the coal mines.

关键词： Crossing-point temperature Thermogravimetric analysis Wits-Ehac index TGspc index

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Dynamic simulation of an opencast coal mine: a case study

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International Journal of Coal Science & Technology 2020年第1期7卷 164-181页

作者： Kesavan Muniappen bekir genc School of Mining Engineering University of the WitwatersrandJohannesburgSouth Africa

Dynamic simulations are powerful tools,but only if they are developed using the correct methodology,and with information that has been *** houses rely on simulation to confirm that complex,integrated systems can achieve design capacity before investment decisions are *** conducted in the realm of validation can make an invaluable contribution to the success of future projects undertaken around the *** mine a life of mine extension project was approved for implementation when export coal prices were on the low end of the price *** dynamic simulation of the full materials handling value chain conducted during the project feasibility study in 2016 was of utmost importance and provided assurance to the project review team that annual production targets can be *** simulation development methodology was based on a unique approach that reduced time spent on the *** completion of project construction and commissioning in 2018,it was essential to validate the simulation,which could lead to the adoption of this approach on future *** paper explains the steps taken to validate the dynamic *** case study confirmed that dynamic simulation can add value and predict mining system performance,such that informed decisions can be made.

关键词： Simulation Gensym G2 System performance Life of mine Coal mining

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Risk Neutral Options Based on Maximum Profits

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Journal of Modern Accounting and Auditing 2020年第12期16卷 523-533页

作者： Veriyadi Variyadi bekir genc WITS University JohannesburgSouth Africa

This study uses risk-neutral-probability(RNP,thereafter)to forecast future excepted profits in copper,gold,and platinum group *** RNP measures are advantageous where ones want to compare values of the same asset in different *** the heart of this study is using future profits based on a binomial tree,which has ***,RNP profits converge more to the future-normal ***,the robustness results based on the vector autoregressive(hereon,VAR)model reveal that the profits react differently to different shocks stages from revenues,risk-free interest rates and *** findings of this study apply to copper,gold,and platinum mining around the globe.

关键词： option profit risk-neutral-probability

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