The primary ventilation is responsible for the total volumetric flow through the mine and the auxiliary ventilation is responsible for the ventilation of the development ends, production areas, and facilities disconnected from the main circuit with no through-ventilation connections. The ventilation of underground mines, irrespective of the type of mine and mining method, is divided into two broad branches, the primary ventilation and secondary or auxiliary ventilation. The outcomes of this investigation will help ventilation engineers in deciding the optimum duct fan system required for sufficient ventilation. For the exhausting ducted fan system, higher flow rates were achieved by reducing the duct mouth to face distance, and increasing the fan design flow rate and duct diameter. The study showed that recirculation for a forcing ducted fan system can be reduced by increasing the duct diameter or increasing the duct mouth to face distance. Estimation models were developed, which can be used to calculate the flow rate close to the face of the empty heading for different settings of the system variables studied. The diameter of the duct, duct mouth to face distance, and the power of the fan (quantity delivered by the fan) were varied and their effect on ventilation determined through a comparative analysis of the flow rates calculated close to the face of the heading. The effect of some of the system variables in forcing and exhausting ducted fan systems on ventilation in an empty heading was investigated using computational fluid dynamics(CFD) and comparative analyses. School of Mining Engineering, University of the Witwatersrand, South Africa
Analysis of the effect of ducted fan system variables on ventilation in an empty heading using CFD
0 kommentar(er)
