鉱山での通気網解析の実態および解析方法の改善 [in Japanese] The Actual Conditions of Ventilation Network Analysis in Various Mines and the Improvements of the Analysis [in Japanese]
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First, this paper describes the overview of the data relevant to the mine ventilation such as the total volume of ventilation air, the number of fans, the size of ventilation network, etc. and the procedures of calculation of the airflow distribution which are actually employed in various mines. Then statistical analysis of the ventilation networks are given. As a result it is found that too small friction factors or too small ventilation resistances are being used in almost all network analyses. This may be one of the major reasons for the inaccuracy of the ventilation network analyses and therefore particular attention should be given to the fact when ventilation network data are compiled. The calculation time required for an airflow distribution analysis depends not only on the method of calculation for a node pressure but also on the method how to consider a fan characteristics. The paper also describes the new method for the calculation of the airflow rate by the fan, which enhances the calculation speed and the stability of the analysis. Finally, an improved node potential method for calculating the pressure of two nodes at both ends of an airway simultaneously is proposed. The calculation time is reduced to 55 % on the average through these improvements.
- Journal of MMIJ
Journal of MMIJ 114(3), 183-188, 1998-03-25
The Mining and Materials Processing Institute of Japan