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Mine Ventilation Principles.
Harris-EJ; Dalzell-RW; Stevenson-JW
Subsection 16 2 in SME Mining Engineering Handbook 1:16-5to16-33
Techniques of airflow quantity determination in underground mines are presented for low, moderate, and high air-velocity conditions. Use of chemical smoke, rotating vane anemometers, and pilot tubes for air velocity measurements are described, and appropriate calculations are provided. The fundamental principles of airflow through underground passageways and those factors governing such flow are discussed, and the common pressure loss equation for mine ventilation calculations, h = rq2, is developed. In addition, the advantages of utilizing multiple passageways connected in parallel for underground airflow distribution are reviewed, methods of calculating the resistance of parallel flow circuits are presented, and the mine resistance curve is illustrated. Mechanical ventilation of mines by fans is described and the use of fan characteristic curves, in conjunction with the mine resistance curve to predict fan performance, is discussed and illustrated. Fan operation individually, in series with another fan, in parallel with another fan, and in series/parallel combinations are discussed and illustrated by fan characteristics, mine resistance curves. [a graphic technique for determining fan performance when operated in series/parallel combination with another fan is illustrated and discussed.]
Subsection 16.2 in SME Mining Engineering Handbook, Vol. 1, PP. 16-5 to 16-33