Mine Ventilation Systems Missouri ST（矿井通风系统密苏里州科技）.pdfVIP

9 Mine Ventilation Systems Practical Mine Ventilation Engineering to be Published by Intertec Puslishing Co. Ventilation is the control of air movement, its amount, and direction. Although it contributes noth- ing directly to the production phase of an operation, the lack of proper ventilation often will cause lower worker efficiency and decreased productivity, increased accident rates, and absenteeism. Air is necessary not only for breathing but also to disperse chemical and physical contaminants (gases, dusts, heat, and humidity). In the U.S., as well as in the rest of the world, mine ventilation practice is heavily regulated, especially in coal and gassy (noncoal) mines, and other statutes relate to air quantities required to dilute diesel emissions, blasting fumes, radiation, dusts, battery emis- sions, and many other contaminants. To ensure adequate ventilation of a mine, provision is made for suitable paths (airways or aircourses) for the air to flow down the mine to the working places and suitable routes out of the mine when it has become unsuitable for further use. The primary ventilation system thus consists of an intake or intakes (or downcasts) through which the fresh air passes, the mine workings, and an exhaust or exhausts (or upcasts) where the air passes after having ventilated the working places of the mine. Mine fans can be installed on the intake airshaft, return airshafts, or both, either on the surface or underground (Figure 9-1). Mine Fan D U o p w Mined out Area c a n s