Ventilation systems are required during the construction of tunnels and mining roadways to provide a safe environment for workers and dilute the blasting fumes and combustion gases from diesel equipment. In addition, according to the international regulations, a minimal air speed in the underground infrastructure must also be guaranteed. The schematic diagram of a typical auxiliary ventilation system of dead-end tunnels and mining roadways is shown in Fig. 1.
Fig. 1. Schematic diagram of a typical auxiliary ventilation system of dead-end tunnels and mining roadways.
The ducting system and auxiliary fan must be sized to ensure the required airflow to the working face. However, to design the ducting system, the size of the tunnel and mobile equipment must be considered to allow sufficient clearance between the vent duct and mobile equipment. The axial fans are located at the tunnel portal to avoid the re-circulation of dirty air in the ventilation circuit. The power of the fans depends on the total pressure and the delivered airflow. Forced ventilation modes with leaky flexible ducts are generally used to supply fresh air directly to the working face in dead-end tunnels. The dirty air returns towards the tunnel portal through the tunnel section.
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Product
Lay Flat Ventilation duct
Spiral Ventilation Duct
Tunnel Ventilation Duct
Mine Ventilation Duct
PVC Coated Fabric
PVC /EVA Waterproofing Membrane
Feature
High-quality
Freight savings
High-performance
Safety
Environmental protection
Cost savings
Flame resistance
Anti -static
