The air knife system has an air knife system for the ventilating of the ship's bedroom and the studio, a drum for the boiler, an air knife system, an air knife system for transporting the explosive gas in the pump room, and an air knife system for the thrust of the hovercraft.
The air volume required by the air knife system should be calculated according to the allowable value of the harmful gas in the tunnel after the train passes through the tunnel, and the piston action between the trains should be considered. The allowable concentration of harmful gases, the air knife system is calculated by using a steam locomotive with a carbon monoxide of not more than 30 mg/m3. When using internal combustion engine traction, it is currently possible to calculate acrolein no more than 2 mg/m3. For tunnels in the plateau, the sensitive effects of harmful gases on the human body should be considered. The allowable time of the air knife system should generally be calculated from the time between the exit of the train and the time before the next train entering the tunnel, but not more than 15 minutes.
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