Patent ID: 9546549
Date: 2017-01-17
CPC Classifications: E21F

Claim:
1. A traffic tunnel ventilation system comprising: a recirculation air flow system configured to be disposed within a traffic tunnel or a covered road section in which road traffic travels, the tunnel or covered road section having at least one tunnel tube with a first entrance and a first exit for the road traffic to pass through the at least one tunnel tube, the recirculation air flow system comprising air pumps to control flow through the recirculation air flow system such that air flows from the first air curtain through the at least at least one tunnel tube to the second air curtain and through the supply line to the second air curtain; at least one air filter for pollutants in a suction line of one of the air pumps filtering said pollutants from the recirculation air flow system; a control unit connected to each of the air pumps and controlling each of the air pumps; and one or more sensors that sense a concentration of pollutants through the tunnel and provide signals indicative of the sensed concentration of pollutants to the control unit, wherein the first air curtain and the second air curtain comprise an air flow transverse to a direction of movement of the traffic in the at least one tube tunnel to form a barrier against the air flow in the recirculation air flow system containing particles from leaving the at least one tube tunnel, and wherein the control unit controls the air pumps to control the strength of the second air curtain to controllably discharge at least a portion of the entrained air flow based on the sensed concentration of pollutants through the tunnel.