Importance

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Abstract

A system for the treatment of exhaust gases flowing in and/or flowing out from a tunnel (T) overlying a roadway (R) through a ventilation duct (TV). The system comprises: filtering means (20) to filter the exhaust gases passing through the ventilation duct (TV); fan means (V) to force the evacuation of exhaust gases from the tunnel (T) towards the outer environment or the inflow of the exhaust gases from the outer environment into the tunnel (T) through the ventilation duct (TV); detecting means (10) of at least one parameter of the exhaust gases; control means (30) to activate the filtering means (20) in response to the detection by the first (10) of the exceeding of a predetermined threshold value of the at least one parameter. The filtering means (20) comprise at least one filtering unit (20′, 20″, 20′″) that includes: at least one water reservoir (21); pumping means which include at least one high pressure pump (22); a plurality of high pressure nozzles (24) to spray atomized water into drops having an average diameter lower than 500 μm, preferably lower than 250 μm, and at a minimum working pressure of 150 bar, preferably at a minimum working pressure of 200 bar; a line of fluid connection (25) of said at least one water reservoir (21) with said high pressure nozzles (24) passing through said pumping means (22).

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First Claim