Patent ID: 7645430

Claim:
A horizontal duct scrubbing system for removing gaseous pollutant from a gas, the horizontal duct scrubbing system comprising: (a) a horizontally disposed housing having a waste gas inlet for receiving a gas stream and a treated gas outlet for discharging the gas stream, wherein the gas stream includes at least some gaseous pollutants when it enters the waste gas inlet; (b) a liquid inlet manifold disposed within the horizontally disposed housing, the liquid inlet manifold comprising a plurality of nozzles oriented to spray a scrubbing liquor co-current to the flow of the gas stream; (i) wherein the plurality of nozzles of the liquid inlet manifold are configured to spray the scrubbing liquor at an average flow rate (L) of less than 20 gallons per minute per 1000 actual cubic feet per minute (ACFM) of water saturated gas stream flow exiting the waste gas inlet (G); (ii) wherein each of the plurality of nozzle is configured to eject the scrubbing liquor at a pressure of at least about 40 psig and at a flow rate of not greater than about 50 gpm; (c) a demister located proximal the treated gas outlet, wherein the horizontally disposed housing is substantially free of flow deflection members between the liquid inlet manifold and the demister; and (d) a cooling spray proximal the waste gas inlet and upstream of the liquid inlet manifold, wherein the cooling spray is configured to pre-humidify the gas stream.