Patent ID: 8784740

Claim:
An exhaust gas denitrizer comprising: a main duct adapted to pass exhaust combustion gas discharged from a furnace and containing sulfur oxides and nitrogen oxides; a heat exchanger placed in the main duct and adapted to cool the exhaust combustion gas by heat exchange; a bypass duct adapted to branch off from the main duct upstream of the heat exchanger, bypass the heat exchanger, and rejoin the main duct; an ammonia feed system adapted to supply ammonia gas to the exhaust combustion gas after bypass exhaust gas flowing through the bypass duct rejoins main exhaust gas flowing through the main duct; and a denitrification reactor adapted to remove nitrogen oxides from the exhaust combustion gas supplied with the ammonia gas, wherein at a meeting place between the main exhaust gas and the bypass exhaust gas in the main duct, a plurality of partition plates are installed with plate surfaces turned to an inflow direction of the bypass exhaust gas, partitioning a main exhaust gas channel into a plurality of sub-channels along a flowing direction of the main exhaust gas, where upstream-side ends of the plurality of partition plates along an inflow direction of the main exhaust gas face the incoming bypass exhaust gas by being shifted from one another toward an upstream side of the main exhaust gas starting from an inflow side of the bypass exhaust gas, and further comprising a turnable adjustment vane installed at the meeting place of the bypass duct and the main duct to adjust flow direction of the bypass exhaust gas flowing into the main duct.