Wet-type exhaust gas desulfurizing apparatus

An apparatus for wet process desulfurization of exhaust gas, comprising:

• a vertically extending absorbing tower having a slurry recirculation tank at a lower portion and having an upper portion having sprayers for spraying a slurry into contact with exhaust gas fed upwardly through said upper portion;
• a plurality of precipitation preventing agitators extending through a perimetrical wall of said slurry recirculation tank at a lower portion thereof, said precipitation preventing agitators being arranged so as to contribute to a swirling flow of slurry in said recirculation tank;
• a recirculation pump having a suction port at said lower portion of said slurry recirculation tank for recirculating slurry from said slurry recirculation tank though a recirculation line to said sprayers;
• a plurality of oxidation agitators provided at an upper portion of said slurry recirculation tank above said plurality of precipitation preventing agitators and away from said suction port of said recirculation pump, each oxidation agitator comprising a rotating shaft, extending substantially horizontally through said perimetrical wall of said slurry recirculation tank and offset at an angle to a phantom line normal, where said shaft extends through said wall, to said perimetrical wall, and a propeller fixed to said rotating shaft, wherein said propeller has a backside proximal to said perimetrical wall, said plurality of oxidation agitators being arranged so as to contribute to said swirling flow of slurry in said recirculation tank;
• a plurality of nozzles extending through said perimetrical wall of said slurry recirculation tank, each of said nozzles being arranged coaxially around the rotation shaft of one of said oxidation agitators, each of said nozzles, having a distal end adjacent the backside of the propeller fixed to the rotating shaft and having a proximal end connected to a chamber;
• and
• a pressurized oxidizer gas introduction pipe for introducing pressurized oxidizer gas into each of said chambers connected to each of said plurality of nozzles;
• whereby bubbles of said oxidizer gas are generated substantially uniformly over the entire circumference and within the rotational region of each of said propeller of said plurality of oxidation agitators.