Wet-type exhaust gas desulfurization system having a means for supplying air

In a wet exhaust gas desulfurization system having a vertical absorption tower and means for supplying air thereto in which an exhaust gas desulfurization is performed by gas-liquid contact between the exhaust gas containing sulfur oxides and an absorbing solution containing a calcium compound in the absorbing tower, the improvement which comprises said system having:

• a) a reservoir in fluid communication with and below the tower for trapping the absorbing solution which has absorbed sulfur oxides from the exhaust gas;
• b) an absorbing solution circulating tank in fluid communication with and below the reservoir;
• c) the reservoir having exit pipes in a lower portion thereof to withdraw absorbing solution therefrom, and the circulating tank having entrance pipes for introducing absorbing liquid from the exit pipes into the tank, the entrance pipes having a portion exterior of the tank and a portion interior of the tank, said interior portion extending beneath the surface of any absorbing solution therein, the exterior portion having a diameter larger than the diameter of the exit pipe, and wherein a lower end of the exit pipe is fitted into the exterior portion of said entrance pipe and cooperates therewith to aspirate outside air into absorbing solution as it passes from the exit pipe to the entrance pipe.