PURPOSE: To attain to reduce utility and to simplify an installation, by a method wherein an absorbing liquid withdrawn from an absorbing process is guided to an ejector and subjected to gas-liquid contact with the part of exhaust gas containing sulfur dioxide gas and oxygen.
CONSTITUTION: Exhaust gas 101 is guided to a dust removing tower 1 to be introduced into an absorbing tower 3 and sulfur oxide in the exhaust gas 101 is absorbed and removed by a calcium type absorbent slurry 22. The reaction slurry is guided to an ejector 8 and the gas 33 from which dust is removed in the dust removing tower is absorbed with said slurry 22 passing through the ejector 8. In this case, the unreacted absorbent in the reaction slurry is reacted with SO2 in the gas to be converted to sulfite which is, in turn, oxidized by O2 in the gas along with sulfite formed in the absorbing process to be converted to sulfate.
ASANO HIROMITSU
NOZAWA SHIGERU
