Method for wet flue gas desulfurization and device for implementing said method

A wet flue gas desulfurization apparatus for effecting the desulfurization of a flue gas by contacting the flue gas with an absorption agent having calcium compounds, the apparatus comprising:

• first washer having a spray device for applying absorption agent to flue gas;
• a sump for supplying absorption agent to the first washer;
• a device for supplying oxygen to the sump for effecting the oxidation of calcium sulfite in the absorption agent to calcium sulfate thereat;
• a second washer having a spray device for applying absorption agent to flue gas which has already passed through the first washer such that the flue gas is subjected to serial applications of absorption agent due to its passage through the first washer and the second washer;
• a recovery device for at least partially recovering used absorption agent from the second washer;
• a container for the absorption agent;
• a return line from the recovery device to the container for return of absorption agent from the recovery device to the container;
• and
• means for supplying oxygen into the return line to contact absorption agent thereat such that calcium sulfite in the absorption agent is oxidized to calcium sulfate.