Exhaust gas treatment method and exhaust gas treatment apparatus

An exhaust gas treatment apparatus comprising:

• an upright tubular container having an internal space vertically partitioned into three chambers of an upper chamber, a middle chamber and a lower chamber as viewed in the vertical direction;
• the lower chamber containing aqueous absorption liquid in turn containing an alkaline agent and dissolved oxygen;
• the middle chamber having at the lateral wall thereof an exhaust gas introducing port for introducing exhaust gas and on the bottom thereof a plurality of exhaust gas dispersion pipes open to the internal space of the middle chamber and running through the floor thereof, the exhaust gas dispersion pipes vertically extending with their front ends penetrating into the aqueous absorption liquid contained in the lower chamber, each of the exhaust gas dispersion pipes having near its front end spouting orifices for spouting exhaust gas below the liquid surface of the aqueous absorption liquid;
• the lower chamber also having near the bottom thereof an oxygen feed means for blowing oxygen-containing gas into the aqueous absorption liquid and at the ceiling thereof a treated gas rising path open to the internal space of the lower chamber and running through the middle chamber so as to be open to the internal space of the upper chamber;
• the upper chamber having a treated gas discharge port for discharging treated gas;
• and
• the exhaust gas treatment apparatus being so arranged that the exhaust gas introduced into the middle chamber from the exhaust gas introducing port is spouted out as bubbles below the liquid surface of the aqueous absorption liquid contained in the lower chamber by way of the plurality of exhaust gas dispersion pipes, subsequently separated as treated gas in the space formed on the liquid surface of the aqueous absorption liquid and then forced to flow into the upper chamber by way of the treated gas rising path so as to be discharged from the upper chamber by way of the treated gas discharge port;
• wherein an exhaust gas introducing duct having an vertically extending region for allowing exhaust gas to flow downwardly is connected to the exhaust gas introducing port and a humidifying liquid injection means for spraying humidifying liquid downwardly into the downwardly flowing exhaust gas in the exhaust gas introducing duct is arranged in the vertically extending region.