Ammonia desulphurization and oxidation apparatus and method

An ammonia desulphurization and oxidation method, comprising the following steps:

• S1, circularly spraying a slurry in a tower, such that the slurry is in countercurrent contact with a SO2-containing flue gas and absorbs SO2 to form an acid-rich slurry, and the acid-rich slurry falls down and enters an ammonia distribution zone through a first gas-liquid distribution plate under an action of gravity, and then is mixed with ammonia water distributed from an ammonia water distributor in the ammonia distribution zone to allow a neutralization reaction, wherein sulfurous acid and ammonium bisulfite are converted into ammonium sulfite and the acid-rich slurry becomes a neutralized slurry;
• S2, under the action of gravity, allowing the neutralized slurry to move downward, enter an absorption zone through a second gas-liquid distribution plate, and contact with oxidizing air escaping from an oxidation zone, such that the ammonium bisulfite is subjected to deep neutralization and the ammonium sulfite is partly oxidized into ammonium sulfate;
• and
• S3, allowing the neutralized slurry to further move downward and enter the oxidation zone through a third gas-liquid distribution plate, and under an action of oxidizing air distributed from oxidizing air distributors in multiple stages, allowing the ammonium sulfite to be fully oxidized and converted into the ammonium sulfate.