Technical principle

Ammoniadesulphurization technology on the basis of NH3 and SO2 reaction, In themulti-function flue gas desulfurization absorption tower, Ammonia to absorb theSO2 in flue gas bydesulfurization intermediate products (hydrogen) ammonium bisulfite solution,See reaction equation (1). The blowing air, and then direct oxidation ofammonium bisulfite (hydrogen) into ammonium sulfate, See reaction equation (2).

 (1)  SO2+ H2O + xNH3 = (NH4)xH2-xSO3

 (2)  (NH4)xH2-xSO3+ 1/2O2 + (2-x)NH3 = (NH4)2SO4

Boiler (power plants) flue gas desulfurization

Process description

Flue-gas system: Flue gas into the desulfurization absorptiontower, after cooling, washing, demist, Into the chimney and emission onstandard.

Absorption system: Absorption of ammonium bisulfite oxidized forming into ammonium sulfate. Ammoniumsulfate solution to reduce the flue gas temperature and evaporativewater, A furtherincrease their own concentration.

Ammonium sulphate system: Adopt saturated crystallization process,Absorption system to produce a solid content of ammonium sulfate slurry, andthen to solid-liquid separation, drying and packing, Output of ammonia sulfate goods. Adopt the evaporation crystallizationprocess, to set the evaporation crystallization system is absorptionsystem to produce ammonium sulfate solution for evaporation crystallization,and then to solid-liquid separation, drying and packing, Output of ammonium sulfate goods.

Performance indicators: Ammonia recovery ≥99%     SO2 ≤35 mg/Nm3    NH3 ≤5mg/Nm3    Particulate matter ≤5mg/Nm3