The calcium method for desulfurization uses limestone or lime as an absorbent, which is dissolved in a stirring tank to generate a Ca (OH) 2 (or Ca2CO3) solution. After the flue gas enters the absorption tower, it is evenly contacted with the spray atomized slurry in the absorption section composed of three spray layers throughout the entire absorption tower section. Acid gases such as SO2, SO3, HF, and HCl in the flue gas are effectively absorbed, while washing the fly ash in the flue gas and reducing the flue gas to saturation temperature. After SO2 is absorbed in the absorption section, calcium sulfite is generated and enriched in the absorption liquid. The absorption liquid is subjected to forced oxidation to oxidize calcium sulfite into gypsum. The gypsum solution enters the dehydration system to achieve solid-liquid separation, and the generated gypsum can be used as a building material.

After leaving the absorption section, the flue gas continuously flows through two layers of zigzag mist eliminators to remove the water mist, and the washed and purified flue gas is discharged through the chimney. This saturated type of washing can not only remove acidic gases, but also wash pollutants such as dust and heavy metals in the flue gas.

The calcium based desulfurization system includes a desulfurization agent storage, transportation, slurry preparation and supply system, an acid gas reaction and oxidation system

Desulfurization product processing system, power supply and distribution system, instrument and control system.

The efficiency of deacidification by calcium method can reach over 95%, and the combination of wet electrostatic precipitation can meet the national ultra-low emission requirements