1）Ammonia flue gasdesulfurization unit of this project is using ammonia as an absorbent, andsulfur dioxide in flue gas to react quickly to produce the ammonium sulfite,flue gas after secondary dehydration fog off the upper by desulfurization towerstraight row of chimneys.

2）Join the ammonia in thedesulfurization desulfurization tower (the project with more than 8%concentration of ammonia). With sulfur dioxide in flue gas after the reactionmass and heat transfer, the ammonium salt. And then achieve the goal oftreatment of sulfur dioxide.

NH₃ + H₂O== NH4OH

2NH₃ + H₂O+ SO2 == (NH₄)₂SO₃ + heat

(NH₄)²SO₃+ O₂ == (NH₄)SO₄

The chemical reaction is finished in 0.2 seconds, so thesize of the desulfurization tower is small, and the desulfurization efficiencycan be adjusted to more than 95%. The above reaction can adjust theconcentration of ammonia in the flue gas, so as to achieve the requireddesulfurization efficiency.

3）Nitrogen oxide (NO₂, NO) in flue gas can be removed byammonia containing wastewater, and NO can be oxidized to NO₂ in the flue gas,and NO₂ can easily be dissolved in water to become ammonium nitrate and nitricacid.

NH₃ + NO + NO₂+ H₂O == HNO₃ + HNO₂

When ammonia contacts with HNO₃ or HNO₂, the respond asfollows:

NH₃ + HNO₃== NH₄NO₃ + H₂O

NH₃ + HNO₂== NH₄NO2 + H₂O

In the liquid phase, (NH₄)₂SO3 as reductant and nitrogen oxides generates nitrogenfor chemical reaction：

2NO₂ + 4(NH₄)₂SO₃== 4(NH₄)2SO₄ + N₂↑

NO₂ + (NH₄)2SO3== (NH4)₂SO₄ + NO↑

2NO+ 2(NH₄)2SO3 == 2(NH4)2SO₄ + N₂↑