Sodium Alkali Spray Desulfurizer Tower Flue Gas Purification SO2

Sodium Alkali Spray Desulfurizer Tower Flue Gas Purification SO2

1. Brief introduction

Sodium Alkali Spray desulfurizer tower is widely applied in kiln flue gas purification in brick and tile industry. It uses alkali as solvent and could absorb acid gases like SO2, So3, HCl, etc.

The sodium alkali desulfurization process mainly consists of SO2 absorption system, absorbent system, and other components. The SO2 absorption system consists of a desulfurization tower, an internal spray system, a cyclone, a mist eliminator, an absorption liquid circulation pump, a supply pipeline, and other components.

2. Main technical parameters

3. The working principle

This method uses NaOH solvent to absorb the SO2 in the flue gas, the reaction equation as below:

2NaOH+SO2→Na2SO3+H2O (1)

Na2SO3+H2O+SO2→2NaHSO3 (2)

Notes:

a. Equation (1) represents the main reaction of SO2 absorption by the desulfurization solution during the start-up stage, when the NaOH solution absorbs SO2 and the pH value of the regeneration solution is high (above 8);

b. Equation (2) represents the main reaction when the pH value of the desulfurization solution is low (5-8).

c. As the absorption process going, the amount of Na2SO3 in the absorption solution increases, and the absorption capacity of the absorption solution decreases. It is necessary to add alkaline solution to the absorption solution, maintain a relatively stable concentration ratio of Na2SO3 in the absorption solution, and regularly discharge a portion of the waste liquid.

d. The acidic gases such as SO3 and HCl contained in the flue gas will also be absorbed by the absorbent.

4. The structure diagram of desulfurizer tower

5. Detail images: