Flue Gas Purification Desulfurizer Tower Spray Type

Flue Gas Purification Desulfurizer Tower Spray Type

1. Brief introduction

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

The kiln's flue gas enters the desulfurization tower in a tangential direction, and the small smoke and dust in the flue gas are soaked and collided with each other to form particles. Under the action of centrifugal force, they are thrown onto the tower wall and washed down to the bottom of the tower under the action of a water film; The flue gas rotates upwards along the tower wall and collides with the atomized desulfurization liquid at high speed through a swirling layer. At this time, the gas, liquid, and solid three-phase flow are fully in contact, and the SO2 in the flue gas is greatly absorbed by the alkaline components in the liquid, fully purifying the flue gas. The purified flue gas is dehydrated by a mist eliminator and discharged from the chimney to meet the standards.

The waste liquid after desulfurization is discharged from the bottom of the tower to the ash flushing ditch. After sedimentation in the sedimentation tank (with a small amount of dust in the flue gas), the clarified liquid is further sent to the tower body by the desulfurization pump for recycling. A small amount of wastewater is discharged from the desulfurization system; after a period of time, the sedimentation in the circulating pool is manually or mechanically cleaned.

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

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.

5. Detail images: