A flue gas desulfurization and dust removal tower and desulfurization and dust removal method

Abstract

The invention discloses a flue gas dedusting and desulfurizing tower and a flue gas dedusting and desulfurizing method. The flue gas dusting and desulfurizing tower comprises a pretreatment unit, an advanced treatment unit and a tower bottom liquid tank area, and the pretreatment unit is communicated with the advanced treatment unit by a flue gas pipeline. The pretreatment unit sequentially comprises a quenching and spraying area, a first-stage spraying area and a Venturi grating washing area from top to bottom; and the advanced treatment unit sequentially comprises a middle liquid tank area,a second-stage spraying area, an upper liquid tank area, a third-stage spraying area, a demisting area and a flue gas discharging area from bottom to top. The white smoke phenomenon of wet desulfurization is eliminated, so the white smoke phenomenon of a smoke discharging opening is significantly reduced; and the triple functions of flue gas dedusting, desulfurizing and advanced demisting are achieved in the tower, and all functional areas cooperate with each other and promote each other, so the occupied area of the tower is greatly reduced, and the cost for construction and reconstruction ofthe tower is significantly reduced.

Description

technical field [0001] The invention belongs to the field of industrial waste gas purification, and relates to a flue gas desulfurization and dust removal tower and a desulfurization and dust removal method. Background technique [0002] Sulfur dioxide and dust are contained in boiler flue gas and flue gas emitted by factories. Sulfur dioxide and dust are the main components of air pollutants. one. [0003] Wet desulfurization has the advantages of high desulfurization rate, reliable device operation, and simple operation. Therefore, the existing flue gas desulfurization technologies in various countries in the world are mainly based on wet desulfurization. Traditional wet desulfurization technologies mainly include limestone-gypsum desulfurization, double alkali desulfurization, sodium alkali desulfurization, ammonia desulfurization and so on. The above-mentioned flue gas desulfurization technology mainly adopts countercurrent spraying. The alkaline slurry is sprayed from...

AI Technical Summary

Problems solved by technology

Existing wet desulfurization devices are difficult to meet the requirements of emission standards

[0006] With the large-scale promotion and application of wet desulfurization technology in my country, an obvious and insurmountable shortcoming of wet desulfurization technology has gradually emerged. The "white smoke long dragon" brings a strong visual impact to people, and sometimes there will be "dust rain" phenomenon on the ground

In addition, a large amount of water vapor is directly discharged into the atmosphere from the chimney, causing a waste of water resources

The main component of "white smoke" is water vapor, and there are two main sources: one is the low efficiency of the demister of the flue gas desulfurization device, and small water droplets (that is, supersaturated water) are still carried in the demisted flue gas; two After the high-temperature flue gas is discharged, the temperature decreases, resulting in a decrease in the saturated water carried by the flue gas, and the water vapor precipitates and condenses into small water droplets to form "white smoke"

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