Device and method for dedusting and demisting after wet desulphurization

Abstract

The invention provides a device and a method for dedusting and demisting after wet desulphurization. The device comprises a shell, wherein a plurality of dedusting and demisting units are arranged inside the shell, each dedusting and demisting unit is internally provided with a two-stage dedusting and demisting structure, the dedusting and demisting structure comprises a vertical barrel, the vertical barrel is internally provided with a rotational flow device and an annular water supplementing ring arranged above the rotational flow device, the water supplementing ring is provided with a water spray hole, and discharge pipes are arranged on the periphery of the rotational flow device at the bottom of each dedusting device. The method and the structure of the device are simple; after the device is arranged on the top of a desulfuration tower, a large amount of liquid drops and dust particles in smoke are bumped each other and coagulated and enlarged due to high-speed movement; through centrifugal separation in the rotational flow device, the liquid drops and the dust are thrown to the inner wall; through the supplementing rings form water films on the inner wall so that the liquid drops and the dust are collected; and under the action of gravity, the liquid drops and the dust flow to a collecting tank along the inner wall, and are collected and then discharged.

Description

technical field [0001] The invention relates to a device for removing dust and fog after wet desulfurization and a method thereof. Background technique [0002] With the improvement of emission standards, with the improvement of my country's environmental protection standards, especially the introduction of the new "Emission Standards of Air Pollutants for Thermal Power Plants" in 2014, the particulate matter emission standards were raised to 30mg / m 3 , key areas require 20mg / m 3 . At present, the limestone-gypsum wet process is mostly used for boiler flue gas treatment. Although the flue gas before desulfurization has undergone dust removal treatment, the flue gas after desulfurization contains fine slurry, which causes secondary entrainment, resulting in export particles that do not meet the national standard. Traditional mechanical demisters cannot meet the requirements, resulting in excessive smoke emissions and affecting the environment. Contents of the invention ...

AI Technical Summary

Problems solved by technology

At present, most of the boiler flue gas treatment adopts limestone-gypsum wet process. Although the flue gas before desulfurization has undergone dust removal treatment, the flue gas after desulfurization contains fine slurry, which causes secondary entrainment, resulting in export particles that do not meet the national standard.

Traditional mechanical demisters cannot meet the requirements, resulting in excessive smoke emissions and affecting the environment

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