Demisting and dedusting device for wet chimney of coal-fired power plant

Abstract

The invention discloses a demisting and dedusting device for a wet chimney of a coal-fired power plant. The demisting and dedusting device comprises, from bottom to top, a gravity hammer, a lower supporting structure, an eddy current distributor, a connecting rod, an eddy current demister, an upper supporting structure and a nozzle, wherein the eddy current distributor is composed of a group of concentric blades and is fixed on the lower supporting structure through bolts, and the lower supporting structure is fixed below the connecting rod through bolts; the eddy current demister is located above the eddy current distributor and is fixed below the lower supporting structure through bolts; the eddy current demister is also composed of a group of concentric blades which are oppositely arranged relative to the blades of the eddy current distributor, so the rotation directions of air flows formed by the blades of the eddy current demister and the eddy current distributor are opposite; and the connecting rod is fixed below the upper supporting structure through bolts, and the upper supporting structure is fixed on the top of the inner wall of the chimney through a detachable fixing device. The demisting and dedusting device has the following beneficial effects: high demisting efficiency, small operation resistance, small flow obstruction effect on flue gas, low energy consumption, convenience in installation and easiness in operation and maintenance.

Description

technical field [0001] The invention belongs to a fog and dust removal device, and more specifically relates to a fog and dust removal device for a wet chimney of a coal-fired power plant. Background technique [0002] At present, more than 90% of the flue gas desulfurization devices of large-scale coal-fired power plants in China adopt the limestone-gypsum wet desulfurization process, and the wet flue gas after desulfurization contains SO 2 , SO 3 , HCl and other strong acidic substances. After desulfurization, the flue gas temperature is below the acid dew point, and the chimney at this time is called a "wet chimney". The flue gas in the wet chimney tends to produce corrosive sulfuric acid, sulfurous acid and hydrochloric acid. For a desulfurization system without a flue gas heat exchanger, the temperature of the flue gas is lower, and the condensed acid liquid in the flue gas is taken out of the chimney in the form of small mist with the flue gas discharge, and is scat...

AI Technical Summary

Problems solved by technology

[0003] At present, the chimneys of large coal-fired power plants have large diameters and high heights. Traditional demisting devices are not only difficult to install, but also very troublesome to operate and maintain, and consume high energy consumption.

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