Demisting method and device based on rotary screen drum

Abstract

The invention discloses a demisting method and a demisting device based on a rotary screen drum. The demisting device comprises a screen drum demisting system at the top of a desulfurizing tower and an automatic rotation control system for controlling the rotation speed of a screen drum demister. Flue gas flow is entrained and sucked into the screen drum demister by the rotating screen drum demister, and the demisting and dedusting efficiency of the flue gas is effectively improved under the dual effects of inertia separation and centrifugal separation. When the operation condition of the desulfurization system changes, the rotating speed of the worm gear mechanism is adjusted to adjust the rotating angle of the screen drum demister to adapt to different smoke flowing conditions. And the screen drum demister is flushed through the annular flushing water demisting system and the scraper. The device combines inertia separation, centrifugal separation and coagulation dust removal, adopts a worm gear mechanism to realize surface cleaning of the screen drum under all working conditions, has the characteristics of high demisting and dust removal efficiency, small flue gas flow resistance, small flushing water amount, no dead angle, low energy consumption, wide working condition adaptability and the like, and can effectively reduce the formation of gypsum rain.

Description

technical field [0001] The invention relates to a demister in a desulfurization process, in particular to a method and device for demistering based on a rotating screen cylinder. Background technique [0002] Wet limestone / gypsum flue gas desulfurization system is widely used in thermal power plants. Mist eliminator is an important equipment in wet limestone / gypsum flue gas desulfurization system. The demister is used to remove a large number of fine particles and small droplets carried in the wet flue gas after desulfurization, to avoid corrosion of downstream equipment and the formation of gypsum scale, and to prevent the heat exchange effect of the flue gas reheater from being affected, and to avoid the formation of " Gypsum rain" pollutes the surrounding air environment. Improving the mist removal efficiency of the mist eliminator is one of the hot topics at present. [0003] The mist eliminator is generally arranged at the top of the desulfurization tower or at the o...

AI Technical Summary

Problems solved by technology

The baffle type mist eliminator uses the collision between the liquid droplets and the solid surface to condense and separate the droplets, so it is difficult to remove the fine liquid droplets in the flue gas; the tube type mist eliminator uses inertial collision and direct interception To achieve the purpose of demisting, it has a significant effect on removing droplets with a particle size of more than 400 μm, but the demisting effect on fine droplets is still not good; the swirling plate demister uses the swirling centrifugal force generated when the flue gas flows to separate the droplets and Solid particles are separated, but it is greatly affected by the flue gas flow rate, and it is difficult to remove fine droplets in the flue gas

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