Venturi tube bundle type dust and mist eliminator

Abstract

The invention relates to the technical field of flue gas dust and mist elimination, and in particular relates to a venturi tube bundle type dust and mist eliminator comprising a venturi tube, single fluid spray lances, a centrifuge, an expansion chamber and a drain board, wherein the bottom of the venturi tube is mounted on a circular hole of the drain board; a number of single fluid spray lances are arranged on the outer wall of a contraction section of the lower end of the venturi tube, and the centrifuge is arranged at the upper end of the venturi tube; and the expansion chamber is arranged at the upper part of the centrifuge. According to the invention, the single fluid spray lances are arranged at the reduced section of the venturi tube, so that water mist ejected by the single fluid spray lances is changed into fine droplets through the venturi effect, and then fine dust and gypsum droplets having a grain size below 20mu m (in particular PM2.5) can be eliminated, so that the effect of dust and mist elimination is improved. A dust-containing liquid is separated by the centrifuge and then enters the expansion chamber without contact with ascending gas, thereby avoiding secondary gas-liquid entrainment and further improving the effect of dust and mist elimination.

Description

Technical field [0001] The invention relates to the technical field of flue gas dust removal and mist removal, in particular to a venturi tube bundle type dust removal and mist eliminator. Background technique [0002] At present, the ultra-low emission of flue gas pollutants from coal-fired power plants mainly involves the emission of NOx, SO2 and soot. The difficulty at this stage is how to achieve efficient dust removal. The desulfurization process of coal-fired power plants in my country generally adopts limestone-gypsum wet desulfurization process, and a mist eliminator is installed on the upper part of the desulfurization tower to remove mist and dust. At this stage, the use of the flue gas collaborative treatment technology route to achieve ultra-low dust emission of 5mg / Nm3 has become more and more mainstream. The key to the success of this technology route to achieve ultra-low dust emission is that the wet desulfurization tower needs to have a strong collaborative dust r...

AI Technical Summary

Problems solved by technology

The conventional one-stage tube type + three-stage ridge type demister is a mechanical demister, which removes dust and mist droplets based on the inertial collision theory. The removal efficiency of gypsum droplets is greater than 99%, but the removal efficiency of dust and gypsum droplets with a particle size below 20 μm is low, making it inevitable that a large amount of fine dust and gypsum droplets will be carried in the flue gas at the outlet of the desulfurization tower, which will easily cause chimney gypsum rain Phenomenon

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