Ultra-low emission absorption tower

Abstract

The invention discloses an ultra-low emission absorption tower, which comprises an absorption tower body, a demister, spraying layers and a slurry trough, wherein the slurry trough is arranged at the bottom in the absorption tower body; the demister is arranged at the upper part in the absorption tower body; the spraying layers are arranged below the demister; a slurry distribution plate is arranged below the lowermost spraying layer; a slurry flow guide ring is arranged below each spraying layer; the demister consists of three groups of ridge-type demisters and a group of tubular demisters; the tubular type demisters are arranged below the lowermost layer of the ridge-type demisters; a condensation and coagulation system is arranged between the lowermost layer of the ridge-type demisters and the middle layer of the ridge-type demisters. The ultra-low emission absorption tower can be used for removing tiny dust with a small particle size from smoke of a power plant, so that the spraying coverage rate is effectively increased, the efficiency of removing SO2 and dust from the smoke is improved, and the inner wall of the absorption tower body can be effectively prevented from being abraded; in addition, smoke can be guided, so that smoke can flow to a spraying dense region to relieve pressure loss of the edge wall.

Description

technical field [0001] The invention relates to an absorption tower, in particular to an ultra-low emission absorption tower, which belongs to the field of environmental protection. Background technique [0002] The absorption tower is mainly used for flue gas desulfurization in coal-fired power plants and assists in dust removal. The absorption slurry is sprayed from top to bottom, and the flue gas flows from bottom to top in the absorption tower, so as to remove SO in the flue gas 2 and dust. [0003] The type selection and arrangement of nozzles on the spray layer directly affect the SO concentration in the flue gas. 2 and dust removal effect, most of the existing absorption towers use one-way nozzles, and the spray coverage is low. Due to the uneven distribution of the flue gas after entering the absorption tower, there will be local flue gas escape. [0004] The absorption tower absorbs the slurry and sprays from top to bottom, and the nozzles on the outermost circle...

AI Technical Summary

Problems solved by technology

This will easily lead to: on the one hand, the pressure loss at the side wall is relatively large; on the other hand, due to the spray arrangement structure, the concentration of the slurry near the tower wall is not as high as that in the center of the tower, which is not conducive to the SO in the flue gas. 2 and dust removal

[0006] Since the flue gas has been treated by dust removal and environmental protection facilities such as electrostatic precipitators or bag filters before entering the absorption tower, the particle size of the dust particles entering the absorption tower is mostly below 20 μm, and the particle size of the fine dust is small, resulting in low dust removal efficiency of the absorption tower, which cannot meet the requirements. 5mg / Nm for ultra-low emission requirements 3 emission requirements

Moreover, a demister flushing system is installed on the top of the absorption tower. The demister flushing system is flushed at least once every 8 hours, and the flushing time is more than 30 minutes. The emission concentration of fine dust seriously exceeds the standard in some periods

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