A double-tower high-efficiency wet desulfurization device

Abstract

The invention discloses a double-tower efficient wet desulphurization device which comprises four subsystems including the SO2 absorption system, the slurry supply system, the oxidation air system and the gypsum dehydration system. The SO2 absorption system is composed of a primary desulphurization tower and a secondary desulphurization tower which are of the same structure, are connected in series and share a set of the slurry supply system and the oxidation air system, gypsum slurry in the secondary desulphurization tower is delivered into the primary desulphurization tower, and gypsum in the primary desulphurization tower is discharged out of the tower through the gypsum dehydration system. The double-tower efficient wet desulphurization device has the advantages of being high in desulphurization efficiency, wide in application range, stable in operation, convenient to maintain and overhaul and the like. Flue gas purified by the desulphurization device can meet the increasingly strict SO2 ultralow emission standard of China, and meanwhile waste oxidation air and the purified flue gas are isolated, so that the device is beneficial for improving the capturing efficiency of a follow-up CO2 purifying system.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a double-tower high-efficiency wet desulfurization device. Background technique [0002] With the rapid development of industry, atmospheric environmental problems such as acid rain have become increasingly prominent, seriously threatening human life, health and property safety. In recent years, the problem of acid rain has attracted great attention from the general public. National environmental protection regulations and policies have 2 The requirements for the emission limits of coal-fired power plants are becoming increasingly stringent. For example, the "Emission Standards for Air Pollutants from Thermal Power Plants" (GB13223-2011) further reduced the emission limits of air pollutants in coal-fired power plants. Among them, the key control areas require SO 2 Emission limit is 50mg / m 3 ; "Coal Power Energy Conservation and Emission Reduction Upgrading and Transf...

AI Technical Summary

Problems solved by technology

When the boiler adopts oxygen-enriched combustion, the CO in the combustion products 2 The content will reach more than 75% to 90%. If the waste oxidation air discharged from the slurry tank is mixed into the flue gas, the high concentration CO 2 gas stream dilution, will lead to subsequent CO 2 The capture efficiency of the purification system decreases

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