Double-effect flue gas purification apparatus and purification method thereof

Abstract

The present invention relates to the technical fields of general waste gas purification methods and equipment or apparatuses specially designed for the methods, particularly to a double-effect flue gas treatment apparatus and a desulfurization method thereof. According to the present invention, a layer of slurry spraying pipes are arranged at the positions 0.8-1 m above a flue gas treatment apparatus inlet flue, the plurality of the slurry spraying pipes are uniformly arranged on a circular absorption zone plane in a side-by-side manner, a plurality of spraying nozzles are uniformly arranged on each slurry spraying pipe in a side-by-side manner while the enough installation space is ensured, and the distance between the adjacent slurry spraying pipes, the distance between the adjacent spraying nozzles and the distance between the spraying nozzle and the tower wall are subjected to distance adjusting according to different flue gas purification apparatus sizes and difference slurry spraying amounts; with the apparatus and the method, the latest and most stringent environmental requirement that the SO2 emission concentration is lower than 50 mg / Nm<3> when the sulfur content in the combustion coal is less than or equal to 2.5% can be met so as to fill the technical gap, and the latest and most stringent flue dust emission requirements can be met when the concentration of the flue dust at the flue gas treatment apparatus inlet is less than 80 mg / Nm<3>; and the operating cost of the whole system is low, security and stability are provided, and use range is wide.

Description

[technical field] [0001] The present invention relates to the general method for purifying exhaust gas and the technical field of equipment or devices specially designed for such methods, in particular to a double-effect flue gas purification device and its purification method. [Background technique] [0002] In recent years, the air pollution situation has become more and more serious. The severe smog phenomenon has brought a huge impact on the lives and work of people all over the country, and also cast a shadow on the country's economic development. Flue gas desulfurization technology, which is the main means of air pollutant emission control shouldered a huge responsibility. Although domestic flue gas desulfurization technology has been developed for more than ten years, and many desulfurization companies have introduced their own desulfurization technology, many unsolvable problems are still found in the actual application process, especially the latest 2011 edition of ...

AI Technical Summary

Problems solved by technology

For coal with high sulfur content, generally when the sulfur content is above 2.0%, the desulfurization efficiency needs to reach above 99%, and the spray tower cannot meet the requirements

At present, many domestic desulfurization projects have to limit the sulfur content of coal combustion due to the limitation of the desulfurization efficiency of the spray tower, which adds huge operating costs to the enterprise

[0005] 2. Although the spray tower adopts nozzles with an upper and lower spray angle of 90° near the tower wall, it is still impossible to prevent the slurry sprayed from the nozzle from scouring the tower wall, so that the anti-corrosion layer of the tower wall is easy to fall off, causing corrosion of the steel tower wall

At present, many domestic desulfurization projects located in areas where the special emission limits of air pollutants are implemented are facing the problem that the existing technical transformation cannot achieve SO 2 The emission concentration is lower than 50mg / Nm 3 And smoke emission concentration is lower than 20~30mg / Nm 3 Case

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