Device, system and method for deeply controlling multiple types of pollutants in boiler flue gas

Abstract

The invention provides a device, a system and a method for deeply controlling multiple types of pollutants in boiler flue gas. The device comprises a casing, wherein the interior of the casing is sequentially provided with a flue gas ammonia injection area, a plasma desulfurizing and denitrifying area, a dust charge coagulation area, a wet type electric dedusting and defogging area and a flue gasexhaust area from bottom to top; the system comprises the device for deeply controlling multiple types of pollutants in the boiler flue gas. The method comprises the following steps of denitrifying, dedusting, desulfurizing, and deep purifying. The device, the system and the method provided by the invention have the advantages that the original technology using the single technique to treat the single pollutant is replaced by the technology and device for high-efficiency synergistic removal of multiple types of pollutants, so as to realize the effect of integrated deep removal by dedusting, desulfurizing and denitrifying; the technology process is simplified, and the purifying efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a deep treatment device, system and method for multiple pollutants in boiler flue gas. Background technique [0002] In the past ten years, my country has invested hundreds of billions of yuan in large-scale flue gas desulfurization treatment, and has continuously upgraded dust collectors and denitrification and desulfurization processes. Great efforts have been made, and corresponding results have been achieved. The direct emission value of smoke and dust has also dropped significantly, but in terms of external performance, "the number of blue skies in my country has not increased but decreased", and atmospheric environmental problems such as smog are still very serious. The causes of smog are complex. As far as the impact of coal-fired flue gas emissions is concerned, the emission substances that affect the formation of smog are not a single dust, SO 2 O...

AI Technical Summary

Problems solved by technology

However, due to the improvement of environmental protection requirements for heavy metal Hg, PM2.5 and waste water, if only a single device is used to clean up the flue gas of coal-fired boilers one by one, the emission of pollutants is still too high (that is, soot ≤ 30mg / Nm 3 , sulfur dioxide ≤ 100mg / Nm 3 , Nitrogen oxide≤100mg / Nm 3 ); If you want to further reduce the discharge of various pollutants on this basis, the cost of improving a single process is very high

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