Reduction and oxidation combined denitration system and denitration method thereof

Abstract

A reduction and oxidation combined denitration system comprises an SNCR denitration device, an SCR denitration device and an oxidation denitration device. The SNCR denitration device comprises a reducing agent storage device, a cyclone separator and a reducing agent jet device. The SCR denitration device comprises a reducing agent supplementation amount control device and a denitration catalyst layer. The denitration catalyst layer is arranged in the tail of a boiler flue gas pipeline. The oxidation denitration device is connected with the outlet of the boiler flue gas pipeline through a flue gas pipeline, and comprises an oxidization reaction device, a concentrate nitric acid absorption tower and an alkali liquor washing tower which are sequentially connected through flue gas pipelines. The oxidation denitration device conducts deep denitration processing on flue gas where denitration is conducted through the SNCR denitration device and the SCR denitration device. The invention further provides a method for conducting boiler flue gas denitration through the system; by means of the method, reduction denitration and oxidization denitration are combined, the denitration effect is better, and upgrading and reconstructing of an existing denitration system are facilitated.

Description

technical field [0001] The invention relates to a denitration technology and method, in particular to a reduction and oxidation combined denitration system and a denitration method thereof. Background technique [0002] Nitrogen oxides are the main pollutants that cause air pollution, commonly referred to as NO that pollutes the atmosphere X Mainly including NO and NO 2 . The air pollution problem of nitrogen oxides is becoming more and more serious. The harm to human health, high content of nitric acid rain, photochemical smog, reduction of ozone and other problems are all related to low concentration of nitrogen oxides. Industrial emissions of nitrogen oxides are the main source of air pollution heavy nitrogen oxides. [0003] Over the past 10 years, as my country's thermal power nitrogen oxide emissions have increased year by year, the level of nitrogen oxide emissions per unit of thermal power generation has far exceeded the level of developed countries. In the "Twel...

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Problems solved by technology

[0006] From the above, it can be seen that no matter whether SNCR technology or SCR technology is used for denitrification, the NO in the exhausted flue gas cannot be guaranteed. X The content is lower than the national standard, and the exhausted flue gas contains more fly ash, which is easy to pollute the atmosphere

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