A flue gas purification method and purification device

Abstract

The invention relates to a smoke purification method and a smoke purification device. The method comprises the steps of: (1) smoke pretreatment step: adding an oxidant into low-temperature smoke of a preheater to convert NOx and SO2 in the smoke into water-soluble high-valence compounds; (2) smoke spraying and waste liquid collecting step: mixing the high-valence compounds with water to form high-valence compound waste liquid; and (3) biological denitration step: adding bacteria into the waste liquid to react with the high-valence compounds in the waste liquid to obtain bacterial derivatives. According to the method and the device, the NOx and the SO2 in the smoke are converted into the bacterial derivatives by the oxidation and biochemical treatment so as to obviate emission of greenhouse gas and the catalyst escape in the whole process, thereby obviating the secondary pollution. The high-valence compounds are extremely easy to dissolve in the water to produce acidic waste liquid, so that harmful substances in the smoke can be removed effectively, so that the relatively high smoke purification efficiency can be obtained.

Description

technical field [0001] The invention relates to a flue gas treatment device, in particular to a flue gas purification method and a flue gas purification device which can be used for denitrification, desulfurization and decarbonization. Background technique [0002] The flue gas emitted by cement plants, power plants, iron and steel enterprises, and urban heating systems that use coal, fuel oil, and biomass fuels as fuels contains high concentrations of nitrogen, sulfur, and carbon oxides (NO x , SO 2 ), neither meet the increasingly stringent environmental requirements, but also cause direct harm to the ecological environment and human health. Therefore, the most effective way to control the emission of harmful substances is to treat the flue gas generated after fuel combustion in an appropriate way. [0003] NO x For example, currently commonly used flue gas denitrification treatment methods mainly include oxidation and reduction methods, the purpose of which is to remove...

AI Technical Summary

Problems solved by technology

The disadvantage is that when ammonia water is used, there will be ammonia escape, causing secondary pollution; when urea is used, CO will increase 2 emissions; the denitrification efficiency of these two methods is relatively low, and the operating cost is relatively high

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