A flue gas purification method and purification device

A flue gas purification and flue gas technology, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of high operating cost, low denitration efficiency, escape and other problems, achieve high flue gas purification efficiency and reduce costs Effect

CN102989280BInactive Publication Date: 2015-09-02高玉宗 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-09-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0028] The present invention will be described below in conjunction with the accompanying drawings.

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] Taking the denitrification process as an example, the flue gas purification method of the present invention mainly includes flue gas pretreatment links, flue gas spraying and waste liquid collection links, biological denitrification links, and wastewater treatment and purification utilization links.

[0031] 1) In the flue gas pretreatment process, an oxidant, such as potassium permanganate, is added to the low-temperature flue gas of the preheater to make NO in the flue gas x conversion into high-valent nitrogen compo...