Device and method for purifying flue gases

Abstract

low-temperaturetes to the field of flue gas treatment and discloses a device and a method for purifying flue gases. The device for purifying the flue gases comprises an electrical precipitator (2), a low-temperature plasma reactor (4) and wet desulphurization equipment (6) which are connected in sequence, wherein an outlet of the electrical precipitator (2) is connected with an inlet of the low-temperature plasma reactor (4); an outlet of the low-temperature plasma reactor (4) is connected with an inlet of the wet desulphurization equipment (6). The method for purifying the flue gases comprises the following steps of introducing the flue gases containing dust and nitrogen oxide into the electrical precipitator (2) for performing dust removing treatment; enabling the flue gases subjected to the dust removing treatment to enter into the low-temperature plasma reactor for oxidation treatment; then introducing the flue gases formed by the oxidation treatment into the wet desulphurization equipment for absorption treatment. By adopting the device and the method disclosed by the invention, the oxidation and dust charging efficiency of nitric oxide is high; the device is not easy to wear and is good in purifying effect of the flue gases.

Description

technical field [0001] The invention relates to the field of flue gas treatment, in particular to a device and method for purifying flue gas. Background technique [0002] Flue gas is one of the main emissions of thermal power plants, which is produced by burning combustibles in burners (ie, boilers). Because flue gas usually contains a large amount of nitrogen oxides NO x Such as NO, if these nitrogen oxides are directly discharged into the atmosphere, it will cause highly corrosive acid rain, so the flue gas must be removed from the nitrogen oxides before being discharged. [0003] There are two main reaction pathways for the removal of nitrogen oxides in flue gas: nitrogen oxide reduction and nitric oxide (NO) oxidation, nitrogen dioxide (NO 2 )absorb. In the invention patent application with the publication number CN102059050A, a method for controlling flue gas composite pollutants is disclosed, in which a bipolar discharge device is used in conjunction with an electr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of low nitric oxide oxidation efficiency in the existing flue gas purification technology, and to provide a device and method for flue gas purification, which can efficiently oxidize nitric oxide in flue gas to carbon dioxide Nitrogen and strong charging of fine particulate matter smoke, and effective removal of nitrogen dioxide and residual smoke in downstream equipment

At the same time, due to the difficulty of bipolar discharge under high particle concentration, the oxidation efficiency of nitric oxide is low

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