Normal-temperature flue gas denitration method

Abstract

The invention relates to a method used for processing nitrogen oxide in boiler flue gas, and specifically relates to a normal-temperature flue gas denitration method. The normal-temperature flue gas denitration method comprises following steps: 1) dedusting; 2) desulphurization; 3) plasma oxidation, wherein processed flue gas is delivered into a row electrode type double-dielectric barrier discharge plasma oxidation device for oxidation treatment; and 4) collection of oxidized substances in the flue gas via spraying the oxidized flue gas with an alkaline aqueous solution. Compared with traditional technology, the normal-temperature flue gas denitration method is capable of realizing large wind amount treatment, is high in denitration efficiency, and can be widely used for boilers of different types; and denitration efficiency can be more than 90% via controlling plasma row electrode control.

Description

technical field [0001] The invention relates to a method for treating nitrogen oxides in boiler flue gas, in particular to a normal temperature flue gas denitrification process. Background technique [0002] At present, the main denitrification processes are SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) technologies. By adding ammonia or ammonia water to the flue gas and controlling the reaction conditions, the nitrogen oxides and ammonia undergo a redox reaction to generate nitrogen to achieve the purpose of denitrification. [0003] The shortcomings of the above-mentioned denitrification process are: selective non-catalytic reduction method: the efficiency of nitrogen oxide removal by spraying ammonia in the furnace is low (30%-50%), ammonia escape is serious, and it is difficult to standardize emissions; selective catalytic reduction method uses Catalyst, the efficiency is relatively high and can reach 80% efficiency, but the investment...

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Problems solved by technology

[0003] The shortcomings of the above-mentioned denitrification process are: selective non-catalytic reduction method: the efficiency of nitrogen oxide removal by spraying ammonia in the furnace is low (30%-50%), ammonia escape is serious, and it is difficult to standardize emissions; selective catalytic reduction method uses Catalyst, the efficiency is relatively high and can reach 80% efficiency, but the investment is high, the catalyst layer needs to be replaced every 2-3 years, and the operating cost is high

In the prior art, as far as the applicant knows, there is no process and device that can be practically applied in industry

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