Normal-temperature gas-phase catalytic oxidation-absorption reduction two-stage type flue gas denitrification process

Abstract

The invention relates to the field of the flue gas purification treatment technology and in particular relates to a normal-temperature gas-phase catalytic oxidation-absorption reduction two-stage type flue gas denitrification process. The process can improve the oxidization degree of nitric oxide and can effectively remove nitrogen oxides under low power consumption. The normal-temperature gas-phase catalytic oxidation-absorption reduction two-stage type flue gas denitrification process comprises the following steps: (1) flue gas enters an oxidation tower after being desulfurized and dedusted; (2) NO in flue gas is subjected to plasma facilitated or enhanced gas phase catalytic oxidation at normal temperature to generate high-valence nitrogen oxide; (3) high-valence nitrogen oxide enters an absorption reduction tower along with flue gas, and reducing agent solution is sprayed into the absorption reduction tower to absorb and reduce the high-valence nitrogen oxide to generate nitrogen gas, carbon dioxide, water or sulphate; and (4) flue gas after nitrogen oxide removal is discharged.

Description

technical field [0001] The invention relates to the technical field of flue gas purification treatment, in particular to a two-stage flue gas denitrification process of normal temperature gas-phase catalytic oxidation-absorption reduction. Background technique [0002] There are two kinds of denitrification technologies that are relatively mature in China: Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR). The marine denitrification technology has selective catalytic reduction (SCR). [0003] SCR denitrification technology means that under the action of a catalyst and at a certain temperature, the nitrogen oxides in the flue gas selectively react with the reducing agent to generate nitrogen and water to achieve the purpose of removing nitrogen oxides. In the SCR denitrification technology, in view of the influence of the sulfur oxide content in the flue gas on the catalyst, it is usually selected to inject a reducing agent at the reaction temp...

AI Technical Summary

Problems solved by technology

This technology does not use a catalyst, so this method is called Selective Non-Catalytic Reduction (SNCR), but the denitrification efficiency of SNCR is only about 50%, and this technology is basically not used in ship denitrification

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