Pre-oxidation and wet catalysis combined desulfurization and denitrification system and method

Abstract

The invention provides a pre-oxidation and wet catalysis combined desulfurization and denitrification system and method. The pre-oxidation and wet catalysis combined desulfurization and denitrification system comprises a pre-oxidation system arranged on a flue, an absorption system arranged at an outlet of the flue, and a catalyst feeding system and a chimney which are connected with the absorption system respectively, wherein the front oxidation system comprises an H2O2 storage tank and an ultrasonic atomizer which are connected in sequence, and a compressed gas tank connected with an inlet of the ultrasonic atomizer; an outlet of the ultrasonic atomizer is connected into the flue; the absorption system comprises an absorption tower; the absorption tower adopts a wet spraying tower, and aslurry pool for containing alkaline absorption liquid is arranged at the bottom of the absorption tower; a flue gas inlet of the absorption tower is connected with a flue outlet which is connected with a chimney; the catalyst feeding system comprises a catalyst storage tank and a catalyst conveying pump; the catalyst storage tank is connected with the slurry pool through a catalyst conveying pump; and a catalyst for realizing synergistic removal of SO2 and NO2 in the alkaline absorption liquid is contained in the catalyst storage tank.

Description

technical field [0001] The invention relates to the field of flue gas purification for comprehensive treatment of waste gas in coal-fired power plants, sintering machines in steel plants, industrial boilers, biomass power plants, waste incineration plants, etc., specifically a pre-oxidation combined with wet catalytic combined desulfurization and denitration system and method. Background technique [0002] More than 95% of large coal-fired units in my country have achieved ultra-low emissions, but the treatment process is single, the operating cost is high, and there is an urgent need for transformation. Integrated removal and resource utilization are the direction of future development. Compared with the pollutant treatment in the power industry, the non-electric industry has a wide distribution of pollutant emissions, small flue gas volume, complex flue gas working conditions, and difficult governance. Integrated removal and low-temperature denitrification technologies hav...

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Problems solved by technology

[0005] But in H 2 o 2 In NO oxidation process, H 2 o 2 Oxidation of NO product to NO 2 , the compression atomization method is often used to oxidize NO by spraying it into the flue, and the oxidation efficiency of this process is low, generally less than 60%. 2 and NO 2 In process, NO 2 The absorption efficiency is only 10-20%, and the efficiency is low, which cannot meet the NOx emission requirements

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