A flue gas scr denitrification method and device

Abstract

The invention discloses a flue gas SCR denitrification method and device, which comprises a boiler, a smoke exhaust pipe, a filter, a mixing mechanism, an ammonia addition system, a detection component, a catalyst component and a collection mechanism, and filters out air and gas discharged from the top of the boiler. After the particulate impurities in the mixed flue gas are removed, combined with the ammonia gas output from the detection component, it is spirally mixed with the sprayed ammonia gas, and then the mixed gas passes through the stepped first catalyst layer, the second catalyst layer, and the second catalyst layer. The catalyst layer and the third catalyst layer, combined with the reaction temperature of the heater, carry out the denitrification reaction, and finally use the drainage method to collect the water-insoluble gas after dust removal, and discharge it after passing through the lime water in the reaction tank. The first catalyst layer 1. The sizes of the second catalyst layer and the third catalyst layer are enlarged sequentially, the contact area and time are increased, the catalytic reaction temperature is ensured, and the denitrification efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a flue gas SCR denitrification method and device. Background technique [0002] Nitrogen oxides are one of the main sources of air pollution. 70% of my country's nitrogen oxide emissions come from the direct combustion of coal, and the power industry is a large coal-burning household in my country, so thermal power plants have become one of the main sources of nitrogen oxide pollution. With the further improvement of environmental protection standards, large-scale and medium-sized thermal power plants across the country have implemented large-scale denitrification projects, and denitrification has become one of the key funding directions for energy-saving and environmental protection industries. There are three main denitrification technologies currently in use, among which Selective Catalytic Reduction (SCR) is the most advanced and most efficient den...

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Problems solved by technology

[0003] The principle of SCR denitrification is: using liquid ammonia, ammonia water or urea as the reducing agent, liquid ammonia, ammonia water or urea evaporates ammonia gas through pyrolysis, dilutes it with air through the static mixing mechanism, and sprays the flue gas through the ammonia spray grid Pipeline, the diluted flue gas is fully mixed with ammonia, and nitrogen and water are generated under the action of a catalyst, but the efficiency of traditional SCR denitrification is low

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