Gas flow uniform-distributing device for selective catalytic reduction (SCR) denitration

Abstract

The invention relates to a gas flow uniform-distributing device for selective catalytic reduction (SCR) denitration. The gas flow uniformly-distributing device comprises a mixer in an SCR denitration device, is connected to the front part of the mixer in the SCR denitration device, and comprises a shell, wherein flanges are arranged at the two ends of the shell; the flanges at the two ends are respectively connected with a flue at the front part and the mixer in the SCR denitration device at the rear part; a front-stage porous uniform-distributing plate and a rear-stage multitube uniform distributor are fixed inside the shell along the axial direction; the front-stage porous uniform-distributing plate is a steel plate, in which a plurality of circular holes or square holes are formed; and the rear-stage multitube uniform distributor is a tubular passage which is formed through arranging and combining a plurality of steel tubes. Biased gas flow introduced from the flue at the front part firstly passes through the front-stage porous uniform-distributing plate; the flow velocity of gas flow of the cross section is uniformly distributed; after the gas flow passes through the rear-stage multitube uniform distributor, the direction of vector of the flow direction is adjusted to be parallel to the geometric axial direction of the mixer; and flue gas is fully and efficiently mixed with a reactant sprayed from a spray nozzle arranged in the mixer in the SCR denitration device, and thus the efficiency of subsequent catalytic reaction is increased.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering SCR method denitrification, and in particular relates to a selective catalytic reduction (SCR) denitrification gas flow uniform distribution device. Background technique [0002] Metallurgy, electric power and other industrial furnaces produce a large amount of industrial flue gas during production and operation, which contains a large amount of nitrogen oxide (NOx) gas. At present, the main methods for removing NOx in industry include low-nitrogen combustion, non-selective catalytic reduction (SNCR) and selective catalytic reduction (SCR). Among them, the SCR method has high denitrification reaction efficiency (above 90%) and stable operation, and is the most commonly used denitrification process. The basic principle of SCR denitrification is: using a reducing agent such as ammonia or urea to selectively reduce NOx (NO, NO2) in the exhaust gas through the action of a catalyst a...

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Problems solved by technology

[0004] Because the smoke from the kiln enters the denitrification device, due to the change of the direction of the flue, there will be obvious drift phenomenon, and some of the existing SCR mixers are not equipped with air distribution devices or only have simple devices. During the ammonia injection mixing time, it is impossible to ensure that the air flow is evenly distributed and fully mixed with the reactants, resulting in low efficiency of subsequent catalytic reactions

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