Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device

Abstract

The invention provides a rectification grille for protecting fly ash particles on a catalyst layer of an SCR (Semiconductor Control Rectifier) denitration device, belonging to the technical field of selective catalytic reduction and denitration. The rectification grille comprises cuboid grille units and a grille supporting beam, wherein the rectification grille is located at a position 5mm-10mm away from an upper surface of the catalyst layer, and consists of a plurality of cuboid grille units, each cuboid grille unit consists of a plurality of longitudinally and transversely vertical steel plates and four L-shaped angle irons, and the L-shaped angle irons are fixed to joints of the steel plates; and the rectification grille is fixedly supported on a wall surface of a flue of an SCR denitration system through the grille supporting beam. According to the invention, flue gases with a certain included angle with the vertical circulation direction before entering the rectification grille are subjected to gas-gas turbulent dissipation and gas-solid collision in each cuboid grille unit of the rectification grille, and the flue gases out of the rectification grille substantially flow downwards vertically, so that the catalyst wall surface at the lower side is prevented from being washed and eroded by solid particles, and thereby the catalyst blockage and inactivation are avoided.

Description

technical field [0001] The invention relates to a device in the technical field of selective catalytic reduction (SCR) denitrification, in particular to a rectifying grid used for protecting fly ash particles in a catalyst layer of an SCR denitrification device. Background technique [0002] Flue gas denitration methods include selective catalytic reduction (SCR) technology, selective non-catalytic reduction (SNCR) technology, SNCR / SCR combined flue gas denitrification technology, as well as liquid absorption method, microbial absorption method, activated carbon adsorption method, electron beam method, etc. . At present, the most widely used and most effective flue gas denitrification mainstream technology is SCR technology, and its denitrification efficiency is above 80%. The main principle of the selective catalytic reduction method is to use ammonia (NH 3 ) as a reducing agent and nitrogen oxides (NO x ) redox reaction occurs under the action of the catalyst to generat...

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Problems solved by technology

However, this paper did not improve the optimal design of the parameters of the rectifying grid from the perspective of protecting the catalyst layer, especially the influence of the height and installation position of the rectifying grid on the direction distribution of the flue gas velocity vector above the catalyst layer based on the flow field distribution and the There is no CFD quantitative calculation of the erosion of the catalyst layer by the flue gas fly ash particles passing through the rectification grid

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