SCR denitrification ammonification and flow field homogeneous structure and operating method thereof

Abstract

The invention provides an SCR denitrification ammonification and flow field homogeneous structure and an operating method thereof. The structure has the advantages of high mixing uniformity between ammonia gas and flue gas, reasonable flow field, low local resistance and simple configuration. Ammonification pipe series are fixed in a linear-segment flue; the ammonification pipe series are provided with ammonification holes; the outer bend of the bend flue is composed of an outer-chamfer plate; the inner bend of the bend flue is composed of an inner arc plate; a front guide plate is fixed in the bend flue; a back guide plate is fixed to the inside of an inlet of a reactor; and a rectifier unit module is fixed in the reactor. Ammonia gas is quickly ejected via the ammonification holes of the ammonification pipe series, and is subjected to opposed-flow diffusion and taken away by the flue gas; ammonia molecules are further diffused under the barrier action of mixed flow plates of mixed flow assemblies, are divided to the two sides of the mixed flow plates at higher speed, are subjected to slow guiding after sufficient mixing, and finally, are uniformly dispersed in the flue gas; and the flue gas is adjusted and distributed uniformly by the rectifier unit module and reaches the catalyst on the first layer.

Description

technical field [0001] The invention relates to an SCR denitrification and ammonia addition, a uniform flow field structure and an operation method thereof. Background technique [0002] SCR flue gas denitrification technology is currently the most widely used and most mature and effective flue gas denitrification treatment technology in the world, as shown in the Chinese patent application number 201420182708.9; [0003] The main reaction steps of SCR flue gas denitrification technology are: NO in flue gas x and NH 3 Freely diffuse to the surface of the catalyst, thus entering the interior of the micropores, under the action of the catalyst, the NO in the flue gas x and NH 3 A reduction reaction occurs, and the N 2 and H 2 O is desorbed from the micropores of the catalyst, diffuses to the surface of the catalyst, and is emitted with the flue gas. The main factors affecting the denitrification efficiency of SCR are: ammonia nitrogen molar ratio, reaction time, reaction...

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Problems solved by technology

Long-term sick work will lead to a series of operational problems such as increased system resistance, increased catalyst wear, increased ammonia addition, and increased ammonia escape.

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