Built-in fixing method for SCR (Selective Catalytic Reduction) area type smoke mixer

Abstract

The invention provides a built-in fixing method for an SCR (Selective Catalytic Reduction) area type smoke mixer. The built-in fixing method ensures that the area type mixer is fixed safely and reliably. The method comprises the following steps that an SCR area type smoke mixer is arranged in one cross section area, perpendicular to the smoke flow direction, of a preset flue, the depth of the cross section of the SCR area type smoke mixer is A, the width of the cross section of the SCR area type smoke mixer is B, and B is larger than A; a plurality of mixer bodies are connected in series and fixed through an upper inner supporting rod and a lower inner supporting rod, the windward side of each inner supporting rod is provided with anti-abrasion angle steel, and a plurality of regional flue gas mixer assemblies are formed; b, flue reinforcing steel plates are welded to the inner wall faces of the two sides in the depth direction correspondingly, the flue reinforcing steel plates on the two sides are arranged in a one-to-one correspondence mode, and the ends, in the length direction, of the inner supporting rods of each set of regional flue gas mixing device are welded to the corresponding flue reinforcing steel plates correspondingly; the plurality of groups of regional flue gas mixing assemblies are arranged in a cross section area, and are sequentially arranged in the width direction.

Description

technical field [0001] The invention relates to the technical field of denitration equipment, in particular to a built-in fixing method for an SCR regional type smoke mixer. Background technique [0002] Under the background of ultra-low emission of SCR denitration and deep peak regulation in coal-fired power plants, in order to improve the adaptability of ammonia injection grills to different operating conditions, it is generally necessary to install regional flue gas mixers in the upper and downstream flues of ammonia injection grills , by strengthening the mixing of flue gas and flue gas, flue gas and ammonia gas in each area, improve the uniformity of the ammonia nitrogen molar ratio distribution in the upstream section of the first layer catalyst, and avoid the air preheater caused by the uneven distribution of NOx concentration and ammonia escape concentration at the SCR outlet. When the downstream equipment is blocked by ammonium bisulfate. The SCR regional flue gas ...

AI Technical Summary

Problems solved by technology

For example, install a reinforced steel plate with a thickness of about 8 mm at the corresponding position of the prop in the mixer to prevent deformation of the flue wall, but this method is not suitable for heavy mixers (up to 3 to 5 tons); or To install a ring of circumferential reinforcing ribs on the outer wall of the flue, the construction workload is large; or to add longitudinal reinforcing ribs (reinforced channel steel) at the fixed position of the outer and inner support rods of the flue, and the newly added longitudinal reinforcing ribs need to be fixed on the original two sides of the flue. Between the ring ribs.

[0004] Welding construction on the outer wall of the flue involves heavy construction workload, high cost, and harsh construction conditions; if it is necessary to dismantle and restore the original flue insulation, an additional construction platform is required, and some areas even have limited construction space.

In order to reduce the problems of heavy construction workload and high construction difficulty caused by setting reinforcement ribs on the outer wall of the conventional flue or reinforcing channel steel fixing schemes, a new fixing method is urgently needed

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