SCR (Selective Catalytic Reduction) flue ammonia spraying turbulence mechanism

Abstract

The utility model discloses an SCR flue ammonia injection turbulent flow mechanism, including SCR flue, ammonia water spray gun and turbulent flow device, the SCR flue inlet is connected with the boiler outlet, the ammonia water spray gun is arranged in the SCR flue, the turbulent flow device is arranged in the flue gas downstream direction of the ammonia water spray gun, the spraying direction of the ammonia water spray gun is consistent with the flue gas flow direction, and the turbulent flow device is arranged in the flue gas downstream direction of the ammonia water spray gun. The turbulent flow device comprises more than two rows of turbulent flow pipes, the turbulent flow pipes in adjacent rows are arranged in a staggered mode, the turbulent flow pipes in each row are arranged at equal intervals, the turbulent flow pipes are vertically arranged in the SCR flue, and a plurality of layers of irregular blades are arranged on the turbulent flow pipes in the vertical direction. The multiple layers of turbulent flow pipes are arranged at the downstream of the ammonia water spray gun, so that flue gas can be effectively and uniformly distributed; multiple layers of irregular blades are welded to the side face of the turbulence pipe, the breakage rate of ammonia water is increased, and the atomization effect of ammonia water is enhanced; compared with an existing ammonia spraying grid, the distance between the turbulent flow pipe and the ammonia water spraying gun is lengthened, and it is guaranteed that ammonia water and flue gas are evenly mixed.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR denitration reactors, in particular to the technical field of ammonia injection turbulent flow mechanisms. Background Art

[0002] The flue gas denitrification of boilers and industrial kilns mainly adopts the selective catalytic reduction method (SCR) and the non-catalytic reduction method (SNCR). SCR denitrification has the characteristics of high denitrification efficiency, high safety and wide application. In the SCR denitrification system, the ammonia injection device has a great influence on the denitrification efficiency.

[0003] In the prior art, conventional boiler outlet ammonia injection flue is not equipped with turbulent flow devices or only equipped with conventional ammonia injection grids for turbulent flow. When ammonia water is injected into the flue before the SCR reactor, it is not evenly mixed with the flue gas, resulting in excessive ammonia injection and excessive ammonia escape at the outlet of the SCR denitrification device. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art and to provide an SCR flue ammonia injection turbulent flow mechanism which can solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model proposes an SCR flue ammonia spraying turbulence mechanism, comprising an SCR flue, an ammonia spray gun and a turbulence device, wherein the SCR flue inlet is connected to the boiler outlet, an ammonia spray gun is arranged in the SCR flue, the turbulence device is arranged in the flue gas downstream direction of the ammonia spray gun, the spraying direction of the ammonia spray gun is consistent with the flue gas flow direction, the turbulence device comprises more than two rows of turbulence tubes, the turbulence tubes in adjacent rows are staggered, the turbulence tubes in each row are arranged at equal intervals, the turbulence tubes are vertically arranged in the SCR flue, and the turbulence tubes are provided with a plurality of layers of irregular blades in the vertical direction.

[0006] Preferably, the ammonia spray gun is arranged on the central axis of the SCR flue.

[0007] Preferably, the distance between the turbulent flow device and the ammonia spray gun is 4-6 meters.

[0008] Preferably, the irregular blades are three-leaf blades.

[0009] Preferably, the turbulence pipe is a seamless steel pipe.

[0010] The beneficial effects of the utility model are as follows: the utility model arranges a multi-layer turbulence tube downstream of the ammonia spray gun, and the multi-layer turbulence tubes are arranged in staggered and equal intervals, which can effectively distribute the flue gas; a multi-layer irregular blade is welded on the side of the turbulence tube to improve the crushing rate of the ammonia water and enhance the atomization effect of the ammonia water; compared with the existing ammonia spray grid, the distance between the turbulence tube and the ammonia spray gun is lengthened to ensure that the ammonia water and the flue gas are evenly mixed.

[0011] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 yes Figure 1 Middle A-direction view;

[0014] Figure 3 yes Figure 2 Center B view.

[0015] In the figure: 1-SCR flue, 2-ammonia spray gun, 3-turbulence pipe, 4-irregular blades. DETAILED DESCRIPTION

[0016] See also Figure 1 , Figure 2 , Figure 3 , SCR flue ammonia spraying turbulence mechanism: includes an SCR flue 1, an ammonia spray gun 2 and a turbulence device, the inlet of the SCR flue 1 is connected to the boiler outlet, the SCR flue 1 is provided with an ammonia spray gun 2, the turbulence device is arranged in the flue gas downstream direction of the ammonia spray gun 2, the spraying direction of the ammonia spray gun 2 is consistent with the flue gas flow direction, the turbulence device includes two rows of turbulence tubes 3, the first row and the second row of turbulence tubes 3 are staggered, and the turbulence tubes 3 in each row are arranged at equal intervals, the turbulence tubes 3 are vertically arranged in the SCR flue 1, and the turbulence tubes 3 are provided with several layers of three-leaf irregular blades 4 in the vertical direction, the ammonia spray gun 2 is arranged on the central axis of the SCR flue 1, the distance between the turbulence device and the ammonia spray gun 2 is 5 meters, and the turbulence tube 3 is a seamless steel pipe.

[0017] The utility model arranges double-layer staggered turbulent flow tubes at the ammonia spraying flue at the inlet of the SCR denitrification device, so that the flue gas and ammonia water are evenly mixed. The setting of the three-leaf irregular blades makes the collision of ammonia water more intense and the ammonia water atomization better, thus solving the problem of excessive ammonia spraying and excessive ammonia escape in the SCR denitrification.

[0018] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A turbulent flow mechanism for injecting ammonia into a SCR flue, characterized by: The invention comprises an SCR flue (1), an ammonia spray gun (2) and a turbulence device, wherein the inlet of the SCR flue (1) is connected to the outlet of the boiler, the ammonia spray gun (2) is arranged in the SCR flue (1), the turbulence device is arranged in the flue gas downstream direction of the ammonia spray gun (2), the spraying direction of the ammonia spray gun (2) is consistent with the flue gas flow direction, the turbulence device comprises more than two rows of turbulence pipes (3), the turbulence pipes (3) in adjacent rows are arranged in a staggered manner, the turbulence pipes (3) in each row are arranged at equal intervals, the turbulence pipes (3) are vertically arranged in the SCR flue (1), and the turbulence pipes (3) are provided with a plurality of layers of irregular blades (4) in the vertical direction.

2. The SCR flue ammonia injection turbulence mechanism according to claim 1, characterized in that: The ammonia water spray gun (2) is arranged on the central axis of the SCR flue (1).

3. The SCR flue ammonia injection turbulence mechanism according to claim 1, characterized in that: The distance between the turbulent flow device and the ammonia spray gun (2) is 4-6 meters.

4. The SCR flue ammonia injection turbulence mechanism according to claim 1, characterized in that: The irregular blades (4) are three-leaf blades.

5. The SCR flue ammonia injection turbulence mechanism according to claim 1, characterized in that: The turbulence pipe (3) is a seamless steel pipe.

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