SCR (Selective Catalytic Reduction) reversely-arranged mixing flue of ejection boiler

Abstract

The utility model discloses an ejection boiler SCR reverse arrangement mixing flue which comprises an inlet flue, a horizontal flue and an outlet flue which are sequentially connected, the horizontal flue is arranged at the top of an SCR reactor, the inlet flue is connected with a boiler outlet, the outlet flue is connected with an SCR reactor inlet, the boiler outlet is arranged at the top of a boiler, and the horizontal flue is arranged at the top of the SCR reactor. The SCR reactor inlet is formed in the side, away from the boiler, of the SCR reactor, and an ammonia water spray gun is arranged in the inlet flue and arranged in the flue gas direction. The flue is ejected out of the boiler, and the SCR inlet flue is reversely arranged, so that the length of the ammonia spraying and mixing flue is prolonged, full evaporation of ammonia water and uniform mixing of flue gas are guaranteed, and the problem that the arrangement site of the boiler and the SCR reactor is narrow is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR denitration reactors, in particular to the technical field of reversely arranged mixed flues of ejection boiler SCRs. Background Art

[0002] The importance of removing nitrogen oxides from combustion flue gas and preventing environmental pollution has been sharply raised as a worldwide issue. The more mainstream processes in the world are divided into: SCR and SNCR. SCR is the most mature flue gas denitrification technology, which is a post-furnace denitrification.

[0003] In the prior art, the conventional boiler outlet flue adopts a side outlet and is connected along the inlet direction of the SCR reactor. A long horizontal flue is set at the SCR inlet to ensure the full evaporation of ammonia water and the uniform mixing of flue gas. This structure results in a long arrangement distance between the boiler and the SCR reactor, and occupies a large area. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art and to propose a reversely arranged mixing flue of a top-out boiler SCR, which can solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model proposes a reversely arranged mixing flue of a top-out boiler SCR, comprising an inlet flue, a horizontal flue and an outlet flue connected in sequence, wherein the horizontal flue is arranged at the top of the SCR reactor, the inlet flue is connected to the boiler outlet, the outlet flue is connected to the SCR reactor inlet, the boiler outlet is arranged at the top of the boiler, the SCR reactor inlet is arranged at a side of the SCR reactor away from the boiler, an ammonia spray gun is arranged in the inlet flue, and the ammonia spray gun is arranged along the flue gas direction.

[0006] Preferably, the inlet flue is connected to a first elbow, the first elbow is connected to a first flue expansion joint, the first flue expansion joint is connected to a horizontal flue, the two ends of the outlet flue are respectively connected to a second elbow and a third elbow, the second elbow is connected to the horizontal flue, the third elbow is connected to a second flue expansion joint, and the second flue expansion joint is connected to the inlet of the SCR reactor.

[0007] Preferably, guide plates are provided in the second elbow and the third elbow.

[0008] Preferably, the inlet flue and the outlet flue are both arranged vertically.

[0009] Preferably, two layers of staggered turbulence tubes are provided in the horizontal flue.

[0010] Preferably, the ammonia outlet of the ammonia spray gun is arranged at the center of the flue.

[0011] Beneficial effects of the utility model: the flue of the utility model is discharged from the top of the boiler, and the SCR inlet flue is arranged in the reverse direction, which extends the length of the ammonia spray mixing flue, ensures the full evaporation of ammonia water and the uniform mixing of the flue gas, and solves the problem of the narrow layout space of the boiler and the SCR reactor; the ammonia water spray gun is arranged along the direction of the flue gas to prevent ammonia water from entering the boiler; a double-layer staggered turbulent flow pipe is arranged at the horizontal flue behind the ammonia water spray gun to ensure the uniform mixing of ammonia water and the flue gas.

[0012] 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

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 A view in the figure.

[0015] In the figure: 1-boiler outlet, 2-ammonia spray gun, 3-first elbow, 4-first flue expansion joint, 5-horizontal flue, 6-turbulence pipe, 7-second elbow, 8-guide plate, 9-second flue expansion joint, 10-third elbow, 51-inlet flue, 52-outlet flue. DETAILED DESCRIPTION

[0016] See also Figure 1 , Figure 2 , a mixing flue is arranged in reverse direction of the top boiler SCR, including an inlet flue 51, a horizontal flue 5 and an outlet flue 52 connected in sequence, the horizontal flue 5 is arranged on the top of the SCR reactor, the inlet flue 51 is connected to the boiler outlet 1, the outlet flue 52 is connected to the SCR reactor inlet, the boiler outlet 1 is arranged on the top of the boiler, the SCR reactor inlet is arranged on the side of the SCR reactor away from the boiler, an ammonia spray gun 2 is arranged in the inlet flue 51, and the ammonia spray gun 2 is arranged along the flue gas direction, the inlet flue 51 is connected to a first elbow 3, the first elbow 3 is connected to a first flue expansion joint 4, the first flue The expansion joint 4 is connected to the horizontal flue 5, and the two ends of the outlet flue 52 are respectively connected to the second elbow 7 and the third elbow 10, the second elbow 7 is connected to the horizontal flue 5, the third elbow 10 is connected to the second flue expansion joint 9, the second flue expansion joint 9 is connected to the inlet of the SCR reactor, and the second elbow 7 and the third elbow 10 are provided with guide plates 8. The inlet flue 51 and the outlet flue 52 are both vertically arranged, and the horizontal flue 5 is provided with two layers of staggered turbulence tubes 6. The ammonia outlet of the ammonia spray gun 2 is arranged at the center of the flue, and the first elbow 3, the second elbow 7 and the third elbow 10 are all 90° elbows.

[0017] The utility model extends the length of the ammonia spraying mixed flue through the arrangement of the boiler top outlet and the SCR reactor inlet reversed 180 degrees, ensures that the flue gas and ammonia water are mixed evenly, and solves the problem of narrow arrangement space for the boiler and the SCR reactor.

[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 top-out boiler SCR reversely arranged mixing flue, characterized in that: The invention comprises an inlet flue (51), a horizontal flue (5) and an outlet flue (52) which are connected in sequence, wherein the horizontal flue (5) is arranged at the top of an SCR reactor, the inlet flue (51) is connected to a boiler outlet (1), the outlet flue (52) is connected to an SCR reactor inlet, the boiler outlet (1) is arranged at the top of the boiler, the SCR reactor inlet is arranged at a side of the SCR reactor away from the boiler, and an ammonia spray gun (2) is arranged in the inlet flue (51), and the ammonia spray gun (2) is arranged along the direction of the flue gas.

2. The reverse arrangement mixing flue of the ejector boiler SCR according to claim 1 is characterized in that: The inlet flue (51) is connected to a first elbow (3), the first elbow (3) is connected to a first flue expansion joint (4), the first flue expansion joint (4) is connected to a horizontal flue (5), the two ends of the outlet flue (52) are respectively connected to a second elbow (7) and a third elbow (10), the second elbow (7) is connected to the horizontal flue (5), the third elbow (10) is connected to a second flue expansion joint (9), and the second flue expansion joint (9) is connected to an inlet of an SCR reactor.

3. The reverse arrangement mixing flue of the ejector boiler SCR according to claim 2 is characterized in that: Guide plates (8) are provided in the second elbow (7) and the third elbow (10).

4. The reverse arrangement mixing flue of the ejector boiler SCR according to claim 1 is characterized in that: The inlet flue (51) and the outlet flue (52) are both arranged vertically.

5. The reverse arrangement mixing flue of the ejector boiler SCR according to claim 1 is characterized in that: The horizontal flue (5) is provided with two layers of staggered turbulence pipes (6).

6. The reverse arrangement mixing flue of the ejector boiler SCR according to claim 1 is characterized in that: The ammonia water outlet of the ammonia water spray gun (2) is arranged at the center of the flue.

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