Novel anti-abrasion and anti-blocking flue ammonia injection device

Abstract

The utility model discloses a novel anti-wear and anti-blocking flue ammonia injection device, which relates to the technical field of flue ammonia injection and comprises a flue body, an ammonia injection main pipe body and a connecting support pipe, and an injection branch pipe is welded inside the flue body. According to the novel anti-abrasion and anti-blocking flue ammonia injection device, the anti-abrasion baffle is additionally arranged on the injection branch pipe on the inner side of the flue body, and the anti-blocking baffle is additionally arranged on the nozzle body, so that scouring of flue gas and particulate matter in the flue gas to an ammonia injection structure is relieved, and the situation that due to the fact that the nozzle body is blocked, ammonia injection is not uniform, and the denitration effect is affected is effectively avoided; by optimizing the structure, prolonging the service life of the injection structure, reducing the structure maintenance and replacement frequency and improving the overall stability of a denitration system, the novel anti-abrasion and anti-blocking flue ammonia injection device solves the problems that after the ammonia injection structure operates for a period of time, the conditions of abrasion and nozzle blockage are caused, the ammonia injection is not uniform, and the denitration effect is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue ammonia injection, in particular to a new type of wear - resistant and anti - blocking flue ammonia injection device. Background Technique

[0002] Flue ammonia injection denitration is the current mainstream denitration technical means, mainly realized through selective catalytic reduction technology. This technology uses reducing agents, such as NH3, liquid ammonia, urea, etc., which react with nitrogen oxides in the flue gas under high - temperature catalytic action to generate non - toxic and pollution - free nitrogen and water. The denitration efficiency can generally reach more than 80% - 90%.

[0003] For reduction - type denitration, whether using ammonia water or urea as the reducing agent, it is necessary to process it into gaseous ammonia and spray it into the flue through an ammonia injection device to react with NOx in the flue gas and reduce NOx to N2, so as to achieve the purpose of removing NOx. Generally, the denitration device is arranged before dust removal. Therefore, after the ammonia injection structure operates for a period of time, there will be wear and nozzle blockage, resulting in uneven ammonia spraying, affecting the denitration effect. Moreover, this device is installed inside the flue and is not easy to overhaul. Content of the Utility Model

[0004] The purpose of the utility model is to provide a new type of wear - resistant and anti - blocking flue ammonia injection device to solve the problems in the above - mentioned background technique that after the ammonia injection structure operates for a period of time, there will be wear and nozzle blockage, resulting in uneven ammonia spraying and affecting the denitration effect.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A new type of wear - resistant and anti - blocking flue ammonia injection device, including a flue main body, an ammonia injection main pipe body and a connecting support pipe. The injection branch pipe is welded inside the flue main body. The connecting support pipe and the ammonia injection main pipe body are arranged at the bottom of the injection branch pipe. Nozzle bodies are equidistantly installed on the outer side of the injection branch pipe, and an anti - blocking baffle is installed at one end of the nozzle body away from the injection branch pipe.

[0006] Preferably, one end of the bottom of the injection branch pipe is connected to one end of the connecting support pipe.

[0007] Preferably, the other end of the connecting support pipe away from the injection branch pipe is connected to the ammonia injection main pipe body.

[0008] Preferably, ammonia injection main pipe plugs are connected to both sides of the ammonia injection main pipe body.

[0009] Preferably, the injection branch pipes are equidistantly arranged inside the flue main body.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: For the novel anti-abrasion and anti-blocking flue ammonia injection device, by adding anti-abrasion baffles at the injection branch pipes inside the flue body and installing anti-blocking baffles at the nozzle body, the erosion of the flue gas and the particulate matter in the flue gas on the ammonia injection structure is reduced, effectively avoiding uneven ammonia injection caused by blockage of the nozzle body, which affects the denitrification effect; through structural optimization, the service life of the ammonia injection structure is prolonged, the frequency of structure maintenance and replacement is reduced, and the overall stability of the denitrification system is increased, solving the problems of wear and nozzle blockage after the ammonia injection structure operates for a period of time, resulting in uneven ammonia injection and affecting the denitrification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic top cross-sectional structure diagram of the flue of the present utility model;

[0012] Figure 2 It is a schematic side view structure diagram of the anti-blocking baffle of the present utility model;

[0013] Figure 3 It is a schematic first front cross-sectional structure diagram of the injection branch pipe of the present utility model;

[0014] Figure 4 It is a schematic second front cross-sectional structure diagram of the injection branch pipe of the present utility model;

[0015] Figure 5 It is a schematic three-dimensional structure diagram of the injection branch pipe of the present utility model.

[0016] In the figure: 1, flue body; 2, main ammonia injection pipe body; 3, connecting support pipe; 4, main ammonia injection pipe plug; 5, injection branch pipe; 6, anti-abrasion baffle; 7, anti-blocking baffle; 8, nozzle body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5, the present utility model provides a technical solution: a new type of anti-wear and anti-blocking flue ammonia injection device, including a flue main body 1, an ammonia injection main pipe body 2 and a connecting support pipe 3. A spray branch pipe 5 is welded inside the flue main body 1. The bottom of the spray branch pipe 5 is provided with a connecting support pipe 3 and an ammonia injection main pipe body 2. Nozzles 8 are equidistantly installed outside the spray branch pipe 5. An anti-blocking baffle 7 is installed at one end of the nozzle 8 away from the spray branch pipe 5. The bottom of the spray branch pipe 5 is connected to one end of the connecting support pipe 3. The end of the connecting support pipe 3 away from the spray branch pipe 5 is connected to the ammonia injection main pipe body 2. Ammonia injection main pipe plugs 4 are connected to both sides of the ammonia injection main pipe body 2. The spray branch pipes 5 are equidistantly arranged inside the flue main body 1.

[0019] During specific implementation, to avoid nozzle wear and nozzle blockage, an anti-blocking baffle 7 is provided at the top of the nozzle 8, and the directions of both the nozzle 8 and the anti-blocking baffle 7 are perpendicular to the flue gas flow direction, and the number is the same as the number of nozzles. An anti-wear baffle 6 is provided in the flue gas inlet direction of the spray branch pipe 5 to reduce the erosion and wear of the flue gas and particulate matter in the flue gas on the ammonia injection structure. The ammonia injection main pipe body 2 and the spray branch pipes 5 inside the flue main body 1 are staggered, which can cover the entire flue cross-section, achieving comprehensive ammonia injection coverage. This new type of anti-wear and anti-blocking flue ammonia injection device adds an anti-wear baffle 6 to the injection pipe in the flue and an anti-blocking baffle 7 to the nozzle part, reducing the erosion of the flue gas and particulate matter in the flue gas on the ammonia injection device, avoiding blockage of the nozzle 8, making the ammonia injection of the nozzle 8 uniform, and thus improving the denitrification effect.

[0020] In summary, when using this new type of anti-wear and anti-blocking flue ammonia injection device, during installation, both ends of the spray branch pipe 5 are welded to the inner wall of the flue main body 1, and the ammonia injection main pipe body 2 is connected to the external ammonia pipeline. Ammonia enters the ammonia injection structure from here, and then enters the spray branch pipe 5 through the connecting support pipe 3. The ammonia is sprayed out from the nozzle 8. The ammonia injection main pipe body 2 and the spray branch pipes 5 are staggered inside the flue main body 1, covering the entire flue cross-section, achieving comprehensive ammonia injection coverage and better denitrification effect. The content not described in detail in this description belongs to the prior art known to those skilled in the art.

[0021] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A novel abrasion - and blockage - resistant flue ammonia injection device, comprising a flue main body (1), an ammonia injection main pipe body (2) and a connecting support pipe (3), characterized in that: Inside the flue duct body (1), a spray branch pipe (5) is welded. At the bottom of the spray branch pipe (5), a connecting support pipe (3) and a main ammonia injection pipe body (2) are provided. Nozzles (8) are equidistantly installed on the outer side of the spray branch pipe (5). At one end of the nozzle (8) away from the spray branch pipe (5), an anti-blocking baffle (7) is installed.

2. The novel anti-wear and anti-blocking flue ammonia injection device according to claim 1, wherein: One end of the bottom of the spray branch pipe (5) is connected to one end of the connecting support pipe (3).

3. The novel anti-wear and anti-blocking flue ammonia injection device according to claim 2, wherein: One end of the connecting support pipe (3) away from the spray branch pipe (5) is connected to the main ammonia injection pipe body (2).

4. A novel ammonia injection device for abrasion and blockage prevention in flue ducts according to claim 3, characterized in that: On both sides of the main ammonia injection pipe body (2), ammonia injection main pipe blanking plates (4) are connected.

5. A novel anti-abrasion and anti-blocking flue ammonia injection device according to claim 3, characterized in that: The spray branch pipes (5) are equidistantly arranged inside the flue duct body (1).

Images