A low-wind high-NOx concentration flue gas denitration ammonia injection grid

Abstract

The utility model discloses a kind of denitration ammonia injection grating of low wind amount high NOx concentration flue gas, including branch pipe assembly, the front end of the branch pipe assembly is provided with ammonia injection auxiliary mechanism, the ammonia injection auxiliary mechanism includes the injection pipe fixedly connected in the front end of branch pipe assembly, the outside of the injection pipe is fixedly connected with fixed ring, the outside of the injection pipe is slidably connected with sliding ring close to the front side of fixed ring, the front end of the sliding ring is fixedly connected with sleeve connection bin.The utility model said a kind of denitration ammonia injection grating of low wind amount high NOx concentration flue gas, ammonia is outwardly injected by injection pipe, air flow is used to promote barrier plate, drive sleeve connection bin to move forward, reach the purpose of facilitating the gap between sleeve connection bin and plug head is reduced, this design can effectively reduce the ammonia flow rate of sleeve connection bin injection, realize the low-speed uniform injection of ammonia, after ammonia evenly diffuses in flue gas, not only significantly improve denitration efficiency, while enhance the operation stability of denitration system.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to a denitrification ammonia injection grid for flue gas with low air volume and high NOx concentration. Background Technology

[0002] Nitrogen oxides (NOx) are one of the main sources of air pollution. NOx exists in various forms, with NO and NO2 being the primary air pollutants, and a small amount of N2O. NOx emissions mainly originate from the direct combustion of energy sources such as coal. There are two main measures to reduce NOx emissions: one is to control the formation of NOx during combustion, i.e., low-NOx combustion technology; the other is to treat the generated NOx, i.e., flue gas denitrification technology. However, in the denitrification process for high-concentration ammonia nitrogen oxides, due to the high concentration, it cannot be completely treated in one step. Therefore, denitrification agents, catalysts, and other substances are sprayed into the channel to eliminate ammonia nitrogen oxides.

[0003] Traditional ammonia injection grids for denitrification of high NOx concentration flue gas have some drawbacks. In actual use, the ammonia injection grid sprays ammonia directly outwards, and a large amount of ammonia is sprayed directly out with the air volume, which leads to uneven ammonia injection. Consequently, the ammonia cannot be evenly distributed in the flue gas, and the amount of ammonia at each point in the flue gas is large or small, resulting in unstable and low denitrification efficiency. Utility Model Content

[0004] The main objective of this invention is to provide a denitrification ammonia injection grid for flue gas with low air volume and high NOx concentration, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas includes a branch pipe assembly. An ammonia injection auxiliary mechanism is located at the front end of the branch pipe assembly. The ammonia injection auxiliary mechanism includes an injection pipe fixedly connected to the front end of the branch pipe assembly. A fixing ring is fixedly connected to the outer side of the injection pipe. A sliding ring is slidably connected to the outer side of the injection pipe near the front of the fixing ring. A socket is fixedly connected to the front end of the sliding ring. A spring assembly is sleeved on the outer side of the injection pipe near the front of the sliding ring. A limiting ring is fixedly connected to the outer side of the injection pipe near the front of the spring assembly. An injection head is fixedly connected to the front end of the injection pipe. A baffle plate is fixedly connected to the inner side of the socket. A plug is placed at the front end of the socket, and a connecting rod is fixedly connected to the front end of the plug.

[0007] Preferably, a limiting rod is slidably connected inside the fixing ring, the sleeve is sleeved on the outside of the injection pipe, and the spring assembly and the limiting ring are both located inside the sleeve.

[0008] Preferably, the rear end of the spring assembly is fixedly connected to the front end of the sliding ring, the front end of the spring assembly is fixedly connected to the rear end of the limiting ring, and the spray head corresponds to the barrier plate.

[0009] Preferably, the centerlines of the spray pipe, fixing ring, sleeve chamber, limiting ring, spray head, baffle plate, and plug head are located on the same straight line, and the shape of the spray head is conical.

[0010] Preferably, the plug head is frustum-shaped, the rear end of the connecting rod is fixedly connected to the front end of the fixing ring near the lower side of the plug head, the front end of the limiting rod is fixedly connected to the rear end of the sliding ring, and there are three sets of limiting rods.

[0011] Preferably, the lower end of the branch pipe assembly is fixedly connected to an ammonia injection main pipe, the lower end of the ammonia injection main pipe is fixedly connected to a fixing seat, and the ammonia injection main pipe and the branch pipe assembly are in communication.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Ammonia gas is injected outward through the injection pipe, and the airflow pushes the baffle plate, causing the socket to move forward. This design can effectively reduce the gap between the socket and the plug head, thereby reducing the gas velocity of the ammonia gas ejected from the socket and achieving low-speed and uniform injection of ammonia gas. After the ammonia gas is evenly diffused in the flue gas, it not only significantly improves the denitrification efficiency but also enhances the operational stability of the denitrification system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas according to the present invention.

[0015] Figure 2 This is a schematic diagram of the ammonia injection auxiliary mechanism of a denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas according to the present invention.

[0016] Figure 3 This is a partial structural diagram of the ammonia injection auxiliary mechanism of a denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas according to this utility model. Figure 1 ;

[0017] Figure 4 This is a partial structural diagram of the ammonia injection auxiliary mechanism of a denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas according to this utility model. Figure 2 .

[0018] In the diagram: 1. Branch pipe assembly; 2. Ammonia injection main pipe; 3. Fixing seat; 4. Ammonia injection auxiliary mechanism; 41. Injection pipe; 42. Fixing ring; 43. Sliding ring; 44. Connecting chamber; 45. Spring assembly; 46. Limiting ring; 47. Injection head; 48. Barrier plate; 49. Plug head; 410. Connecting rod; 411. Limiting rod. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figure 1-4 As shown, a denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas includes a branch pipe assembly 1. An ammonia injection auxiliary mechanism 4 is provided at the front end of the branch pipe assembly 1. The ammonia injection auxiliary mechanism 4 includes an injection pipe 41 fixedly connected to the front end of the branch pipe assembly 1. A fixing ring 42 is fixedly connected to the outside of the injection pipe 41. A sliding ring 43 is slidably connected to the outside of the injection pipe 41 near the front of the fixing ring 42. A socket 44 is fixedly connected to the front end of the sliding ring 43. A spring assembly 45 is sleeved on the outside of the injection pipe 41 near the front of the sliding ring 43. A limiting ring 46 is fixedly connected to the outside of the injection pipe 41 near the front of the spring assembly 45. An injection head 47 is fixedly connected to the front end of the injection pipe 41. A baffle plate 48 is fixedly connected to the inside of the socket 44. A plug head 49 is placed at the front end of the socket 44. A connecting rod 410 is fixedly connected to the front end of the plug head 49.

[0021] In this embodiment, a limiting rod 411 is slidably connected inside the fixing ring 42. The sleeve 44 is sleeved on the outside of the spray pipe 41. The spring assembly 45 and the limiting ring 46 are both located inside the sleeve 44. The rear end of the spring assembly 45 is fixedly connected to the front end of the sliding ring 43. The front end of the spring assembly 45 is fixedly connected to the rear end of the limiting ring 46. The spray head 47 and the baffle plate 48 correspond to each other. The axis of the spray pipe 41, fixing ring 42, sleeve 44, limiting ring 46, spray head 47, baffle plate 48, and plug head 49 are located on the same straight line. The spray head 47 is conical in shape, and the plug head 49 is frustum-shaped. The rear end of the connecting rod 410 is fixedly connected to the front end of the fixing ring 42 near the lower side of the plug head 49. The front end of the limiting rod 411 is fixedly connected to the rear end of the sliding ring 43. There are three sets of limiting rods 411.

[0022] Specifically, during ammonia injection, ammonia is ejected outward from the injection pipe 41 along with the gas, causing the ammonia to be sprayed from the injection head 47 towards the baffle plate 48. This ammonia pushes the baffle plate 48 to move, which in turn moves the socket 44. The socket 44 then causes the sliding ring 43 to slide along the injection pipe 41, thereby compressing the spring assembly 45. The sliding ring 43 also causes the limiting rod 411 to slide inside the fixed ring 42, reducing the distance between the socket 44 and the plugging head 49. This reduces the gap between the socket 44 and the plugging head 49. At this time, the ammonia ejected from the injection pipe 41 passes through the socket 44... The ammonia is sprayed outward from the receiving chamber 44, and the ammonia is obstructed by the plug head 49, thereby reducing the amount of ammonia sprayed out and causing the ammonia to be sprayed outward along the edge of the plug head 49, so that the ammonia is sprayed evenly in all directions. The ammonia gas is sprayed outward through the injection pipe 41, and the airflow pushes the baffle plate 48, which drives the receiving chamber 44 forward. This can achieve the purpose of reducing the gap between the receiving chamber 44 and the plug head 49. This design can effectively reduce the ammonia gas flow rate sprayed from the receiving chamber 44, and achieve low-speed uniform injection of ammonia gas. After the ammonia gas is evenly diffused in the flue gas, it not only significantly improves the denitrification efficiency, but also enhances the operational stability of the denitrification system.

[0023] In this embodiment, the lower end of the branch pipe assembly 1 is fixedly connected to the ammonia injection main pipe 2, and the lower end of the ammonia injection main pipe 2 is fixedly connected to the fixing seat 3. The ammonia injection main pipe 2 and the branch pipe assembly 1 are in communication.

[0024] Specifically, ammonia is delivered to the ammonia injection main pipe 2, and then the ammonia flows into the branch pipe assembly 1, thereby making ammonia present in the injection pipe 41.

[0025] Working principle:

[0026] In use, ammonia is first delivered to the main ammonia injection pipe 2, then flows into the branch pipe assembly 1, thus creating ammonia in the injection pipe 41. During ammonia injection, the ammonia is ejected outward from the injection pipe 41 along with the gas, causing the ammonia to be sprayed from the injection head 47 towards the baffle plate 48. This ammonia pushes the baffle plate 48 to move, which in turn causes the baffle plate 48 to move the socket 44. The socket 44 then causes the sliding ring 43 to slide along the injection pipe 41, thereby compressing the spring assembly 45 and causing the sliding ring 43 to slide the limiting rod 411 inside the fixed ring 42. This reduces the distance between the socket 44 and the plugging head 49, thus increasing the pressure between the socket 44 and the plugging head 49. As the gap between the nozzles decreases, the ammonia ejected from the injection pipe 41 is ejected outward through the socket 44, and the ammonia is obstructed by the plug head 49, thereby reducing the amount of ammonia ejected and causing the ammonia to be ejected outward along the edge of the plug head 49, so that the ammonia is evenly ejected in all directions. The ammonia gas is ejected outward through the injection pipe 41, and the airflow pushes the baffle plate 48, which moves the socket 44 forward, so as to facilitate the reduction of the gap between the socket 44 and the plug head 49. This design can effectively reduce the ammonia gas flow rate ejected from the socket 44, and realize the low-speed uniform injection of ammonia gas. After the ammonia gas is evenly diffused in the flue gas, it not only significantly improves the denitrification efficiency, but also enhances the operational stability of the denitrification system.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-velocity high-NOx concentration flue gas ammonia injection grid for denitrification, comprising a branch pipe assembly (1), characterized in that: The front end of the branch pipe assembly (1) is provided with an ammonia injection auxiliary mechanism (4). The ammonia injection auxiliary mechanism (4) includes an injection pipe (41) fixedly connected to the front end of the branch pipe assembly (1). A fixing ring (42) is fixedly connected to the outside of the injection pipe (41). A sliding ring (43) is slidably connected to the front side of the injection pipe (41) near the fixing ring (42). A socket (44) is fixedly connected to the front end of the sliding ring (43). The outside of the injection pipe (41) is... A spring assembly (45) is sleeved on the front side near the sliding ring (43). A limiting ring (46) is fixedly connected to the outer side of the spray pipe (41) near the front side of the spring assembly (45). A spray head (47) is fixedly connected to the front end of the spray pipe (41). A baffle plate (48) is fixedly connected to the inner side of the sleeve chamber (44). A plug head (49) is placed at the front end of the sleeve chamber (44). A connecting rod (410) is fixedly connected to the front end of the plug head (49).

2. The ammonia injection grid for the denitration of a low-volume high-NOx-concentration flue gas according to claim 1, characterized in that: The fixed ring (42) is internally slidably connected to a limiting rod (411), the socket (44) is sleeved on the outside of the injection pipe (41), and the spring assembly (45) and the limiting ring (46) are both located inside the socket (44).

3. The low-velocity high-NOx concentration flue gas ammonia injection grid for denitrification according to claim 2, characterized in that: The rear end of the spring assembly (45) is fixedly connected to the front end of the sliding ring (43), the front end of the spring assembly (45) is fixedly connected to the rear end of the limiting ring (46), and the spray head (47) corresponds to the barrier plate (48).

4. The denitrification ammonia injection grid for low-volume, high-NOx-concentration flue gas according to claim 2, characterized in that: The axis of the spray pipe (41), fixing ring (42), sleeve chamber (44), limiting ring (46), spray head (47), baffle plate (48), and plug head (49) are located on the same straight line, and the spray head (47) is conical in shape.

5. The low-velocity high-NOx concentration flue gas ammonia injection grid for denitrification according to claim 2, characterized in that: The plug head (49) is shaped like a frustum. The rear end of the connecting rod (410) is fixedly connected to the front end of the fixing ring (42) near the lower side of the plug head (49). The front end of the limiting rod (411) is fixedly connected to the rear end of the sliding ring (43). There are three sets of the limiting rod (411).

6. The low-velocity high-NOx concentration flue gas ammonia injection grid for denitrification according to claim 1, characterized in that: The lower end of the branch pipe assembly (1) is fixedly connected to an ammonia injection main pipe (2), and the lower end of the ammonia injection main pipe (2) is fixedly connected to a fixing seat (3). The ammonia injection main pipe (2) and the branch pipe assembly (1) are in communication.

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