Ammonia spraying grid

Abstract

The invention relates to the technical field of ammonia spraying grids, and discloses an ammonia spraying grid which comprises a main pipe and a branch pipe, the main pipe and the branch pipe are hollow, and the branch pipe is arranged in the main pipe in a penetrating mode and communicates with the main pipe; the connecting pipe is arranged in the branch pipe in a communicating manner; the sleeve is in threaded connection with the connecting pipe, and three staggered flow guide plates are fixed in the sleeve; the guide plates are arranged at the bottoms of the flow guide plates in pairs and are in a gathering shape, the three connecting rods correspond to the three flow guide plates respectively and are fixedly connected with the sleeve, and the top ends of the connecting rods are rotationally connected with first fan blades. Ammonia gas is accurately distributed to two air outlets through a flow guide plate, horizontal and vertical bidirectional stirring of ammonia and flue gas is achieved through cooperation of fan blades and air blowing plates in different directions, the multiple sets of fan blades and the air blowing plates achieve the synergistic effect, the mixing uniformity is greatly improved, it is guaranteed that ammonia and flue gas fully react, and the ammonia spraying grating is high in mixing efficiency and good in mixing effect. The core function effects of denitration and the like are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia injection grid, in particular to an ammonia injection grid. BACKGROUND

[0002] In the field of industrial flue gas denitration treatment, the ammonia injection grid is the core component to realize uniform mixing of ammonia and flue gas and guarantee the efficiency of denitration reaction. Its performance directly affects the removal effect of nitrogen oxides by the denitration system. At present, the ammonia injection grids on the market generally have the problem of uneven mixing of ammonia: most products only realize mixing through single-direction airflow guiding or stirring structure, which is difficult to cover the flue gas in different areas of the flue, and is prone to local ammonia excess or deficiency, resulting in fluctuation of denitration efficiency and even secondary pollution. At the same time, the maintenance convenience of the existing ammonia injection grid is poor. The conveying pipelines (main pipe and branch pipe) and the mixing component of the traditional products are mostly fixedly connected or have complex disassembly structure. When impurities and dust accumulate inside the pipeline, or the mixing component is worn or fails, a large number of associated parts need to be disassembled to clean or replace them, which not only consumes manpower and time, but also prolongs the equipment downtime cycle and affects the continuity of industrial production. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides an ammonia injection grid to solve the problems mentioned in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: An ammonia injection grid, comprising: A main pipe and a branch pipe, the inside of the main pipe and the branch pipe is hollow, the branch pipe is arranged through the inside of the main pipe and communicates with the main pipe; A connecting pipe is arranged in the inside of the branch pipe in communication; A sleeve is connected with the connecting pipe through threads, three guide plates are fixed in the inside of the sleeve in a staggered manner; Two guide plates are arranged in a group at the bottom of the guide plate and are gathered; Three connecting rods are arranged corresponding to the three guide plates and are fixedly connected with the sleeve, a fan blade one is rotatably connected at the top end of the connecting rod, and a wind scraping plate one is fixedly installed on the side of the fan blade one away from the connecting rod; Three arc-shaped plates are fixedly installed at the top end of the sleeve; A guide rod is fixed between the three guide plates, a fan blade two is rotatably connected at the top end of the guide rod, and a wind scraping plate two is arranged at the top end of the fan blade two; An air outlet one and an air outlet two are formed by the guide plate and the sleeve, three air outlet ones are arranged corresponding to the three guide plates, and three air outlet twos are arranged corresponding to the three arc-shaped plates.

[0005] Preferably, further comprising: A main cover, a threaded groove one is arranged in the interior of the main pipe, the main cover is connected with the threaded groove one for plugging the main pipe; A branch cover, threaded grooves two are arranged in the two ends of the branch pipe, the branch cover is connected with the threaded grooves two for plugging the branch pipe.

[0006] Preferably, a threaded groove three is arranged in the interior of the connecting pipe, the threaded groove three is matched with the sleeve for fixing the sleeve.

[0007] Preferably, at least one sealing rubber ring is arranged at the connection between the sleeve and the connecting pipe.

[0008] Preferably, further comprising: A first reinforcing member is arranged at the connection between the main pipe and the branch pipe for reinforcing the connection between the main pipe and the branch pipe; A second reinforcing member is arranged at the connection between the connecting pipe and the sleeve for reinforcing the connection between the connecting pipe and the sleeve.

[0009] Preferably, the material of the flow guide plate is stainless steel, and the thickness range is 3-5 mm.

[0010] Preferably, an anticorrosive coating is arranged on the surface of the flow guide plate, and the thickness of the anticorrosive coating is not less than 0.1 mm.

[0011] Preferably, the number of blades of the fan blade one and the fan blade two is 4-6, and the inclination angle of the blades is 30°-45°.

[0012] Preferably, the material of the main pipe, the branch pipe, the connecting pipe and the sleeve is alloy steel.

[0013] Preferably, the outer diameter of the sleeve ranges from 100 mm to 150 mm, and the diameter of the air outlet one and the air outlet two ranges from 20 mm to 30 mm.

[0014] Compared with the prior art, the beneficial effects of the present application are: 1. The ammonia injection grid, ammonia gas is mixed fully and efficiently: the ammonia gas is precisely shunted to two air outlets through the flow guide plate, and the fan blades and the wind scraping plates in different directions are matched to realize horizontal and vertical two-way stirring of ammonia and flue gas respectively, and the multiple fan blades and wind scraping plates work together to greatly improve the mixing uniformity, ensure the full reaction of ammonia and flue gas, and guarantee the core function effect of denitration.

[0015] 2. The ammonia injection grid, the maintenance convenience is high: the main pipe and the branch pipe are connected with the main cover and the branch cover through threads, and the internal impurities can be quickly cleaned by detaching the covers; the sleeve and the connecting pipe are connected through thread matching, and the sleeve can be disassembled by rotating, which is convenient for the maintenance or replacement of the fan blades, the flow guide plate and other components in the sleeve, and reduces the maintenance cost and difficulty.

[0016] 3、The ammonia injection grid is stable and reliable in structure: the main pipe and the branch pipe are in through communication to form a stable ammonia gas conveying channel, the threaded connection of the connecting pipe and the sleeve and the optional reinforcing member can ensure that the assembly does not loosen under the impact of flue gas flow and equipment vibration; the core components are made of corrosion-resistant and high-strength materials, which prolongs the service life of the equipment and reduces the risk of failure.

[0017] 4、The ammonia injection grid has high ammonia utilization rate: the converging guide plate can converge the ammonia gas flow to increase the injection speed, ensure that the ammonia gas effectively drives the fan blades to rotate and mix with the flue gas, and the sealing rubber ring (optional) can prevent ammonia gas from leaking from the connecting gap, avoid waste of ammonia gas, improve resource utilization rate, and reduce corrosion of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of the structure of the present application; Figure 2 is an exploded perspective view of the structure of the present application; Figure 3 is a side view of the structure of the present application; Figure 4 is a perspective view of the dispersing structure of the present application; Figure 5 is a bottom view of the sleeve of the present application; Figure 6 is a top view of the sleeve of the present application.

[0019] In the figure: 1, main pipe; 2, branch pipe; 3, connecting thread; 4, thread groove one; 5, thread groove two; 6, main plug; 7, branch plug; 8, connecting pipe; 9, thread groove three; 10, sleeve; 11, guide plate; 12, guide plate; 13, connecting rod; 14, fan blade one; 15, wind scraping plate one; 16, arc plate; 17, guide rod; 18, fan blade two; 19, wind scraping plate two; 20, air outlet one; 21, air outlet two. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] Embodiment: Please refer to Figures 1-6 , An ammonia injection grid comprises: A main pipe 1 and a branch pipe 2, the main pipe 1 and the branch pipe 2 are hollow inside, the branch pipe 2 is arranged through the inside of the main pipe 1 and communicates with the main pipe 1; A connecting pipe 8 is arranged in communication with the inside of the branch pipe 2; A sleeve 10 is threadedly connected with the connecting pipe 8, and three staggered flow guide plates 11 are fixed in the inside of the sleeve 10; Two guide plates 12 are arranged in a group at the bottom of each of the flow guide plates 11 and are convergent; Three connecting rods 13 are arranged in correspondence with the three flow guide plates 11 respectively and are fixedly connected with the sleeve 10, and a fan blade 14 is rotatably connected to the top end of each of the connecting rods 13, and a wind scraping plate 15 is fixedly installed on the side of the fan blade 14 away from the connecting rod 13; Three arc-shaped plates 16 are fixedly installed at the top end of the sleeve 10; A guide rod 17 is fixed between the three flow guide plates 11, and a fan blade 18 is rotatably connected to the top end of the guide rod 17, and a wind scraping plate 19 is arranged at the top end of the fan blade 18; Three air outlets 20 are arranged in correspondence with the three flow guide plates 11 respectively, and three air outlets 21 are arranged in correspondence with the three arc-shaped plates 16 respectively; Specifically, the ammonia gas conveying basic path: the main pipe 1 and the hollow branch pipe 2 form a first-level conveying channel, and the branch pipe 2 penetrates through the main pipe 1 and is in communication, so that the ammonia gas received by the main pipe 1 can be quickly dispersed to each branch pipe 2, avoiding the accumulation of ammonia gas in a single channel, and laying a foundation for subsequent uniform distribution; Ammonia gas diversion and introduction: the connecting pipe 8 as a second-level conveying component can guide the ammonia gas in the branch pipe 2 to the sleeve 10 in a directional manner after being in communication with the branch pipe 2, so as to realize the accurate transition of the ammonia gas from the main conveying path to the mixing core area; Ammonia gas distribution and mixing start in the sleeve 10: The shunt effect of the flow guide plates 11: the three flow guide plates 11 fixed in the sleeve 10 in a staggered manner can forcibly separate the ammonia gas entering the sleeve 10 into multiple gas streams, and at the same time, form three air outlets 20 and three air outlets 21 in cooperation with the inner wall of the sleeve 10, so as to ensure that the ammonia gas is shunted according to the preset path; Horizontal mixing logic of the air outlet 20: the guide plates 12 at the bottom of the flow guide plates 11 are convergent, which can converge the ammonia gas entering the air outlet 20, so as to improve the ejection speed of the ammonia gas; the high-speed ammonia gas impacts the fan blade 14 to make it rotate, the rotating fan blade 14 drives the surrounding flue gas to flow, so as to realize the horizontal preliminary mixing of the ammonia gas and the flue gas; the synchronously rotating wind scraping plate 15 further stirs the flue gas, expands the mixing range, and enhances the mixing uniformity; The vertical mixing logic of the air outlet two 21: three arc-shaped plates 16 are fixed at the top end of the sleeve 10, which guides the ammonia gas entering the air outlet two 21 to the fan blade two 18; the ammonia gas impacts the fan blade two 18 to rotate around the guide rod 17, and the rotation of the fan blade two 18 drives the vertical smoke flow, which is complementary to the horizontal mixing to eliminate the stratification phenomenon of the smoke and the ammonia gas; the wind scraping plate two 19 at the top end of the fan blade two 18 further strengthens the vertical airflow disturbance, and finally realizes the full-range uniform mixing of the ammonia gas and the smoke; In the embodiment, further comprising: The main plug cover 6 is internally provided with a threaded groove one 4, and the main plug cover 6 is threadedly connected with the threaded groove one 4 for plugging the main pipe 1; The branch plug cover 7 is internally provided with a threaded groove two 5, and the branch plug cover 7 is threadedly connected with the threaded groove two 5 for plugging the branch pipe 2; Specifically, the main pipe 1 plugging and cleaning: the threaded groove one 4 internally provided in the main pipe 1 is threadedly connected with the main plug cover 6; in normal use, the main plug cover 6 can plug the end of the main pipe 1 to prevent ammonia gas leakage; when impurities or dust accumulate in the main pipe 1, the main plug cover 6 can be directly removed for cleaning the inside of the main pipe 1 without disassembling the entire conveying assembly, thereby simplifying the maintenance process; The branch pipe 2 plugging and cleaning: the threaded groove two 5 at the two ends of the branch pipe 2 cooperates with the branch plug cover 7 to effectively plug the branch pipe 2 port to avoid ammonia gas leakage from the end of the branch pipe 2; similarly, after the branch plug cover 7 is removed, the impurities in the inside of the branch pipe 2 can be directly cleaned to ensure the smoothness of the inside of the branch pipe 2 and prevent the blockage from affecting the ammonia gas conveying efficiency; In the embodiment, the connecting pipe 8 is internally provided with a threaded groove three 9 matched with the sleeve 10 for fixing the sleeve 10; Specifically, the sleeve 10 fixing and disassembling logic: the threaded groove three 9 internally provided in the connecting pipe 8 is matched with the external thread structure of the sleeve 10, and the sleeve 10 is fixedly connected with the connecting pipe 8 through thread rotation, which not only ensures that the sleeve 10 is stable and does not move during work to avoid displacement of the sleeve 10 due to airflow impact, but also enables the sleeve 10 to be disassembled from the connecting pipe 8 by rotating the sleeve 10 when the internal components such as the fan blade and the guide plate 11 of the sleeve 10 need to be repaired or replaced, without damaging other parts, thereby realizing quick disassembly and reducing maintenance cost; In the embodiment, at least one sealing rubber ring is arranged at the connection between the sleeve 10 and the connecting pipe 8; Specifically, the sealing and leakage prevention principle is that a sealing rubber ring is arranged at the connection between the sleeve 10 and the connecting pipe 8, the sealing rubber ring is used to fill the small gaps in the connection gap by virtue of the elastic deformation characteristics of the sealing rubber ring; when the sleeve 10 and the connecting pipe 8 are fixed by threads, the sealing rubber ring is extruded and tightly attached between the connection surfaces to form a sealing barrier, effectively preventing ammonia gas from leaking from the connection gap, ensuring that all ammonia gas enters the sleeve 10 to participate in mixing, improving the utilization rate of ammonia gas, and avoiding corrosion of other parts of the equipment caused by ammonia gas leakage; In an embodiment, further comprising: The first reinforcing member is arranged at the connection between the main pipe 1 and the branch pipe 2, and is used to reinforce the connection between the main pipe 1 and the branch pipe 2. The second reinforcing member is arranged at the connection between the connecting pipe 8 and the sleeve 10, and is used to reinforce the connection between the connecting pipe 8 and the sleeve 10. Specifically, the main pipe 1 and the branch pipe 2 are connected and reinforced: the first reinforcing member is installed at the through connection between the main pipe 1 and the branch pipe 2, the connection strength between the two is enhanced, displacement of the branch pipe 2 or loosening of the connection between the main pipe 1 and the branch pipe 2 caused by pressure fluctuations during ammonia gas transportation, equipment vibration and other factors is prevented, the structural stability of the primary conveying channel is ensured, and ammonia gas leakage at the connection is avoided. The connecting pipe 8 and the sleeve 10 are connected and reinforced: the second reinforcing member is arranged at the threaded connection between the connecting pipe 8 and the sleeve 10, the fixing effect of the two is further strengthened, loosening of the threads of the sleeve 10 under the action of the reaction force generated by the rotation of the fan blade, airflow impact and other actions is prevented, the sleeve 10 is ensured to always be in a stable working position, and the reliability of the subsequent mixing process is ensured. In an embodiment, the material of the guide plate 11 is stainless steel, and the thickness of the guide plate 11 is 3-5 mm. Specifically, the material selection logic: the guide plate 11 is made of stainless steel, which has the characteristics of corrosion resistance and high temperature resistance, and is suitable for the working environment of high temperature and corrosion-resistant components in the flue. The guide plate 11 is prevented from rusting due to long-term contact with flue gas and ammonia gas, and the service life is prolonged. At the same time, stainless steel has high structural strength and can withstand the force caused by ammonia gas impact and airflow disturbance, preventing the guide plate 11 from deforming. The thickness design basis: the thickness range of 3-5 mm ensures the structural strength of the guide plate 11 while avoiding excessive space occupation in the sleeve 10, ensuring sufficient flow passage for ammonia gas. At the same time, a reasonable thickness can reduce the load of the guide plate 11 itself on the overall structure of the sleeve 10, ensuring the stability of the connection between the sleeve 10 and the connecting pipe 8. In an embodiment, the surface of the guide plate 11 is provided with a corrosion-resistant coating, and the thickness of the corrosion-resistant coating is not less than 0.1 mm. Specifically, a corrosion-resistant coating with a thickness of not less than 0.1 mm is arranged on the surface of the stainless steel flow guide plate 11. The coating can form a dense protective film on the surface of the flow guide plate 11, preventing the flow guide plate 11 from directly contacting corrosive substances such as sulfides and nitrogen oxides in the flue gas and ammonia gas, and further improving the corrosion resistance of the flow guide plate 11. The minimum thickness of 0.1 mm ensures uniform coating coverage without leaks, while preventing the coating from being too thick to affect the smoothness of the flow guide plate 11 surface and preventing ammonia gas from stagnating on the flow guide plate 11 surface, ensuring ammonia gas diversion efficiency. In embodiments: the number of blades of the fan blade one 14 and the fan blade two 18 is 4-6, and the inclination angle of the blades is 30°-45°; Specifically, the number of blades is designed: the fan blade one 14 and the fan blade two 18 use 4-6 blades. This number range can balance the airflow impact response speed and the mixing coverage range. Too few blades will cause single blade stress to be too large, which is prone to deformation, and the mixed gas flow coverage is small. Too many blades will increase airflow resistance, reduce fan rotation speed, and affect mixing efficiency. Inclination angle effect: the inclination angle of the blades is 30°-45°, which can generate the maximum rotational torque when ammonia gas impacts the blades, ensuring that the fan rotates at an appropriate speed. At the same time, this angle can guide the airflow to flow along the inclination direction of the blades, forming efficient airflow disturbance, promoting the rapid fusion of ammonia gas and flue gas, and avoiding increased airflow resistance due to too large angle or insufficient fan rotation power due to too small angle. In embodiments: the material of the main pipe 1, the branch pipe 2, the connecting pipe 8, and the sleeve 10 is alloy steel; Specifically, the main pipe 1, the branch pipe 2, the connecting pipe 8, and the sleeve 10 are made of alloy steel. Alloy steel has high strength and good toughness, ensuring the connection precision and structural stability of each component and prolonging the service life of the overall equipment. In embodiments: the outer diameter of the sleeve 10 is 100-150 mm, and the diameter of the air outlet one 20 and the air outlet two 21 is 20-30 mm; Specifically, the sleeve 10 outer diameter logic: the outer diameter of the sleeve 10 is 100-150 mm, which needs to match the flue inner diameter of 200-500 mm. When the sleeve 10 is installed in the flue, it will not cause the flue airflow passage to be narrow due to too large outer diameter, affecting the normal flow of flue gas. It also will not cause the flue gas around the sleeve 10 to flow too fast due to too small outer diameter, reducing the contact time of ammonia gas and flue gas, and ensuring mixing effect. The diameter of the air outlet: the diameter of the air outlet one 20 and the air outlet two 21 of 20-30mm can control the ammonia gas spraying speed generally 5-10m / s, too small diameter will lead to ammonia gas flow too fast, which can directly pass through the flue gas layer, reducing the mixing efficiency; too large diameter will lead to ammonia gas flow too slow, which can not effectively impact the fan blade rotation, at the same time, ammonia gas diffusion range is small, which is difficult to fully contact with the flue gas, the diameter range can ensure that the ammonia gas is sprayed at the optimal speed, which takes into account the fan driving and mixing efficiency; Working principle: when in use, the ammonia spraying grid is placed in the flue, the ammonia supply pipeline is connected through the connecting thread 3 on the main pipe 1, the ammonia gas enters the hollow main pipe 1, then is dispersed to the hollow branch pipe 2 which penetrates the main pipe 1 and is connected, and then is introduced into the sleeve 10 through the connecting pipe 8 which is connected with the branch pipe 2; The three guide plates 11 fixed alternately in the sleeve 10 separate the ammonia gas, which cooperates with the sleeve 10 to form three air outlet one 20 and three air outlet two 21, the ammonia gas entering the air outlet one 20 is gathered and accelerated through the bottom gathering-shaped guide plate 12 of the guide plate 11, which impacts the fan blade one 14 at the top of the connecting rod 13 to make it rotate, the fan blade one 14 drives the wind scraping plate one 15 to stir the flue gas, which realizes the horizontal mixing of ammonia and flue gas; the ammonia gas entering the air outlet two 21 impacts the fan blade two 18 on the guide rod 17 under the guide of the arc plate 16 at the top of the sleeve 10, which drives the wind scraping plate two 19 to rotate, which completes the vertical mixing of ammonia and flue gas, and finally realizes the full range uniform mixing to ensure the reaction effect; The main pipe 1 is connected with the main plug cover 6 through the thread groove one 4, the branch pipe 2 is connected with the branch plug cover 7 through the thread groove two 5, and the plug cover can be disassembled to clean the internal impurities; the connecting pipe 8 is connected with the sleeve 10 through the thread groove three 9, which is convenient for disassembling and repairing the sleeve 10.

[0022] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An ammonia injection grid characterized in that, Include: The main pipe (1) and branch pipe (2), the main pipe (1) and branch pipe (2) inside hollow, the branch pipe (2) through the inside of the main pipe (1) and is communicated with the main pipe (1); The connecting pipe (8) is communicated and arranged in the inside of the branch pipe (2); The sleeve (10) is connected with the connecting pipe (8) by screwing, the inside of the sleeve (10) is fixed with three staggered flow guide plates (11); The guide plate (12) is arranged in the bottom of the flow guide plate (11) and is gathered, and three connecting rods (13) are respectively arranged with three flow guide plates (11) and are fixedly connected with the sleeve (10), the top end of the connecting rod (13) is rotatably connected with the fan blade (14), and the fan blade (14) is fixedly installed with the wind scraping plate (15) on the side away from the connecting rod (13); The arc-shaped plate (16) is fixedly installed at the top end of the sleeve (10); The guide rod (17) is fixed between the three flow guide plates (11), the top end of the guide rod (17) is rotatably connected with the fan blade (18), and the top end of the fan blade (18) is provided with the wind scraping plate (19); The air outlet (20) and the air outlet (21) are formed by the flow guide plate (11) and the sleeve (10), three air outlets (20) are respectively arranged with three flow guide plates (11), and three air outlets (21) are respectively arranged with three arc-shaped plates (16). Also include:

2. The ammonia injection lattice of claim 1, wherein, The main pipe (1) is provided with a threaded groove (4) in the inside, the main plug cover (6) is connected with the threaded groove (4) for plugging the main pipe (1); The threaded groove (5) is arranged at both ends of the branch pipe (2), and the branch plug cover (7) is connected with the threaded groove (5) for plugging the branch pipe (2). The threaded groove (9) is arranged in the inside of the connecting pipe (8), and the threaded groove (9) is matched with the sleeve (10) for fixing the sleeve (10).

3. The ammonia injection lattice of claim 1, wherein: At least one sealing rubber ring is arranged at the connection between the sleeve (10) and the connecting pipe (8).

4. The ammonia injection lattice of claim 1, wherein: Also include:

5. The ammonia injection lattice of claim 1 wherein, The first reinforcing member is arranged at the connection between the main pipe (1) and the branch pipe (2), and is used for reinforcing the connection between the main pipe (1) and the branch pipe (2); The second reinforcing member is arranged at the connection between the connecting pipe (8) and the sleeve (10), and is used for reinforcing the connection between the connecting pipe (8) and the sleeve (10).

6. The ammonia injection grid according to claim 1, wherein: The material of the flow guide plate (11) is stainless steel, and the thickness thereof is 3-5 mm. The surface of the flow guide plate (11) is provided with a corrosion-resistant coating, and the thickness of the corrosion-resistant coating is not less than 0.1 mm.

7. The ammonia injection lattice of claim 6, wherein: The number of blades of the fan blade (14) and the fan blade (18) is 4-6, and the inclination angle of the blades is 30°-45°.

8. The ammonia injection lattice of claim 1, wherein: The material of the main pipe (1), the branch pipe (2), the connecting pipe (8) and the sleeve (10) is alloy steel.

9. The ammonia injection lattice according to any one of claims 1-8, characterized in that: The outer diameter of the sleeve (10) is 100-150 mm, and the diameter of the air outlet (20) and the air outlet (21) is 20-30 mm.

10. The ammonia injection grid of claim 9 wherein: ​

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