Spiral nozzle type ammonia injection grid ammonia uniform distribution deflector plate

Abstract

The utility model relates to the technical field of flow guide plate, disclose spiral nozzle type ammonia grid ammonia gas even distribution flow guide plate, including flue casing, the ammonia gas pipeline is fixedly connected with the flue casing middle side outer wall, the ammonia gas pipeline surface is fixedly connected with the ammonia grid, the ammonia grid and the fixed connection between flue casing inner wall, the spiral nozzle is evenly distributed in the ammonia grid top, the honeycomb flow guide plate and flow velocity sensor are fixedly connected with the flue casing middle side inner wall, the flue casing right side top is provided with the air inlet, the flue casing left side bottom fixedly connected with the reaction chamber. In the utility model, through the common effect of honeycomb flow guide plate and spiral nozzle realizes the acceleration rectification to ammonia gas, sets up flow velocity sensor through the honeycomb flow guide plate export, linkage spiral nozzle on the surface of ammonia grid, realizes the dynamic matching of flow velocity and ammonia injection amount, improves the denitration efficiency to flue gas.

Description

Technical Field

[0001] This utility model relates to the field of guide plate technology, and in particular to a spiral nozzle type ammonia injection grid guide plate for uniform ammonia gas distribution. Background Technology

[0002] Flue gas denitrification refers to the process of removing nitrogen oxides from industrial flue gas through physical and chemical methods, thereby reducing nitrogen oxide emissions and lowering atmospheric pollution. SCR technology is widely used due to its high denitrification efficiency. In an SCR denitrification system, ammonia is injected into the flue gas to undergo a reduction reaction under the action of a catalyst, producing nitrogen and water. The ammonia injection grid is a key component for achieving uniform injection of the reducing agent. To adjust the flow direction and velocity distribution of ammonia, baffles are usually installed inside the grid pipe or at the outlet to assist in the uniform distribution of ammonia, so that ammonia and flue gas can be more uniformly mixed before entering the catalyst layer, thereby improving the efficiency and consistency of the denitrification reaction and avoiding the increase in ammonia escape due to local excess ammonia or the decrease in denitrification efficiency due to local deficiency.

[0003] In existing technologies, ammonia injection grids typically use direct injection nozzles or fan-shaped nozzles to inject ammonia gas. The ammonia gas is then guided into the catalytic reaction chamber by a guide plate. In this process, the ammonia gas flow rate is poorly improved and integrated. At the same time, the amount of ammonia injected cannot be dynamically adjusted according to the real-time flow rate, which can easily affect the flue gas denitrification efficiency. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate, which aims to improve the problem of poor ammonia gas flow rate regulation capability in the existing technology, resulting in low denitrification efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate, including a flue shell, an ammonia gas pipe fixedly connected to the outer wall of the middle side of the flue shell, an ammonia injection grid fixedly connected to the surface of the ammonia gas pipe, the ammonia injection grid being fixedly connected to the inner wall of the flue shell, spiral nozzles uniformly distributed at the top of the ammonia injection grid, a honeycomb guide plate and a flow rate sensor fixedly connected to the inner wall of the middle side of the flue shell, an air inlet opened at the top right side of the flue shell, a reaction chamber fixedly connected to the bottom left side of the flue shell, and an adjustment mechanism provided on the inner wall of the flue shell.

[0006] Preferably, the adjustment mechanism includes a connecting frame, which is fixedly connected to the inner wall of the flue housing. An arc-shaped guide plate one and an arc-shaped guide plate two are rotatably connected to the inner wall of the connecting frame. A first transmission rod is rotatably connected to the right surface of the arc-shaped guide plate one. A first crank is rotatably connected to the right end of the first transmission rod. A connecting column is rotatably connected to the inner wall of the rear side of the first crank.

[0007] Preferably, a connecting rod is rotatably connected to the surface of the connecting column, and a second crank is rotatably connected to the end of the connecting rod. Fixed columns are rotatably connected to the inner walls of both the first and second cranks, and the top end is fixedly connected to the inner wall of the flue housing.

[0008] Preferably, the top end of the connecting column is slidably connected to the inner wall of the flue housing, a cylinder is fixedly connected to the inner wall of the flue housing, a piston is slidably connected to the inner wall of the cylinder, and the top end of the piston is fixedly connected to the connecting column.

[0009] Preferably, a dust collection hopper is provided at the bottom of the inner wall of the flue shell, which is used to prevent dust carried by flue gas from accumulating.

[0010] Preferably, the inner wall of the reaction chamber is uniformly distributed with a denitrification catalyst layer, and the bottom of the reaction chamber is fixedly connected with an outlet.

[0011] Preferably, both the first and second arc-shaped guide plates are made of silicon nitride ceramic material, and a groove is provided on the rear side of the connecting frame.

[0012] Preferably, a second transmission rod is rotatably connected to the right side surface of the arc-shaped guide plate, and the second transmission rod is rotatably connected to the connecting column.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the honeycomb guide plate and the spiral nozzle work together to accelerate and rectify the ammonia gas, thereby improving the uniformity of ammonia gas distribution in the flue. By setting a flow rate sensor at the outlet of the honeycomb guide plate, the spiral nozzle on the surface of the ammonia injection grid is linked to achieve dynamic matching of flow rate and ammonia injection amount, thereby improving the denitrification efficiency of the flue gas.

[0015] 2. In this utility model, the cylinder controls the movement of the connecting column, which drives the crank to rotate on the fixed column. Since the transmission rod is rotatably connected to the crank and the arc-shaped guide plate, the crank can drive the arc-shaped guide plate to change its angle, thereby realizing the adjustment of the angle of the arc-shaped guide plate by the cylinder, and further ensuring the uniform mixing of ammonia and flue gas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flue shell connection of the spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate proposed in this utility model.

[0017] Figure 2 This is a schematic cross-sectional view of the flue shell of the spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate proposed in this utility model.

[0018] Figure 3This is a schematic diagram showing the connection of the adjustment mechanism of the spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate proposed in this utility model.

[0019] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0020] Legend:

[0021] 1. Flue shell; 2. Ammonia pipeline; 3. Reaction chamber; 4. Gas outlet; 5. Ash collection hopper; 6. Ammonia injection grid; 7. Denitrification catalyst layer; 8. Connecting frame; 9. Spiral nozzle; 10. Honeycomb guide plate; 11. Flow rate sensor; 12. Arc-shaped guide plate one; 13. Cylinder; 14. Connecting column; 15. Connecting rod; 16. First crank; 17. First transmission rod; 18. Second transmission rod; 19. Arc-shaped guide plate two; 20. Second crank. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1-3 An embodiment of this utility model is provided: a spiral nozzle type ammonia injection grid ammonia gas uniform distribution guide plate, including a flue shell 1, an ammonia gas pipe 2 fixedly connected to the outer wall of the middle side of the flue shell 1, an ammonia injection grid 6 fixedly connected to the surface of the ammonia gas pipe 2, an ammonia injection grid 6 fixedly connected to the inner wall of the flue shell 1, a spiral nozzle 9 evenly distributed at the top of the ammonia injection grid 6, a honeycomb guide plate 10 and a flow rate sensor 11 fixedly connected to the inner wall of the middle side of the flue shell 1, an air inlet is opened at the top right side of the flue shell 1, a reaction chamber 3 is fixedly connected to the bottom left side of the flue shell 1, and an adjustment mechanism is provided on the inner wall of the flue shell 1;

[0024] The spiral nozzle 9 can form a wider conical diffusion surface, making the initial distribution of ammonia gas in the flue more uniform. The main body of the guide plate is made of silicon nitride ceramic material, which has good adaptability in high-temperature flue operation environment. The surface is coated with polytetrafluoroethylene to resist strong acid corrosion. The honeycomb guide plate 10 divides the flue section into several small channels through a dense porous structure. When the total flow area is reduced, the average flow velocity of the airflow can be increased. The straight wall surface of the honeycomb holes can force the airflow to flow along the direction of the holes, which can suppress secondary flow in the corner of the flue and reduce the standard deviation of the flow velocity distribution. The flow velocity sensor 11 can monitor the airflow velocity at the outlet of the honeycomb guide plate 10 in real time and feed the data back to the control system. The spiral nozzle 9 on the surface of the ammonia injection grid 6 is linked to dynamically adjust the ammonia injection amount according to the flow velocity change, thereby forming a closed-loop matching mechanism between flow velocity and ammonia injection amount, ensuring that the ammonia injection amount is adapted to the flue gas flow state under different operating conditions.

[0025] Reference Figure 4 The adjustment mechanism includes a connecting frame 8, which is fixedly connected to the inner wall of the flue shell 1. An arc-shaped guide plate 12 and an arc-shaped guide plate 2 19 are rotatably connected to the inner wall of the connecting frame 8. A first transmission rod 17 is rotatably connected to the right surface of the arc-shaped guide plate 12. A first crank 16 is rotatably connected to the right end of the first transmission rod 17. A connecting column 14 is rotatably connected to the inner wall of the rear side of the first crank 16.

[0026] The regulating mechanism uses an elliptical cross-section connecting rod to reduce the drag coefficient. The first crank 16 and the first transmission rod 17 are arranged in the area behind the connecting frame 8 near the wall, which is the low-speed zone of the flue section. This can further reduce the interference of the regulating mechanism on the flow field. The arc-shaped guide plate and the transmission rod, as well as the connection between the transmission rod and the crank, all adopt a spherical joint structure, which allows the transmission rod to move at multiple angles when pushing the arc-shaped guide plate, thereby realizing the angle adjustability of the arc-shaped guide plate.

[0027] Reference Figure 4 A connecting rod 15 is rotatably connected to the surface of the connecting column 14, and a second crank 20 is rotatably connected to the end of the connecting rod 15. Fixed columns are rotatably connected to the inner walls of the first crank 16 and the second crank 20, and their top ends are fixedly connected to the inner wall of the flue housing 1. The motion relationship between the first crank 16 and the second crank 20 follows the parallelogram principle. When the connecting column 14 moves linearly under the drive of the cylinder 13, the first crank 16 moves in a circular motion around its fixed column. The motion is transmitted to the second crank 20 through the connecting rod 15, so that the second crank 20 rotates synchronously around its fixed column, thereby ensuring that the arc-shaped guide plate can dynamically adjust the guide angle according to the changes in flue gas flow rate and velocity.

[0028] Reference Figure 4The top of the connecting column 14 is slidably connected to the inner wall of the flue housing 1. A cylinder 13 is fixedly connected to the inner wall of the flue housing 1. A piston is slidably connected to the inner wall of the cylinder 13. The top of the piston is fixedly connected to the connecting column 14. A guide rail can be embedded between the top of the connecting column 14 and the inner wall of the flue housing 1 to assist sliding. By controlling the displacement of the connecting column 14 through the cylinder 13, the angles of the arc-shaped guide plate 12 and the arc-shaped guide plate 19 can be adjusted to ensure the best mixing effect of ammonia and flue gas under different working conditions.

[0029] Reference Figure 2 A dust collection hopper 5 is provided at the bottom of the inner wall of the flue shell 1. The dust collection hopper 5 is used to prevent dust carried by flue gas from accumulating. When the flue gas carrying dust flows through the area of ​​the dust collection hopper 5, the dust will naturally settle into the dust collection hopper 5 under the action of gravity, and will not form an accumulation layer at the bottom of the flue. This solves the problem of dust accumulation affecting the guide plate, and can also reduce the wear of dust on the spiral nozzle 9 and honeycomb guide plate 10, and extend the overall service life of the equipment.

[0030] Reference Figure 2 The inner wall of the reaction chamber 3 is uniformly distributed with denitrification catalyst layers 7. The bottom of the reaction chamber 3 is fixedly connected with an outlet 4. Each denitrification catalyst layer 7 is fixed to the inner wall of the reaction chamber 3 with a detachable frame. The frame edge is equipped with sealing strips to prevent flue gas short circuit. Gaps are reserved between modules for maintenance, so as to realize the regular replacement and maintenance of the denitrification catalyst layer 7 and extend its service life.

[0031] Reference Figure 4 Both the arc-shaped guide plate 12 and the arc-shaped guide plate 19 are made of silicon nitride ceramic material. The connecting frame 8 has a groove on the rear side. The silicon nitride ceramic material has good high-temperature mechanical properties and chemical stability, which can resist the impact load of high-temperature airflow in the flue and reduce thermal stress damage during drastic temperature changes. It further enhances the resistance to molten ash erosion and avoids changes in the flow channel shape caused by material corrosion in acidic flue gas environment.

[0032] Reference Figure 4 The second transmission rod 18 is rotatably connected to the right surface of the second arc-shaped guide plate 19. The second transmission rod 18 is rotatably connected to the connecting column 14. Connecting frames 8 and fixed columns are provided on both sides of the inner wall of the flue shell 1. The connecting frames 8 and fixed columns are symmetrically arranged on both sides of the inner wall of the flue shell 1. The axis of the fixed column is perpendicular to the cross-section of the flue, providing a stable rotation fulcrum for the first crank 16 and the second crank 20. When the cylinder 13 drives the connecting column 14 to move, the first arc-shaped guide plate 12 and the second arc-shaped guide plate 19 on both sides rotate synchronously to ensure the consistency of airflow regulation in the flue cross-section.

[0033] Working principle: The arc-shaped guide plate 12 and the arc-shaped guide plate 19 force the high-speed airflow to deflect to both sides, and achieve radial diffusion by utilizing the characteristics of fluid adhering to the curved surface, accelerating the mixing of ammonia and flue gas. The honeycomb guide plate 10 and the arc-shaped guide plate realize the acceleration, rectification and diffusion mixing of ammonia, thereby improving the uniformity of ammonia distribution. The flow rate sensor 11 is set at the outlet of the honeycomb guide plate 10, which is linked to the spiral nozzle 9 on the surface of the ammonia injection grid 6 to achieve dynamic matching of flow rate and ammonia injection volume.

[0034] Regarding the adjustment of the angles of the first arc-shaped guide plate 12 and the second arc-shaped guide plate 19, the first crank 16 and the second crank 20 can rotate together on the fixed column by controlling the movement of the connecting column 14 through the cylinder 13. Since the transmission rod is rotatably connected to the crank and the arc-shaped guide plate through a ball joint, the crank can drive the arc-shaped guide plate to change its angle, thereby realizing the control of the angles of the first arc-shaped guide plate 12 and the second arc-shaped guide plate 19 by the cylinder 13, further ensuring the uniform mixing of ammonia and flue gas.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Spiral nozzle type ammonia injection grid ammonia gas uniform distribution deflector plate, comprising a flue shell (1), characterized in that: An ammonia pipe (2) is fixedly connected to the outer wall of the flue shell (1). An ammonia spraying grid (6) is fixedly connected to the surface of the ammonia pipe (2). The ammonia spraying grid (6) is fixedly connected to the inner wall of the flue shell (1). Spiral nozzles (9) are evenly distributed at the top of the ammonia spraying grid (6). A honeycomb guide plate (10) and a flow rate sensor (11) are fixedly connected to the inner wall of the flue shell (1). An air inlet is opened at the top right side of the flue shell (1). A reaction chamber (3) is fixedly connected to the bottom left side of the flue shell (1). An adjustment mechanism is provided on the inner wall of the flue shell (1).

2. The spiral nozzle type ammonia injection grid ammonia uniform distribution deflector according to claim 1, characterized in that: The adjustment mechanism includes a connecting frame (8), which is fixedly connected to the inner wall of the flue shell (1). The inner wall of the connecting frame (8) is rotatably connected to an arc-shaped guide plate one (12) and an arc-shaped guide plate two (19). The right side surface of the arc-shaped guide plate one (12) is rotatably connected to a first transmission rod (17). The right end of the first transmission rod (17) is rotatably connected to a first crank (16). The inner wall of the rear side of the first crank (16) is rotatably connected to a connecting column (14).

3. The spiral nozzle type ammonia injection grid ammonia uniform distribution deflector according to claim 2, characterized in that: The connecting column (14) is rotatably connected to a connecting rod (15), and the end of the connecting rod (15) is rotatably connected to a second crank (20). The inner walls of the first crank (16) and the second crank (20) are both rotatably connected to fixed columns, and the top end is fixedly connected to the inner wall of the flue housing (1).

4. The spiral nozzle type ammonia injection grid ammonia uniform distribution deflector according to claim 2, characterized in that: The top of the connecting column (14) is slidably connected to the inner wall of the flue housing (1). A cylinder (13) is fixedly connected to the inner wall of the flue housing (1). A piston is slidably connected to the inner wall of the cylinder (13). The top of the piston is fixedly connected to the connecting column (14).

5. The spiral nozzle ammonia injection grid ammonia uniform distribution deflector according to claim 1, characterized in that: The bottom of the inner wall of the flue shell (1) is provided with a dust collection hopper (5), which is used to prevent dust carried by flue gas from accumulating.

6. The spiral nozzle ammonia injection grid ammonia uniform distribution deflector according to claim 1, characterized in that: The inner wall of the reaction chamber (3) is uniformly distributed with a denitrification catalyst layer (7), and the bottom of the reaction chamber (3) is fixedly connected with an outlet (4).

7. The spiral nozzle ammonia injection grid ammonia uniform distribution deflector according to claim 2, characterized in that: Both the first arc-shaped guide plate (12) and the second arc-shaped guide plate (19) are made of silicon nitride ceramic material, and the connecting frame (8) has a groove on the rear side.

8. The spiral nozzle ammonia injection grid ammonia uniform distribution deflector according to claim 2, characterized in that: The second transmission rod (18) is rotatably connected to the right side surface of the arc-shaped guide plate (19), and the second transmission rod (18) is rotatably connected to the connecting column (14).

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