Adjustable denitration ammonia injection grid and scr reactor

Abstract

This invention relates to the field of ammonia injection grid adjustment technology, specifically to an adjustable denitrification ammonia injection grid and SCR reactor. It includes an ammonia gas delivery pipeline installed inside a flue, comprising multiple main gas delivery pipes arranged in a straight line. Each main gas delivery pipe has multiple branch pipes arranged in a staggered left-right pattern. A rotating fan is installed at the top of each branch pipe, and multiple air guide pipes are installed on the outer edge of the branch pipes to blow gas towards the rotating fan. This adjustable denitrification ammonia injection grid and SCR reactor, by controlling a rotating oscillating mechanism to push the movable bends within the target area, can ensure that sufficient ammonia gas is injected into the required ammonia injection area. Simultaneously, the blown ammonia gas can drive the rotating fan to rotate at a higher speed, increasing the mixing effect and improving the overall mixing efficiency. This ensures a more efficient reaction rate and reduces NO during the subsequent catalytic reaction in the SCR reactor. x escape.

Description

Technical Field

[0001] This invention relates to the field of ammonia injection grid adjustment technology, specifically to an adjustable denitrification ammonia injection grid and an SCR reactor. Background Technology

[0002] The SCR reactor is a core component of flue gas denitrification systems in coal-fired power plants and industrial boilers. It reduces the harmful pollution of the atmosphere by selectively reducing nitrogen oxides (NOx) with ammonia (NH3) to produce harmless nitrogen (N2). Ammonia is injected through a multi-point dispersion grid, breaking the ammonia flow into thousands of fine jets. The ammonia flow is then dispersed, and subsequent static mixing blades at the rear cut and twist the flue gas, creating strong turbulence and forcing the airflow to mix. NO is detected at the outlet flue gas. x Escape is achieved by analyzing the signal and controlling the jet volume of the ammonia injection grid to form a closed-loop regulation.

[0003] However, adjusting the spray volume makes it difficult to guarantee that the required amount of ammonia will be sprayed within the desired nitrogen injection area. Within a short distance of just a few meters, it's difficult to quickly mix the increased ammonia with the flue gas, ultimately leading to NO emissions. x escape.

[0004] Therefore, it is necessary to design an adjustable ammonia injection grid and SCR reactor for denitrification, which can ensure that sufficient ammonia gas is injected within the required injection area, while increasing the mixing effect and reducing NO. x escape. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the present invention aims to provide an adjustable ammonia injection grid and SCR reactor for denitrification, which can ensure sufficient ammonia gas is injected within the required injection zone, while simultaneously increasing mixing efficiency and reducing NO. x escape.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides an adjustable denitrification ammonia injection grid and an SCR reactor, including an ammonia gas delivery pipeline installed inside a flue. The ammonia gas delivery pipeline includes multiple main gas delivery pipes arranged in a straight line. Each main gas delivery pipe is provided with multiple branch pipes arranged in a staggered left-right pattern. A rotating fan is provided at the top of each branch pipe. Multiple air guide pipes are provided on the outer edge of the branch pipes. The multiple air guide pipes are used to blow air towards the rotating fan, so that the rotating fan is propelled by the airflow. The rotating, bifurcated pipe has an air guide pipe connected to its interior on its outer edge. The movable bend is rotatably installed at the end of the air guide pipe. The rotating swing mechanism is located between the left and right rows of bifurcated pipes. A movable gate is installed between the air guide pipe and the movable bend. When the rotating swing mechanism pushes one end of the movable bend to rotate so that it faces the rotating fan blowing air, the other end of the movable bend is coaxial with the air guide pipe, and the movable gate is in the open state. The ammonia gas discharged from the air guide pipe can flow into the movable bend. When the movable bend is not pushed, the movable gate is in the closed state.

[0007] Preferably, each movable gate includes a side plate and an arc-shaped gate plate. The arc-shaped gate plate is fixedly installed at one end of the movable bend pipe. The end of the air guide pipe has an arc-shaped structure and fits against the arc-shaped gate plate. The side plate is fixedly installed on the side of the arc-shaped gate plate. The side plate is rotatably connected to the air guide pipe, and the rotation axis of the side plate is coaxial with the axis of the arc-shaped gate plate.

[0008] Preferably, the rotating swing mechanism includes a swing arm, a horizontal pushing mechanism and a rotating track fixedly installed on the inner wall of the flue. The horizontal pushing mechanism is provided with a moving tube that can move horizontally. The swing arm is rotatably installed on the moving tube. One side of the swing arm is in contact with the rotating track. When the swing arm is in contact with the horizontal section, as shown in the figure, the end of the swing arm is located below the movable bend in the initial state. When the swing arm moves to the top of the rising section, the swing arm pushes the movable bend to rotate to a state where it is blowing air directly towards the rotating fan.

[0009] Preferably, there are multiple swing arms, and the distance between every two swing arms is the same as the distance between two adjacent branch pipes, and the adjacent two swing arms are staggered from left to right.

[0010] Preferably, the distance between any two adjacent ascending segments is equal to the distance between the two pendulum rods.

[0011] Preferably, the horizontal pushing mechanism includes a lead screw, a support guide column, and a connecting plate. The two ends of the support guide column are fixedly connected to the inner wall of the flue. The moving tube is sleeved on the outer edge of the support guide column. The connecting plate is fixedly installed on the top of the moving tube. A lead screw nut that meshes with the lead screw is provided inside the connecting plate. A drive motor for driving the lead screw to rotate is provided on the outer side of the flue.

[0012] Preferably, every two gas supply mains are fixedly connected by a central tube, and the two lead screws located above the two gas supply mains are connected by a sprocket assembly, with one of the lead screws connected to the drive motor.

[0013] Preferably, the rotating fan has an air chamber that communicates with the branch pipe. A retaining ring 1 is fixedly installed at the bottom of the rotating fan, and a retaining ring 2 is fixedly installed at the top of the branch pipe. An annular retaining seat is engaged between retaining ring 2 and retaining ring 1, and the inner edge height of the annular retaining seat is greater than the combined thickness of retaining ring 1 and retaining ring 2.

[0014] A reactor, wherein the adjustable denitrification ammonia spraying grid is provided in the upstream process of the reactor.

[0015] The beneficial effects of this invention are as follows: The adjustable ammonia injection grid and SCR reactor, by controlling the rotating oscillating mechanism to push the movable bend within the target area, can ensure that sufficient ammonia gas is injected into the required ammonia injection area. Simultaneously, the injected ammonia gas can drive the rotary fan to rotate at a higher speed, increasing the mixing effect and improving the overall mixing efficiency. This ensures a more efficient reaction rate and reduces NO during the subsequent catalytic reaction in the SCR reactor. x escape. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the front view of the present invention.

[0018] Figure 2 This is a partial front view of the present invention.

[0019] Figure 3 This is the front view of the present invention before 2D rotation.

[0020] Figure 4 This is the front view of the invention after 2D rotation.

[0021] Figure 5 This is a schematic diagram showing the installation status of the movable gate.

[0022] Figure 6 This is a three-dimensional structural diagram of a rotary swing mechanism.

[0023] Figure 7 This is a three-dimensional structural diagram of an ammonia gas transmission pipeline.

[0024] Figure 8 This is a cross-sectional view of a rotating fan.

[0025] Explanation of reference numerals in the attached diagram: 1. Flue; 2. Ammonia gas transmission pipeline; 2a. Main gas transmission pipe; 2b. Branching pipe; 2c. Gas outlet bend; 2d. Movable bend; 2e. Gas guide pipe; 2f. Movable gate; 2f1. Side plate; 2f2. Arc-shaped gate; 2h. Middle pipe; 2j. Clamping ring two; 3. Rotary fan; 3a. Clamping ring one; 3b. Gas filling chamber; 4. Rotary swing mechanism; 4a. Horizontal pushing mechanism; 4a1. Moving pipe; 4a2. Screw; 4a3. Support guide column; 4a4. Connecting plate; 4b. Rotary track; 4b1. Ascending section; 4b2. Horizontal section; 4c. Swing rod; 5. Annular clamp. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: This invention provides an adjustable ammonia injection grid for denitrification and an SCR reactor, such as... Figure 1-8 As shown, the system includes an ammonia gas delivery pipe 2 installed inside the flue 1. The ammonia gas delivery pipe 2 includes multiple main gas delivery pipes 2a arranged in a straight line. Each main gas delivery pipe 2a is provided with multiple branch pipes 2b arranged in a staggered pattern. Each branch pipe 2b has a rotating fan 3 at its top. Multiple air guide pipes 2e are provided on the outer edge of the branch pipes 2b. The multiple air guide pipes 2e are used to blow air towards the rotating fan 3, causing the rotating fan 3 to rotate due to the airflow. The outer edge of the branch pipes 2b is also provided with air guide pipes 2 that communicate with its interior. e. The movable bend 2d is rotatably installed at the end of the air guide pipe 2e. The rotating swing mechanism 4 is located between the left and right rows of branched pipes 2b. A movable gate 2f is provided between the air guide pipe 2e and the movable bend 2d. When the rotating swing mechanism 4 pushes one end of the movable bend 2d to rotate so that it faces the rotating fan 3 to blow air, the other end of the movable bend 2d is coaxial with the air guide pipe 2e, and the movable gate 2f is in the open state. The ammonia gas discharged from the air guide pipe 2e can flow into the movable bend 2d. When the movable bend 2d is not pushed, the movable gate 2f is in the closed state. Figure 3 As shown, the movable bend 2d is in its position before being pushed, as... Figure 4As shown, the movable bend 2d is in its final position after being pushed and rotated, with one end of the movable bend 2d facing the rotary fan 3. When nitrogen needs to be injected into a certain area, the movable bend 2d in the corresponding area is driven to rotate by controlling the rotary swing mechanism 4. The movable bend 2d is pushed to a position where its end faces the rotary fan 3, and at the same time, the movable gate 2f is opened. Due to the increase in the gas outlet, the branch pipe 2b can draw in more ammonia from the main gas supply pipe 2a, and the increased ammonia will be discharged from the movable bend 2d. This achieves the spraying of sufficient ammonia in the required ammonia injection area, and the discharged ammonia can be blown towards the rotary fan 3, increasing the driving force on the rotary fan 3, thereby increasing the rotation speed of the rotary fan 3, improving the mixing effect, and reducing NO. x escape.

[0028] Each movable gate 2f includes a side plate 2f1 and an arc-shaped gate 2f2. The arc-shaped gate 2f2 is fixedly installed at one end of the movable bend 2d. The end of the air guide pipe 2e has an arc-shaped structure and fits against the arc-shaped gate 2f2. The side plate 2f1 is fixedly installed on the side of the arc-shaped gate 2f2. The side plate 2f1 is rotatably connected to the air guide pipe 2e, and the rotation axis of the side plate 2f1 is coaxial with the axis of the arc-shaped gate 2f2. When the movable bend 2d rotates downward, the end of the movable bend 2d will be offset from the air guide pipe 2e, and the arc-shaped gate 2f2 will cover the end of the air guide pipe 2e, preventing gas from escaping from the air guide pipe 2e. When the end of the movable bend 2d is coaxial with the air guide pipe 2e, the end of the air guide pipe 2e is in an open state, and exhaust gas will enter the movable bend 2d from the air guide pipe 2e. The ends of the movable bend 2d and the exhaust bend 2c are not limited to circular shapes; they can also be conical structures to increase the blowing intensity of the exhaust air and increase the rotation speed of the rotary fan 3.

[0029] The rotating swing mechanism 4 includes a swing rod 4c, a horizontal pushing mechanism 4a fixedly installed on the inner wall of the flue 1, and a rotating track 4b. The horizontal pushing mechanism 4a is equipped with a horizontally movable tube 4a1. The swing rod 4c is rotatably mounted on the movable tube 4a1. One side of the swing rod 4c contacts the rotating track 4b. When the swing rod 4c contacts the horizontal section 4b2, as... Figure 3As shown, the end of the swing arm 4c is located below the movable bend 2d in its initial state. When the swing arm 4c moves to the top of the rising section 4b1, it pushes the movable bend 2d to rotate so that it faces the rotating fan 3 and blows air. It is important to note that the side of the swing arm 4c only contacts the rising section 4b1 after inserting into the bottom of the movable bend 2d. During subsequent movement, the swing arm 4c slowly rises to push the movable bend 2d to rotate. Alternatively, the length of the swing arm 4c can be reduced to allow for some upward movement. When the horizontal pushing mechanism 4a is working, it only drives the moving tube 4a1 to move horizontally, which in turn pushes the swing arm 4c to move. During this movement, when it encounters the rising section 4b1, it pushes the corresponding movable bend 2d to rise.

[0030] There are multiple swing arms 4c, and the distance between any two swing arms 4c is the same as the distance between two adjacent branch pipes 2b, with adjacent swing arms 4c arranged in a staggered pattern. When the moving pipe 4a1 is pushed to a certain displacement, all swing arms 4c will simultaneously contact the rising section 4b1, simultaneously pushing the movable bend pipe 2d to rotate upwards. The number of swing arms 4c determines the size of the interval, such as... Figure 2 The marked section A uses two 4c pendulum rods.

[0031] The distance between any two adjacent ascending segments 4b1 is equal to the distance between the two pendulum rods 4c. This equal distance allows the ascending segments 4b1 to simultaneously lift multiple pendulum rods 4c.

[0032] The horizontal pushing mechanism 4a includes a lead screw 4a2, a support guide column 4a3, and a connecting plate 4a4. Both ends of the support guide column 4a3 are fixedly connected to the inner wall of the flue 1. The moving tube 4a1 is sleeved on the outer edge of the support guide column 4a3. The connecting plate 4a4 is fixedly installed on the top of the moving tube 4a1. A lead screw nut that meshes with the lead screw 4a2 is provided inside the connecting plate 4a4. A drive motor for driving the lead screw 4a2 to rotate is provided on the outer side of the flue 1. By controlling the drive motor, the lead screw 4a2 pushes the connecting plate 4a4 to move horizontally through engagement. The connecting plate 4a4 then pushes the moving tube 4a1 to slide horizontally along the support guide column 4a3, thereby driving the swing arm 4c to move horizontally.

[0033] Two main gas supply pipes 2a are fixedly connected by a central pipe 2h. Two lead screws 4a2 located above the two main gas supply pipes 2a are connected by a sprocket assembly. One of the lead screws 4a2 is connected to the drive motor. Figure 2 As shown, this connection method can extend its overall length in the width direction, thereby increasing the adjustable area each time. It can be designed according to the size of flue 1.

[0034] The rotary fan 3 has an inflation chamber 3b connected to the branch pipe 2b. A retaining ring 3a is fixedly mounted at the bottom of the rotary fan 3, and a retaining ring 2j is fixedly mounted at the top of the branch pipe 2b. An annular retaining seat 5 is engaged between retaining ring 2j and retaining ring 3a, with the inner edge height of the annular retaining seat 5 exceeding the combined thickness of retaining rings 3a and 2j. Gas from inside the branch pipe 2b enters the inflation chamber 3b. The lifting effect of the gas creates a gap between retaining ring 3a and retaining ring 2j, reducing friction. When ammonia gas drives the rotary fan 3 to rotate, retaining ring 3a rotates along the inner edge of the annular retaining seat 5. The clamping effect of the annular retaining seat 5 on retaining rings 3a and 2j prevents ammonia gas from escaping through the gap. The design of the inflation chamber 3b reduces the volume of the rotary fan 3, making it easier to lift.

[0035] An SCR reactor, wherein the adjustable ammonia injection grid for denitrification is provided as a pre-process step. The adjustable ammonia injection grid for denitrification is provided as a pre-process step.

[0036] During use, ammonia gas discharged through ammonia delivery pipe 2 is allowed to exit via branch pipe 2b and then along outlet bend 2c. When the rear sensor detects NO in a corresponding area... x During the escape, the swing arm 4c is pushed by the rotating swing mechanism 4 to approach the movable curved tube 2d in the target area. When it moves to the final position, the swing arm 4c pushes the movable curved tube 2d upward and rotates during the movement. When it moves to the final position, the movable curved tube 2d blows air directly into the rotating fan 3.

[0037] This adjustable ammonia injection grid and SCR reactor, by controlling the rotating oscillating mechanism 4 to push the movable bend 2d within the target area, ensures that sufficient ammonia gas is injected into the required ammonia injection area. Simultaneously, the injected ammonia gas drives the rotating fan 3 to rotate at a higher speed, increasing the mixing effect and improving the overall mixing efficiency. This ensures a more efficient reaction rate and reduces NO during the subsequent catalytic reaction in the SCR reactor. x escape.

[0038] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An adjustable ammonia spray bar for denitrification, characterized in that, The ammonia delivery pipe (2) is installed inside the flue (1). The ammonia delivery pipe (2) includes multiple main gas delivery pipes (2a) arranged in a straight line. Each main gas delivery pipe (2a) is provided with multiple branch pipes (2b) arranged in a staggered manner. Each branch pipe (2b) is equipped with a rotating fan (3) at the top. Multiple air guide pipes (2e) are provided on the outer edge of the branch pipes (2b). The multiple air guide pipes (2e) are used to blow air towards the rotating fan (3), so that the rotating fan (3) is driven to rotate by the airflow. The outer edge of the branch pipes (2b) is also provided with air guide pipes (2e) that communicate with its interior. The movable bend (2d) is rotatably installed at the end of the air guide pipe (2e). The rotating swing mechanism (4) is located between the two rows of branch pipes (2b). A movable gate (2f) is provided between the air guide pipe (2e) and the movable bend (2d). When the rotating swing mechanism (4) pushes one end of the movable bend (2d) to rotate to face the rotating fan (3) to blow air, the other end of the movable bend (2d) is coaxial with the air guide pipe (2e), and the movable gate (2f) is in the open state. The ammonia gas discharged from the air guide pipe (2e) can flow into the movable bend (2d). When the movable bend (2d) is not pushed, the movable gate (2f) is in the closed state.

2. The adjustable denitrification ammonia spraying grid as described in claim 1, characterized in that, Each movable gate (2f) includes a side plate (2f1) and an arc-shaped gate (2f2). The arc-shaped gate (2f2) is fixedly installed at one end of the movable bend (2d). The end of the air guide pipe (2e) has an arc-shaped structure and fits against the arc-shaped gate (2f2). The side plate (2f1) is fixedly installed on the side of the arc-shaped gate (2f2). The side plate (2f1) is rotatably connected to the air guide pipe (2e), and the rotation axis of the side plate (2f1) is coaxial with the axis of the arc-shaped gate (2f2).

3. An adjustable denitrification ammonia spraying grid as described in claim 1 or 2, characterized in that, The rotating swing mechanism (4) includes a swing rod (4c), a horizontal pushing mechanism (4a) and a rotating track (4b) fixedly installed on the inner wall of the flue (1). The horizontal pushing mechanism (4a) is provided with a moving tube (4a1) that can move horizontally. The swing rod (4c) is rotatably installed on the moving tube (4a1). One side of the swing rod (4c) is in contact with the rotating track (4b). When the swing rod (4c) is in contact with the horizontal section (4b2), as shown in Figure 3, the end of the swing rod (4c) is located below the movable bend (2d) in the initial state. When the swing rod (4c) moves to the top of the rising section (4b1), the swing rod (4c) pushes the movable bend (2d) to rotate to the state of blowing air directly in front of the rotating fan (3).

4. An adjustable ammonia spray bar for denitrification as described in claim 3, characterized in that, There are multiple swing arms (4c), and the distance between any two swing arms (4c) is the same as the distance between two adjacent branch pipes (2b), and the two adjacent swing arms (4c) are staggered from left to right.

5. An adjustable ammonia spray bar for denitrification as described in claim 4, characterized in that, The distance between any two adjacent ascending segments (4b1) is equal to the distance between the two pendulum rods (4c).

6. An adjustable ammonia spray bar for denitrification as described in claim 3, characterized in that, The horizontal pushing mechanism (4a) includes a lead screw (4a2), a support guide column (4a3), and a connecting plate (4a4). The two ends of the support guide column (4a3) are fixedly connected to the inner wall of the flue (1). The moving tube (4a1) is sleeved on the outer edge of the support guide column (4a3). The connecting plate (4a4) is fixedly installed on the top of the moving tube (4a1). A lead screw nut that meshes with the lead screw (4a2) is provided inside the connecting plate (4a4). A drive motor for driving the lead screw (4a2) to rotate is provided on the outside of the flue (1).

7. An adjustable denitrification ammonia spraying grid as described in claim 1, characterized in that, The two gas supply pipes (2a) are fixedly connected by a middle pipe (2h), and the two lead screws (4a2) located above the two gas supply pipes (2a) are connected by a sprocket set, and one of the lead screws (4a2) is connected to the drive motor.

8. An adjustable ammonia spray bar for denitrification as described in claim 1, characterized in that, The rotating fan (3) has an air chamber (3b) that communicates with the branch pipe (2b). A retaining ring 1 (3a) is fixedly installed at the bottom of the rotating fan (3), and a retaining ring 2 (2j) is fixedly installed at the top of the branch pipe (2b). An annular retaining seat (5) is fitted between retaining ring 2 (2j) and retaining ring 1 (3a). The inner edge height of the annular retaining seat (5) is greater than the superimposed thickness of retaining ring 1 (3a) and retaining ring 2 (2j).

9. An SCR reactor, characterized in that, The SCR reactor pre-process is equipped with an adjustable denitrification ammonia spraying grid as described in any one of claims 1-8.

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