A boiler sncr lance that facilitates replacement

Abstract

The utility model relates to a boiler SNCR spray gun convenient to replace, including gun body, the front end of gun body is connected with the gun head, still include connecting piece and fixed clamp, connecting piece includes sleeve pipe, and the flange plate and circular plate connected in the both ends of sleeve pipe, the flange plate is connected with boiler wall flange, the gun body is equipped with the fixed plate matched with circular plate, the shape of fixed clamp is matched with circular plate and fixed plate, fixed clamp includes a pair of semicircle clamp of hinge connection, and is used for the lock catch device of fixed clamp opening and closing, semicircle clamp includes the face hoop board of circular arc, the side hoop board with locking hook connected in the both sides of face hoop board, locking hook is equipped with the first guide surface of arc towards the inside of side hoop board, have realized only need fixed clamp to tighten and connect circular plate and fixed plate, simultaneously, the first guide surface of locking hook extrudes circular plate, cooperates with the side hoop board of other side, extrudes fixed plate and sticks together to circular plate, need not additional force and press tightly two, satisfy the convenience demand of quick dismounting spray gun.

Description

Technical Field

[0001] This invention relates to the field of SNCR denitrification spray gun technology, and more particularly to a boiler SNCR spray gun that is easy to replace. Background Technology

[0002] SNCR, or Selective Non-Catalytic Reduction, typically uses ammonia, urea, or hydrocyanic acid as a reducing agent to reduce NOx. The reducing agent reacts only with NOx in the flue gas without a catalyst, hence the name. This method requires a denitrification spray gun installed on the boiler wall to spray the reducing agent into the furnace. Existing denitrification spray guns use silicon carbide nozzles to improve high-temperature resistance and chemical corrosion resistance. However, silicon carbide nozzles are brittle and have poor impact resistance, easily breaking under the impact of airflow within the boiler. Furthermore, the spray gun is fixed to the boiler wall via flanges, requiring the removal of multiple bolts to reconnect and remove the nozzle when replacing a damaged nozzle. This makes disassembly, assembly, and maintenance cumbersome and fails to meet the needs for convenient on-site maintenance, rapid disassembly, and replacement. Therefore, designing a boiler SNCR spray gun that simplifies the replacement process, has strong impact resistance, and is easy to replace has become an urgent technical problem to solve. Summary of the Invention

[0003] To solve the above problems, the present invention provides a boiler SNCR spray gun that is easy to replace.

[0004] The present invention provides a boiler SNCR spray gun that is easy to replace, comprising a gun body, a gun head connected to the front end of the gun body, a compressed air inlet and a reducing agent inlet at the rear end, and a connector and a fixing clamp. The connector includes a sleeve and a flange plate and a circular plate connected to both ends of the sleeve. The flange plate is connected to the boiler wall flange. The gun body is provided with a fixing plate that matches the circular plate. The shape of the fixing clamp matches the circular plate and the fixing plate. The fixing clamp includes a pair of semi-circular clamps that are hinged together and a locking device for fixing the opening and closing of the clamp. The semi-circular clamp includes an arc-shaped face plate, side plates connected to both sides of the face plate and a locking hook. The locking hook has an arc-shaped first guide surface facing the inner side of the side plate.

[0005] With the above structure, by connecting the flange plate to the boiler wall flange, the nozzle at the front end of the nozzle body passes through the sleeve and enters the boiler. The fixing plate on the nozzle body overlaps with the circular plate. Then, the fixing clamp is opened and closed so that the semi-circular clamp simultaneously clamps the circular plate and the fixing plate. The arc-shaped face clamp plate fits against the circumferential surface of the circular plate and the fixing plate, and the side clamp plate is aligned with the exposed side of the fixing plate. At this time, an arc-shaped first guide surface is provided on the inner side of the side clamp plate through the locking hook. The part of the first guide surface farther from the side clamp plate first abuts against the edge of the circular plate. There is a gap between the side clamp plate and the fixing plate. The size of the gap corresponds to the curvature of the first guide surface. As the locking device gradually tightens the fixing clamp, As the locking hook moves closer to the sleeve, the first guide surface presses against the circular plate, causing the side clamp plate to fit and press against the fixed plate. This, in turn, presses the fixed plate and the circular plate tightly together, creating a sealed connection between the gun body and the connector. If the nozzle of the spray gun is damaged, simply open the locking device to loosen the fixing clamp, pull the gun body out of the sleeve, and the nozzle at the front end can be removed for replacement, making the operation more convenient. This achieves the goal of connecting the circular plate and the fixed plate simply by tightening the fixing clamp, while the first guide surface of the locking hook presses against the circular plate, cooperating with the side clamp plate on the other side to press the fixed plate against the circular plate. No additional force is required to press the two together, meeting the need for quick and easy disassembly and assembly of the spray gun.

[0006] As a further improvement of this utility model, one end of the semi-circular clamp is axially connected to each other, and the other end is respectively provided with an upper locking plate and a lower locking plate. When the clamp is not closed, the upper locking plate and the lower locking plate are in contact. The locking device includes a steering shaft axially connected to the upper locking plate. The end of the steering shaft near the lower locking plate is connected to a locking block. The locking block is a strip-shaped structure perpendicular to the steering shaft. The lower locking plate is provided with a locking block hole that matches the shape of the locking block. The length of the steering shaft corresponds to the sum of the thicknesses of the upper and lower locking plates.

[0007] With the above structure, when the fixing clamp is closed, the hinged semi-circular clamp rotates and assembles. As the fixing clamp is fully closed, the upper locking plate and the lower locking plate are in contact. The locking block passes through the matching locking block hole and moves to the side of the lower locking plate away from the upper locking plate. Using the steering shaft that is axially connected to the upper locking plate, the locking block connected to the steering shaft is pushed to rotate. The strip-shaped locking block rotates so that its two ends are misaligned with the locking block hole. Since the length of the steering shaft corresponds to the sum of the thickness of the upper and lower locking plates, the steering shaft pulls the locking block at this time, and the locking block abuts against the lower locking plate, so that the semi-circular clamp cannot be rotated to open. When it is necessary to open the fixing clamp, simply rotate the locking block to align it with the locking block hole again, making the operation more convenient.

[0008] As a further improvement of this utility model, the edge of the locking block is provided with a second guide surface formed by a chamfering treatment.

[0009] With the above structure, the second guide surface formed by the chamfering treatment on the edge of the locking block can be used to squeeze and guide the locking block when it rotates through the locking block hole, pushing the upper locking plate and the lower locking plate to fit together completely, so that the locking block and the edge of the locking block hole will not get stuck to each other.

[0010] As a further improvement of this utility model, the edges of the circular plate and the fixed plate are provided with positioning grooves corresponding to each other, and the inner side of the face plate is provided with positioning blocks that match the positioning grooves.

[0011] With the above structure, when installing the gun body, the positioning block on the inner side of the face plate can be inserted into the positioning groove on the circular plate and the fixed plate at the same time, so that the three are connected. When the locking device is used to tighten and close the fixing clamp, the semi-circular clamp or the fixed plate will not slide to the side of the circular plate and cause misalignment.

[0012] As a further improvement of this utility model, the gun head includes a silicon carbide substrate layer in the middle and silicon carbide whisker layers on the inner and outer sides.

[0013] With the above structure, the gun head is formed by the silicon carbide substrate layer and the silicon carbide whisker layers on the inner and outer sides, which gives the gun head the ability to resist wear, high temperature and chemical corrosion. When the gun head is impacted by airflow, the silicon carbide whisker layer outside the silicon carbide substrate layer absorbs energy by bridging cracks and pull-out effect, which makes the gun head more tough, improves the service life of the gun head, reduces the number of times the gun head is replaced, and makes daily maintenance more convenient. Attached Figure Description

[0014] Figure 1 The diagram shown is a schematic diagram of the structure of this utility model.

[0015] Figure 2 The diagram shown is a schematic of the structure of the fixing clamp.

[0016] Figure 3 The diagram shows the structure of the locking device in part A.

[0017] 1-Gun body, 2-Gun head, 3-Compressed air inlet, 4-Reducing agent inlet, 5-Sleeve, 6-Flange plate, 7-Circular plate, 8-Fixing clamp, 9-Face clamp plate, 10-Side clamp plate, 11-Locking hook, 12-First guide surface, 13-Upper locking plate, 14-Lower locking plate, 15-Steering shaft, 16-Locking block, 17-Block hole, 18-Second guide surface, 19-Positioning groove, 20-Positioning block. Detailed Implementation

[0018] like Figures 1-3The present invention discloses a boiler SNCR spray gun that is easy to replace, including a gun body 1, a gun head 2 connected to the front end of the gun body 1, a compressed air inlet 3 and a reducing agent inlet 4 at the rear end, and a connector and a fixing clamp 8. The connector includes a sleeve 5, and a flange plate 6 and a circular plate 7 connected to both ends of the sleeve 5. The flange plate 6 is connected to the boiler wall flange. The gun body 1 is provided with a fixing plate that matches the circular plate 7. The shape of the fixing clamp 8 matches the circular plate 7 and the fixing plate. The fixing clamp 8 includes a pair of semi-circular clamps that are hinged together, and a locking device for fixing the opening and closing of the clamp 8. The semi-circular clamp includes an arc-shaped face plate 9, a side plate 10 connected to both sides of the face plate 9 and a locking hook 11. The locking hook 11 has an arc-shaped first guide surface 12 facing the inner side of the side plate 10.

[0019] By connecting the flange plate 6 to the boiler wall flange, the nozzle 2 at the front end of the nozzle body 1 passes through the sleeve 5 and enters the boiler. The fixing plate on the nozzle body 1 overlaps with the circular plate 7. Then, the fixing clamp 8 is opened and closed, so that the semi-circular clamp simultaneously clamps the circular plate 7 and the fixing plate. The arc-shaped face clamp 9 fits against the circumferential surface of the circular plate 7 and the fixing plate. The side clamp 10 is aligned with the exposed side of the fixing plate. At this time, an arc-shaped first guide surface 12 is provided on the inner side of the side clamp 10 through the locking hook 11. The part of the first guide surface 12 that is farther away from the side clamp 10 first abuts against the edge of the circular plate 7. There is a gap between the side clamp 10 and the fixing plate. The size of the gap corresponds to the curvature of the first guide surface 12. As the locking device gradually tightens the fixing clamp 8, the locking hook... As the nozzle 11 moves closer to the sleeve 5, the first guide surface 12 presses against the circular plate 7, causing the side clamp 10 to fit and press against the fixing plate. This, in turn, presses the fixing plate and the circular plate 7 tightly together, forming a sealed connection between the nozzle body 1 and the connector. If the nozzle head 2 of the spray gun is damaged, simply open the locking device to loosen the fixing clamp 8, pull the nozzle body 1 out of the sleeve 5, and the nozzle head 2 at the front end can be removed, making the operation more convenient. This achieves the goal of connecting the circular plate 7 and the fixing plate by tightening the fixing clamp 8. At the same time, the first guide surface 12 of the locking hook 11 presses against the circular plate 7, cooperating with the side clamp 10 on the other side to press the fixing plate against the circular plate 7. No additional force is required to press the two together, meeting the need for quick disassembly and assembly of the spray gun.

[0020] One end of the semi-circular clamp is axially connected to each other, and the other end is respectively provided with an upper locking plate 13 and a lower locking plate 14. When the clamp 8 is not closed, the upper locking plate 13 and the lower locking plate 14 are in contact. The locking device includes a steering shaft 15 axially connected to the upper locking plate 13. The end of the steering shaft 15 near the lower locking plate 14 is connected to a locking block 16. The locking block 16 is a strip structure perpendicular to the steering shaft 15. The lower locking plate 14 is provided with a locking hole 17 that matches the shape of the locking block 16. The length of the steering shaft 15 corresponds to the sum of the thicknesses of the upper locking plate 13 and the lower locking plate 14.

[0021] When the fixing clamp 8 is closed, the hinged semi-circular clamp rotates and assembles. As the fixing clamp 8 is fully closed, the upper locking plate 13 and the lower locking plate 14 are in contact. The locking block 16 passes through the matching locking block hole 17 and moves to the side of the lower locking plate 14 away from the upper locking plate 13. Using the steering shaft 15 which is axially connected to the upper locking plate 13, the locking block 16 connected to the steering shaft 15 is pushed to rotate. The strip-shaped locking block 16 rotates so that its two ends are misaligned with the locking block hole 17. Since the length of the steering shaft 15 corresponds to the sum of the thickness of the upper locking plate 13 and the lower locking plate 14, the steering shaft 15 pulls the locking block 16 at this time, and the locking block 16 abuts against the lower locking plate 14, so that the semi-circular clamp cannot be rotated to open. When it is necessary to open the fixing clamp 8, simply rotate the locking block 16 to align it with the locking block hole 17 again, making the operation more convenient.

[0022] The edge of the locking block 16 is provided with a second guide surface 18 formed by chamfering.

[0023] The locking block 16 has a chamfered edge forming a second guide surface 18. When the locking block 16 rotates through the locking hole 17, the second guide surface 18 can be used to press and guide the upper locking plate 13 and the lower locking plate 14 to fully fit together, so that the locking block 16 and the edge of the locking hole 17 will not get stuck together.

[0024] The circular plate 7 and the fixed plate have corresponding positioning grooves 19 on their edges, and the inner side of the face plate 9 has positioning blocks 20 that match the positioning grooves 19.

[0025] When the gun body 1 is installed, the positioning block 20 on the inner side of the face plate 9 can be inserted into the positioning groove 19 on the circular plate 7 and the fixed plate at the same time, so that the three are connected. When the locking device is used to tighten and close the fixing clamp 8, the semi-circular clamp or the fixing plate will not slide to the side of the circular plate 7 and cause misalignment.

[0026] The gun head 2 includes a silicon carbide substrate layer in the middle and silicon carbide whisker layers on the inner and outer sides.

[0027] The gun head 2 is formed by a silicon carbide substrate layer and silicon carbide whisker layers on both the inner and outer sides. This gives the gun head 2 the ability to resist wear, high temperature and chemical corrosion. When the gun head 2 is impacted by airflow, the silicon carbide whisker layer outside the silicon carbide substrate layer absorbs energy by bridging cracks and pull-out effect, which makes the gun head 2 more tough, improves the service life of the gun head 2, reduces the number of times the gun head 2 needs to be replaced, and makes daily maintenance more convenient.

Claims

1. A replaceable boiler SNCR nozzle, comprising a nozzle body (1), a nozzle head (2) connected to the front end of the nozzle body (1), and a compressed air inlet (3) and a reducing agent inlet (4) provided at the rear end, characterized in that: It also includes connectors and fixing clamps (8). The connectors include a sleeve (5) and a flange plate (6) and a circular plate (7) connected to both ends of the sleeve (5). The flange plate (6) is connected to the boiler wall flange. The gun body (1) is provided with a fixing plate that matches the circular plate (7). The shape of the fixing clamp (8) matches the circular plate (7) and the fixing plate. The fixing clamp (8) includes a pair of semi-circular clamps that are hinged together and a locking device for fixing the opening and closing of the clamp (8). The semi-circular clamp includes an arc-shaped face plate (9), a side plate (10) connected to both sides of the face plate (9), and a locking hook (11). The locking hook (11) has an arc-shaped first guide surface (12) facing the inside of the side plate (10).

2. The easily replaceable boiler SNCR spray gun according to claim 1, characterized in that: One end of the semi-circular clamp is axially connected to each other, and the other end is provided with an upper locking plate (13) and a lower locking plate (14). When the clamp (8) is not closed, the upper locking plate (13) and the lower locking plate (14) are in contact. The locking device includes a steering shaft (15) axially connected to the upper locking plate (13). The end of the steering shaft (15) near the lower locking plate (14) is connected to a locking block (16). The locking block (16) is a strip structure perpendicular to the steering shaft (15). The lower locking plate (14) is provided with a locking hole (17) that matches the shape of the locking block (16). The length of the steering shaft (15) corresponds to the sum of the thicknesses of the upper locking plate (13) and the lower locking plate (14).

3. The boiler SNCR spray gun that is easy to replace according to claim 2, characterized in that: The edge of the latch block (16) is provided with a second guide surface (18) formed by chamfering.

4. The easily replaceable boiler SNCR spray gun according to claim 1, characterized in that: The circular plate (7) and the fixed plate have corresponding positioning grooves (19) on their edges, and the inner side of the face plate (9) has a positioning block (20) that matches the positioning groove (19).

5. The boiler SNCR spray gun that is easy to replace according to claim 1, characterized in that: The gun head (2) includes a silicon carbide substrate layer in the middle and silicon carbide whisker layers on the inner and outer sides.

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