Precise ammonia spraying device for boiler flue gas denitration

Abstract

The utility model discloses an accurate ammonia spraying device for boiler flue gas denitration, particularly relates to the technical field of flue gas treatment, and comprises a flue gas treatment outer frame, an ammonia spraying mechanism is arranged in the flue gas treatment outer frame, the ammonia spraying mechanism comprises a flow guide header pipe, and a plurality of uniformly distributed flow guide branch pipes are integrally formed on the outer side of the flow guide header pipe. The diversion branch pipes are fixedly clamped to the flue gas treatment outer frame, the ends, away from the diversion main pipe, of the diversion branch pipes extend into the flue gas treatment outer frame, connecting pipes are fixedly installed at the ends, away from the diversion main pipe, of the diversion branch pipes, and ammonia spraying pieces are fixedly installed at the ends, away from the diversion branch pipes, of the connecting pipes; according to the ammonia spraying device disclosed by the utility model, the ammonia spraying pieces are arranged, the plugging plates are used for plugging the spraying pipes to different degrees, and the amount of ammonia water sprayed by the spraying pipes is adjusted, so that different amounts of ammonia water are accurately sprayed in different spaces according to different ammonia spraying requirements, and waste and ammonia escape caused by excessive ammonia water discharge are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas treatment technical field, concretely for a kind of for boiler flue gas denitration precision ammonia injection device. BACKGROUND

[0002] Boiler flue gas denitration is through chemical or physical method to remove nitrogen oxides in boiler exhaust flue gas to reduce environmental pollution, and nitrogen oxides are important components causing acid rain and haze, so its control is very important, commonly used methods include selective catalytic reduction method, selective non-catalytic reduction method, wet denitration method, activated carbon adsorption method and flue gas denitration cleaning method;

[0003] When using selective non-catalytic reduction method to carry out boiler flue gas denitration, ammonia water or ammonia gas needs to be sprayed into high-temperature flue gas, ammonia is used as reducing agent to react with nitrogen oxides in flue gas, so that nitrogen oxides are reduced into harmless nitrogen and water, but the existing boiler flue gas denitration precision ammonia injection device still has some problems when in use: most of them are welded by pipeline, a plurality of spray holes are uniformly distributed on the pipeline, ammonia water or ammonia gas flows through the pipeline and is sprayed on the flue gas in the boiler and after preheating to react, but the inner diameter of the spray hole is the same, which cannot be flexibly adjusted, so that the amount of ammonia water or ammonia gas sprayed cannot be flexibly adjusted according to the flue gas flow, which is easy to cause waste and ammonia escape due to excessive ammonia water or ammonia gas emission, therefore, we propose a kind of for boiler flue gas denitration precision ammonia injection device to solve the above problems. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a kind of for boiler flue gas denitration precision ammonia injection device to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of for boiler flue gas denitration precision ammonia injection device, including flue gas treatment outer frame, the flue gas treatment outer frame is equipped with ammonia injection mechanism, the ammonia injection mechanism includes flow guide main pipe, the outer side of flow guide main pipe is integrally formed with the plurality of flow guide branch pipes of uniform distribution, the flow guide branch pipe is fixedly connected on flue gas treatment outer frame, the end of flow guide branch pipe away from flow guide main pipe extends to flue gas treatment outer frame, the end of flow guide branch pipe away from flow guide main pipe is fixedly installed with connecting pipe, the end of connecting pipe away from flow guide branch pipe is all fixedly installed with ammonia injection piece;

[0006] The ammonia spraying part comprises two ammonia spraying cylinders which are symmetrically distributed, an ammonia spraying pipe is arranged between the two ammonia spraying cylinders, a connecting piece is arranged between the end of the ammonia spraying pipe and the corresponding ammonia spraying cylinder, the top of the ammonia spraying cylinder and the ammonia spraying pipe is integrally formed with a spraying pipe, the top end of the spraying pipe is provided with a liquid distribution plate, a first shaft is rotatably installed at the middle part of the ammonia spraying cylinder, a second shaft is rotatably installed at the middle part of the ammonia spraying pipe, rotating clamping frames are fixedly installed at the two ends of the first shaft and the second shaft, the rotating clamping frames are rotatably clamped in the corresponding ammonia spraying cylinder and ammonia spraying pipe, a blocking plate is arranged at the top of the inner wall of the ammonia spraying cylinder and the ammonia spraying pipe, the blocking plate is fixedly installed at the top of the corresponding rotating clamping frame, and the outer wall of the blocking plate is in contact with the inner wall of the ammonia spraying cylinder and the ammonia spraying pipe.

[0007] Preferably, two positioning strips are fixedly installed at the top of the inner wall of the ammonia spraying cylinder and the ammonia spraying pipe, and the blocking plate is located between the two positioning strips.

[0008] Preferably, a connecting clamping shaft is fixedly installed at the middle part of one end of the first shaft close to the second shaft, and the connecting clamping shaft is movably clamped at the end of the second shaft.

[0009] Preferably, one of the first shafts is movably provided with an auxiliary shaft at one end away from the second shaft, the auxiliary shaft movably penetrates the flue gas treatment outer frame, a worm gear is fixedly installed at one end of the auxiliary shaft away from the first shaft, a worm is meshingly connected to the outer side of the worm gear, the worm is rotatably installed on the outer wall of the flue gas treatment outer frame, a driving motor is fixedly installed on one side of the outer wall of the flue gas treatment outer frame close to the worm, and the driving end of the driving motor and the bottom end of the worm are fixedly installed.

[0010] Preferably, a communication pipe is fixedly installed at the bottom of one of the ammonia spraying cylinders, and the communication pipe is fixedly installed at the top end of the corresponding connecting pipe.

[0011] Preferably, the connecting piece comprises a fixed frame and a limiting ring, the fixed frame is fixedly installed at the end of the ammonia spraying pipe, the limiting ring is fixedly installed at one end of the ammonia spraying cylinder close to the ammonia spraying pipe, a fixed sleeve frame is movably arranged on the outer side of the ammonia spraying cylinder, the fixed frame is movably sleeved at one end of the ammonia spraying cylinder close to the ammonia spraying pipe, the fixed frame is movably clamped in the fixed sleeve frame, a sealing ring is arranged between the fixed frame and the limiting ring, a fixed bolt is threadedly installed at one end of the fixed sleeve frame close to the fixed frame, and the end of the fixed bolt is threadedly installed on the fixed frame.

[0012] Preferably, an installation rod is fixedly installed at the bottom end of the liquid distribution plate, and the installation rod is fixedly clamped at the top of the corresponding spraying pipe through a bolt.

[0013] Preferably, a connecting head is fixedly installed at the end of the flow guide main pipe.

[0014] Compared with the prior art, the ammonia spraying part has the advantages that:

[0015] 1. By setting up multiple ammonia spraying components and using sealing plates to block the spray pipes to varying degrees, the amount of ammonia water sprayed from the spray pipes can be adjusted. This allows for the precise spraying of different amounts of ammonia water in different spaces according to different ammonia spraying needs, preventing excessive ammonia water discharge and waste, as well as ammonia escape.

[0016] 2. By setting up connecting parts for sealed installation between the ammonia injection cylinder and the ammonia injection pipe, it is easy to disassemble the ammonia injection cylinder and the ammonia injection pipe for separate cleaning and maintenance. It also allows for the selection of ammonia injection pipes and cylinders of different lengths for installation and use according to different usage requirements, thereby improving the overall performance of the ammonia injection device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the ammonia injection mechanism in this utility model.

[0020] Figure 3 This is a schematic diagram of the ammonia injection component in this utility model.

[0021] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle.

[0022] Figure 5 This utility model Figure 3 Enlarged view of point B in the middle.

[0023] Figure 6 This is a schematic diagram showing the structural connection between the sealing plate and the positioning strip in this utility model.

[0024] In the diagram: 1. Flue gas treatment outer frame; 2. Ammonia injection mechanism; 3. Main guide pipe; 31. Branch guide pipe; 32. Connecting pipe; 33. Connector; 4. Ammonia injection component; 41. Ammonia injection cylinder; 411. Connecting pipe; 42. Ammonia injection pipe; 43. Connector; 44. Injection pipe; 441. Dispersing plate; 442. Mounting rod; 45. First shaft; 451. Connecting clamp shaft; 46. Second shaft; 47. Rotating clamp; 471. Sealing plate; 472. Positioning strip; 48. Auxiliary shaft; 481. Worm gear; 482. Worm; 483. Drive motor; 431. Fixing frame; 432. Limiting ring; 433. Fixing sleeve; 434. Sealing ring; 435. Fixing bolt. Detailed Implementation

[0025] 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.

[0026] Example: Figures 1-6 As shown, this utility model provides a precision ammonia injection device for boiler flue gas denitrification, including a flue gas treatment frame 1, an ammonia injection mechanism 2 in the flue gas treatment frame 1, an ammonia injection mechanism 2 including a main guide pipe 3, a plurality of evenly distributed guide branch pipes 31 integrally formed on the outer side of the main guide pipe 3, the guide branch pipes 31 being fixedly snapped onto the flue gas treatment frame 1, the end of the guide branch pipe 31 away from the main guide pipe 3 extending into the flue gas treatment frame 1, the end of the guide branch pipe 31 away from the main guide pipe 3 being fixedly installed with a connecting pipe 32, and the end of the connecting pipe 32 away from the guide branch pipe 31 being fixedly installed with an ammonia injection component 4; a connector 33 is fixedly installed at the end of the main guide pipe 3, and in use, the end of the connector 33 is connected to the output port of the ammonia liquid output system.

[0027] The ammonia injection component 4 includes two symmetrically distributed ammonia injection cylinders 41. A connecting pipe 411 is fixedly installed at the bottom of one of the ammonia injection cylinders 41, and the connecting pipe 411 is fixedly installed at the top of the corresponding connecting pipe 32. An ammonia injection pipe 42 is provided between the two ammonia injection cylinders 41. A connector 43 is provided between the end of the ammonia injection pipe 42 and the corresponding ammonia injection cylinder 41. The top of both the ammonia injection cylinder 41 and the ammonia injection pipe 42 are integrally formed with a spray pipe 44. A liquid dispersion plate 441 is provided at the top of the spray pipe 44. A first shaft 45 is rotatably installed in the middle of the ammonia injection cylinder 41, and a second shaft 46 is rotatably installed in the middle of the ammonia injection pipe 42. A connecting clamp shaft 451 is fixedly installed in the middle of the end of the first shaft 45 near the second shaft 46. The connecting clamp shaft 451 is movably clamped to the end of the second shaft 46 to perform clamping installation between the first shaft 45 and the second shaft 46.

[0028] Rotating brackets 47 are fixedly installed at both ends of the first shaft 45 and the second shaft 46. The rotating brackets 47 are rotatably engaged in the corresponding ammonia injection cylinder 41 and ammonia injection pipe 42. A sealing plate 471 is provided on the top of the inner wall of the ammonia injection cylinder 41 and ammonia injection pipe 42. The sealing plate 471 is fixedly installed on the top of the corresponding rotating bracket 47. Two positioning strips 472 are fixedly installed on the top of the inner wall of the ammonia injection cylinder 41 and ammonia injection pipe 42. The sealing plate 471 is located between the positioning strips 472. The outer wall of the sealing plate 471 is in contact with the inner wall of the ammonia injection cylinder 41 and ammonia injection pipe 42 respectively.

[0029] An auxiliary shaft 48 is movably mounted at one end of the first shaft 45 away from the second shaft 46. The auxiliary shaft 48 movably passes through the flue gas treatment outer frame 1. A worm gear 481 is fixedly installed at the end of the auxiliary shaft 48 away from the first shaft 45. A worm 482 is meshed with the outer side of the worm gear 481. The worm 482 is rotatably mounted on the outer wall of the flue gas treatment outer frame 1. A drive motor 483 is fixedly installed on the outer wall of the flue gas treatment outer frame 1 near the worm 482. The drive end of the drive motor 483 is fixedly installed with the bottom end of the worm 482. The control starts the drive motor 483 to drive the worm gear 482 to rotate the worm wheel 481, thereby driving the corresponding auxiliary shaft 48, the first shaft 45 and the second shaft 46 to rotate. This causes the rotating bracket 47 and the sealing plate 471 to rotate between the two positioning bars 472. The sealing plate 471 blocks the nozzle 44 to different degrees, adjusting the amount of ammonia water sprayed from the nozzle 44. This allows for precise spraying of different amounts of ammonia water in different spaces according to different ammonia spraying needs, preventing excessive ammonia water discharge and waste, as well as ammonia escape.

[0030] The connector 43 includes a fixed frame 431 and a limiting ring 432. The fixed frame 431 is fixedly installed at the end of the ammonia injection pipe 42, and the limiting ring 432 is fixedly installed at the end of the ammonia injection cylinder 41 near the ammonia injection pipe 42. A fixed sleeve 433 is movably sleeved on the outside of the ammonia injection cylinder 41. The fixed frame 431 is movably sleeved at the end of the ammonia injection cylinder 41 near the ammonia injection pipe 42 and is movably snapped into the fixed sleeve 433. A sealing ring 434 is provided between the fixed frame 431 and the limiting ring 432. A fixing bolt 435 is threadedly installed at the end of the fixed sleeve 433 near the fixed frame 431. The end of the fixing bolt 435 is threadedly installed on the fixed frame 431 to seal the ammonia injection cylinder 41 and the ammonia injection pipe 42. This facilitates the disassembly of the ammonia injection cylinder 41 and the ammonia injection pipe 42 for separate cleaning and maintenance. It also allows for the selection of different lengths of ammonia injection pipe 42 and ammonia injection cylinder 41 for installation and use according to different length requirements, thereby improving the overall performance of the ammonia injection device.

[0031] An installation rod 442 is fixedly installed at the bottom of the spray plate 441. The installation rod 442 is fixedly snapped to the top of the corresponding spray pipe 44 by bolts, which facilitates the removal of the installation rod 442 for disassembly and cleaning of the spray plate 441.

[0032] Working principle: When in use, connect the end of connector 33 to the output port of the ammonia output system, control the start of the ammonia output system, and the ammonia liquid is introduced into multiple ammonia injection components 4 through the ammonia output system, connector 33, main guide pipe 3, multiple guide branch pipes 31, connecting pipe 32 and connecting pipe 411, and sprayed out through multiple spray pipes 44, and evenly sprayed out through the liquid distribution plate 441 to mix with the flue gas;

[0033] Specifically, by controlling the start of the drive motor 483 to drive the worm gear 482 to rotate the worm wheel 481, the corresponding auxiliary shaft 48, the first shaft 45 and the second shaft 46 will rotate, thereby causing the rotating bracket 47 and the sealing plate 471 to rotate between the two positioning bars 472. The sealing plate 471 will block the nozzle 44 to different degrees, adjust the amount of ammonia water sprayed from the nozzle 44, and then accurately spray different amounts of ammonia water in different spaces according to different ammonia spraying needs, so as to prevent excessive ammonia water discharge and waste and ammonia escape.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision ammonia injection device for boiler flue gas denitrification, comprising a flue gas treatment frame (1), characterized in that: The flue gas treatment outer frame (1) is provided with an ammonia injection mechanism (2). The ammonia injection mechanism (2) includes a main guide pipe (3). A plurality of evenly distributed guide branch pipes (31) are integrally formed on the outer side of the main guide pipe (3). The guide branch pipes (31) are fixedly snapped onto the flue gas treatment outer frame (1). The end of the guide branch pipe (31) away from the main guide pipe (3) extends into the flue gas treatment outer frame (1). A connecting pipe (32) is fixedly installed at the end of the guide branch pipe (31) away from the main guide pipe (3). An ammonia injection component (4) is fixedly installed at the end of the connecting pipe (32) away from the guide branch pipe (31). The ammonia injection component (4) includes two symmetrically distributed ammonia injection cylinders (41), with an ammonia injection pipe (42) between the two ammonia injection cylinders (41). A connector (43) is provided between the end of the ammonia injection pipe (42) and the corresponding ammonia injection cylinder (41). The top of both the ammonia injection cylinder (41) and the ammonia injection pipe (42) is integrally formed with a spray pipe (44). The top of the spray pipe (44) is provided with a liquid distribution plate (441). A first shaft (45) is rotatably installed in the middle of the ammonia injection cylinder (41), and a first shaft (45) is rotatably installed in the middle of the ammonia injection pipe (42). There is a second shaft (46), and rotating brackets (47) are fixedly installed at both ends of the first shaft (45) and the second shaft (46). The rotating brackets (47) are rotatably engaged in the corresponding ammonia injection cylinder (41) and ammonia injection pipe (42). The top of the inner wall of the ammonia injection cylinder (41) and ammonia injection pipe (42) is provided with a sealing plate (471). The sealing plate (471) is fixedly installed on the top of the corresponding rotating bracket (47), and the outer wall of the sealing plate (471) is in contact with the inner wall of the ammonia injection cylinder (41) and ammonia injection pipe (42).

2. The precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: Two positioning strips (472) are fixedly installed on the top of the inner wall of the ammonia injection cylinder (41) and ammonia injection pipe (42), and the sealing plate (471) is located between the positioning strips (472).

3. The precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: A connecting clip (451) is fixedly installed at the middle of one end of the first shaft (45) near the second shaft (46), and the connecting clip (451) is movably clipped to the end of the second shaft (46).

4. The precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: An auxiliary shaft (48) is movably mounted on one end of the first shaft (45) away from the second shaft (46). The auxiliary shaft (48) movably passes through the flue gas treatment outer frame (1). A worm gear (481) is fixedly mounted on the end of the auxiliary shaft (48) away from the first shaft (45). A worm (482) is meshed with the outer side of the worm gear (481). The worm (482) is rotatably mounted on the outer wall of the flue gas treatment outer frame (1). A drive motor (483) is fixedly mounted on the side of the outer wall of the flue gas treatment outer frame (1) near the worm (482). The drive end of the drive motor (483) and the bottom end of the worm (482) are fixedly mounted.

5. A precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: One of the ammonia injection cylinders (41) has a connecting pipe (411) fixedly installed at the bottom, and the connecting pipe (411) is fixedly installed at the top of the corresponding connecting pipe (32).

6. A precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: The connector (43) includes a fixing frame (431) and a limiting ring (432). The fixing frame (431) is fixedly installed at the end of the ammonia injection pipe (42). The limiting ring (432) is fixedly installed at the end of the ammonia injection cylinder (41) near the ammonia injection pipe (42). The fixing frame (433) is movably sleeved on the outside of the ammonia injection cylinder (41). The fixing frame (431) is movably sleeved at the end of the ammonia injection cylinder (41) near the ammonia injection pipe (42). The fixing frame (431) is movably snapped into the fixing frame (433). A sealing ring (434) is provided between the fixing frame (431) and the limiting ring (432). A fixing bolt (435) is threadedly installed at the end of the fixing frame (433) near the fixing frame (431). The end of the fixing bolt (435) is threadedly installed on the fixing frame (431).

7. A precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: An installation rod (442) is fixedly installed at the bottom end of the liquid distribution plate (441), and the installation rod (442) is fixedly snapped to the top of the corresponding nozzle (44) by bolts.

8. A precision ammonia injection device for boiler flue gas denitrification according to claim 1, characterized in that: The end of the main guide pipe (3) is fixedly installed with a connector (33).

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