Ammonia injection mechanism of SNCR denitration system and SNCR denitration system

Abstract

The present application relates to SNCR denitration technical field, and disclose a kind of ammonia gas spouting mechanism of SNCR denitration system and SNCR denitration system, lance assembly includes spout and the docking disc assembly of rotation sleeve on spout;After spout is inserted into the inside of boiler via insertion tube, docking disc assembly is rotated relative to spout and locking disc, until docking disc assembly and locking disc are automatically locked and fixed;Reducing agent liquid promotes runner vane assembly, so that runner vane assembly is rotated by rotating shaft to drive rotary diffuser, reducing agent liquid realizes speed-up after passing through direction guard shield assembly and nozzle assembly in turn, rotary diffuser is used to periodically block the jet orifice, for expanding the range of reducing agent liquid atomization emission.The reducing agent liquid of the present application realizes speed-up after passing through direction guard shield assembly and nozzle assembly in turn, and the jet orifice is periodically blocked by rotary diffuser, the range of reducing agent liquid atomization emission is expanded, so that reducing agent can be more evenly contacted with flue gas in boiler.

Description

Technical Field

[0001] This invention relates to the field of SNCR denitrification technology, specifically to an ammonia injection mechanism and an SNCR denitrification system. Background Technology

[0002] In the SNCR denitrification process, ammonia water or urea is generally used as the ammonia source. Ammonia water will volatilize and produce ammonia gas, and urea will also produce ammonia gas when it decomposes at high temperatures. The ammonia gas is the one that actually participates in the denitrification reaction. It reacts chemically with nitrogen oxides in the flue gas to convert them into nitrogen gas and water, thereby achieving the purpose of denitrification.

[0003] In SNCR denitrification systems, ammonia or urea solutions need to be thoroughly mixed with flue gas to achieve efficient denitrification. However, in actual operation, due to factors such as pipeline layout and flue gas flow characteristics, it is difficult to ensure uniform mixing of ammonia and flue gas throughout the entire reaction area. In particular, the ammonia or urea solution cannot diffuse quickly and evenly after being atomized by the spray gun, which can lead to excessively high local ammonia concentrations. This results in increased ammonia escape, while areas that have not reacted sufficiently will have insufficient ammonia, affecting the denitrification effect. This, in turn, leads to an increase in the overall ammonia injection, creating a vicious cycle.

[0004] In practice, the spray gun will be disassembled and maintained to ensure its atomization effect on ammonia or urea solution. However, the common installation method of the spray gun is not conducive to the quick disassembly and installation of the spray gun. Therefore, we have introduced an ammonia gas injection mechanism and an SNCR denitrification system. Summary of the Invention

[0005] The purpose of this invention is to provide an ammonia injection mechanism and an SNCR denitrification system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ammonia gas injection mechanism for an SNCR denitrification system, comprising a spray gun assembly inserted into a boiler, wherein a locking disc is connected to the side of the boiler by a plug-in sleeve, and the spray gun assembly comprises a spray pipe and a docking disc assembly rotatably sleeved on the spray pipe.

[0007] After the nozzle is inserted into the boiler through the connector, the docking plate assembly rotates relative to the nozzle and the locking plate until the docking plate assembly and the locking plate are automatically locked and fixed.

[0008] The nozzle has a rotating shaft movably connected to the end of the nozzle by an annular bracket assembly. The front end of the rotating shaft is provided with a rotating wheel blade assembly. The nozzle assembly is screwed to the end of the nozzle. The rear end of the annular bracket assembly and the front end of the nozzle assembly are provided with a guide protective cover assembly that is sleeved on the outside of the rotating shaft. The rear end of the rotating shaft passes through the nozzle disk and is fixed with a rotating diffuser.

[0009] When the reducing agent liquid is injected into the boiler through the nozzle, the reducing agent liquid pushes the rotor blade assembly, which in turn drives the rotary diffuser to rotate via the rotating shaft. The reducing agent liquid is accelerated after passing through the guide shield assembly and the nozzle assembly in sequence, until the reducing agent liquid is atomized and sprayed out through the nozzle on the spray plate. At the same time, the rotary diffuser is used to periodically block the nozzle to expand the range of the reducing agent liquid atomization.

[0010] Preferably, the nozzle has a reducing agent inlet and a compressed air inlet at its front end.

[0011] Preferably, the docking disc assembly includes a fixed cylinder screwed to the outside of the nozzle, a first bearing centrally sleeved on the outside of the fixed cylinder, a docking rotating disc sleeved on the outside of the first bearing, and an annular sealing cap symmetrically screwed to both ends of the outside of the fixed cylinder.

[0012] The rear end of the docking rotating disk is provided with two sets of abutment posts and two sets of L-shaped buckles;

[0013] The front end of the locking disc is provided with two sets of inclined grooves and two sets of L-shaped slots;

[0014] When the rear end of the abutment column slides backward along the ramp groove, the L-shaped buckle engages with the corresponding L-shaped slot.

[0015] Preferably, the outer wall of the annular sealing cover is provided with an annular protrusion, and the inner wall of the docking rotating disk is provided with an annular groove, with the annular protrusion disposed in the corresponding annular groove.

[0016] Preferably, the rear side of the L-shaped slot is fixed with a locking block by a spring. When the L-shaped buckle is gradually inserted into the corresponding L-shaped slot, the locking block will retract under the resistance of the L-shaped buckle. At this time, the spring is in a compressed state. After the L-shaped buckle continues to be inserted into the corresponding L-shaped slot, the locking block extends under the elastic force of the spring until the locking block fixes the L-shaped buckle in the L-shaped slot.

[0017] Preferably, the annular support assembly includes an annular frame inside the nozzle end and an intermediate sleeve fixed to the inner side of the annular frame by a connecting plate.

[0018] The front end of the rotating shaft extends through the middle sleeve. Two sets of second bearings are sleeved on the front part of the rotating shaft. The two sets of second bearings are set inside the middle sleeve. A sealing cylinder is also provided at the rear of the middle sleeve. The sealing cylinder is sleeved on the rotating shaft.

[0019] Preferably, the impeller blade assembly includes a connector and inclined blades that are equally spaced and connected to the side of the connector;

[0020] The connector is fitted onto the outer front end of the intermediate sleeve, and a third bearing is fitted onto the front end of the intermediate sleeve. The third bearing is located inside the rear end of the connector.

[0021] The front end of the rotating shaft is fixedly connected to the middle of the rear end of the connector.

[0022] Preferably, the guide shield assembly includes a conical shield fixed to the rear end of the intermediate sleeve and a cylindrical shield fixed to the rear end of the conical shield, wherein the outer diameter of the conical shield gradually increases from front to back;

[0023] The nozzle assembly includes an externally threaded cylinder screwed into the end of the nozzle pipe, a first conical cylinder connected to the rear end of the externally threaded cylinder, and a second conical cylinder connected to the rear end of the first conical cylinder. The inner diameter of the first conical cylinder gradually decreases from front to back, and the inner diameter of the second conical cylinder gradually increases from front to back.

[0024] The spray disc is fixed at the connection between the inner sides of the first and second conical cylinders. A connecting cylinder is provided at the middle of the front end of the spray disc. The rear end of the cylindrical cover is sleeved on the outer side of the connecting cylinder. Two sets of fourth bearings are provided on the inner side of the connecting cylinder. The two sets of fourth bearings are sleeved on the outer side of the rotating shaft.

[0025] Preferably, several sets of nozzles are circular and evenly spaced on the outer side of the spray disk, and the nozzles are located at the rear between the cylindrical cover and the first conical cylinder;

[0026] The rotating diffuser includes an end cap fitted onto the rear end of the rotating shaft, and several sets of conical seats fixed to the outer wall of the end cap by an annular mesh frame. The several sets of conical seats are circular and equally spaced, and the outer diameter of the conical seats gradually increases from front to back.

[0027] The rear end of the ejector disc is also connected to an annular stop, the end cap is located inside the annular stop, and several sets of conical seats are located outside the annular stop.

[0028] In addition, to achieve the above objectives, the present invention also provides an SNCR denitrification system, including an ammonia gas injection mechanism for the SNCR denitrification system.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the reducing agent liquid of the present invention is accelerated after passing through the guide shield assembly and the nozzle assembly in sequence, and is atomized and sprayed out through the nozzle holes on the spray plate. The rotating diffuser periodically blocks the nozzle holes, expands the range of the reducing agent liquid atomization and spray, and enables the reducing agent to contact the flue gas in the boiler more evenly, thereby improving the comprehensiveness and efficiency of the denitrification reaction.

[0030] Automatic locking design: The docking plate assembly and locking plate adopt a unique automatic locking structure. During installation, the nozzle is inserted into the boiler through the plug-in sleeve, and the abutment column slides backward along the inclined groove, causing the docking rotating plate to rotate. The L-shaped buckle engages with the corresponding L-shaped slot, achieving automatic locking. No additional complicated operations are required, improving installation efficiency. The locking structure is stable and reliable, ensuring that the spray gun assembly will not loosen during operation.

[0031] During disassembly, simply press the locking block to compress the spring, causing the locking block to retract. Manually rotate the docking turntable clockwise, and the abutment column will slide forward along the ramp groove. The L-shaped clip will disengage from the L-shaped slot, allowing the spray gun assembly to be pulled out. Furthermore, because the nozzle is inserted or pulled out in a straight line, the reducing agent hose and compressed air hose connected to the nozzle avoid interference with the disassembly or installation of the spray gun assembly. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of the entire assembled invention;

[0033] Figure 2 This is a three-dimensional structural diagram of the connection between the boiler, the plug-in cylinder, and the locking disc of the present invention.

[0034] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0035] Figure 4 This is a schematic diagram of the connection between the card block and the spring in this invention;

[0036] Figure 5 This is a three-dimensional structural diagram of the assembly of the docking plate assembly, nozzle assembly, and nozzle pipe according to the present invention;

[0037] Figure 6 This is an exploded structural diagram of the docking plate assembly of the present invention;

[0038] Figure 7 For the present invention Figure 6 A structural diagram from another perspective;

[0039] Figure 8 This is a cross-sectional view of the docking plate assembly of the present invention;

[0040] Figure 9 For the present invention Figure 5 A structural diagram from another perspective;

[0041] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point B;

[0042] Figure 11 This is a schematic diagram of the assembly of the nozzle assembly, the annular support assembly, and the impeller blade assembly of the present invention.

[0043] Figure 12 For the present invention Figure 11 A schematic diagram of the decomposed structure;

[0044] Figure 13 This is a cross-sectional view of the assembly of the annular support assembly and the impeller blade assembly of the present invention.

[0045] Figure 14 For the present invention Figure 11 A structural diagram from another perspective;

[0046] Figure 15 For the present invention Figure 14 A schematic diagram of the cross-sectional structure;

[0047] Figure 16 This is a cross-sectional structural diagram showing the connection between the nozzle assembly, the annular support assembly, the impeller blade assembly, and the nozzle pipe of the present invention.

[0048] Figure 17 This is a cross-sectional view of the overall structure of the present invention;

[0049] Figure 18 This is a cross-sectional structural diagram of the assembly of the spray gun assembly, docking plate assembly, and nozzle assembly of the present invention;

[0050] Figure 19 This is a schematic diagram of the structure of the L-shaped buckle of the present invention just as it enters the L-shaped slot;

[0051] Figure 20 For the present invention Figure 19 Enlarged structural diagram at point C;

[0052] Figure 21 This is a schematic diagram of the structure of the L-shaped buckle of the present invention when it enters the L-shaped slot and abuts against the buckle block;

[0053] Figure 22 This is a schematic diagram of the connection between the mating disc assembly and the locking disc of the present invention.

[0054] In the diagram: 1. Boiler; 2. Connecting sleeve; 3. Locking disc; 301. Inclined groove; 302. L-shaped slot; 303. Locking block; 304. Spring; 4. Nozzle; 401. Reducing agent inlet; 402. Compressed air inlet; 5. Connecting disc assembly; 501. Fixing cylinder; 502. Annular sealing cover; 5021. Annular protrusion; 503. Connecting rotating disc; 5031. Annular groove; 504. L-shaped buckle; 505. Abutment post; 506. First bearing; 6. Nozzle assembly; 601. 602. First conical cylinder; 603. Second conical cylinder; 604. Spraying disc; 605. Annular stop; 606. Spray hole; 607. External threaded cylinder; 608. Fourth bearing; 609. Connecting cylinder; 700. End cap; 701. Annular grid frame; 702. Conical seat; 801. Annular frame; 802. Connecting plate; 803. Intermediate sleeve; 804. Second bearing; 805. Sealing cylinder; 906. Inclined blade; 907. Connecting head; 908. Third bearing; 10. Cylindrical cover; 11. Conical cover; 12. Rotating shaft. Detailed Implementation

[0055] 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.

[0056] Example:

[0057] Please see Figure 1-22 The present invention provides a technical solution:

[0058] An ammonia injection mechanism for an SNCR denitrification system includes a spray gun assembly inserted into a boiler 1. A locking disc 3 is connected to the side of the boiler 1 by a plug-in tube 2. The spray gun assembly includes a spray pipe 4 and a docking disc assembly 5 rotatably sleeved on the spray pipe 4.

[0059] The nozzle 4 has a reducing agent inlet 401 and a compressed air inlet 402 at its front end. The reducing agent inlet 401 is used to introduce urea solution or ammonia water, and the compressed air inlet 402 is used to introduce compressed air. When the compressed air flows backward in the nozzle 4, it atomizes the urea solution or ammonia water and sprays it into the boiler 1. The compressed air is used to atomize the liquid reducing agent (forming fine droplets to improve reaction efficiency), but it is not premixed with the reducing agent. Instead, it works in conjunction with the nozzle assembly 6 of the spray gun assembly.

[0060] After the nozzle 4 is inserted into the boiler 1 via the insertion sleeve 2, the docking plate assembly 5 rotates relative to the nozzle 4 and the locking plate 3 until the docking plate assembly 5 and the locking plate 3 are automatically locked and fixed.

[0061] like Figure 5-9 As shown, the docking plate assembly 5 includes a fixed cylinder 501 screwed to the outside of the nozzle 4, a first bearing 506 centrally sleeved on the outside of the fixed cylinder 501, a docking rotating disk 503 sleeved on the outside of the first bearing 506, and an annular sealing cap 502 symmetrically screwed to both ends of the outside of the fixed cylinder 501.

[0062] The outer wall of the annular sealing cover 502 is provided with an annular protrusion 5021, and the inner wall of the docking rotating disk 503 is provided with an annular groove 5031, with the annular protrusion 5021 set in the corresponding annular groove 5031.

[0063] The annular protrusion 5021 on the outer wall of the annular sealing cover 502 cooperates with the annular groove 5031 on the inner wall of the docking rotating disk 503 to achieve a sealing effect, prevent external impurities from entering, and also ensure the smooth rotation of the docking rotating disk 503.

[0064] In this way, the annular sealing cover 502 can protect the first bearing 506 and prevent dust or water from entering the first bearing 506 and causing the first bearing 506 to rust.

[0065] This arrangement, after the fixed cylinder 501 is fixed to the nozzle 4, allows the docking rotating disk 503 to rotate through the first bearing 506, so that the docking rotating disk 503 can automatically lock and fix itself to the locking disk 3 after rotating relative to the nozzle 4 and the locking disk 3.

[0066] The rear end of the docking rotating disk 503 is provided with two sets of abutment posts 505 and two sets of L-shaped buckles 504 (e.g. Figure 6-7 (as shown)

[0067] The front end of the locking disc 3 is provided with two sets of inclined grooves 301 and two sets of L-shaped slots 302 (e.g. Figure 3 (as shown)

[0068] When the rear end of the abutment column 505 slides backward along the ramp groove 301, the L-shaped buckle 504 is engaged in the corresponding L-shaped groove 302.

[0069] The docking plate assembly 5 adopts a combination structure of a fixed cylinder 501, a first bearing 506, a docking rotating disk 503, and an annular sealing cover 502.

[0070] The fixing cylinder 501 is screwed to the outside of the nozzle 4, ensuring the connection stability between the docking plate assembly 5 and the nozzle 4;

[0071] The first bearing 506 enables the docking rotating disk 503 to rotate flexibly relative to the fixed cylinder 501, facilitating automatic locking with the locking disk 3.

[0072] The rear side of the L-shaped slot 302 is fixed with a locking block 303 by a spring 304. When the L-shaped buckle 504 is gradually inserted into the corresponding L-shaped slot 302, the locking block 303 will retract under the resistance of the L-shaped buckle 504. At this time, the spring 304 is in a compressed state. After the L-shaped buckle 504 continues to be inserted into the corresponding L-shaped slot 302, the locking block 303 extends under the elastic force of the spring 304 until the locking block 303 fixes the L-shaped buckle 504 in the L-shaped slot 302.

[0073] The nozzle 4 is inserted into the boiler 1 via the connector 2. Simultaneously, the rear end of the abutment column 505 slides backward along the inclined groove 301, causing the L-shaped latch 504 to engage with the corresponding L-shaped slot 302 (e.g., Figure 19 and 20 (as shown)

[0074] At this time, as the rear end of the abutment post 505 slides backward along the ramp groove 301, the docking rotating disk 503 rotates counterclockwise relative to the nozzle 4 and the locking disk 3. The L-shaped buckle 504 on the docking rotating disk 503 will gradually abut against the locking block 303. The locking block 303 will retract under the abutment of the L-shaped buckle 504. At this time, the spring 304 is in a compressed state (e.g., Figure 21 (as shown)

[0075] As the nozzle 4 continues to be inserted into the boiler 1, the L-shaped buckle 504 continues to be inserted into the corresponding L-shaped slot 302. Then, the locking block 303 extends under the elastic force of the spring 304 until the locking block 303 fixes the L-shaped buckle 504 in the L-shaped slot 302 (e.g., ...). Figure 22 As shown in the figure, at this time, the front surfaces of the docking rotating disk 503 and the locking disk 3 are in contact.

[0076] Since the rear end of the abutment post 505 always abuts against the surface of the ramp groove 301, the ramp groove 301 will cause the docking rotating disk 503 to have a counterclockwise rotation tendency through the abutment post 505. When the front end surfaces of the docking rotating disk 503 and the locking disk 3 are in contact, this counterclockwise rotation tendency will cause the L-shaped buckle 504 on the docking rotating disk 503 to be tightly locked in the L-shaped slot 302, thus preventing the docking rotating disk 503 from separating from the locking disk 3.

[0077] The automatic locking structure design of the docking plate assembly 5 and the locking plate 3 makes the installation process of the spray gun assembly simple and convenient. Simply insert the nozzle 4 into the insertion tube 2 and rotate the docking rotating plate 503 of the docking plate assembly 5 to achieve automatic locking. No additional complicated operations are required, which improves installation efficiency. Moreover, the locking structure is stable and reliable, ensuring that the spray gun assembly will not loosen during operation.

[0078] When it is necessary to disassemble the spray gun assembly, simply press the locking block 303 to compress the spring 304 and retract the locking block 303. Then, manually rotate the docking rotating plate 503 clockwise. The rear end of the abutment column 505 slides forward along the surface of the ramp groove 301, causing the L-shaped buckle 504 to disengage from the L-shaped slot 302 until the docking rotating plate 503 disengages from the locking plate 3. Finally, pull out the spray gun assembly.

[0079] Since the nozzle 4 is connected to the reducing agent hose and the compressed air hose, which may cause interference during the disassembly or installation of the spray gun assembly, an automatic locking structure design with the docking plate assembly 5 and the locking plate 3 is adopted. When the nozzle 4 is inserted into the plug tube 2 and extended into the boiler 1, or when the nozzle 4 is pulled out of the plug tube 2, the nozzle 4 will not rotate. The nozzle 4 only needs to be inserted or pulled out straight. This can prevent the reducing agent hose and the compressed air hose on the nozzle 4 from affecting the disassembly or installation of the spray gun assembly.

[0080] The nozzle 4 has a ring-shaped bracket assembly inside which a rotating shaft 12 is movably connected, and the front end of the rotating shaft 12 is provided with a rotating wheel blade assembly.

[0081] like Figure 11 , 13 As shown in Figure 15, the annular support assembly includes an annular frame 8 inside the end of the nozzle 4 and an intermediate sleeve 802 fixed to the inner side of the annular frame 8 by a connecting plate 801.

[0082] The front end of the rotating shaft 12 extends through the intermediate sleeve 802. Two sets of second bearings 803 are sleeved on the front part of the rotating shaft 12. The two sets of second bearings 803 are arranged inside the intermediate sleeve 802. A sealing cylinder 804 is also provided in the rear part of the interior of the intermediate sleeve 802. The sealing cylinder 804 is sleeved on the rotating shaft 12.

[0083] The annular bracket assembly's annular frame 8 and intermediate sleeve 802 are fixed by a connecting plate 801, providing a stable support structure from the front of the rotating shaft 12. The second bearing 803 and sealing sleeve 804 installed inside the intermediate sleeve 802 ensure the smooth rotation and sealing of the rotating shaft 12.

[0084] The impeller blade assembly includes a connector 901 and inclined blades 9 that are equally spaced on the side of the connector 901;

[0085] The connector 901 is fitted onto the outer front end of the intermediate sleeve 802, and the front end of the intermediate sleeve 802 is fitted with a third bearing 902, which is located inside the rear end of the connector 901. The third bearing 902 allows the connector 901 to rotate smoothly relative to the intermediate sleeve 802.

[0086] The front end of the rotating shaft 12 is fixedly connected to the middle of the rear end of the connector 901.

[0087] The above configuration allows connector 901 to seal the front end of intermediate sleeve 802, thus preventing the reducing agent liquid from entering the intermediate sleeve 802 when it flows backward along nozzle 4 through the annular support assembly.

[0088] The reducing agent liquid first comes into contact with the connector 901, and under the guidance of the connector 901, the reducing agent liquid diffuses to the outside of the connector 901, and then the reducing agent liquid continues to flow backward through the space between adjacent connecting plates 801.

[0089] The inclined blades 9 of the rotor blade assembly are connected at equal intervals to the side of the connector 901, which can effectively convert the impact force of the reducing agent liquid into rotational power.

[0090] The nozzle assembly 6 is screwed to the end of the nozzle 4. The middle rear end of the annular bracket assembly and the front middle of the nozzle assembly 603 are provided with a guide protective cover assembly sleeved on the outside of the rotating shaft 12. The rear end of the rotating shaft 12 passes through the nozzle assembly 603 and is fixed with a rotating diffuser.

[0091] The guide shield assembly includes a conical shield 11 fixed to the rear end of the intermediate sleeve 802 and a cylindrical shield 10 fixed to the rear end of the conical shield 11. The outer diameter of the conical shield 11 gradually increases from front to back. When the reducing agent liquid passes through the conical shield 11, the flow rate of the reducing agent liquid increases because the space between the outer wall of the conical shield 11 and the inner wall of the nozzle 4 is reduced.

[0092] The nozzle assembly 6 includes an externally threaded cylinder 606 screwed into the end of the nozzle pipe 4, a first conical cylinder 601 connected to the rear end of the externally threaded cylinder 606, and a second conical cylinder 602 connected to the rear end of the first conical cylinder 601. The overall outer diameter of the nozzle assembly 6 is not greater than the outer diameter of the nozzle pipe 4. This ensures that after the nozzle assembly 6 and the nozzle pipe 4 are assembled, the rear end of the nozzle pipe 4 can extend into the boiler 1 through the plug-in cylinder 2.

[0093] The inner diameter of the first conical cylinder 601 gradually decreases from front to back. As the reducing agent liquid flows from the outside of the cylindrical cover 10 to the inside of the first conical cylinder 601, the space between the inner wall of the first conical cylinder 601 and the outer wall of the cylindrical cover 10 is reduced, which again increases the flow rate of the reducing agent liquid.

[0094] By increasing the flow rate of the reducing agent liquid twice, the loss of flow rate caused by the reducing agent liquid coming into contact with the inclined blade 9 can be compensated.

[0095] The inner diameter of the second conical cylinder 602 gradually increases from front to back. This increases the atomization range of the reducing agent liquid when it is atomized and sprayed out through the nozzle 605, making the atomization of the reducing agent liquid more uniform.

[0096] The structural design of the conical cover 11 and cylindrical cover 10 of the guide shield assembly is beneficial for accelerating and guiding the reducing agent liquid. The change in the inner diameter of the first conical cylinder 601 and the second conical cylinder 602 of the nozzle assembly 6 further optimizes the spraying effect of the reducing agent liquid. The reducing agent liquid forms fine droplets, increasing the contact area between the reducing agent and the flue gas inside the boiler 1, which can significantly improve the reaction efficiency and thus improve the working efficiency of the entire denitrification system.

[0097] The spray plate 603 is fixed at the connection between the inner side of the first conical cylinder 601 and the second conical cylinder 602. A connecting cylinder 608 is provided at the middle of the front end of the spray plate 603. The rear end of the cylindrical cover 10 is sleeved on the outside of the connecting cylinder 608. This arrangement allows the guide protective cover assembly and the connecting cylinder 608 to seal the rotating shaft 12, preventing the reducing agent liquid from entering and ensuring the smooth rotation and sealing of the rotating shaft 12.

[0098] The inner side of the connecting cylinder 608 is provided with two sets of fourth bearings 607, which are sleeved on the outer side of the rotating shaft 12, so that the rotating shaft 12 can rotate smoothly through the fourth bearings 607.

[0099] This configuration provides a stable support structure for the nozzle assembly 6 from the rear of the rotating shaft 12.

[0100] Several sets of nozzles 605 are circular and equally spaced on the outside of the spray disk 603. The nozzles 605 are located at the rear between the cylindrical cover 10 and the first conical cylinder 601.

[0101] The rotating diffuser includes an end cap 7 fitted onto the rear end of the rotating shaft 12, and several sets of conical seats 702 fixed to the outer wall of the end cap 7 by an annular mesh frame 701. The several sets of conical seats 702 are circular and equally spaced, and the outer diameter of the conical seats 702 gradually increases from front to back.

[0102] The rear end of the ejector disc 603 is also connected to an annular stop 604, the end cap 7 is located inside the annular stop 604, and several sets of conical seats 702 are located outside the annular stop 604.

[0103] The effect of rotating diffusers on reducing agent liquids:

[0104] Periodic sealing of nozzle 605:

[0105] The rotating diffuser has several sets of conical seats 702 arranged in a circular shape and at equal intervals. During rotation, these seats periodically block the nozzles 605 on the ejection disk 603. Note that this blocking does not completely seal the nozzles 605.

[0106] When the conical seat 702 rotates to the rear of the nozzle 605, the reducing agent atomized from the nozzle 605 will continue to diffuse along the surface of the conical seat 702, further increasing the diffusion range of the reducing agent after atomization.

[0107] When the conical seat 702 leaves the nozzle 605, the reducing agent liquid can be atomized and sprayed out normally from the nozzle 605 again. This periodic blocking and opening changes the spraying rhythm of the reducing agent liquid.

[0108] Expand the atomization range of the reducing agent liquid:

[0109] As the outer diameter of the conical seat 702 gradually increases from front to back, during its rotation, the conical seat 702 at different positions guides and directs the reducing agent liquid sprayed from the nozzle 605 in different directions and to varying degrees. When the reducing agent liquid impacts the inclined surface of the conical seat 702, it is dispersed in different directions, thereby expanding the distribution range of the atomized reducing agent liquid. This wider distribution allows the reducing agent to contact the flue gas in boiler 1 more evenly, providing more sufficient conditions for the denitrification reaction and improving the reaction efficiency.

[0110] The function of the annular stop 604:

[0111] Guide the diffusion of reducing agent liquid:

[0112] The annular baffle 604 works in conjunction with several sets of conical seats 702 located on its outer side to guide the reducing agent liquid dispersed by the conical seats 702. The annular baffle 604 can create a relatively regular diffusion area around the reducing agent liquid, further optimizing the distribution of the reducing agent liquid in the boiler 1 and improving the denitrification reaction effect.

[0113] When the reducing agent liquid is injected into the boiler 1 through the nozzle 4, the reducing agent liquid pushes the rotor blade assembly, causing the rotor blade assembly to drive the rotary diffuser to rotate via the rotating shaft 12. The reducing agent liquid is accelerated after passing through the guide shield assembly and the nozzle assembly 6 in sequence, until it is atomized and sprayed out through the nozzle 605 on the spray plate 603. At the same time, the rotary diffuser is used to periodically block the nozzle 605 to expand the atomization range of the reducing agent liquid. This wider distribution allows the reducing agent to contact the flue gas in the boiler 1 more evenly, improving the comprehensiveness and efficiency of the denitrification reaction.

[0114] The various components of this invention are connected by screws, sleeves, and other methods, making the assembly process convenient and quick. For example, the nozzle assembly 6 is screwed to the end of the nozzle 4, facilitating disassembly and replacement; the rear end of the cylindrical cover 10 is sleeved on the outside of the connecting cylinder 608, and the fourth bearing 607 inside the connecting cylinder 608 is sleeved on the outside of the rotating shaft 12, ensuring the stability of the connection between components while also facilitating the individual installation and debugging of each component. This modular assembly method reduces assembly difficulty, improves production efficiency, and also facilitates later maintenance and repair.

[0115] In addition, to achieve the above objectives, the present invention also provides an SNCR denitrification system, including an ammonia injection mechanism of the SNCR denitrification system.

[0116] There are two main methods for adding ammonia in an SNCR denitrification system, which are usually selected based on the different ammonia sources:

[0117] Using ammonia water as the ammonia source:

[0118] First, ammonia water is stored in an ammonia water storage tank to ensure a continuous supply of sufficient ammonia water to the system. Then, the ammonia water is drawn from the storage tank by a transfer pump and pressurized and delivered to nozzle 4.

[0119] Nozzle 4 sprays ammonia water in a mist form into the high-temperature flue gas of equipment such as boiler 1. Under high-temperature conditions, the ammonia water rapidly evaporates and decomposes into ammonia gas, thereby achieving the addition of ammonia gas.

[0120] Using urea as an ammonia source:

[0121] Urea is first prepared into a urea solution, typically by dissolving solid urea in water to prepare a solution of a certain concentration, which is then stored in a urea solution storage tank. Next, the urea solution is pumped to a mixer, where it is mixed with dilution water in a specific ratio to obtain a concentration suitable for the reaction.

[0122] The solution is then conveyed to nozzle 4, which sprays the urea solution into the high-temperature flue gas. Under high temperature, the urea solution undergoes thermal decomposition and hydrolysis to generate ammonia, which then participates in the denitrification reaction.

[0123] Specifically, when using it:

[0124] Spray gun assembly insertion and locking: First, insert the spray nozzle 4 of the spray gun assembly into the boiler 1 via the insertion sleeve 2. During insertion, the docking plate assembly 5 rotates relative to the spray nozzle 4 and the locking plate 3.

[0125] The rear end of the abutment post 505 in the docking plate assembly 5 slides backward along the ramp groove 301 at the front end of the locking plate 3. During this process, the docking rotating plate 503 is rotated, so that the L-shaped buckle 504 is engaged in the corresponding L-shaped slot 302.

[0126] As the L-shaped buckle 504 is gradually inserted into the corresponding L-shaped slot 302, it abuts against the locking block 303, causing it to retract, and the spring 304 is in a compressed state. As the L-shaped buckle 504 continues to be inserted, the locking block 303 extends under the elastic force of the spring 304, fixing the L-shaped buckle 504 within the L-shaped slot 302. This achieves automatic locking and securing of the docking plate assembly 5 and the locking plate 3, ensuring the spray gun assembly is securely installed on the boiler 1.

[0127] Introduction and atomization of the reducing agent:

[0128] Urea solution or ammonia water is introduced through the reducing agent inlet 401, and compressed air is introduced through the compressed air inlet 402. The compressed air flows backward within the nozzle 4, and through the coordinated action of the nozzle assembly 6 of the spray gun assembly, atomizes the urea solution or ammonia water before spraying it into the boiler 1. Here, the compressed air is not pre-mixed with the reducing agent, but rather, through its flow and the structure of the nozzle assembly 6, the reducing agent is formed into fine droplets, thereby improving the reaction efficiency.

[0129] The operation of the rotating diffuser:

[0130] When the nozzle 4 injects reducing agent liquid into the boiler 1, the reducing agent liquid pushes the rotor blade assembly. The inclined blades 9 of the rotor blade assembly rotate under the impact of the reducing agent liquid. Since the connector 901 is sleeved on the outer side of the front end of the intermediate sleeve 802, and the front end of the rotating shaft 12 is fixedly connected to the middle of the rear end of the connector 901, the rotor blade assembly drives the rotating diffuser to rotate through the rotating shaft 12.

[0131] The reducing agent liquid passes sequentially through the guide shield assembly and the nozzle assembly 6. The outer diameter of the conical cover 11 of the guide shield assembly gradually increases from front to back, and the cylindrical cover 10 further guides the liquid flow, thereby increasing the speed of the reducing agent liquid.

[0132] In the nozzle assembly 6, the inner diameter of the first conical cylinder 601 gradually decreases from front to back, while the inner diameter of the second conical cylinder 602 gradually increases from front to back. This further accelerates and regulates the reducing agent liquid. Finally, the reducing agent liquid is atomized and sprayed out through the nozzle holes 605 on the spray plate 603.

[0133] The rotating diffuser has several sets of conical seats 702 arranged in a circular shape and evenly spaced, which periodically block the nozzles 605 during rotation. This periodic blocking expands the range of the reducing agent liquid atomization spray, allowing the reducing agent to be more evenly distributed in the boiler 1, thereby improving the efficiency of the denitrification reaction.

[0134] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ammonia injection mechanism for an SNCR denitrification system, comprising a spray gun assembly inserted into a boiler (1), characterized in that: The boiler (1) has a locking disc (3) connected to the side by a plug-in tube (2), and the spray gun assembly includes a spray pipe (4) and a docking disc assembly (5) that is rotatably sleeved on the spray pipe (4). After the nozzle (4) is inserted into the boiler (1) via the plug-in tube (2), the docking plate assembly (5) rotates relative to the nozzle (4) and the locking plate (3) until the docking plate assembly (5) and the locking plate (3) are automatically locked and fixed. The nozzle (4) is connected to a rotating shaft (12) by an annular bracket assembly. The rotating shaft (12) has a rotating wheel blade assembly at its front end. The nozzle (4) is screwed to a nozzle assembly (6). The middle rear end of the annular bracket assembly and the middle front end of the nozzle assembly (603) are provided with a guide protective cover assembly that is sleeved on the outside of the rotating shaft (12). The rear end of the rotating shaft (12) passes through the nozzle assembly (603) and is fixed with a rotating diffuser. When the reducing agent liquid is injected into the boiler (1) through the nozzle (4), the reducing agent liquid pushes the rotor blade assembly, which in turn drives the rotary diffuser to rotate through the rotating shaft (12). The reducing agent liquid accelerates after passing through the guide shield assembly and the nozzle assembly (6) in sequence, until the reducing agent liquid is atomized and sprayed out through the nozzle (605) on the spray plate (603). At the same time, the rotary diffuser is used to periodically block the nozzle (605) to expand the range of the reducing agent liquid atomization. The annular support assembly includes an annular frame (8) inside the end of the nozzle (4) and an intermediate sleeve (802) fixed inside the annular frame (8) by a connecting plate (801). The front end of the rotating shaft (12) extends through the middle sleeve (802). Two sets of second bearings (803) are sleeved on the front part of the rotating shaft (12). The two sets of second bearings (803) are arranged inside the middle sleeve (802). A sealing cylinder (804) is also provided at the rear of the interior of the middle sleeve (802). The sealing cylinder (804) is sleeved on the rotating shaft (12). The impeller blade assembly includes a connector (901) and inclined blades (9) that are equally spaced on the side of the connector (901). The connector (901) is sleeved on the outer front end of the intermediate sleeve (802), and the front end of the intermediate sleeve (802) is sleeved with a third bearing (902), which is located inside the rear end of the connector (901). The front end of the rotating shaft (12) is fixedly connected to the middle of the rear end of the connector (901); The guide shield assembly includes a conical shield (11) fixed to the rear end of the intermediate sleeve (802) and a cylindrical shield (10) fixed to the rear end of the conical shield (11). The outer diameter of the conical shield (11) gradually increases from front to back. The nozzle assembly (6) includes an externally threaded cylinder (606) screwed into the end of the nozzle pipe (4), a first conical cylinder (601) connected to the rear end of the externally threaded cylinder (606), and a second conical cylinder (602) connected to the rear end of the first conical cylinder (601). The inner diameter of the first conical cylinder (601) gradually decreases from front to back, and the inner diameter of the second conical cylinder (602) gradually increases from front to back. The spraying disc (603) is fixed at the connection between the first conical cylinder (601) and the second conical cylinder (602). A connecting cylinder (608) is provided at the middle of the front end of the spraying disc (603). The rear end of the cylindrical cover (10) is sleeved on the outside of the connecting cylinder (608). Two sets of fourth bearings (607) are provided on the inner side of the connecting cylinder (608). The two sets of fourth bearings (607) are sleeved on the outside of the rotating shaft (12). Several sets of nozzles (605) are circular and evenly distributed on the outside of the spray plate (603). The nozzles (605) are located at the rear between the cylindrical cover (10) and the first conical cylinder (601). The rotating diffuser includes an end cap (7) fitted around the rear end of the rotating shaft (12), and several sets of conical seats (702) fixed to the outer side wall of the end cap (7) by an annular mesh frame (701). The several sets of conical seats (702) are circular and evenly distributed, and the outer diameter of the conical seats (702) gradually increases from front to back. The rear end of the ejector plate (603) is also connected to an annular stop (604), the end cap (7) is located inside the annular stop (604), and several sets of conical seats (702) are located outside the annular stop (604).

2. The ammonia gas injection mechanism of an SNCR denitrification system according to claim 1, characterized in that: The nozzle (4) is provided with a reducing agent inlet (401) and a compressed air inlet (402) at the front end.

3. The ammonia gas injection mechanism of an SNCR denitrification system according to claim 1, characterized in that: The docking plate assembly (5) includes a fixed cylinder (501) screwed to the outside of the nozzle (4), a first bearing (506) centrally sleeved on the outside of the fixed cylinder (501), a docking rotating disk (503) sleeved on the outside of the first bearing (506), and an annular sealing cap (502) symmetrically screwed to both ends of the outside of the fixed cylinder (501). The rear end of the docking rotating disk (503) is provided with two sets of abutment posts (505) and two sets of L-shaped buckles (504). The front end of the locking disc (3) is provided with two sets of inclined grooves (301) and two sets of L-shaped slots (302). When the rear end of the abutment post (505) slides backward along the ramp groove (301), the L-shaped buckle (504) is engaged in the corresponding L-shaped groove (302).

4. The ammonia gas injection mechanism of an SNCR denitrification system according to claim 3, characterized in that: The outer wall of the annular sealing cover (502) is provided with an annular protrusion (5021), and the inner wall of the docking rotating disk (503) is provided with an annular groove (5031). The annular protrusion (5021) is disposed in the corresponding annular groove (5031).

5. The ammonia gas injection mechanism of an SNCR denitrification system according to claim 3, characterized in that: The rear side of the L-shaped slot (302) is fixed with a locking block (303) by a spring (304). When the L-shaped buckle (504) is gradually inserted into the corresponding L-shaped slot (302), the locking block (303) will retract under the resistance of the L-shaped buckle (504). At this time, the spring (304) is in a compressed state. After the L-shaped buckle (504) continues to be inserted into the corresponding L-shaped slot (302), the locking block (303) extends under the elastic force of the spring (304) until the locking block (303) fixes the L-shaped buckle (504) in the L-shaped slot (302).

6. An SNCR denitrification system, characterized in that, Includes the ammonia injection mechanism of the SNCR denitrification system as described in any one of claims 1-5.

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