Online adjustable multi-nozzle spray gun suitable for SNCR (selective non-catalytic reduction) system

Abstract

The invention discloses an online adjustable multi-nozzle spray gun suitable for an SNCR (selective non-catalytic reduction) system. The online adjustable multi-nozzle spray gun comprises a spray head assembly, a spray flow guide assembly and a driving assembly, the sprayer assembly comprises a rotating sleeve, the periphery of the rotating sleeve is connected with a turbine worm driving part, at least two nozzles are arranged at one end of the rotating sleeve, the other end of the rotating sleeve is connected with one end of the jet flow guide assembly in a nested mode, the other end of the jet flow guide assembly is connected with the driving assembly, and the driving assembly is used for driving the jet flow guide assembly to reciprocate. When the spraying flow guide assembly and the rotating sleeve are locked, the spraying flow guide assembly is communicated with any nozzle so as to achieve spraying of a reducing agent solution, and when the spraying flow guide assembly and the rotating sleeve are locked, the spraying flow guide assembly is communicated with any nozzle; and after the jet flow guide assembly and the rotating sleeve are unlocked, the turbine worm driving piece drives the rotating sleeve to rotate so as to adjust the nozzle connected to the jet flow guide assembly. The device has the characteristics of compact structure, simple principle, high use flexibility and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of denitrification of waste incineration flue gas, and particularly relates to an online adjustable multi-nozzle spray gun applicable to an SNCR system. Background Art

[0002] In the SNCR system of a waste incineration power plant, the spray gun and the nozzle are usually arranged in a fixed manner, and the insertion depth is generally only 400 mm to 700 mm or a shorter distance. Since the nozzle cannot be changed and atomized spraying is carried out in a fixed manner in the furnace, the spraying range is generally about 1 m to 2 m, and the coverage of the flue gas is small. Moreover, due to the complex working conditions in the incinerator, the phenomenon of uneven temperature field distribution on the boiler plane is likely to occur. And when spraying different types of reducing agents, the applicable nozzles are also different. If a fixed nozzle is used to spray different types of reducing agents, it is easy to cause uneven spraying of materials. In summary, since the nozzle of the spray gun cannot be switched and adjusted during use and cannot be adjusted according to the real-time working conditions in the furnace, the denitrification reaction is slow and incomplete, resulting in low denitrification efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies that the nozzle position of the existing spray gun is fixed and cannot be adjusted online, and to provide an online adjustable multi-nozzle spray gun applicable to an SNCR system with a simple principle, convenient operation and flexible use.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] An online adjustable multi-nozzle spray gun applicable to an SNCR system, comprising: a nozzle assembly, a spraying and guiding assembly, and a driving assembly. The spraying and guiding assembly is used for conveying a reducing agent solution and compressed air; the nozzle assembly includes a rotating sleeve, the outer periphery of the rotating sleeve is connected to a worm and gear driving member, at least two nozzles are provided at one end of the rotating sleeve, the other end of the rotating sleeve is nested and connected to one end of the spraying and guiding assembly, and the other end of the spraying and guiding assembly is connected to the driving assembly. The driving assembly is used for driving the spraying and guiding assembly to reciprocate, so as to lock or unlock the spraying and guiding assembly and the rotating sleeve. After the spraying and guiding assembly and the rotating sleeve are locked, the spraying and guiding assembly is communicated with any one of the nozzles to realize the spraying of the reducing agent solution; after the spraying and guiding assembly and the rotating sleeve are unlocked, the worm and gear driving member drives the rotating sleeve to rotate to adjust the nozzle connected to the spraying and guiding assembly.

[0006] As a further improvement of the present invention, the nozzle includes a first nozzle, a second nozzle, and a third nozzle. The first nozzle, the second nozzle, and the third nozzle all include an inner sleeve and an outer sleeve nested with each other; the injection and diversion assembly includes a connecting cylinder. A reducing agent diversion pipe and a compressed air diversion pipe are arranged in the connecting cylinder, and the discharge end of the compressed air diversion pipe is nested inside the discharge end of the reducing agent diversion pipe; when the connecting cylinder is locked with the rotating sleeve, the discharge end of the reducing agent diversion pipe is in sealed communication with the feed end of the outer sleeve, and the discharge end of the compressed air diversion pipe is in sealed communication with the feed end of the inner sleeve.

[0007] As a further improvement of the present invention, the outlet shapes of the first nozzle, the second nozzle, and the third nozzle are different from each other.

[0008] As a further improvement of the present invention, a connecting bracket is provided between the inner sleeve and the outer sleeve; a second groove is provided on the outer side wall of the feed end of the outer sleeve, and a first sealing ring is provided in the second groove to achieve sealed communication between the reducing agent diversion pipe and the outer sleeve; a first groove is provided on the inner side wall of the feed end of the inner sleeve, and a third groove is provided on the outer side wall of the discharge end of the compressed air diversion pipe, and a second sealing ring is provided in the third groove to achieve sealed communication between the compressed air diversion pipe and the inner sleeve.

[0009] As a further improvement of the present invention, a spring latch is provided on the inner side wall of the rotating sleeve, and a card slot is provided on the outer side wall of the connecting cylinder. The card slot matches the spring latch to lock or unlock the connecting cylinder and the rotating sleeve.

[0010] As a further improvement of the present invention, the spring latch includes a limit pin, a spring, and a hinge seat. One end of the spring is connected to the installation groove on the inner side wall of the rotating sleeve, the other end of the spring is connected to the limit pin, and one side of the limit pin is hinged to the inner side wall of the rotating sleeve through the hinge seat; when the connecting cylinder is locked with the rotating sleeve, the limit pin is locked in the card slot.

[0011] As a further improvement of the present invention, a steel ball slide rail is provided on the inner side wall of the rotating sleeve, and a guide rail groove is provided on the outer side wall of the connecting cylinder. The guide rail groove matches the steel ball slide rail to assist the rotating sleeve in rotating outside the connecting cylinder.

[0012] As a further improvement of the present invention, the turbine and worm drive includes a motor, a worm, and a gear; the gear is sleeved on the outer circumference of the rotating sleeve, one end of the worm is connected to the output end of the motor, and the other end of the worm meshes with the gear. Driven by the motor, the worm drives the gear to rotate, thereby realizing the rotation of the rotating sleeve to replace the nozzle connected to the injection and diversion assembly.

[0013] As a further improvement of the present invention, the driving assembly includes a cylinder, a connecting rod and a mounting plate. One end of the connecting rod is connected to the output end of the cylinder, and the other end of the connecting rod is provided with a mounting plate, and the mounting plate is fixedly connected to the injection and diversion assembly.

[0014] As a further improvement of the present invention, the side of the cylinder is provided with a first air inlet and a second air inlet, and both the first air inlet and the second air inlet are connected to the solenoid valve assembly to control the telescopic movement of the connecting rod.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] The online adjustable multi-nozzle spray gun applicable to the SNCR system of the present invention realizes the automatic rotation of the rotating sleeve by arranging a worm and gear drive on the outer circumference of the rotating sleeve; at least two different types of nozzles are provided at the front end of the rotating sleeve, and the rear end of the rotating sleeve is nested and connected with the front end of the injection and diversion assembly. The rear end of the injection and diversion assembly is connected to the driving assembly. Driven by the driving assembly, the injection and diversion assembly reciprocates, and the injection and diversion assembly can be automatically locked or unlocked with the rotating sleeve. When the injection and diversion assembly is locked with the rotating sleeve, the injection and diversion assembly is communicated with any one of the nozzles to realize the spraying of the reducing agent solution; when it is necessary to change the nozzle connected to the injection and diversion assembly, the driving assembly is used to drive the injection and diversion assembly to unlock with the rotating sleeve, and then the worm and gear drive is used to drive the rotating sleeve to rotate, so that another type of nozzle can be connected with the injection and diversion assembly, realizing the online automatic replacement of the atomizing nozzle, thereby changing the injection atomization effect, shape, distance, angle, etc., meeting the characteristics of the changing temperature field in the incineration boiler, and achieving the required coverage area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure principle of the online adjustable multi-nozzle spray gun applicable to the SNCR system in a specific embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the three-dimensional structure principle of the nozzle assembly in a specific embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the partial structure principle of the nozzle assembly in a specific embodiment of the present invention;

[0020] Figure 4 is Figure 3 a schematic diagram of the structural principle of the spring clip at position A in

[0021] Figure 5 is a schematic diagram of the side view structure principle of the nozzle assembly in a specific embodiment of the present invention;

[0022] Figure 6One of the schematic diagrams of the three-dimensional structural principle of the nozzle in the specific embodiment of the present invention;

[0023] Figure 7 One of the schematic diagrams of the three-dimensional structural principle of the nozzle in the specific embodiment of the present invention;

[0024] Figure 8 One of the schematic diagrams of the three-dimensional structural principle of the nozzle in the specific embodiment of the present invention;

[0025] Figure 9 Schematic diagram of the structural principle of the injection and diversion assembly in the specific embodiment of the present invention;

[0026] Figure 10 Schematic diagram of the structural principle of the front end of the injection and diversion assembly in the specific embodiment of the present invention;

[0027] Figure 11 Schematic diagram of the sectional structural principle inside the injection and diversion assembly in the specific embodiment of the present invention;

[0028] Figure 12 Schematic diagram of the structural principle of the drive assembly in the specific embodiment of the present invention;

[0029] Figure 13 Schematic diagram of the connection structural principle between the spring pin and the card slot when the nozzle assembly and the injection and diversion assembly of the present invention are unlocked;

[0030] Figure 14 Schematic diagram of the connection structural principle between the spring pin and the card slot when the nozzle assembly and the injection and diversion assembly of the present invention are locked;

[0031] Legend: 1. Nozzle assembly; 2. Injection and diversion assembly; 3. Drive assembly; 11. Rotating sleeve; 12. Nozzle; 121. First nozzle; 122. Second nozzle; 123. Third nozzle; 1211. Inner sleeve; 1212. Outer sleeve; 1213. First groove; 1214. Second groove; 1215. First sealing ring; 1216. Connection bracket; 13. Motor; 14. Worm; 15. Gear; 16. Spring pin; 161. Limit pin; 162. Spring; 163. Hinge seat; 17. Steel ball slide rail; 20. Connection cylinder; 21. Reducing agent diversion pipe; 22. Compressed air diversion pipe; 23. Card slot; 24. Guide rail groove; 25. Second sealing ring; 26. Third groove; 31. Cylinder; 32. Connecting rod; 33. Mounting plate; 34. First air inlet; 35. Second air inlet. Detailed implementation manners

[0032] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0035] Embodiment

[0036] As Figure 1 shown, the online adjustable multi-nozzle spray gun applicable to the SNCR system of the present invention includes: a nozzle head assembly 1, a spray guiding assembly 2, and a driving assembly 3; the spray guiding assembly 2 is used to convey the reducing agent solution and compressed air. The nozzle head assembly 1 includes a rotating sleeve 11, the outer periphery of the rotating sleeve 11 is connected to a worm and gear driving member, at least two different types of nozzles 12 are provided at the front end of the rotating sleeve 11, the rear end of the rotating sleeve 11 is nested and connected to the front end of the spray guiding assembly 2, the rear end of the spray guiding assembly 2 is connected to the driving assembly 3, and the driving assembly 3 is used to drive the spray guiding assembly 2 to reciprocate to lock or unlock the spray guiding assembly 2 and the rotating sleeve 11. When the spray guiding assembly 2 is locked with the rotating sleeve 11, the spray guiding assembly 2 is communicated with any one of the nozzles 12 to achieve the spraying of the reducing agent solution; when the spray guiding assembly 2 is unlocked from the rotating sleeve 11, the worm and gear driving member drives the rotating sleeve 11 to rotate to adjust the nozzle 12 connected to the spray guiding assembly 2, that is, to communicate another nozzle 12 on the rotating sleeve 11 with the spray guiding assembly 2.

[0037] In this embodiment, by arranging a worm and worm gear drive on the outer periphery of the rotating sleeve 11, the automatic rotation of the rotating sleeve 11 is realized; at least two different types of nozzles 12 are provided at the front end of the rotating sleeve 11, and the rear end of the rotating sleeve 11 is nested and connected to the front end of the injection and diversion assembly 2, and the rear end of the injection and diversion assembly 2 is connected to the drive assembly 3. Driven by the drive assembly 3, the injection and diversion assembly 2 reciprocates, and the automatic locking or unlocking of the injection and diversion assembly 2 and the rotating sleeve 11 can be realized. When the injection and diversion assembly 2 is locked with the rotating sleeve 11, the injection and diversion assembly 2 communicates with any one of the nozzles 12, and the spraying of the reducing agent solution is realized; when it is necessary to change the nozzle 12 connected to the injection and diversion assembly 2, the drive assembly 3 is used to drive the injection and diversion assembly 2 to unlock with the rotating sleeve 11, and then the worm and worm gear drive is used to drive the rotating sleeve 11 to rotate, so that another type of nozzle 12 can be connected to the injection and diversion assembly 2, realizing the on-line automatic replacement of the atomizing nozzle, thereby changing the injection atomization effect, shape, distance, angle, etc., meeting the characteristic requirements of the variable temperature field in the incineration boiler, and achieving the required coverage area.

[0038] As Figure 1 and Figure 3 shown, the nozzle 12 includes a first nozzle 121, a second nozzle 122 and a third nozzle 123. As Figure 5 shown, the outlet shapes of the first nozzle 121, the second nozzle 122 and the third nozzle 123 are different. That is, three different types of nozzles 12 are provided at the front end of the rotating sleeve 11 to meet the spraying requirements of different working conditions and different materials. In other embodiments, multiple nozzles 12 can also be arranged on the rotating sleeve 11 according to actual process requirements. The nozzle 12 can be fixed to the front end of the rotating sleeve 11 by welding, with good sealing performance and reliable connection.

[0039] As Figure 6 , Figure 7 and Figure 8 shown, the first nozzle 121, the second nozzle 122 and the third nozzle 123 all include an inner sleeve 1211 and an outer sleeve 1212 which are nested, and there is a mixing space between the outlet of the inner sleeve 1211 and the outlet of the outer sleeve 1212. After the compressed air and the reducing agent solution are mixed evenly in the mixing space, they are sprayed. It can be understood that the specific structural setting of the outlet of the nozzle 12 can adopt the conventional setting in the art and will not be elaborated here.

[0040] As Figure 9 , Figure 10 and Figure 11As shown, the injection and diversion assembly 2 includes a connecting cylinder 20. A reducing agent diversion pipe 21 and a compressed air diversion pipe 22 are arranged inside the connecting cylinder 20. The feeding ends of the reducing agent diversion pipe 21 and the compressed air diversion pipe 22 are both located at the rear end of the connecting cylinder 20, and the compressed air diversion pipe 22 extends outward from the connecting cylinder 20 to connect to a compressed air source. The discharging end of the compressed air diversion pipe 22 is nested inside the discharging end of the reducing agent diversion pipe 21 to facilitate connection to the nozzle 12. When the connecting cylinder 20 is locked with the rotating sleeve 11, the discharging end of the reducing agent diversion pipe 21 is in sealed communication with the feeding end of the outer sleeve pipe 1212, and the discharging end of the compressed air diversion pipe 22 is in sealed communication with the feeding end of the inner sleeve pipe 1211. The reducing agent is conveyed by the reducing agent diversion pipe 21 to the outer sleeve pipe 1212, and the compressed air is conveyed by the compressed air diversion pipe 22 to the inner sleeve pipe 1211. The compressed air provides the injection power to atomize and spray the reducing agent solution.

[0041] As Figure 8 shown, a connecting bracket 1216 is arranged between the inner sleeve pipe 1211 and the outer sleeve pipe 1212 to stably connect the inner sleeve pipe 1211 and the outer sleeve pipe 1212. A second groove 1214 is provided on the outer side wall of the feeding end of the outer sleeve pipe 1212, and a first sealing ring 1215 is arranged in the second groove 1214. Corresponding grooves (not shown in the figure) are also provided on the inner side wall of the discharging end of the reducing agent diversion pipe 21. After the outer sleeve pipe 1212 is inserted into the inside of the reducing agent diversion pipe 21, the reducing agent diversion pipe 21 is in sealed communication with the outer sleeve pipe 1212 to prevent the leakage of the reducing agent solution. As Figure 7 shown, a first groove 1213 is provided on the inner side wall of the feeding end of the inner sleeve pipe 1211, and a third groove 26 is provided on the outer side wall of the discharging end of the compressed air diversion pipe 22. A second sealing ring 25 is arranged in the third groove 26. After the compressed air diversion pipe 22 is inserted into the inside of the inner sleeve pipe 1211, the compressed air diversion pipe 22 is in sealed communication with the inner sleeve pipe 1211 to prevent the leakage of the compressed air.

[0042] As Figure 3 and Figure 4 shown, a spring detent 16 is arranged on the inner side wall of the rotating sleeve 11. As Figure 9 and Figure 11As shown, a clamping groove 23 is provided on the outer sidewall of the connecting cylinder 20. The clamping groove 23 is matched with the spring pin 16 to lock or unlock the connecting cylinder 20 and the rotating sleeve 11. In this embodiment, the numbers of the nozzle 12, the spring pin 16, and the clamping groove 23 correspond to each other. During the process of replacing the nozzle 12, when the rotating sleeve 11 rotates to a certain position, the spring pin 16 exactly matches the clamping groove 23. At this time, it can also ensure the alignment connection of the reducing agent guide pipe 21 with the outer sleeve pipe 1212 and the compressed air guide pipe 22 with the inner sleeve pipe 1211. It can be understood that in order to improve the connection reliability between the reducing agent guide pipe 21, the compressed air guide pipe 22 and the nozzle 12, corresponding position sensors can be provided on the spring pin 16 and the clamping groove 23. When receiving the signal from the sensor, the rotation of the rotating sleeve 11 is controlled to stop.

[0043] As Figure 4 shown, the spring pin 16 includes a limit pin 161, a spring 162, and a hinge seat 163. One end of the spring 162 is connected to the installation groove on the inner sidewall of the rotating sleeve 11, the other end of the spring 162 is connected to the limit pin 161, and one side of the limit pin 161 is hinged to the inner sidewall of the rotating sleeve 11 through the hinge seat 163. During the process of the connecting cylinder 20 and the rotating sleeve 11 being fitted and connected, through the action of the spring 162 and the hinge seat 163, the limit pin 161 can rotate and cooperate with the clamping groove 23. When the connecting cylinder 20 and the rotating sleeve 11 are locked, the limit pin 161 is locked in the clamping groove 23; when the connecting cylinder 20 and the rotating sleeve 11 are unlocked, the limit pin 161 is located outside the clamping groove 23.

[0044] As Figure 3 and Figure 5 shown, a steel ball slide rail 17 is provided on the inner sidewall of the rotating sleeve 11. As Figure 9 shown, a guide rail groove 24 is provided on the outer sidewall of the connecting cylinder 20. The guide rail groove 24 is matched with the steel ball slide rail 17 to assist the rotating sleeve 11 in rotating outside the connecting cylinder 20 and prevent the rotating sleeve 11 from getting stuck during rotation.

[0045] As Figure 1 and Figure 2As shown, the worm and gear drive member includes a motor 13, a worm 14, and a gear 15. The gear 15 is sleeved on the outer periphery of the rotating sleeve 11. One end of the worm 14 is connected to the output end of the motor 13, and the other end of the worm 14 meshes with the gear 15. Driven by the motor 13, the worm 14 drives the gear 15 to rotate, thereby realizing the rotation of the rotating sleeve 11 to replace the nozzle 12 connected to the injection and diversion assembly 2. By driving the rotating sleeve 11 to rotate through the worm and gear drive member, the nozzle 12 can be replaced online without removing the spray gun. It can be understood that in order to improve the efficiency of replacing the nozzle 12, the motor 13 can be connected to the pre-control system, and the rotation angle of the rotating sleeve 11 can be preset in the control system according to the positions of each nozzle 12 arranged at the end of the rotating sleeve 11. At the same time, the setting positions of different types of nozzles 12 at the end of the rotating sleeve 11 can also be pre-marked in the control system. When the corresponding nozzle 12 is needed, the rotating sleeve 11 can be rotated by the corresponding angle.

[0046] As Figure 1 and Figure 12 shown, the drive assembly 3 includes a cylinder 31, a connecting rod 32, and a mounting plate 33. One end of the connecting rod 32 is connected to the output end of the cylinder 31, and the other end of the connecting rod 32 is provided with a mounting plate 33, and the mounting plate 33 is fixedly connected to the injection and diversion assembly 2. Driven by the cylinder 31, the connecting rod 32 and the mounting plate 33 drive the injection and diversion assembly 2 to reciprocate.

[0047] Furthermore, a first air inlet 34 and a second air inlet 35 are provided on the side of the cylinder 31. Both the first air inlet 34 and the second air inlet 35 are connected to the solenoid valve assembly, and the solenoid valve assembly is connected to the compressed air source to control the telescopic movement of the connecting rod 32. It can be understood that the specific structure of the solenoid valve assembly is a conventional setting in this field and will not be elaborated here.

[0048] In this embodiment, the operation steps for replacing the nozzle 12 are as follows:

[0049] First step: The control system issues an instruction to replace the nozzle 12; for example, originally the first nozzle 121 is connected to the injection and diversion assembly 2, and the first nozzle 121 is used for spraying the reducing agent. Now, the first nozzle 121 is to be replaced with the second nozzle 122;

[0050] Second step: The cylinder 31 operates. After the second air inlet 35 intakes air, the connecting rod 32 moves backward, and the injection and diversion assembly 2 is driven to retreat by the mounting plate 33. The card slot 23 moves backward with the connecting tube 20, causing the spring pin 16 to retract, realizing the "unlocking" of the connecting tube 20 and the rotating sleeve 11, as Figure 14 shown. At this time, the injection and diversion assembly 2 is disconnected from the first nozzle 121;

[0051] Step 3: The motor 13 starts to operate, driving the rotating sleeve 11 to rotate. After the rotating sleeve 11 rotates to a preset angle, the motor 13 stops running. At this time, the reducing agent guide pipe 21 and the compressed air guide pipe 22 are aligned with the second nozzle 122;

[0052] Step 4: The cylinder 31 operates again. After the first air inlet 34 admits air, the connecting rod 32 moves forward, causing the spring pin 16 to snap into the card slot 23, realizing the "locking" of the connecting cylinder 20 and the rotating sleeve 11, as Figure 13 shown. At this time, the reducing agent guide pipe 21 and the compressed air guide pipe 22 are inserted into the second nozzle 122, and the reducing agent is sprayed by the second nozzle 122.

[0053] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. An online adjustable multi-nozzle spray gun applicable to the SNCR system, characterized in that, Comprising: a nozzle assembly (1), an injection and diversion assembly (2), and a drive assembly (3), wherein the injection and diversion assembly (2) is used for conveying a reducing agent solution and compressed air; the nozzle assembly (1) includes a rotating sleeve (11), the outer periphery of the rotating sleeve (11) is connected to a worm and gear drive, at least two nozzles (12) are provided at one end of the rotating sleeve (11), the other end of the rotating sleeve (11) is nested and connected to one end of the injection and diversion assembly (2), the other end of the injection and diversion assembly (2) is connected to the drive assembly (3), and the drive assembly (3) is used for driving the injection and diversion assembly (2) to reciprocate, so as to lock or unlock the injection and diversion assembly (2) and the rotating sleeve (11). After the injection and diversion assembly (2) is locked with the rotating sleeve (11), the injection and diversion assembly (2) is communicated with any one of the nozzles (12) to realize the spraying of the reducing agent solution; after the injection and diversion assembly (2) is unlocked from the rotating sleeve (11), the worm and gear drive drives the rotating sleeve (11) to rotate to adjust the nozzle (12) connected to the injection and diversion assembly (2).

2. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 1, characterized in that, The nozzle (12) includes a first nozzle (121), a second nozzle (122), and a third nozzle (123), and the first nozzle (121), the second nozzle (122), and the third nozzle (123) all include an inner sleeve (1211) and an outer sleeve (1212) nested with each other; the injection and diversion assembly (2) includes a connecting cylinder (20), a reducing agent diversion pipe (21) and a compressed air diversion pipe (22) are arranged in the connecting cylinder (20), and the discharge end of the compressed air diversion pipe (22) is nested inside the discharge end of the reducing agent diversion pipe (21); when the connecting cylinder (20) is locked with the rotating sleeve (11), the discharge end of the reducing agent diversion pipe (21) is hermetically communicated with the feed end of the outer sleeve (1212), and the discharge end of the compressed air diversion pipe (22) is hermetically communicated with the feed end of the inner sleeve (1211).

3. The adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 2, characterized in that, The outlet shapes of the first nozzle (121), the second nozzle (122), and the third nozzle (123) are different from each other.

4. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 2, wherein A connecting bracket (1216) is arranged between the inner sleeve (1211) and the outer sleeve (1212); a second groove (1214) is provided on the outer side wall of the feed end of the outer sleeve (1212), and a first sealing ring (1215) is arranged in the second groove (1214) to realize the hermetic communication between the reducing agent diversion pipe (21) and the outer sleeve (1212); a first groove (1213) is provided on the inner side wall of the feed end of the inner sleeve (1211), a third groove (26) is provided on the outer side wall of the discharge end of the compressed air diversion pipe (22), and a second sealing ring (25) is arranged in the third groove (26) to realize the hermetic communication between the compressed air diversion pipe (22) and the inner sleeve (1211).

5. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 2, wherein The inner side wall of the rotating sleeve (11) is provided with a spring catch (16), and the outer side wall of the connecting cylinder (20) is provided with a clamping groove (23). The clamping groove (23) is matched with the spring catch (16) to lock or unlock the connecting cylinder (20) and the rotating sleeve (11).

6. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 5, characterized in that, The spring catch (16) includes a limit pin (161), a spring (162) and a hinge seat (163). One end of the spring (162) is connected to the installation groove on the inner side wall of the rotating sleeve (11), and the other end of the spring (162) is connected to the limit pin (161). One side of the limit pin (161) is hinged to the inner side wall of the rotating sleeve (11) through the hinge seat (163). When the connecting cylinder (20) and the rotating sleeve (11) are locked, the limit pin (161) is locked in the clamping groove (23).

7. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 2, characterized in that, The inner side wall of the rotating sleeve (11) is provided with a steel ball slide rail (17), and the outer side wall of the connecting cylinder (20) is provided with a guide rail groove (24). The guide rail groove (24) is matched with the steel ball slide rail (17) to assist the rotating sleeve (11) to rotate outside the connecting cylinder (20).

8. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to any one of claims 1 to 7, characterized in that, The turbine worm drive includes a motor (13), a worm (14) and a gear (15). The gear (15) is sleeved on the outer circumference of the rotating sleeve (11). One end of the worm (14) is connected to the output end of the motor (13), and the other end of the worm (14) is meshed with the gear (15). Driven by the motor (13), the worm (14) drives the gear (15) to rotate, and then the rotating sleeve (11) rotates to replace the nozzle (12) connected to the injection and diversion assembly (2).

9. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to any one of claims 1 to 7, characterized in that, The drive assembly (3) includes a cylinder (31), a connecting rod (32) and a mounting plate (33). One end of the connecting rod (32) is connected to the output end of the cylinder (31), and the other end of the connecting rod (32) is provided with a mounting plate (33). The mounting plate (33) is fixedly connected to the injection and diversion assembly (2).

10. The online adjustable multi-nozzle spray gun applicable to the SNCR system according to claim 9, wherein, The side part of the cylinder (31) is provided with a first air inlet (34) and a second air inlet (35). Both the first air inlet (34) and the second air inlet (35) are connected to the solenoid valve assembly to control the telescopic movement of the connecting rod (32).

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