A low-NOx emission ammonia water saving injection device for rotary kilns

Abstract

This utility model belongs to the field of industrial environmental protection technology and discloses a low-NOx emission ammonia water saving spraying device for rotary kilns. It includes a flue for conveying flue gas, an angle adjustment ring mounted on the flue, the angle adjustment ring being rotatably connected to the flue, and an angle adjustment drive assembly connected to the angle adjustment ring. The angle adjustment drive assembly is disposed on the flue, and multiple ammonia water atomizing spray guns are evenly distributed circumferentially on the angle adjustment ring. The ammonia water atomizing spray guns are connected to the angle adjustment ring via an adjustment assembly. The angle adjustment drive assembly can drive the angle adjustment ring and the ammonia water atomizing spray guns to achieve horizontal rotation adjustment circumferentially in the flue. The adjustment assembly can adjust the tilt angle of the ammonia water atomizing spray guns in the longitudinal direction of the flue, improving the ammonia water and NOx emission efficiency. x The reaction is more complete, reducing ammonia waste and enhancing the dual advantages of low nitrogen emissions and ammonia saving of the unit.

Description

Technical Field

[0001] This utility model belongs to the field of industrial environmental protection technology, specifically a low-nitrogen emission ammonia water saving spraying device for rotary kilns. Background Technology

[0002] Rotary kilns are widely used in industries such as cement and metallurgy. During the high-temperature calcination process, they generate large amounts of nitrogen oxides (NOx). x Direct discharge of ammonia into a rotary kiln would cause serious environmental pollution. To meet environmental protection requirements and reduce operating costs, a low-NOx emission ammonia injection device has emerged. This device reduces NOx emissions by injecting atomized ammonia into the rotary kiln and utilizing selective non-catalytic reduction (SNCR) to reduce NOx emissions. x Emissions should be controlled to ensure environmental protection.

[0003] However, in existing ammonia injection devices installed in flues, the ammonia atomizing spray guns are mostly installed at fixed angles, lacking a flexible angle adjustment mechanism to adapt to the flue gas environment. On the one hand, the flue gas flow field and temperature field within the flue are dynamically changing, and a fixed-angle spray gun cannot accurately spray ammonia to the optimal denitrification reaction window of 850-1100℃, easily leading to ammonia reacting with NO. x Incomplete reaction within the flue requires excessive ammonia injection to ensure denitrification, resulting in ammonia waste. Furthermore, the fixed angle leads to insufficient denitrification efficiency within the flue. x Emissions are difficult to meet standards, the spray gun cannot be adjusted to rotate horizontally around the flue, making it difficult to cover the denitrification needs of the entire cross-section of the flue gas. The tilt angle of the spray gun in the longitudinal direction of the flue cannot be flexibly adjusted, making it impossible to adapt to the temperature distribution at different heights in the flue, which further exacerbates the problems of ammonia waste and low denitrification efficiency.

[0004] Therefore, a low-NOx emission ammonia water saving injection device for rotary kilns is proposed to address the above problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a low-NOx emission ammonia water saving injection device for rotary kilns, which has the advantages of flexibly adjusting the angle of the ammonia water atomizing spray gun, accurately achieving low NOx emissions and significantly saving ammonia water consumption.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-NOx emission ammonia water saving injection device for rotary kilns, comprising a flue for conveying flue gas, an angle adjustment ring installed on the flue, the angle adjustment ring being rotatably connected to the flue, an angle adjustment drive assembly connected to the angle adjustment ring, the angle adjustment drive assembly being disposed on the flue, a plurality of ammonia water atomizing spray guns evenly distributed circumferentially on the angle adjustment ring, the ammonia water atomizing spray guns being connected to the angle adjustment ring via an adjustment assembly, a conveying pipe assembly being connected to the tail end of the ammonia water atomizing spray guns, the conveying pipe assembly being connected to an ammonia water conveying atomizing unit, and an ammonia water storage tank being connected to the inlet of the ammonia water conveying atomizing unit via a pipe.

[0007] Preferably, the angle adjustment drive assembly includes a gear ring fixed to the outside of the angle adjustment ring body. The gear ring is fixed at a position near the top of the angle adjustment ring body. The gear ring is meshed with a gear, and the gear is connected to a drive motor through a motor shaft.

[0008] Preferably, a support frame is provided on the flue at a position corresponding to the drive motor, and the drive motor is mounted on the support frame.

[0009] Preferably, the adjustment assembly includes circumferentially evenly distributed mounting slots on the angle adjustment ring, a rotatable frustum seat is installed in the mounting slot, a sealing structure is provided between the inner wall of the mounting slot and the frustum seat, the ammonia atomizing spray gun passes through and is installed on the frustum seat, a first rotating shaft is provided at the bottom of the ammonia atomizing spray gun near the tail end, the first rotating shaft is connected to an electric telescopic rod, and a second rotating shaft is connected to the end of the electric telescopic rod away from the first rotating shaft, the second rotating shaft being located on the angle adjustment ring.

[0010] Preferably, one end of the atomization outlet of the ammonia atomizing spray gun is located inside the angle adjustment ring, the tail end of the ammonia atomizing spray gun is located outside the angle adjustment ring, and a pipe joint is installed at the tail end of the ammonia atomizing spray gun, the pipe joint being connected to the delivery pipe assembly.

[0011] Preferably, the delivery pipe assembly includes a main fluid pipe connected to the outlet of the ammonia water delivery atomizing unit, an annular pipe connected to the end of the main fluid pipe, and multiple circumferentially evenly distributed guide hoses connected to the annular pipe, the ends of the guide hoses being connected to the pipe joints at the tail end of the ammonia water atomizing spray gun.

[0012] Preferably, the ammonia water delivery atomizing unit includes an ammonia water delivery pump for providing power for ammonia water delivery, a compressed air compressor for providing atomizing air source, a dual-path media filter for filtering impurities in ammonia water and compressed air, a flow regulating valve and a pressure stabilizing valve for precisely controlling the ammonia water flow rate and atomizing air pressure, a dual-fluid atomizing nozzle assembly for mixing ammonia water and compressed air and atomizing them into fine droplets, and a pressure sensor, a flow sensor, and a PLC control unit for real-time monitoring of operating parameters and automatic control.

[0013] Preferably, a flow control valve is installed on the pipeline between the ammonia water conveying atomizing unit and the ammonia water storage tank.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The angle adjustment drive assembly of this utility model can drive the angle adjustment ring and ammonia atomizing spray gun to achieve horizontal rotation adjustment in the circumference of the flue, thereby ensuring that the ammonia water can cover the entire cross-section of the flue gas in the flue, eliminating the denitrification blind zone, and allowing the ammonia water to react with NO. x The reaction within the flue is more complete, eliminating the need to compensate for insufficient coverage with excessive ammonia spray, effectively saving ammonia consumption while ensuring denitrification efficiency and contributing to NO reduction. x Emissions have been consistently met, fully achieving the design goals of energy conservation and low nitrogen emissions;

[0016] 2. The adjustment component of this utility model can adjust the tilt angle of the ammonia atomizing spray gun in the longitudinal direction of the flue, allowing it to flexibly adapt to the temperature distribution at different heights within the flue. This ensures that the ammonia is precisely sprayed to the optimal denitrification reaction window of 850-1100℃, further enhancing the sufficiency of the reaction between ammonia and NOx, reducing ammonia waste, and significantly improving denitrification efficiency, thus reducing NOx emissions. x The emissions continue to meet ultra-low standards, further reinforcing the dual advantages of low nitrogen emissions and ammonia water conservation from a vertical perspective. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the angle adjustment ring of this utility model;

[0019] Figure 3 This is a schematic diagram of the angle adjustment drive assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the adjustment component of this utility model;

[0021] Figure 5 This is a schematic diagram of the conveying pipe assembly of this utility model.

[0022] In the diagram: 1. Flue; 2. Angle adjustment ring;

[0023] 3. Angle adjustment drive assembly; 31. Gear ring; 32. Gear; 33. Drive motor; 34. Support connecting frame;

[0024] 4. Ammonia water atomizing spray gun;

[0025] 5. Adjustment component; 51. Mounting slot; 52. Frustum base; 53. First pivot; 54. Electric telescopic rod; 55. Second pivot;

[0026] 6. Delivery pipe assembly; 61. Main fluid pipe; 62. Ring pipe; 63. Flow guiding hose;

[0027] 7. Ammonia water conveying and atomizing unit; 8. Ammonia water storage tank; 9. Pipe joints; 10. Flow control valves. Detailed Implementation

[0028] 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.

[0029] like Figures 1 to 5 As shown, this utility model provides a low-NOx emission ammonia water saving injection device for rotary kilns, including a flue duct 1 for conveying flue gas. The flue duct 1 is the core reaction carrier of the device, and its interior needs to maintain a denitrification reaction temperature window of 850-1100℃ for ammonia water and NO. xThe reaction provides the necessary environment. An angle adjustment ring 2 is installed on the flue 1. The angle adjustment ring 2 can rotate around the flue 1, driving the ammonia atomizing spray gun 4 to rotate synchronously. This provides a basis for subsequent horizontal angle adjustment and avoids blind spots in flue gas coverage caused by fixing the ammonia atomizing spray gun 4. The angle adjustment ring 2 is rotatably connected to the flue 1 and is connected to an angle adjustment drive component 3. The angle adjustment drive component 3 provides power for the rotation of the angle adjustment ring 2, ensuring precise and controllable rotation of the angle adjustment ring 2 and the ammonia atomizing spray gun 4, avoiding errors and inconveniences from manual adjustment. The angle adjustment drive component 3 is set on the flue 1. Multiple ammonia atomizing spray guns 4 are evenly distributed circumferentially on the angle adjustment ring 2. The multiple ammonia atomizing spray guns 4 evenly distributed circumferentially can initially cover the cross section of the flue 1. With subsequent angle adjustment, the coverage integrity is further improved, ensuring full contact between ammonia and flue gas, and ammonia atomization... The ammonia atomizing spray gun 4 is connected to the angle adjustment ring 2 via an adjustment component 5. The adjustment component 5 allows for independent adjustment of the longitudinal tilt angle of the ammonia atomizing spray gun 4, adapting to the temperature distribution differences at different heights within the flue 1, ensuring that ammonia is accurately sprayed into the optimal reaction window. The tail end of the ammonia atomizing spray gun 4 is connected to a conveying pipe assembly 6, which provides a stable conveying channel for ammonia and atomizing gas, ensuring that the medium is delivered to each spray gun as needed. The conveying pipe assembly 6 is connected to an ammonia conveying atomizing unit 7, which integrates ammonia conveying, atomization, and parameter control, providing the ammonia atomizing spray gun 4 with ammonia that meets the requirements. This is crucial for ensuring denitrification efficiency and saving ammonia. The inlet of the ammonia conveying atomizing unit 7 is connected to an ammonia storage tank 8 via a pipeline. The ammonia storage tank 8 is used to store denitrification ammonia with a concentration of 20%-25%, providing a stable source of reducing agent for the system and avoiding frequent replenishment that could affect the continuous operation of the device.

[0030] Specifically, the angle adjustment drive assembly 3 includes a gear ring 31 fixed on the outside of the angle adjustment ring 2. The gear ring 31 rotates synchronously with the angle adjustment ring 2 and transmits power through tooth meshing to ensure stable rotational torque. The gear ring 31 is fixed at the top of the angle adjustment ring 2 and is meshed with a gear 32. The gear 32 is driven by a drive motor 33 to achieve speed reduction transmission, making the rotation speed of the angle adjustment ring 2 smooth and facilitating precise control of the rotation angle. The gear 32 is connected to the drive motor 33 through a motor shaft, and the drive motor 33 provides power to the gear 32. The rotation angle can be adjusted by PLC control to meet the angle requirements under different working conditions.

[0031] Furthermore, a support frame 34 is provided on the flue 1 at the position corresponding to the drive motor 33. The support frame 34 is made of high temperature resistant steel, which can securely fix the drive motor 33 and prevent the drive motor 33 from being displaced due to the vibration of the flue 1 or its own operation, thus ensuring the meshing accuracy of the gear 32 and the gear ring 31. The drive motor 33 is mounted on the support frame 34.

[0032] Furthermore, the adjustment component 5 includes circumferentially evenly distributed mounting slots 51 on the angle adjustment ring 2. The mounting slots 51 provide installation space for the frustum base 52, and their circumferential distribution corresponds to the positions of the ammonia atomizing spray guns 4, ensuring that each ammonia atomizing spray gun 4 can be adjusted independently. A rotatable frustum base 52 is installed within the mounting slots 51. The frustum base 52 can rotate around its own axis, providing a pivot point for the longitudinal angle adjustment of the ammonia atomizing spray gun 4. The structure of the frustum base 52 is adaptable to the mounting slots 51, ensuring installation stability. A sealing structure is provided between the inner wall of the mounting slot 51 and the frustum base 52. The sealing structure is made of high-temperature resistant flexible graphite material, preventing high-temperature flue gas in the flue 1 from leaking through the gap between the mounting slot 51 and the frustum base 52, thus avoiding heat loss and environmental pollution. The ammonia atomizing spray gun 4 passes through and is installed on the frustum base 52, and the ammonia atomizing spray gun 4 is fixedly connected to the frustum base 52. 2. When rotating, the ammonia atomizing spray gun 4 can be adjusted longitudinally, and the installation method facilitates the disassembly and maintenance of the ammonia atomizing spray gun 4. A first rotating shaft 53 is set at the bottom of the ammonia atomizing spray gun 4 near the tail end. The first rotating shaft 53 provides a connection fulcrum for the electric telescopic rod 54, so that the extension and retraction of the electric telescopic rod 54 can be converted into the rotational power of the ammonia atomizing spray gun 4. The first rotating shaft 53 is connected to the electric telescopic rod 54. Through precise control of the extension and retraction length, the longitudinal tilt angle of the ammonia atomizing spray gun 4 can be finely adjusted with an adjustment accuracy of ±1° to meet the adaptation requirements of different temperature windows. The end of the electric telescopic rod 54 away from the first rotating shaft 53 is connected to a second rotating shaft 55. The second rotating shaft 55 is fixed on the angle adjustment ring 2, providing fixed support for the electric telescopic rod 54 and ensuring stable torque transmission when the electric telescopic rod 54 extends and retracts. The second rotating shaft 55 is set on the angle adjustment ring 2.

[0033] It is worth noting that one end of the atomizing outlet of the ammonia atomizing spray gun 4 is located inside the angle adjustment ring 2. The atomizing outlet extends into the angle adjustment ring 2, allowing the atomized ammonia water to be directly sprayed into the flue 1, reducing ammonia water loss during transportation and shortening the contact distance between the atomized droplets and the flue gas, thus improving reaction efficiency. The tail end of the ammonia atomizing spray gun 4 is located outside the angle adjustment ring 2. The external tail end facilitates connection to the delivery pipe assembly 6 and subsequent maintenance, avoiding corrosion of the tail end connection components by high-temperature flue gas. Furthermore, the tail end of the ammonia atomizing spray gun 4 is equipped with a pipe connector 9, which is made of corrosion-resistant fluoropolymer-lined material, enabling quick disassembly and connection between the spray gun and the guide hose 63. Maintenance does not require complete disassembly, shortening downtime. The pipe connector 9 connects to the delivery pipe assembly 6.

[0034] It is worth noting that the conveying pipe assembly 6 includes a fluid main pipe 61 connected to the outlet of the ammonia water conveying atomizing unit 7. The fluid main pipe 61 is the main medium conveying channel, and the pipe diameter is designed according to the total flow of the system to ensure stable medium conveying pressure. The end of the fluid main pipe 61 is connected to an annular pipe 62, which can evenly distribute the medium to each guide hose 63, ensuring that the medium supply of each ammonia water atomizing spray gun 4 is consistent and avoiding differences in denitrification effect due to uneven supply. The annular pipe 62 is connected to multiple guide hoses 63 that are evenly distributed circumferentially. The guide hoses 63 are made of high-temperature resistant and aging-resistant fluororubber material, which has a certain degree of flexibility and can adapt to the positional changes when the angle of the ammonia water atomizing spray gun 4 is adjusted, avoiding pipe breakage due to pulling. The end of the guide hose 63 is connected to the pipe joint 9 at the tail end of the ammonia water atomizing spray gun 4.

[0035] It is worth mentioning that the ammonia water delivery atomizing unit 7 includes an ammonia water delivery pump to provide power for ammonia water delivery. This pump is a diaphragm pump, characterized by strong corrosion resistance and stable flow rate. The delivery pressure can be adjusted according to demand to avoid deterioration of atomization effect due to pressure fluctuations during ammonia water delivery. It also includes a compressed air compressor to provide the atomizing air source. The compressed air compressor provides high-pressure clean air, which, after mixing with ammonia water, achieves efficient atomization. The atomized droplet size can be controlled within 30-60μm, improving the ammonia water's ability to interact with NO. x The system includes a large reaction contact area, a dual-path media filter for filtering impurities from ammonia and compressed air (each path filters ammonia impurities and airborne dust separately, with a filter mesh size ≤50μm to prevent impurities from clogging the spray nozzle, ensuring atomization stability and reducing maintenance frequency), and a flow regulating valve and pressure stabilizing valve for precise control of ammonia flow and atomizing air pressure. The flow regulating valve can adjust the pressure according to the NO content inside the kiln. x The ammonia flow rate is dynamically adjusted with an accuracy of ±1% to avoid excessive ammonia injection; a pressure stabilizing valve maintains stable atomizing air pressure to ensure consistent atomization effect; a dual-fluid atomizing nozzle assembly mixes ammonia with compressed air and atomizes it into fine droplets; the dual-fluid nozzle adopts a Laval structure, which has high atomization efficiency and is not prone to scaling, further reducing ammonia waste; and pressure sensors, flow sensors, and a PLC control unit are used for real-time monitoring of operating parameters and automatic control. The sensors collect pressure, flow rate, and NO in real time. x Based on parameters such as concentration, the PLC control unit automatically adjusts the unit's operating status to achieve "on-demand ammonia injection," reducing manual intervention and significantly improving ammonia water utilization.

[0036] It is worth emphasizing that a flow control valve 10 is installed on the pipeline between the ammonia water conveying atomizing unit 7 and the ammonia water storage tank 8. The flow control valve 10 is a pneumatic quick-cut valve, which can adjust the ammonia water delivery volume under normal operating conditions. When the system malfunctions, it can quickly cut off the ammonia water supply to avoid ammonia water leakage or excessive delivery, thus ensuring the safe operation of the system and saving ammonia water.

[0037] Among them, the drive motor 33, the electric telescopic rod 54, and the ammonia water conveying atomizing unit 7 are existing technologies and will not be described in detail; at the same time, this utility model also includes a power supply, a controller, and a switch, which are not the main technical points of this patent and will not be described in detail.

[0038] Working principle and process: First, the 20%-25% concentration denitrification ammonia water stored in the ammonia water storage tank 8, after being regulated by the flow control valve 10 on the pipeline between the tank and the ammonia water delivery atomizing unit 7, enters the ammonia water delivery atomizing unit 7. The ammonia water delivery pump in the unit 7 provides the delivery power, the dual-path media filter filters impurities in the ammonia water and compressed air, the compressed air compressor provides the atomizing air source, the flow regulating valve and pressure stabilizing valve precisely regulate the parameters, and the dual-fluid atomizing nozzle assembly mixes the ammonia water and compressed air and atomizes them into fine droplets of 30-60μm. The pressure sensor and flow sensor monitor the parameters in real time and realize automatic adjustment through the PLC control unit to ensure that the atomized ammonia water meets the denitrification requirements. Subsequently, the qualified atomized ammonia water is delivered to the annular pipe 62 through the fluid main pipe 61 of the delivery pipe group 6. The annular pipe 62 evenly distributes it to each guide hose 63, and then atomizes it with ammonia water. The pipe connector 9 at the tail end of the spray gun 4 is inserted into the spray gun 4. At the same time, the drive motor 33 of the angle adjustment drive component 3 drives the gear 32 to rotate. The gear 32 meshes with the gear ring 31 on the outer side of the angle adjustment ring 2, causing the angle adjustment ring 2 to rotate around the flue 1. This, in turn, causes the ammonia water atomizing spray gun 4 on the ring to rotate horizontally, achieving full coverage of the flue gas cross section in the flue 1. The electric telescopic rod 54 of the adjustment component 5 pushes the ammonia water atomizing spray gun 4 through the first rotating shaft 53, causing the spray gun 4 to rotate around the frustum seat 52 in the mounting groove 51. This precisely adjusts the longitudinal tilt angle of the spray gun 4, ensuring that it sprays the atomized ammonia water into the flue 1 into the optimal denitrification reaction window of 850-1100℃. Finally, the atomized ammonia water fully reacts with the nitrogen oxides flowing in the flue 1, achieving low nitrogen emissions. Furthermore, due to the precise angle control and automatic parameter adaptation throughout the process, excessive ammonia water injection is avoided, achieving the goal of saving ammonia water.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] 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 low-NOx emission ammonia water saving injection device for rotary kilns, comprising a flue (1) for conveying flue gas, characterized in that: An angle adjustment ring (2) is installed on the flue (1). The angle adjustment ring (2) is rotatably connected to the flue (1). An angle adjustment drive assembly (3) is connected to the angle adjustment ring (2). The angle adjustment drive assembly (3) is located on the flue (1). Multiple ammonia atomizing spray guns (4) are evenly distributed in a circumferential direction on the angle adjustment ring (2). The ammonia atomizing spray guns (4) are connected to the angle adjustment ring (2) through an adjustment assembly (5). The tail end of the ammonia atomizing spray gun (4) is connected to a conveying pipe assembly (6). The conveying pipe assembly (6) is connected to an ammonia conveying atomizing unit (7). The inlet of the ammonia conveying atomizing unit (7) is connected to an ammonia storage tank (8) through a pipe.

2. The low-NOx emission ammonia water saving injection device for rotary kilns according to claim 1, characterized in that: The angle adjustment drive assembly (3) includes a gear ring (31) fixed on the outside of the angle adjustment ring (2). The gear ring (31) is fixed at the top of the angle adjustment ring (2). The gear ring (31) is meshed with a gear (32). The gear (32) is connected to a drive motor (33) through a motor shaft.

3. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 2, characterized in that: A support frame (34) is provided on the flue (1) at a position corresponding to the drive motor (33), and the drive motor (33) is mounted on the support frame (34).

4. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 1, characterized in that: The adjustment assembly (5) includes mounting grooves (51) evenly distributed in the circumference on the angle adjustment ring (2). A rotatable frustum base (52) is installed in the mounting groove (51). A sealing structure is provided between the inner wall of the mounting groove (51) and the frustum base (52). The ammonia atomizing spray gun (4) passes through and is installed on the frustum base (52). A first rotating shaft (53) is provided at the bottom of the ammonia atomizing spray gun (4) near the tail end. The first rotating shaft (53) is connected to an electric telescopic rod (54). The end of the electric telescopic rod (54) away from the first rotating shaft (53) is connected to a second rotating shaft (55). The second rotating shaft (55) is located on the angle adjustment ring (2).

5. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 1, characterized in that: One end of the atomizing outlet of the ammonia atomizing spray gun (4) is located inside the angle adjustment ring (2), and the tail end of the ammonia atomizing spray gun (4) is located outside the angle adjustment ring (2). The tail end of the ammonia atomizing spray gun (4) is equipped with a pipe joint (9), which is connected to the delivery pipe assembly (6).

6. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 5, characterized in that: The delivery pipe assembly (6) includes a fluid main pipe (61) connected to the outlet of the ammonia water delivery atomizing unit (7). The end of the fluid main pipe (61) is connected to an annular pipe (62). The annular pipe (62) is connected to a plurality of circumferentially evenly distributed guide hoses (63). The end of the guide hoses (63) is connected to the pipe joint (9) at the tail end of the ammonia water atomizing spray gun (4).

7. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 1, characterized in that: The ammonia water delivery atomizing unit (7) includes an ammonia water delivery pump for providing power for ammonia water delivery, a compressed air compressor for providing atomizing air source, a dual-path media filter for filtering impurities in ammonia water and compressed air, a flow regulating valve and a pressure stabilizing valve for precisely controlling the ammonia water flow rate and atomizing air pressure, a dual-fluid atomizing nozzle assembly for mixing ammonia water and compressed air and atomizing them into fine droplets, and a pressure sensor, a flow sensor and a PLC control unit for real-time monitoring of operating parameters and automatic control.

8. A low-NOx emission ammonia water saving injection device for rotary kilns according to claim 1, characterized in that: A flow control valve (10) is installed on the pipeline between the ammonia water conveying atomizing unit (7) and the ammonia water storage tank (8).

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