SNCR (selective non-catalytic reduction) reducing agent spraying and atomizing device

Abstract

The utility model discloses an SNCR (selective non-catalytic reduction) reducing agent spraying and atomizing device, and relates to the technical field of flue gas denitration. The outer gun barrel is of a closed structure, and an air inlet pipe and an air outlet pipe are arranged on the outer gun barrel; the inner gun barrel is arranged in the outer gun barrel, an air cavity communicated with the air inlet pipe and the air outlet pipe is formed between the inner gun barrel and the outer gun barrel, the tail end of the inner gun barrel extends out of the outer gun barrel and is connected with a liquid inlet pipe, and the front end of the inner gun barrel extends out of the outer gun barrel and is connected with a nozzle; the shield assembly is arranged at the front end of the outer gun barrel, connected with the air outlet pipe and arranged outside the nozzle in a covering mode so that an air curtain barrier can be formed on the windward side of the outer gun barrel in the working state. By means of the formed air curtain barrier, high-speed particles in a flue are blocked by the air curtain barrier and change the motion trail before making contact with the windward side of the outer gun barrel, so that the windward side of the front end of the spray gun cannot be directly impacted, and the service life of the device is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and more specifically, to an SNCR reducing agent injection atomization device. Background Technology

[0002] Selective non-catalytic reduction (SNCR) technology involves injecting a highly efficient ammonia denitrification reducing agent or urea solution (ammonia water) into high-temperature (500-850℃) flue gas. The NOx in the flue gas undergoes a denitrification reaction with the injected reducing agent at high temperature, thereby achieving the purpose of denitrification.

[0003] The key component in this process is the spray gun, and its atomization properties determine the efficiency and stability of the SNCR process. During the denitrification process, the spray gun is inserted into the flue. Due to the high temperature, high pressure, and high particulate matter environment inside the flue, the high-speed movement of particles can easily cause severe wear on the windward side of the spray gun tip, affecting the service life of the spray gun. Once the spray gun is worn, the atomization effect will be impaired or even completely lost, resulting in the reducing agent not achieving the denitrification effect after being sprayed into the furnace, thus failing to achieve the denitrification purpose. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art, and to propose an SNCR reducing agent spray atomization device.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An SNCR reducing agent spray atomization device, comprising:

[0007] Mounting base;

[0008] The outer barrel has a closed structure and is equipped with an air inlet and an air outlet.

[0009] The inner barrel is located inside the outer barrel and forms an air chamber with the outer barrel that communicates with the air inlet and air outlet pipes. The tail end of the inner barrel extends to the outside of the outer barrel and is connected to the liquid inlet pipe, and the front end extends to the outside of the outer barrel and is connected to the nozzle.

[0010] The protective shield assembly is located at the front end of the outer barrel and connected to the gas outlet pipe, and covers the outside of the nozzle, so as to form an air curtain barrier on the windward side of the outer barrel during operation.

[0011] Furthermore, the above solution includes a limiting seat on the outer barrel, which is located in front of the exhaust pipe to abut against the protective shield assembly, thus facilitating the limiting and positioning of the protective shield assembly.

[0012] Furthermore, the front part of the shield assembly has a conical structure to more effectively block high-speed particles and disperse the impact force of the particles along the conical surface.

[0013] Furthermore, the above solution includes:

[0014] The connecting shell has a receiving port in the middle for receiving the nozzle and the front end of the outer barrel, and the shell wall has a cavity and several air holes communicating with the cavity.

[0015] The air delivery tube connects to the cavity and is connected to the air outlet tube;

[0016] The connecting pipe is threaded and connected to the outside of the air guide pipe and the air outlet pipe to achieve a fixed connection between the air guide pipe and the air outlet pipe.

[0017] Furthermore, the above scheme further describes a conical structure with pores that decrease in size outwards.

[0018] Furthermore, the above-described solution includes, in addition to, the protective shield assembly:

[0019] The mesh cover is located at the front end of the connecting shell and in front of the nozzle, so that the mesh cover can directly physically intercept particulate matter with its mesh.

[0020] Furthermore, in the above scheme, the mesh size of the mesh cover is 0.2-0.3mm.

[0021] Furthermore, the above plan also includes:

[0022] The drive component is connected to the mounting base to make the mounting base swing and deflect, thereby expanding the atomization area and improving the de-atomization efficiency and effect.

[0023] Furthermore, in the above solution, the driving component includes:

[0024] Drive motor;

[0025] A deflector plate is connected to the motor shaft of the drive motor to enable left and right deflection.

[0026] The bracket is eccentrically mounted on the deflection plate and connected to the mounting base.

[0027] Furthermore, the above solution incorporates a servo motor as the drive motor.

[0028] Furthermore, the above scheme further specifies that the deflection angle of the bracket is 0-120°.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows: Through the coordinated design of the mounting base, outer barrel, inner barrel and protective cover assembly, this utility model can form an air curtain barrier on the windward side of the outer barrel by spraying gas. The air curtain barrier is a high-speed airflow layer, which changes the original airflow direction in the flue. This causes the high-speed particles in the flue to be blocked and have their trajectory changed before they come into contact with the windward side of the outer barrel, so that they cannot directly impact the windward side of the spray gun front end. In addition, the SNCR reducing agent sprayed through the nozzle will come into contact with the air curtain barrier and be impacted and sheared, making it more uniform and finer, which greatly improves the performance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0032] Figure 3 for Figure 1 A magnified view of part A in the diagram;

[0033] Figure 4 This is a schematic diagram showing the installation location of the mesh cover;

[0034] Figure 5 This is a schematic diagram of the installation position of the drive assembly; where: 1. Mounting base; 2. Outer barrel; 21. Air inlet pipe; 22. Air outlet pipe; 23. Limiting seat; 3. Inner barrel; 31. Liquid inlet pipe; 32. Nozzle; 4. Protective cover assembly; 41. Connecting shell; 411. Receiving port; 412. Cavity; 413. Air hole; 42. Air guide pipe; 43. Connecting pipe; 44. Mesh cover; 5. Drive assembly; 51. Drive motor; 52. Deflection plate; 53. Bracket. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0036] See attached document Figure 1 and attached Figure 2 As shown, an SNCR reducing agent spray atomization device includes:

[0037] Mounting bracket 1 serves to secure the installation.

[0038] The outer barrel 2 has a closed structure and is equipped with an air inlet pipe 21 and an air outlet pipe 22.

[0039] The inner barrel 3 is located inside the outer barrel 2 and forms an air chamber with the outer barrel 2 that communicates with the air inlet pipe 21 and the air outlet pipe 22. The tail end of the inner barrel 3 extends to the outside of the outer barrel 2 and is connected to the liquid inlet pipe 31, and the front end extends to the outside of the outer barrel 2 and is connected to the nozzle 32.

[0040] The protective cover assembly 4 is located at the front end of the outer barrel 2 and connected to the gas outlet pipe 22, and covers the outside of the nozzle 32 so that an air curtain barrier is formed on the windward side of the outer barrel 2 during operation.

[0041] In the specific implementation of this utility model, the mounting base 1 is used to securely install the entire device in a designated position. During use, the SNCR reducing agent is introduced through the liquid inlet pipe 31. The reducing agent enters the inner gun barrel 3 through the liquid inlet pipe 31 and is then sprayed out from the nozzle 32 connected to the front end for normal operation. The air inlet pipe 21 and the air outlet pipe 22 set on the outer gun barrel 2 form a gas circulation channel. The gas enters the gas chamber from the air inlet pipe 21 and finally enters the space of the protective cover assembly 4 from the air outlet pipe 22. When the device is in operation, these gases can be sprayed out to form an air curtain barrier on the windward side of the outer gun barrel 2. The air curtain barrier is a high-speed airflow layer that changes the original airflow direction in the flue. This causes the high-speed particles in the flue to be blocked and have their trajectory changed before they come into contact with the windward side of the outer gun barrel 2, thus preventing them from directly impacting the windward side of the spray gun front end. In addition, the SNCR reducing agent sprayed through the nozzle 32 will come into contact with the air curtain barrier and be impacted and sheared, making it more uniform and finer.

[0042] In the above scheme, the outer barrel 2 is provided with a limiting seat 23, and the limiting seat 23 is located in front of the gas pipe 22 so as to abut against the protective cover assembly 4, which facilitates the limiting and positioning of the protective cover assembly 4.

[0043] In the above scheme, the front part of the shield assembly 4 has a conical structure. When the gas enters the space of the shield assembly 4, the conical front end can focus the airflow and guide it to the windward area of ​​the outer gun barrel 2, forming a stronger and more concentrated air curtain barrier, which can more effectively block high-speed particles and disperse the impact force of the particles along the conical surface.

[0044] Specifically, regarding the structure of the protective cover assembly 4, please refer to the appendix. Figure 3 As shown, the shield assembly 4 includes:

[0045] The connecting shell 41 has a receiving port 411 in the middle for receiving the nozzle 32 and the front end of the outer barrel 2. The shell wall has a cavity 412 and a number of air holes 413 communicating with the cavity 412. The air holes 413 have a tapered structure with decreasing size outwards.

[0046] The air duct 42 is connected to the cavity 412 and the air outlet 22;

[0047] The connecting pipe 43 is threaded to the outside of the air guide pipe 42 and the air outlet pipe 22 to achieve a fixed connection between the air guide pipe 42 and the air outlet pipe 22.

[0048] During implementation, the air guide pipe 42 and the air outlet pipe 22 are fixedly connected by tightening the thread of the connecting pipe 43. This reliable connection method ensures that the gas can continuously and stably flow from the air outlet pipe 22 into the air guide pipe 42 and then into the cavity 412 of the connecting shell 41, providing a stable gas source support for the formation of the air curtain barrier. When it is necessary to inspect, clean or replace parts inside the protective cover assembly 4, the air guide pipe 42 and the air outlet pipe 22 can be easily separated by loosening the connecting pipe 43 with the appropriate tools. The operation is simple and quick, which greatly shortens the maintenance time, improves the maintainability of the equipment and reduces the maintenance cost.

[0049] In addition, considering the protective effect, therefore, please refer to the appendix. Figure 4 As shown, the shield assembly 4 also includes:

[0050] The mesh cover 44 is located at the front end of the connecting shell 41 and in front of the nozzle 32. The mesh cover 44 has a certain density of mesh structure. When high-speed particles in the flue move with the airflow to the vicinity of the protective cover assembly 4, the mesh cover 44 can directly physically intercept the particles with its mesh. For particles with a diameter larger than the mesh size, the mesh cover 44 can effectively prevent them from continuing to move forward, preventing them from impacting the connecting shell 41, the nozzle 32, and key components such as the outer gun barrel 2 and the nozzle 32 inside, greatly reducing the risk of these components being damaged by particle impact. For example, for flue particles with an average particle size of 0.3-0.5mm, the mesh cover 44 with a mesh size of 0.2mm can intercept more than 80% of the particles, significantly improving the protection effect. The mesh cover 44, together with the previous air curtain barrier, constitutes a multi-layer protection system, greatly enhancing the overall protection capability of the protective cover assembly 4 and providing more comprehensive and reliable protection for the device.

[0051] Regarding the above scheme, considering the processing effect of the device, therefore, refer to the appendix. Figure 5 As shown, an SNCR reducing agent spray atomization device further includes:

[0052] The drive component 5 is connected to the mounting base 1 so that the mounting base 1 can swing and deflect, thereby expanding the atomization area and improving the de-atomization efficiency and effect.

[0053] Specifically, driver component 5 includes:

[0054] Drive motor 51 is a servo motor;

[0055] The deflection plate 52 is connected to the motor shaft of the drive motor 51, so that it can perform a deflection action with a left and right deflection angle of 0-120°.

[0056] The bracket 53 is eccentrically mounted on the deflection plate 52 and connected to the mounting base 1;

[0057] During implementation, the drive assembly 5 uses the drive motor 51 as its power source. When the drive motor 51 operates, the rotation of the motor shaft drives the deflection plate 52 to deflect left and right, converting the deflection motion of the deflection plate 52 into the swing deflection of the mounting base 1. For example, when the deflection plate 52 deflects to the left or right at a certain angle, due to the eccentric position of the bracket 53, the mounting base 1 will swing along a specific trajectory, thereby driving the entire atomizing device mounted on it to swing. In this way, the atomization range of the reducing agent sprayed from the nozzle 32 is expanded, covering a wider area within the flue and improving the denitrification efficiency. The above shows and describes the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The above embodiments and descriptions in the specification are only illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An SNCR reducing agent spray atomization device, characterized in that: include: Mounting base (1); The outer barrel (2) has a closed structure and is equipped with an air inlet pipe (21) and an air outlet pipe (22). The inner barrel (3) is located inside the outer barrel (2) and forms an air chamber with the outer barrel (2) that is connected to the air inlet pipe (21) and the air outlet pipe (22). The tail end of the inner barrel (3) extends to the outside of the outer barrel (2) and is connected to the liquid inlet pipe (31), and the front end extends to the outside of the outer barrel (2) and is connected to the nozzle (32). The shield assembly (4) is located at the front end of the outer barrel (2) and connected to the air outlet pipe (22), and covers the outside of the nozzle (32) so that an air curtain barrier is formed on the windward side of the outer barrel (2) during operation.

2. The SNCR reducing agent spray atomizing device according to claim 1, characterized in that: The outer barrel (2) is provided with a limiting seat (23), and the limiting seat (23) is located in front of the gas pipe (22) to abut against the protective cover assembly (4).

3. The SNCR reducing agent spray atomization device according to claim 2, characterized in that: The front part of the protective cover assembly (4) has a conical structure.

4. The SNCR reducing agent spray atomizing device according to claim 3, characterized in that: The shield assembly (4) includes: The connecting shell (41) has a receiving port (411) in the middle for connecting the nozzle (32) and the front end of the outer barrel (2). The shell wall has a cavity (412) and several air holes (413) communicating with the cavity (412). The air duct (42) is connected to the cavity (412) and connected to the air outlet (22); The connecting pipe (43) is threaded to the outside of the air guide pipe (42) and the air outlet pipe (22) to achieve a fixed connection between the air guide pipe (42) and the air outlet pipe (22).

5. The SNCR reducing agent spray atomizing device according to claim 4, characterized in that: The pores (413) have a tapered structure with decreasing outward dimensions.

6. The SNCR reducing agent spray atomizing device according to claim 5, characterized in that: The shield assembly (4) also includes: The mesh cover (44) is located at the front end of the connecting shell (41) and in front of the nozzle (32).

7. The SNCR reducing agent spray atomizing device according to claim 6, characterized in that: The mesh size of the mesh cover (44) is 0.2-0.3mm.

8. The SNCR reducing agent spray atomizing device according to claim 7, characterized in that: Also includes: The drive component (5) is connected to the mounting base (1) to make the mounting base (1) swing and deflect.

9. The SNCR reducing agent spray atomizing device according to claim 8, characterized in that: The driving component (5) includes: Drive motor (51); The deflection plate (52) is connected to the motor shaft of the drive motor (51) so that it can deflect left and right. The bracket (53) is eccentrically mounted on the deflection plate (52) and connected to the mounting base (1).

10. The SNCR reducing agent spraying atomization device according to claim 9, characterized in that: The deflection angle of the bracket (53) is 0-120°.

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