A new type of high-efficiency anti-blocking two-fluid nozzle spray gun

Abstract

The utility model relates to a flue gas denitration equipment field especially relates to a novel high -efficient anti -blocking double -fluid nozzle spray gun, including the outer tube and the inner tube of coaxial setting in the inner tube of outer tube, the rear end of outer tube is provided with the plug, and the centre of plug is equipped with the axial mounting hole, and the rear end of inner tube is sealed and fixed in the axial mounting hole and stretches into, and the liquid phase joint is installed in the axial mounting hole, and the rear end of liquid phase joint is communicated with the inner tube, the side surface rear section of outer tube is equipped with the gas inlet, and the gas phase joint is fixedly installed at the gas inlet, and the filter screen is equipped between the inner tube and liquid phase joint, and the inner wall of inner tube is equipped with the helical guide groove along the axial, is used for guiding the liquid flow rate that passes through to accelerate, the front end fixedly connected with the mounting seat of outer tube, the utility model can improve atomization efficiency, realizes more careful even liquid drop distribution through optimizing liquid gas mixing channel and spray orifice angle, reduces energy consumption, reduces gas consumption, promotes gas liquid mixing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification equipment, and in particular to a novel high-efficiency anti-clogging dual-fluid nozzle spray gun. Background Technology

[0002] Currently, dual-fluid nozzles (also known as gas-liquid mixing nozzles) are commonly used in industrial waste gas treatment, evaporative cooling, and liquid spray drying systems to perform atomization operations. Dual-fluid nozzles utilize compressed air (or steam) to mix and exchange energy with liquid within the nozzle, thereby cutting the liquid into fine droplets and improving evaporation efficiency or reaction rate.

[0003] However, existing dual-fluid nozzles still have the following technical problems in practical industrial applications:

[0004] 1. Uneven atomization, particles too large

[0005] Traditional nozzles have a simple gas-liquid mixing zone structure, uneven airflow velocity field, insufficient liquid splitting, and atomized particle size that is usually large (100-200μm), which cannot meet the requirements of fine evaporation or full reaction and easily leads to uneven gas-liquid distribution.

[0006] 2. The spray has a small coverage area and low evaporation efficiency.

[0007] Because the spray angle is limited by the mixing structure and the outlet shape, the spray cone angle is usually small, resulting in a limited spray coverage area and insufficient evaporation or cooling in some areas of the system.

[0008] 3. Serious problems with wet bottom, water sticking to the walls, and water runoff.

[0009] In evaporative cooling towers or flue gas ducts, if the droplets are too large or unevenly distributed, they will condense into a liquid film on the wall, causing "wet bottom" and "wall adhesion" phenomena. This not only affects the safe operation of the equipment, but also corrodes the pipe wall or reduces the efficiency of dust removal and denitrification.

[0010] 4. Prone to clogging and requires frequent maintenance

[0011] Industrial waste liquids or solutions containing solid particles (such as ammonia, lime slurry, and denitrification waste liquid) are prone to depositing inside the nozzle or at the outlet, causing nozzle blockage or spray distortion, which affects the continuous operation of the system.

[0012] 5. Backflushing cleaning effect is not ideal.

[0013] Most existing backflush structures use a simple air path switching form, which has insufficient airflow impact force or unreasonable backflush direction, and cannot effectively remove residual liquid or solid deposits inside the nozzle.

[0014] Therefore, it is necessary to further improve the nozzles and spray guns used for flue gas denitrification. Utility Model Content

[0015] The technical problem to be solved by this utility model is to overcome the existing defects and provide a new type of high-efficiency anti-clogging dual-fluid nozzle spray gun, which improves atomization efficiency. By optimizing the liquid-gas mixing channel and the nozzle angle, a more delicate and uniform droplet distribution is achieved, reducing energy consumption, reducing gas consumption, and improving gas-liquid mixing efficiency, which can effectively solve the problems in the background art.

[0016] To achieve the above objectives, the present invention provides the following technical solution: a novel high-efficiency anti-clogging dual-fluid nozzle spray gun, comprising an outer tube and an inner tube coaxially disposed inside the outer tube, wherein a plug is provided at the rear end of the outer tube, and an axial mounting hole is provided at the center of the plug, the rear end of the inner tube extends into and is sealed and fixed in the axial mounting hole, and a liquid phase connector is installed in the axial mounting hole, the liquid phase connector being connected to the rear end of the inner tube.

[0017] An air inlet is provided on the rear section of the side surface of the outer tube, and a gas phase connector is fixedly installed at the air inlet. A filter screen is provided between the inner tube and the liquid phase connector. A spiral guide groove is provided on the inner wall of the inner tube along the axial direction to guide and accelerate the flow rate of the liquid passing through.

[0018] The front end of the outer tube is fixedly connected to a mounting base, and the front end of the inner tube extends into and is sealed and fixed in the mounting base. A first through hole is provided on the mounting base.

[0019] The mounting base is threadedly connected to a spray assembly, and the mounting base has a second through hole that corresponds to and communicates with the first through hole.

[0020] The spray assembly includes a connector, a nozzle, and an annular baffle. The connector has a hollow tube coaxial with the inner tube at its center. The rear end of the hollow tube is threaded into the mounting base, and the front end of the hollow tube extends into the nozzle. The nozzle is fixed to the front end of the connector by a locking nut. The annular baffle is located inside the nozzle, and its edge stepped surface is clamped and fixed by the mating end face of the connector and the nozzle. The nozzle has a liquid outlet hole at its front end.

[0021] Preferably, a gas phase flow space is formed between the outer tube and the inner tube, and the gas phase connector is connected to the first through hole through the gas phase flow space.

[0022] Preferably, an annular groove is provided between the mating end faces of the connecting seat and the mounting seat, and a sealing gasket is embedded inside the annular groove to prevent gas from leaking from the mating point of the first through hole and the second through hole.

[0023] Preferably, the first through hole and the second through hole are arranged in a ring array, with at least 4 of each, and the number of the first through hole and the second through hole are equal and their positions correspond.

[0024] Preferably, the front end of the hollow tube 11 extends into the interior of the annular baffle, forming an annular flow gap with the inner wall of the annular baffle to allow gas to pass through at high speed.

[0025] Preferably, the inner wall of the annular baffle is a two-section conical structure, consisting of a 65° cone angle section and a 30° cone angle section from back to front, used to compress the gas step by step and accelerate its ejection.

[0026] Preferably, the hollow tube and the inner tube are coaxially aligned, and the liquid in the inner tube enters the gas-liquid mixing chamber inside the nozzle directly through the hollow tube.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] Improved atomization efficiency: Achieves a finer and more uniform droplet distribution by optimizing the liquid-gas mixing channel and nozzle angle; Reduced energy consumption: Reduces gas consumption and improves gas-liquid mixing efficiency; Anti-clogging design: Employs a smooth channel and conical mixing chamber to reduce particulate matter deposition; Extended lifespan and easier maintenance: Modular design (nozzle body, mixing core, and gun body can be disassembled) facilitates cleaning and replacement; Enhanced applicability: Suitable for various industrial spraying scenarios such as denitrification, cooling, dust removal, humidification, and rapid cooling. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the spray assembly structure of this utility model;

[0031] Figure 3 This is a schematic diagram of the explosion of the spray assembly of this utility model;

[0032] Figure 4 This is a schematic diagram of the connector structure of this utility model;

[0033] Figure 5 This is a cross-sectional schematic diagram of the spray assembly of this utility model;

[0034] Figure 6 This is a schematic cross-sectional view of the outer tube and the rear section of the inner tube of this utility model.

[0035] Explanation of reference numerals in the attached drawings: 1. Outer tube; 2. Mounting base; 3. Gas phase connector; 4. Plug; 5. Liquid phase connector; 6. Connecting base; 7. Locking nut; 8. Nozzle; 9. Liquid outlet hole; 10. First through hole; 11. Hollow tube; 12. Sealing gasket; 13. Second through hole; 14. Annular baffle; 15. Spiral guide groove; 16. Inner tube; 17. Filter screen. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, if directional descriptions are involved, such as "up," "down," "front," "back," "left," "right," etc., indicating directional or positional relationships, they are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this application and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0038] Please see Figure 1-6 The present invention provides the following technical solution:

[0039] A novel high-efficiency anti-clogging dual-fluid nozzle spray gun is used for denitrification atomization of flue gas in cement kilns. The spray gun is composed of an outer tube 1, an inner tube 16, a plug 4, a liquid phase connector 5, a gas phase connector 3, a mounting base 2, and a spray assembly. The gas and liquid channels are arranged coaxially. The gas flows through the annular space between the outer tube 1 and the inner tube 16, and the liquid flows through the central channel of the inner tube 16. The two achieve high-speed impact atomization in the nozzle 8.

[0040] The rear connection structure between the outer tube and the inner tube:

[0041] The outer tube 1 is made of 304 stainless steel, with internal threads machined on the inner wall of the rear end. The plug 4 is made of stainless steel, with external threads corresponding to those of the outer tube 1 and axial mounting holes machined on the outer wall of the plug 4. Two O-ring grooves are machined inside the holes, and two nitrile rubber O-rings are embedded in them.

[0042] The plug 4 is threaded into the outer tube 1 and is axially pressed and sealed with the outer tube 1 by the O-ring fitted on the outer wall. The inner tube 16 is made of 304 stainless steel and is inserted into the axial mounting hole at the rear end and has an interference fit of 0.1mm with the O-ring to achieve radial sealing. The O-ring prevents liquid from leaking out along the gap between the plug 4 and the inner tube 16.

[0043] The liquid phase connector 5 is a stainless steel quick-connect connector, which is welded to the axial mounting hole of the plug 4. The liquid phase connector 5 can be a threaded tube or a quick-release plug structure, which can be connected to an external liquid inlet pipe to ensure that the liquid can enter the inner tube 16 through the liquid phase connector 5.

[0044] A filter screen 17 is fitted between the inner tube 16 and the liquid phase connector 5. The filter screen 17 can be made of stainless steel and is cylindrical in shape. The diameter of the filter screen 17 is smaller than the diameter of the inner tube 16. The filter screen 17 is placed at the rear end of the inner tube 16, and its edge is pressed between the inner tube 16 and the liquid phase connector 5. When the liquid enters the inner tube 16, it first passes through the filter screen 17 to prevent the nozzle from being blocked. The filter screen 17 can also be quickly replaced.

[0045] Air inlet and pre-acceleration structure:

[0046] An air inlet is provided on the rear section of the side surface of the outer tube 1. The gas phase connector 3 is welded to the outer tube 1 corresponding to the air inlet. The gas phase connector 3 can be the same connector as the liquid phase connector 5, and their models and specifications are the same. Compressed air can enter the gas phase flow space between the outer tube 1 and the inner tube 16 through the gas phase connector 3.

[0047] The inner wall of the inner tube 16 is machined with a spiral guide groove 15 by a CNC milling machine, which extends axially to the front end of the inner tube 16. After the liquid is filtered by the filter screen 17 to remove impurities, it enters the inner tube 16. Guided by the spiral groove 15, the centrifugal force causes the liquid film to rotate against the wall, and the flow state changes from laminar flow to turbulent flow, which increases the outlet linear velocity and ensures its atomization effect.

[0048] Connection between the front end of the outer tube and the mounting base:

[0049] The inner wall of the front end of the outer tube 1 is machined with an internal thread, and the mounting seat 2 is machined with a corresponding external thread. The center of the mounting seat 2 is machined with a through hole with an internal thread. The front end of the inner tube 16 and the through hole of the mounting seat 2 are laser welded to seal the perimeter. Eight first through holes 10 are drilled evenly along the annular pattern on the end face of the mounting seat 2. The first through holes 10 are drilled obliquely. The annular array makes the airflow symmetrical and improves the atomization effect.

[0050] Air in the gas phase flow space can enter the spray assembly through the first through hole 10, and liquid in the inner tube 16 can enter the spray assembly through the through hole in the center of the mounting base 2.

[0051] Overall assembly of the spray assembly:

[0052] The spray assembly includes a connector 6, a hollow tube 11, a sealing gasket 12, an annular baffle 14, a nozzle 8, and a locking nut 7.

[0053] A hollow tube 11 is integrally machined at the center of the connecting seat 6. The rear section of the hollow tube 11 is machined with external threads to engage with the inner hole of the mounting seat 2. An annular groove is machined on the mating end face to embed a silicone rubber sealing gasket 12. The outer diameter of the front section gradually narrows to a bevel and extends into the nozzle 8. Eight second through holes 13 are uniformly drilled in an annular pattern on the end face of the connecting seat 6, which correspond to the positions of the first through holes 10 and have the same diameter.

[0054] The inner wall of the annular baffle 14 is two conical sections, with a 65° cone angle at the rear and a 30° cone angle at the front. The minimum inner diameter is larger than the outer diameter of the front section of the hollow tube 11, ensuring that there is a gap between the annular baffle 14 and the hollow tube 11. The edge is machined with a 1.2mm thick step.

[0055] The nozzle 8 has a uniformly drilled annular liquid outlet hole 9 on its front conical surface. The inner cavity is a gas-liquid mixing cavity. The nozzle 8 is placed in the middle of the locking nut 7 and is threadedly connected to the connecting seat 6. The nozzle 8 can be pressed tightly against the front end of the connecting seat 6. The baffle plate 14 is clamped and fixed. The annular baffle plate 14 and the connecting seat 6 form a gas receiving cavity.

[0056] The gas first enters the gas receiving cavity through the first through hole 10 and the second through hole 13. Then, it passes through the annular gap formed by the outer wall of the hollow tube 11 and the inner wall of the baffle 14. The high-speed gas is compressed along the 65° conical surface and enters the 30° conical surface. Due to the reduction of the flow channel cross section, the gas is compressed, and a negative pressure is generated at the end of the hollow tube 11, thereby entraining the liquid at the outlet of the hollow tube 11. This can increase the gas ejection speed and the liquid ejection volume, increase the air intake volume and air intake pressure of the gas-liquid mixing chamber, enhance the gas-liquid mixing effect, increase the overall mist output of the spray gun, and improve the atomization uniformity of the spray gun.

[0057] The working principle and usage method of this utility model are as follows:

[0058] Connect the gas phase connector 3 and the liquid phase connector 5 to the external gas source pipe and the liquid outlet pipe respectively, and open the valves of the external gas source pipe and the liquid outlet pipe.

[0059] Compressed air entering through the gas phase connector 3 enters the gas phase flow space between the outer tube 1 and the inner tube 16, enters the gas containment cavity through the first through hole 10 and the second through hole 13, and then is compressed and accelerated again through the annular gap formed by the outer wall of the hollow tube 11 and the inner wall of the baffle 14 before entering the gas-liquid mixing chamber of the nozzle 8.

[0060] The liquid entering through the liquid phase connector 5 flows through the filter screen 17 to remove impurities and then enters the inner tube 16. Guided and accelerated by the spiral groove 15, it enters the hollow tube 11 and then enters the gas-liquid mixing chamber of the nozzle 8.

[0061] Compressed air can generate negative pressure at the end of the hollow tube 11, thereby entraining the liquid at the outlet of the hollow tube 11 and increasing the liquid intake of the gas-liquid mixing chamber. The compressed air impacts and atomizes the liquid in the gas-liquid mixing chamber at high speed and sprays it out from the liquid outlet 9. The front end of the nozzle 8 is a cone surface, forming a wide-angle fan-shaped mist torch.

[0062] It is worth noting that the two cone angles of the inner wall of the annular baffle 14 can be adjusted to achieve different atomization particle sizes. According to the usage requirements, the dual-fluid nozzle spray gun supports the interchange of gas and liquid channels. That is, compressed gas is transported at high speed through the central channel of the inner tube 16, and liquid is transported through the annular gas phase flow space between the outer tube 1 and the inner tube 16, realizing the atomization structure of internal gas and external liquid. It is suitable for high viscosity liquids or working conditions that require a larger liquid output.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A novel high-efficiency anti-clogging dual-fluid nozzle spray gun, comprising an outer tube (1) and an inner tube (16) coaxially disposed inside the outer tube (1), characterized in that: The outer tube (1) is provided with a plug (4) at its rear end. The plug (4) has an axial mounting hole at its center. The rear end of the inner tube (16) extends into and is sealed and fixed in the axial mounting hole. A liquid phase connector (5) is installed in the axial mounting hole. The liquid phase connector (5) is connected to the rear end of the inner tube (16). An air inlet is provided on the rear section of the side surface of the outer tube (1), and a gas phase connector (3) is fixedly installed at the air inlet. A filter screen (17) is provided between the inner tube (16) and the liquid phase connector (5). A spiral guide groove (15) is provided on the inner wall of the inner tube (16) along the axial direction to guide and accelerate the flow rate of the liquid passing through. The front end of the outer tube (1) is fixedly connected to the mounting base (2), and the front end of the inner tube (16) extends into and is sealed and fixed in the mounting base (2). The mounting base (2) has a first through hole (10). The mounting base (2) is threaded with a spray assembly, and the connecting base (6) has a second through hole (13) that is connected to the first through hole (10). The spray assembly includes a connector (6), a nozzle (8), and an annular baffle (14). The connector (6) has a hollow tube (11) coaxial with the inner tube (16) at its center. The rear end of the hollow tube (11) is threaded into the mounting base (2). The front end of the hollow tube (11) extends into the nozzle (8). The nozzle (8) is fixed to the front end of the connector (6) by a locking nut (7). The annular baffle (14) is located inside the nozzle (8). Its edge stepped surface is clamped and fixed by the mating end face of the connector (6) and the nozzle (8). The front end of the nozzle (8) has a liquid outlet hole (9).

2. The novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 1, characterized in that: A gas phase flow space is formed between the outer tube (1) and the inner tube (16), and the gas phase connector (3) is connected to the first through hole (10) through the gas phase flow space.

3. The novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 1, characterized in that: An annular groove is provided between the mating end faces of the connecting seat (6) and the mounting seat (2), and a sealing gasket (12) is embedded inside the annular groove to prevent gas from leaking from the mating point of the first through hole (10) and the second through hole (13).

4. The novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 1, characterized in that: The first through hole (10) and the second through hole (13) are arranged in a ring array, with at least 4 of each. The number of the first through hole (10) and the second through hole (13) are equal and their positions correspond.

5. The novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 1, characterized in that: The front end of the hollow tube (11) extends into the interior of the annular baffle (14) and forms an annular flow gap with the inner wall of the annular baffle (14) to allow gas to pass through at high speed.

6. A novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 5, characterized in that: The inner wall of the annular baffle (14) is a two-section conical structure, consisting of a 65° cone angle section and a 30° cone angle section from back to front, which is used to compress the gas step by step and accelerate its ejection.

7. The novel high-efficiency anti-clogging dual-fluid nozzle spray gun according to claim 1, characterized in that: The hollow tube (11) is coaxially aligned with the inner tube (16), and the liquid in the inner tube (16) enters the gas-liquid mixing chamber inside the nozzle (8) directly through the hollow tube (11).

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