Straight-through gas-liquid separation end shearing nozzle spray gun

Abstract

The utility model relates to flue gas denitration equipment field especially, more particularly to a straight -through formula gas -liquid separation end shearing nozzle spray gun, including the outer tube and the inner tube of coaxial setting in the outer tube, the outer tube inner wall and the outer wall of inner tube form gas phase cavity through radial gap, the right -hand end fixedly connected with the plug of outer tube, the axial center hole of plug fixedly connected with liquid phase connector, the right -hand end of inner tube is inserted and fixed in the axial center hole of plug, the gas inlet of outer tube outside surface right -hand end fixedly connected with gas phase connector, the left end of outer tube is equipped with the mounting seat, and the middle part of mounting seat is equipped with the through -flow hole that communicates with the left end of inner tube, the utility model discloses a straight -through formula coaxial double -tube design, liquid phase goes to the center inner tube, and gas phase goes to the annular gas phase cavity between outer tube and inner tube, realizes gas -liquid separation conveying all the way, only carries out high -pressure shearing atomization in nozzle end, effectively avoids the reduction agent in the gun body in advance crystallization blockage, improves the reliability and service life of spray gun in high temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification equipment, and in particular to a straight-through gas-liquid separation end shear nozzle spray gun. Background Technology

[0002] The current mainstream denitrification processes mainly include two methods: SNCR denitrification and SCR denitrification.

[0003] 1. SNCR denitrification technology

[0004] SNCR technology involves injecting nitrogen-containing reducing agents such as ammonia or urea into the high-temperature zone of the furnace, causing them to react with NOx within a temperature window of 850℃ to 1100℃, producing N2 and H2O. This technology offers advantages such as low investment and convenient construction, but it also suffers from problems such as low reducing agent utilization, uneven spray distribution, localized overspray leading to high ammonia escape, and premature mixing of the gas and liquid phases inside the nozzle, making it prone to crystallization and blockage in the high-temperature zone.

[0005] 2. SCR denitrification technology

[0006] CR technology, under the action of a catalyst, completes the denitrification reaction in a temperature range of 300℃ to 420℃, with a denitrification efficiency exceeding 90%, making it the mainstream process for ultra-low emissions. However, it has extremely high requirements for the uniformity of atomization of the spray gun, the accuracy of flow control, and the uniformity of ammonia nitrogen distribution. Uneven spraying can easily cause catalyst poisoning, blockage, or ammonia escape.

[0007] Therefore, it is necessary to further improve the nozzles and spray guns used for flue gas denitrification. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the existing defects and provide a straight-through gas-liquid separation end shear nozzle spray gun. It adopts a straight-through coaxial double tube design to realize the separation and transportation of gas and liquid throughout the process. High-pressure shearing atomization is only performed at the end of the nozzle, which effectively avoids the reducing agent from crystallizing and clogging the gun body in advance, improves the reliability and service life of the spray gun in high-temperature environments, and can effectively solve the problems in the background technology.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a straight-through gas-liquid separation end shear nozzle spray gun, comprising an outer tube and an inner tube coaxially disposed within the outer tube, the inner wall of the outer tube and the outer wall of the inner tube forming a gas phase cavity through a radial gap, a plug being fixedly connected to the right end of the outer tube, a liquid phase connector being fixedly connected to the axial center hole of the plug, the right end of the inner tube extending into and fixed within the axial center hole of the plug, and a gas phase connector being fixedly connected to the air inlet at the right end of the outer side of the outer tube;

[0010] The left end of the outer tube is provided with a mounting seat, and the middle of the mounting seat is provided with a flow hole that communicates with the left end of the inner tube. The left side of the mounting seat is provided with a second through hole arranged in a circumferential array. The left end of the inner tube is connected to the right end of the mounting seat, and the flow hole of the mounting seat is internally threaded with an atomizing component.

[0011] The atomizing assembly includes a nozzle, a locking nut, and a connecting seat. The left and right sides of the connecting seat are integrally extended with a coaxially arranged spray tube and a hollow tube, respectively. The hollow tube is threaded into the flow hole of the mounting seat. A first through hole is opened on the right side of the connecting seat. The nozzle is installed on the connecting seat by the locking nut. The outer end of the nozzle is provided with atomizing holes arranged in a circumferential array. The axis of each atomizing hole forms an angle of 10° to 45° with the axis of the nozzle. The spray tube extends into the inner cavity of the nozzle and ends 5mm to 10mm before the inlet of the atomizing hole.

[0012] Preferably, the second through holes are evenly distributed in an array along the circumference of the mounting base, and the number of them is 6-12. The gas phase cavity is connected to the atomizing component through the second through holes, so that the gas in the gas phase cavity can pass through the second through holes evenly and symmetrically.

[0013] Preferably, the right side of the connector has a first through hole corresponding to each of the second through holes. The first through hole communicates with the second through hole and with the nozzle cavity, so that compressed air enters the nozzle cavity evenly, forming an annular air curtain to envelop the liquid and mix the gas and liquid.

[0014] Preferably, the spray pipe and the hollow pipe are integrally formed with the connecting seat, and its inner cavity is a tapered flow cavity with a ratio of 2:1 to 3:1 between the inner diameter of the inlet section and the inner diameter of the outlet section. The inner pipe, the flow hole of the mounting seat, and the flow cavity are connected in sequence to realize the accelerated entry of the liquid phase into the inner cavity of the nozzle.

[0015] Preferably, the outer wall of the right end and the inner wall of the left end of the inner tube are respectively provided with annular sealing grooves, and O-rings are embedded in the annular sealing grooves, which are pressed and sealed with the inner wall of the center hole of the plug and the outer wall of the right end of the mounting base, respectively.

[0016] Preferably, the outer end face of the nozzle is spherical, and the axis of the atomizing hole forms an angle of 15° to 30° with the axis of the nozzle.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention adopts a straight-through coaxial double-tube design, with the liquid phase flowing through the central inner tube and the gas phase flowing through the annular gas phase cavity between the outer and inner tubes, achieving full separation and delivery of gas and liquid. High-pressure shearing atomization is only performed at the nozzle tip, effectively preventing the reducing agent from prematurely crystallizing and clogging the gun body, and improving the reliability and service life of the spray gun in high-temperature environments.

[0019] This utility model uses a gradually narrowing conical flow cavity for the liquid circuit. The liquid phase is accelerated to form a stable high-speed liquid column, and the gas phase enters the nozzle through the second through hole and the first through hole to form a symmetrical annular gas curtain. The gas and liquid achieve enveloping strong shearing and collision atomization in the nozzle, resulting in finer and more uniform atomization. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the atomizing component structure of this utility model;

[0022] Figure 3 This is a cross-sectional schematic diagram of the atomizing component of this utility model;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the right end of the outer tube of this utility model;

[0024] Figure 5 This is a schematic diagram of the explosion of the atomizing component of this utility model. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the explosion of the atomizing component of this utility model. Figure 2 .

[0026] Explanation of reference numerals in the attached drawings: 1. Outer tube; 2. Mounting base; 3. Nozzle; 4. Atomizing orifice; 5. Locking nut; 6. Connecting seat; 7. Plug; 8. Liquid phase connector; 9. Gas phase connector; 10. First through hole; 11. Second through hole; 12. Flow chamber; 13. Gas phase chamber; 14. Inner tube; 15. Hollow tube; 16. Spray tube; Detailed Implementation

[0027] 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.

[0028] 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 1The 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.

[0029] Please see Figure 1-6 The present invention provides the following technical solution:

[0030] A straight-through gas-liquid separation end-shear nozzle spray gun adopts a straight-through coaxial nested structure. The liquid phase passes through the center of the inner tube 14 and directly reaches the spray pipe 16, while the gas phase travels along the annular gas phase cavity 13 between the outer tube 1 and the inner tube 14, realizing gas-liquid separation and delivery, and end-pressure shear atomization, avoiding the defects of traditional parallel spray guns that are prone to clogging and uneven atomization.

[0031] like Figure 1 and Figure 4 As shown, the outer tube 1 is a cylindrical hollow tube, preferably made of 304 stainless steel. The inner tube 14 is coaxially fitted inside the outer tube 1, preferably made of 316L stainless steel. A radial gap is maintained between the two to form an annular gas phase cavity 13. The gas phase cavity 13 can ensure sufficient gas flow and low flow resistance. Compressed air forms a laminar flow ring along the gas phase cavity 13 to avoid pressure pulsation caused by turbulence.

[0032] The right end of the outer tube 1 is threaded with a plug 7, which has an axial center hole. The right end of the inner tube 14 extends into the axial center hole and is sealed and fixed by a double O-ring. The liquid phase connector 8 is screwed into the axial center hole of the plug 7, and a fluororubber O-ring is provided on the mating surface to ensure zero leakage of liquid phase transmission. An air inlet is opened on the outer wall of the right end of the outer tube 1, and the gas phase connector 9 is welded and fixed at the air inlet of the outer tube 1.

[0033] The left end of the outer tube 1 is welded to the right end of the mounting base 2. The left end of the inner tube 14 is pressed and fitted onto the mounting base 2 by an O-ring. A flow hole is opened in the middle of the mounting base 2, which is connected to the inner tube 14. Eight second through holes 11 are evenly arrayed along the left side. The second through holes 11 are connected to the gas phase chamber 13. The high-pressure gas in the gas phase chamber 13 forms an annular gas curtain through the eight symmetrical through holes. The airflow speed is uniform, avoiding flow deviation and improving the atomization effect.

[0034] like Figure 3As shown, the atomizing component is screwed into the flow hole of the mounting base 2 through the external thread of the hollow tube 15 of the connecting base 6. The connecting base 6, the spray tube 16, and the hollow tube 15 are integrally machined. The inner cavity is a tapered flow cavity 12 with an inlet section inner diameter of Φ10mm and an outlet section inner diameter of Φ4mm and a taper ratio of 2.5:1. A first through hole 10 is provided on the right side of the connecting base 6. The first through hole 10 and the second through hole 11 are correspondingly provided. The liquid phase enters the inner cavity of the nozzle 3 through the inner tube 14, the flow hole, and the flow cavity 12. The tapering of the flow channel increases the liquid flow rate and forms a stable liquid column, which facilitates subsequent gas-liquid shearing. The gas phase enters the inner cavity of the nozzle 3 through the gas phase cavity 13, the second through hole 11, and the first through hole 10, and performs enveloping shearing on the liquid. The gas and liquid collide and atomize.

[0035] The spray pipe 16 extends into the inner cavity of the nozzle 3 and stops 6 mm before the inlet of the atomizing hole 4. This distance ensures that the liquid column is fully exposed to the high-pressure air curtain shear zone. The high-speed airflow enters the inner cavity of the nozzle 3 along the gap between the spray pipe 16 and the nozzle 3. The shear angle with the central liquid column forms a ring-shaped gas-liquid collision zone. The droplets are subjected to the dual effects of aerodynamic breakup and turbulent diffusion, which makes the liquid fully atomized and sprayed out from the atomizing hole 4. The nozzle 3 can be made of hard alloy YC8 with a spherical crown-shaped outer end face. Eight atomizing holes 4 are arranged in a circumferential array, and the axis of each hole is at a 22° angle with the axis of the nozzle.

[0036] The locking nut 5 is made of 304 stainless steel and is threaded to the connecting seat 6. It can fix the nozzle 3 on the connecting seat 6, ensuring the coaxiality of the nozzle 3 and the connecting seat 6, preventing vibration and loosening, and stabilizing the atomization angle.

[0037] The working principle and usage method of this utility model are as follows:

[0038] Connect the liquid phase connector 8 to the outlet pipe of the external liquid pump, and connect the gas phase connector 9 to the outlet pipe of the air compressor.

[0039] Open the valves on the external gas and liquid pipelines. The liquid enters the flow chamber 12 through the liquid phase connector 8, along the flow hole of the inner tube 14 and the mounting base 2. As the flow channel of the flow chamber 12 gradually narrows, the liquid flow rate increases and the liquid enters the inner cavity of the nozzle 3.

[0040] Compressed air enters the gas phase chamber 13 through the gas phase connector 9, and enters the inner cavity of the nozzle 3 through the second through hole 11 and the first through hole 10. The compressed air forms an annular air curtain through the gap between the liquid spray pipe 16 and the nozzle 3. The compressed air and liquid collide and vaporize in the inner cavity of the nozzle 3, and are sprayed out through the atomizing hole 4.

[0041] It is worth noting that the number of atomizing holes 4 can be adjusted to 6 to 12 according to the flow rate requirements. Effective atomization can be achieved in the range of 10° to 45°. It is optimal to have 8 holes in both the first through hole 10 and the second through hole 11.

[0042] 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 straight-through gas-liquid separation end-shear nozzle spray gun, comprising an outer tube (1) and an inner tube (14) coaxially disposed within the outer tube (1), wherein the inner wall of the outer tube (1) and the outer wall of the inner tube (14) form a gas phase cavity (13) through a radial gap, characterized in that: The right end of the outer tube (1) is fixedly connected to a plug (7), and a liquid phase connector (8) is fixedly connected in the axial center hole of the plug (7). The right end of the inner tube (14) extends into and is fixed in the axial center hole of the plug (7). A gas phase connector (9) is fixedly connected at the air inlet on the right side of the outer tube (1). The outer tube (1) is provided with a mounting seat (2) at its left end. The middle part of the mounting seat (2) is provided with a flow hole that communicates with the left end of the inner tube (14). The left side of the mounting seat (2) is provided with a second through hole (11) arranged in a circumferential array. The left end of the inner tube (14) is connected to the right end of the mounting seat (2). The flow hole of the mounting seat (2) is internally threaded with an atomizing component. The atomizing assembly includes a nozzle (3), a locking nut (5), and a connecting seat (6). The left and right sides of the connecting seat (6) are integrally extended with a coaxially arranged spray pipe (16) and a hollow tube (15). The hollow tube (15) is threaded into the flow hole of the mounting seat (2). The right side of the connecting seat (6) is provided with a first through hole (10). The nozzle (3) is installed on the connecting seat (6) by the locking nut (5). The outer end of the nozzle (3) is provided with atomizing holes (4) arranged in a circumferential array. The axis of each atomizing hole (4) is at an angle of 10° to 45° with the axis of the nozzle (3). The spray pipe (16) extends into the inner cavity of the nozzle (3) and stops 5mm to 10mm in front of the inlet of the atomizing hole (4).

2. The straight-through gas-liquid separation end shear nozzle spray gun according to claim 1, characterized in that: The second through hole (11) is evenly distributed in an array along the circumference of the mounting base (2), and the number of openings is 6-12. The gas phase cavity (13) is connected to the atomizing component through the second through hole (11) so that the gas in the gas phase cavity (13) passes through the second through hole (11) evenly and symmetrically.

3. The straight-through gas-liquid separation end shear nozzle spray gun according to claim 2, characterized in that: The right side of the connecting seat (6) has a first through hole (10) corresponding to each second through hole (11). The first through hole (10) is connected to the second through hole (11) and the first through hole (10) is connected to the inner cavity of the nozzle (3), so that compressed air enters the inner cavity of the nozzle (3) evenly, forming an annular air curtain to wrap the liquid and mix the gas and liquid.

4. The straight-through gas-liquid separation end shear nozzle spray gun according to claim 1, characterized in that: The spray pipe (16) and hollow pipe (15) are integrally formed with the connecting seat (6). The inner cavity is a tapered flow cavity (12). The ratio of the inner diameter of the inlet section to the inner diameter of the outlet section is 2:1 to 3:

1. The inner pipe (14), the flow hole of the mounting seat (2), and the flow cavity (12) are connected in sequence to realize the accelerated entry of the liquid phase into the inner cavity of the nozzle (3).

5. A straight-through gas-liquid separation end-shear nozzle spray gun according to claim 1, characterized in that: The outer wall of the right end and the inner wall of the left end of the inner tube (14) are respectively provided with annular sealing grooves. The annular sealing grooves are fitted with O-rings, which are pressed and sealed against the inner wall of the center hole of the plug (7) and the outer wall of the right end of the mounting base (2).

6. The straight-through gas-liquid separation end shear nozzle spray gun according to claim 1, characterized in that: The outer end face of the nozzle (3) is spherical, and the axis of the atomizing hole (4) forms an angle of 15° to 30° with the axis of the nozzle (3).

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