Self-cooled rotary high-temperature-resistant double-fluid spray gun

Abstract

The utility model relates to a self-cooling rotary high-temperature-resistant double-fluid spray gun, which aims to solve the technical problem that the existing spray gun is easy to deform at high temperature, and adopts the technical scheme that the left end of an inner pipe of the spray gun is plugged by a first plug, and two ends of a compressed air rotary joint are sleeved on the inner pipe of the spray gun through bearings; spray gun inner pipe air inlet holes are formed in the side wall, right opposite to the compressed air inlet connector, of the spray gun inner pipe, the spray gun outer pipe is fixedly arranged on the spray gun inner pipe, a liquid phase fluid cavity is formed between the spray gun inner pipe and the spray gun outer pipe, the liquid phase fluid rotating connector is arranged on the spray gun outer pipe through a bearing in a sleeving mode, and spray gun outer pipe liquid inlet holes are evenly formed in the side wall of the spray gun outer pipe. The cooling air pipe is sleeved on the liquid phase fluid rotating joint, and the wind wheel is arranged on the spray gun outer pipe and adopts an eccentric structure; the air distribution and plate jet integrator is arranged at the right end of the spray gun inner pipe, the cutter is arranged at the right end of the spray gun outer pipe, and the nozzle is arranged at the right end of the cutter. The cooling air inlet adopts an eccentric structure, and the driving wind wheel drives the spray gun to rotate integrally, so that the problem of bending deformation of the spray gun can be counteracted.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas purification and denitrification technology, specifically relating to a self-cooling rotary high-temperature resistant dual-fluid spray gun. Background Technology

[0002] Currently, the denitrification process in coal-fired power plants mainly adopts SCR and SNCR technologies. SNCR denitrification technology generally uses in-furnace direct injection technology, which directly injects a mixture of urea solution or liquid ammonia and compressed air into the boiler furnace to carry out an oxidation-reduction reaction with NOx in the flue gas to achieve the purpose of denitrification. The furnace temperature is generally 800-1300℃. Conventional spray guns usually cannot withstand such high temperatures. In order to ensure the long-term normal use of the spray gun, the position of the nozzle at the front end of the spray gun can usually only be arranged at the same level as the water-cooled wall with the support of cooling air. It is impossible to rise to a more effective position in the furnace to achieve a precise denitrification effect. Therefore, the development of a high-temperature resistant spray gun is imminent.

[0003] Common spray gun systems have the following problems:

[0004] 1. The materials for high-temperature resistant spray guns are relatively expensive, resulting in high equipment investment costs;

[0005] 2. Due to the common materials used, the spray gun has poor high-temperature resistance and is easily bent and deformed in a short period of time; Utility Model Content

[0006] The purpose of this invention is to solve the above problems and provide a self-cooling rotary high-temperature resistant dual-fluid spray gun.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A self-cooling rotary high-temperature resistant dual-fluid spray gun includes an inner tube, a compressed air rotary joint, an outer tube, a liquid phase fluid rotary joint, a cooling air duct, a fan, an air distribution and plate jet integrator, a cutter, and a nozzle. The left end of the inner tube is sealed with a first plug. The compressed air rotary joint is a tubular structure with a compressed air inlet in the middle. Both ends of the compressed air rotary joint are sleeved on the outer wall of the inner tube near the first plug by bearings, and the bearings are held in place by fastening bolts on the inner tube. Several air inlets are evenly opened on the side wall of the inner tube opposite to the compressed air inlet.

[0009] The outer tube of the spray gun is fixedly sleeved on the outer wall of the inner tube of the spray gun on the right side of the compressed air rotary joint, and the left end of the outer tube of the spray gun is sealed with the inner tube of the spray gun, forming a liquid fluid cavity between the two. The liquid fluid rotary joint is a tubular structure with a liquid fluid interface in the middle of the tube. Both ends of the liquid fluid rotary joint are sleeved on the outer wall of the left side of the outer tube of the spray gun through bearings, and the bearings are held in place by fastening bolts sleeved on the outer tube of the spray gun. Several liquid inlet holes of the outer tube of the spray gun are evenly opened on the side wall of the outer tube of the spray gun opposite to the liquid fluid interface.

[0010] The right end of the liquid phase fluid rotary joint is provided with a raised step, the cooling air duct is fixedly sleeved on the raised step of the liquid phase fluid rotary joint, the middle of the cooling air duct is provided with a cooling air inlet, the impeller is fixedly sleeved on the outer tube of the spray gun directly opposite the cooling air inlet, and the cooling air inlet and the impeller adopt an eccentric structure.

[0011] The air distribution and plate jet integrator is fixed to the right port of the inner tube of the spray gun, and the left port of the inner cavity of the air distribution and plate jet integrator is sealed with a second plug. The cutter is fixed to the right port of the outer tube of the spray gun, and the nozzle is located at the right end of the cutter.

[0012] Furthermore, the air distribution and plate jet integrator has a stepped structure, including a first step, a second step, and a third step. The first step and the second step are evenly provided with a number of air distribution holes along the axial direction, and the second step is evenly provided with a number of connecting holes along the radial direction. The third step has a jet hole inside, which is connected to the inner cavity of the first step and the second step. The first step is inserted into the inner tube of the spray gun, and the connecting hole is connected to the liquid phase fluid cavity.

[0013] Furthermore, the nozzle has an inner cavity in the middle, a mixing column is provided in the middle of the right end face of the inner cavity, and several outwardly diverging spray holes are evenly opened on the right end face of the nozzle around the mixing column.

[0014] Furthermore, the third step of the air distribution and plate jet integration unit extends into the inner cavity of the cutter. The left side of the air distribution hole is connected to the gas phase fluid cavity, and the right side is connected to the inner cavity of the cutter. The inner cavity of the cutter is connected to the inner cavity of the nozzle.

[0015] Furthermore, the nozzle is fixed to the right end of the outer tube of the spray gun by a nozzle fastener.

[0016] Furthermore, sealing rings are provided at the connection between the compressed air rotary joint and the inner tube of the spray gun, and at the connection between the liquid fluid rotary joint and the outer tube of the spray gun.

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

[0018] 1. This utility model installs a fan wheel on the outer tube of the spray gun and adopts an eccentric structure design for the cooling air inlet. When the cooling air is circulated, the gas entering the cooling air duct blows directly onto the fan wheel installed on the outer tube of the spray gun. The fan wheel drives the entire spray gun to rotate. When the spray gun rotates on its own, it can counteract the problem of the spray gun bending deformation caused by high temperature, flow field thrust and the spray gun's own weight.

[0019] 2. The gas and liquid phase inlet connectors of the spray gun of this utility model are rotated by bearings, which can ensure that the spray gun can normally feed liquid and gas when rotating.

[0020] 3. In this invention, the liquid phase of the spray gun enters through the outer tube, and the gas phase enters through the inner tube. After the two-phase fluids reach the nozzle, they are switched between the inner and outer channels at the air distributor and the jet integrator. While ensuring the atomization effect of the spray gun, the liquid phase in the outer tube can partially cool the spray gun, which can reduce its deformation caused by high temperature to a certain extent. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the present invention;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of a portion of region A in the middle;

[0024] Figure 4 This is a schematic diagram of the cooling duct structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the wind turbine structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the air distribution and plate jet integrator of this utility model;

[0027] Figure 7 This is a schematic diagram of the air distribution and plate jet integrator of this utility model from another perspective.

[0028] Figure 8 This is a schematic diagram of the nozzle structure of this utility model;

[0029] In the diagram: 1. First blockage; 2. Inner tube of spray gun; 3. Fastening bolt; 4. Bearing; 5. Sealing ring; 6. Compressed air rotary joint; 7. Outer tube of spray gun; 8. Liquid phase fluid rotary joint; 9. Cooling air duct; 10. Fan wheel; 11. Air inlet of inner tube of spray gun; 12. Liquid inlet of outer tube of spray gun; 13. Second blockage; 14. Air distribution and plate jet integrator; 15. Connecting hole; 16. Cutter; 17. Nozzle fastener; 18. Nozzle; 19. Spray hole; 20. Air distribution hole; 21. Jet hole; 22. Mixing column; 23. Gas phase fluid cavity; 24. Liquid phase fluid cavity; 25. First step; 26. Second step; 27. Third step. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1-8 As shown, a self-cooling rotary high-temperature resistant dual-fluid spray gun includes an inner tube 2, a compressed air rotary joint 6, an outer tube 7, a liquid phase fluid rotary joint 8, a cooling air duct 9, a fan wheel 10, an air distribution and plate jet integrator 14, a cutter 16, and a nozzle 18. The left end of the inner tube 2 is sealed with a first plug 1. The compressed air rotary joint 6 is a tubular structure with a compressed air inlet in the middle. Both ends of the compressed air rotary joint 6 are sleeved on the outer wall of the inner tube 2 near the first plug 1 by bearings 4. The bearings 4 are held in place by fastening bolts 3 on the inner tube 2 to limit their movement and prevent the compressed air rotary joint 6 from moving left and right. A sealing ring 5 is provided at the connection between the compressed air rotary joint 6 and the inner tube 2 to prevent gas from escaping. Several air inlets 11 are evenly opened on the side wall of the inner tube 2 opposite to the compressed air inlet.

[0032] The outer tube 7 of the spray gun is fixedly sleeved on the outer wall of the inner tube 2 of the spray gun on the right side of the compressed air rotary joint 6, and the left end of the outer tube 7 of the spray gun is sealed with the inner tube 2 of the spray gun, forming a liquid phase fluid cavity 24 between the two. The liquid phase fluid rotary joint 8 is a tubular structure with a liquid phase fluid interface in the middle of the tube. Both ends of the liquid phase fluid rotary joint 8 are sleeved on the outer wall of the left side of the outer tube 7 through bearings 4, and the bearings 4 are held in place by fastening bolts 3 sleeved on the outer tube 7 of the spray gun, limiting the bearings 4 and preventing the liquid phase fluid rotary joint 8 from moving left and right. The connection between the liquid phase fluid rotary joint 8 and the outer tube 7 of the spray gun is provided with sealing rings 5 ​​to prevent liquid phase from flowing out. Several spray gun outer tube liquid inlet holes 12 are evenly opened on the side wall of the outer tube 7 opposite to the liquid phase fluid interface.

[0033] The right end of the liquid phase fluid rotary joint 8 is provided with a raised step, the cooling air duct 9 is fixedly sleeved on the raised step of the liquid phase fluid rotary joint 8, the cooling air duct 9 is provided with a cooling air inlet in the middle, the impeller 10 is fixedly sleeved on the spray gun outer tube 7 directly opposite the cooling air inlet, and the cooling air inlet and the impeller 10 adopt an eccentric structure.

[0034] The air distribution and plate jet integrator 14 has a stepped structure, including a first step 25, a second step 26, and a third step 27. The first step 25 and the second step 26 have a plurality of air distribution holes 20 evenly distributed along the axial direction. The second step 26 has a plurality of connecting holes 15 evenly distributed along the radial direction. The third step 27 has a jet hole 21 inside, which communicates with the inner cavities of the first step 25 and the second step 26. The first step 25 is inserted into the inner tube 2 of the spray gun. The connecting holes 15 communicate with the liquid phase fluid cavity 24. The left port of the inner cavity of the plate jet integrator 14 is sealed with a second plug 13. The cutter 16 is fixed to the right end of the spray gun outer tube 7. The nozzle 18 is located at the right end of the cutter 16. The nozzle 18 has an inner cavity in the middle. A mixing column 22 is located in the middle of the right end face of the inner cavity. Several outwardly diverging spray holes 19 are evenly opened on the right end face of the nozzle 18 around the mixing column 22. The third step 27 of the air distribution and plate jet integrator 14 extends into the inner cavity of the cutter 16. The left side of the air distribution hole 20 is connected to the gas phase fluid cavity 23, and the right side is connected to the inner cavity of the cutter 16. The inner cavity of the cutter 16 is connected to the inner cavity of the nozzle 18. The nozzle 18 is fixed to the right end of the spray gun outer tube 7 by the nozzle fastener 17.

[0035] The operation process of this utility model:

[0036] When the spray gun is working, compressed air enters through the compressed air inlet of the compressed air rotary joint 6, enters the gas phase fluid chamber 23 through the air inlet 11 of the inner tube of the spray gun, and moves to the right. Liquid phase fluid enters through the liquid phase fluid inlet of the liquid phase rotary joint 8, enters the liquid phase fluid chamber 24 through the liquid inlet 12 of the outer tube of the spray gun, and moves to the right. During the movement of the liquid phase fluid to the right, it cools the outer tube 7 of the spray gun and reaches the right end of the liquid phase fluid chamber 24. Then, the liquid phase flows into the air distribution chamber from all sides through the connecting hole 15. The liquid phase fluid is injected into the inner cavity of the plate jet integrator 14 and then into the inner cavity of the cutter 16 through the jet hole 21. At the same time, the gas phase fluid in the gas phase fluid cavity 23 is injected into the inner cavity of the cutter 16 at high speed after passing through the air distribution holes 20 around the plate jet integrator 14. The liquid phase fluid ejected from the jet hole 21 is cut and the gas-liquid mixture is atomized. The atomized gas-liquid mixture enters the inner cavity of the nozzle 18 and is further atomized after impacting the mixing column 22. It is then ejected through the nozzle 19.

[0037] At the same time, cooling air enters from the eccentric air inlet of cooling air duct 9 and blows directly onto the impeller 10, driving the impeller 10 to rotate. The impeller 10 further drives the entire spray gun to rotate. When the spray gun rotates, it can counteract the bending deformation caused by its own weight and the impact force of the flow field after softening at high temperature. After passing through the impeller 10, the cooling air flows through the cooling air duct to cool the spray gun before entering the furnace.

Claims

1. A self-cooling rotary high-temperature resistant dual-fluid spray gun, characterized in that, The spray gun includes an inner tube (2), a compressed air rotary joint (6), an outer tube (7), a liquid fluid rotary joint (8), a cooling air duct (9), a fan wheel (10), an air distribution and plate jet integrator (14), a cutter (16), and a nozzle (18). The left end of the inner tube (2) is sealed with a first plug (1). The compressed air rotary joint (6) is a tubular structure with a compressed air inlet in the middle. Both ends of the compressed air rotary joint (6) are fitted onto the outer wall of the inner tube (2) near the first plug (1) by bearings (4). The bearings (4) are held in place by fastening bolts (3) fitted onto the inner tube (2). A sealing ring (5) is provided at the connection between the compressed air rotary joint (6) and the inner tube (2). Several air inlets (11) are evenly opened on the side wall of the inner tube (2) opposite to the compressed air inlet. The outer tube (7) of the spray gun is fixedly sleeved on the outer wall of the inner tube (2) of the spray gun on the right side of the compressed air rotary joint (6), and the left end of the outer tube (7) of the spray gun is sealed with the inner tube (2) of the spray gun, forming a liquid fluid cavity (24) between the two. The liquid fluid rotary joint (8) is a tubular structure with a liquid fluid interface in the middle of the tube. Both ends of the liquid fluid rotary joint (8) are sleeved on the outer wall of the left side of the outer tube (7) of the spray gun through bearings (4), and the bearings (4) are held in place by fastening bolts (3) sleeved on the outer tube (7) of the spray gun. A sealing ring (5) is provided at the connection between the liquid fluid rotary joint (8) and the outer tube (7) of the spray gun. Several liquid inlet holes (12) of the outer tube of the spray gun are evenly opened on the side wall of the outer tube (7) of the spray gun directly opposite the liquid fluid interface. The right end of the liquid phase fluid rotary joint (8) is provided with a raised step. The cooling air duct (9) is fixedly sleeved on the raised step of the liquid phase fluid rotary joint (8). The cooling air duct (9) is provided with a cooling air inlet in the middle. The impeller (10) is fixedly sleeved on the spray gun outer tube (7) directly opposite the cooling air inlet. The cooling air inlet and the impeller (10) adopt an eccentric structure. The air distribution and plate jet integrator (14) is fixed at the right port of the inner tube (2) of the spray gun, and the left port of the inner cavity of the air distribution and plate jet integrator (14) is sealed with a second plug (13). The cutter (16) is fixed at the right port of the outer tube (7) of the spray gun, and the nozzle (18) is located at the right end of the cutter (16). The nozzle (18) is fixed to the right end of the outer tube (7) of the spray gun by the nozzle fastener (17).

2. The self-cooling rotary high-temperature resistant dual-fluid spray gun according to claim 1, characterized in that, The air distribution and plate jet integrator (14) has a stepped structure, including a first step (25), a second step (26) and a third step (27). The first step (25) and the second step (26) are evenly provided with a number of air distribution holes (20) along the axial direction. The second step (26) is evenly provided with a number of connecting holes (15) along the radial direction. The third step (27) has a jet hole (21) inside. The jet hole (21) is connected to the inner cavity of the first step (25) and the second step (26). The first step (25) is inserted into the inner tube (2) of the spray gun. The connecting hole (15) is connected to the liquid phase fluid cavity (24).

3. The self-cooling rotary high-temperature resistant dual-fluid spray gun according to claim 2, characterized in that, The nozzle (18) has an inner cavity in the middle, and a mixing column (22) is provided in the middle of the right end face of the inner cavity. Several outwardly diverging nozzle holes (19) are evenly opened on the right end face of the nozzle (18) around the mixing column (22).

4. The self-cooling rotary high-temperature resistant dual-fluid spray gun according to claim 3, characterized in that, The third step (27) of the air distribution and plate jet integrator (14) extends into the inner cavity of the cutter (16). The left side of the air distribution hole (20) is connected to the gas phase fluid cavity (23), and the right side is connected to the inner cavity of the cutter (16). The inner cavity of the cutter (16) is connected to the inner cavity of the nozzle (18).

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