Self-cooling rotary high-temperature-resistant double-fluid spray gun system

Abstract

The invention relates to a self-cooling rotary high-temperature-resistant double-fluid spray gun, and aims to solve the technical problem that an existing spray gun is easy to deform at high temperature. According to the technical scheme, the left end of an inner pipe of the spray gun is plugged by a first plug, and the two ends of a compressed air rotary joint are arranged on the inner pipe of the spray gun through bearings in a sleeving manner; 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 is of an eccentric structure, the driving wind wheel drives the spray gun to rotate integrally, and the bending deformation problem of the spray gun can be counteracted.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas purification and denitration, and in particular relates to a self-cooling rotary high-temperature resistant double-fluid spray gun. Background Art

[0002] At present, the denitrification process of coal-fired power plants mainly adopts SCR and SNCR technologies. The SNCR denitrification technology generally adopts the direct injection technology in the furnace, and the urea solution or the mixture of liquid ammonia and compressed air is directly sprayed into the boiler furnace to react with the NOx in the flue gas for oxidation-reduction reaction to achieve the purpose of denitrification. The temperature in the furnace is generally 800-1300℃. Conventional spray guns are usually unable to withstand such high temperatures. In order to ensure the long-term normal use of the spray gun, the front nozzle position of the spray gun can usually only be arranged at the same position as the water-cooled wall under the support of cooling air, and it cannot be raised to a more effective position in the furnace to achieve a refined denitrification effect. Therefore, it is urgent to develop a high-temperature resistant spray gun.

[0003] Common spray gun system problems include: 1. The price of high temperature resistant spray gun materials is relatively expensive, and the equipment investment cost is high; 2. The spray gun made of common materials has poor high temperature resistance and is very easy to bend and deform in a short time; Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a self-cooling rotary high temperature resistant double fluid spray gun.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A self-cooling rotary high-temperature resistant dual-fluid spray gun, comprising a spray gun inner tube, a compressed air rotary joint, a spray gun outer tube, a liquid phase fluid rotary joint, a cooling air duct, a wind wheel, an air distribution and plate jet integrator, a cutter and a spray head, the left end port of the spray gun inner tube is blocked by a first plug, the compressed air rotary joint is a tubular structure, a compressed air inlet interface is provided in the middle of the tube, both ends of the compressed air rotary joint are sleeved on the outer side wall of the spray gun inner tube close to the first plug through bearings, and the bearings are supported by fastening bolts sleeved on the spray gun inner tube, a sealing ring is provided at the connection between the compressed air rotary joint and the spray gun inner tube, and a plurality of spray gun inner tube air inlet holes are evenly opened on the side wall of the spray gun inner tube facing the compressed air inlet interface; The spray gun outer tube is fixedly sleeved on the outer side wall of the spray gun inner tube on the right side of the compressed air rotary joint, and the left end of the spray gun outer tube is sealed with the spray gun inner tube to form a liquid phase fluid cavity between the two. The liquid phase fluid rotary joint is a tubular structure, and a liquid phase fluid interface is provided in the middle of the tube. Both ends of the liquid phase fluid rotary joint are sleeved on the outer side wall of the left side of the spray gun outer tube through bearings, and the bearings are supported by fastening bolts sleeved on the spray gun outer tube. Sealing rings are provided at the connection between the liquid phase fluid rotary joint and the spray gun outer tube, and a plurality of spray gun outer tube liquid inlet holes are evenly opened on the side wall of the spray gun outer tube opposite to the liquid phase fluid interface. A raised step is provided at the right end of the liquid phase fluid rotary joint, the cooling air duct fixed sleeve is arranged on the raised step of the liquid phase fluid rotary joint, a cooling air inlet is arranged in the middle of the cooling air duct, the wind wheel fixed sleeve is arranged on the outer tube of the spray gun facing the cooling air inlet, and the cooling air inlet and the wind wheel adopt an eccentric structure; The air distribution and plate jet integrator is fixed at 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 blocked by a second plugging device. The cutter is fixed at the right port of the outer tube of the spray gun, and the nozzle is arranged at the right end of the cutter. The nozzle is fixed to the right end of the outer tube of the spray gun through a nozzle fastener.

[0006] Furthermore, the air distribution and plate jet integrator is a stepped structure, including a first step, a second step and a third step. A number of air distribution holes are evenly opened on the first step and the second step along the axial direction, and a number of connecting holes are evenly opened on the second step along the radial direction. The interior of the third step is a jet hole, and the jet hole is connected with 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 with the liquid fluid cavity.

[0007] Furthermore, an inner cavity is provided in the middle of the nozzle, a mixing column is provided in the middle of the right end surface of the inner cavity, and a plurality of spray holes diverging outwards are evenly provided on the right end surface of the nozzle around the mixing column.

[0008] Furthermore, the third step of the air distribution and plate jet integrator 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, and the inner cavity of the cutter is connected to the inner cavity of the nozzle.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention installs a wind wheel on the outer tube of the spray gun, and the cooling air inlet adopts an eccentric structure design. When the cooling air is ventilated, the gas entering the cooling air duct directly blows the wind wheel installed on the outer tube of the spray gun, and the wind wheel drives the spray gun to rotate as a whole. When the spray gun rotates itself, it can offset the bending deformation problem of the spray gun caused by high temperature, flow field thrust and the spray gun's own gravity; 2. The gas phase and liquid phase inlet joints of the spray gun of the present invention are both rotated by bearings, which can ensure that the spray gun can normally inlet liquid and gas when rotating; 3. The liquid phase of the spray gun of the present invention enters from the outer tube, and the gas phase enters from the inner tube. After the two-phase fluid reaches the nozzle, the inner and outer channels are converted at the air distributor and the jet integrator. While ensuring the atomization effect of the spray gun, the liquid phase of the outer tube can partially cool the spray gun, which can reduce its deformation caused by high temperature to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the local enlarged structure of the middle A area; Figure 4 It is a schematic diagram of the cooling air duct structure of the present invention; Figure 5 It is a schematic diagram of the wind wheel structure of the present invention; Figure 6 It is a schematic diagram of the structure of the air distribution and plate jet integrator of the present invention; Figure 7 It is a structural schematic diagram of the wind distribution and plate jet integrator of the present invention from another perspective; Figure 8 It is a schematic diagram of the nozzle structure of the present invention; In the figure: 1, first blockage; 2, spray gun inner tube; 3, fastening bolt; 4, bearing; 5, sealing ring; 6, compressed air rotary joint; 7, spray gun outer tube; 8, liquid phase fluid rotary joint; 9, cooling air duct; 10, wind wheel; 11, spray gun inner tube air inlet hole; 12, spray gun outer tube liquid inlet hole; 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 DESCRIPTION

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] like Figure 1-8As shown, a self-cooling rotary high-temperature resistant dual-fluid spray gun includes a spray gun inner tube 2, a compressed air rotary joint 6, a spray gun outer tube 7, a liquid phase fluid rotary joint 8, a cooling air duct 9, a wind wheel 10, an air distribution and plate jet integrator 14, a cutter 16 and a nozzle 18. The left end port of the spray gun inner tube 2 is blocked by a first plug 1. The compressed air rotary joint 6 is a tubular structure, and a compressed air inlet interface is provided in the middle of the tube. Both ends of the compressed air rotary joint 6 are sleeved on the outer side wall of the spray gun inner tube 2 close to the first plug 1 through bearings 4, and the bearing 4 is supported by a fastening bolt 3 sleeved on the spray gun inner tube 2 to limit the bearing 4 to 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 spray gun inner tube 2 to prevent gas escape. A plurality of spray gun inner tube air inlet holes 11 are evenly opened on the side wall of the spray gun inner tube 2 facing the compressed air inlet interface. The spray gun outer tube 7 is fixedly sleeved on the outer side wall of the spray gun inner tube 2 on the right side of the compressed air rotary joint 6, and the left end of the spray gun outer tube 7 is sealed with the spray gun inner tube 2, and a liquid phase fluid cavity 24 is formed between the two. The liquid phase fluid rotary joint 8 is a tubular structure, and a liquid phase fluid interface is provided in the middle of the tube. Both ends of the liquid phase fluid rotary joint 8 are sleeved on the outer side wall of the left side of the spray gun outer tube 7 through bearings 4, and the bearings 4 are supported by the fastening bolts 3 sleeved on the spray gun outer tube 7 to limit the bearings 4 to prevent the liquid phase fluid rotary joint 8 from moving left and right. The connection between the liquid phase fluid rotary joint 8 and the spray gun outer tube 7 is provided with a sealing ring 5 to prevent the liquid phase from flowing out. A plurality of spray gun outer tube liquid inlet holes 12 are evenly opened on the side wall of the spray gun outer tube 7 facing the liquid phase fluid interface. A raised step is provided at the right end of the liquid phase fluid rotary joint 8, the cooling air duct 9 is fixedly sleeved on the raised step of the liquid phase fluid rotary joint 8, a cooling air inlet is provided in the middle of the cooling air duct 9, the wind wheel 10 is fixedly sleeved on the spray gun outer tube 7 directly facing the cooling air inlet, and the cooling air inlet and the wind wheel 10 adopt an eccentric structure; The air distribution and plate jet integrator 14 is a stepped structure, including a first step 25, a second step 26 and a third step 27. A plurality of air distribution holes 20 are evenly opened in the axial direction on the first step 25 and the second step 26, and a plurality of connecting holes 15 are evenly opened in the radial direction on the second step 26. The interior of the third step 27 is a jet hole 21, and the jet hole 21 is connected with 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, and the connecting hole 15 is connected with the liquid phase fluid cavity 24. The left port of the inner cavity of the plate jet integrator 14 is blocked by the second plug 13. The cutter 16 is fixed on the right port of the spray gun outer tube 7, and the nozzle 18 is arranged at the right end of the cutter 16. An inner cavity is provided in the middle of the nozzle 18, and a mixing column 22 is provided in the middle of the right end face of the inner cavity. A plurality of outwardly diverging spray holes 19 are evenly provided 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, and the air distribution hole 20 is connected to the gas phase fluid cavity 23 on the left side and to the inner cavity of the cutter 16 on the right side. The inner cavity of the cutter 16 is connected to the inner cavity of the nozzle 18, and the nozzle 18 is fixed to the right end of the spray gun outer tube 7 through a nozzle fastener 17.

[0013] The operation process of the present invention: When the spray gun is working, compressed air enters from the compressed air inlet interface of the compressed air rotary joint 6, enters the gas phase fluid cavity 23 through the air inlet hole 11 of the spray gun inner tube and moves to the right, and the liquid phase fluid enters from the liquid phase fluid interface of the liquid phase fluid rotary joint 8, enters the liquid phase fluid cavity 24 through the liquid inlet hole 12 of the spray gun outer tube and moves to the right. During the movement of the liquid phase fluid to the right, the spray gun outer tube 7 is cooled and reaches the right end of the liquid phase fluid cavity 24, and then the liquid phase flows into the air distribution cavity from all sides through the connecting hole 15. The gas phase fluid in the gas phase fluid cavity 23 passes through the air distribution holes 20 around the plate jet integrator 14 and is then sprayed into the inner cavity of the cutter 16 at a high speed, cutting the liquid phase fluid sprayed from the jet hole 21 and performing gas-liquid mixing and atomization. The atomized gas-liquid mixture enters the inner cavity of the nozzle 18 and collides on the mixing column 22 to be further atomized and then sprayed out through the spray hole 19; At the same time, cooling air enters from the eccentric air inlet of the cooling air duct 9 and blows directly to the wind wheel 10, driving the wind wheel 10 to rotate. The wind wheel 10 further drives the spray gun to rotate as a whole. When the spray gun rotates itself, it can offset the bending deformation caused by its own gravity and flow field impact force after high-temperature softening. After passing through the wind wheel 10, the cooling air flows through the cooling air duct to cool the spray gun and then enters the furnace.

Claims

1. A self-cooling rotating high temperature resistant double fluid spray gun, characterized in that: The spray gun comprises 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 wind wheel (10), an air distribution and plate jet integrator (14), a cutter (16) and a spray head (18), wherein the left end port of the inner tube (2) of the spray gun is blocked by a first plug (1), the compressed air rotary joint (6) is a tubular structure, a compressed air inlet interface is provided in the middle of the tube, both ends of the compressed air rotary joint (6) are sleeved on the outer wall of the inner tube (2) of the spray gun near the first plug (1) through bearings (4), and the bearings (4) are supported by fastening bolts (3) sleeved on the inner tube (2), and a plurality of inner tube air inlet holes (11) of the spray gun are evenly provided on the side wall of the inner tube (2) of the spray gun directly facing the compressed air inlet interface; The spray gun outer tube (7) is fixedly sleeved on the outer side wall of the spray gun inner tube (2) on the right side of the compressed air rotary joint (6), and the left end of the spray gun outer tube (7) is sealed with the spray gun inner tube (2), and a liquid phase fluid cavity (24) is formed between the two. The liquid phase fluid rotary joint (8) is a tubular structure, and a liquid phase fluid interface is provided in the middle of the tube. The two ends of the liquid phase fluid rotary joint (8) are sleeved on the outer side wall of the left side of the spray gun outer tube (7) through bearings (4), and the bearings (4) are supported by fastening bolts (3) sleeved on the spray gun outer tube (7). A plurality of spray gun outer tube liquid inlet holes (12) are evenly opened on the side wall of the spray gun outer tube (7) directly opposite to the liquid phase fluid interface. A raised step is provided at the right end of the liquid phase fluid rotary joint (8); the cooling air duct (9) is fixedly sleeved on the raised step of the liquid phase fluid rotary joint (8); a cooling air inlet is provided in the middle of the cooling air duct (9); the wind wheel (10) is fixedly sleeved on the spray gun outer tube (7) directly opposite to the cooling air inlet, and the cooling air inlet and the wind wheel (10) adopt an eccentric structure; The air distribution and plate jet integrator (14) is fixedly mounted on the right port of the spray gun inner tube (2), and the left port of the inner cavity of the air distribution and plate jet integrator (14) is blocked by a second plug (13). The cutter (16) is fixedly mounted on the right port of the spray gun outer tube (7), and the nozzle (18) is arranged at the right end of the cutter (16).

2. A self-cooling rotary high temperature resistant double fluid spray gun according to claim 1, characterized in that: The air distribution and plate jet integrator (14) is a step-shaped structure, comprising a first step (25), a second step (26) and a third step (27); a plurality of air distribution holes (20) are evenly provided on the first step (25) and the second step (26) along the axial direction; a plurality of connecting holes (15) are evenly provided on the second step (26) along the radial direction; the third step (27) has a jet hole (21) inside, and 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; and the connecting hole (15) is connected to the liquid phase fluid cavity (24).

3. A self-cooling rotary high temperature resistant double fluid spray gun according to claim 2, characterized in that: An inner cavity is provided in the middle of the nozzle (18), a mixing column (22) is provided in the middle of the right end surface of the inner cavity, and a plurality of outwardly diverging spray holes (19) are evenly provided on the right end surface of the nozzle (18) around the mixing column (22).

4. A self-cooling rotary high temperature resistant double 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 air distribution hole (20) is connected to the gas phase fluid cavity (23) on the left side and to the inner cavity of the cutter (16) on the right side; the inner cavity of the cutter (16) is connected to the inner cavity of the nozzle (18).

5. The self-cooling rotary high temperature resistant two-fluid spray gun according to claim 1, characterized in that: The spray head (18) is fixed to the right end of the spray gun outer tube (7) via a spray head fastener (17).

6. The self-cooling rotary high temperature resistant double fluid spray gun according to claim 1, characterized in that: A sealing ring (5) is provided at the connection between the compressed air rotary joint (6) and the spray gun inner tube (2), and at the connection between the liquid phase fluid rotary joint (8) and the spray gun outer tube (7).

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