High-flow low-gas-consumption cooling spray gun

Abstract

The utility model discloses a high-flow low-air-consumption cooling spray gun which comprises a gun barrel and a spray head connected with the gun barrel, the gun barrel comprises an outer gun barrel used for conveying compressed air and an inner gun barrel used for conveying cooling water, and a liquid spinning disk is arranged in the inner gun barrel. A liquid channel communicated with the outer gun barrel and a gas channel communicated with the inner gun barrel are arranged in the spray head, a gas guide mechanism is arranged in the spray head, and compressed air in the gas channel is mixed with cooling water flowing through the liquid channel in a hedging mode according to a certain rotational flow angle through the gas guide mechanism. Cooling water and compressed air can be more fully headed and mixed in the inner cavity of the spray head at a certain rotational flow angle through the liquid rotational flow piece and the gas rotational flow guide mechanism, the impact acting efficiency of the compressed air is greatly improved, the gas consumption rate is reduced to 13% under the working condition that the average atomization particle size of the spray gun is smaller than or equal to 40 micrometers, the atomization efficiency is improved, and the service life of the spray head is prolonged. Energy consumption of the flue gas cooling spray gun is reduced, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler smoke cooling spraying, in particular to a large-flow and low-gas-consumption cooling spray gun. Background Art

[0002] In the boiler industry, flue gas must be effectively cooled and tempered before passing through the dust collector. In the flue gas spray cooling technology, the average atomization particle size of the spray is usually required to be ≤40μm to ensure that the spray evaporates in a very short time, thereby effectively reducing the flue gas temperature and avoiding incompletely evaporated water droplets. In the original spray technology, only when the gas consumption rate of the spray gun is higher than 18% can the average atomization particle size be effectively guaranteed to be ≤40μm. For example, the boiler flue gas volume of a certain factory is 117276Nm3 / h, and the corresponding cooling water consumption is 28m 3 / h, every 1% increase in gas consumption means an additional 228.5Nm 3 / h of compressed air, that is, 21kW·h of electricity, is costly. Therefore, the energy consumption of flue gas cooling spray guns has become a difficult problem that troubles users and manufacturers. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a large-flow, low-gas-consumption cooling spray gun to solve the above-mentioned problems.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A large-flow, low-gas-consumption cooling spray gun comprises a gun rod and a nozzle connected to the gun rod, wherein the gun rod comprises an outer gun barrel for conveying compressed air and an inner gun barrel for conveying cooling water, the inner gun barrel is provided with a liquid swirl sheet, the nozzle is provided with a liquid channel connected to the outer gun barrel and a gas channel connected to the inner gun barrel, and the nozzle is provided with a gas guide mechanism, wherein the gas guide mechanism causes the compressed air in the gas channel to counteract and mix with the cooling water flowing through the liquid channel at a certain swirl angle.

[0006] In the above utility model, further, the nozzle includes a nozzle seat, a gas guide mechanism and an atomizing head connected in sequence, the nozzle seat is fixedly connected to the gun rod, the gas channel and the liquid channel are both arranged on the nozzle seat, and the gas channel is an annular U-shaped groove arranged circumferentially along the nozzle seat, and the bottom end of the gas channel is evenly distributed with a plurality of air circulation holes.

[0007] In the above-mentioned utility model, further, the gas guide mechanism includes a gas swirl seat and a gas swirl sheet arranged between the gas swirl seat and the nozzle seat, a liquid nozzle connected to the liquid channel is arranged in the gas swirl seat, and the gas swirl sheet is provided with an axial hole and is slidably sleeved on the outer circular surface of the inlet end of the liquid nozzle through the axial hole.

[0008] In the above utility model, further, the gas swirl sheet is provided with a plurality of air circulation holes 2 evenly distributed along the circumference, the gas swirl seat is also provided with an annular U-shaped groove and a plurality of air circulation holes 3 evenly distributed on the bottom surface of the groove, the number of the air circulation holes 2 is two less than the number of the air circulation holes 3, the annular U-shaped groove on the nozzle seat is directly opposite to the annular U-shaped groove on the gas swirl seat and the air circulation holes 1 are consistent with the air circulation holes 3.

[0009] In the above utility model, further, a gas nozzle is provided at the internal connection between the gas swirl seat and the atomizing head, a mixing ring and an impact piece are provided inside the atomizing head, a through hole is provided on the gas nozzle, and the two ends of the through hole are respectively connected to the air circulation hole three and the spray through hole on the mixing ring, the inlet sections of the through hole on the gas nozzle and the spray through hole on the mixing ring are both conical contraction structures, and the outlet end of the liquid nozzle extends into the through hole on the gas nozzle.

[0010] In the above-mentioned utility model, further, the nozzle seat is also provided with an inner tube threaded hole and is rotatably connected to the gas swirl seat through the inner tube threaded hole, and an annular flange is also provided on the outer side of the annular U-shaped groove on the nozzle seat to limit the assembly gap between the nozzle seat and the swirl seat, the gas swirl sheet is movably arranged in the assembly gap, and an annular groove is also designed on the outer side of the end of the gas swirl seat.

[0011] In the above utility model, further, the outer circumference of the gas nozzle is a step structure, the end of the gas swirl seat is provided with a groove matching the step structure, and the gas swirl seat is fixed at the connection between the gas swirl seat and the atomizing head through a clearance fit.

[0012] In the above utility model, further, the outer surface of the connection between the gas swirl seat and the atomizer head is threadedly connected with an external pressure sleeve, one end of the external pressure sleeve is provided with a conical inverted structure, and the outer cylinder of the atomizer head is provided with a conical flange structure that cooperates with the conical inverted structure.

[0013] In the above utility model, further, the atomizing head is provided with spray injection holes which are evenly distributed along the circumference and inclined, and an impact piece is provided on the central axis of the atomizing head.

[0014] In the above utility model, further, the inlet end of the inner barrel is connected with an elbow and a liquid joint, the outer barrel is connected with a gas joint, and an end face sealing ring is provided at the end of the outer barrel away from the nozzle, the rotation direction of the liquid swirl sheet is right-handed and the rotation axis coincides with the axis of the gun barrel.

[0015] The beneficial effect of the utility model is that the utility model can make the cooling water and the compressed air more fully impact and mix in the inner chamber of the nozzle at a certain swirl angle through the liquid swirl sheet and the gas swirl guide mechanism, greatly improving the impact work efficiency of the compressed air, so that the gas consumption rate is reduced to 13% under the condition that the average atomization particle size of the spray gun is ≤40μm, thereby improving the atomization efficiency, reducing the energy consumption of the flue gas cooling spray gun, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the nozzle of the utility model;

[0018] Figure 3 It is a partial enlarged view of the utility model A;

[0019] Figure 4 This is a schematic diagram of the structure of the gas swirl seat of the utility model;

[0020] Figure 5 for Figure 4 Left view of

[0021] Figure 6 This is a schematic diagram of the structure of the gas swirl sheet of the utility model;

[0022] Figure 7 It is a structural schematic diagram of the liquid swirl sheet of the utility model.

[0023] In the figure, 1-nozzle, 101-nozzle seat, 102-gas swirl sheet, 103-liquid nozzle, 104-gas swirl seat, 105-gas nozzle, 106-mixing ring, 107-atomizing head, 108-impact member, 109-outer pressure sleeve, 110-air circulation hole one, 111-air circulation hole two, 112-air circulation hole three, 113-annular flange, 114-annular groove, 115-spray injection hole, 2-gun rod, 201-outer barrel, 202-inner barrel, 203-liquid swirl sheet, 204-end face sealing ring, 205-elbow, 206-liquid joint, 207-gas joint. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Please see attached Figure 1 -Attached Figure 3 As shown, a large flow rate and low gas consumption cooling spray gun comprises a gun rod 2 and a nozzle 1 connected to the gun rod 2, wherein the gun rod 2 comprises an outer gun barrel 201 for conveying compressed air and an inner gun barrel 202 for conveying cooling water. Figure 1 As shown, the inner barrel 202 is arranged inside the outer barrel 201, wherein an end face sealing ring 204 is provided at one end of the outer barrel 201 away from the nozzle 1, so that a closed chamber for conveying compressed air is formed inside the outer barrel 201, and a gas connector 207 is connected to the outer barrel 201, and compressed air enters the outer barrel 201 from the gas connector 207, and an elbow 205 and a liquid connector 206 are connected to the inlet end of the inner barrel 202, and cooling water enters the inner barrel 202 from the elbow 205 and the liquid connector 206;

[0026] The inner barrel 202 is provided with a liquid swirl sheet 203, which is fixed by spot welding at both ends. Figure 7 As shown, the rotation direction of the liquid swirl blade 203 is right-handed and the rotation axis coincides with the axis of the gun barrel 2, so that the cooling water in the inner gun barrel 202 is squeezed into the nozzle 1 in a clockwise spiral under the action of the liquid swirl blade 203;

[0027] The nozzle 1 is provided with a liquid channel connected to the outer barrel 201 and a gas channel connected to the inner barrel 202, so that the cooling water is squeezed into the liquid channel in a clockwise spiral, and a gas guide mechanism is provided in the nozzle 1. The gas guide mechanism makes the compressed air in the gas channel and the cooling water flowing through the liquid channel collide and mix at a certain swirl angle to atomize the cooling water. The gas guide mechanism makes the compressed air spirally injected into the nozzle 1 in a counterclockwise direction. The spiral intake directions of the cooling water and the compressed air are opposite, so that the two collide at high speed in the nozzle 1 to form a primary spray, which greatly improves the atomization efficiency.

[0028] Please see attached Figure 2-3 As shown, the nozzle 1 includes a nozzle seat 101, a gas guide mechanism and an atomizing head 107 connected in sequence, the nozzle seat 101 is fixedly connected to the gun barrel 2, the gas channel and the liquid channel are both arranged on the nozzle seat 101, and the gas channel is an annular U-shaped groove (not shown in the drawings) arranged circumferentially along the nozzle seat 101, and a plurality of air circulation holes 110 are evenly distributed at the bottom end of the gas channel; specifically, the compressed air and cooling water are separately transmitted in the nozzle seat 101, and the gas guide mechanism is used to increase the impact force of the compressed air and change the rotation angle of the compressed air injected into the atomizing head 107, and the compressed air and cooling water finally complete the primary and secondary counter-mixing and atomization in the atomizing head 107.

[0029] Please see attached Figure 3-6 As shown, the gas guide mechanism includes a gas swirl seat 104 and a gas swirl sheet 102 arranged between the gas swirl seat 104 and the nozzle seat 101. A liquid nozzle 103 connected to the liquid channel is arranged in the gas swirl seat 104. The gas swirl sheet 102 is provided with an axial hole and is slidably sleeved on the outer circular surface of the inlet end of the liquid nozzle 103 through the axial hole. As shown in the figure, a certain gap is left between the gas swirl sheet 102 and the nozzle seat 101, so that the gas swirl sheet 102 can rotate on the outer circular surface of the inlet end of the liquid nozzle 103.

[0030] As attached Figure 5 and attached Figure 6 As shown in the figure, the gas swirl sheet 102 is provided with a plurality of air circulation holes 2 111 evenly distributed along the circumference, and the gas swirl seat 104 is also provided with an annular U-shaped groove (not shown in the figure) and a plurality of air circulation holes 3 112 evenly distributed on the bottom surface of the groove, and the number of the air circulation holes 2 111 is two less than the number of the air circulation holes 3 112, so as to ensure that the intensity distribution of the compressed air ejected from the gas swirl seat 104 at any time always presents a "duckbill shape", that is, the wind force at the "second and fourth quadrant point" is the strongest and gradually weakens toward the "first and third quadrant point", as shown in the figure. Figure 5 As shown, the annular U-shaped groove on the nozzle seat 101 is directly opposite to the annular U-shaped groove on the gas swirl seat 104, and the air circulation hole 110 is consistent with the air circulation hole 3 112. An air circulation channel of the gas guide mechanism is formed through the air circulation hole 110, the air circulation hole 2 111, the air circulation hole 3 112 and the annular U-shaped groove on the gas swirl seat 104. The compressed air flows through the above-mentioned channels in sequence and is finally injected into the atomizing head 107 at a specific swirl angle; and during assembly, it is necessary to ensure that the air circulation hole 110 and the air circulation hole 3 112 are deflected at a certain angle to ensure that the compressed air in the annular U-shaped groove forms a counterclockwise rotating atmosphere, thereby pushing the gas swirl sheet 102 to rotate counterclockwise.

[0031] Please see attached Figure 2As shown, a gas nozzle 105 is further provided at the internal connection between the gas swirl seat 104 and the atomizing head 107, a mixing ring 106 and an impact member 108 are provided inside the atomizing head 107, a through hole is provided on the gas nozzle 105, and the two ends of the through hole are respectively connected to the air flow hole 112 and the spray through hole on the mixing ring 106, and the inlet sections of the through hole on the gas nozzle 105 and the spray through hole on the mixing ring 106 are both tapered contraction structures, and the compressed air after swirl flows through the gas nozzle 105 and is pressurized by its tapered contraction structure and then injected into the spray on the mixing ring 106 at a high speed. The atomizing head 107 is provided with a spray hole 115 which is evenly distributed along the circumference, and an impact piece 108 is provided on the central axis of the atomizing head 107. The connection between the impact piece 108 and the atomizing head 107 is machined and smoothed after welding. The spray after the first atomization passes through the spray hole on the mixing ring 106 under pressure and hits the impact piece 108 at a high speed, is further atomized, and then is sprayed out through the spray hole 115.

[0032] In the above embodiment, preferably, the nozzle seat 101 is also provided with an inner tube threaded hole and is rotatably connected to the gas swirl seat 104 through the inner tube threaded hole, and an annular flange 113 is also provided on the outer side of the annular U-shaped groove on the nozzle seat 101 for limiting the assembly gap between the nozzle seat 101 and the swirl seat, and the gas swirl sheet 102 is movably arranged in the assembly gap to ensure that the gas swirl sheet 102 can rotate freely in the assembly gap, thereby realizing the guidance of the compressed air, and an annular groove 114 is also designed on the outer side of the end of the gas swirl seat 104, and the annular groove 114 is used to fix the metal winding gasket to play a sealing role.

[0033] In the above embodiment, preferably, the outer circumference of the gas nozzle 105 is a step structure, and the end of the gas swirl seat 104 is provided with a slot that cooperates with the step structure. The gas swirl seat 104 is fixed at the connection between the gas swirl seat 104 and the atomizing head 107 through a clearance fit, and the inner hole of the gas nozzle 105 and the atomizing head 107 is also an axial hole clearance fit and the gap is slightly larger to fill the sealant.

[0034] An external pressure sleeve 109 is threadedly connected to the outer surface of the connection between the gas swirl seat 104 and the atomizer head 107. One end of the external pressure sleeve 109 is provided with a conical inverted structure. The outer cylinder of the atomizer head 107 is provided with a conical flange structure that cooperates with the conical inverted structure. The atomizer head 107 is rotatably connected to the gas swirl seat 104 through the external pressure sleeve 109 and pressed tightly.

[0035] Specific working process:

[0036] First, cooling water enters the inner barrel 202 from the liquid joint 206 through the elbow 205, and at the same time, compressed air enters the outer barrel 201 from the gas joint 207. Then, the liquid in the inner barrel 202 is squeezed into the liquid nozzle 103 in a clockwise spiral under the action of the liquid swirl sheet 203. At the same time, the compressed air in the outer barrel 201 flows through the air circulation hole 110 through the annular U-shaped groove on the nozzle seat 101, and then reaches the gas swirl sheet 102. According to the corresponding positions of the air circulation hole 2 111 and the air circulation hole 3 112 on the gas swirl sheet 102, the compressed air flows counterclockwise in the annular U-shaped groove arranged opposite to each other on the nozzle seat 101 and the gas swirl seat 104, thereby promoting the gas swirl sheet 102 to rotate. After being guided by the gas swirl sheet 102 and the gas swirl seat 104, the compressed air spirals counterclockwise into the tapered necking area of ​​the gas nozzle 105. Then, after being compressed by the gas nozzle 105, the compressed air spirals counterclockwise at high speed into the spray through hole of the mixing ring 106. At the same time, the liquid in the liquid nozzle 103 is also injected into the spray through hole of the mixing ring 106 clockwise and fully collides and mixes with the compressed air to form a primary spray. Then, the spray in the mixing ring 106 passes through the tapered necking structure at the outlet of the mixing ring 106 and is injected into the inner cavity of the atomizing head 107 at high speed. Subsequently, the spray impacts the impact piece 108 at high speed to form a secondary spray. Finally, the spray is compressed by the injection hole on the atomizing head 107 and then ejected at high speed to form a final spray.

[0037] The liquid swirl sheet 203 and the gas swirl guide mechanism can make the cooling water and the compressed air more fully mixed in the atomizing head 107, greatly improving the impact work efficiency of the compressed air, so that the gas consumption rate is reduced to 13% under the condition that the average atomized particle size of the spray gun is ≤40μm. For example, the utility model is used in a machine with a cooling water consumption of 28m 3 When applied to a boiler with a capacity of 100 kW·h, 105 kW·h of electric energy can be saved per hour. Therefore, the utility model has great promotion value in the installation and application of denitration injection devices.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0039] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A large-flow, low-gas-consumption cooling spray gun, comprising a gun rod (2) and a spray head (1) connected to the gun rod (2), characterized in that: The gun rod (2) comprises an outer gun barrel (201) for conveying compressed air and an inner gun barrel (202) for conveying cooling water, a liquid swirl sheet (203) is arranged in the inner gun barrel (202), a liquid channel connected to the outer gun barrel (201) and a gas channel connected to the inner gun barrel (202) are arranged in the nozzle (1), and a gas guide mechanism is arranged in the nozzle (1), and the gas guide mechanism makes the compressed air in the gas channel counteract and mix with the cooling water flowing through the liquid channel according to a certain swirl angle.

2. A high-flow, low-gas-consumption cooling spray gun according to claim 1, characterized in that: The nozzle (1) comprises a nozzle seat (101), a gas guide mechanism and an atomizing head (107) which are connected in sequence, the nozzle seat (101) is fixedly connected to the gun rod (2), the gas channel and the liquid channel are both arranged on the nozzle seat (101), and the gas channel is an annular U-shaped groove arranged along the circumference of the nozzle seat (101), and the bottom end of the gas channel is evenly distributed with a plurality of air circulation holes (110).

3. A high-flow, low-gas-consumption cooling spray gun according to claim 2, characterized in that: The gas guide mechanism comprises a gas swirl seat (104) and a gas swirl sheet (102) arranged between the gas swirl seat (104) and the nozzle seat (101); a liquid nozzle (103) connected to the liquid channel is arranged in the gas swirl seat (104); an axial hole is arranged on the gas swirl sheet (102) and is slidably sleeved on the outer circular surface of the inlet end of the liquid nozzle (103) through the axial hole.

4. A large flow rate, low gas consumption and cooling spray gun according to claim 3, characterized in that: The gas swirl sheet (102) is provided with a plurality of air circulation holes (111) evenly distributed along the circumference, the gas swirl seat (104) is also provided with an annular U-shaped groove and a plurality of air circulation holes (112) evenly distributed on the bottom surface of the groove, the number of the air circulation holes (111) is two less than the number of the air circulation holes (112), the annular U-shaped groove on the nozzle seat (101) is directly opposite to the annular U-shaped groove on the gas swirl seat (104), and the number of the air circulation holes (110) is the same as the number of the air circulation holes (112).

5. A large flow rate, low gas consumption, cooling spray gun according to claim 4, characterized in that: A gas nozzle (105) is also provided at the internal connection between the gas swirl seat (104) and the atomizing head (107). A mixing ring (106) and an impact piece (108) are provided inside the atomizing head (107). A through hole is provided on the gas nozzle (105). The two ends of the through hole are respectively connected to the air circulation hole three (112) and the spray through hole on the mixing ring (106). The inlet sections of the through hole on the gas nozzle (105) and the spray through hole on the mixing ring (106) are both of a conical contraction structure, and the outlet end of the liquid nozzle (103) extends into the through hole on the gas nozzle (105).

6. A large flow rate, low gas consumption, cooling spray gun according to claim 4, characterized in that: The nozzle seat (101) is also provided with an inner tube threaded hole and is rotatably connected to the gas swirl seat (104) via the inner tube threaded hole. An annular flange (113) is also provided on the outer side of the annular U-shaped groove on the nozzle seat (101) for limiting the assembly gap between the nozzle seat (101) and the swirl seat. The gas swirl sheet (102) is movably arranged in the assembly gap. An annular groove (114) is also designed on the outer side of the end of the gas swirl seat (104).

7. A large flow rate, low gas consumption, cooling spray gun according to claim 5, characterized in that: The outer circumference of the gas nozzle (105) is a step structure, and the end of the gas swirl seat (104) is provided with a slot that matches the step structure. The gas swirl seat (104) is fixed at the connection between the gas swirl seat (104) and the atomizing head (107) through clearance fit.

8. The high-flow, low-gas-consumption cooling spray gun according to claim 5, characterized in that: An outer pressure sleeve (109) is threadedly connected to the outer surface of the connection between the gas swirl seat (104) and the atomizing head (107); one end of the outer pressure sleeve (109) is provided with a conical inverted structure; and the outer cylinder of the atomizing head (107) is provided with a conical flange structure that cooperates with the conical inverted structure.

9. A large flow rate, low gas consumption, cooling spray gun according to claim 8, characterized in that: The atomizing head (107) is provided with spray injection holes which are evenly distributed along the circumference and inclined, and an impact member (108) is provided on the central axis of the atomizing head (107).

10. The high-flow, low-gas-consumption cooling spray gun according to claim 1, characterized in that: The inlet end of the inner gun barrel (202) is connected to an elbow (205) and a liquid joint (206); the outer gun barrel (201) is connected to a gas joint (207); and an end face sealing ring (204) is provided at the end of the outer gun barrel (201) away from the nozzle (1); the rotation direction of the liquid swirl plate (203) is right-handed and the rotation axis coincides with the axis of the gun barrel (2).

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