A two-stage fuel main gun and regenerative combustor

Abstract

This application provides a two-stage fuel main nozzle and a regenerator. The two-stage fuel main nozzle includes a heavy fuel tank, a circulation nozzle, and a spray nozzle. The heavy fuel tank and circulation nozzle are located outside the regenerator. The circulation nozzle is connected to the heavy fuel tank via an inlet pipe to pressurize the heavy fuel and deliver it to the spray nozzle. The spray nozzle is located inside the regenerator and includes a nozzle body and a sub-nozzle located at the front end of the nozzle body. The nozzle body has an oil passage and an air passage, one end of which is connected to the circulation nozzle, and the other end of which is equipped with an oil-air mixing assembly. The oil-air mixing assembly includes multiple evenly distributed oil inlets and multiple air inlets, with the oil inlets connected to the oil passage and the air inlets connected to the air passage. The oil inlets and air inlets are connected to the sub-nozzle through a mixing chamber. The fuel main nozzle provided by this application can avoid high-temperature damage to components, achieve full mixing and atomization of heavy fuel and air, reduce residual blockage, extend service life, and improve combustion efficiency.

Description

Technical Field

[0001] This disclosure generally relates to the field of asphalt mixing technology, and specifically to a two-stage fuel main nozzle and a regenerating burner. Background Technology

[0002] A blue concrete mixing plant is a type of machinery used to professionally produce asphalt concrete. It is widely used in projects such as highways and airports that require asphalt concrete pavement. It typically employs a burner to dry the aggregate in the drum, evaporating its moisture and mixing it with the asphalt. The main fuel nozzle of the burner is the core component of this system.

[0003] The demand for recycled asphalt is increasing, but recycled drying cylinder burners currently face the following problems: The primary drying cylinder dries aggregate, which has relatively poor heat storage capacity and carries away less heat, resulting in less damage to the main nozzle. However, the recycled drying cylinder contains recycled asphalt, which, due to its adhesion to the cylinder wall, has a strong heat storage capacity. At high discharge temperatures, the overflowing air volume carries away a significant amount of heat. Since the main fuel nozzle is typically installed inside the burner housing, this hot air significantly damages the fuel nozzle's gas pipe and cables in the recycled burner. Furthermore, the high temperature leads to insufficient mixing of heavy oil and air, affecting the injection effect. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a two-stage fuel main gun and regenerative burner to solve the above problems.

[0005] The first aspect of this application provides a two-stage fuel main gun for a regenerative burner, including a heavy oil tank, a circulation gun, and a spray gun; The heavy oil tank and the circulating gun are located outside the regenerating burner. The circulating gun is connected to the heavy oil tank through an oil inlet pipe and is used to pressurize the heavy oil and deliver it to the gun. The spray gun is located inside the regenerating burner and includes a gun body and a sub-nozzle located at the front end of the gun body. The gun body has an oil passage and an air passage inside. One end of the oil passage and the air passage are connected to the circulating gun, and the other end is provided with an oil-air mixing assembly. The oil-air mixing assembly includes multiple evenly distributed oil inlets and multiple air inlets. The oil inlets are connected to the oil passage, and the air inlets are connected to the air passage. The oil inlets and the air inlets are connected to the sub-nozzle through a mixing chamber.

[0006] According to the technical solution provided in the embodiments of this application, the oil-gas mixing component includes: The first diverter has an air guide channel connecting both ends and multiple oil guide channels. The multiple oil guide channels are arranged around the air guide channel. The oil guide channels connect the oil passage and the oil inlet. The air guide channel connects the air passage and the air inlet. The second diverter has a plurality of air inlets arranged in a ring, and the plurality of oil inlets are arranged in a ring on the outer periphery of the plurality of air inlets; the second diverter has an annular baffle on the side near the diverter nozzle, the annular baffle is located between the air inlets and the oil inlets, and has a plurality of through holes; the mixing chamber is formed on the inner side of the annular baffle.

[0007] According to the technical solution provided in the embodiments of this application, the first diverter is provided with a first annular oil groove and a second annular oil groove at both ends. The first annular oil groove and the second annular oil groove are both located on the outer periphery of the air guide channel. The first annular oil groove and the second annular oil groove are connected through the oil guide channel. The second annular oil groove and the second diverter cooperate to form a second annular oil cavity.

[0008] According to the technical solution provided in the embodiments of this application, the oil-gas mixing assembly further includes a manifold, which is disposed between the gun body and the first diverter, and after being fitted with the first diverter, it cooperates with the first annular oil groove to form a first annular oil cavity; the manifold is provided with an oil guide path and an air guide path, the oil guide path connects the oil passage and the first annular oil cavity, and the air guide path connects the air passage and the air guide channel.

[0009] According to the technical solution provided in the embodiments of this application, a handle is provided at the end of the gun body away from the nozzle.

[0010] According to the technical solution provided in the embodiments of this application, the circulation gun is provided with an oil inlet, an oil return port, and an oil supply port; the oil supply port is connected to the oil passage through an oil supply pipeline, the oil inlet is connected to the oil inlet pipeline, the oil return port is connected to the heavy oil tank through an oil return pipeline, and a first on / off valve is provided on the oil return pipeline.

[0011] According to the technical solution provided in the embodiments of this application, the circulating gun is further provided with a first air port and a second air port; The two-stage fuel main nozzle also includes a pressure supply assembly, which includes an air compressor, a first air passage, and a second air passage. The first air passage is connected to the first air port of the air compressor, and the second air passage is connected to the second air port and the air passage. A second on / off valve is provided on the second air passage.

[0012] According to the technical solution provided in the embodiments of this application, the pressure supply component further includes a third air passage and a first three-way valve; the first three-way valve is located on the oil inlet pipe, and the first valve port is connected to the heavy oil tank, the second valve port is connected to the oil inlet, and the third valve port is connected to the air compressor through the third air passage.

[0013] According to the technical solution provided in the embodiments of this application, the pressure supply assembly further includes a fourth air passage and a second three-way valve; the second three-way valve is disposed on the first air passage, and the first valve port is connected to the air compressor, the second valve port is connected to the first air port, and the third valve port is connected to the oil supply pipeline through the fourth air passage.

[0014] A second aspect of this application provides a regenerative burner, including a burner body and a two-stage fuel main gun as described above.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: by placing the heavy oil tank and circulation gun outside the regenerating burner, the direct impact of the high-temperature hot air from the regenerating drying cylinder is effectively avoided, significantly reducing the risk of damage to the oil and gas circuit components by the hot air and extending the service life of the main gun; at the same time, the spray gun is located inside the burner, and its internal oil-gas mixing components cooperate with the mixing chamber through evenly distributed oil and air inlets, ensuring full mixing and efficient atomization of heavy oil and compressed air, improving combustion stability and efficiency; the overall structure is compact, reducing the possibility of heavy oil residue and drying in the gun body, and reducing maintenance frequency and operating costs. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the two-section fuel nozzle provided in Example 1; Figure 2 for Figure 1 The diagram shows the structure of the spray gun in the two-section fuel main gun. Figure 3 for Figure 2 A rear view of the spray gun shown. Figure 4 for Figure 2 A schematic diagram of the front view structure of the spray gun shown. Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure at position AA in the middle; Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 for Figure 2 A side view of the spray gun shown. Figure 8 for Figure 7 A cross-sectional view of the CC position; Figure 9 for Figure 7 A cross-sectional view of the DD position in the middle; Figure 10This is a schematic diagram of the regenerative burner provided in Example 2.

[0017] Reference numerals: 1. Heavy oil tank; 2. Circulation gun; 3. Spray gun; 4. Oil inlet pipe; 5. Oil return pipe; 6. Oil supply pipe; 7. Gun body; 8. Dividing nozzle; 9. Oil passage; 10. Air passage; 11. Oil inlet; 12. Air inlet; 13. Mixing chamber; 14. First diverter; 15. Air guide channel; 16. Oil guide channel; 17. Second diverter; 18. Barrier; 19. Through hole; 20. First annular oil groove; 21. Second annular oil groove; 22. Convergence. Components; 23. Oil guide passage; 24. Air guide passage; 25. Handle; 26. Oil inlet; 27. Oil return port; 28. Oil supply port; 29. ​​First on / off valve; 30. First air port; 31. Second air port; 32. Air compressor; 33. First air passage; 34. Second air passage; 35. Second on / off valve; 36. Third air passage; 37. First three-way valve; 38. Fourth air passage; 39. Second three-way valve; 40. Burner body; 41. First lock nut; 42. Second lock nut. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1 Please refer to Figures 1-9 This embodiment provides a two-stage fuel main gun for a regenerative burner, including a heavy oil tank 1, a circulation gun 2 and a spray gun 3; The heavy oil tank 1 and the circulating gun 2 are located outside the regenerating burner. The circulating gun 2 is connected to the heavy oil tank 1 through the oil inlet pipe 4, and is used to pressurize the heavy oil and deliver it to the spray gun 3. The spray gun 3 is located inside the regenerator and includes a gun body 7 and a sub-nozzle 8 located at the front end of the gun body 7. The gun body 7 has an oil passage 9 and an air passage 10 inside. One end of the oil passage 9 and the air passage 10 is connected to the circulating gun 2, and the other end is provided with an oil-gas mixing assembly. The oil-gas mixing assembly includes a plurality of evenly distributed oil inlets 11 and a plurality of air inlets 12. The oil inlets 11 are connected to the oil passage 9, and the air inlets 12 are connected to the air passage 10. The oil inlets 11 and the air inlets 12 are connected to the sub-nozzle 8 through a mixing chamber 13.

[0021] Specifically, the heavy oil tank 1 is used to store heavy oil. Both the heavy oil tank 1 and the circulating gun 2 are installed outside the regenerator, away from the high-temperature area of ​​the regenerator drying cylinder. This layout avoids the high-temperature hot air overflowing from the regenerator drying cylinder from directly impacting the oil circuit, gas circuit, and related control components, reducing the aging and damage of heat to gas pipes, cables, and oil circuit seals, and extending the service life of components. The spray gun 3 is installed inside the burner housing, close to the combustion operation area. Its front nozzle 8 faces the combustion area directly, ensuring that the atomized fuel can accurately participate in combustion to meet the drying requirements.

[0022] The spray gun 3 has an integrated gun body 7 with two independent oil passages 9 and air passages 10 arranged axially inside. These two passages extend in parallel and do not interfere with each other, respectively handling the functions of heavy oil delivery and compressed air delivery. One end of the oil passage 9 is connected to the external circulation gun 2 via a pipeline, and the other end extends to the oil-air mixing assembly at the front end of the gun body 7. The circulation gun 2 is connected to the heavy oil tank 1 via an oil inlet pipe 4, which pressurizes the heavy oil output from the heavy oil tank 1 during operation, ensuring that the heavy oil can be stably and efficiently delivered to the oil-air mixing assembly through the oil passage 9. One end of the air passage 10 is also connected to the circulation gun 2, and the other end is connected to the oil-air mixing assembly. It is used to receive compressed air provided by an external air source device and guide it to the oil-air mixing assembly to mix with the heavy oil.

[0023] The oil-air mixing assembly has multiple evenly distributed oil inlets 11 and multiple air inlets 12. The oil inlets 11 are connected to the oil passages 9 inside the gun body 7, and the air inlets 12 are connected to the air passages 10, ensuring that heavy oil and air are evenly distributed to each interface. The output ends of the oil inlets 11 and air inlets 12 are connected to a mixing chamber 13. After entering the mixing chamber 13 through the oil inlet 11, the heavy oil comes into full contact, collides, and mixes with the compressed air delivered through the air inlet 12, forming a uniform oil-air mixture. The output end of the mixing chamber 13 is connected to a distributor nozzle 8. The fully mixed oil-air mixture is atomized and sprayed out through the distributor nozzle 8, forming a stable combustion flame, improving combustion efficiency and heat utilization, while reducing fuel waste.

[0024] Furthermore, the oil-gas mixing assembly includes: The first diverter 14 has an air guide channel 15 connecting both ends and a plurality of oil guide channels 16. The plurality of oil guide channels 16 are arranged around the air guide channel 15. The oil guide channel 16 connects the oil passage 9 and the oil port 11. The air guide channel 15 connects the air passage 10 and the air port 12. The second diverter 17 has a plurality of air inlets 12 arranged in a ring, and a plurality of oil inlets 11 arranged in a ring on the outer periphery of the plurality of air inlets 12; the second diverter 17 has an annular baffle portion 18 on the side near the diverter nozzle 8, the annular baffle portion 18 is located between the air inlets 12 and the oil inlets 11, and has a plurality of through holes 19; the mixing chamber 13 is formed on the inner side of the annular baffle portion 18.

[0025] Specifically, the oil-gas mixing assembly includes a first diverter 14, a second diverter 17, and a functional structure formed by their cooperation. The first diverter 14 is located near the gun body 7, and the second diverter 17 is located near the nozzle 8. The two are sealed together to achieve precise connection between the oil and gas circuits, preventing media leakage or cross-flow. In this embodiment, the outer wall of the first diverter 14 is provided with external threads, and the nozzle 8 and the second diverter 17 are locked onto the first diverter 14 by a first lock nut 41.

[0026] The first diverter 14 is a cylindrical metal component, and it is sealed to the front end of the gun body 7 and the second diverter 17. The air guide channel 15 is opened along the central axis of the first diverter 14. It is a cylindrical channel that runs through both ends. One end is sealed to the air passage 10 of the gun body 7, and the other end extends to the end face that fits with the second diverter 17. It is used to concentrate the compressed air delivered by the air passage 10 and guide it to the subsequent air port 12 to ensure stable airflow without deviation. There are 4-6 oil guide channels 16, which are evenly distributed in a ring on the outer periphery of the air guide channel 15. One end is connected to the oil passage 9 of the gun body 7, and the other end extends to the end face that fits with the second diverter 17. It is used to divert the heavy oil in the oil passage 9 to the subsequent oil port 11.

[0027] The second diverter 17 is also a cylindrical metal component, with its front end sealed to the nozzle 8 and its rear end fitted to the first diverter 14. The number of vents 12 matches the number of air channels 15 in the first diverter 14, and they are arranged in a ring around the center of the end face of the second diverter 17 near the mixing chamber 13. One end connects to the air channel 15 of the first diverter 14, and the other end faces the mixing chamber 13, allowing compressed air to be dispersed into multiple high-speed airflows that are injected into the mixing chamber 13. The number of oil ports 11 corresponds one-to-one with the oil channels 16, and they are arranged in a ring around the outer periphery of the vents 12. One end connects to the oil channel 16 of the first diverter 14, and the other end faces the mixing chamber 13, allowing heavy oil to be dispersed into multiple fine streams, which then form a surrounding mixture with the airflow ejected from the vents 12.

[0028] The baffle 18 is an annular protrusion integrally formed on the end face of the second diverter 17 near the mixing chamber 13, and located between the vent 12 and the oil inlet 11. Its function is to physically block and prolong the contact time between the heavy oil stream and compressed air in the mixing chamber 13, preventing them from being sprayed out before they are fully mixed. Simultaneously, the baffle 18 has multiple through holes 19, allowing the heavy oil to flow into the mixing chamber 13. The mixing chamber 13 is a cylindrical cavity formed by the inner wall of the baffle 18 and the end face of the front end of the second diverter 17, with its front end connected to the nozzle 8. The heavy oil and compressed air, dispersed by the oil inlet 11 and the vent 12, form a uniform oil-air mixture within the mixing chamber 13 through airflow disturbance, collision, and the flow-limiting effect of the baffle 18, and are finally atomized and sprayed out through the nozzle 8.

[0029] Furthermore, the first diverter 14 is provided with a first annular oil groove 20 and a second annular oil groove 21 at both ends. The first annular oil groove 20 and the second annular oil groove 21 are both located on the outer periphery of the air guide channel 15. The first annular oil groove 20 and the second annular oil groove 21 are connected through the oil guide channel 16. The second annular oil groove 21 cooperates with the second diverter 17 to form a second annular oil cavity.

[0030] Specifically, the first annular oil groove 20 is located on the end face of the first distributor 14 near the gun body 7, and is coaxially annular. Its inner diameter is slightly larger than the diameter of the air guide channel 15, and its outer diameter is slightly smaller than the outer diameter of the first distributor 14. The first annular oil groove 20 is used to receive heavy oil transported by the oil passage 9 inside the gun body 7, and achieves temporary storage and pressure stabilization of the heavy oil through the annular cavity, avoiding local insufficient or excessive oil supply caused by oil pressure fluctuations at the end of the oil passage 9. The second annular oil groove 21 is located on the end face of the first distributor 14 near the second distributor 17, and is coaxially arranged with the first annular oil groove 20. Its size is the same as the first annular oil groove 20, and it is connected to the first annular oil groove 20 through the oil guide channel 16 inside the first distributor 14. The second annular oil groove 21 is used to evenly distribute the heavy oil after pressure stabilization in the first annular oil groove 20 to the outlet end of each oil guide channel 16, providing a stable and uniform oil flow for the oil inlet 11 of the subsequent second distributor 17.

[0031] It should be noted that both the first annular oil groove 20 and the second annular oil groove 21 are located on the outer periphery of the air guide channel 15 and are completely isolated from the air guide channel 15, ensuring that the heavy oil flows only within the oil circuit system formed by the oil groove and the oil guide channel 16, avoiding cross-flow with the compressed air in the air guide channel 15. Figure 6 As shown, when the first diverter 14 and the second diverter 17 are sealed together, the second annular oil groove 21 and the end face of the second diverter 17 near the first diverter 14 together form a closed annular cavity, namely the second annular oil cavity.

[0032] Furthermore, the oil-gas mixing assembly also includes a manifold 22, which is disposed between the gun body 7 and the first diverter 14, and after being fitted with the first diverter 14, it cooperates with the first annular oil groove 20 to form a first annular oil cavity; the manifold 22 is provided with an oil guide path 23 and an air guide path 24, the oil guide path 23 connects the oil passage 9 and the first annular oil cavity, and the air guide path 24 connects the air passage 10 and the air guide channel 15.

[0033] Specifically, such as Figure 5 , Figure 6 As shown, the manifold 22 is a cylindrical metal component installed between the front end face of the gun body 7 and the rear end face of the first diverter 14, and locked onto the gun body 7 by the second locking nut 42. The manifold 22 serves as a transitional connector between the gun body 7 and the first diverter 14, converting the single-path oil passage 9 and air passage 10 within the gun body 7 into a multi-path distribution structure adapted to the first diverter 14, while ensuring the sealing and stability of the medium flow. Both the oil passage 23 and the air passage 24 are straight channels. The oil passage 23 receives the heavy oil delivered by the oil passage 9 within the gun body 7 and guides it into the first annular oil cavity formed by the first annular oil groove 20 and the end face of the manifold 22. The air passage 24 guides the compressed air delivered by the air passage 10 within the gun body 7 to the air passage 15 of the first diverter 14 without loss.

[0034] Furthermore, a handle 25 is provided at the end of the gun body 7 away from the nozzle 8.

[0035] Specifically, such as Figure 2 , Figure 3 As shown, the handle 25 is a one-piece molded metal component with an overall U-shaped structure. It is fixed to the rear end face of the gun body 7 away from the nozzle 8 by welding or bolting. When the spray gun 3 needs to be installed into the burner housing, the operator can hold the handle 25 to stabilize the position of the gun body 7 and accurately align it with the mounting holes on the burner housing, avoiding problems such as unstable grip and collision damage to the nozzle 8 or oil-gas mixing assembly due to the smooth surface of the gun body 7 lacking a pressure point. When the spray gun 3 needs to be disassembled for maintenance, the operator can hold the handle 25 to apply axial pulling force and directly pull the gun body 7 out of the burner housing.

[0036] Furthermore, the circulation gun 2 is provided with an oil inlet 26, an oil return port 27, and an oil supply port 28; the oil supply port 28 is connected to the oil passage 9 through the oil supply pipeline 6, the oil inlet 26 is connected to the oil inlet pipeline 4, the oil return port 27 is connected to the heavy oil tank 1 through the oil return pipeline 5, and the oil return pipeline 5 is provided with a first on / off valve 29.

[0037] Specifically, such as Figure 1 , Figure 4As shown, the circulating gun 2, as the core component for heavy oil delivery and pressurization, integrates three dedicated interfaces on its housing: an oil inlet 26, an oil return port 27, and an oil supply port 28. The oil inlet 26 is located on the lower side of the circulating gun 2 housing and is sealed to one end of the oil inlet pipe 4. It receives room-temperature heavy oil from the heavy oil tank 1, providing a stable oil source for the circulating gun 2. The oil return port 27 is located on the bottom side of the circulating gun 2 housing and is connected to the heavy oil tank 1 via the oil return pipe 5. It is mainly used for the recirculation of heavy oil during the preheating stage and the recovery of residual heavy oil during the purging stage, preventing heavy oil from stagnating in the pipes. The oil supply port 28 is located at the front middle of the circulating gun 2 housing and is sealed to the oil passage 9 of the spray gun 3 via the oil supply pipe 6. Its function is to stably deliver the high-temperature heavy oil pressurized by the circulating gun 2 to the spray gun 3, providing power for combustion atomization. The first on / off valve 29 is an electromagnetic ball valve, installed at one end of the return oil line 5 near the return oil port 27 of the circulation gun 2. The valve body is connected to the return oil line 5 by a threaded seal. The valve control circuit is electrically connected to the main control system of the burner and is used to control the on / off of the return oil line 5.

[0038] Furthermore, the circulating gun 2 is also provided with a first air port 30 and a second air port 31; The two-stage fuel main nozzle also includes a pressure supply assembly, which includes an air compressor 32, a first air passage 33 and a second air passage 34. The first air passage 33 is connected to the first air port 30 of the air compressor 32, and the second air passage 34 is connected to the second air port 31 and the air passage 10. A second on / off valve 35 is provided on the second air passage 34.

[0039] Specifically, such as Figure 1 , Figure 4 As shown, two dedicated air passage interfaces, a first air port 30 and a second air port 31, are added to the housing of the circulating gun 2, independent of the original oil passage interface. The first air port 30 is located on one side of the middle of the housing of the circulating gun 2 and communicates with the oil passage cavity inside the circulating gun 2, used to receive compressed air from the pressure supply component. The second air port 31 is located on one side of the front end of the housing of the circulating gun 2 and communicates with the air passage inside the circulating gun 2. This air passage is independent of the oil passage cavity, and its other end is connected to the air passage 10 of the spray gun 3, mainly used to supply compressed air to the air passage 10 to provide atomization power for oil-air mixing.

[0040] The pressure supply assembly is the core of compressed air generation and delivery, including an air compressor 32, a first air passage 33, a second air passage 34, and a second on / off valve 35. All components are sealed together via high-pressure air pipes. The air compressor 32's discharge capacity is adapted to the air demand of the main nozzle, continuously producing dry, clean compressed air to prevent moisture or impurities from entering the air passages and affecting atomization or causing component corrosion. The first air passage 33 is a high-pressure air pipe, one end of which is sealed to the outlet of the air compressor 32, and the other end connects to the first air port 30 of the circulating gun 2, used to deliver compressed air to the internal oil passage cavity of the circulating gun 2. The second air passage 34 is also a high-pressure air pipe, one end of which is branched to the outlet of the air compressor 32, and the other end connects to the second air port 31 of the circulating gun 2, specifically used to deliver compressed air to the air passage 10 of the spray gun 3, ensuring the atomization requirements of the oil-air mixture. The second on / off valve 35 is installed at one end of the second gas passage 34 near the second gas port 31. The valve body is connected to the gas pipe in a threaded seal. The valve control line is connected to the burner main control system, which can realize automatic on / off control.

[0041] Furthermore, the pressure supply assembly also includes a third air passage 36 and a first three-way valve 37; the first three-way valve 37 is located on the oil inlet pipe 4, and the first valve port is connected to the heavy oil tank 1, the second valve port is connected to the oil inlet 26, and the third valve port is connected to the air compressor 32 through the third air passage 36.

[0042] Specifically, the third air passage 36 uses a high-pressure air pipe made of the same material as the existing air passage pipe. One end is sealed and connected to the outlet branch of the air compressor 32, and the other end is connected to the third valve port of the first three-way valve 37, used to deliver the compressed air generated by the air compressor 32 to the oil inlet pipe 4. The first three-way valve 37 is a high-pressure electromagnetic three-way valve, installed at the end of the oil inlet pipe 4 near the heavy oil tank 1. The valve body is fixed by a threaded sealing connection. Its first valve port is sealed and connected to the oil outlet of the heavy oil tank 1 through the front section of the oil inlet pipe 4, used to receive the heavy oil output from the heavy oil tank 1; the second valve port is sealed and connected to the oil inlet 26 of the circulation gun 2 through the rear section of the oil inlet pipe 4, used to deliver heavy oil to the circulation gun 2; the third valve port is sealed and connected to the output end of the third air passage 36.

[0043] Furthermore, the pressure supply assembly also includes a fourth air passage 38 and a second three-way valve 39; the second three-way valve 39 is disposed on the first air passage 33, and the first valve port is connected to the air compressor 32, the second valve port is connected to the first air port 30, and the third valve port is connected to the oil supply pipeline 6 through the fourth air passage 38.

[0044] Specifically, the fourth air passage 38 uses a high-pressure air pipe made of the same material as the existing air passage pipe. One end is sealed to the third valve port of the second three-way valve 39, and the other end is branched to the end of the oil supply line 6 near the oil passage 9 of the spray gun 3. This is used to directly deliver compressed air to the end of the oil supply line 6 and the inlet of the oil passage 9. The second three-way valve 39 is a high-pressure electromagnetic three-way valve, installed at the end of the first air passage 33 near the first air port 30 of the circulation gun 2. The valve body is fixed by a threaded seal. The first valve port is sealed to the air outlet of the air compressor 32 through the front section of the first air passage 33 to receive compressed air. The second valve port is sealed to the first air port 30 of the circulation gun 2 through the rear section of the first air passage 33 to deliver clean air into the circulation gun 2. The third valve port is sealed to the input end of the fourth air passage 38 to divert compressed air to the end of the oil supply line 6.

[0045] With the above structure, the two-stage fuel main nozzle provided in this embodiment can switch between three modes: preheating mode, combustion mode and purge mode. When in preheating mode, the first on / off valve 29 is energized and opened, the air compressor 32, the second on / off valve 35 and the first air port 30 are closed, the first and second valve ports of the first three-way valve 37 are connected and the third valve port is closed, the room temperature heavy oil in the heavy oil tank 1 enters the heating chamber inside the circulation gun 2 through the oil inlet pipe 4 and the oil inlet 26 of the circulation gun 2 to be heated, and the heated heavy oil flows back to the heavy oil tank 1 through the oil return port 27 of the circulation gun 2, the oil return pipe 5 and the opened first on / off valve 29 to form a closed loop circulation.

[0046] When in combustion mode, the first on / off valve 29 is de-energized and closed, the second on / off valve 35 is energized and opened, the air compressor 32 starts, the first and second valve ports of the second three-way valve 39 are open, and the third valve port is closed. Compressed air enters the circulation gun 2 through the first air passage 33, part of which is used to pressurize the heavy oil in the circulation gun 2, and the other part is discharged through the second air port 31. At the same time, the heavy oil in the heavy oil tank 1 enters and is pressurized through the oil inlet pipe 4 and the oil inlet 26 of the circulation gun 2, and then flows into the oil passage 9 of the gun body 7 of the spray gun 3 through the oil supply port 28 and the oil supply pipe 6, and then passes through the manifold 22, the guide oil passage 23, the first diverter 14, the first annular oil groove 20, and the guide oil channel 16 in sequence. The second annular oil groove 21 is injected into the outer periphery of the mixing chamber 13 from the oil inlet 11 of the second diverter 17; the compressed air discharged from the second air inlet 31 enters the air passage 10 of the gun body 7 through the second air passage 34, and is injected at high speed into the central area of ​​the mixing chamber 13 from the air inlet 12 of the second diverter 17 through the air guide passage 24 of the manifold 22 and the air guide channel 15 of the first diverter 14. The oil and gas are fully mixed in the mixing chamber 13 by the flow restriction of the baffle 18 and the disturbance of the through hole 19, and are atomized into oil droplets by the nozzle 8. They are mixed with the combustion air and ignited to form a stable flame. The control system adjusts the oil supply pressure, air supply pressure and combustion air flow in real time through sensor feedback to ensure stable combustion temperature.

[0047] When in purge mode, the circulation gun 2 stops supplying oil, the second shut-off valve 35 is de-energized and closed, the first shut-off valve 29 is energized and opened, the second and third ports of the first three-way valve 37 are open, and the first, second, and third ports of the second three-way valve 39 are all open. The air compressor 32 continues to work, and the compressed air is divided into three paths: the first path enters the circulation gun 2 through the first air passage 33, the second port of the second three-way valve 39, and the first air port 30 of the circulation gun 2, pushing the residual heavy oil in the circulation gun and the middle section of the oil supply line 6 to flow towards the return port 27; the second ... third port of the circulation gun 2, pushing the residual heavy oil in the circulation gun and the middle section of the oil supply line 6 to flow towards the return port 27; the third path enters the circulation gun 2 through the first The three air passages 36 and the third valve port of the first three-way valve 37 enter the rear section of the oil inlet pipeline 4, pushing the residual heavy oil in the pipeline to flow towards the oil inlet 26 of the circulation gun 2; the third passage enters the end of the oil supply pipeline 6 through the third valve port of the second three-way valve 39 and the fourth air passage 38, cleaning the residual heavy oil at the end of the oil supply pipeline and the inlet of the oil passage 9. Some air will also blow away the residue in the mixing chamber 13 and the nozzle 8 through the oil passage 9, the manifold 22, the guide oil passage 23, the guide oil channel 16 of the first diverter 14, the oil passage 11 of the second diverter 17, and the remaining heavy oil in the spray gun 3 is discharged from the nozzle 8.

[0048] Example 2 Please refer to Figure 10 This embodiment provides a regenerative burner, including a burner body 40 and a two-stage fuel main nozzle as described in Embodiment 1.

[0049] Specifically, the burner body 40 is the core installation and combustion carrier of the regener burner, and has a combustion chamber inside. The two-stage fuel main gun is the core combustion component of the burner, and its spray gun 3 extends into the combustion chamber of the burner body 40. The gun body 7 is fastened by a sealing flange and bolts. The heavy oil tank 1, circulation gun 2, air compressor 32 and other components are fixed to the outside of the burner body 40 by brackets, and are precisely connected to the spray gun 3 through the oil inlet pipe 4, oil supply pipe 6, first air line 33 and other pipelines.

[0050] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A two-stage fuel main nozzle for a regenerative burner, characterized in that, Includes heavy oil tank (1), circulation gun (2) and spray gun (3); The heavy oil tank (1) and the circulating gun (2) are located outside the regenerator. The circulating gun (2) is connected to the heavy oil tank (1) through the oil inlet pipe (4) and is used to pressurize the heavy oil and deliver it to the spray gun (3). The spray gun (3) is located inside the regenerator and includes a gun body (7) and a sub-nozzle (8) located at the front end of the gun body (7). The gun body (7) is provided with an oil passage (9) and an air passage (10). One end of the oil passage (9) and the air passage (10) are connected to the circulating gun (2), and the other end is provided with an oil-gas mixing assembly. The oil-gas mixing assembly includes a plurality of evenly distributed oil inlets (11) and a plurality of air inlets (12). The oil inlets (11) are connected to the oil passage (9), and the air inlets (12) are connected to the air passage (10). The oil inlets (11) and the air inlets (12) are connected to the sub-nozzle (8) through a mixing chamber (13).

2. The two-stage fuel nozzle according to claim 1, characterized in that, The oil-gas mixing assembly includes: The first diverter (14) has an air guide channel (15) connecting both ends and a plurality of oil guide channels (16). The plurality of oil guide channels (16) are arranged around the air guide channel (15). The oil guide channel (16) connects the oil passage (9) and the oil port (11). The air guide channel (15) connects the air passage (10) and the air port (12). The second diverter (17) has a plurality of air inlets (12) arranged in a ring, and a plurality of oil inlets (11) arranged in a ring on the outer periphery of the plurality of air inlets (12); the second diverter (17) has an annular baffle (18) on the side near the diverter nozzle (8), the annular baffle (18) is located between the air inlets (12) and the oil inlets (11), and has a plurality of through holes (19); the mixing chamber (13) is formed inside the annular baffle (18).

3. The two-stage fuel nozzle according to claim 2, characterized in that, The first diverter (14) has a first annular oil groove (20) and a second annular oil groove (21) at both ends. The first annular oil groove (20) and the second annular oil groove (21) are both located on the outer periphery of the air guide channel (15). The first annular oil groove (20) and the second annular oil groove (21) are connected through the oil guide channel (16). The second annular oil groove (21) and the second diverter (17) cooperate to form a second annular oil cavity.

4. The two-stage fuel nozzle according to claim 3, characterized in that, The oil-gas mixing assembly also includes a manifold (22), which is located between the gun body (7) and the first diverter (14), and after being fitted with the first diverter (14), it cooperates with the first annular oil groove (20) to form a first annular oil cavity; the manifold (22) is provided with an oil guide path (23) and an air guide path (24), the oil guide path (23) connects the oil passage (9) and the first annular oil cavity, and the air guide path (24) connects the air passage (10) and the air guide channel (15).

5. The two-stage fuel nozzle according to claim 4, characterized in that, The gun body (7) has a handle (25) at the end away from the nozzle (8).

6. The two-stage fuel nozzle according to claim 5, characterized in that, The circulating gun (2) is provided with an oil inlet (26), an oil return port (27), and an oil supply port (28); the oil supply port (28) is connected to the oil passage (9) through the oil supply pipeline (6), the oil inlet (26) is connected to the oil inlet pipeline (4), the oil return port (27) is connected to the heavy oil tank (1) through the oil return pipeline (5), and the oil return pipeline (5) is provided with a first on / off valve (29).

7. The two-stage fuel nozzle according to claim 6, characterized in that, The circulating gun (2) is also provided with a first air port (30) and a second air port (31); The two-stage fuel main gun also includes a pressure supply assembly, which includes an air compressor (32), a first air passage (33), and a second air passage (34). The first air passage (33) is connected to the first air port (30) of the air compressor (32), and the second air passage (34) is connected to the second air port (31) and the air passage (10). A second on / off valve (35) is provided on the second air passage (34).

8. The two-stage fuel nozzle according to claim 7, characterized in that, The pressure supply assembly also includes a third air passage (36) and a first three-way valve (37); the first three-way valve (37) is located on the oil inlet pipeline (4), and the first valve port is connected to the heavy oil tank (1), the second valve port is connected to the oil inlet (26), and the third valve port is connected to the air compressor (32) through the third air passage (36).

9. The two-stage fuel nozzle according to claim 8, characterized in that, The pressure supply assembly also includes a fourth air passage (38) and a second three-way valve (39); the second three-way valve (39) is located on the first air passage (33), and the first valve port is connected to the air compressor (32), the second valve port is connected to the first air port (30), and the third valve port is connected to the oil supply pipeline (6) through the fourth air passage (38).

10. A regenerative burner, characterized in that, It includes a burner body (40) and a two-stage fuel gun as described in any one of claims 1-9.

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