Dual fuel dual swirled burner and method of operation thereof

Abstract

The application discloses a dual-fuel dual-swirl burner and a working method thereof, and belongs to the technical field of combustion equipment. The burner comprises a wind cylinder, one end of the wind cylinder is provided with an inlet end, the other end is provided with an outlet end, an air supporting channel is arranged in the wind cylinder, the wind cylinder comprises, from outside to inside, a gas pipeline, a dual-swirl flame stabilizing disc and an oil pipeline which are coaxially arranged, an external air loop is formed between the dual-swirl flame stabilizing disc and the wind cylinder, and an internal air loop is formed between the dual-swirl flame stabilizing disc and the oil pipeline; a sparking electrode is arranged at a gas outlet of the gas pipeline and an oil outlet of the oil pipeline, and the gas outlet of the gas pipeline, the oil outlet of the oil pipeline, the sparking electrode and the dual-swirl flame stabilizing disc are arranged at the outlet end of the wind cylinder. The dual-swirl flame stabilizing disc comprises a secondary swirler and a primary swirler arranged in the secondary swirler, and the primary swirler and the secondary swirler adopt a reverse swirl structure. The application solves the problems of single fuel adaptability, low flexibility of combustion flame shape adjustment and insufficient combustion stability of the internal heating heat treatment process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combustion equipment, in particular to a dual-fuel dual-swirl burner used in heat treatment and a working method thereof. BACKGROUND

[0002] The internal heating method heat treatment is a popular process for the overall heat treatment of large equipment in China. Light diesel oil is often used as fuel in the internal heating method heat treatment. The fuel is sent into the tower through a blower and a nozzle and atomized, and the high-temperature gas flow generated by the continuous combustion of the fuel conducts heat convection and flame thermal radiation in the inner wall of the tower body to heat the tower body to the required temperature for heat treatment.

[0003] The fuel sent into the tower is generally first atomized and the atomized fuel is fully contacted with air. To achieve this, a flame stabilizing device is usually installed at the head of the burner. The flame stabilizing disc of the burner nozzle is also called a cyclone sheet or a cyclone, which mainly organizes the gas flow, stabilizes the flame, and makes the flame into a certain shape. It is an important component of the nozzle. In the internal heating method heat treatment process, if the flame length is too long, the fuel will hit the wall, the fuel will coke, the combustion will be incomplete, the pollutant emission will be high, and the service life of the equipment will be short. If the flame length is too short, the average temperature in the combustion chamber will be too low, and the combustion and heat transfer efficiency will be low. In the case of using diesel fuel, the mixing condition of the atomized diesel fuel with air is poor, which leads to incomplete combustion, high pollution emission, unstable flame, and other problems. Rotating jet flow is an effective measure to strengthen combustion and organize flame, strengthen mixing and shorten flame length, improve combustion efficiency, and control and reduce pollutant emissions, and is widely used in various burners. The principle of generating swirling flow in the flame of the burner is to set a swirling device (flame stabilizing disc / cyclone) in the fluid flow channel. The cyclone makes the flowing fluid produce tangential velocity, so that it rotates. If a strong swirling flow is generated, a backflow zone will be established in the center part of the flame during combustion. This backflow zone will play an important role in stabilizing the flame and has a positive effect on reducing the flame length and increasing the combustion intensity.

[0004] In terms of economy and environmental protection, using natural gas fuel is more economical and environmentally friendly than using diesel fuel, and has certain advantages. In the application field of China Petrochemical which is rich in natural gas storage, natural gas can be selected as fuel, or natural gas and diesel can be selected as mixed fuel to provide for the combustion equipment.

[0005] Therefore, it is of great value and significance to develop a burner that can flexibly adjust the flame shape and improve the adaptability of the fuel. SUMMARY

[0006] The purpose of the present application is to solve the problems of single fuel adaptability, low flexibility of combustion flame shape adjustment and insufficient combustion stability in the internal heat treatment process, and to provide a dual-fuel dual-swirl burner device used in the internal heat treatment process.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] The first aspect of the present application discloses a dual-fuel dual-swirl burner, comprising:

[0009] The wind cylinder is provided with an inlet end at one end and an outlet end at the other end, and is provided with a combustion air channel inside; the wind cylinder comprises, from the outside to the inside, a gas pipeline, a dual-swirl flame stabilizer and an oil pipeline arranged coaxially, an external air loop is formed between the dual-swirl flame stabilizer and the wind cylinder, and an internal air loop is formed between the dual-swirl flame stabilizer and the oil pipeline; a sparking electrode is arranged at the gas outlet of the gas pipeline and the oil outlet of the oil pipeline; the gas outlet of the gas pipeline, the oil outlet of the oil pipeline, the sparking electrode and the dual-swirl flame stabilizer are all arranged at the outlet end of the wind cylinder; wherein,

[0010] The gas pipeline comprises a first gas pipeline and a second gas pipeline, the first gas pipeline and the second gas pipeline are uniformly and spacedly distributed along the circumference of the external air loop, the gas outlet of the first gas pipeline exceeds the dual-swirl flame stabilizer and gradually inclines towards the central axis of the dual-swirl flame stabilizer, and the gas outlet of the second gas pipeline exceeds the dual-swirl flame stabilizer and is parallel to the central axis of the dual-swirl flame stabilizer;

[0011] The dual-swirl flame stabilizer comprises a primary swirler and a secondary swirler, the primary swirler is arranged in the secondary swirler, the primary swirler has a central through hole at the central position, and the central through hole is used for placing the oil pipeline; the primary swirler and the secondary swirler adopt a reverse swirl structure, the two-stage swirler is composed of a swirl impeller in an annular shape, and the included angle between the blades of the swirl impeller forms a channel through which air flows.

[0012] Preferably, the dual-swirl flame stabilizer is fixedly arranged in the internal axis direction of the outlet end of the wind cylinder, the outlet end of the dual-swirl flame stabilizer has a preset distance from the outlet end of the wind cylinder, for example, a distance of 200mm.

[0013] Preferably, the primary cyclone comprises a first shroud cylinder and a first cyclone impeller, the secondary cyclone comprises a second shroud cylinder and a second cyclone impeller, the first shroud cylinder is coaxially nested in the second shroud cylinder, the first cyclone impeller is arranged in the first shroud cylinder, the second cyclone impeller is arranged between the first shroud cylinder and the second shroud cylinder, the blades of the first cyclone impeller and the blades of the second cyclone impeller are uniformly spaced in the circumferential direction, each blade on the first cyclone impeller has the same oblique angle with the circumferential tangent, and each blade on the second cyclone impeller has the same oblique angle with the circumferential tangent; the rotation directions of the first cyclone impeller and the second cyclone impeller are opposite.

[0014] More preferably, the oblique angles of the blades of the first cyclone impeller and the blades of the second cyclone impeller are different.

[0015] In a preferred embodiment, the oblique angle of the blades of the first cyclone impeller is 45°, and the oblique angle of the blades of the second cyclone impeller is 40°.

[0016] More preferably, the number of the blades of the first cyclone impeller and the number of the blades of the second cyclone impeller are different.

[0017] In a preferred embodiment, the number of the blades of the first cyclone impeller is 11, and the number of the blades of the second cyclone impeller is 22.

[0018] Preferably, the outer diameter of the double-cyclone flame stabilizer is 250 mm, and the height is 40 mm, and the height of the cyclone blades after being inclined is 30 mm.

[0019] Preferably, a support is fixed on the pipe wall of the fuel pipeline near the oil outlet, and the double-cyclone flame stabilizer is fixed above the support.

[0020] Preferably, the oil outlet of the fuel pipeline is flush with the outlet end of the internal air loop at the center of the double-cyclone flame stabilizer.

[0021] Preferably, an atomizing nozzle is arranged at the oil outlet of the fuel pipeline.

[0022] Preferably, the ignition electrode comprises a first high-energy ignition electrode and a second high-energy ignition electrode, the ignition end of the first high-energy ignition electrode is arranged near the oil outlet of the fuel pipeline, and the ignition end of the second high-energy ignition electrode is arranged near the gas outlet of the gas pipeline.

[0023] Preferably, the fuel pipeline is connected to an external fuel input assembly, the gas pipeline is connected to an external gas input assembly, and the inlet end of the air duct is further provided with a fan for blowing air into the air duct.

[0024] The second aspect of the application discloses a working method of a dual-fuel dual-swirl burner, comprising:

[0025] The dual-fuel dual-swirl burner enters a set working mode according to a control command, and the set working mode comprises any one of working mode one, working mode two and working mode three.

[0026] In working mode one, gas fuel is burned alone: the gas is sprayed out through a gas pipeline and ignited after energy is applied to an ignition electrode; wherein the gas is sprayed to the center direction of the dual-swirl flame stabilizer under the action of the first gas pipeline with a certain inclination angle, and the gas flowing to the center direction of the dual-swirl flame stabilizer is sucked to the upper side of the dual-swirl flame stabilizer under the action of the dual-swirl flame stabilizer, and a stable flame is formed above the dual-swirl flame stabilizer; the gas is sprayed along the axial direction of the second gas pipeline under the action of the second gas pipeline without inclination angle, so as to increase the length range of the flame.

[0027] In working mode two, oil fuel is burned alone: the oil is flowed into through an oil pipeline, atomized and sprayed to form a droplet spray, and the droplet spray forms a stable mixing area with air under the action of the suction formed by the dual-swirl flame stabilizer, and is ignited after energy is applied to the ignition electrode.

[0028] In working mode three, gas-oil dual fuel is burned: a small amount of oil or gas fuel is first introduced, ignited under the action of the ignition electrode, and then the other fuel is introduced, so that the other fuel is ignited at a high temperature when one fuel is working.

[0029] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0030] The dual-swirl flame stabilizer in the application has lower resistance and stronger swirl intensity than the general single-swirl flame stabilizer, so that the mixing of fuel and air is more sufficient, and the length of the formed flame can be shortened.

[0031] The ignition performance of the fuel is influenced by the swirl effect formed by the flame stabilizer to a certain extent, and according to the air flow condition, the swirl flame forms a backflow area to improve the ignition stability by sucking the heat of its own combustion and the high-temperature flue gas in the furnace. The swirl intensity of the dual-swirl flame stabilizer can be adjusted, and different numbers of blades and dual-swirl flame stabilizers with different inner and outer rotation directions can be replaced according to actual needs, so that the adjustment of the flame shape is more flexible. At the same time, in order to control the width of the flame generated by the burner used for internal combustion heat treatment, a ring channel is arranged between the dual-swirl flame stabilizer and the external air duct, and the air flowing through the ring channel can wrap the flame.

[0032] The application can improve the flow of the medium through the double-cyclone flame stabilizer by designing the number of blades, the size of the blades and the inclination angle of the blades of the double-cyclone flame stabilizer, and improve the situation of large resistance, low cyclone intensity and insufficient fuel mixing of the general single-cyclone flame stabilizer. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which form a part of this application, are intended to provide further understanding of the application and are incorporated herein for a purpose of explanations and are in no way limiting to the present application. In the drawings:

[0034] Figure 1 is a schematic view of the head structure of the double-cyclone dual-fuel burner;

[0035] Figure 2 is Figure 1 is a head A-A sectional view of the double-cyclone dual-fuel burner among them;

[0036] Figure 3 is a numerical simulation comparison result of the double-cyclone flame stabilizer and the single-cyclone flame stabilizer.

[0037] LEGEND:

[0038] 1, first gas pipeline; 2, second gas pipeline; 3, fuel pipeline; 4, first high-energy ignition electrode; 5, second high-energy ignition electrode; 6, primary cyclone; 7, secondary cyclone; 8, bracket; 9, internal air loop; 10, external air loop; 11, air duct. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and effect of the present application more clear and definite, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0040] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence, and it should be understood that such data can be interchanged under appropriate circumstances. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] EMBODIMENT:

[0042] Figure 1 is a schematic view of the head structure of the double-cyclone dual-fuel burner,Figure 2 is Figure 1 Figure 2 is a cross-sectional view of the double-fuel double-swirl burner head A-A.

[0043] As Figure 1 , Figure 2 shown, the double-fuel double-swirl burner comprises a wind tube 11 with a combustion air channel inside the shell, and a fuel gas pipeline, a double-swirl flame stabilizing disc, an ignition electrode and a fuel pipeline 3 arranged inside the wind tube 11. One end of the wind tube 11 is provided with an inlet end, and the other end is provided with an outlet end. The fuel gas pipeline, the double-swirl flame stabilizing disc formed by the primary swirler 6 and the secondary swirler 7, and the fuel pipeline 3 are coaxially arranged in the wind tube 11 from outside to inside. A support 8 is fixed to the pipe wall near the oil outlet of the fuel pipeline 3, and the double-swirl flame stabilizing disc is fixed above the support 8. An external air loop 10 is formed between the double-swirl flame stabilizing disc and the wind tube 11, and an internal air loop 9 is formed between the double-swirl flame stabilizing disc and the fuel pipeline 3. An ignition electrode is arranged at the gas outlet of the fuel gas pipeline and the oil outlet of the fuel pipeline 3, and the gas outlet of the fuel gas pipeline, the oil outlet of the fuel pipeline 3, the ignition electrode and the double-swirl flame stabilizing disc are arranged at the outlet end of the wind tube 11.

[0044] The fuel gas pipeline comprises a first fuel gas pipeline 1 and a second fuel gas pipeline 2, which are uniformly and spacedly distributed along the circumference of the external air loop 10. The gas outlet of the first fuel gas pipeline 1 gradually inclines to the central axis of the double-swirl flame stabilizing disc, that is, the gas outlet of the first fuel gas pipeline 1 has an angle and the direction is inward. The gas outlet of the second fuel gas pipeline 2 is parallel to the central axis of the double-swirl flame stabilizing disc, that is, the second fuel gas pipeline 2 is a vertical fuel gas pipeline.

[0045] The gas outlets of the first fuel gas pipeline 1 and the second fuel gas pipeline 2 both exceed a part of the double-swirl flame stabilizing disc, and the gas in the exceeding part is sprayed out, at which time the gas diffuses to the center of the double-swirl flame stabilizing disc under the entraining action of air to realize stable combustion. The second fuel gas pipeline 2 is beneficial to increase the length of the flame. The gas sprayed by the first fuel gas pipeline 1 with an angle diffuses and burns to the center under the action of the air current that is generated by the double-swirl flame stabilizing disc and is drawn to the center, and the gas sprayed by the second fuel gas pipeline 2 diffuses and burns in the external air loop 10. After the air passes through the double-swirl flame stabilizing disc, a stable recirculation zone is formed above the double-swirl flame stabilizing disc, which makes the air and the fuel fully mixed to realize stable combustion.

[0046] The double-cyclone flame-holding disc comprises a first cyclone 6 and a second cyclone 7, the first cyclone 6 is arranged in the second cyclone 7, the first cyclone 6 has a central through hole at the center position for placing the fuel pipeline 3. The first cyclone 6 and the second cyclone 7 adopt a reverse cyclone structure, the two cyclones are composed of cyclone impellers in a ring shape, and the included angle between the blades of the cyclone impellers forms a channel for air flow.

[0047] The first cyclone 6 comprises a first cover cylinder and a first cyclone impeller, the second cyclone 7 comprises a second cover cylinder and a second cyclone impeller, the first cover cylinder is coaxially nested in the second cover cylinder, the first cyclone impeller is arranged in the first cover cylinder, and the second cyclone impeller is arranged between the first cover cylinder and the second cover cylinder. The blades of the first cyclone impeller and the blades of the second cyclone impeller are uniformly and spacedly arranged in the circumferential direction, each blade on the first cyclone impeller has the same inclined included angle with the circumferential tangent, and each blade on the second cyclone impeller has the same inclined included angle with the circumferential tangent. The cyclone directions of the first cyclone impeller and the second cyclone impeller are opposite.

[0048] The ignition performance of fuel is influenced by the cyclone effect formed by the flame-holding disc to a certain extent. According to the air flow condition, the cyclone flame forms a backflow area to improve the ignition stability by sucking the heat of its own combustion and the high-temperature flue gas in the furnace. The cyclone intensity of the double-cyclone flame-holding disc is adjustable, different numbers of blades and double-cyclone flame-holding discs with opposite rotation directions can be replaced according to actual needs, so the adjustment of the flame shape is more flexible. At the same time, in order to control the width of the flame generated by the burner used for the internal combustion heat treatment, a ring channel is arranged between the double-cyclone flame-holding disc and the external air duct 11, and the air flowing through the ring channel can wrap the flame.

[0049] The number of blades, the size of blades and the inclination angle of blades of the double-cyclone flame-holding disc can improve the flow condition of the medium flowing through the double-cyclone flame-holding disc. In a preferred embodiment, the outer diameter of the double-cyclone flame-holding disc can be designed as 250 mm, the height is 40 mm, and the height of the inclined blade is 30 mm; the inclination angle of the blades of the first cyclone impeller can be set as 45°, the number of blades is 11, and the inclination angle of the blades of the second cyclone impeller can be set as 40°, the number of blades is 22. The double-cyclone flame-holding disc improves the conditions of large resistance, low cyclone intensity and insufficient fuel mixing under the general single-cyclone flame-holding disc.

[0050] The fuel pipe 3 is arranged at the center of the double-swirl flame stabilizer, and a support 8 is fixed on the fuel pipe 3. The double-swirl flame stabilizer is fixed above the support 8. The outlet of the fuel pipe 3 is flush with the outlet end of the internal air loop 9 at the center of the double-swirl flame stabilizer. The outlet of the fuel pipe 3 is provided with an atomizing nozzle, and the fuel is atomized and sprayed out with a certain angle, and is uniformly mixed with air under the action of the swirling gas. Part of the air flows through the internal air loop 9 at the center, and supplies oxygen to the central combustion area.

[0051] In order to enable the fuel to flow smoothly, high-energy ignition electrodes are arranged at a certain distance from the fuel outlet, and specifically include a first high-energy ignition electrode 4 and a second high-energy ignition electrode 5. The ignition end of the first high-energy ignition electrode 4 is arranged close to the outlet of the fuel pipe 3, and the ignition end of the second high-energy ignition electrode 5 is arranged close to the gas outlet of the gas pipe. The length of the air duct 11 exceeds the outlet end of the double-swirl flame stabilizer by 200 mm, so as to provide a certain space for the sufficient mixing of air and fuel, and also plays a role in stabilizing the flame. Combustion-supporting air flows into the inlet end of the air duct 11, and is separated under the action of the double-swirl flame stabilizer and the inner wall of the air duct 11.

[0052] The above-mentioned double-fuel double-swirl burner can select single-fuel combustion and two-fuel mixed combustion modes. When selecting single gas fuel combustion, the gas is sprayed out through the first gas pipe 1 and the second gas pipe 2. The gas is sprayed in the central direction of the double-swirl flame stabilizer under the action of the first gas pipe 1 with a certain angle, and the gas flowing in the central direction of the double-swirl flame stabilizer is sucked above the double-swirl flame stabilizer under the action of the double-swirl flame stabilizer, and is ignited after a certain energy is applied by the second high-energy ignition electrode 5, and a stable flame is formed above the double-swirl flame stabilizer. The presence of the second gas pipe 2 can increase the distribution range of the fuel in the axial direction, and thus increase the range of the flame length. When single fuel oil is used as fuel, the fuel flows in through the fuel pipe 3, and is atomized and sprayed to form a liquid droplet spray. Similarly, a stable mixing area is formed with air under the action of the double-swirl flame stabilizer, and is ignited by the first high-energy ignition electrode 4. When single fuel is used, another fuel can be injected as needed in the case of insufficient fuel, so as to avoid the working stop condition caused by insufficient fuel. When double fuel is used, on the one hand, one fuel is ignited at a high temperature when the other fuel is used; on the other hand, a small amount of fuel oil or gas fuel is first introduced, and is ignited after being ignited by the ignition electrode, and then the other fuel is introduced, so as to work in the form of igniting a large fire with a small fire.

[0053] The double-swirl flame-holding disc plays a role in that when the combustion air flows through the double-swirl flame-holding disc, strong swirls are formed above the double-swirl flame-holding disc to form rotating jet combustion. At the same time, a backflow zone is formed above the double-swirl flame-holding disc, which brings part of the fuel back to form secondary combustion, shortens the flame length and improves the combustion intensity.

[0054] Compared with the conventional single-swirl flame-holding disc, numerical simulation shows that the air medium flowing through the double-swirl flame-holding disc has lower resistance than the single-swirl flame-holding disc, proving that the double-swirl flame-holding disc can provide good flow capacity to facilitate the smooth discharge of flue gas from the flue gas outlet during combustion. The results are shown in Figure 3

[0055] In summary, the application provides a double-fuel double-swirl burner device used in an internal heat treatment process, which solves the problems of single fuel adaptability, low flexibility of combustion flame shape adjustment and insufficient combustion stability in the internal heat treatment process. The flame-holding disc with a double-swirl structure has lower resistance and stronger swirl intensity than the general single-swirl flame-holding disc, which can ensure the full mixing of fuel and achieve a stable combustion environment with stable swirl area and stable flame.

[0056] The specific embodiments of the application are described in detail above, but they are only examples, and the application is not limited to the specific embodiments described above. Any equivalent modifications and substitutions made by those skilled in the art to the application are also within the scope of the application. Therefore, any equivalent transformation and modification made without departing from the spirit and scope of the application should be covered within the scope of the application.​

Claims

1. A dual fuel dual swirl burner characterized by, The application relates to a gas burner, which comprises: a wind cylinder, one end of which is provided with an inlet end and the other end of which is provided with an outlet end, and the inside of the wind cylinder is provided with a combustion-supporting air channel; the wind cylinder comprises, from outside to inside, a gas pipeline, a double-rotation-flow stable flame disc and an oil pipeline which are coaxially arranged, an external air loop is formed between the double-rotation-flow stable flame disc and the wind cylinder, and an internal air loop is formed between the double-rotation-flow stable flame disc and the oil pipeline; a sparking electrode is arranged at the gas outlet of the gas pipeline and the oil outlet of the oil pipeline; the gas outlet of the gas pipeline, the oil outlet of the oil pipeline, the sparking electrode and the double-rotation-flow stable flame disc are arranged at the outlet end of the wind cylinder; wherein, the gas pipeline comprises a first gas pipeline and a second gas pipeline, the first gas pipeline and the second gas pipeline are uniformly distributed along the circumference of the external air loop, the gas outlet of the first gas pipeline is located beyond the double-rotation-flow stable flame disc and gradually inclines to the central axis of the double-rotation-flow stable flame disc, and the gas outlet of the second gas pipeline is located beyond the double-rotation-flow stable flame disc and is parallel to the central axis of the double-rotation-flow stable flame disc; the double-rotation-flow stable flame disc comprises a primary rotation-flow stabilizer and a secondary rotation-flow stabilizer, the primary rotation-flow stabilizer is arranged in the secondary rotation-flow stabilizer, the central position of the primary rotation-flow stabilizer is provided with a central through hole for placing the oil pipeline, the primary rotation-flow stabilizer and the secondary rotation-flow stabilizer adopt a reverse rotation-flow structure, the two-stage rotation-flow stabilizers are composed of annular rotation-flow impellers, and the included angle between the blades of the rotation-flow impellers forms a channel for air flow; the primary rotation-flow stabilizer comprises a first cover cylinder and a first rotation-flow impeller, the secondary rotation-flow stabilizer comprises a second cover cylinder and a second rotation-flow impeller, the first cover cylinder is coaxially nested in the second cover cylinder, the first rotation-flow impeller is arranged in the first cover cylinder, the second rotation-flow impeller is arranged between the first cover cylinder and the second cover cylinder, the blades of the first rotation-flow impeller and the blades of the second rotation-flow impeller are uniformly and spacedly arranged along the circumference, the included angle between each blade on the first rotation-flow impeller and a circumferential tangent is the same, the included angle between each blade on the second rotation-flow impeller and a circumferential tangent is the same, the rotation-flow directions of the first rotation-flow impeller and the second rotation-flow impeller are opposite, the inclination angle of the blades of the first rotation-flow impeller is 45 DEG, and the inclination angle of the blades of the second rotation-flow impeller is 40 DEG; the sparking electrode comprises a first high-energy sparking electrode and a second high-energy sparking electrode, the sparking end of the first high-energy sparking electrode is arranged close to the oil outlet of the oil pipeline, and the sparking end of the second high-energy sparking electrode is arranged close to the gas outlet of the gas pipeline. The double-rotation-flow stable flame disc is fixedly arranged in the internal axis direction of the outlet end of the wind cylinder, and the outlet end of the double-rotation-flow stable flame disc is 200 mm away from the outlet end of the wind cylinder. The oil pipeline is fixedly provided with a support on the pipe wall close to the oil outlet, and the double-rotation-flow stable flame disc is fixed above the support. The oil outlet of the oil pipeline is flush with the outlet end of the internal air loop at the center of the double-rotation-flow stable flame disc. An atomizing nozzle is arranged at the oil outlet of the oil pipeline. The application relates to a gas burner, which comprises: a wind cylinder, one end of which is provided with an inlet end and the other end of which is provided with an outlet end, and the inside of the wind cylinder is provided with a combustion-supporting air channel; the wind cylinder comprises, from outside to inside, a gas pipeline, a double-rotation-flow stable flame disc and an oil pipeline which are coaxially arranged, an external air loop is formed between the double-rotation-flow stable flame disc and the wind cylinder, and an internal air loop is formed between the double-rotation-flow stable flame disc and the oil pipeline; a sparking electrode is arranged at the gas outlet of the gas pipeline and the oil outlet of the oil pipeline; the gas outlet of the gas pipeline, the oil outlet of the oil pipeline, the sparking electrode and the double-rotation-flow stable flame disc are arranged at the outlet end of the wind cylinder; wherein, the gas pipeline comprises a first gas pipeline and a second gas pipeline, the first gas pipeline and the second gas pipeline are uniformly distributed along the circumference of the external air loop, the gas outlet of the first gas pipeline is located beyond the double-rotation-flow stable flame disc and gradually inclines to the central axis of the double-rotation-flow stable flame disc, and the gas outlet of the second gas pipeline is located beyond the double-rotation-flow stable flame disc and is parallel to the central axis of the double-rotation-flow stable flame disc; the double-rotation-flow stable flame disc comprises a primary rotation-flow stabilizer and a secondary rotation-flow stabilizer, the primary rotation-flow stabilizer is arranged in the secondary rotation-flow stabilizer, the central position of the primary rotation-flow stabilizer is provided with a central through hole for placing the oil pipeline, the primary rotation-flow stabilizer and the secondary rotation-flow stabilizer adopt a reverse rotation-flow structure, the two-stage rotation-flow stabilizers are composed of annular rotation-flow impellers, and the included angle between the blades of the rotation-flow impellers forms a channel for air flow; the primary rotation-flow stabilizer comprises a first cover cylinder and a first rotation-flow impeller, the secondary rotation-flow stabilizer comprises a second cover cylinder and a second rotation-flow impeller, the first cover cylinder is coaxially nested in the second cover cylinder, the first rotation-flow impeller is arranged in the first cover cylinder, the second rotation-flow impeller is arranged between the first cover cylinder and the second cover cylinder, the blades of the first rotation-flow impeller and the blades of the second rotation-flow impeller are uniformly and spacedly arranged along the circumference, the included angle between each blade on the first rotation-flow impeller and a circumferential tangent is the same, the included angle between each blade on the second rotation-flow impeller and a circumferential tangent is the same, the rotation-flow directions of the first rotation-flow impeller and the second rotation-flow impeller are opposite, the inclination angle of the blades of the first rotation-flow impeller is 45 DEG, and the inclination angle of the blades of the second rotation-flow impeller is 40 DEG; the sparking electrode comprises a first high-energy sparking electrode and a second high-energy sparking electrode, the sparking end of the first high-energy sparking electrode is arranged close to the oil outlet of the oil pipeline, and the sparking end of the second high-energy sparking electrode is arranged close to the gas outlet of the gas pipeline.

2. A dual fuel dual swirl burner according to claim 1, wherein ​ 3. A dual fuel dual swirl burner according to claim 1, wherein ​ 4. A dual fuel dual swirl burner according to claim 1, wherein ​ 5. A dual fuel dual swirl burner according to claim 1, wherein ​ 6. A method of operating a dual-fuel dual-swirl burner as claimed in any one of claims 1 to 5, characterised in that, ​ The dual-fuel dual-swirl burner enters a set working mode according to a control command, and the set working mode includes any one of working mode one, working mode two and working mode three. In the working mode one, the gas fuel is burned alone: the gas is sprayed out through the gas pipeline and ignited after energy is applied to the ignition electrode; wherein the gas is sprayed to the center direction of the dual-swirl flame stabilizer under the action of the first gas pipeline with a certain inclination angle, the gas flowing to the center direction of the dual-swirl flame stabilizer is sucked to the upper side of the dual-swirl flame stabilizer under the action of the dual-swirl flame stabilizer, and a stable flame is formed above the dual-swirl flame stabilizer; the gas is sprayed along the axial direction of the second gas pipeline under the action of the second gas pipeline without inclination angle, so as to increase the length range of the flame; In the working mode two, the oil fuel is burned alone: the oil flows into and is atomized and sprayed out in the form of droplet spray through the oil pipeline, the droplet spray forms a stable mixing area with air under the action of the suction formed by the dual-swirl flame stabilizer, and is ignited after energy is applied to the ignition electrode; In the working mode three, the gas and oil dual-fuel is burned: first, a small amount of oil or gas fuel is introduced, and after ignition under the action of the ignition electrode, the other fuel is introduced, so that the other fuel is ignited at high temperature when one fuel is working.

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