Marine methanol dual-fuel staged atomization burner

Abstract

The invention discloses a marine methanol dual-fuel staged atomization burner, and relates to the technical field of heat energy engineering. Core components of the invention comprise an air bellow, a door plate assembly, a methanol valve box, a main fuel gun, an ignition gun, a swirler, a metal throat assembly and the like. The combustor controls atomization of methanol and other fuels through a flow divider and an atomizing nozzle, and stable fuel flames are achieved through a swirler. The atomizing nozzle is of a graded Y-shaped structure, the spraying holes can be adjusted according to different fuels, and different spraying requirements of fuel oil and methanol are met. The combustor is divided into three stages to support combustion through precise matching of combustion-supporting air, pipeline blowing air and a fuel inlet, and the efficient and low-pollution combustion process is ensured. Combustion-supporting air forms secondary rotational flow through the swirler, scouring of backflow smoke to the nozzle is reduced, and it is guaranteed that the core flame of the combustor is stable. The metal throat component controls the diameter of combustion flame and ensures uniform combustion.

Description

Technical Field

[0001] The invention relates to the technical field of thermal energy engineering, in particular to a marine methanol dual-fuel staged atomizing burner. Background Art

[0002] The fuel burner of the traditional auxiliary boiler adopts a steam atomization structure. Due to the low calorific value of methanol fuel (about half of fuel oil), the methanol consumption is more than twice the volume of fuel oil under the same boiler load conditions. The volume flow of the methanol burner atomizer is doubled compared with that of fuel oil, which exceeds the flow range of the fuel oil atomization nozzle. Therefore, the existing fuel oil medium atomization nozzle cannot meet the requirements of full atomization of methanol and fuel oil at the same time; the air-fuel ratio of methanol is about half of that of fuel oil, and its flame propagation speed is faster than that of fuel oil, resulting in a certain gap between the shape and size of its combustion flame and fuel oil. In a marine dual-fuel boiler, methanol and fuel oil are burned in the same boiler furnace, so the size of their combustion flames must meet the boiler furnace structure size requirements to ensure that the flame core of the fuel combustion cannot flush the inner wall of the furnace; compared with the commonly used fuel oil in marine boilers, methanol fuel has the characteristics of low flash point, easy volatility, and toxicity. Therefore, it is necessary to prevent the harm caused by methanol leakage. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a marine methanol dual-fuel staged atomizing burner, which is composed of a bellows, a door panel assembly, an inlet methanol valve box, a main fuel gun, an ignition gun, a flame detector, a metal throat assembly, a cyclone, an air sleeve assembly, a flame observation window, and a fixed pipe assembly. The main fuel gun is mainly composed of a three-wall pipe flange, a quick-connect joint, a flange, a steel pipe, a positioning ring, a diverter, a locking nut, an atomizing nozzle, a positioning sleeve, and a bent pipe; the inlet methanol valve box is mainly composed of a box body, a cover plate, a three-wall pipe matching flange, a straight pipe, an outer ring fuel inlet pipe, a fuel pipe, a quick-connect joint, an inner ring fuel inlet pipe, a double-wall pipe flange, a pipeline purge air outlet pipe, a three-way joint, a methanol fuel pipe, and a one-way valve. The main fuel gun, metal throat assembly, cyclone, air sleeve assembly, fixed pipe assembly are coaxial with the outlet cylinder of the bellows and are placed in the inner cavity of the bellows; the door panel assembly is coaxial with the outlet cylinder of the bellows and is fixed on the surface of the bellows; the door panel assembly is provided with an inlet methanol valve box, an ignition gun, a flame detector, a flame observation window, and a fixed pipe assembly. There is a certain gap between the outer wall of the atomizing nozzle and the central inner wall of the cyclone to form a DC primary air outlet; the inner wall of the metal throat assembly and the outer wall of the cyclone form a DC tertiary air outlet; the gap between the cyclone blades forms a cyclone secondary air outlet.

[0004] Preferably, the bellows housing is provided with a combustion-supporting air inlet; the ignition gun is provided with an ignition light diesel inlet; the main fuel gun is provided with an atomizing medium inlet and a pipeline purge air inlet; the inlet methanol valve box is provided with a main fuel inlet, a methanol fuel inlet and a pipeline purge air outlet.

[0005] Preferably, the combustion-supporting air inlet is connected to the bellows, the air sleeve assembly, and the metal throat assembly; the atomizing medium inlet is connected to part of the steel pipe, the diverter, and the atomizing nozzle of the main fuel gun; the pipeline purge air inlet is connected to the elbow, the straight pipe, the box, the pipeline purge air outlet pipe, and the double-wall pipe flange.

[0006] Preferably, the main fuel inlet is connected to the quick-connect joint of the methanol valve box, the fuel pipe, part of the one-way valve, the three-way joint, the inner ring fuel inlet pipe, part of the steel pipe, the diverter, and the atomizing nozzle.

[0007] Preferably, the methanol fuel inlet is connected to a three-way joint, a methanol fuel pipe, part of a one-way valve, a three-way joint, an outer ring fuel inlet pipe, an inner ring fuel inlet pipe, a three-wall pipe flange, part of a steel pipe, a diverter, and an atomizing nozzle.

[0008] Preferably, the center of the three-wall pipe flange is provided with two circles of fuel through holes, one circle of pipeline purge air through holes, and flange bolt connection holes; the three-wall pipe flange and the three-wall pipe matching flange are separated and sealed between the two circles of fuel and the pipeline purge air by three circles of O-rings.

[0009] Preferably, the ignition gun is in the form of a high-voltage electrode ignition gun for light diesel fuel, and then the atomized fuel sprayed from the atomizing nozzle is ignited. When the fuel sprayed from the atomizing nozzle is ignited, the ignition gun is extinguished, and a stable fuel flame is formed in the center of the cyclone to ensure stable combustion of the atomized fuel.

[0010] Preferably, a swirler is provided at the outlet of the atomizing nozzle, and a conical direct current intersecting primary air is formed between the central inner wall of the swirler and the outer wall of the atomizing nozzle. The primary air is beneficial to reduce the scouring of the atomizing nozzle by the high-temperature flue gas returning from the center of the atomizing nozzle, and prevent the high-temperature carbonization and blockage of the fuel in the fuel spray hole of the atomizing nozzle.

[0011] Preferably, the fuel outlet of the atomizing nozzle is located at the outlet end surface of the swirler, and the atomizing nozzle is mounted and fastened on the outlet end surface of the diverter of the main fuel gun by means of a locking nut.

[0012] Preferably, the structure of the atomizing nozzle is a graded Y-type medium atomizing nozzle structure, and two circles of atomizing medium inlet holes are provided in the center of the atomizing nozzle, the inner circle holes are connected to the hole k of the atomizing nozzle, and the outer circle holes are connected to the hole m of the atomizing nozzle.

[0013] Preferably, two circles of fuel inlet holes are provided at the end surface of the atomizing nozzle, and two inner and outer circles of fuel and atomizing medium mixing outlet holes are provided on the outer surface of the atomizing nozzle.

[0014] Preferably, when the burner burns fuel oil, fuel oil and atomizing medium are introduced into hole e of the atomizing nozzle, fuel oil and atomizing medium are introduced into hole m, and atomizing medium is introduced into hole k only; when the burner burns methanol, methanol is introduced into holes e and f of the atomizing nozzle, and methanol and atomizing medium are introduced into holes m and k. This enables methanol or fuel oil to be fully atomized and burned in the same atomizing nozzle under a large flow difference under the same heat load (the volume flow rate of methanol fuel is about twice that of fuel oil). Preferably, hole m and hole g on the atomizing nozzle are coaxial, hole m is connected to hole e and the axis angle is 50° to 65°; hole k and hole h are coaxial, hole k and hole f are connected and the axis angle is 50° to 65°; hole m and hole k are at an angle of 45° to 60° with the axis of the atomizing nozzle.

[0015] Preferably, the cyclone is an axial cyclone structure, the angle of the cyclone blades is 45° to 55°, and the number of blades is 18 to 24.

[0016] Preferably, the inner wall of the metal throat assembly is conical, and the cone angle is 20° to 30°; the distance that the outlet end face of the metal throat assembly extends from the atomizing nozzle of the main fuel gun is 10 to 20 cm.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The ship-borne methanol dual-fuel staged atomizing burner uses methanol or heavy oil as the main fuel, and is assisted by a small amount of light diesel. The methanol or heavy oil fuel atomized by the main fuel gun is ignited by the light diesel ignition gun, and a stable methanol or heavy oil combustion flame is formed at the outlet of the central swirler of the burner; when the fuel atomized by the central main fuel gun is ignited, the light diesel ignition gun stops working.

[0018] (2) Methanol fuel and combustion-supporting air are both delivered into the boiler furnace in stages. Methanol fuel is delivered in two stages through two circles of mixing holes inside and outside the atomizing nozzle, while combustion-supporting air is delivered in three stages. The high-temperature flue gas near the methanol atomizing nozzle is refluxed through the swirler and turbulently mixed with the methanol droplets sprayed from the atomizing nozzle to form a stable methanol combustion flame at the center of the burner. The turbulence intensity of the secondary swirling air is weakened by the tertiary direct air, which wraps the methanol fuel sprayed from the atomizing nozzle, helping to control the diameter of the methanol combustion flame of the main fuel gun.

[0019] (3) A swirler is provided at the outlet of the methanol atomizing nozzle. The central inner wall of the swirler forms a conical direct current intersecting primary air with the atomizing nozzle. The primary air is helpful to reduce the scouring of the fuel atomizing nozzle by the high-temperature flue gas refluxed from the center of the atomizing nozzle, and prevent the fuel in the fuel spray hole of the atomizing nozzle from being blocked by high-temperature carbonization.

[0020] (4) Through the graded medium atomizing nozzle structure, methanol or fuel oil can be fully atomized and burned in the same atomizing nozzle under the same heat load and with a large flow difference (the volume flow rate of methanol fuel is about twice that of fuel oil), so that one main oil gun can meet the needs of methanol and fuel oil at the same time, ensuring that the methanol dual-fuel burner meets the compactness requirements of marine boilers.

[0021] (5) The methanol dual-fuel burner door panel assembly is provided with an inlet methanol valve box. Through the internal pipeline and one-way valve arrangement of the inlet methanol valve box, the fuel entering the inlet methanol valve box is atomized and sprayed from the outer circle hole m of the atomizing nozzle of the main fuel gun; the methanol fuel entering the inlet methanol valve box is atomized and sprayed from the outer circle hole m and the inner circle hole k of the atomizing nozzle of the main fuel gun. In this way, the graded atomization of methanol fuel under large flow difference is achieved.

[0022] (6) The main fuel gun and the inlet addition valve box are equipped with a three-wall pipe or double-wall pipe flange structure. By continuously introducing air into the external pipe of the methanol fuel pipeline, the methanol leakage in the methanol pipeline is quickly blown to the safe area outside the cabin by the purge air in its external pipe, effectively preventing the methanol fuel entering the burner from leaking into the cabin, thereby ensuring the safety of methanol fuel supply leakage of the ship's methanol dual-fuel burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure, A-combustion-supporting air inlet; B-atomizing medium inlet; C-pipeline purge air inlet.

[0024] Figure 2 This is a schematic diagram of the internal structure of the bellows of the present invention; In the figure, D is the ignition light diesel inlet; B is the main fuel oil inlet; F is the methanol fuel inlet and pipeline purge air outlet.

[0025] Figure 3 It is a cross-sectional view of the overall structure of the present invention; In the figure, a-tertiary wind; b-secondary wind; c-primary wind.

[0026] Figure 4 It is a schematic diagram of the structure of the main fuel gun of the present invention.

[0027] Figure 5 It is a cross-sectional view of the main fuel gun of the present invention.

[0028] Figure 6 This is a front view of the three-wall pipe flange structure of the present invention.

[0029] Figure 7 It is a left sectional view of the three-wall pipe flange structure of the present invention.

[0030] Figure 8 It is a front view of the atomizing nozzle structure of the present invention.

[0031] Fig. 9 It is the left view of the atomizing nozzle structure of the present invention.

[0032] Fig.10 It is a left sectional view of the atomizing nozzle of the present invention.

[0033] Fig.11 It is an axonometric view of the atomizing nozzle of the present invention.

[0034] Fig.12 It is a front view of the inlet methanol valve box of the present invention.

[0035] Fig.13 This is a cross-sectional view of the inlet methanol valve box structure of the present invention.

[0036] Fig.14 This is a schematic diagram of the internal structure of the inlet methanol valve box of the present invention.

[0037] In the figure: 1- bellows; 2- door panel assembly; 3- inlet methanol valve box; 4- main fuel gun; 5- ignition gun; 6- flame detector; 7- metal throat assembly; 8- cyclone; 9- air sleeve assembly; 10- flame observation window; 11- fixed pipe assembly; 12- three-wall pipe flange; 13- quick connector; 14- flange; 15- steel pipe; 16- positioning ring; 17- flow divider; 18- locking nut; 19- atomizing nozzle; 20- positioning sleeve; 21- elbow; 22- box; 23- cover plate; 24- three-wall pipe matching flange; 25- straight pipe; 26- outer ring fuel inlet pipe; 27- fuel oil pipe; 28- quick connector; 29- inner ring fuel inlet pipe; 30- double wall pipe flange; 31- pipeline purge air outlet pipe; 32- three-way connector; 33- methanol fuel pipe; 34- three-way connector; 35- one-way valve. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0039] like Figure 1 to Figure 14As shown, the marine methanol dual-fuel staged atomizing burner of this embodiment mainly consists of a wind box 1, a door panel assembly 2, an inlet methanol valve box 3, a main fuel gun 4, an ignition gun 5, a flame detector 6, a metal throat assembly 7, a cyclone 8, an air sleeve assembly 9, a flame observation window 10, and a fixed pipe assembly 11. The main fuel gun 4 mainly consists of a three-wall pipe flange 12, a quick-connect joint 13, a flange 14, a steel pipe 15, a positioning ring 16, a diverter 17, a locking nut 18, an atomizing nozzle 19, a positioning sleeve 20, and a bend 21. The inlet methanol valve box 3 mainly consists of a box body 22, a cover plate 23, a three-wall pipe matching flange 24, a straight pipe 25, an outer ring fuel inlet pipe 26, a fuel oil pipe 27, a quick-connect joint 28, an inner ring fuel inlet pipe 29, a double-wall pipe flange 30, a pipeline purge air outlet pipe 31, a three-way joint 32, a methanol fuel pipe 33, a three-way joint 34, and a one-way valve 35. The main fuel gun 4, the metal throat assembly 7, the cyclone 8, the air sleeve assembly 9, and the fixed pipe assembly 11 are coaxial with the outlet cylinder of the wind box 1 and are placed in the inner cavity of the wind box 1. The door panel assembly 2 is coaxial with the outlet cylinder of the wind box 1 and is fixed on the surface of the wind box 1; the door panel assembly 2 is provided with an inlet methanol valve box 3, an ignition gun 5, a flame detector 6, a flame observation window 10, and a fixed pipe assembly 11.

[0040] A combustion-supporting air inlet A is provided on the outer shell of the wind box 1; an ignition light diesel oil inlet D is provided on the ignition gun 5; an atomizing medium inlet B and a pipeline purge air inlet C are provided on the main fuel gun 4; a main fuel oil inlet E, a methanol fuel inlet and a pipeline purge air outlet F are provided on the inlet methanol valve box 3.

[0041] The combustion-supporting air inlet A is connected to the wind box 1, the air sleeve assembly 9, and the metal throat assembly 7; the atomizing medium inlet B is connected to part of the steel pipe 15, the diverter 17, and the atomizing nozzle 19 of the main fuel gun 4; the pipeline purge air inlet C is connected to the elbow 21, the straight pipe 25, the box body 22, the pipeline purge air outlet pipe 31, and the double-wall pipe flange 30.

[0042] The main fuel inlet E is connected to the quick-connect connector 28 of the methanol valve box 3, the fuel pipe 27, part of the one-way valve 35, the three-way connector 34, the inner ring fuel inlet pipe 29, part of the steel pipe 15, the diverter 17, and the atomizing nozzle 19.

[0043] The methanol fuel inlet F is connected to the three-way joint 32, the methanol fuel pipe 33, part of the one-way valve 35, the three-way joint 34, the outer ring fuel inlet pipe 26, the inner ring fuel inlet pipe 29, the three-wall pipe flange 12, part of the steel pipe 15, the diverter 17, and the atomizing nozzle 19.

[0044] The center of the three-wall pipe flange 12 is provided with two circles of fuel through holes b and hole a, one circle of pipeline purge air through holes c, and flange bolt connection holes d; the three-wall pipe flange 12 and the three-wall pipe matching flange 24 are separated and sealed between the two circles of fuel and pipeline purge air by three circles of O-rings.

[0045] The ignition gun 5 adopts the form of a high-voltage electrode ignition gun for light diesel fuel, and then ignites the atomized fuel sprayed from the atomizing nozzle 19. When the fuel sprayed from the atomizing nozzle 19 is ignited, the ignition gun 5 is turned off, and the stable fuel flame formed at the center of the swirler 8 ensures the stable combustion of the atomized fuel. The fuel outlet of the atomizing nozzle 19 is located at the outlet end face of the swirler 8, and the atomizing nozzle 19 is installed and fastened on the outlet end face of the diverter 17 of the main fuel gun 4 through the locking nut 18. The structure of the atomizing nozzle 19 is a graded Y-type medium atomizing nozzle structure. The center of the atomizing nozzle 19 is provided with two circles of atomizing medium inlet holes, hole h and hole g. The inner circle hole h is connected to the hole k of the atomizing nozzle 19, and the outer circle hole g is connected to the hole m of the atomizing nozzle 19. Two circles of fuel inlet holes e and hole f are provided at the end face of the atomizing nozzle 19, and the outer surface of the atomizing nozzle 19 is provided with inner and outer circles of fuel and atomizing medium mixing outlet holes k and hole m. When the burner burns fuel oil, fuel oil is introduced into hole e of the atomizing nozzle 19, fuel oil and atomizing medium are introduced into hole m, and atomizing medium is introduced into hole k only; when the burner burns methanol, methanol is introduced into hole e and hole f of the atomizing nozzle 19, and methanol and atomizing medium are introduced into hole m and hole k. The hole m and hole g on the atomizing nozzle 19 are coaxial, hole m is connected with hole e, and the axis angle is 50°~65°; hole k and hole h are coaxial, hole k is connected with hole f, and the axis angle is 50°~65°; hole m and hole k are at an angle of 45°~60° with the axis of the atomizing nozzle 19. The inner wall of the metal throat assembly 7 is conical, and its cone angle is 20°~30°; the distance from the outlet end face of the metal throat assembly 7 to the atomizing nozzle 19 of the main fuel gun 4 is 10cm~20cm. After the air enters through the combustion-supporting air inlet A, it is finally divided into three levels to support combustion. The first-stage combustion-supporting air has a certain gap between the outer wall of the atomizing nozzle 19 and the central inner wall of the swirler 8 to form a direct current primary air c outlet. The primary air c is beneficial to reduce the scouring of the atomizing nozzle 19 by the high-temperature flue gas refluxed from the center of the atomizing nozzle 19, and prevent the high-temperature carbonization and blockage of the fuel in the fuel spray hole of the atomizing nozzle 19.

[0046] The second-stage combustion-supporting air forms a swirl secondary air outlet b through the gap between the blades of the swirler 8, which plays a role in stabilizing the combustion in the center. The high-temperature flue gas near the methanol or fuel atomizing nozzle 19 is refluxed through the swirler 8 and turbulently mixed with the methanol or heavy oil droplets sprayed from the atomizing nozzle 19, so as to form a stable fuel combustion flame at the center of the burner. Therefore, the swirler 8 is designed with strong swirl and adopts an axial swirl structure. The angle of its swirl blades is 45°~55°, and the number of blades is 18~24.

[0047] The third-stage combustion-supporting air forms a direct current tertiary air outlet between the inner wall of the metal throat assembly 7 and the outer wall of the cyclone 8. The turbulence intensity of the secondary swirl wind is weakened by the tertiary direct current air, which wraps the methanol fuel sprayed from the atomizing nozzle, and helps to control the diameter size of the methanol combustion flame of the main fuel gun.

Claims

1. A marine methanol dual-fuel staged atomizing burner, characterized in that: It comprises a bellows (1), a door panel assembly (2), an inlet methanol valve box (3), a main fuel gun (4), an ignition gun (5), a flame detector (6), a metal throat assembly (7), a cyclone (8), an air sleeve assembly (9), a flame observation window (10), and a fixed pipe assembly (11); wherein the main fuel gun (4) is mainly composed of a three-wall pipe flange (12), a quick-connect joint (13), a flange (14), a steel pipe (15), a positioning ring (16), a flow divider (17), a locking nut (18), an atomizing nozzle (19), a positioning sleeve (20), and a bent pipe (21); The inlet methanol valve box (3) mainly comprises a box body (22), a cover plate (23), a three-wall pipe matching flange (24), a straight pipe (25), an outer ring fuel inlet pipe (26), a fuel pipe (27), a quick-connect joint (28), an inner ring fuel inlet pipe (29), a double-wall pipe flange (30), a pipeline purge air outlet pipe (31), a three-way joint (32), a methanol fuel pipe (33), a three-way joint (34), and a one-way valve (35); The main fuel gun (4), the metal throat assembly (7), the cyclone (8), the air sleeve assembly (9), and the fixed pipe assembly (11) are coaxial with the outlet cylinder of the bellows (1) and are placed in the inner cavity of the bellows (1); the door panel assembly (2) is coaxial with the outlet cylinder of the bellows (1) and is fixed on the surface of the bellows (1); The door panel assembly (2) is provided with an inlet methanol valve box (3), an ignition gun (5), a flame detector (6), a flame observation window (10), and a fixed pipe assembly (11); a certain gap is formed between the outer wall of the atomizing nozzle (19) and the central inner wall of the cyclone (8) to form a DC primary air outlet c; a DC tertiary air outlet a is formed between the inner wall of the metal throat assembly (7) and the outer wall of the cyclone (8); and a cyclone secondary air outlet b is formed between the gaps between the blades of the cyclone (8).

2. A marine methanol dual-fuel staged atomizing burner according to claim 1, characterized in that: The wind box (1) is provided with a combustion-supporting air inlet A on its outer shell; the ignition gun (5) is provided with an ignition light diesel oil inlet D; the main fuel gun (4) is provided with an atomizing medium inlet B and a pipeline purge air inlet C; the inlet methanol valve box (3) is provided with a main fuel oil inlet E, a methanol fuel inlet and a pipeline purge air outlet F; The combustion-supporting air inlet A is connected to the wind box (1), the air sleeve assembly (9), and the metal throat assembly (7); the atomizing medium inlet B is connected to a portion of the steel pipe (15) of the main fuel gun (4), the flow divider (17), and the atomizing nozzle (19); the pipeline purge air inlet C is connected to the elbow (21), the straight pipe (25), the box (22), the pipeline purge air outlet pipe (31), and the double-wall pipe flange (30); The main fuel inlet E is connected to a quick-connect joint (28) of the methanol valve box (3), a fuel pipe (27), a portion of a one-way valve (35), a three-way joint (34), an inner ring fuel inlet pipe (29), a portion of a steel pipe (15), a flow divider (17), and an atomizing nozzle (19); The methanol fuel inlet F is connected to a three-way joint (32), a methanol fuel pipe (33), a portion of a one-way valve (35), a three-way joint (34), an outer ring fuel inlet pipe (26), an inner ring fuel inlet pipe (29), a three-wall pipe flange (12), a portion of a steel pipe (15), a flow divider (17), and an atomizing nozzle (19).

3. A marine methanol dual-fuel staged atomizing burner according to claim 2, characterized in that: The center of the three-wall pipe flange (12) is provided with two circles of fuel holes b and holes a, one circle of pipeline purge air holes c, and flange bolt connection holes d; the three-wall pipe flange (12) and the three-wall pipe matching flange (24) are separated and sealed from each other by three circles of O-rings.

4. A marine methanol dual-fuel staged atomizing burner according to claim 3, characterized in that: The ignition gun (5) is in the form of a high-voltage electrode ignition gun for light diesel fuel, and then ignites the atomized fuel sprayed from the atomizing nozzle (19). When the fuel sprayed from the atomizing nozzle (19) is ignited, the ignition gun (5) is extinguished, and a stable fuel flame is formed at the center of the cyclone (8), thereby ensuring stable combustion of the atomized fuel. A swirler (8) is provided at the outlet of the atomizing nozzle (19), and a conical direct current intersecting primary air c is formed between the central inner wall of the swirler (8) and the outer wall of the atomizing nozzle (19). The primary air is used to reduce the scouring of the atomizing nozzle (19) by the high-temperature flue gas refluxed from the center of the atomizing nozzle (19), thereby preventing the fuel in the fuel spray hole of the atomizing nozzle (19) from being carbonized and blocked by the high temperature; The fuel outlet of the atomizing nozzle (19) is located at the outlet end surface of the cyclone (8), and the atomizing nozzle (19) is mounted and fastened to the outlet end surface of the flow divider (17) of the main fuel gun (4) via a locking nut (18).

5. A marine methanol dual-fuel staged atomizing burner according to claim 4, characterized in that: The structure of the atomizing nozzle (19) is a graded Y-type medium atomizing nozzle structure. Two circles of atomizing medium inlet holes, hole h and hole g, are arranged at the center of the atomizing nozzle (19). The inner circle of holes h is connected to the hole k of the atomizing nozzle (19), and the outer circle of holes g is connected to the hole m of the atomizing nozzle (19). Two circles of fuel inlet holes e and holes f are provided at the end surface of the atomizing nozzle (19), and two inner and outer circles of fuel and atomizing medium mixing outlet holes k and holes m are provided on the outer surface of the atomizing nozzle (19); When the burner burns fuel oil, fuel oil is passed into hole e of the atomizing nozzle (19), fuel oil and atomizing medium are passed into hole m, and only atomizing medium is passed into hole k; when the burner burns methanol, methanol is passed into hole e and hole f of the atomizing nozzle (19), and methanol and atomizing medium are passed into hole m and hole k.

6. A marine methanol dual-fuel staged atomizing burner according to claim 5, characterized in that: The hole m and the hole g on the atomizing nozzle (19) are coaxial, the hole m is connected to the hole e and the axis angle is 50° to 65°; the hole k and the hole h are coaxial, the hole k and the hole f are connected and the axis angle is 50° to 65°; the hole m and the hole k are at an angle of 45° to 60° to the axis of the atomizing nozzle (19).

7. A marine methanol dual-fuel staged atomizing burner according to claim 6, characterized in that: The cyclone (8) is an axial cyclone structure, the angle of its cyclone blades is 45° to 55°, and the number of blades is 18 to 24.

8. A methanol dual-fuel staged atomizing burner for marine use according to claim 7, characterized in that: The inner wall of the metal throat assembly (7) is conical, and its cone angle is 20° to 30°; the distance between the outlet end face of the metal throat assembly (7) and the atomizing nozzle (19) of the main fuel gun (4) is 10 to 20 cm.

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