A mixed fuel burner

Abstract

The present invention discloses a mixed fuel burner, comprising an outer tube, a preheating tube, and a fuel delivery tube. One end of the preheating tube is connected to a fuel supply device; a fan is provided at one end of the outer tube, and a tail nozzle is provided at the other end of the outer tube; a multi-stage catalytic injection device is provided in the center of the outer tube; a catalyst chamber is provided in the tail nozzle, and the other end of the preheating tube is connected to the catalyst chamber; one end of the fuel delivery tube is connected to the catalyst chamber; the multi-stage catalytic injection device includes several stages of catalytic injection components, each of which is provided with a catalyst cavity, a central heat storage body is provided in the catalyst cavity; a second catalyst is installed in the catalyst cavity; an annular gap is formed between the side of the central heat storage body and the inner wall of the catalyst cavity; a supporting connecting tube is provided between two adjacent stages of the catalytic injection components; and a thermal catalytic cover is provided around the supporting connecting tube between the two adjacent stages of the catalytic injection components. The present invention can promote the vaporization and cracking of the mixed fuel, improve the combustion efficiency of the mixed fuel, and save the use of the mixed fuel.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, in particular to a mixed fuel burner. Background Art

[0002] With technological advancements, humanity's demand for energy is growing. Adding a certain proportion of water to methanol creates a methanol-water mixed fuel, a water-based fuel. Its widespread use can alleviate the current overreliance on traditional fossil fuels and alleviate the current energy shortage. Furthermore, since methanol only produces water and carbon dioxide upon combustion, without sulfur or nitrogen compounds, it is environmentally friendly.

[0003] However, when existing burners use mixed fuels for combustion, since the mixed fuel of methanol and water is an aqueous fuel, it is in liquid form and not easy to vaporize. During the combustion process of the mixed fuel, part of the methanol cannot be fully vaporized and cracked at high temperature, which affects the combustion reaction of the methanol, resulting in incomplete combustion of the methanol, low heat generation per unit volume of the mixed fuel, and low combustion efficiency.

[0004] Therefore, it is urgent to provide a burner that can fully promote the vaporization and high-temperature cracking of the mixed fuel and improve the combustion efficiency of the mixed fuel, thereby increasing the heat generated by the combustion of the mixed fuel and saving the use of the mixed fuel. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and provide a mixed fuel burner that can fully promote the vaporization and cracking of the mixed fuel, improve the combustion efficiency of the mixed fuel, and save the use of the mixed fuel.

[0006] The objectives of the present invention are achieved through the following technical solutions: a mixed fuel burner comprising an outer tube, a preheating tube, and a fuel delivery tube, wherein the preheating tube is arranged in a multi-layered manner on the inner side of the outer tube, one end of the preheating tube is connected to a fuel supply device, and the fuel supply device provides a mixed fuel of methanol and water to the preheating tube; a fan is provided at one end of the outer tube, and a tail nozzle is provided at the other end of the outer tube; and a multi-stage catalytic injection device is provided in the center of the outer tube;

[0007] A catalyst chamber is provided in the tail nozzle, the other end of the preheating tube is connected to the catalyst chamber, and the catalyst chamber is filled with a first catalyst; one end of the fuel delivery pipe is connected to the catalyst chamber;

[0008] The multi-stage catalytic injection device includes several stages of catalytic injection components, each of which is provided with a catalyst cavity, and a central heat storage body is provided in the catalyst cavity; a second catalyst is installed in the catalyst cavity; an annular gap is formed between the side of the central heat storage body and the inner wall of the catalyst cavity; a supporting connecting pipe is provided between two adjacent stages of catalytic injection components, and the supporting connecting pipe connects the catalyst cavities in the two adjacent stages of catalytic injection components; a thermal catalytic cover is provided on the periphery of the supporting connecting pipe between the two adjacent stages of catalytic injection components, and a through hole is provided on the thermal catalytic cover; a high-temperature resistant igniter is provided in front of the annular gap of the first-stage catalytic injection component, and a plurality of support columns are provided on the last-stage catalytic injection component, and a thermal catalytic cover is provided on the periphery of the support column; the other end of the fuel delivery pipe is connected to the catalyst cavity in the first-stage catalytic injection component.

[0009] Preferably, the fan is an axial flow fan.

[0010] Preferably, a heat-insulating layer is provided on the outside of the outer cylinder.

[0011] Preferably, a water cooling pipe is provided on the outside of the thermal insulation layer, and the water cooling pipe is arranged on the outside of the thermal insulation layer in a spiral manner.

[0012] Preferably, the thermal catalytic cover is made of titanium.

[0013] Preferably, the fuel supply device includes a first fuel tank, a second fuel tank, and a fuel pump. The first fuel tank and the second fuel tank are respectively provided with a first fuel pipe and a second fuel pipe, and one end of the first fuel pipe and the second fuel pipe are connected to the input port of the fuel pump; one end of the preheating pipe is connected to the output port of the fuel pump, and the first fuel pipe and the second fuel pipe are respectively provided with a first regulating valve and a second regulating valve; the first fuel tank and the second fuel tank are respectively filled with methanol and water.

[0014] Preferably, an annular cavity and a supplementary combustion air channel are provided in the tail nozzle, and the annular cavity is located between the catalytic chamber and the outer tube; one end of the supplementary combustion air channel is connected to the annular cavity, and the supplementary combustion air channel is connected to the supplementary combustion fan through a supplementary combustion air pipe; a supplementary combustion air hole is provided on the inner side of the annular cavity.

[0015] Preferably, a plurality of grooves are provided on the side of the central heat storage body, and a heat-bending sheet is provided in the groove. The heat-bending sheet consists of a first metal layer and a second metal layer, and the first metal layer is located on the side of the second metal layer away from the bottom surface of the groove; the thermal expansion coefficient of the first metal layer is greater than the thermal expansion coefficient of the second metal layer; one end of the heat-bending sheet is fixed on the bottom surface of the groove, and the other end of the heat-bending sheet is provided with a serrated structure; when the mixed fuel burner is not burning, the heat-bending sheet is at room temperature, the heat-bending sheet is bent, and the end of the heat-bending sheet with the serrated structure extends into the annular gap; when the mixed fuel burner is in a stable combustion state, the heat-bending sheet is heated and is in a high-temperature state, the heat-bending sheet is straight and completely hidden in the groove.

[0016] Preferably, when the mixed fuel burner is in use, a first mixed fuel composed of methanol and water is first provided to the preheating tube through the fuel supply device, and the mass ratio of water in the first mixed fuel is controlled to be below 20%; the first mixed fuel passes through the preheating tube, the catalyst chamber, and the fuel delivery pipe in sequence and reaches the multi-stage catalytic injection device, the first mixed fuel first enters the catalyst cavity in the first-stage catalytic injection component, and a part of the first mixed fuel passes through the second catalyst in the second catalyst cavity and is ejected from the annular gap on the first-stage catalytic injection component, the ejected first mixed fuel is ignited by the high-temperature resistant igniter to form a jet flame, and the jet flame is ejected from the through hole on the hot catalyst cover. The first mixed fuel is ejected from the annular gap on each stage of the catalytic injection component, and the jet flame ejected from the first stage catalytic injection component ignites the first mixed fuel ejected from the subsequent stages of the catalytic injection component. Air is blown into the outer cylinder by the fan.

[0017] After the first mixed fuel has burned for 5-10 minutes, the second mixed fuel is provided to the preheating tube through the fuel supply device, and the mass ratio of methanol in the second mixed fuel is controlled at 40%-60%; at the same time, the afterburning fan is started, and the afterburning fan draws in the afterburning air. The afterburning air passes through the afterburning air pipe, the afterburning air channel, the annular cavity and the afterburning air hole in turn, and then contacts the tail jet flame in the tail jet pipe, replenishing oxygen for the tail jet flame and promoting the combustion of the tail jet flame.

[0018] The beneficial effects of the present invention are as follows: in the present invention, when the mixed fuel burner is in a stable combustion state, the first catalyst and the second catalyst are both heated to a relatively high temperature state; when the mixed fuel passes through the preheating tube, the mixed fuel in the preheating tube is preliminarily preheated, and part of the mixed fuel is vaporized by heat; then the mixed fuel enters the catalyst chamber and contacts the high-temperature first catalyst in the catalyst chamber, so that the mixed fuel is heated for a second time and further vaporized; then the mixed fuel enters the catalyst cavity in the catalytic injection component and contacts the high-temperature second catalyst in the catalyst cavity, so that the mixed fuel is heated again and fully vaporized, and The cracking of the mixed fuel is accelerated, and the methanol and water in the mixed fuel are fully converted into gaseous state. After passing through the multi-stage catalytic injection components, part of the mixed fuel is heated and vaporized in multiple stages. The vaporized mixed fuel is finally ejected from the annular gap on each catalytic injection component. After being ejected, the mixed fuel is ignited by the flame and burns. The burning mixed fuel will come into contact with the hot hot catalytic cover during the ejection process. Under the action of the hot catalytic cover, the burning methanol is fully vaporized and cracked, so that the combustion reaction is fully carried out, which greatly improves the combustion efficiency of the mixed fuel and increases the heat generated during the combustion of a unit volume of the mixed fuel, thereby saving fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of a multi-stage catalytic injection device.

[0021] Figure 3 It is a cross-sectional view of a multi-stage catalytic injection device.

[0022] Figure 4 for Figure 1 Enlarged view of part A in the middle.

[0023] Figure 5 This is a structural diagram of one direction of the central heat storage body.

[0024] Figure 6 This is a structural diagram of the central heat storage body in another direction.

[0025] Figure 7 for Figure 6 Enlarged view of part B in the middle.

[0026] Figure 8 This is a cross-sectional view of the central heat storage body at room temperature.

[0027] Figure 9 for Figure 8 Enlarged view of part D in the middle.

[0028] Figure 10Schematic diagram of the central heat storage body in a high temperature environment.

[0029] Figure: 1, outer cylinder, 2, preheating pipe, 3, fan, 4, air inlet cone, 5, insulation layer, 6, water cooling pipe, 7, first fuel tank, 8, second fuel tank, 9, first fuel pipe, 10, second fuel pipe, 11, fuel pump, 12, tail nozzle, 13, first catalyst, 14, afterburning air pipe, 15, afterburning fan, 16, fuel delivery pipe, 17, multi-stage catalytic injection device, 18, first regulating valve, 19, second regulating valve, 20 , catalytic injection components, 21, fuel interface, 22, support connecting pipe, 23, thermal catalytic cover, 24, through hole, 25, central heat storage body, 26, second catalyst, 27, annular seam, 28, high temperature resistant igniter, 29, support column, 30, supplementary combustion air channel, 31, annular cavity, 32, supplementary combustion air hole, 33, groove, 36, hot bending sheet, 37, bump, 38, serrated structure, 40, first metal layer, 41, second metal layer. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0031] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0032] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0033] like Figure 1-10As shown, a mixed fuel burner includes an outer tube 1, a preheating tube 2, and a fuel delivery tube 16. The outer tube 1 is cylindrical. The outer tube 1 is made of stainless steel. An insulation layer 5 is provided on the outside of the outer tube 2. The insulation layer 5 can be provided with multiple layers according to actual needs. In the present invention, two layers of insulation layer 5 are provided on the outside of the outer tube 2. A water cooling pipe 6 is provided on the outside of the insulation layer 5. The water cooling pipe 6 is arranged on the outside of the insulation layer 5 in a spiral manner. Both ends of the water cooling pipe 6 are connected to a cooling water circulation device, and cooling water is circulated into the water cooling pipe 6 through the cooling water circulation device, thereby cooling the outer wall of the outer tube 2.

[0034] The preheating tube 2 is arranged on the inner side of the outer tube 1 in a multi-layer surrounding manner. One end of the preheating tube 2 is connected to a fuel supply device, which provides the preheating tube with a mixed fuel of methanol and water.

[0035] A fan 3 is provided at one end of the outer tube 2, with an air inlet cone 4 located between the fan 3 and the outer tube 2. In the present invention, the fan 2 is an axial flow fan. A tail nozzle 12 is provided at the other end of the outer tube 2. A multi-stage catalytic injection device 17 is located in the center of the outer tube 2.

[0036] A catalyst chamber is provided in the tail nozzle 12, and the other end of the preheating tube 2 is connected to the catalyst chamber, in which a first catalyst 13 is installed. One end of a fuel delivery pipe 16 is connected to the catalyst chamber.

[0037] The multi-stage catalytic injection device 17 includes several stages of catalytic injection components 20. A catalyst cavity is provided in the catalytic injection component 20, and a central heat storage body 25 is provided in the catalyst cavity. The central heat storage body 25 is a solid structure. The central heat storage body 25 is made of metal material and can store heat. A protrusion 37 is provided on one side of the central heat storage body 25, and the protrusion 37 is fixedly connected to the inner wall of the catalyst cavity. The catalyst cavity is equipped with a second catalyst 26. The first catalyst 13 and the second catalyst 26 are both granular. An annular gap 27 is formed between the side of the central heat storage body 25 and the inner wall of the catalyst cavity. The width of the annular gap 27 is smaller than the particle diameter of the second catalyst 26. A high-temperature resistant igniter 28 is provided in front of the annular gap 27 of the first-stage catalytic injection component 20. The high-temperature resistant igniter 28 can generate an electric arc for igniting the mixed fuel.

[0038] A supporting connecting pipe 22 is provided between two adjacent stages of catalytic injection components 20, and the supporting connecting pipe 22 connects the catalyst cavities in the two adjacent stages of catalytic injection components. A thermal catalytic cover 23 is provided on the periphery of the supporting connecting pipe 22 between the two adjacent stages of catalytic injection components, and a through hole 24 is provided on the thermal catalytic cover 23. The thermal catalytic cover 23 is cylindrical. In the present invention, the thermal catalytic cover 23 is made of titanium. A plurality of supporting columns 29 are provided on the last stage of catalytic injection component, and a thermal catalytic cover 23 is provided on the periphery of the support column 29. The other end of the fuel delivery pipe 16 is connected to the catalyst cavity in the first stage of catalytic injection component 20. Among them, the first stage of catalytic injection component 20 is provided with a fuel interface 21 connected to the catalyst cavity, and the fuel delivery pipe 16 is connected to the fuel interface 21. In the present invention, a total of three stages of catalytic injection components 20 are provided on the multi-stage catalytic injection device 17.

[0039] The fuel supply device includes a first fuel tank 7, a second fuel tank 8, and a fuel pump 11. The first fuel tank 7 and the second fuel tank 8 are respectively provided with a first fuel pipe 9 and a second fuel pipe 10, and one end of the first fuel pipe 9 and the second fuel pipe 10 are connected to the input port of the fuel pump 11; one end of the preheating pipe 2 is connected to the output port of the fuel pump 11. The first fuel pipe 9 and the second fuel pipe 10 are respectively provided with a first regulating valve 18 and a second regulating valve 19. The first fuel tank 7 and the second fuel tank 8 are respectively filled with methanol and water. In the present invention, a mixed fuel of methanol and water is pumped into the preheating pipe 2 by the fuel pump 11, and the liquid flow in the first fuel pipe 9 and the second fuel pipe 10 is adjusted by the first regulating valve 18 and the second regulating valve 19, thereby controlling the ratio of methanol to water in the mixed fuel.

[0040] The tail nozzle 12 is provided with an annular cavity 31 and a post-combustion air passage 30. The annular cavity 31 is located between the catalyst chamber and the outer cylinder 2. One end of the post-combustion air passage 30 is connected to the annular cavity 31. The post-combustion air passage 30 is connected to the post-combustion blower 15 via the post-combustion air pipe 14. Post-combustion air holes 32 are provided inside the annular cavity 31.

[0041] When the mixed fuel burner of the present invention is used, a first mixed fuel composed of methanol and water is first provided to the preheating tube through the fuel supply device, and the mass ratio of water in the first mixed fuel is controlled to be less than 20%; the first mixed fuel passes through the preheating tube, the catalyst chamber, and the fuel delivery pipe in sequence and reaches the multi-stage catalytic injection device, the first mixed fuel first enters the catalyst cavity in the first-stage catalytic injection component, a part of the first mixed fuel passes through the second catalyst in the second catalyst cavity and is ejected from the annular gap on the first-stage catalytic injection component, the ejected first mixed fuel is ignited by the high-temperature resistant igniter to form a jet flame, and the jet flame is ejected from the through hole on the hot catalyst cover. The first mixed fuel is ejected from the annular gap on each stage of the catalytic injection component, and the jet flame ejected from the first stage catalytic injection component ignites the first mixed fuel ejected from the subsequent stages of the catalytic injection component. Air is blown into the outer cylinder by the fan.

[0042] After the first mixed fuel has burned for 5-10 minutes, the second mixed fuel is provided to the preheating tube through the fuel supply device, and the mass ratio of methanol in the second mixed fuel is controlled at 40%-60%; at the same time, the afterburning fan is started, and the afterburning fan draws in the afterburning air. The afterburning air passes through the afterburning air pipe, the afterburning air channel, the annular cavity and the afterburning air hole in turn, and then contacts the tail jet flame in the tail jet pipe, replenishing oxygen for the tail jet flame, further promoting the combustion of the tail jet flame, and increasing the temperature of the tail jet flame.

[0043] The first catalyst and the second catalyst are both metal catalytic particles. Preferably, the first catalyst and the second catalyst are metal manganese particles.

[0044] In the present invention, when the mixed fuel burner is in a stable combustion state, the first catalyst and the second catalyst are both heated to a relatively high temperature state; when the mixed fuel passes through the preheating tube, the mixed fuel in the preheating tube is preliminarily preheated, and part of the mixed fuel is vaporized by heat; then the mixed fuel enters the catalyst chamber and contacts the high-temperature first catalyst in the catalyst chamber, so that the mixed fuel is heated for the second time and further vaporized; then the mixed fuel enters the catalyst cavity in the catalytic injection component and contacts the high-temperature second catalyst in the catalyst cavity, so that the mixed fuel is heated again and fully vaporized, and the mixed fuel is The methanol and water in the mixed fuel are fully converted to a gaseous state. After passing through the multi-stage catalytic injection components, part of the mixed fuel is heated and vaporized at multiple stages. The vaporized mixed fuel is finally ejected from the annular gaps on each catalytic injection component. After being ejected, the mixed fuel is ignited by the flame and burns. During the ejection process, the burning mixed fuel contacts the hot catalytic cover. Under the action of the hot catalytic cover, the burning methanol is fully vaporized and cracked, allowing the combustion reaction to proceed fully, greatly improving the combustion efficiency of the mixed fuel and increasing the heat generated per unit volume of the mixed fuel during combustion, thereby saving fuel. The afterburning air channel, annular cavity, and afterburning air holes provided in the tail nozzle can replenish oxygen for the tail nozzle flame, further promoting the combustion reaction of the tail nozzle flame and increasing the combustion temperature. In the present invention, a central heat accumulator is provided in the catalyst chamber. The central heat accumulator has the function of accumulating heat. When the mixed fuel burner performs intermittent combustion, during the combustion interval, the central heat accumulator can release its stored heat, keeping the temperature of the second catalyst at a relatively stable state, ensuring a stable vaporization effect on the mixed fuel.

[0045] Furthermore, the side of the central heat storage body 25 is provided with a plurality of grooves 33, which are arranged in a circular array on the side of the central heat storage body 25. A heat-bending plate 36 is provided in the groove 33. The heat-bending plate 36 is composed of a first metal layer 40 and a second metal layer 41. The first metal layer 40 is located on the side of the second metal layer 41 away from the bottom surface of the groove. The thermal expansion coefficient of the first metal layer 40 is greater than the thermal expansion coefficient of the second metal layer 41. One end of the heat-bending plate 36 is fixed to the bottom surface of the groove 33, and the other end of the heat-bending plate 36 is provided with a serration structure 38. When the mixed fuel burner is not burning, the heat-bending plate 36 is at room temperature and is curved. The end of the heat-bending plate with the serration structure 38 extends into the annular gap 27. When the mixed fuel burner is in a stable combustion state, the heat-bending plate 36 is heated and is in a high-temperature state. The heat-bending plate 36 is straight and completely hidden in the groove 33.

[0046] At the initial stage of ignition, the entire mixed fuel burner is at room temperature, which is relatively low, and the mixed fuel is in liquid form. The mixed fuel sprayed out at this time is not easily ignited by the arc generated by the high-temperature resistant igniter. In order to solve the problem of difficult ignition of liquid mixed fuel, the present invention provides a heat-bending plate on the side of the central heat storage body, and provides a serrated structure at the end of the heat-bending plate. At the initial stage of ignition, one end of the heat-bending plate with the serrated structure extends into the annular gap. When the liquid mixed fuel passes through the annular gap, the mixed fuel will be sprayed onto the heat-bending plate due to the presence of the heat-bending plate. The serrated structure on the heat-bending plate can break up the mixed fuel, so that the mixed fuel forms a large number of tiny droplets, and promotes the atomization of the mixed fuel. After atomization, The mixed fuel can be easily ignited after it comes into contact with the arc generated by the high-temperature resistant igniter, thus solving the problem of difficulty in igniting the mixed fuel; after the mixed fuel burner burns for a certain period of time, the temperature of the hot bending sheet rises; since the thermal expansion coefficient of the first metal layer on the hot bending sheet is greater than the thermal expansion coefficient of the second metal layer, after the temperature of the hot bending sheet rises, the thermal expansion of the first metal layer on the hot bending sheet is greater than the thermal expansion of the second metal layer, so that the hot bending sheet will change from a bent state to a straight state, and the hot bending sheet will be completely hidden in the groove, which can reduce the resistance of the mixed fuel when it is ejected from the annular gap, and at the same time prevent the hot bending sheet from being washed by the mixed fuel for a long time, reduce the friction loss of the hot bending sheet, and increase the service life of the hot bending sheet.

[0047] The mixed fuel burner of the present invention can be used for combustion heating in scenarios such as boilers, smelting furnaces, and kilns.

[0048] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A mixed fuel burner, characterized in that: It includes an outer tube, a preheating tube, and a fuel delivery tube. The preheating tube is arranged in a multi-layered manner on the inner side of the outer tube. One end of the preheating tube is connected to a fuel supply device, which provides the preheating tube with a mixed fuel of methanol and water. A fan is provided at one end of the outer tube, and a tail nozzle is provided at the other end of the outer tube. A multi-stage catalytic injection device is provided in the center of the outer tube. A catalyst chamber is provided in the tail nozzle, the other end of the preheating tube is connected to the catalyst chamber, and the catalyst chamber is filled with a first catalyst; one end of the fuel delivery pipe is connected to the catalyst chamber; The multi-stage catalytic injection device includes several stages of catalytic injection components, each of which is provided with a catalyst cavity, and a central heat storage body is provided in the catalyst cavity; a second catalyst is installed in the catalyst cavity; an annular gap is formed between the side of the central heat storage body and the inner wall of the catalyst cavity; a supporting connecting pipe is provided between two adjacent stages of catalytic injection components, and the supporting connecting pipe connects the catalyst cavities in the two adjacent stages of catalytic injection components; a thermal catalytic cover is provided on the periphery of the supporting connecting pipe between the two adjacent stages of catalytic injection components, and a through hole is provided on the thermal catalytic cover; a high-temperature resistant igniter is provided in front of the annular gap of the first-stage catalytic injection component, and a plurality of support columns are provided on the last-stage catalytic injection component, and a thermal catalytic cover is provided on the periphery of the support column; the other end of the fuel delivery pipe is connected to the catalyst cavity in the first-stage catalytic injection component.

2. A mixed fuel burner according to claim 1, characterized in that: The fan is an axial flow fan.

3. A mixed fuel burner according to claim 1, characterized in that: The outer side of the outer cylinder is provided with a heat-insulating layer.

4. A mixed fuel burner according to claim 3, characterized in that: A water cooling pipe is provided on the outside of the thermal insulation layer, and the water cooling pipe is arranged on the outside of the thermal insulation layer in a spiral manner.

5. The mixed fuel burner according to claim 1, characterized in that: The thermal catalytic shield is made of titanium.

6. A mixed fuel burner according to any one of claims 1 to 5, characterized in that: The fuel supply device includes a first fuel tank, a second fuel tank, and a fuel pump. The first fuel tank and the second fuel tank are respectively provided with a first fuel pipe and a second fuel pipe, one end of each of the first fuel pipe and the second fuel pipe is connected to the input port of the fuel pump; one end of the preheating pipe is connected to the output port of the fuel pump, and the first fuel pipe and the second fuel pipe are respectively provided with a first regulating valve and a second regulating valve; the first fuel tank and the second fuel tank are respectively filled with methanol and water.

7. A mixed fuel burner according to claim 6, characterized in that: An annular cavity and a supplementary combustion air channel are provided in the tail nozzle, and the annular cavity is located between the catalytic chamber and the outer cylinder; one end of the supplementary combustion air channel is connected to the annular cavity, and the supplementary combustion air channel is connected to the supplementary combustion fan through the supplementary combustion air pipe; a supplementary combustion air hole is provided on the inner side of the annular cavity.

8. The mixed fuel burner according to claim 1, characterized in that: Several grooves are provided on the side of the central heat storage body, and a heat-bending sheet is provided in the groove. The heat-bending sheet consists of a first metal layer and a second metal layer, and the first metal layer is located on the side of the second metal layer away from the bottom surface of the groove; the thermal expansion coefficient of the first metal layer is greater than the thermal expansion coefficient of the second metal layer; one end of the heat-bending sheet is fixed on the bottom surface of the groove, and the other end of the heat-bending sheet is provided with a serration structure; when the mixed fuel burner is not burning, the heat-bending sheet is at room temperature, the heat-bending sheet is bent, and the end of the heat-bending sheet with the serration structure extends into the annular gap; when the mixed fuel burner is in a stable combustion state, the heat-bending sheet is heated and is in a high-temperature state, and the heat-bending sheet is straight and completely hidden in the groove.

9. The mixed fuel burner according to claim 7, characterized in that: When the mixed fuel burner is in use, a first mixed fuel composed of methanol and water is first provided to the preheating tube through the fuel supply device, and the mass ratio of water in the first mixed fuel is controlled to be below 20%; the first mixed fuel passes through the preheating tube, the catalyst chamber, and the fuel delivery pipe in sequence and reaches the multi-stage catalytic injection device, the first mixed fuel first enters the catalyst cavity in the first-stage catalytic injection component, a part of the first mixed fuel passes through the second catalyst in the second catalyst cavity and is ejected from the annular gap on the first-stage catalytic injection component, the ejected first mixed fuel is ignited by the high-temperature resistant igniter to form a jet flame, and the jet flame is ejected from the through hole on the hot catalyst cover; another part of the first mixed fuel passes through the second catalyst in the catalyst cavity and enters the second catalyst cavity in the second-stage catalytic injection component along the support connecting pipe, a part of the first mixed fuel entering the second-stage catalytic injection component is ejected from the annular gap on the second-stage catalytic injection component, and the other part enters the catalyst cavity in the next-stage catalytic injection component through the support connecting pipe; Through the above method, the first mixed fuel is ejected from the annular gaps on each stage of the catalytic injection components. The jet flame ejected from the first stage of the catalytic injection components ignites the first mixed fuel ejected from the subsequent stages of the catalytic injection components. Air is blown into the outer cylinder through the fan. After the first mixed fuel has burned for 5-10 minutes, the second mixed fuel is provided to the preheating tube through the fuel supply device, and the mass ratio of methanol in the second mixed fuel is controlled at 40%-60%; at the same time, the afterburning fan is started, and the afterburning fan draws in the afterburning air. The afterburning air passes through the afterburning air pipe, the afterburning air channel, the annular cavity and the afterburning air hole in turn, and then contacts the tail jet flame in the tail jet pipe, replenishing oxygen for the tail jet flame and promoting the full combustion of the tail jet flame.

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