Mixer and burner using the same

Abstract

The present invention relates to a mixer for a burner, which comprises: a mixing tube; a gas distributor, which is constructed with an inner and outer cylindrical shape, which is located at the center of the mixing tube, and a plurality of fins arranged on its outer cylinder, which are constructed for installing the gas distributor; the gas distributor has the function of distributing combustible gas or fuel, and also has the function of distributing and regulating air flow, and the secondary air duct runs through the center of the gas distributor and the mixing tube. The present invention also relates to a burner including the above-mentioned mixer. A mixer of the present invention and a burner using the same can make the combustible gas or fuel and air mix more evenly, and couple a variety of combustion modes, thereby reducing incomplete combustion and local high temperature caused by uneven mixing of combustible gas or fuel and air and a single combustion mode, and correspondingly reducing the emission of pollutants.

Description

Technical Field

[0001] The present invention relates to the structure of industrial burners and the field of their combustion modes, and more specifically, to a mixer, which is used to mix fuel and air before combustion and has a fuel distribution function and an air distribution adjustment function. The present invention also relates to a burner including the above mixer, which is coupled with multiple combustion modes at the same time. Background Art

[0002] As is known, industrial burners are often used to provide heat, for example, by mixing combustible gas or fuel with air and then burning it to heat a specific workpiece or equipment.

[0003] However, existing burners often have undesirably high emissions, such as pollutants such as carbon monoxide and nitrogen oxides. As environmental standards increase, those skilled in the art have increasingly higher requirements for burner emissions. Therefore, there is a continuous demand for improvements to existing burners.

[0004] Therefore, it is desirable to provide an improved mixer and a burner including the mixer so that the combustible gas or fuel is more evenly mixed with the air, and the burner couples multiple combustion modes to produce less polluting gas. Summary of the invention

[0005] One object of the present invention is to provide a mixer that can make combustible gas or fuel and air mix more evenly, and the mixer has the distribution function of combustible gas or fuel and the air distribution regulation function. Another object of the present invention is to provide a burner including the above mixer, which couples multiple combustion modes.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A mixer comprising:

[0008] A mixing tube; a gas distributor, which is composed of an inner cylinder and an outer cylinder, and is located at the center of the mixing tube; and

[0009] a plurality of fins disposed on the outer cylinder, which are configured to fix the gas distributor; and

[0010] The outer cylinder has a flammable gas or fuel injection hole arranged in the circumference thereof, and a flammable gas or fuel inlet arranged in the outer cylinder; and

[0011] The inner cylinder is provided with injection holes for combustible gas or fuel in the circumferential direction.

[0012] Optionally, the inner cylinder is constructed in a waist drum shape with a middle diameter smaller than the diameters at both ends, the length of the outer cylinder is greater than the length of the inner cylinder, the outer diameter of the inner cylinder is the same as the inner diameter of the outer cylinder, and the inner cylinder is just inserted into the outer cylinder; the front end of the outer cylinder is cut into multiple uniform long strip structures.

[0013] Optionally, a tubular structure is provided at the positions of the combustible gas or fuel injection holes of the outer cylinder and the combustible gas or fuel injection holes of the inner cylinder, and the tubular structure is constructed with multiple holes symmetrically opened on both sides or multiple holes opened on one side.

[0014] A burner using the above mixer comprises:

[0015] an air input section, which includes an air inlet;

[0016] a mixing tube; a gas distributor located downstream of the air input section, and

[0017] A mixing tube comprising:

[0018] a first mixing tube and a second mixing tube; and

[0019] The gas distributor is located at a central position in the middle of the first mixing tube; and

[0020] The first mixing tube includes a first combustion face downstream thereof; and

[0021] The second mixing tube is located downstream of the injection hole of the combustible gas or fuel of the inner cylinder, and the second mixing tube includes a second combustion surface downstream thereof; the injection hole of the combustion surface is configured as a circular, square or rectangular hole, and the combustion surface is composed of a plurality of injection holes; and

[0022] One or more layers of high temperature resistant stainless steel mesh are disposed on the outer surface and the inner surface of the first mixing tube and the second mixing tube; and

[0023] The secondary air duct comprises:

[0024] The air duct is structured such that a plurality of fins are arranged at the front end and air injection holes for secondary air are arranged circumferentially at the rear end. The air duct runs through the center of the gas distributor, the first mixing tube and the second mixing tube; the position of the air injection holes for secondary air is located downstream of the second mixing tube; the fins are used to fix the air duct; and

[0025] The front end of the air duct is cut into a plurality of uniform long strip structures, and the opening of the long strip structures is adjusted to control the air flow of the secondary air; and

[0026] One or more layers of high temperature resistant stainless steel mesh are arranged on the outer surface of the air duct.

[0027] Optionally, adjusting the inward or outward opening of the long strip structure at the front end of the outer cylinder is used to adjust the flow rate of air flowing to the first mixing tube, so that the first combustion surface is in a fuel-light combustion or fuel-rich combustion state, and also the second combustion surface is in a fuel-rich combustion or fuel-light combustion state.

[0028] Optionally, the high temperature resistant stainless steel mesh arranged on the outer surfaces of the first mixing tube, the second mixing tube and the air duct is a woven mesh, a sintered mesh or a metal fiber woven mesh, and the high temperature resistant stainless steel mesh is fixed on the outer surfaces of the first mixing tube, the second mixing tube and the air duct by spot welding.

[0029] Optionally, the high temperature resistant stainless steel mesh on the inner surface of the first combustion surface and the second combustion surface is a woven mesh with a pore size greater than 80 meshes.

[0030] Optionally, the openings of the high temperature resistant stainless steel mesh on the outer surfaces of the first mixing tube and the second mixing tube are the positions of the injection holes of the first combustion surface and the injection holes of the second combustion surface, and the size and shape of the openings are the same as those of the injection holes.

[0031] Optionally, the injection holes of the first combustion surface, the injection holes of the second combustion surface and the air injection holes of the secondary air duct are provided with tubular structures, and swirl plates are provided inside the outlets of the tubular structures, and the tubular structures are straight tubes and curved tubes.

[0032] Optionally, the burner is suitable for use in a confined space, and the inner wall of the confined space is provided with one or more layers of high temperature resistant stainless steel mesh.

[0033] A mixer and a burner using the same of the present invention have the advantage of mixing combustible gas or fuel with air more evenly, and can be set to a fuel concentration combustion mode during combustion, so that it has an atmosphere for reducing nitrogen oxides, as well as secondary air burnout technology; high-temperature flue gas internal and external circulation technology, so that pollutant gas emissions are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are intended only to conceptually represent the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0035] Figure 1 It is a side cross-sectional schematic diagram of an embodiment of a mixer and a burner using the same according to the present invention.

[0036] Figure 2 It is a side view of an embodiment of the inner cylinder of the gas distributor of the present invention.

[0037] Figure 3 It is a side schematic diagram of an embodiment of the gas distributor of the present invention and the second mixing tube downstream thereof.

[0038] Figure 4 It is a side schematic diagram of an embodiment of the secondary air duct of the present invention.

[0039] Figure 5 It is a side view of an embodiment of a tubular structure with bilaterally symmetrical openings of the present invention.

[0040] Figure 6 It is a side schematic diagram of an embodiment of a tubular structure with a hole opened on one side of the present invention.

[0041] Figure 7 It is a side view of an embodiment of a swirl blade of the present invention.

[0042] Figure 8 1 is a side view of an embodiment of a straight tube of the present invention.

[0043] Fig. 9 It is a side view of an embodiment of the elbow of the present invention.

[0044] Fig.10 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same according to the present invention.

[0045] Fig.11 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same according to the present invention.

[0046] Fig.12 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same according to the present invention.

[0047] Fig.13 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same according to the present invention.

[0048] Fig.14 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same according to the present invention.

[0049] It should be pointed out that the grid-shaped shaded portion in the figure is the high-temperature resistant stainless steel mesh. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0051] First, it should be noted that the directional terms such as center position, middle, front end, rear end, upstream, downstream, etc. mentioned in this article are defined relative to the directions in the respective drawings. They are relative concepts and can therefore vary according to different positions and different practical conditions. Therefore, these or other directional terms should not be understood as restrictive terms.

[0052] In addition, it should be pointed out that any single technical feature described or implied in the embodiments of this document, or any single technical feature shown or implied in the accompanying drawings, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present invention that are not directly mentioned in this document.

[0053] It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

[0054] Figure 1 It is a schematic side cross-sectional view of an embodiment of a mixer and a burner using the same according to the present invention. The burner 100 includes: an air input section 110, which includes an air inlet 111; a mixing tube 112; a gas distributor 200, which is located downstream of the air input section 110 and is constructed by a combination of an inner cylinder and an outer cylinder, which is located at the center of the middle of the mixing tube 112, and a plurality of fins 216 arranged on the outer cylinder, which are configured to fix the gas distributor 200; and a flammable gas or fuel injection hole 210 arranged circumferentially on the outer cylinder 217, a flammable gas or fuel inlet 212 arranged on the outer cylinder 217; a plurality of uniform long strip structures 211 cut from the front end of the outer cylinder 217; and a flammable gas or fuel injection hole arranged circumferentially on the inner cylinder (for ease of reference, the inner cylinder is not shown in the figure). Figure 1 embodied in); a mixing tube, comprising: a first mixing tube 112 and a second mixing tube 215; the first mixing tube 112 comprises a first combustion surface 115 downstream thereof; the second mixing tube 215 is located downstream of the injection hole of the combustible gas or fuel of the inner cylinder, and the second mixing tube 215 comprises a second combustion surface 213 downstream thereof; in the figure, the injection hole of the combustion surface is circular, and in actual application it can also be set to a square or rectangular shape, and the combustion surface is constructed by a plurality of injection holes; and the outer surface and the inner surface of the first mixing tube 112 and the second mixing tube 215 are provided with one or more layers of high temperature resistant stainless steel mesh; a secondary air duct, comprising: an air duct 500, which is constructed with a plurality of fins at the front end (for ease of reference, the fins are not shown in the figure); Figure 1embodied in the figure), air injection holes 510 for secondary air are circumferentially arranged at the rear end, the air duct 500 runs through the center positions of the gas distributor 200, the first mixing tube 112 and the second mixing tube 215, the air injection holes 510 of the secondary air duct are located downstream of the second mixing tube 215, and the fins are used to fix the air duct 500; and the front end of the air duct 500 is cut into a plurality of uniform long strip structures 530, and adjusting the opening of the long strip structure 530 is used to control the air flow rate of the secondary air; and a high-temperature resistant stainless steel mesh 540 is arranged on the outer surface of the air duct 500.

[0055] Figure 2 The figure is a side view of an embodiment of the inner cylinder of the gas distributor of the present invention, wherein the inner cylinder 400 is constructed in a waist drum shape with a diameter in the middle smaller than that at both ends, and the inner cylinder 400 has circumferentially arranged injection holes 410 for combustible gas or fuel.

[0056] Figure 3 : is a side view of the gas distributor of the present invention and the second mixing tube downstream thereof. The gas distributor 200 includes: an outer cylinder 217, and a long strip structure 211 at its front end; a spray hole 210 for combustible gas or fuel; an inlet 212 for combustible gas or fuel; a fin 216; and a diameter-changing member 218. The second mixing tube 215 includes: a second combustion surface 213, and a high-temperature-resistant stainless steel mesh 214 arranged on its outer surface.

[0057] Figure 4 It is a side view of an embodiment of the secondary air duct of the present invention, wherein the duct 500 includes: a long strip structure 530; fins 520; air injection holes 510; and a high temperature resistant stainless steel mesh 540 arranged on its outer surface.

[0058] Optionally, adjusting the inward or outward opening of the long strip structure 211 at the front end of the outer cylinder 217 is used to adjust the amount of air flow flowing to the first mixing tube 112, so that the first combustion surface 115 is in a fuel-light combustion or fuel-rich combustion state, and at the same time, the second combustion surface 213 is in a fuel-rich combustion or fuel-light combustion state.

[0059] Optionally, the length of the outer cylinder 217 is greater than that of the inner cylinder 400, and the outer diameter of the inner cylinder 400 is the same as the inner diameter of the outer cylinder 217, so that the inner cylinder 400 can be just inserted into the outer cylinder 217 and fixed; the gas distributor 200 is connected to the second mixing tube 215 with a reducing member 218; and the high-temperature resistant stainless steel mesh 214 is fixed to the outer surface of the second mixing tube 215 by spot welding, and the high-temperature resistant stainless steel mesh 116 on the outer surface of the first mixing tube 112 and the high-temperature resistant stainless steel mesh 540 on the outer surface of the air duct 500 are fixed in the same way.

[0060] Optionally, the high temperature resistant stainless steel mesh provided on the inner surface of the first combustion surface 115 of the first mixing tube 112 and the second combustion surface 213 of the second mixing tube 215 is a woven mesh with a pore size greater than 80 meshes, and the woven mesh of the high temperature resistant stainless steel mesh provided is one layer or multiple layers.

[0061] Optionally, the openings of the high temperature resistant stainless steel mesh 116 on the outer surface of the first mixing tube 112 and the high temperature resistant stainless steel mesh 214 on the outer surface of the second mixing tube 215 are the positions of the injection holes of the first combustion surface 115 and the second combustion surface 213, and the size and shape of the openings are the same as those of the injection holes.

[0062] Optionally, the outer surfaces of the first mixing tube 112, the second mixing tube 215 and the air duct 500 are provided with one or more layers of high temperature resistant stainless steel mesh, which is a woven mesh, a sintered mesh or a metal fiber woven mesh.

[0063] Optionally, the air input section 110 includes a viewing port 113 .

[0064] Optionally, a mounting flange 114 is provided on the outer periphery of the first mixing tube 112.

[0065] During use, air is delivered from the air inlet 111 to the air input section 110 and transported and passes through the gas distributor 200, and is respectively delivered by the gas distributor 200 to the first mixing tube 112, the second mixing tube 215 and the air injection holes 510 of the secondary air duct, and the combustible gas or fuel is delivered from the combustible gas or fuel inlet 212 to the gas distributor 200, and is mixed with the air delivered to the first mixing tube 112 and the second mixing tube 215 through the combustible gas or fuel injection holes 210 of the outer cylinder 217 and the combustible gas or fuel injection holes 410 of the inner cylinder 400, and is then output and burned through the injection holes of the first combustion surface 115 and the injection holes of the second combustion surface 213.

[0066] In order to improve combustion efficiency and reduce the generation of pollutant gases, it is desired to mix the combustible gas or fuel and air evenly before combustion. It is more desired that the combustible gas mixture is further fully mixed during combustion and that there is an atmosphere in which the pollutant gases are reduced during combustion. The burner also couples multiple combustion modes to reduce the generation of pollutant gases.

[0067] Figure 5 It is a side view of an embodiment of a tubular structure with symmetrical openings on both sides of the present invention. The tubular structure 600 includes: a spray hole 610 for combustible gas or fuel.

[0068] Figure 6It is a side view of an embodiment of a tubular structure with a single-side opening of the present invention. The tubular structure 700 includes: a spray hole 710 for combustible gas or fuel.

[0069] Optionally, the tubular structure 600 and the tubular structure 700 are suitable for being arranged at the positions of the combustible gas or fuel injection holes 210 and the combustible gas or fuel injection holes 410 of the gas distributor of a large or medium-sized burner, so that the air and the combustible gas or fuel are mixed more evenly.

[0070] Figure 7 The swirl plate 800 is a side view of an embodiment of the present invention. The manufacturing method of the swirl plate 800 is: fix one end of the swirl plate with a rectangular stainless steel plate, and rotate the other end thereof to form a twist shape.

[0071] Figure 8 It is a side view of an embodiment of the straight tube of the present invention, wherein a swirl plate 800 is provided at one end of the straight tube 900 with a diameter of 900, and the swirl plate 800 is just inserted into the straight tube 900 and then fixed.

[0072] Fig. 9 1 is a side view of an embodiment of the elbow of the present invention, wherein a swirl plate 800 is provided at one end of the elbow 1000, and the swirl plate 800 is just inserted into the elbow 1000 and then fixed.

[0073] Optionally, the straight pipe 900 and the bent pipe 1000 are arranged at the injection holes of the first combustion surface 115, the injection holes of the second combustion surface 213 and the air injection holes 510 of the secondary air duct 500, and the straight pipe 900 and the bent pipe 1000 are arranged at intervals. For ease of reference, the straight pipe 900 and the bent pipe 1000 are not shown in the illustrations of a mixer and a burner using the same of the present invention.

[0074] Fig.10 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same of the present invention. Among them, the air duct 500 of the secondary air runs through the gas distributor 200, the first mixing tube 112 and the second mixing tube 215. Air and combustible gas or fuel are delivered to the gas distributor 200 for mixing, and then delivered to the downstream of the first mixing tube 112 for accumulation, and then delivered to the second mixing tube 215, and output and burn from the injection holes of the combustion surface. The second mixing tube 215 is provided with two or more combustion surfaces, and the combustion surface is composed of multiple injection holes.

[0075] Fig.11It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same of the present invention. Among them, the secondary air duct 500 runs through the gas distributor 200, the first mixing tube 112 and the second mixing tube 215. The inner wall of the pre-combustion chamber 2000 is provided with a high-temperature resistant stainless steel mesh, and a high-temperature resistant stainless steel mesh can also be provided on its periphery. The second mixing tube 215 is provided with one or more combustion surfaces, and the combustion surface is composed of multiple injection holes. It is suitable for use in equipment such as a central backfire boiler or a kiln.

[0076] Fig.12 This is a schematic side cross-sectional view of another embodiment of a mixer and a burner using the same of the present invention, wherein the second mixing tube 215 is partially perforated, the combustion surface 213 is an axially elongated strip, the combustion surface area is 10%-70% of the surface area of ​​the second mixing tube 215, and the combustion surface is composed of a plurality of injection holes. It is suitable for upward smoke exhaust equipment, downward smoke exhaust equipment or lateral smoke exhaust equipment, and the unperforated part of the second mixing tube 215 faces the direction of the smoke exhaust hole.

[0077] Fig.13 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same of the present invention. Among them, the combustion surface is a circular cone constructed of a high-temperature resistant stainless steel plate or a polyhedral cone constructed of multiple trapezoidal high-temperature resistant stainless steel plates. The secondary air duct 500 runs through the gas distributor 200 and the cone, and the outer cylinder or the inner cylinder of the gas distributor 200 extends to approximately the middle of the cone. One or more layers of high-temperature resistant stainless steel woven mesh are provided on the inner surface of the cone combustion surface. The combustion surface is composed of a plurality of injection holes.

[0078] Fig.14 It is a side cross-sectional schematic diagram of another embodiment of a mixer and a burner using the same of the present invention. Among them, the secondary air duct 500 runs through the air input section 110, the gas distributor 200, the first mixing tube 112 and the second mixing tube 215. The secondary air duct 500 is used to transport high-temperature flue gas, the high-temperature flue gas is not mixed with air, and the high-temperature flue gas remains in a state of not generating condensed water. The high-temperature flue gas is provided by a high-temperature resistant fan. It is suitable for equipment such as boilers.

[0079] Optionally, a mixer and a burner using the same are suitable for use in a confined space, and the inner wall of the confined space is provided with one or more layers of high temperature resistant stainless steel mesh.

[0080] In practical applications, a mixer and a burner using the mixer of the present invention work as follows: the air provided by the fan is input from the air inlet 111 to the air input section 110 and transported downstream, then passes through the gas distributor 200, and is uniformly mixed with the combustible gas or fuel ejected from the injection holes 210 and the injection holes 410 of the combustible gas or fuel of the gas distributor 200, and then transported to the injection holes of the downstream combustion surface for output and combustion. The combustion modes of a mixer and a burner using the mixer of the present invention include: premixed surface combustion mode at low fire or startup; premixed flameless combustion mode in a flame-off state at medium fire or high fire; as well as premixed stage combustion mode, premixed thick and thin combustion mode, premixed split flame combustion mode, mixed promotion combustion mode and premixed pre-combustion mode; as well as high temperature resistant stainless steel mesh insulation and infrared radiation technology, secondary air burnout technology and high temperature flue gas recirculation technology.

[0081] By adopting a mixer and a burner using the same according to the present invention, the mixing effect of air and combustible gas or fuel can be effectively improved, and multiple technical solutions are coupled to use less fuel during combustion and produce less polluting gas, thereby achieving true energy conservation and emission reduction.

[0082] This specification discloses the invention with reference to the accompanying drawings, and also enables a person skilled in the art to implement the invention, including making and using any device or system, selecting suitable materials, and using any combined method. The scope of the invention is defined by the claimed technical solution, and includes other examples that occur to a person skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the claimed technical solution, or such other substantially different equivalent structural elements, such other examples shall be deemed to be within the scope of protection determined by the claimed technical solution of the invention.

Claims

1. A mixer, characterized in that: The mixer comprises: A mixing tube; a gas distributor, the gas distributor being composed of an inner cylinder and an outer cylinder, and being located at the center of the mixing tube; and The inner cylinder is in the shape of a waist drum with a diameter in the middle smaller than that at both ends; the outer cylinder is longer than the inner cylinder; the outer diameter of the inner cylinder is the same as the inner diameter of the outer cylinder, and the inner cylinder is just inserted into the outer cylinder; the front end of the outer cylinder is cut into a plurality of uniform long strip structures; and A plurality of fins on the outer cylinder, which are configured to fix the gas distributor; and The outer cylinder is provided with a plurality of injection holes for combustible gas or fuel in the circumference thereof, and the outer cylinder is provided with an inlet for combustible gas or fuel; and The inner cylinder is provided with a plurality of injection holes for combustible gas or fuel in the circumferential direction; and The mixer is characterized in that a tubular structure is arranged at the positions of the injection holes of the combustible gas or fuel of the outer cylinder and the injection holes of the combustible gas or fuel of the inner cylinder, and the tubular structure has multiple holes symmetrically opened on both sides or multiple holes opened on one side.

2. A burner using the mixer as claimed in claim 1, characterized in that: It includes: an air input section including an air inlet; as well as The mixing tube; The gas distributor is located downstream of the air input section; as well as The mixing tube comprises: a first mixing tube and a second mixing tube; and The gas distributor is located at a central position in the middle of the first mixing tube; and The first mixing tube includes a first combustion face downstream thereof; and The second mixing tube is located downstream of the injection hole of the combustible gas or fuel of the inner cylinder, and the second mixing tube includes a second combustion surface downstream thereof; the injection hole of the combustion surface is configured in a circular, square or rectangular shape, and the combustion surface is composed of a plurality of the injection holes; and The outer surface and the inner surface of the first mixing tube and the second mixing tube are both provided with one or more layers of high temperature resistant stainless steel mesh; The secondary air duct comprises: An air duct, which is structured to have a plurality of fins at the front end and a plurality of secondary air injection holes circumferentially arranged at the rear end, the air duct being connected through the center of the gas distributor, the first mixing tube and the second mixing tube; the secondary air injection holes being located downstream of the second mixing tube; the fins being used to fix the air duct; and The front end of the air duct is cut into a plurality of uniform long strip structures, and the opening of the long strip structures is adjusted to control the air flow of the secondary air; and One or more layers of the high temperature resistant stainless steel mesh are arranged on the outer surface of the air duct.

3. The burner according to claim 2, characterized in that: Adjusting the inward or outward opening of the long strip structure at the front end of the outer cylinder is used to adjust the flow rate of air flowing to the first mixing tube, so that the first combustion surface is in a fuel-light combustion or fuel-rich combustion state, and at the same time, the second combustion surface is in a fuel-rich combustion or fuel-light combustion state.

4. The burner according to claim 2, characterized in that: The high temperature resistant stainless steel mesh arranged on the outer surfaces of the first mixing tube, the second mixing tube and the air duct is a woven mesh, a sintered mesh or a metal fiber woven mesh, and the high temperature resistant stainless steel mesh is fixed to the outer surfaces of the first mixing tube, the second mixing tube and the air duct by spot welding.

5. The burner according to claim 2, characterized in that: The high temperature resistant stainless steel mesh on the inner surface of the first combustion surface and the second combustion surface is a woven mesh with a pore size greater than 80 meshes.

6. The burner according to claim 2, characterized in that The openings of the high temperature resistant stainless steel mesh on the outer surfaces of the first mixing tube and the second mixing tube are the positions of the injection holes of the first combustion surface and the injection holes of the second combustion surface, and the size and shape of the openings are the same as those of the injection holes.

7. The burner according to claim 2, characterized in that The injection holes of the first combustion surface, the injection holes of the second combustion surface and the air injection holes of the secondary air duct are provided with tubular structures, and swirl sheets are provided inside the outlets of the tubular structures. The tubular structures are straight tubes and curved tubes.

8. The burner according to any one of claims 2, 4, 5, 6 or 7, characterized in that: The burner is suitable for use in a restricted space, and the inner wall of the restricted space is provided with one or more layers of the high-temperature resistant stainless steel mesh.

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