Micro-miniature non-premixed burner based on concave-convex wall structure

Abstract

The invention provides a micro-miniature non-premixing burner based on a concave-convex wall structure, and relates to the technical field of micro-scale thermo-photoelectric capability conversion, the micro-miniature non-premixing burner comprises a burner outer wall, a porous medium is arranged on the inner side of the burner outer wall, and two groups of concave-convex walls arranged in a stacked manner are mounted on the inner side of the burner outer wall; the inner portion of the burner outer wall is divided into a first air inlet channel, a second air inlet channel and an air outlet channel by the two sets of concave-convex walls, the first air inlet channel and the second air inlet channel are symmetrically arranged on the two sides of the air outlet channel, the first air inlet channel and the second air inlet channel are both communicated with the porous medium, and the porous medium is communicated with the air outlet channel. The gas outlet channel comprises a combustion chamber, a bluff body and a gas outlet which are sequentially communicated; the combustion efficiency of the combustor can be improved, the combustion stability is enhanced, the heat loss is reduced, and the high-temperature environment and uniform temperature distribution are maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-scale thermal-photoelectric energy conversion, and in particular to a micro-sized non-premixed burner based on a concave-convex wall structure. Background Art

[0002] With the development of MEMS (Micro-Electro-Mechanic Systems) technology, a large number of micro-scale and mesoscale devices have emerged in the past decade. Combustion-based micro-power systems (i.e., micro-combustion chambers) can provide a promising alternative to traditional batteries due to the higher energy density of hydrocarbon fuels to overcome the problems of short life, low energy density and long charging time of traditional batteries. In addition, compared with batteries, micro-combustion chambers can be considered more environmentally friendly because it eliminates the risk of environmental impact of battery disposal. Compared with other hydrocarbon fuels, hydrogen-fueled micro-burners have extremely high combustion speeds, so their flames can be better maintained in micro-burners.

[0003] Compared with conventional burners, microburners have the characteristics of large specific surface area, strong heat dissipation, short fuel residence time, and large pressure drop caused by friction due to their reduced volume, which directly leads to low combustion efficiency, narrow working range, and difficulty in stable combustion. The overall combustion efficiency of the microburner mainly depends on the structural design of the microburner itself. The microburner can not only reduce heat loss but also expand the stable combustion range of the microburner by effectively organizing combustion by itself. Therefore, designing and optimizing a reasonable microburner structure to achieve efficient combustion is of great significance to the application and rapid development of micro energy power systems.

[0004] There are designs using parallel plate burners in the prior art, but parallel plate burners still have some shortcomings, such as: (1) most of the prior art uses a premixed combustion mode, which has a flashback risk under low speed and high equivalence ratio conditions;

[0005] (2) The prior art achieves uniformly distributed outer wall temperature by setting a single expansion or concave cavity. However, this setting has limited improvement effect on the system. Setting multiple structures will complicate the internal structure and processing technology of the burner. At the same time, the device will fail due to uneven thermal stress between the components.

[0006] (3) The existing technology does not utilize the preheating of fuel combustion, and the flame stability in the micro burner is subject to certain limitations. Accordingly, the field urgently needs further research and improvement in this regard to better meet the higher requirements of micro burners in modern production.

[0007] (4) The fuel residence time is short. The short fuel residence time is due to the reduction of the characteristic length scale of the burner and the increase of the flow rate. As the characteristic length decreases, the high flow rate leads to a shortened fuel residence time. Especially when the residence time of the component is close to the characteristic combustion time, the incomplete combustion of the fuel leads to a decrease in heat release and an increase in heat loss. This phenomenon hinders the spontaneous combustion of the flame and may even cause the flame to go out.

[0008] Therefore, the present invention proposes a micro-sized non-premixed burner based on a concave-convex wall structure to solve the problems existing in the prior art. Summary of the invention

[0009] In view of the above problems, the purpose of the present invention is to propose a micro-sized non-premixed burner based on a concave-convex wall structure. This micro-sized non-premixed burner based on a concave-convex wall structure has the advantages of improving the combustion efficiency of the burner and solving the problems existing in the prior art.

[0010] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: a micro-sized non-premixed burner based on a concave-convex wall structure, comprising an outer wall of the burner, a porous medium is provided on the inner side of the outer wall of the burner, two groups of stacked concave-convex walls are installed on the inner side of the outer wall of the burner, the two groups of concave-convex walls divide the inner side of the outer wall of the burner into a first air inlet channel, a second air inlet channel and an air outlet channel, the first air inlet channel and the second air inlet channel are symmetrically arranged on both sides of the air outlet channel, and the first air inlet channel and the second air inlet channel are both connected to the porous medium, the porous medium is connected to the air outlet channel, and the air outlet channel includes a combustion chamber, a blunt body and an air outlet connected in sequence.

[0011] A further improvement is that a mounting seat is provided on the outer side of the outer wall of the burner, extension parts are provided on both sides of the mounting seat, and sockets are provided on the extension parts. Locking parts are installed on both sides of the outer wall of the burner, and the cross-section of the locking part is L-shaped. One end of the locking part passes through the extension part and is connected to the extension part by a fastener.

[0012] A further improvement is that a metal elastic sheet is installed on the inner side of the mounting seat, and the metal elastic sheet is in contact with the outer wall of the burner.

[0013] A further improvement is that the first air inlet channel, the second air inlet channel and the air outlet channel are arranged in parallel.

[0014] A further improvement is that the bluff body is cylindrical, and the concave-convex walls are symmetrically arranged with the axis of the bluff body as the center.

[0015] A further improvement is that the porous medium is made of Si3N4 material.

[0016] A further improvement is that the pore shape of the porous medium is one of hexagonal, triangular and circular.

[0017] A further improvement is that the pore size of the porous medium is 0.08-0.12 mm.

[0018] A further improvement is that the size of the bluff body is 0.5-0.8 mm.

[0019] A further improvement is that a catalyst is provided on the inner wall of the combustion chamber.

[0020] The beneficial effects of the present invention are as follows: the present invention is designed based on the concave-convex wall structure, so that the hydrogen fuel gas and the combustion-supporting gas entering from the first air inlet channel and the second air inlet channel respectively are mixed and burned after being fully disturbed by the porous medium, and the catalyst on the wall of the combustion chamber reduces the activation of the fuel, reduces the energy required for ignition, shortens the ignition delay time, and makes the fuel easier to ignite. The flame is anchored by the blunt body connected to the back of the combustion chamber, which increases the residence time of the flame in the combustion chamber, improves the ignition extinction limit, and widens the air intake speed of the air inlet channel, thereby improving the combustion efficiency of the burner, enhancing combustion stability, reducing heat loss, and maintaining a high temperature environment and uniform temperature distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a horizontal structural schematic diagram of the present invention.

[0023] Figure 3 It is a schematic diagram of the reflow zone and the low-speed zone formed behind the cylindrical blunt body in the present invention.

[0024] Figure 4 It is the outer wall temperature cloud diagram of the present invention.

[0025] Figure 5 It is the outer wall temperature cloud diagram of the flat-plate micro burner.

[0026] Figure 6 It is a temperature distribution curve diagram of the influence of the air intake velocity of the air intake passage of the present invention on the temperature of the outer wall of the burner.

[0027] Figure 7 It is the outer wall temperature distribution curve diagram of the present invention and the flat plate type micro burner.

[0028] Figure 8 It is a schematic diagram of the top view of the structure of the connection between the outer wall of the burner and the mounting seat of the present invention.

[0029] Fig. 9 It is a top view schematic diagram of the connection between the outer wall of the burner and the mounting seat of the present invention.

[0030] Among them: 1. first air inlet channel; 2. second air inlet channel; 3. air outlet channel; 4. outer wall of burner; 5. porous medium; 6. concave-convex wall; 7. combustion chamber; 8. blunt body; 9. air outlet; 11. catalyst; 12. mounting seat; 13. extension part; 14. locking part; 15. fastener; 16. metal elastic sheet. DETAILED DESCRIPTION

[0031] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0032] according to Figure 1-Figure 9 As shown, this embodiment proposes a miniature non-premixed burner based on a concave-convex wall structure, including a burner outer wall 4, a porous medium 5 is provided on the inner side of the burner outer wall 4, and two groups of stacked concave-convex walls 6 are installed on the inner side of the burner outer wall 4, and the two groups of concave-convex walls 6 divide the burner outer wall 4 into a first air inlet channel 1, a second air inlet channel 2 and an air outlet channel 3, the first air inlet channel 1 and the second air inlet channel 2 are symmetrically arranged on both sides of the air outlet channel 3, and the first air inlet channel 1 and the second air inlet channel 2 are both connected to the porous medium 5, and the porous medium 5 is connected to the air outlet channel 3, and the air outlet channel 3 includes a combustion chamber 7, a blunt body 8 and an air outlet 9 which are connected in sequence.

[0033] The first air inlet channel 1, the second air inlet channel 2 and the air outlet channel 3 are arranged in parallel, and the first air inlet channel 1 and the second air inlet channel 2 are respectively used for fuel gas or combustion-supporting gas to enter the outer wall 4 of the burner; when the first air inlet channel 1 is used for fuel gas to enter the outer wall 4 of the burner, the second air inlet channel 2 is used for combustion-supporting gas to enter the outer wall 4 of the burner; when the first air inlet channel 1 is used for combustion-supporting gas to enter the outer wall 4 of the burner, the second air inlet channel 2 is used for fuel gas to enter the outer wall 4 of the burner.

[0034] During operation, hydrogen fuel and combustion-supporting gas enter the outer wall 4 of the burner through the first air inlet channel 1 or the second air inlet channel 2 respectively; the hydrogen fuel and combustion-supporting gas are preheated in the first air inlet channel 1 or the second air inlet channel 2 respectively; the preheated hydrogen fuel and combustion-supporting gas are fully disturbed by the porous medium 5, and a large amount of heat generated by the combustion is transferred upstream through heat conduction and heat radiation of the solid matrix of the porous medium 5, and the fresh unburned mixed gas is preheated, and ignites and burns in the porous medium 5 or the combustion chamber 7; the flame burns stably under the catalytic action of the catalyst 11 on the wall of the combustion chamber 7 and the anchoring action of the cylindrical blunt body 8; the high-temperature gas generated by the combustion is discharged through the outlet.

[0035] By symmetrically arranging the first air inlet channel 1 and the second air inlet channel 2 on both sides of the air outlet channel 3, the combustion chamber 7 is arranged in the air outlet channel 3, which effectively reduces the heat dissipation of the outer wall, improves the combustion efficiency and enhances the stability of the combustion process.

[0036] Preferably, the fuel gas is hydrogen fuel; the combustion-supporting gas is air or oxygen.

[0037] The bluff body 8 is cylindrical, and the size of the bluff body is 0.5-0.8 mm, and in this embodiment, it is 0.8 mm.

[0038] In order to increase the stability of combustion and improve the combustion characteristics in the combustion chamber, a cylindrical blunt body 8 is designed, and a reflow zone and a low-speed zone are formed behind the blunt body 8, such as Figure 3 As shown, the recirculation zone and the low-speed zone can prolong the residence time of the chemical reaction components, which is conducive to the complete combustion of the hydrogen fuel and the stability of the flame. The cylindrical bluff body 8 can change the flow pattern of the airflow to cause circumferential flow, promote the full mixing of the hydrogen fuel and the combustion-supporting gas, improve the combustion efficiency and prolong the combustion time, so that the hydrogen fuel has more time to burn.

[0039] In this embodiment, the influence of the shape and size of the bluff body 8 on the temperature of the outer wall 4 of the burner is studied. As shown in Table 1, a triangular bluff body and a circular bluff body are selected respectively. When the bluff body size is 0.5 mm, 0.8 mm, and 1 mm, the influence of different bluff body 8 shapes and sizes on the average temperature of the outer wall 4 of the burner is measured.

[0040] Table 1 Effect of the shape and size of the bluff body on the temperature of the outer wall of the burner

[0041]

[0042] It can be seen from Table 1 that, when the size of the bluff body 8 is in the range of 0.5-0.8 mm, as the size of the bluff body 8 increases, the average temperature of the outer wall 4 of the burner provided with the triangular bluff body 8 and the circular bluff body 8 increases; in the range of 0.8-1 mm, as the size of the bluff body 8 increases, the average temperature of the outer wall 4 of the burner provided with the triangular bluff body 8 and the circular bluff body 8 decreases; when the size of the bluff body 8 is 0.8 mm, the average temperature of the outer wall 4 of the burner provided with the triangular bluff body 8 and the circular bluff body 8 is the highest; when the circular bluff body 8 is 0.8 mm in size, the average temperature of the outer wall 4 of the burner reaches 1061K at the highest.

[0043] In this embodiment, the temperature of the present invention and the flat-plate micro-combustor is compared and studied. Figure 4 and Figure 5 As shown, the temperature of the outer wall 4 of the burner in this embodiment is 400K higher than the outer wall temperature of the flat micro burner; Figure 4It can be seen that in this embodiment, the temperature of the outer wall 4 of the burner is higher from the mixture of hydrogen fuel and combustion-supporting gas to the outer wall temperature of the outlet, and the flame is anchored around the cylindrical blunt body 8, which delays the time for the flame to be blown out, prolongs the residence time of the flame, increases the ignition extinguishing limit, and widens the intake speed of the intake channel (the first intake channel 1 and the second intake channel 2).

[0044] Furthermore, the anchoring of the flame by the cylindrical blunt body 8 means that the blunt body 8 can form a certain barrier to the mixed gas, thereby causing part of the burned high-temperature combustion products to produce a reflux movement (i.e., opposite to the incoming flow direction), serving as a continuous ignition source with automatic compensation capability to continuously ignite fresh unburned combustible mixture, thereby achieving the purpose of stabilizing the flame.

[0045] The influence of the air intake speed of the first air intake channel 1 and the second air intake channel 2 on the temperature of the outer wall 4 of the burner is studied. Figure 6 As shown, within the speed range of 8 to 20 m / s, as the speed increases, the average temperature of the outer wall also increases; the peak value of the outer wall temperature moves toward the outlet direction as the speed increases. The reason is that with the increase in speed, the amount of hydrogen and air entering the combustion chamber per unit time also increases, so the temperature will also increase.

[0046] The concave-convex wall 6 is symmetrically arranged with the axis of the blunt body 8 as the center. In the present embodiment, the concave-convex wall 6 is made of stainless steel. Due to the sudden expansion effect of the concave-convex wall 6, the fuel refluxes at a low speed at the step to achieve a recycling effect, thereby optimizing the mixing and heat transfer of hydrogen and air. The heat generated in the combustion chamber 7 is transferred to the reaction starters in the intake passage through the thermal conductivity of the concave-convex wall 6, thereby increasing the initial reaction temperature, realizing super-enthalpy combustion, and thus achieving better mixing and heat transfer.

[0047] In this embodiment, the heat generated in the combustion chamber 7 can be transferred to the initial reaction materials in the air intake passage by utilizing the thermal conductivity of the concave-convex wall 6, so as to preheat the fresh gas, increase the initial reaction temperature, and reduce the ignition point, thereby achieving super enthalpy combustion. On the other hand, the air intake passage is arranged outside the air outlet passage 3, and the combustion chamber 7 is arranged on the outer wall of the air outlet passage 3, because the air intake temperature is low, the heat dissipation thereof is greatly reduced.

[0048] The outer wall temperature of the present invention and the flat plate micro burner was compared and studied. Figure 7 As shown, the present invention is used as the invention group, and the flat micro burner is used as the control group. Under the same conditions, the temperature of the outer wall 4 of the burner is monitored from the combustion chamber 7 to the air outlet 9. Figure 7It can be seen that the temperature of the flat-plate micro-burner in the combustion chamber rises slightly, and then slowly decreases along the direction of the air outlet; the temperature of the outer wall of the invention group first continues to rise, reaching a maximum temperature of 1221K near the bluff body 8, and then rapidly decreases to 1026K along the air outlet 9. Therefore, the burner of the invention group releases more heat than the flat-plate burner of the control group, and the average temperature of the outer wall is higher; compared with the flat-plate micro-burner, due to the increase in the longitudinal length of the present invention and the increase in the relative flow distance, the longitudinal heat conduction of the concave-convex wall 6 and the thermal balance of the burner as a whole are enhanced. Therefore, for small fuel photovoltaic power generation devices, the present invention is the best choice.

[0049] The porous medium 5 is made of Si3N4 material, and the pore size of the porous medium is 0.08-0.12 mm. In the present embodiment, the pore size is 0.08 mm, and the pore shape of the porous medium 5 is one of a hexagon, a triangle and a circle. Preferably, the pore shape of the porous medium 5 is a hexagon. Gas mixing is achieved through the Si3N4 porous medium, and the fuel gas and the combustion-supporting gas do not need to be premixed in advance, thereby reducing heat loss, improving combustion efficiency, and maintaining a high temperature environment and uniform temperature distribution.

[0050] In order to solve the problem of insufficient combustion caused by insufficient mixing of hydrogen and air, the present invention designs a porous medium 5 made of Si3N4 material in the burner; the porous medium 5 can premix fresh gas, and the gas is hindered by the porous medium 5, and continuously diverts and merges between the pores of the porous medium 5, and the gas is violently disturbed, generating a vortex. During the combustion process, part of the heat generated by the combustion is absorbed and transferred to the porous medium 5, and the hydrogen and air are mixed and burned in these pores. The porous medium 5 re-radiates this heat to the combustion chamber, increasing the temperature of the flame. The Si3N4 material has good heat insulation and thermal insulation properties, which can reduce heat loss during the combustion process, improve combustion efficiency, and can help maintain the high temperature environment inside the combustion chamber 7 and make the outer wall 4 of the burner reach a more uniform temperature.

[0051] The present invention studies the influence of the pore shape and pore size of the porous medium 5 on the temperature of the outer wall 4 of the burner. As shown in Table 2, hexagonal, triangular, and circular pore shapes are selected, and the influence of different pore shapes and pore sizes on the temperature of the outer wall 4 of the burner is measured under the conditions of pore sizes of 0.08 mm, 0.1 mm, and 0.12 mm, respectively.

[0052] Table 2 Effect of pore shape and pore size of porous media on the temperature of the burner outer wall

[0053]

[0054] As shown in Table 2, for the three pore shapes, as the pore size increases, the average temperature of the burner outer wall 4 decreases. When the pore size is 0.8 mm, the average temperature of the burner outer wall 4 is the highest. When the pore size of the hexagonal pore is 0.08 mm, the average temperature of the burner outer wall 4 is the highest, reaching 1385K.

[0055] The inner wall (wall surface) of the combustion chamber 7 is provided with a catalyst 11, and the loading amount of the catalyst 11 is 0.1 to 0.5 g·mol / cm 2 Preferably, the loading amount of catalyst 11 is 0.3 g·mol / cm 2 Furthermore, the catalyst 11 is a metal catalyst or silicon nitride. In the present embodiment, the catalyst 11 is silicon nitride.

[0056] Hydrogen fuel and combustion-supporting gas are not easy to burn in the combustion chamber 7 and take a long time to fully burn, which makes it easy for the hydrogen fuel to be blown out before it is completely burned; catalytic combustion can achieve efficient reaction of lean fuel at a lower temperature, and the catalyst 11 can greatly reduce the activation energy of the fuel reaction, thereby reducing the energy required for ignition; therefore, arranging the catalyst 11 on the wall of the combustion chamber 7 can make the fuel burn more fully, effectively reduce heat loss, expand the ignition limit range, and improve combustion stability.

[0057] In this embodiment, the effects of the type of catalyst 11 and the thickness of the catalyst 11 on the temperature of the combustion chamber were studied. As shown in Table 3, three catalyst 11 materials, platinum, stainless steel, and silicon nitride, were selected, and the thicknesses were set to 0.1 mm, 0.3 mm, and 0.5 mm, respectively. The effects of different catalysts 11 at different thicknesses on the combustion chamber temperature were measured.

[0058] Table 3 Effect of catalyst type and catalyst thickness on combustion chamber temperature

[0059]

[0060] As shown in Table 3, for different catalysts 11, the average temperature of the combustion chamber is the highest when the thickness is 0.3 mm. Among the three catalysts 11, the average temperature of the combustion chamber of the silicon nitride catalyst with a thickness of 0.3 mm is the highest, reaching 2332K.

[0061] Furthermore, a mounting seat 12 is provided on the outer side of the burner outer wall 4. The mounting seat 12 is used to connect with external equipment. Connecting the device to the mounting seat 12 facilitates disassembly and installation. At the same time, the mounting seat 12 can provide protection for the burner outer wall 4.

[0062] Both sides (front and back) of the mounting seat 12 are provided with extensions 13, and the extensions 13 are provided with sockets. Both sides of the burner outer wall 4 are provided with locking parts 14, the locking parts 14 are in contact with the extensions 13, and the cross section of the locking parts 14 is L-shaped. Figure 8 As shown, one end of the locking portion 14 passes through the extension portion 13 and is connected to the extension portion 13 through a fastener 15. The fastener 15 passes through the extension portion 13 and the locking portion 14 and is connected to the mounting seat 12 through a thread, which plays a role of limiting.

[0063] Furthermore, a metal elastic sheet 16 is installed on the inner side of the mounting seat 12. The metal elastic sheet 16 is in contact with the burner outer wall 4. The metal elastic sheet 16 is elastic. When the burner outer wall 4 is installed, the metal elastic sheet 16 is in a state of contraction and deformation, thereby providing a certain resistance force to improve the stability of the burner outer wall 4 after installation.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the framework and scope of application of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A miniature non-premixed burner based on a concave-convex wall structure, characterized in that: The invention comprises a burner outer wall (4), wherein a porous medium (5) is provided on the inner side of the burner outer wall (4), and two groups of stacked concave-convex walls (6) are installed on the inner side of the burner outer wall (4), wherein the two groups of concave-convex walls (6) divide the inner side of the burner outer wall (4) into a first air inlet channel (1), a second air inlet channel (2) and an air outlet channel (3), wherein the first air inlet channel (1) and the second air inlet channel (2) are symmetrically arranged on both sides of the air outlet channel (3), and the first air inlet channel (1) and the second air inlet channel (2) are both connected to the porous medium (5), and the porous medium (5) is connected to the air outlet channel (3), and the air outlet channel (3) comprises a combustion chamber (7), a bluff body (8) and an air outlet (9) which are connected in sequence.

2. A micro-sized non-premixed burner based on a concave-convex wall structure according to claim 1, characterized in that: The outer side of the burner outer wall (4) is sleeved with a mounting seat (12), both sides of the mounting seat (12) are provided with extension parts (13), and the extension parts (13) are provided with sockets, and both sides of the burner outer wall (4) are provided with locking parts (14), and the cross section of the locking parts (14) is L-shaped, and one end of the locking part (14) passes through the extension part (13) and is connected to the extension part (13) through a fastener (15).

3. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: A metal elastic sheet (16) is installed on the inner side of the mounting seat (12), and the metal elastic sheet (16) is in contact with the outer wall (4) of the burner.

4. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: The first air inlet channel (1), the second air inlet channel (2) and the air outlet channel (3) are arranged in parallel.

5. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: The bluff body (8) is cylindrical, and the concave-convex walls (6) are symmetrically arranged with the axis of the bluff body (8) as the center.

6. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: The porous medium (5) is made of Si3N4 material.

7. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: The pore shape of the porous medium (5) is one of a hexagon, a triangle and a circle.

8. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1 is characterized in that: The pore size of the porous medium (5) is 0.08-0.12 mm.

9. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1, characterized in that: The size of the bluff body (8) is 0.5-0.8 mm.

10. The micro-sized non-premixed burner based on the concave-convex wall structure according to claim 1, characterized in that: The inner wall of the combustion chamber (7) is provided with a catalyst (11).

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