Wide-working-condition multi-element diffusion flat flame burner based on additive manufacturing and using method of wide-working-condition multi-element diffusion flat flame burner

Abstract

The invention relates to a wide-working-condition multi-element diffusion flat flame burner based on additive manufacturing, and belongs to the technical field of energy power engineering, the wide-working-condition multi-element diffusion flat flame burner comprises a lower cavity and an upper cavity, and the upper cavity and the lower cavity are stacked up and down and are separated through a partition plate; the lower cavity is communicated with a fuel inlet; a plurality of fuel pipes are arranged in the upper cavity in a penetrating mode, each fuel pipe penetrates through the partition plate, the bottom end of each fuel pipe is communicated with the interior of the lower cavity, and the top end of each fuel pipe is stopped at a port of the upper cavity. The upper cavity is communicated with an oxidant inlet; wherein fuel gas enters the lower cavity from the fuel inlet, and then is transported upwards to the port of the upper cavity through the plurality of fuel pipes; oxidizing agent gas enters the upper cavity through the oxidizing agent inlet, and is upwards transported to a port of the upper cavity in a gap between the fuel pipes in the upper cavity; and the fuel gas and the oxidant gas are fully contacted at the port of the upper cavity.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy and power engineering, and specifically relates to a wide-operating-condition multi-element diffusion flat-flame burner based on additive manufacturing and a method for using the same. Background Art

[0002] The one-dimensional plane standard flame with simple flow field and uniform distribution is of great significance to the study of the combustion reaction mechanism of various gas fuels, droplet combustion, particle combustion and pollutant generation mechanism, and can realize the study of combustion reaction kinetics under highly simplified flow field. Among the many mechanism burners, the plane premixed burner, multi-element diffusion flat flame burner and counter-plane flame burner all have the advantages of producing one-dimensional, planar flame structure and good optical visibility conditions, and are widely used in the field of basic combustion research. Compared with the counter-flame with fluid stretching and the plane premixed burner with narrow operating parameters, the multi-element diffusion flat flame burner has the advantages of wide equivalence ratio adjustment range and uniform and stable combustion field, especially it can produce flame under low flow rate. At present, this burner has been widely used in the research of online laser diagnostic methods, flame synthesis preparation of nano energy materials, reaction mechanism research, particle ignition combustion mechanism, soot generation mechanism research, etc.

[0003] The existing multi-element diffusion flat flame burners commonly used at home and abroad are all processed by traditional machinery, with limited manufacturing precision, large size, complex structure, many components, low vibration resistance, and no water cooling structure. They are not suitable for some special situations such as high pressure, microgravity, and wide operating conditions. In particular, the sealing structure of the fuel chamber and the oxidant chamber is mainly completed by the sealing gasket, which has the possibility of leakage. At this time, the burner is converted from a diffusion flame to a semi-premixed or premixed flame, and there is a risk of flashback when operating under wide operating conditions.

[0004] In summary, the existing burners currently have problems such as difficult processing, complex structure, low vibration resistance, and poor sealing. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing and a method of using the same, so as to solve the problems of existing burners such as difficult processing, complex structure, low vibration resistance, and poor sealing.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention discloses a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, comprising a lower cavity and an upper cavity, wherein the upper cavity and the lower cavity are stacked up and down and separated by a partition; The lower cavity is connected to a fuel inlet; A plurality of fuel pipes are arranged through the upper cavity, each of which passes through the partition, the bottom end of each fuel pipe is connected to the interior of the lower cavity, and the top end of each fuel pipe ends at the port of the upper cavity; The upper cavity is connected to an oxidant inlet; Among them, the fuel gas enters the lower cavity from the fuel inlet and is then transported upward to the port of the upper cavity through a number of fuel pipes; The oxidant gas enters the upper chamber through the oxidant inlet and is transported upwardly through the gaps between the fuel pipes in the upper chamber to the port of the upper chamber; The fuel gas and the oxidant gas are fully in contact at the port of the upper cavity.

[0007] Preferably, the lower cavity is surrounded by the lower cylinder and the partitions and bottom plates at both ends thereof, the fuel inlet is arranged on the outer wall of the lower cylinder, and the fuel inlet is communicated with the lower cavity; The upper cavity is surrounded by the upper cylinder and the covers and partitions at both ends thereof. The oxidant inlet is arranged on the outer wall of the upper cylinder, and the oxidant inlet is communicated with the upper cavity.

[0008] Preferably, adjacent fuel pipes at the ports of the upper cavity are connected by metal fins, and a plurality of metal fins and a plurality of fuel pipes are interwoven into a mesh to form a metal honeycomb surface; Among them, honeycomb surface oxidant outlet holes are evenly arranged in the metal fins between each adjacent fuel pipe.

[0009] Optionally, the partition of the upper cylinder extends outward to form a first flange flange, and the first flange flange is provided with a plurality of upper flange connecting holes; the top end of the lower cylinder extends outward to form a second flange flange, and the second flange flange is provided with a plurality of lower flange connecting holes; the first flange flange of the upper cylinder and the second flange flange of the lower cylinder are connected by flanges.

[0010] Preferably, the outer wall of the upper cylinder is further provided with a cooling water inlet and a cooling water outlet; the cylinder wall of the upper cavity is provided with a cooling water annular channel, and the cooling water inlet and the cooling water outlet are connected through the cooling water annular channel.

[0011] Optionally, two accompanying gas inlets are provided on the outer wall of the upper cylinder, and an accompanying gas annular channel is provided in the cylinder wall of the upper cavity, and the bottom of the accompanying gas annular channel is respectively connected to the two accompanying gas inlets; the top of the accompanying gas annular channel extends upward until it ends at the port of the upper cavity.

[0012] Preferably, the cooling water annular channel includes an outer ring channel, an inner ring channel and a connecting ring channel, the outer ring channel and the inner ring channel are respectively centered around the longitudinal center line of the upper cavity, and the outer ring channel is surrounded by the outside of the inner ring channel; the connecting ring channel is higher than the cooling water inlet and the cooling water outlet, and the cooling water outlet is not at the same height as the cooling water inlet; the outer ring channel and the inner ring channel are connected through the connecting ring channel; the outer ring channel and the inner ring channel are separated by an annular partition; the outer ring channel is connected to the cooling water inlet; the inner ring channel is connected to the cooling water outlet.

[0013] Optionally, the lower cylinder and the upper cylinder are butted against each other up and down and integrally formed to form an integral cylinder; an oxidant annular channel is provided in the cylinder wall of the integral cylinder between the upper cavity and the lower cavity, and the outer wall of the integral cylinder corresponding to the lower cavity is provided with two oxidant inlets, and the two oxidant inlets are respectively located on both sides of the outer wall of the integral cylinder; six oxidant connecting ports are provided on the inner wall of the integral cylinder corresponding to the upper cavity, the six oxidant connecting ports are evenly spaced, and each oxidant connecting port is connected to the interior of the upper cavity; the two oxidant inlets are respectively connected to the oxidant annular channels; the six oxidant connecting ports are respectively connected to the oxidant annular channels.

[0014] Furthermore, a center tube is provided inside the one-piece cylinder, and the center tube passes through the bottom plate and the partition plate in sequence from bottom to top until it rises to the port of the upper cavity; a fuel pipe close to the center tube is provided with a branch pipe at the port of the upper cavity, and the fuel inlet end of the branch pipe is connected to the main pipe of the fuel pipe, and the fuel outlet end of the branch pipe is close to the center tube, so that the outlet end of the fuel pipe is evenly distributed on the end surface of the port of the upper cavity.

[0015] In a second aspect, the present invention discloses a method for using the burner, comprising: Step 1: The fuel gas enters the lower cavity from the fuel inlet, and is then transported upward to the port of the upper cavity through the fuel pipe. At the same time, the oxidant gas enters the upper cavity through the oxidant inlet, and is transported upward to the port of the upper cavity through the gap between the fuel pipes in the upper cavity. Step 2: The fuel gas and the oxidant gas fully contact at the port of the upper cavity, and burn to produce flames. The fuel gas coming out of the fuel pipe is fully surrounded by the oxidant gas, so that the flame generated by the combustion forms a stable combustion surface above the port of the upper cavity; When the temperature of the combustion stabilizing surface needs to be lowered, cooling water is introduced into the cooling water inlet, and the cooling water passes through the cooling water annular channel to lower the internal temperature of the upper cavity, thereby lowering the fuel temperature inside the fuel pipe, and finally lowering the temperature of the combustion stabilizing surface; When the temperature of the combustion stabilizing surface needs to be increased or a different flame needs to be generated in the center of the burner, solid fuel particles, liquid fuel or other fuels are introduced into the center tube. The solid fuel particles, liquid fuel or other fuels reach the top of the port of the upper cavity and burn, thereby increasing the temperature of the combustion stabilizing surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (I) The present invention discloses a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, comprising a lower cavity and an upper cavity, the upper cavity and the lower cavity are stacked up and down and separated by a partition; the lower cavity is connected to a fuel inlet; a plurality of fuel pipes are arranged throughout the upper cavity, each of which passes through a partition, the bottom end of each fuel pipe is connected to the interior of the lower cavity, and the top end of each fuel pipe ends at a port of the upper cavity; the upper cavity is connected to an oxidant inlet. The burner disclosed in the present invention is designed with only two cavities and two basic gas flow channels for fuel and oxidant, and the overall structure is simple, which solves the problem of complex structure of existing burners.

[0017] (II) The present invention discloses a detachable burner with upper and lower parts. The upper cylinder and the baffle at its bottom are made of metal additive manufacturing and are integrally formed; the lower cylinder and the bottom plate at its bottom are made of metal additive manufacturing and are integrally formed; the upper cylinder and the lower cylinder are connected by a flange. The structural parts of the burner are made of metal additive manufacturing, which reduces the difficulty of processing and solves the problem of processing difficulties in existing burners.

[0018] (III) The present invention discloses a burner with upper and lower integrated parts, which is an improvement on the burner with upper and lower separated and detachable parts. The lower cylinder and the upper cylinder are butted against each other and formed as one piece to form an integrated cylinder. The integrated cylinder is manufactured based on metal additive manufacturing, and the lower cylinder and the bottom plate are fixed by welding. This design of forming the burner into an integrated configuration not only makes the structure more compact and reduces the weight, but also improves the vibration resistance and sealing performance. It can be used in special scenarios with compact structures, such as ascending to a space station or a micro-experimental cabin.

[0019] (IV) The present invention discloses a method for using a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, wherein the fuel gas enters the lower cavity from the fuel inlet, and is then transported upward to the port of the upper cavity through a plurality of fuel pipes; the oxidant gas enters the upper cavity through the oxidant inlet, and is transported upward to the port of the upper cavity through the gaps between the fuel pipes in the upper cavity; the fuel gas and the oxidant gas are in full contact at the port of the upper cavity, and a multi-element diffusion flat flame can be obtained.

[0020] (V) The present invention discloses a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, which overcomes the defect of the existing flat flame burner having a narrow operating condition range, can be applied to a variety of operating conditions, has the characteristics of a wide operating condition, and creates basic conditions for studying particle combustion, droplet combustion and other combustion mechanisms.

[0021] (VI) The present invention discloses a wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, which overcomes the problems that the existing flat flame burners are prone to leakage and are difficult to meet the complex requirements of high pressure, microgravity, and low-carbon fuels. It aims to integrate the complex special-shaped structure of the burner matrix through additive manufacturing technology, improve manufacturing accuracy and vibration resistance, and provide a low-speed, stable, and uniform standard multi-element diffusion flat flame burner for basic research on combustion such as droplet combustion, particle combustion, soot generation mechanism, and zero-carbon fuel combustion.

[0022] In addition, the present invention also has the following advantages: 1. The present invention integrates the fuel and oxidant intake channels and designs them into a periodic honeycomb array, thereby obtaining uniformly distributed multi-element diffusion flamelets, thereby obtaining a high-temperature one-dimensional combustion field; 2. The present invention is based on a small diffusion flame, and its operating conditions are relatively wide. The fuel and oxidant can be burned under relatively wide flow rate, equivalence ratio, and dilution ratio conditions; 3. The present invention separates the fuel and the oxidant. The upper part of the burner is an integrated printed structure, which can withstand severe environments such as large vibrations, high and low temperatures, and has good sealing performance; 4. In order to cope with compact application scenarios, the burner body is printed in an integrated manner and welded to the base plate to further reduce the overall height and avoid the problem of flange sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric diagram of a wide-operating-condition multi-element diffusion flat-flame burner based on additive manufacturing provided in Example 1 of the present invention; Figure 2 is a schematic structural diagram of a cover plate provided in Example 1 of the present invention; Figure 3 is an axonometric view of the upper cylinder provided in Example 1 of the present invention; Figure 4 yes Figure 3 A cross-sectional view of Figure 5 yes Figure 3 A top view of Figure 6 is an axonometric view of the lower cylinder provided in Example 1 of the present invention; Figure 7 yes Figure 6 A cross-sectional view of Figure 8is an axonometric diagram of a wide-operating-condition multi-element diffusion flat-flame burner based on additive manufacturing provided in Example 2 of the present invention; Fig. 9 yes Figure 8 A cross-sectional view of the mid-vertical plane passing through the wake gas inlet; Fig.10 yes Figure 8 In and with Fig. 9 A cross-sectional view of another median vertical plane perpendicular to the median vertical plane; Fig.11 is an axonometric diagram of a wide-operating-condition multi-element diffusion flat-flame burner based on additive manufacturing provided in Example 3 of the present invention; Fig.12 yes Fig.11 A cross-sectional view of the mid-vertical plane of the peroxidant inlet; Fig.13 yes Fig.12 In and with Fig.11 A cross-sectional view of another median vertical plane perpendicular to the median vertical plane; Description of reference numerals: 1-lower cylinder, 10-lower cavity, 11-bottom plate; 2-upper cylinder, 20-upper cavity, 21-partition plate, 22-cover plate; 30- fuel inlet, 31- fuel pipe; 40-oxidant inlet, 41-honeycomb surface oxidant outlet; 50-cooling water inlet, 51-cooling water annular channel, 510-connecting annular channel, 511-outer ring channel, 512-inner ring channel; 52-cooling water outlet; 53-annular partition; 60-stream gas inlet, 61-stream gas annular channel; 71-first flange, 710-upper flange connection hole, 72-second flange, 720-lower flange connection hole, 730-threaded hole, 731-bolt hole; 8-metal honeycomb surface, 80-metal fins; 9-integrated cylinder, 90-oxidant annular channel; 91-central tube. DETAILED DESCRIPTION The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] Example 1: A burner with detachable upper and lower parts Embodiment 1 provides a burner with upper and lower parts that can be detached. The burner is a wide-operating-condition multi-element diffusion flat-flame burner based on additive manufacturing. The structure thereof is described in detail below in conjunction with the accompanying drawings.

[0025] refer to Figures 1 to 7 The burner comprises a lower cavity 10 and an upper cavity 20, the upper cavity 20 and the lower cavity 10 are stacked up and down and separated by a partition 21; The lower cavity 10 is connected to a fuel inlet 30; A plurality of fuel pipes 31 are disposed through the upper cavity 20, each of which passes through the partition 21, and the bottom end of each fuel pipe 31 is connected to the interior of the lower cavity 10, and the top end of each fuel pipe 31 ends at the port of the upper cavity 20; The upper cavity 20 is connected to an oxidant inlet 40; The fuel gas enters the lower cavity 10 from the fuel inlet 30 and is then transported upward to the port of the upper cavity 20 through a plurality of fuel pipes 31; The oxidant gas enters the upper cavity 20 through the oxidant inlet 40 and is transported upward through the gaps between the fuel pipes 31 in the upper cavity 20 to the port of the upper cavity 20; The fuel gas and the oxidant gas are fully in contact at the port of the upper cavity 20 .

[0026] In order to make the fuel gas flow evenly distributed, a plurality of fuel pipes 31 are evenly arranged in the upper cavity 20. Preferably, the fuel pipes 31 are arranged parallel to the longitudinal center line of the upper cavity 20.

[0027] Specifically, the lower cavity 10 is surrounded by a lower cylinder 1 and partitions 21 and a bottom plate 11 at both ends thereof, the fuel inlet 30 is arranged on the outer wall of the lower cylinder 1, and the fuel inlet 30 is communicated with the lower cavity 10; the upper cavity 20 is surrounded by an upper cylinder 2 and a cover plate 22 and a partition 21 at both ends thereof, the oxidant inlet 40 is arranged on the outer wall of the upper cylinder 2, and the oxidant inlet 40 is communicated with the upper cavity 20.

[0028] Preferably, the upper cylinder 2 and the partition plate 21 at its bottom are manufactured based on metal additive manufacturing and are integrally formed; The lower cylinder 1 and the bottom plate 11 at its bottom are made of metal additive manufacturing and are integrally formed; The upper cylinder 2 and the lower cylinder 1 are connected by flanges.

[0029] As a specific implementation of flange connection, the partition plate 21 of the upper cylinder 2 extends outward to form a first flange flange 71, and a plurality of upper flange connection holes 710 are arranged on the first flange flange 71; The top end of the lower cylinder 1 extends outward to form a second flange 72, and the second flange 72 is provided with a plurality of lower flange connection holes 720; The first flange 71 of the upper cylinder 2 and the second flange 72 of the lower cylinder 1 are connected by flanges.

[0030] For the convenience of installation, the bottom plate 11 of the upper cylinder 2 extends outward, and a plurality of burner mounting holes 110 are provided on the extended portion of the bottom plate 11 for mounting and fixing the burner.

[0031] The cover plate 22 is connected to the port of the upper cylinder 2 by bolts.

[0032] Specifically, a plurality of threaded holes 730 are provided on the cylinder wall of the port of the upper cylinder 2, and a plurality of bolt through holes 731 are correspondingly provided on the cover plate 22. A plurality of bolts respectively pass through the bolt through holes 731 of the sealing cover plate 22 and extend into the threaded holes 730 on the end face of the tube wall of the upper cavity 20, and the two are sealed and connected by bolts.

[0033] In order to make the oxidant and the fuel contact better and more fully, the adjacent fuel pipes 31 at the ports of the upper cavity 20 are connected by metal fins 80, and a plurality of metal fins 80 and a plurality of fuel pipes 31 are interwoven into a mesh to form a metal honeycomb surface 8; Honeycomb surface oxidant outlet holes 41 are evenly arranged in the metal fins 80 between each adjacent fuel pipe 31 .

[0034] It is worth mentioning that the oxidant inlet 40, the gap between the fuel pipes 31 in the upper cavity 20, and the honeycomb surface oxidant outlet holes 41 together constitute the oxidant gas flow channel.

[0035] In order to prevent the temperature of the burning flame of the metal honeycomb surface 8 from being too high, causing the burner temperature to be too high, the outer wall of the upper cylinder 2 is also provided with a cooling water inlet 50 and a cooling water outlet 52, and the cooling water outlet 52 is not at the same height as the cooling water inlet 50; A cooling water annular channel 51 is provided in the cylinder wall of the upper cavity 20 , and the cooling water inlet 50 and the cooling water outlet 52 are connected through the cooling water annular channel 51 .

[0036] It is worth mentioning that the cooling water inlet 50, the cooling water annular channel 51 and the cooling water outlet 52 together constitute a cooling water circulation channel.

[0037] Example 2: A burner with accompanying gas Embodiment 2 provides a burner with accompanying gas, which is improved on the basis of the burner of embodiment 1. The improvement is as follows: In order to ensure that the flame is not disturbed by the surrounding air, refer to Figures 8 to 10 The outer wall of the upper cylinder 2 is provided with two accompanying gas inlets 60, and the cylinder wall of the upper cavity 20 is provided with an accompanying gas annular channel 61. The bottom of the accompanying gas annular channel 61 is respectively connected to the two accompanying gas inlets 60; The top of the accompanying gas annular channel 61 extends upward until it ends at the port of the upper cavity 20 .

[0038] When nitrogen or other inert gas is introduced into the accompanying gas inlet 60, it directly reaches the port of the upper cavity 20 through the accompanying gas annular channel 61, and forms an annular flow wall around the flame on the combustion stabilization surface. Since the accompanying air inlet 60 occupies the space of the original cooling water inlet 50 , in order to ensure the cooling effect, the cooling water annular channel 51 is improved.

[0039] Continue to refer Figures 8 to 10 The cooling water annular channel 51 includes an outer ring channel 511, an inner ring channel 512 and a connecting ring channel 510. The outer ring channel 511 and the inner ring channel 512 are respectively surrounded by the longitudinal center line of the upper cavity 20, and the outer ring channel 511 is surrounded outside the inner ring channel 512; The connecting ring channel 510 is higher than the cooling water inlet 50 and the cooling water outlet 52; The outer ring channel 511 and the inner ring channel 512 are connected via a connecting ring channel 510; The outer ring channel 511 and the inner ring channel 512 are separated by an annular partition plate 53; The outer ring channel 511 is connected to the cooling water inlet 50; The inner ring channel 512 is communicated with the cooling water outlet 52 .

[0040] When cooling water enters from the cooling water inlet 50, it passes through the outer ring channel 511, the connecting ring channel 510 and the inner ring channel 512 in sequence, and finally flows out from the cooling water outlet 52. Among them, the cooling water reaches the connecting ring channel 510 from the cooling water inlet 50 and must climb over the annular partition 53 to fill the cooling water annular channel 51 and flow out from the cooling water outlet 52.

[0041] Since the length of the cooling water annular channel 51 is extended and the surface area of ​​the cooling water annular channel 51 is increased, the cooling efficiency is greatly improved.

[0042] Example 3: Upper and lower integrated burner In order to be applicable to special scenarios with compact structures, Example 3 provides a burner with an upper and lower integrated structure, which is improved on the basis of the burner in Example 1, and the improvements are as follows: refer to Figures 11 to 13 First, the upper cylinder 2 and the lower cylinder 1 are no longer connected by flanges, that is, the related structures of the first flange 71 and the second flange 72 are cancelled. Instead, the lower cylinder 1 and the upper cylinder 2 are butt-jointed up and down and formed as one piece to form an integrated cylinder 9.

[0043] Preferably, the one-piece cylinder 9 is manufactured based on metal additive manufacturing, and the lower cylinder 1 is fixed to the bottom plate 11 by welding. This integrated structural design forms an integrated configuration of the burner, which is more compact, reduces weight, improves sealing, and is suitable for special scenarios with compact structures, such as ascending to a space station or a micro-experimental cabin.

[0044] Furthermore, an oxidant annular channel 90 is provided in the cylinder wall of the integrated cylinder 9 between the upper cavity 20 and the lower cavity 10; The outer wall of the one-piece cylinder 9 corresponding to the lower cavity 10 is provided with two oxidant inlets 40, and the two oxidant inlets 40 are respectively located on both sides of the outer wall of the one-piece cylinder 9; In order to make the oxidant mix more uniform, the inner wall of the integrated cylinder 9 corresponding to the upper cavity 20 is provided with six oxidant communication ports, the six oxidant communication ports are evenly spaced, and each oxidant communication port is connected to the interior of the upper cavity 20; The two oxidant inlets 40 are respectively connected to the oxidant annular channel 90; The six oxidant communication ports are respectively connected to the oxidant annular channel 90 .

[0045] In order to increase the combustion flame temperature at the port of the upper cavity 20, a central tube 91 is provided inside the integrated cylinder 9, and the central tube 91 passes through the bottom plate 11 and the partition plate 21 from bottom to top in sequence until it rises to the port of the upper cavity 20; The fuel pipe 31 near the central pipe 91 is provided with a branch pipe at the port of the upper cavity 20, the fuel inlet end of the branch pipe is connected to the main pipe of the fuel pipe 31, and the fuel outlet end of the branch pipe is close to the central pipe 91, so that the outlet end of the fuel pipe 31 is evenly distributed on the end surface of the port of the upper cavity 20; The central tube 91 is used for introducing solid fuel particles or other fuels.

[0046] When it is necessary to study the droplets, particles, reaction gases passing through a one-dimensional flame, the droplets, particles, reaction gases, etc. to be studied can be introduced into the central tube 91 .

[0047] In addition, in order to study particle combustion, droplet combustion and other combustion mechanism studies, the central tube 91 can be introduced with corresponding solid particles (such as coal powder and combustible particles), droplets, fuel carrier gas, etc.

[0048] Embodiment 4: A method for using a burner Embodiment 4 provides a method for using a burner, using the burner of Embodiment 3, and the method comprises the following steps: Step 1: The fuel gas enters the lower cavity 10 from the fuel inlet 30, and is then transported upward to the port of the upper cavity 20 through the fuel pipe 31. At the same time, the oxidant gas enters the upper cavity 20 through the oxidant inlet 40, and is transported upward to the port of the upper cavity 20 through the gap between the fuel pipes 31 in the upper cavity 20; Step 2: The fuel gas and the oxidant gas are fully contacted at the port of the upper cavity 20, and burn to generate flames. The fuel gas coming out of the fuel pipe 31 is fully surrounded by the oxidant gas, so that the flame generated by combustion forms a stable combustion surface above the port of the upper cavity 20 .

[0049] The fuel enters the burner through the fuel inlet 30, passes through the lower cavity 10 and a plurality of fuel pipes 31, and burns on the stable combustion surface. Therefore, the fuel inlet 30, the lower cavity 10, the plurality of fuel pipes 31 and the stable combustion surface together constitute a fuel gas flow channel.

[0050] When the temperature of the combustion stabilizing surface is too high and needs to be lowered, cooling water is introduced into the cooling water inlet 50. The cooling water passes through the cooling water annular channel 51 to lower the internal temperature of the upper cavity 20, thereby lowering the fuel temperature inside the fuel pipe 31 and finally lowering the temperature of the combustion stabilizing surface.

[0051] When the temperature of the combustion stabilizing surface is too low, the temperature of the combustion stabilizing surface needs to be increased, or other combustion studies require the central tube to produce different flames, solid fuel particles, liquid fuel or other fuels are introduced into the central tube 91. The solid fuel particles, liquid fuel or other fuels reach the top of the port of the upper cavity 20 and burn, thereby increasing the temperature of the combustion stabilizing surface.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wide-operating-condition multi-element diffusion flat flame burner based on additive manufacturing, characterized in that: It comprises a lower cavity (10) and an upper cavity (20), wherein the upper cavity (20) and the lower cavity (10) are stacked one above the other and separated by a partition (21); The lower cavity (10) is connected to a fuel inlet (30); A plurality of fuel pipes (31) are arranged through the upper cavity (20), each fuel pipe (31) passes through the partition (21), the bottom end of each fuel pipe (31) is connected to the interior of the lower cavity (10), and the top end of each fuel pipe (31) ends at a port of the upper cavity (20); The upper cavity (20) is connected to an oxidant inlet (40); The fuel gas enters the lower cavity (10) from the fuel inlet (30) and is then transported upward to the port of the upper cavity (20) through a plurality of fuel pipes (31); The oxidant gas enters the upper cavity (20) through the oxidant inlet (40) and is transported upward through the gaps between the fuel pipes (31) in the upper cavity (20) to the port of the upper cavity (20); The fuel gas and the oxidant gas are in full contact at the port of the upper cavity (20).

2. The burner according to claim 1, characterized in that The lower cavity (10) is surrounded by the lower cylinder (1) and the partitions (21) and the bottom plate (11) at both ends thereof; the fuel inlet (30) is arranged on the outer wall of the lower cylinder (1), and the fuel inlet (30) is communicated with the lower cavity (10); The upper cavity (20) is surrounded by an upper cylinder (2) and cover plates (22) and partition plates (21) at both ends thereof; the oxidant inlet (40) is arranged on the outer wall of the upper cylinder (2), and the oxidant inlet (40) is communicated with the upper cavity (20).

3. The burner according to claim 2, characterized in that Adjacent fuel pipes (31) at the ports of the upper cavity (20) are connected via metal fins (80), and a plurality of metal fins (80) and a plurality of fuel pipes (31) are interwoven into a mesh to form a metal honeycomb surface (8); Honeycomb surface oxidant outlet holes (41) are evenly arranged in the metal fins (80) between each adjacent fuel pipe (31).

4. The burner according to claim 3, characterized in that The partition plate (21) of the upper cylinder (2) extends outward to form a first flange (71), and a plurality of upper flange connection holes (710) are arranged on the first flange (71); The top end of the lower cylinder (1) extends outward to form a second flange (72), and the second flange (72) is provided with a plurality of lower flange connection holes (720); The first flange (71) of the upper cylinder (2) and the second flange (72) of the lower cylinder (1) are connected via a flange.

5. The burner according to claim 3, characterized in that The outer wall of the upper cylinder (2) is also provided with a cooling water inlet (50) and a cooling water outlet (52); A cooling water annular channel (51) is provided in the cylinder wall of the upper cavity (20), and the cooling water inlet (50) and the cooling water outlet (52) are connected via the cooling water annular channel (51).

6. The burner according to claim 3, characterized in that Two accompanying gas inlets (60) are provided on the outer wall of the upper cylinder (2), and an accompanying gas annular channel (61) is provided in the cylinder wall of the upper cavity (20). The bottom of the accompanying gas annular channel (61) is respectively connected to the two accompanying gas inlets (60); The top of the accompanying gas annular channel (61) extends upward until it ends at the port of the upper cavity (20).

7. The burner according to claim 3, characterized in that The cooling water annular channel (51) comprises an outer ring channel (511), an inner ring channel (512) and a connecting ring channel (510). The outer ring channel (511) and the inner ring channel (512) are respectively surrounded by the longitudinal center line of the upper cavity (20), and the outer ring channel (511) is surrounded outside the inner ring channel (512); The connecting ring channel (510) is higher than the cooling water inlet (50) and the cooling water outlet (52), and the cooling water outlet (52) is not at the same height as the cooling water inlet (50); The outer ring channel (511) and the inner ring channel (512) are connected via a connecting ring channel (510); The outer ring channel (511) and the inner ring channel (512) are separated by an annular partition plate (53); The outer ring channel (511) is in communication with the cooling water inlet (50); The inner ring channel (512) is in communication with the cooling water outlet (52).

8. The burner according to claim 4, characterized in that The lower cylinder (1) and the upper cylinder (2) are butted against each other and integrally formed to form an integral cylinder (9); An oxidant annular channel (90) is provided in the cylinder wall of the one-piece cylinder (9) between the upper cavity (20) and the lower cavity (10). The outer wall of the one-piece cylinder (9) corresponding to the lower cavity (10) is provided with two oxidant inlets (40), and the two oxidant inlets (40) are respectively located on two sides of the outer wall of the one-piece cylinder (9); The inner wall of the integrated cylinder (9) corresponding to the upper cavity (20) is provided with six oxidant communication ports, the six oxidant communication ports are evenly spaced, and each oxidant communication port is connected to the interior of the upper cavity (20); The two oxidant inlets (40) are respectively connected to the oxidant annular channel (90); The six oxidant communication ports are respectively connected to the oxidant annular channel (90).

9. The burner according to claim 8, characterized in that A central tube (91) is provided inside the integrated cylinder (9), and the central tube (91) passes through the bottom plate (11) and the partition plate (21) in sequence from bottom to top until it rises to the port of the upper cavity (20); A fuel pipe (31) close to the central pipe (91) is provided with a branch pipe at the port of the upper cavity (20); a fuel inlet end of the branch pipe is connected to the main pipe of the fuel pipe (31); and a fuel outlet end of the branch pipe is close to the central pipe (91), so that the outlet end of the fuel pipe (31) is evenly distributed on the end surface of the port of the upper cavity (20).

10. The method for using the burner according to claim 9, characterized in that: include: Step 1: The fuel gas enters the lower cavity (10) from the fuel inlet (30), and is then transported upward to the port of the upper cavity (20) through the fuel pipe (31). At the same time, the oxidant gas enters the upper cavity (20) through the oxidant inlet (40), and is transported upward through the gap between the fuel pipes (31) in the upper cavity (20) to the port of the upper cavity (20); Step 2: The fuel gas and the oxidant gas are fully contacted at the port of the upper cavity (20) and burn to generate flames. The fuel gas coming out of the fuel pipe (31) is fully surrounded by the oxidant gas, so that the flame generated by combustion forms a stable combustion surface above the port of the upper cavity (20); When the temperature of the combustion stabilizing surface needs to be lowered, cooling water is introduced into the cooling water inlet (50), and the cooling water passes through the cooling water annular channel (51), thereby lowering the internal temperature of the upper cavity (20), thereby lowering the fuel temperature inside the fuel pipe (31), and finally lowering the temperature of the combustion stabilizing surface; When it is necessary to increase the temperature of the combustion stabilizing surface or to generate a different flame at the center of the burner, solid fuel particles, liquid fuel or other fuel are introduced into the center tube (91), and the solid fuel particles, liquid fuel or other fuel reaches the top of the port of the upper cavity (20) and burns, thereby increasing the temperature of the combustion stabilizing surface.

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