A burner

Abstract

The utility model discloses a burner, specifically relates to the technical field of combustion synthesis equipment, including the casing, metal foam board and atomizer, one side end surface of casing is provided with the mounting groove, and metal foam board fixed mounting is in the mounting groove, and the casing has independent cooling ring cavity, protective gas ring cavity and center hole, and the atomizer is fixedly connected with the casing through the center hole, and the atomizer is used for being connected with the precursor pipeline, and the gap between the outside wall of atomizer and the inner side wall of center hole forms mixed gas ring cavity, and the cooling ring cavity surrounds the metal foam board and is used for cooling the casing, and the mixed gas ring cavity and protective gas ring cavity all are communicated with the mounting groove, and the gas inlet of mixed gas ring cavity is used for being communicated with the mixed gas pipeline, and the gas inlet of protective gas ring cavity is used for being communicated with the protective gas pipeline. The utility model has excellent cooling efficiency, can effectively alleviate the risk of local thermal deformation and cracking, simultaneously improves the uniformity of flame distribution, and provides reliable guarantee for stable operation.

Description

Technical Field

[0001] This utility model relates to the field of combustion synthesis equipment technology, and in particular to a burner. Background Technology

[0002] Flame spray pyrolysis is a common technique for preparing nanoparticles. The principle involves atomizing a precursor solution containing dissolved metal salts and other raw materials, then spraying it into a high-temperature flame. Through processes such as combustion, decomposition, nucleation, and growth, nanomaterials are ultimately formed. The burner is the core device that enables this series of reactions, essentially the heart of the entire preparation system.

[0003] A fundamental flaw in traditional burners lies in their poor thermal management design, particularly uneven cooling. This leads to immense thermal stress on the burner head, causing localized thermal deformation and even cracking. This structural instability directly results in fluctuating flame morphology, affecting the consistency of synthesized nanomaterials. While some burners employ external cooling pipes to alleviate heat dissipation issues, this design suffers from long heat exchange paths and significant heat loss, resulting in low actual heat exchange efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a burner that solves the problems existing in the prior art, has excellent cooling efficiency, can effectively reduce the risk of local thermal deformation and cracking, and improves the uniformity of flame distribution, thus providing a reliable guarantee for stable operation.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a burner, including a shell, a metal foam board, and an atomizer. A mounting groove is provided on one end face of the shell, and the metal foam board is fixedly installed in the mounting groove. The shell has independent cooling annular cavity, a protective gas annular cavity, and a central hole. The atomizer passes through the central hole and is fixedly connected to the shell. The atomizer is used to connect to a precursor pipe. An annular gap between the outer wall of the atomizer and the inner wall of the central hole forms a mixed gas annular cavity. The cooling annular cavity surrounds the metal foam board and is used to cool the shell. The outlets of the mixed gas annular cavity and the protective gas annular cavity are both connected to the mounting groove. The inlet of the mixed gas annular cavity is used to connect to a mixed gas pipe, and the inlet of the protective gas annular cavity is used to connect to a protective gas pipe.

[0006] Preferably, the housing includes an upper housing and a lower housing, the upper housing and the lower housing are detachably connected, the upper housing is provided with the cooling annular cavity, and the lower housing has a protective gas annular groove on its end face near the upper housing. The protective gas annular groove surrounds the central hole, and the protective gas annular groove and the lower bottom surface of the upper housing form the protective gas annular cavity.

[0007] Preferably, the cooling ring cavity includes a water inlet and a water outlet, the water inlet being connected to a cooling water inlet pipe and the water outlet being connected to a cooling water outlet pipe.

[0008] Preferably, the upper housing includes an upper inner housing and an upper outer housing. The upper outer housing is fixedly sleeved outside the upper inner housing. An annular groove is circumferentially formed on the outer side wall of the upper inner housing. The annular groove and the inner side wall of the upper outer housing form the cooling annular cavity. The lower housing has a water inlet channel and a water outlet channel. The water inlet hole is connected to the cooling water inlet pipe through the water inlet channel, and the water outlet hole is connected to the cooling water outlet pipe through the water outlet channel.

[0009] Preferably, the upper inner shell and the upper outer shell are connected by brazing with solder, and the melting point of the solder is 700-750°C.

[0010] Preferably, the lower housing is provided with a first threaded air inlet hole communicating with the mixed gas annular cavity, and the end of the mixed gas pipe is provided with a first quick-connect fitting that connects to the first threaded air inlet hole.

[0011] Preferably, the lower housing is provided with a second threaded air inlet hole communicating with the protective gas annular cavity, and the end of the protective gas pipe is provided with a second quick-connect fitting that connects to the second threaded air inlet hole.

[0012] Preferably, the metal foam board is a copper foam board with a porosity of 55%-65% and a pore size of 0.2-0.4 mm.

[0013] The present invention achieves the following technical advantages over the prior art: This invention provides a burner in which a cooling annular cavity surrounds a metal foam plate. When the cooling medium flows through the cooling annular cavity, it can quickly absorb the heat conducted from the metal foam plate to the shell, reducing the temperature gradient at the burner head. Simultaneously, the high thermal conductivity of the metal foam plate can evenly disperse local heat sources, effectively alleviating thermal stress concentration problems, reducing the risk of deformation and cracking due to temperature differences, and significantly improving structural durability under long-term high-temperature conditions. When the methane and oxygen mixture passes through the metal foam plate from the mixed gas annular cavity, the three-dimensional interconnected pore structure of the metal foam plate forms forced turbulence, ensuring that the methane and oxygen are fully premixed before ejection, avoiding flame fluctuations caused by uneven local concentrations. At the same time, the protective gas passes through the metal foam plate from the protective gas annular cavity, forming an annular gas curtain on the outer edge of the metal foam plate, physically constraining the flame diffusion range, reducing external airflow interference, and improving the concentration and stability of the flame morphology. This ensures that the precursor is fully decomposed in a uniform high-temperature field, improving the consistency of the product particle size distribution. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the burner's structure; Figure 2 This is a structural schematic diagram of the burner from another angle; Figure 3 This is a top view of the burner; Figure 4 for Figure 3 Sectional view along the middle AA; Figure 5 for Figure 3 A sectional view along the middle edge BB; Figure 6 A schematic diagram showing the burner with the upper casing removed; Figure 7 This is a sectional view of the lower shell.

[0016] In the diagram: 1. Upper shell; 2. Lower shell; 3. Metal foam board; 4. Atomizer; 5. Center hole; 6. Cooling ring cavity; 7. Mixed gas ring cavity; 8. Protective gas ring cavity; 9. Water inlet channel; 10. Water outlet channel; 11. Protective gas inlet; 12. Mixed gas inlet; 13. Precursor pipe; 14. Upper inner shell; 15. Upper outer shell. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The purpose of this invention is to provide a burner that solves the problems existing in the prior art, has excellent cooling efficiency, can effectively reduce the risk of local thermal deformation and cracking, and improves the uniformity of flame distribution, thus providing a reliable guarantee for stable operation.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] This utility model provides a burner, such as Figures 1-7 As shown, the device includes a housing, a metal foam board 3, and an atomizer 4. A mounting groove is provided on one end face of the housing, and the metal foam board 3 is fixedly installed in the mounting groove. The housing has independent cooling annular cavity 6, protective gas annular cavity 8, and a central hole 5. The atomizer 4 passes through the central hole 5 and is fixedly connected to the housing. The atomizer 4 is used to connect to the precursor pipe 13. The annular gap between the outer wall of the atomizer 4 and the inner wall of the central hole 5 forms a mixed gas annular cavity 7. The cooling annular cavity 6 surrounds the metal foam board 3 and is used to cool the housing. The outlet of the mixed gas annular cavity 7 and the outlet of the protective gas annular cavity 8 are both connected to the mounting groove. The mixed gas inlet of the mixed gas annular cavity 7 is used to connect to a mixed gas pipe, and the protective gas inlet 11 of the protective gas annular cavity 8 is used to connect to a protective gas pipe. By arranging the cooling ring cavity 6 around the metal foam plate 3, the cooling medium flowing through it can quickly absorb the heat conducted to the shell by the metal foam plate 3, significantly reducing the temperature gradient at the burner head. At the same time, the metal foam plate 3, with its high thermal conductivity, can evenly disperse local heat sources, effectively alleviate thermal stress concentration, thereby suppressing the risk of deformation and cracking caused by temperature difference, and greatly improving the structural durability under long-term high-temperature conditions. In terms of combustion control, when the methane and oxygen mixture passes through the three-dimensional interconnected pores inside the metal foam plate 3 from the mixed gas annular cavity 7, it is subjected to forced turbulence generated by the porous structure, achieving thorough premixing and avoiding flame fluctuations caused by local uneven concentration. The mixed gas forms a stable conical flame under the disturbance of the porous plate, with temperature fluctuations ≤ ±14℃. The protective gas passes through the protective gas annular cavity 8 from the metal foam plate 3, and the protective gas ejected from the outer ring of the metal foam plate 3 forms an annular gas curtain. The annular gas curtain can keep the flame diameter stable, physically constrain the flame diffusion range, block external airflow interference, enhance the concentration and stability of the flame morphology, ensure that the precursor is fully decomposed in a uniform high-temperature field, and thus improve the consistency of the particle size distribution of the synthesized product. By achieving gas premixing through the porous structure of the metal foam plate 3 and relying on the aerodynamic constraint of the protective gas annular curtain to control the flame morphology, the entire system does not require circuit intervention for adjustment. This not only simplifies the structure and reduces manufacturing costs, but also avoids the failure risk of electronic components in high-temperature and corrosive environments, significantly improving the anti-interference capability and operational reliability of the equipment, and making it more suitable for the needs of continuous industrial production.

[0021] In a further preferred embodiment of this utility model, the housing includes an upper housing 1 and a lower housing 2, which are detachably connected. A cooling annular cavity 6 is provided inside the upper housing 1. A protective gas annular groove is formed on the end face of the lower housing 2 near the upper housing 1, surrounding a central hole 5. The protective gas annular groove and the lower bottom surface of the upper housing 1 form a protective gas annular cavity 8. The cooling annular cavity 6 is separately located in the upper housing 1, while the protective gas annular cavity 8 and the mixed gas annular cavity 7 are located in the lower housing 2. This eliminates the need to process complex annular grooves within a single housing, reducing the requirements for processing equipment and processes. The upper housing 1 and lower housing 2 are connected by bolts, facilitating disassembly, maintenance, cleaning, and repair, and extending service life. The protective gas inlet 11 of the protective gas annular cavity 8 is located on the bottom surface of the lower housing 2, and the mixed gas inlet of the mixed gas annular cavity 7 includes an oxygen inlet and a methane inlet. The oxygen inlet is located on the side wall of the lower housing 2.

[0022] In a further preferred embodiment of this invention, the cooling ring cavity 6 includes a water inlet and a water outlet. The water inlet is connected to a cooling water inlet pipe, and the water outlet is connected to a cooling water outlet pipe. By absorbing surface heat through cooling water and allowing gas to pass through the porous copper plate, the water cooling system can maintain the outer shell temperature ≤80℃ and control the thermal deformation at 0.08mm / 500h when the flame temperature rises.

[0023] In a further preferred embodiment of this utility model, the upper housing 1 includes an upper inner housing 14 and an upper outer housing 15. The upper outer housing 15 is fixedly sleeved on the upper inner housing 14. An annular groove is provided circumferentially on the outer side wall of the upper inner housing 14. The annular groove and the inner side wall of the upper outer housing 15 form a cooling annular cavity 6. The lower housing 2 has a water inlet channel 9 and a water outlet channel 10. The water inlet hole is connected to the cooling water inlet pipe through the water inlet channel 9, and the water outlet hole is connected to the cooling water outlet pipe through the water outlet channel 10. The water inlet of the water inlet channel 9 and the water outlet of the water outlet channel 10 are both located on the bottom surface of the lower housing 2.

[0024] In a further preferred embodiment of this utility model, the upper inner shell 14 and the upper outer shell 15 are connected by brazing with solder, the melting point of which is 700-750°C.

[0025] In a further preferred embodiment of this utility model, the lower housing 2 is provided with a first threaded air inlet hole communicating with the mixed gas annular cavity 7, and the end of the mixed gas pipeline is provided with a first quick-connect fitting connected to the first threaded air inlet hole. The lower housing 2 is provided with a second threaded air inlet hole communicating with the protective gas annular cavity 8, and the end of the protective gas pipeline is provided with a second quick-connect fitting connected to the second threaded air inlet hole. The quick-connect fitting requires no additional tools; the connection or disconnection of the mixed gas pipeline, the protective gas pipeline, and the housing can be completed by simply inserting and pulling the fitting. Compared with traditional flange or bolt fastening methods, this significantly shortens the pipeline connection time during installation and maintenance, making it particularly suitable for scenarios requiring frequent pipeline maintenance or replacement.

[0026] In a further preferred embodiment of this invention, the metal foam board 3 is a copper foam board with a porosity of 55%-65% and a pore size of 0.2-0.4 mm. Copper is a metal with high thermal conductivity, and the copper foam board can quickly conduct the localized high temperature generated by combustion to the entire board surface. Combined with the cooling ring cavity 6 of the shell, efficient heat dissipation is achieved, preventing the board from deforming or being damaged due to localized overheating. The porosity of 55%-65% ensures smooth gas passage without causing excessively fast airflow and insufficient residence time due to excessively large pores, or excessively large resistance and increased energy consumption due to excessively small pores, thus balancing gas flow efficiency and combustion reaction time. The pore size of 0.2-0.4 mm is considered micropores, which allow the mixed gas and protective gas to permeate the board evenly and form a dense airflow channel, preventing excessively high or low local gas concentrations and providing a stable and uniform gas source environment for combustion.

[0027] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A burner, characterized in that: The device includes a housing, a metal foam board, and an atomizer. A mounting groove is provided on one end face of the housing, and the metal foam board is fixedly installed within the mounting groove. The housing has independent cooling annular cavity, a protective gas annular cavity, and a central hole. The atomizer passes through the central hole and is fixedly connected to the housing. The atomizer is used to connect to a precursor pipe. An annular gap between the outer wall of the atomizer and the inner wall of the central hole forms a mixed gas annular cavity. The cooling annular cavity surrounds the metal foam board and is used to cool the housing. The outlets of both the mixed gas annular cavity and the protective gas annular cavity are connected to the mounting groove. The inlet of the mixed gas annular cavity is used to connect to a mixed gas pipe, and the inlet of the protective gas annular cavity is used to connect to a protective gas pipe.

2. The burner according to claim 1, characterized in that: The housing includes an upper housing and a lower housing, the upper housing and the lower housing are detachably connected, the upper housing is provided with the cooling annular cavity, and the lower housing has a protective gas annular groove on its end face near the upper housing. The protective gas annular groove surrounds the central hole, and the protective gas annular groove and the lower bottom surface of the upper housing form the protective gas annular cavity.

3. The burner according to claim 2, characterized in that: The cooling ring cavity includes a water inlet and a water outlet. The water inlet is used to connect with the cooling water inlet pipe, and the water outlet is used to connect with the cooling water outlet pipe.

4. The burner according to claim 3, characterized in that: The upper housing includes an upper inner housing and an upper outer housing. The upper outer housing is fixedly sleeved outside the upper inner housing. The outer side wall of the upper inner housing has an annular groove circumferentially formed. The annular groove and the inner side wall of the upper outer housing form the cooling annular cavity. The lower housing has a water inlet channel and a water outlet channel. The water inlet hole is connected to the cooling water inlet pipe through the water inlet channel, and the water outlet hole is connected to the cooling water outlet pipe through the water outlet channel.

5. The burner according to claim 4, characterized in that: The upper inner shell and the upper outer shell are connected by brazing with solder, the melting point of which is 700-750℃.

6. The burner according to claim 2, characterized in that: The lower housing is provided with a first threaded air inlet hole that communicates with the mixed gas annular cavity, and the end of the mixed gas pipe is provided with a first quick-connect fitting that connects to the first threaded air inlet hole.

7. The burner according to claim 2, characterized in that: The lower housing is provided with a second threaded air inlet hole that communicates with the protective gas annular cavity, and the end of the protective gas pipe is provided with a second quick-connect fitting that connects to the second threaded air inlet hole.

8. The burner according to claim 1, characterized in that: The metal foam board is a copper foam board with a porosity of 55%-65% and a pore size of 0.2-0.4 mm.

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