System and method for continuous flame synthesis of carbon-based nano material

Abstract

The invention discloses a system and a method for continuous flame synthesis of a carbon-based nano material. The system comprises a flame platform, a catalytic base material supporting device, a cooling water supply device and an inert gas / reducing gas supply device, the flame platform is in an open ring shape, a plurality of combustion nozzles are evenly installed on the flame platform, and the inert gas / reducing gas supply device is located at an opening of the flame platform. The catalytic base material supporting device comprises a supporting shaft and a plurality of connecting rods; a cooling water channel is arranged in the supporting shaft, the connecting rod and the catalytic base material fixing plate; the flame platform with the annular opening is arranged to provide a uniform temperature field for the synthesis process of the nano material, and the synthesis time of the nano material and the material is adjusted by flexibly adjusting the distance between the catalytic base material and the nozzle and adjusting the rotating speed of the catalytic base material; stable and uniform growth conditions are provided for large-scale synthesis of nano materials, and the consistency of product performance is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of nanomaterials, and in particular to a system and method for continuous flame synthesis of carbon-based nanomaterials. Background Art

[0002] Flame synthesis of nanomaterials is a technology that uses flame reactions to synthesize nanoscale materials. This technology has attracted widespread attention due to its high efficiency, rapidity and economy, and has shown significant application potential in the preparation of metal oxides, metal nanoparticles and carbon-based materials. The basic principle of flame synthesis technology is to achieve gas combustion reaction in a flame to form ultra-small nanoparticles. Through steps such as cooling and collection, the synthesized nanoparticles can be widely used in many fields such as catalysts, optoelectronic materials, drug delivery, sensors and composite materials.

[0003] The advantages of flame synthesis of nanomaterials include high efficiency, low cost, adjustability and environmental friendliness. Compared with other synthesis methods (such as chemical vapor deposition, CVD), flame synthesis is fast, can prepare nanomaterials in a short time, and has low equipment and operation costs. By adjusting parameters such as flame temperature, flow rate and composition of the reaction gas, the morphology and properties of nanomaterials can be effectively adjusted. In addition, the flame synthesis process is simple, produces less waste, and has good environmental characteristics.

[0004] Studies have shown that the flame synthesis method for preparing nanomaterials is sensitive to the influence of combustion parameters and has high requirements for temperature, equivalence ratio and mixing conditions. Flame synthesis of nanomaterials faces problems such as particle size control, product purity, process controllability, large-scale production and material stability. How to achieve a more uniform particle size distribution is still one of the technical difficulties. In addition, improving the process to reduce impurities generated during the synthesis process is also a task that needs to be solved urgently. In-depth research on the flame synthesis reaction mechanism can improve the controllability of the synthesis process, and the technical route for converting laboratory-scale technology into industrial production also needs further exploration. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a system and method for continuous flame synthesis of carbon-based nanomaterials, which can provide a uniform temperature field and concentration field for the synthesis of carbon-based nanomaterials, can meet the conditions required for the generation of nanomaterials, and is conducive to promoting the output and standardized production of nanomaterials.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the present invention, there is provided a system for continuous flame synthesis of carbon-based nanomaterials, comprising a flame platform, a catalytic substrate support device, a cooling water supply device and an inert gas / reducing gas supply device;

[0008] The flame platform is in an open ring shape, a plurality of combustion nozzles are evenly installed on the flame platform, and the inert gas / reducing gas supply device is located at the opening of the annular flame platform;

[0009] The catalytic substrate support device includes a support shaft and a plurality of connecting rods, the support shaft is located on the annular axis of the flame platform, the plurality of connecting rods are vertically installed on the top of the support shaft, a catalytic substrate fixing plate is installed at the end of the connecting rod, and the catalytic substrate is fixed on the lower surface of the catalytic substrate fixing plate, so that the catalytic substrate is located above the combustion nozzle and separated by a set distance;

[0010] Cooling water channels are provided inside the support shaft, the connecting rod and the catalyst substrate fixing plate, and the cooling water channels are connected to a cooling water supply device.

[0011] In some embodiments of the present invention, the bottom of the support shaft is fixed on a lifting device, and the lifting device drives the support shaft to rise and fall to adjust the distance between the catalytic substrate and the combustion nozzle. The lifting device is fixed on a rotating table, and the rotating table drives the catalytic substrate to rotate.

[0012] In some embodiments of the present invention, a cooling water inlet channel and a cooling water outlet channel are provided in the support shaft and the connecting rod, the catalytic substrate fixing plate adopts a hollow structure, and a cooling water inlet and a cooling water outlet are provided on the catalytic substrate fixing plate, the cooling water inlet is connected to the cooling water inlet channel, and the cooling water outlet is connected to the cooling water outlet channel.

[0013] In some embodiments of the present invention, the cooling water inlet channel and the cooling water outlet channel inside the support shaft are respectively led out through a cooling water inlet pipe and a cooling water outlet pipe and connected to a cooling water supply device.

[0014] In some embodiments of the present invention, the inert gas / reducing gas supply device includes an inert gas / reducing gas nozzle, and the inert gas / reducing gas nozzle is connected to an inert gas tank or a non-combustible hydrocarbon fuel tank through a pipeline.

[0015] In some embodiments of the present invention, the catalytic substrate fixing plate is fan-shaped, and a groove is arranged on the lower surface of the catalytic substrate fixing plate. The shape of the groove matches the shape of the catalytic substrate. A plurality of clips are arranged on the edge of the groove, and the clips fix the catalytic substrate in the groove.

[0016] In some embodiments of the present invention, the plurality of combustion nozzles are arranged in different combinations on the flame platform and are arranged in multiple layers from the inside to the outside.

[0017] In some embodiments of the present invention, the flame platform, the catalytic substrate support device, the cooling water supply device and the inert gas / reducing gas supply device are all fixed on the bottom plate.

[0018] In a second aspect of the present invention, a method for continuous flame synthesis of carbon-based nanomaterials is provided, comprising:

[0019] Adjust the distance between the lower surface of the catalyst substrate fixing plate and the nozzle, and drive the catalyst substrate fixing plate to rotate at a set speed through the support shaft and the connecting rod;

[0020] When the substrate fixing plate rotates to the notch of the flame platform, the catalytic substrate is replaced, the catalytic substrates of the synthesized nanomaterials are removed in turn, and a new catalytic substrate is installed on the lower surface of the catalytic substrate fixing plate for a new round of synthesis. By adjusting the distance between the catalytic substrate and the flame platform, the temperature window of the nanosynthesized material is within the set flame temperature;

[0021] During the rotation of the catalytic substrate, free carbon atoms grow into nanocrystals on the catalytic substrate. At the same time, cooling water is provided to the catalytic substrate fixing plate through a cooling water supply device, so that the temperature of the catalytic substrate plate is kept within a certain range, ensuring that the catalytic substrate is always in a temperature window that is conducive to nanomaterials.

[0022] After the nano material flame synthesis is completed, an inert gas / reducing gas supply device is used to provide an inert atmosphere or a reducing atmosphere.

[0023] In some embodiments of the present invention, the composition of the nozzle inlet is a mixture of hydrocarbon fuel and air, the equivalence ratio during the flame group combustion process is 0.8-2.0, and the distance between the lower surface of the catalytic substrate fixing plate and the nozzle is adjusted according to the change in fuel flow rate, so that the temperature window for nanomaterial synthesis is maintained at 500-800°C.

[0024] One or more technical solutions of the present invention have the following beneficial effects:

[0025] (1) The system for continuous flame synthesis of carbon-based nanomaterials provided by the present invention provides a uniform temperature field and free carbon atom atmosphere for the synthesis process of nanomaterials by setting a flame platform with an annular opening, flexibly adjusts the distance between the catalytic substrate and the nozzle by setting a catalytic substrate support device, and can adjust the synthesis time of nanomaterials by adjusting the rotation speed of the catalytic substrate, thereby providing stable and uniform growth conditions for large-scale synthesis of nanomaterials, which is beneficial to ensuring the consistency of product performance; at the same time, during the synthesis process, the amount of cooling water is adjusted by a cooling water supply device so that the temperature of the catalytic substrate plate remains unchanged, and an inert gas / reducing gas supply device is set at the opening of the flame platform to provide an inert atmosphere or a reducing atmosphere at the end of the flame synthesis period, and the nanomaterial plates are collected and replaced with fresh catalytic substrates in the opening area, and the next round of synthesis is started to achieve continuous production.

[0026] (2) The flame platform provided by the present invention has combined nozzles evenly arranged on the flame platform. By using the combined nozzle combustion mode, the flame is dispersedly arranged to make the temperature field more uniform in the transverse section direction, and the effective temperature window area is increased, which can realize the large-scale application of the flame synthesis method for preparing nanomaterials; in addition, it can also realize the flexible adjustment of the overall equivalent ratio and the local equivalent ratio to meet the conditions for the generation of nanomaterials with different characteristics, which is conducive to promoting the output and standardized production of nanomaterials.

[0027] (3) The catalytic substrate supporting device provided by the present invention can realize the rotation of the catalytic substrate fixing plate under the action of the lifting device and the rotating table, thereby realizing the lifting and rotation of the catalytic substrate, and realizing the adjustment of the distance between the catalytic substrate and the nozzle and the synthesis time. The catalytic substrate fixing plate can realize temporary fixation of the catalytic substrate. The catalytic substrate provides an attachment point and a catalyst for the growth of nanomaterials. Considering that the temperature of the catalytic substrate fixing plate changes due to the influence of material, area and thickness, the present invention proposes a catalytic substrate fixing plate with water supply temperature adjustment, which controls the temperature of the metal substrate to be uniform and stable by changing the water flow rate, thereby improving the output of nanomaterials and the standardization of products.

[0028] (4) The system for continuous flame synthesis of carbon-based nanomaterials provided by the present invention can obtain a larger amount of free carbon atoms by increasing the fuel flow rate when the synthesis rate of nanomaterials needs to be increased while ensuring that the composition at the flame group outlet remains unchanged. The system can coordinate the distance between the catalytic substrate and the flame group, the rotation speed of the catalytic substrate, and the water flow rate of the cooling system of the cooling fixed plate to ensure that the parameters of the nanomaterial synthesis temperature window and the synthesis time are optimized to meet different production efficiency requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A front view of a system for continuous flame synthesis of carbon-based nanomaterials according to the present invention;

[0030] Figure 2 A top view of the flame platform of the present invention;

[0031] Figure 3 is a top view of the catalytic substrate support device of the present invention;

[0032] Figure 4 This is a bottom view of the catalytic substrate fixing plate.

[0033] In the figure: 1. flame platform; 101. combustion nozzle; 102. opening; 2. catalytic substrate supporting device; 201. supporting shaft; 2011. cooling water inlet channel; 2012. cooling water outlet channel; 202. connecting rod; 203. catalytic substrate fixing plate; 2031. groove; 2032. buckle; 2033. cooling water inlet; 2034. cooling water outlet; 3. cooling water supply device; 301. cooling water inlet pipe; 302. cooling water outlet pipe; 303. cooling water tank; 304. water pump; 305. rotary joint; 4. inert gas / reducing gas supply device; 401. inert gas / reducing gas nozzle; 402. inert gas / fuel gas pipeline; 403. inert gas tank / hydrocarbon fuel tank; 5. lifting device; 6. rotating table; 7. catalytic substrate; 8. bottom plate; 9. supporting column. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Example 1

[0036] In a typical embodiment of the present invention, a system for continuous flame synthesis of carbon-based nanomaterials is provided, such as Figure 1-Figure 4 As shown, it includes a flame platform 1, a catalytic substrate support device 2, a cooling water supply device 3 and an inert gas / reducing gas supply device 4;

[0037] The flame platform 1 is in an open ring shape, and a plurality of combustion nozzles 101 are evenly installed on the flame platform 1. The inert gas / reducing gas supply device 4 is located at the opening 102 of the flame platform 1;

[0038] The catalytic substrate support device 2 includes a support shaft 201 and a plurality of connecting rods 202, wherein the support shaft 201 is located on the annular axis of the flame platform 1, and the plurality of connecting rods 202 are vertically mounted on the top of the support shaft 201, and a catalytic substrate fixing plate 203 is mounted on the end of the connecting rod 202, and a catalytic substrate 7 is fixed on the lower surface of the catalytic substrate fixing plate 203, so that the catalytic substrate 7 is located above the combustion nozzle 101 and separated by a set distance;

[0039] Cooling water channels are provided inside the support shaft 201 , the connecting rod 202 and the catalyst substrate fixing plate 203 , and the cooling water channels are connected to the cooling water supply device 3 .

[0040] like Figure 2 As shown, the flame platform 1 provides a uniform temperature field and a free carbon atom field for the synthesis of nano-catalytic materials. A plurality of combustion nozzles 101 are installed on the flame platform 1. The plurality of combustion nozzles 101 are arranged in different combinations on the flame platform 1, and can be distributed in a ring shape, a square shape or a diamond shape. In addition, multiple layers of combustion nozzles can be arranged from the inside to the outside as needed. Each nozzle in the flame group is equipped with different hydrocarbon fuel and air connection inlets. Through the connection mode of hydrocarbon fuel and air, the flame group can be transformed into a premixed and diffused combustion mode according to the synthesis needs of different nano-materials; the relative flow rate of hydrocarbon fuel and air is adjusted, and the equivalent ratio in the combustion process of the flame group is changed, ranging from 0.8 to 2.0, so as to meet the atmosphere requirements of different nano-materials during synthesis and realize flexible adjustment of the characteristics of nano-materials.

[0041] The catalytic substrate support device 2 supports the catalytic substrate. The bottom of the support shaft 201 is fixed on the lifting device 5. The lifting device 5 drives the support shaft 201 to rise and fall to adjust the distance between the catalytic substrate 7 and the combustion nozzle 101. The lifting device 5 is fixed on the rotating table 6. The rotating table 6 drives the catalytic substrate 7 to rotate. By adjusting the distance between the catalytic substrate 7 and the combustion nozzle 101, the adjustment range of the distance is 50-100mm, and the nano material synthesis temperature can be stabilized between 500-800°C. By adjusting the rotation speed of the catalyst material, the residence time of the catalytic substrate in the flame zone, that is, the nano material synthesis time, can be adjusted. The synthesis time ranges from more than ten seconds to several minutes.

[0042] In this embodiment, the support shaft 201 and the connecting rod 202 are both provided with a cooling water inlet channel 2011 and a cooling water outlet channel 2012, the catalytic substrate fixing plate 203 adopts a hollow structure, and the catalytic substrate fixing plate 203 is provided with a cooling water inlet 2033 and a cooling water outlet 2034, the cooling water inlet is connected to the cooling water inlet channel, and the cooling water outlet is connected to the cooling water outlet channel. Further, the cooling water inlet channel and the cooling water outlet channel inside the support shaft 201 are respectively led out through the cooling water inlet pipe 301 and the cooling water outlet pipe 302, and are connected to the cooling water supply device 3. Specifically, the cooling water inlet pipe 301 and the cooling water outlet pipe 302 pass through the lifting device 5 and the rotating table 6 and are led out through the rotating joint 305 to avoid the rotation of the rotating table from affecting the water pipe. The lifting device 5 and the rotating table 6 both adopt the existing structure.

[0043] The cooling water supply device 3 includes a cooling water tank 303, a cooling water inlet pipe 301 and a cooling water outlet pipe 302 connected, and a water pump 304 is provided to provide power for delivery. Through the cooling water supply device, it is possible to adjust the cooling water volume to keep the temperature of the catalytic substrate 7 within a fixed range at different flame thermal powers and different synthesis heights, so as to ensure the high efficiency of nanomaterial synthesis and the consistency of the product.

[0044] In this embodiment, the inert gas / reducing gas supply device 4 includes an inert gas / reducing gas nozzle 401, and the inert gas / reducing gas nozzle 401 is connected to the inert gas tank / hydrocarbon fuel tank 403 through the inert gas / fuel gas pipeline 402. The inert gas / reducing gas supply device 4 is provided to provide an inert atmosphere or a reducing atmosphere at the end of the flame synthesis to prevent the generated nanomaterial from being oxidized during the cooling process. The inert gas can be selected from nitrogen, argon, etc., and the non-combustible hydrocarbon fuel can specifically be C2-C8 alkanes, alcohols, etc.

[0045] like Figure 3 and Figure 4 As shown, the catalytic substrate fixing plate 203 is fan-shaped, and the catalytic substrate fixing plate 203 is made of metal material with high thermal conductivity, such as copper, aluminum, etc., to ensure that the cooling system inside the substrate fixing plate, as well as between the substrate fixing plate and the catalytic substrate, has high heat exchange efficiency. A groove 2031 is provided on the lower surface of the catalytic substrate fixing plate 203, and the shape of the groove 2031 matches the shape of the catalytic substrate 7. A plurality of buckles 2032 are provided at the edge of the groove 2031, and the buckles 2032 fix the catalytic substrate 7 in the groove 2031.

[0046] In this embodiment, the catalytic substrate 7 can be made of catalytic materials such as Ni-based, Fe-based, and Cu-based. The catalytic substrate 7 provides attachment points and catalysts for the growth of nanomaterials. The hydrocarbon fuel flame contains a large amount of free carbon atoms. When the temperature and atmosphere meet the conditions, the free carbon atoms precipitate and grow on the surface of the nanocrystals on the surface of the catalytic substrate. When they grow to a certain thickness, increasing the residence time in the flame does not increase the output, and it is necessary to provide them with new catalytic substrate growth points, that is, the catalytic substrate needs to be replaced after the nanocrystals grow to a certain thickness.

[0047] In this embodiment, the flame platform 1, the catalytic substrate supporting device 2, the cooling water supply device 3 and the inert gas / reducing gas supply device 4 are all fixed on the base plate 8. The flame platform 1 is supported on the base plate 8 by support columns 9, and the base plate 8 provides support for each device.

[0048] The working principle of the system for continuous flame synthesis of carbon-based nanomaterials provided in this embodiment is as follows:

[0049] The flame platform uses the combustion form of flame groups to provide a nanomaterial synthesis environment with uniform temperature field and adjustable atmosphere for the synthesis process of nanomaterials. The number of flame groups can be adjusted according to the size of the production scale to achieve the change of the synthesis area. Organizing combustion in the form of flame groups can obtain temperature fields and concentration fields uniformly distributed in the horizontal direction, provide stable and uniform growth conditions for large-scale synthesis of nanomaterials, and help ensure the consistency of product performance. A catalytic substrate is arranged above the flame group. The number of catalytic substrates can be adjusted according to the production scale and the size of the flame group. When the production efficiency is increased by increasing the fuel flow rate, the flame height increases, and the height of the catalytic substrate relative to the flame group is adjustable to ensure that the temperature window of nanomaterial synthesis remains at 500-800℃. Each nozzle in the flame group is equipped with a different connection inlet to change the premixed or diffused combustion mode. By adjusting the inlet composition, the equivalent ratio in the combustion process of the flame group is changed to meet the atmosphere requirements for the synthesis of different nanomaterials. When the nozzle structure is too complicated, it can be realized with the help of 3D printing. A cooling water flow space is arranged on the substrate fixing plate, which can achieve the temperature of the catalytic substrate plate to remain unchanged by adjusting the cooling water volume at different flame thermal powers and different synthesis heights. At the annular opening of the flame group, a non-burning hydrocarbon fuel gas flow is set to provide a reducing atmosphere at the end of the flame synthesis. At the same time, the nanomaterial plates are collected and replaced with fresh catalytic substrates at the opening to start the next round of synthesis and achieve continuous production.

[0050] Example 2

[0051] In a typical embodiment of the present invention, a method for continuous flame synthesis of carbon-based nanomaterials is provided, comprising:

[0052] Adjust the distance between the lower surface of the catalyst substrate fixing plate and the nozzle, and drive the catalyst substrate fixing plate to rotate at a set speed through the support shaft and the connecting rod;

[0053] When the substrate fixing plate rotates to the notch of the flame platform, the catalytic substrate is replaced, the catalytic substrates of the synthesized nanomaterials are removed in turn, and a new catalytic substrate is installed on the lower surface of the catalytic substrate fixing plate for a new round of synthesis. By adjusting the distance between the catalytic substrate and the flame platform, the temperature window of the nanosynthesized material is within the set flame temperature;

[0054] During the rotation of the catalytic substrate, free carbon atoms grow into nanocrystals on the catalytic substrate. At the same time, cooling water is provided to the catalytic substrate fixing plate through a cooling water supply device, so that the temperature of the catalytic substrate plate is kept within a certain range, ensuring that the catalytic substrate is always in a temperature window that is conducive to nanomaterials.

[0055] After the nano material flame synthesis is completed, an inert gas / reducing gas supply device is used to provide an inert atmosphere or a reducing atmosphere.

[0056] Furthermore, the composition of the nozzle inlet is a mixture of hydrocarbon fuel and air, the equivalence ratio during the flame group combustion process is 0.8-2.0, and the distance between the lower surface of the catalytic substrate fixing plate and the nozzle is adjusted according to the change of the fuel flow rate, so that the temperature window for nanomaterial synthesis is maintained at 500-800°C; for example, when synthesizing carbon nanotubes, the catalytic substrate is located in the top area of ​​the flame, and the distance between the lower surface of the catalytic substrate fixing plate and the nozzle is 50-100mm; when synthesizing graphene, the catalytic substrate is located in the core area of ​​the flame, and the distance between the lower surface of the catalytic substrate fixing plate and the nozzle is less than 20mm.

[0057] The method that the present embodiment provides can be by flame synthesis carbon-based nanometer material, as carbon nanotube, graphene etc., contain a large amount of free carbon atoms in hydrocarbon fuel flame, when temperature and atmosphere meet condition, free carbon atoms are at catalytic substrate, as Ni-based, Fe-based, Cu-based etc. nanocrystal surface precipitation growth, after it grows to certain thickness, increase the residence time in flame and can not make output increase, need to provide new catalytic substrate growth point for it, provide new nano material growth point by changing catalytic substrate.After flame synthesis finishes, by creating inert atmosphere or reducing atmosphere, to prevent the nano material generated from being oxidized in cooling process.Realize the continuous production of nano material flame synthesis, can guarantee to have fresh nano crystal surface in the synthesis initial stage, can also provide inert atmosphere or reducing atmosphere at the end.

[0058] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A system for continuous flame synthesis of carbon-based nanomaterials, characterized in that: It includes a flame platform, a catalytic substrate support device, a cooling water supply device and an inert gas / reducing gas supply device; The flame platform is in an open ring shape, a plurality of combustion nozzles are evenly installed on the flame platform, and the inert gas / reducing gas supply device is located at the opening of the annular flame platform; The catalytic substrate support device includes a support shaft and a plurality of connecting rods, the support shaft is located on the annular axis of the flame platform, the plurality of connecting rods are vertically installed on the top of the support shaft, a catalytic substrate fixing plate is installed at the end of the connecting rod, and the catalytic substrate is fixed on the lower surface of the catalytic substrate fixing plate, so that the catalytic substrate is located above the combustion nozzle and separated by a set distance; Cooling water channels are provided inside the support shaft, the connecting rod and the catalyst substrate fixing plate, and the cooling water channels are connected to a cooling water supply device.

2. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The bottom of the support shaft is fixed on a lifting device, and the lifting device drives the support shaft to rise and fall to adjust the distance between the catalytic substrate and the combustion nozzle. The lifting device is fixed on a rotating table, and the rotating table drives the catalytic substrate to rotate.

3. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The support shaft and the connecting rod are both provided with a cooling water inlet channel and a cooling water outlet channel. The catalytic substrate fixing plate adopts a hollow structure, and the catalytic substrate fixing plate is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the cooling water inlet channel, and the cooling water outlet is connected to the cooling water outlet channel.

4. The system for continuous flame synthesis of carbon-based nanomaterials as claimed in claim 3, characterized in that: The cooling water inlet channel and the cooling water outlet channel inside the support shaft are respectively led out through a cooling water inlet pipe and a cooling water outlet pipe and connected to a cooling water supply device.

5. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The inert gas / reducing gas supply device comprises an inert gas / reducing gas nozzle, and the inert gas / reducing gas nozzle is connected to an inert gas tank or a non-combustible hydrocarbon fuel tank through a pipeline.

6. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The catalytic substrate fixing plate is fan-shaped, and a groove is arranged on the lower surface of the catalytic substrate fixing plate. The shape of the groove matches the shape of the catalytic substrate. A plurality of buckles are arranged on the edge of the groove, and the buckles fix the catalytic substrate in the groove.

7. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The plurality of combustion nozzles are arranged in different combinations on the flame platform and are arranged in multiple layers from the inside to the outside.

8. The system for continuous flame synthesis of carbon-based nanomaterials according to claim 1, characterized in that: The flame platform, the catalytic substrate supporting device, the cooling water supply device and the inert gas / reducing gas supply device are all fixed on the bottom plate.

9. A method for continuous flame synthesis of carbon-based nanomaterials, using the system according to any one of claims 1 to 8, characterized in that: include: Adjust the distance between the lower surface of the catalyst substrate fixing plate and the nozzle, and drive the catalyst substrate fixing plate to rotate at a set speed through the support shaft and the connecting rod; When the substrate fixing plate rotates to the notch of the flame platform, the catalytic substrate is replaced, the catalytic substrates of the synthesized nanomaterials are removed in turn, and a new catalytic substrate is installed on the lower surface of the catalytic substrate fixing plate for a new round of synthesis. By adjusting the distance between the catalytic substrate and the flame platform, the temperature window of the nanosynthesized material is within the set flame temperature; During the rotation of the catalytic substrate, free carbon atoms grow into nanocrystals on the catalytic substrate. At the same time, cooling water is provided to the catalytic substrate fixing plate through a cooling water supply device, so that the temperature of the catalytic substrate plate is kept within a certain range, ensuring that the catalytic substrate is always in a temperature window that is conducive to nanomaterials. After the nano material flame synthesis is completed, an inert gas / reducing gas supply device is used to provide an inert atmosphere or a reducing atmosphere.

10. The method for continuous flame synthesis of carbon-based nanomaterials according to claim 9, characterized in that: The composition of the nozzle inlet is a mixture of hydrocarbon fuel and air, and the equivalence ratio during the flame group combustion process is 0.8-2.

0. The distance between the lower surface of the catalytic substrate fixing plate and the nozzle is adjusted according to the change of fuel flow rate, so that the temperature window for nanomaterial synthesis is maintained at 500-800℃.

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