System for synthesizing nano-particles through double-flame spray pyrolysis

Abstract

The utility model relates to a system for synthesizing nano-particles through double-flame spray pyrolysis. The system comprises a double-flame spray pyrolysis burner group (1), a visual flame reaction protective cover (2) and a nano-particle collecting device (3), the double-flame spray pyrolysis burner group (1) is arranged in the visual flame reaction protective cover (2) and comprises two spray pyrolysis burners which are arranged at an included angle, the nano-particle collecting device (3) comprises a vacuum pipeline (31) and a particle filtering and collecting assembly (32) arranged on the vacuum pipeline (31), and the vacuum pipeline (31) is communicated with the visual flame reaction protective cover (2). Compared with the prior art, the problems that the temperature distribution of a single-flame system is not uniform and the reaction atmosphere cannot be accurately controlled can be solved.

Description

Technical Field

[0001] This invention relates to the field of nanoparticle preparation technology, and in particular to a dual-flame spray pyrolysis system for synthesizing nanoparticles. Background Technology

[0002] Flame spray pyrolysis is an important method for synthesizing nanoparticles. It generates nanoparticles by atomizing liquid precursors and combining this with a high-temperature combustion reaction. Flame spray pyrolysis relies on the temperature of the flame to drive the reaction; however, the temperature distribution of the flame is often uneven, leading to product inhomogeneity. Furthermore, the reaction atmosphere (such as the ratio of oxygen, nitrogen, and hydrogen) during flame spraying affects the morphology and composition of the products. However, the atmosphere in a single-flame environment is difficult to precisely control, which may lead to instability in the reaction process, and the quality and morphology of the generated materials may not be precisely controlled. Excessively high local temperatures or uneven temperature distribution in the flame may cause over-pyrolysis of the precursor material, resulting in larger particles or particle aggregates, affecting the dispersibility and application performance of the nanoparticles. Simultaneously, the generated nanoparticles require effective collection and post-processing; otherwise, the products may adhere to the inside of the equipment or exhibit particle aggregation, affecting the purity and performance of the material.

[0003] Chinese patent CN112610953A describes a system for flame synthesis of nanoparticles, which discloses that the system includes a burner, a visualized combustion chamber, and multiple dilution and quenching devices. However, this system only utilizes a single flame to prepare nanoparticles and cannot meet the requirements for controlling the temperature field and structural morphology of the nanoparticles. Utility Model Content

[0004] The purpose of this invention is to provide a dual-flame spray pyrolysis synthesis system for nanoparticles, which solves the problems of uneven temperature distribution and inaccurate control of the reaction atmosphere in single-flame systems.

[0005] The purpose of this utility model can be achieved through the following technical solution: a dual-flame spray pyrolysis synthesis nanoparticle system, including a dual-flame spray pyrolysis burner group, a visible flame reaction protective cover and a nanoparticle collection device;

[0006] The dual-flame spray pyrolysis burner assembly is housed within a visible flame reaction protective hood and includes two spray pyrolysis burners arranged at an angle. The nanoparticle collection device includes a vacuum pipe and a particle filtration and collection assembly mounted on the vacuum pipe, which is connected to the visible flame reaction protective hood. The particle filtration and collection device is used to separate and collect particles from the flue gas.

[0007] Preferably, the spray pyrolysis burner includes a main body and a combustion gas inlet, a dispersion gas inlet, a protective gas inlet, and a solution inlet formed on the main body;

[0008] The combustion gas inlet is connected to the combustion gas outlet through a combustion gas pipeline, the dispersion gas inlet is connected to the dispersion gas outlet through a dispersion gas pipeline, the protective gas inlet is connected to the protective gas outlet through a protective gas pipeline, and the solution inlet is connected to the solution outlet through a solution pipeline.

[0009] The combustion gas outlet, protective gas outlet, and solution outlet are located on the upper end face of the main body, and the dispersion gas outlet is connected to the solution outlet.

[0010] More preferably, the main body has a rotating structure, and the combustion gas inlet, the dispersion gas inlet, and the protective gas inlet are spaced apart on the side of the main body along the axis of the main body.

[0011] More preferably, the protective gas inlet, the combustion gas inlet, and the dispersion gas inlet are arranged sequentially at intervals along the main body axis.

[0012] More preferably, the protective gas outlet ring is located outside the combustion gas outlet, the combustion gas outlet ring is located outside the solution outlet, and the dispersion gas outlet is located inside the main body and connected to the solution outlet.

[0013] Preferably, a metal foam structure is embedded at the combustion gas outlet and the protective gas outlet.

[0014] Preferably, nickel foam is embedded at the combustion gas outlet and the protective gas outlet.

[0015] In this invention, each air inlet or liquid inlet of the two spray pyrolysis burners is connected to the corresponding gas source or liquid source through a pipeline.

[0016] More preferably, the spray pyrolysis burner further includes a support and adjustment device for supporting and adjusting the height and angle of the main body.

[0017] Preferably, the visible flame reaction protective cover is a protective cover with a glass viewing window.

[0018] Preferably, the dual-flame spray pyrolysis synthesis nanoparticle system further includes an igniter.

[0019] More preferably, the igniter body is located outside the visible flame reaction protective cover, and its end can extend into the visible flame reaction protective cover.

[0020] More preferably, the end of the igniter is retractable after providing a spark to avoid interfering with the flame.

[0021] In this invention, one end of the spray pyrolysis burner with a gas outlet is inclined toward the other spray pyrolysis burner, that is, the bottoms of the two spray pyrolysis burners are far apart and the tops are close together.

[0022] Preferably, the two spray pyrolysis burners are arranged symmetrically at an included angle.

[0023] Preferably, the two spray pyrolysis burners have identical structures.

[0024] Preferably, one end of the vacuum pipe is connected to the top outlet of the visible flame reaction protective cover, and the other end is connected to a vacuum pump.

[0025] More preferably, the end of the vacuum pipe connected to the top outlet of the visible flame reaction protective cover is provided with a tapering structure.

[0026] Preferably, the dual-flame spray pyrolysis synthesis nanoparticle system further includes a gas supply component for supplying the required gas to the dual-flame spray pyrolysis burner assembly.

[0027] More preferably, the gas includes a combustion gas.

[0028] More preferably, the combustion gas includes methane.

[0029] More preferably, the gas includes compressed air.

[0030] In this invention, compressed air can be used as both a combustion gas and a dispersion gas.

[0031] More preferably, the gas includes a protective gas.

[0032] More preferably, the protective gas includes nitrogen.

[0033] More preferably, the gas supply assembly includes a gas cylinder, an air compressor, and a gas flow meter. The gas cylinder and the air compressor are connected to the air inlet on the main body of the spray pyrolysis burner via a pipeline, and the pipeline is equipped with a gas flow meter.

[0034] More preferably, the pipeline is equipped with a flow regulating valve, which is connected to a gas flow meter.

[0035] Preferably, the flow regulating valve and the gas flow meter are connected to the control assembly.

[0036] More preferably, the control component includes a PLC controller.

[0037] More preferably, the control component is connected to an air compressor.

[0038] Preferably, the dual-flame spray pyrolysis system for synthesizing nanoparticles further includes a liquid supply assembly for providing the required metal salt or organic precursor solution to the dual-flame spray pyrolysis burner assembly.

[0039] More preferably, the metal salt or organic precursor solution includes a cobalt nitrate and ferric nitrate ethanol solution, or a ferric nitrate and tetrabutyl titanate ethanol solution.

[0040] More preferably, the liquid supply assembly includes an injection pump, which is connected via a pipeline to an inlet on the main body of the spray pyrolysis burner and a storage tank for a metal salt or organic precursor solution.

[0041] More preferably, the pipe is equipped with a liquid flow meter.

[0042] Preferably, the syringe pump and the liquid flow meter are connected to the control assembly.

[0043] More preferably, the control component includes a PLC controller.

[0044] Preferably, the particle filtration and collection assembly is detachably mounted on a vacuum pipe.

[0045] In this invention, the particle filtration and collection component can separate, intercept, and collect nanoparticles in flue gas.

[0046] Preferably, the particle filtration and collection assembly includes a cyclone dust collector.

[0047] A method for synthesizing nanoparticles by dual-flame spray pyrolysis, using the above-mentioned system, includes the following steps:

[0048] S1: Adjust the height and angle of the two spray pyrolysis burners in the dual-flame spray pyrolysis burner group;

[0049] S2: The dual-flame spray pyrolysis burner assembly generates nanoparticles within a visible flame reaction shield through spray pyrolysis;

[0050] S3: Nanoparticles are collected and separated by the vacuum pipes and particle filtration collection components of the nanoparticle collection device.

[0051] Preferably, after collection is completed, the particle filtration and collection assembly is removed from the vacuum pipe to collect the nanoparticles.

[0052] The working principle of the dual-flame spray pyrolysis burner assembly in this invention is as follows:

[0053] More precise thermal control and reaction regulation are achieved by utilizing two independent combustion flames. A solution of metal salts or organic precursors is injected into the flame, forming tiny droplets. These droplets rapidly evaporate and decompose, undergoing a pyrolysis reaction. The burner typically consists of fuel gas and oxygen from the air, ensuring flame stability and uniform temperature distribution. Upon entering the flame, the droplets rapidly evaporate due to intense heat transfer, and the precursors decompose at high temperatures, generating metal oxides or other nanostructured materials. Due to the high temperature in the flame region and the rapid diffusion of the gas flow, the products can condense into nanoscale particles in a very short time. Finally, the nanoparticles rapidly condense and are collected through a cooling process, typically at the flame outlet via sedimentation or gas transport. In nanoparticle preparation, the dual-flame burner optimizes particle growth and condensation processes by precisely controlling the relative position and flame intensity between the two flames. The fuel-to-oxidant ratio, combustion temperature, and gas flow rate can be optimized by adjusting the parameters of the two flames to meet the needs of specific material synthesis. Furthermore, the dual-flame system effectively reduces fluctuations in the cooling rate, avoids over-condensation or sintering, and improves particle morphology uniformity and dispersibility. This structure not only improves particle yield but also enables precise control over particle size, crystal form, and surface properties.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. This utility model provides an integrated device for the effective recovery of nanoparticles by a dual-flame spray pyrolysis method, which prepares and efficiently recovers particles through dual-flame spray pyrolysis technology.

[0056] 2. This utility model integrates dual-flame spray pyrolysis technology with a nanoparticle deposition and recovery device. The dual-flame design achieves uniform temperature field distribution and improves the controllability of particle morphology. At the same time, through the optimized modular design of the equipment, the entire process from nanoparticle generation to recovery is integrated, which can be used for the efficient preparation and effective recovery of nanoparticles.

[0057] 3. This utility model provides an integrated dual-flame spray pyrolysis device. Through innovative dual-flame design and modular integrated structure, it achieves high efficiency and high quality in nanoparticle preparation, as well as high efficiency and environmental friendliness in the recycling process, solving problems such as poor multi-component control performance and difficulty in flame synthesis collection in related technologies.

[0058] 4. This invention optimizes temperature distribution and reaction atmosphere through the synergistic effect of dual flames. By introducing a dual-flame system, the equipment can set different temperatures and reaction atmospheres in the two flame zones respectively, thereby achieving more precise temperature control and atmosphere regulation. This innovative design solves the problems of uneven temperature distribution and inaccurate control of the reaction atmosphere in single-flame systems.

[0059] 5. This utility model adopts an adjustable spray system, which can adjust the spray particle size, spray volume and spray angle according to the characteristics of different precursor substances to ensure uniform distribution of substances during the reaction process and improve reaction efficiency and dispersion of nanoparticles.

[0060] 6. This utility model is an integrated recycling system that combines recycling technology to simultaneously recover unreacted precursors and byproducts during spray pyrolysis, greatly improving the utilization efficiency of raw materials.

[0061] 7. This utility model has the advantages of high process flexibility, high recycling efficiency and environmental friendliness, and is widely applicable to the preparation of nano-oxides, metal particles and other functional materials. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the structure of the dual-flame spray pyrolysis synthesis nanoparticle system of this utility model;

[0063] Figure 2 This is a schematic diagram of the support and adjustment of the spray pyrolysis burner of this utility model. Figure 1 ;

[0064] Figure 3 This is a schematic diagram of the support and adjustment of the spray pyrolysis burner of this utility model. Figure 2 ;

[0065] Figure 4 This is a schematic diagram of the structure of the spray pyrolysis burner of this utility model;

[0066] Figure 5 This is a bottom view of the spray pyrolysis burner of this utility model;

[0067] Figure 6 This is a top view of the spray pyrolysis burner of this utility model;

[0068] Figure 7 for Figure 6 A sectional view;

[0069] Figure 8 This is a schematic diagram of the internal structure of the spray pyrolysis burner of this utility model;

[0070] Figure 9 This is a schematic diagram of the process for synthesizing nanoparticles by spray pyrolysis according to this utility model;

[0071] In the diagram: 1-Dual-flame spray pyrolysis burner assembly, 11-Main body, 12-Combustion gas inlet, 13-Dispersion gas inlet, 14-Protective gas inlet, 15-Solution inlet, 16-Combustion gas pipeline, 17-Combustion gas outlet, 18-Dispersion gas pipeline, 19-Dispersion gas outlet, 110-Protective gas pipeline, 111-Protective gas outlet, 112-Solution pipeline, 113-Solution outlet, 114-Fixed point, 115-Support component, 116-Adjusting component, 2-Visual flame reaction protection hood, 21-Igniter, 3-Nanoparticle collection device, 31-Vacuum pipeline, 32-Particle filter collection assembly, 33-Vacuum pump, 4-Gas supply assembly, 41-Gas cylinder, 42-Air compressor, 43-Gas flow meter, 5-Operating table, 6-Injection pump. Detailed Implementation

[0072] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0073] Example 1

[0074] A dual-flame spray pyrolysis system for synthesizing nanoparticles, such as Figure 1 As shown, it includes a dual-flame spray pyrolysis burner assembly 1, a visible flame reaction protective cover 2, and a nanoparticle collection device 3.

[0075] The dual-flame spray pyrolysis burner 1 includes two spray pyrolysis burners arranged at an angle (i.e., non-parallel) within the visible reaction protective hood 2. The nanoparticle collection device 3 includes a vacuum pipe 31 connected to the visible reaction protective hood 2 and a particle filter collection assembly 32 detachably mounted on the vacuum pipe 31. The particle filter collection assembly 32 is used to separate and collect particles from the flue gas.

[0076] Example 2

[0077] A dual-flame spray pyrolysis system for synthesizing nanoparticles, such as Figures 2-3 As shown, both spray pyrolysis burners include a main body 11 and a support and adjustment device for supporting and adjusting the height and angle of the main body 11. In this embodiment, the support and adjustment device includes a support member 115 and an adjustment member 116. The adjustment member 116 is connected to a fixed point 114 at the bottom of the main body 11, and the support member 115 is connected to the adjustment member 116 and the operating table 5. The height and angle of the two main bodies 11 can be adjusted through the cooperation of the adjustment member 116 and the support member 115, thereby achieving more precise temperature control. The rest is the same as in Embodiment 1.

[0078] Example 3

[0079] A dual-flame spray pyrolysis system for synthesizing nanoparticles includes a support 115 and an adjustment 116, both equipped with connecting plates having multiple threaded holes. By bolting the different threaded holes on the connecting plates of the support 115 and the adjustment 116, the height and angle of the main body 11 and the distance between the two main bodies 11 can be adjusted.

[0080] As a further preferred embodiment, in this embodiment, the support member 115 can also be slidably mounted on the track of the operating table 5. The distance between the two spray pyrolysis burners can be adjusted by adjusting and locking the position of the support member 115 of the two spray pyrolysis burners on the track. The rest is the same as in embodiment 2.

[0081] Example 4

[0082] A dual-flame spray pyrolysis system for synthesizing nanoparticles, such as Figures 4-8 As shown, the spray pyrolysis burner includes a main body 11, a combustion gas inlet 12, a dispersion gas inlet 13, a protective gas inlet 14, a solution inlet 15, a combustion gas pipeline 16, a combustion gas outlet 17, a dispersion gas pipeline 18, a dispersion gas outlet 19, a protective gas pipeline 110, a protective gas outlet 111, a solution pipeline 112, and a solution outlet 113.

[0083] The main body 11 has a cylindrical structure. A combustion gas inlet 12, a dispersion gas inlet 13, and a protective gas inlet 14 are located on the side of the main body 11, while a solution inlet 15 is located at the center of the bottom of the main body 11. Specifically, the combustion gas inlet 12 is connected to the combustion gas outlet 17 via a combustion gas pipeline 16 within the main body 11; the dispersion gas inlet 13 is connected to the dispersion gas outlet 19 via a dispersion gas pipeline 18 within the main body 11; the protective gas inlet 14 is connected to the protective gas outlet 111 via a protective gas pipeline 110 within the main body 11; and the solution inlet 15 is connected to the solution outlet 113 via a solution pipeline 112 within the main body 11.

[0084] In this embodiment, the combustion gas outlet 17, the protective gas outlet 111, and the solution outlet 113 are located on the upper surface of the main body 11, and the dispersion gas outlet 19 is located inside the main body 11 and connected to the solution outlet 113. The liquid and the dispersion gas meet below the surface of the main body 11, causing the liquid to break up and rush out of the surface, while the combustion gas is ignited on the surface of the main body 11. The rest is the same as in Embodiment 1.

[0085] Example 5

[0086] A dual-flame spray pyrolysis system for synthesizing nanoparticles is disclosed. In this embodiment, nickel foam is embedded at the combustion gas outlet 17 and the protective gas outlet 111. The porosity of the nickel foam in this embodiment is 96%. Furthermore, in this embodiment, the protective gas inlet 14, the combustion gas inlet 12, and the dispersion gas inlet 13 are arranged sequentially from top to bottom along the axial direction of the main body 11. The protective gas outlet 111 is arranged around the outside of the combustion gas outlet 17, and the combustion gas outlet 17 is arranged around the outside of the solution outlet 113.

[0087] In this embodiment, the system further includes a gas supply assembly 4 and a liquid supply assembly 4. The gas supply assembly 4 includes a gas cylinder 41, an air compressor 42, and a gas flow meter 43. The liquid supply assembly includes a syringe pump 6. A protective gas inlet 114 is connected to the protective gas cylinder 41 via a pipe, a combustion gas inlet 112 is connected to the combustion gas cylinder 41 via a pipe, and a dispersion gas inlet 113 is connected to the air compressor 42 via a pipe. Each pipe is equipped with a gas flow meter 43. A solution inlet 115 is connected to the syringe pump 6 via a pipe.

[0088] In this embodiment, the dual-flame spray pyrolysis burner assembly 1, the visual flame reaction protection shroud 2, and the nanoparticle collection device 3 are all mounted on the operating table 5. The rest is the same as in Embodiment 4.

[0089] Example 6

[0090] A dual-flame spray pyrolysis synthesis system for nanoparticles, in this embodiment, the combustion gas pipeline 16, the dispersion gas pipeline 18, and the protective gas pipeline 110 all include radial pipelines and axial pipelines. One end of the radial pipeline is connected to the air inlet, and the other end is connected to the axial pipeline through a vent hole. The output end of the axial pipeline is provided with a gas outlet.

[0091] Furthermore, in this embodiment, an axial flow guide is also provided on the radial pipeline, which can make the gas more uniform and stable. The rest is the same as in Embodiment 5.

[0092] Example 7

[0093] A recovery device for effectively recovering nanoparticles using a dual-flame spray pyrolysis method includes:

[0094] Air supply unit (air supply assembly 4) is used to supply the burner with the required compressed air and combustion gas;

[0095] A visual flame reaction protection shield 2 is used to confine the products of the flame synthesis burner in the pipe and to observe the situation after flame combustion.

[0096] Collection device (nanoparticle collection device 3); The collection device includes a collection component connected to the visible flame reaction protective cover. The collection part uses a vacuum pump to create a vacuum and uses the collection part to collect the flame synthesis products after combustion.

[0097] The dual-flame burner (dual-flame spray pyrolysis burner group 1) achieves symmetrical placement of dual-flame burners through structural design, and the composition and structure of nanoparticles can be controlled by adjusting the distance, height and angle between the burners.

[0098] Optionally, the air supply unit includes a gas cylinder, a gas circuit, and an air compressor. The gas cylinder is housed in a cylinder cabinet and connected via a gas circuit and flow meter, with a pressure gauge monitoring the gas circuit pressure in real time. The air compressor supplies the required air and is connected via a gas flow meter and burner.

[0099] Optionally, the visible flame reaction protection cover is a square cover with a glass viewing window, and the dual flame composite burner burns inside the visible flame reaction protection cover.

[0100] Optionally, the collection unit includes a vacuum pipe, one end of which is connected to the top outlet of the visible flame reaction protective hood, and the other end of which is connected to a particle filtration and collection device; a vacuum pump, which is connected to the rear end pipe of the particle filtration and collection device of the vacuum pipe, and is equipped with a pressure gauge to adjust the vacuum level, so as to control the airflow speed in the product recovery process.

[0101] Optionally, the dual-flame burner includes two identical burners and four support devices. The identical burners ensure a similar flame structure. The support devices are positioned between the experimental platform and the burners, serving to support the burners and adjust the combustion angle.

[0102] This embodiment also provides a method for adjusting the nanoparticles of flame-synthesized products. The method utilizes the dual-flame spray pyrolysis product collection device described above to collect the products. The method for adjusting the nanoparticles of flame-synthesized products includes: adjusting the height of the dual-flame support brackets and controlling the flame combustion angle of the dual flames by adjusting the angle of the fixing screws; adjusting the flame height and flame width generated by the flame burner according to the gas flow rate of the gas supply section to adjust the nanoparticles; adjusting the vacuum degree of the vacuum pump to control the vacuum degree in the pipeline to collect the synthesized products of the flame-synthesized burner, and cooling the products in the product collection section using the path of the vacuum pipeline; collecting the products after the vacuum degree stabilizes; stopping the vacuum pump after combustion is complete; and collecting the nanoparticles collected by the particle filtration collection device.

[0103] Example 8

[0104] The existing technology has the following problems: (1) the single-flame structure leads to uneven temperature distribution, affecting the uniformity and controllability of nanoparticles; (2) the recycling process of nanoparticles is inefficient, and some particles cannot be effectively collected, resulting in resource waste; (3) the modularity of the device is low, making it difficult to achieve full-process optimization from preparation to recycling. Therefore, there is an urgent need for an integrated device that can integrate spray pyrolysis and recycling functions to solve the above problems. Dual-flame spray pyrolysis is an important method for preparing nanoparticles, with high yield, fast reaction and low equipment requirements.

[0105] This embodiment provides an integrated device for synthesizing nanoparticles by dual-flame spray pyrolysis, including a gas supply unit (gas supply assembly 4), a visible flame reaction protection cover 2, a collection unit (nanoparticle collection device 3), and a dual-flame burner (dual-flame spray pyrolysis burner group 1).

[0106] The gas supply section is responsible for supplying the combustion gases and compressed air required by the burner.

[0107] A visible flame reaction protection shield is used to limit the concentration of combustion products in the pipe of a flame spray pyrolysis burner and to allow observation of the flame state.

[0108] The collection section includes a connector starting at the connection between the collection section and the protective cover for visual flame reaction, as well as a particulate filter collection device. A vacuum environment is formed between the collection section and the protective cover to collect the pyrolysis products of flame combustion.

[0109] A dual-flame burner is used to adjust the angle and distance of the burner, as well as the combustion atmosphere and temperature, to control the nanoparticles.

[0110] In the collection section, the particle filtration and collection device can utilize a cyclone dust collector or similar device, and can be configured according to the actual situation. The particle collector used in the following embodiments is used to collect the product and will be described.

[0111] Understandably, during the reaction process, the products formed by the dual-flame spray pyrolysis are mixed with the high-temperature flue gas formed after the combustion of the combustion gases. Therefore, in this embodiment, the high-temperature flue gas and products are cooled, and the controllable-length recovery path ensures that the products are sufficiently cooled before reaching the particle filter collection device. The dual-flame spray pyrolysis burner is completely enclosed by a visible flame reaction protective cover, effectively confining the combustion products within the cover and maximizing the product recovery rate. A vacuum is created between the collection section and the visible flame reaction protective cover, allowing the products to accurately fall into the particle filter collection device.

[0112] In this embodiment, the gas supply unit is a combination of a gas cylinder cabinet and an air compressor, which supplies the burner and air to the flame burner.

[0113] It is understood that the gas supply unit in this embodiment includes a gas cylinder and an air compressor. A pressure gauge controls the pipeline pressure, and a gas flow meter precisely controls the combustion gases and air. This allows for effective control of the flame height and width, achieving effective symmetry between the two flames.

[0114] In this embodiment, the visual flame reaction protection cover is a square technical device with a visual glass window, and the flames of the dual flame burners are completely burned within the visual flame reaction protection cover.

[0115] It is understood that the visualized flame reaction protection hood in this embodiment is a square technical device with a viewing glass window. The flames of the dual-flame burners are completely burned within it, and the combustion products are completely confined within the pipe. A particle filter collection device is used to separate, intercept, and collect particles in the flue gas. The visualized flame reaction protection hood isolates the flame from external air, preventing external air from entering the flame field during the reaction and affecting the reaction. It also effectively prevents particles after the reaction from diffusing into the air due to airflow and gravity, thus preventing product loss, low recovery rates, and air pollution, thereby improving the effective recovery of products. Furthermore, the device is equipped with a glass viewing window, which allows observation of the combustion status of the dual flames during combustion and whether it can respond promptly to changes in the gas supply flow rate. It also facilitates adjustment of the angle and height of the dual flames.

[0116] In this embodiment, the collection unit includes: a vacuum pipe, one end of which is connected to the top outlet of the visual flame synthesis protective cover, and the other end of which is connected to a particle filtration and collection device; and a vacuum pump, which is connected to the rear end pipe of the particle filtration and collection device of the vacuum pipe. The vacuum pump is equipped with a pressure gauge to adjust the vacuum level and facilitate control of the airflow speed during the product recovery process.

[0117] Understandably, the vacuum pipeline cools the reaction products and high-temperature flue gas, and also serves as a channel for product recovery. Different vacuum levels produced by the vacuum pump will generate different recovery gas flow rates.

[0118] In this embodiment, the collection unit further includes a particle filtration and collection device.

[0119] It is understood that the collection section may also include a particulate filter collection device; that is, in this embodiment, a particulate filter collection device may also be provided to separate and collect particles from the flue gas. Since there are sufficient cooling paths within the vacuum pipeline, the particulate filter collection device is designed to avoid being affected by the high-temperature flue gas.

[0120] In this embodiment, the dual-flame burner includes: two burners with identical structures, a protective gas inlet, a dispersion gas inlet, a combustion gas inlet disposed on both sides of the burner, a liquid feed inlet located at the lower end of the burner, and supporting components.

[0121] Understandably, this embodiment can include a support component below the burner, with fixing screws located on the outside of the burner for adjusting the burner's height and angle, and ensuring safe liquid injection via the liquid feed hose. A metal foam structure is also incorporated to achieve uniform flame surface.

[0122] The metal foam is embedded inside the burner, at the groove between the upper surface and the gas outlet. The use of metal foam can make the flame surface burn evenly and stably. The metal foam can be nickel-based or the like, without specific limitation. The following embodiments use nickel-based metal foam as an example for illustration.

[0123] It is understood that this embodiment can use a support device for support and adjustment. The adjusting member 116 is a connector responsible for connecting the burner and the bottom support (support member 115), primarily serving to adjust the burner angle, and features evenly distributed M6 threaded holes on its surface. The support member 115 connects the adjusting member 116 and the platform (operating table 5), serving to fix it on a stable experimental platform and also responsible for fixing the horizontal distance between the two burners, similarly featuring evenly distributed M6 threaded holes. This approach saves costs and simplifies adjustment while meeting the requirements for preparing different nanoparticles.

[0124] Specifically, the burner structure in this embodiment includes protective gas inlets, dispersion gas inlets, and combustion gas inlets located on both sides of the burner, as well as a liquid feed inlet at the bottom of the burner, and supporting components. In this embodiment, all inlet pipes have a uniform diameter and use common gas quick-connect valves for connection, facilitating changes in the gas path during adjustments to distance and angle, and avoiding hazards caused by changes in the burner's position. Inside the burner, all inlet paths are independent and do not interfere with each other. The liquid feed pipe has a separate diameter and connects to a flexible hose via a metal valve at the bottom. A flexible hose is used to connect the liquid feed pipe and the injection pump, allowing for easy movement with the burner during repositioning.

[0125] In this embodiment, the dual-flame burner also includes dual air intake paths, comprising multiple one-to-many conversion connectors. These connectors are directly connected to quick-connect interfaces on both sides of the burner, facilitating better mixing of combustion gas and compressed air. Furthermore, this embodiment eliminates the need for external atomizing nozzles; the internal structure of the burner allows for effective atomization and fragmentation of the liquid upon passing over its upper surface, followed by condensation and growth as it passes through the combustion zone.

[0126] In summary, the integrated device for synthesizing nanoparticles by dual-flame spray pyrolysis proposed in the embodiments can achieve controllable particle size and morphology of nanoparticles using dual flames; the use of a visualized flame synthesis protective cover isolates the flame spray pyrolysis products from the surrounding environment, reducing the loss of flame spray pyrolysis products; the application of a collection unit increases the cooling path of nanoparticles, improving the collection rate of flame spray pyrolysis products; and the application of a vacuum pipeline ensures that particles are effectively blocked at the particle filtration and collection device as they pass through the surrounding fluid, improving the working efficiency of the vacuum pump and simultaneously increasing the collection rate of flame spray pyrolysis products.

[0127] Figure 9 This is a schematic diagram of the integrated apparatus for synthesizing nanoparticles by dual-flame spray pyrolysis provided in this embodiment. This integrated apparatus utilizes all the aforementioned devices to perform the flame spray pyrolysis preparation of nanoparticles and the collection of nanoparticles, wherein the method includes the following steps:

[0128] In step S1, the angle and height of the dual-flame burner, as well as the distance between the two burners, are adjusted according to the expected design.

[0129] It is understood that the distance, height, and angle parameters in this embodiment can be adjusted to facilitate subsequent control over the composition and structure of the nanoparticles.

[0130] In step S2, the airflow and liquid speeds are adjusted according to the requirements of the nanoparticles, the height of a portion of the vacuum pipe between the visualized flame reaction protective cover and the particle filter collection assembly is adjusted, and the vacuum level of the vacuum pump is designed to collect the flame pyrolysis products.

[0131] It is understood that the parameters of the combustion reaction can be changed in this embodiment, and the final control of nanoparticles can be achieved through the combustion process, avoiding impurities and environmental pollution caused by combustion, and improving the purity of the final product.

[0132] In step S3, when the feed rate reaches the expected design, the flame combustion is stopped, and the product is collected by the particle filtration and recovery device.

[0133] It is understood that in this embodiment, the particle recovery device can be removed and the final product collected promptly after the injection process is completed. At this point, the combustion flame and injection can be terminated.

[0134] The integrated device for synthesizing nanoparticles via dual-flame spray pyrolysis proposed in this embodiment can prepare multi-component nanoparticles with simple operation, and the structure can be designed according to requirements, such as core-shell structures. Meanwhile, the vacuum pipeline is used to achieve the required cooling path for the nanoparticles, simplifying the integrated device.

[0135] In existing technologies, the single-flame structure leads to uneven temperature distribution, affecting the uniformity and controllability of nanoparticles, and resulting in low efficiency in the nanoparticle recycling process, with some particles failing to be effectively collected, causing resource waste. Furthermore, the low modularity of the device makes it difficult to optimize the entire process from preparation to recycling. This embodiment presents a dual-flame spray pyrolysis method, a highly efficient technique for nanoparticle preparation. It utilizes two overlapping flames to provide a uniform and high-temperature reaction environment, rapidly evaporating and decomposing the spray-like liquid precursor to form nanoparticles. This method allows for precise control of the temperature field and reaction rate by adjusting the flame angle and height. Dual-flame spray pyrolysis can precisely control the particle size, cleanliness, and purity of multi-component nanoparticles, rapidly synthesizing nanoparticles, and is suitable for preparing high-performance materials such as metal oxides, metal nanoparticles, and composite materials.

[0136] This invention allows for control of the composition and structure of the product by adjusting the height and angle of the dual-flame burner; reduces the loss of particulate products from flame synthesis by using a visual flame synthesis protective cover; controls the flame by visually adjusting the flame height; and improves the collection efficiency of particulate products from dual-flame synthesis by using a collection unit.

[0137] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A dual-flame spray pyrolysis system for synthesizing nanoparticles, characterized in that, It includes a dual-flame spray pyrolysis burner assembly (1), a visible flame reaction protection shield (2), and a nanoparticle collection device (3); The dual-flame spray pyrolysis burner assembly (1) is set inside the visual flame reaction protection hood (2) and includes two spray pyrolysis burners set at an angle. The nanoparticle collection device (3) includes a vacuum pipe (31) and a particle filter collection assembly (32) set on the vacuum pipe (31). The vacuum pipe (31) is connected to the visual flame reaction protection hood (2).

2. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 1, characterized in that, The spray pyrolysis burner includes a main body (11) and a combustion gas inlet (12), a dispersion gas inlet (13), a protective gas inlet (14), and a solution inlet (15) opened on the main body (11); The combustion gas inlet (12) is connected to the combustion gas outlet (17) through the combustion gas pipeline (16), the dispersion gas inlet (13) is connected to the dispersion gas outlet (19) through the dispersion gas pipeline (18), the protective gas inlet (14) is connected to the protective gas outlet (111) through the protective gas pipeline (110), and the solution inlet (15) is connected to the solution outlet (113) through the solution pipeline (112). The combustion gas outlet (17), protective gas outlet (111) and solution outlet (113) are located on the upper end face of the main body (11), and the dispersion gas outlet (19) is connected to the solution outlet (113).

3. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 2, characterized in that, The main body (11) has a rotating structure, and the combustion gas inlet (12), the dispersion gas inlet (13) and the protective gas inlet (14) are spaced apart on the side of the main body (11) along the axis of the main body (11).

4. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 3, characterized in that, The protective gas inlet (14), the combustion gas inlet (12), and the dispersion gas inlet (13) are arranged sequentially at intervals along the axis of the main body (11); The protective gas outlet (111) is arranged around the outside of the combustion gas outlet (17), the combustion gas outlet (17) is arranged around the outside of the solution outlet (113), and the dispersion gas outlet (19) is arranged inside the main body (11) and connected to the solution outlet (113).

5. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 2, characterized in that, The spray pyrolysis burner also includes a support adjustment device for supporting and adjusting the height and angle of the main body (11).

6. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 1, characterized in that, The visible flame reaction protective cover (2) is a protective cover with a glass viewing window, and contains an igniter (21).

7. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 1, characterized in that, One end of the vacuum pipe (31) is connected to the top outlet of the visual flame reaction protection shield (2), and the other end is connected to the vacuum pump (33). The end of the vacuum pipe (31) connected to the top outlet of the visual flame reaction protection shield (2) is provided with a tapering structure.

8. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 1, characterized in that, It also includes a gas supply assembly (4) for supplying the required gas to the dual-flame spray pyrolysis burner assembly (1).

9. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 8, characterized in that, The gas supply assembly (4) includes a gas cylinder (41), an air compressor (42), and a gas flow meter (43). The gas cylinder (41) and the air compressor (42) are connected to the air inlet of the spray pyrolysis burner through a pipeline, and a gas flow meter (43) is provided on the pipeline.

10. The dual-flame spray pyrolysis synthesis system for nanoparticles according to claim 1, characterized in that, It also includes a liquid supply assembly for supplying the required metal salt or organic precursor solution to the dual-flame spray pyrolysis burner assembly (1).

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