Integrated efficient nano-powder flame synthesis combustion system capable of reducing wall surface adhesion

Abstract

The invention discloses an integrated efficient nano-powder flame synthesis combustion system capable of reducing wall adhesion, which comprises an atomization combustion body (1), an inlet gas film body (2), a middle section gas film body (3) and an outlet gas film body (4), and is characterized in that the atomization combustion body (1) is integrally and fixedly arranged in the central bottom area of the inlet gas film body (2); and the inlet gas film body (2), the middle section gas film body (3) and the outlet gas film body (4) are coaxially connected and communicated from bottom to top. According to the integrated efficient nano-powder flame synthesis combustion system capable of reducing wall surface adhesion, compact integration of the synthesis process of a nano-powder material can be achieved, the wall surface adhesion effect of the nano-powder material is reduced while the yield of nano-powder is increased, and the production efficiency of the nano-powder material is improved. The device has the characteristics of rapid synthesis of nano particles, high integration, small occupied space and avoidance of wall surface adhesion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of preparing nano-powder materials by using flame synthesis method, and particularly relates to an integrated high-efficiency nano-powder flame synthesis combustion system capable of reducing wall adhesion. BACKGROUND

[0002] The flame synthesis method refers to that a precursor is transported to a high-temperature flame field formed by a burner through gasification or atomization by a carrier gas, and then a nano-powder material is prepared through a series of complex physical changes and chemical reaction processes, which has the advantage of one-step synthesis and is one of important methods for modern industrial scale preparation of high-performance powder materials. At present, in order to meet the demand for scale preparation of nano-powder materials, the method of connecting multiple flame synthesis burners in parallel in the flame synthesis process is often used, which can meet the demand for scale preparation of nano-powder materials to a certain extent, but this process route still has several obvious deficiencies, including: 1) Each burner in the process system needs to be regulated, which increases the regulation difficulty and workload, and the regulation efficiency is low; 2) The replacement efficiency of any atomization and synthesis burner unit is low under specific requirements; 3) The overall process system is complex and has poor integration, resulting in a large floor space of the overall equipment. In addition, in the process of flame synthesis of nano-powder, the nano-powder is easy to adhere to the wall due to its large specific surface area, which causes waste of nano-powder and increases the time cost and labor consumption for wall cleaning. SUMMARY

[0003] The main purpose of the present application is to provide an integrated high-efficiency nano-powder flame synthesis combustion system capable of reducing wall adhesion, which can realize compact integration of the nano-powder material synthesis process, increase the yield of nano-powder, reduce the wall adhesion effect of nano-powder materials, and has the characteristics of rapid synthesis of nano-particle materials, high integration, small floor space, and avoidance of wall adhesion.

[0004] To achieve the above purpose, the present application provides an integrated high-efficiency nano-powder flame synthesis combustion system capable of reducing wall adhesion, which comprises an atomization combustion body (1), an inlet gas film body (2), a middle gas film body (3), and an outlet gas film body (4). The atomization combustion body (1) is fixedly arranged at the center bottom region of the inlet gas film body (2), and the inlet gas film body (2), the middle gas film body (3), and the outlet gas film body (4) are coaxially connected and communicated from bottom to top, wherein: The atomized combustion body (1) comprises synthetic burner monomers (11), an outer shell (12), an outer cavity (13), an inner shell (14), a precursor delivery cavity (15), a shearing gas delivery cavity (16), an inner layer gas inlet (17) and an outer layer gas inlet (18), each of the synthetic burner monomers (11) comprises an atomizing nozzle (111), an inner tube (112), an outer tube (113), a shearing gas tube (114) and a precursor tube (115), the atomized combustion body (1) integrates a plurality of synthetic burner monomers (11) to realize precise feeding of liquid precursor atomization, fuel and air, and construct a plurality of groups of atomized synthetic flames; The inlet gas film body (2) comprises an inlet gas film tube (21), an inlet honeycomb body (22), an inlet flow uniformizing cylinder (23) and an inlet gas film shell (24), air is input through the inlet gas film tube (21), flows uniformly through the inlet flow uniformizing cylinder (23) and the inlet honeycomb body (22), and then forms a bottom gas protection film on the inner wall of the cavity to block the adhesion of nano powder in the bottom area; The middle section gas film body (3) comprises a middle section gas film tube (31), a middle section honeycomb body (32), a middle section flow uniformizing cylinder (33) and a middle section gas film shell (34), air is input through the middle section gas film tube (31), flows uniformly through the middle section flow uniformizing cylinder (33) and the middle section honeycomb body (32), and then forms a middle section gas protection film on the inner wall of the cavity to block the adhesion of nano powder in the middle section area; The outlet gas film body (4) comprises an outlet gas film tube (41), an outlet honeycomb body (42), an outlet flow uniformizing cylinder (43) and an outlet gas film shell (44), air is input through the outlet gas film tube (41), flows uniformly through the outlet flow uniformizing cylinder (43) and the outlet honeycomb body (42), and then forms a top gas protection film on the inner wall of the cavity to block the adhesion of nano powder in the outlet area.

[0005] As a further preferred technical solution of the above technical solution, the inner shell (14) is an axisymmetric shell structure, the lower part of the inner shell (14) is a bottom-closed cylindrical shell, the middle part of the inner shell (14) is a frustum-shaped shell with a gradually reduced cross-sectional area from bottom to top, and the upper part of the inner shell (14) is also a frustum-shaped shell with a gradually reduced cross-sectional area from bottom to top; the inclination angle of the middle part of the inner shell (14) is greater than that of the upper part of the inner shell (14); On the outer side of the upper part of the inner shell (14), the outer shell (12) is coaxially sleeved with the inner shell (14); The outer shell (12) is an axisymmetric shell structure. The lower part of the outer shell (12) is a cylindrical shell with a closed bottom. The middle part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The upper part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The inclination angle of the frustum-shaped shell in the middle part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the middle part of the outer shell (12). The inclination angle of the frustum-shaped shell in the upper part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the upper part of the outer shell (12). The outer cavity (13) is formed between the outer wall of the inner shell (14) and the inner wall of the outer shell (12); the outer cavity (13) is used for airflow and distribution. Both the inner gas inlet (17) and the outer gas inlet (18) are cylindrical structures; the inner gas inlet (17) is vertically fixed to the lower cylindrical part of the inner shell (14), and is connected and communicates with the inner shell (14); the outer gas inlet (18) is vertically fixed to the lower cylindrical part of the outer shell (12), and is connected and communicates with the outer shell (12); the inner gas inlet (17) is used for the flow of fuel gas, and the outer gas inlet (18) is used for the flow of air. The shear gas delivery chamber (16) is a cylindrical body and is fixedly installed at the center of the bottom wall of the inner shell (14); The precursor delivery chamber (15) is an annular cylinder, coaxially sleeved on the outside of the shear gas delivery chamber (16), and also fixed to the bottom wall of the inner shell (14); at the lower ends of the precursor delivery chamber (15) and the shear gas delivery chamber (16), a precursor inlet pipe and an air flow inlet pipe are respectively provided.

[0006] As a further preferred technical solution of the above technical solution, the atomizing nozzle (111) is used to break up and atomize the continuous phase liquid precursor into droplets by means of high-speed shearing airflow and spray them out as a high-speed jet. The inner tube (112) and the outer tube (113) are both straight tube structures. The inner tube (112) and the outer tube (113) are coaxially sleeved on the outside of the atomizing nozzle (111) from the inside to the outside. One end of the inner tube (112) is vertically fixed to the wall of the outer shell (12), and the other end passes through the wall of the inner shell (14) and extends into the interior of the inner shell (14); one end of the outer tube (113) is vertically fixed to the wall of the outer shell (12), and the other end extends into the interior of the outer cavity (13); The shearing air tube (114) is a flexible tube; one end of each shearing air tube (114) is connected to the shearing air interface of the corresponding atomizing nozzle (111), and the other end is connected to the shearing air delivery chamber (16). The precursor tube (115) is a flexible tube; one end of each precursor tube (115) is connected to the precursor interface at the center of the corresponding atomizing nozzle (111), and the other end is connected to the precursor delivery chamber (15).

[0007] As a further preferred technical solution of the above technical solution, the inlet honeycomb body (22) is composed of honeycomb material; and the inlet honeycomb body (22) is coaxially connected by an expanding conical cylinder that gradually increases in size from bottom to top at the lower end and a cylindrical cylinder at the upper end. The inlet air film shell (24) is composed of a cylindrical body and annular sealing plates at the bottom and top; the inlet air film shell (24) is coaxially sleeved on the outside of the inlet honeycomb body (22), thereby forming an annular airflow chamber between the inner wall of the inlet air film shell (24) and the wall of the inlet honeycomb body (22); The atomizing combustion body (1) passes through the bottom annular sealing plate of the inlet gas film shell (24) and is fixed to the annular sealing plate; The inlet air film pipe (21) is a circular pipe structure, which is fixed perpendicularly to the wall of the inlet air film shell (24), connected and communicated, and each inlet air film pipe (21) is located in the axial middle part of the inlet air film shell (24); The inlet equalization cylinder (23) is a cylindrical structure, and the axial length of the inlet equalization cylinder (23) is greater than the outer diameter of the inlet air film pipe (21). The inlet equalization cylinder (23) is coaxially sleeved on the outside of the inlet honeycomb body (22) and located inside the inlet air film shell (24). The inlet equalization cylinder (23) is directly opposite the outlet of the inlet air film pipe (21) and is located close to the inlet air film pipe (21). The inlet equalization cylinder (23) is fixed to the inlet air film shell (24) by fixing ribs.

[0008] As a further preferred technical solution of the above technical solution, the middle honeycomb body (32) is composed of honeycomb material; the middle honeycomb body (32) is a cylindrical structure; The middle section air film shell (34) is composed of a cylindrical body and annular sealing plates at the bottom and top; the middle section air film shell (34) is coaxially sleeved on the outside of the middle section honeycomb body (32), thereby forming an annular airflow chamber between the inner wall of the middle section air film shell (34) and the wall of the middle section honeycomb body (32); The middle section air film tube (31) is a circular tube structure, which is fixed perpendicularly to the wall of the middle section air film shell (34), connected and communicated, and each of the middle section air film tubes (31) is located in the axial middle part of the middle section air film shell (34); The middle section flow equalization cylinder (33) is a cylindrical structure, and the axial length of the middle section flow equalization cylinder (33) is greater than the outer diameter of the middle section air film pipe (31). The middle section flow equalization cylinder (33) is coaxially sleeved on the outside of the middle section honeycomb body (32) and located inside the middle section air film shell (34). The middle section flow equalization cylinder (33) is directly opposite the outlet of the middle section air film pipe (31) and is located near the inlet air film pipe (21). The middle section flow equalization cylinder (33) is fixed to the middle section air film shell (34) by fixing ribs.

[0009] As a further preferred technical solution of the above technical solution, the outlet honeycomb body (42) is composed of honeycomb material (with a certain thickness); and the outlet honeycomb body (42) is composed of a tapered cylinder that gradually decreases in size from bottom to top; The outlet air film shell (44) is composed of a cylindrical body and annular sealing plates at the bottom and top; the outlet air film shell (44) is coaxially sleeved on the outside of the outlet honeycomb body (42), thereby forming an annular airflow chamber between the inner wall of the outlet air film shell (44) and the wall of the outlet honeycomb body (42); The outlet air film pipe (41) is a circular pipe structure, which is fixed perpendicularly to the wall of the outlet air film shell (44), connected and communicated, and each outlet air film pipe (41) is located in the axial middle part of the outlet air film shell (44). The outlet flow equalization cylinder (43) is a cylindrical structure. The axial length of the outlet flow equalization cylinder (43) is greater than the outer diameter of the outlet air film pipe (41). The outlet flow equalization cylinder (43) is coaxially sleeved on the outside of the outlet honeycomb body (42) and located inside the outlet air film shell (44). The outlet flow equalization cylinder (43) is directly opposite the outlet of the outlet air film pipe (41) and is located close to the outlet air film pipe (41). The outlet flow equalization cylinder (43) is fixed to the outlet air film shell (44) by fixing ribs.

[0010] As a further preferred technical solution to the above technical solution, the system's working process is specifically implemented as follows: The continuous phase liquid precursor flows in through the bottom inlet of the precursor delivery chamber (15). Under the stabilizing and uniform distribution effect of the precursor delivery chamber (15), the precursor flows into each of the precursor tubes (115) and then into each of the corresponding atomizing nozzles (111). The shear gas flows in through the bottom inlet of the shear gas delivery chamber (16). Under the stabilizing and uniform distribution effect of the shear gas delivery chamber (16), the shear gas flows into each of the shear gas tubes (114) and then into each of the corresponding atomizing nozzles (111). Under the action of the centrally injected precursor and the outer shear gas, an atomized precursor jet is formed at the upper part of the outlet of the atomizing nozzle (111). The fuel gas flows in through the inner gas inlet (17), and then, inside the inner shell (14), after being stabilized and distributed by the airflow, it is ejected at high speed through the airflow channels formed between the outer wall of the atomizing nozzle (111) and the inner wall of the inner tube (112); the air flows in through the outer gas inlet (18), and then, inside the outer cavity (13), after being stabilized and distributed by the airflow, it is ejected at high speed through the airflow channels formed between the outer wall of the inner tube (112) and the inner wall of the outer tube (113); through the above combustion organization, an atomized flame is constructed from the airflow, fuel gas flow and central atomizing jet to the outside; At the same time, a portion of the airflow at the bottom flows in through the inlet air film pipe (21) and then directly impacts the inlet flow equalization cylinder (23). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the inlet flow equalization cylinder (23), the airflow flows into the pore structure of the inlet honeycomb body (22) and then flows out from the inner wall of the inlet honeycomb body (22), thereby forming a bottom gas protective film on the inner wall of the inlet honeycomb body (22). A portion of the airflow in the middle section flows in through the middle section air film tube (31) and then directly impacts the middle section flow equalization tube (33). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the middle section flow equalization tube (33), the airflow flows into the pore structure of the middle section honeycomb body (32) and then flows out from the inner wall of the middle section honeycomb body (32), thereby forming a middle gas protective film on the inner wall of the middle section honeycomb body (32). A portion of the airflow at the top flows in through the outlet air film pipe (41) and then directly impacts the outlet flow equalizer (43). The airflow flows in all directions, up, down, left, and right. Under the flow equalization effect of the outlet flow equalizer (43), the airflow flows into the pore structure of the outlet honeycomb body (42) and then flows out from the inner wall of the outlet honeycomb body (42), thereby forming a top gas protective film on the inner wall of the outlet honeycomb body (42).

[0011] The beneficial effects of this invention are as follows: (1) The present invention can achieve a dense air film layer near the wall by constructing an inlet air film body, a middle section air film body and an outlet air film body, which can directly prevent the adhesion of high temperature nanoparticles. (2) By constructing a single atomizing burner, the present invention can simultaneously construct atomizing synthesis flames of multiple independent units, thereby increasing the synthesis yield of nanopowders while ensuring a compact structure. (3) Since the outer shell (12) and the inner shell (14) are stepped structures as a whole, and the surrounding synthesis burner unit (11) is arranged outward, the mutual interference between the central atomizing flame and the surrounding atomizing flame during the synthesis process can be reduced, which is beneficial to obtaining stable high-performance nanopowder materials under large synthesis conditions. Attached Figure Description

[0012] Figure 1 This is a side view of the present invention.

[0013] Figure 2 This is a top view of the present invention.

[0014] Figure 3 yes Figure 1 A cross-sectional view along the AA direction.

[0015] Figure 4 yes Figure 2 A cross-sectional view along the BB direction.

[0016] Figure 5 This is a side view of the atomizing combustion body of the present invention.

[0017] Figure 6 This is an axial cross-sectional view of the atomizing combustion body of the present invention.

[0018] Figure 7 This is a schematic diagram of the airflow of the atomized combustion body of the present invention.

[0019] Figure 8 This is a schematic diagram of the overall airflow of the present invention.

[0020] The reference numerals in the attached drawings include: 1-atomizing burner, 11-combination burner unit, 111-atomizing nozzle, 112-inner tube, 113-outer tube, 114-shear gas tube, 115-precursor tube, 12-outer shell, 13-outer cavity, 14-inner shell, 15-precursor delivery cavity, 16-shear gas delivery cavity, 17-inner gas inlet, 18-outer gas inlet, 2-inlet film gas body, 21-inlet film gas tube, 22-inlet honeycomb body, 23-inlet flow equalization cylinder, 24-inlet film gas shell, 3-middle section film gas body, 31-middle section film gas tube, 32-middle section honeycomb body, 33-middle section flow equalization cylinder, 34-middle section film gas shell, 4-outlet film gas body, 41-outlet film gas tube, 42-outlet honeycomb body, 43-outlet flow equalization cylinder, 44-outlet film gas shell. Detailed Implementation

[0021] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0022] In the preferred embodiments of the present invention, those skilled in the art should note that the liquid precursors and the like involved in the present invention can be considered as prior art.

[0023] Preferred embodiment.

[0024] like Figures 1-8 As shown, this invention discloses an integrated high-efficiency nanopowder flame synthesis combustion system for reducing wall adhesion, comprising an atomizing burner (1), an inlet gas film body (2), a middle gas film body (3), and an outlet gas film body (4). The atomizing burner (1) is fixedly disposed in the central bottom region of the inlet gas film body (2), and the inlet gas film body (2), the middle gas film body (3), and the outlet gas film body (4) are coaxially connected and communicate from bottom to top, wherein: The atomizing burner (1) includes a synthetic burner unit (11), an outer shell (12), an outer cavity (13), an inner shell (14), a precursor delivery cavity (15), a shear gas delivery cavity (16), an inner gas inlet (17), and an outer gas inlet (18). Each synthetic burner unit (11) includes an atomizing nozzle (111), an inner tube (112), an outer tube (113), a shear gas pipe (114), and a precursor pipe (115). The atomizing burner (1) integrates multiple synthetic burner units (11) to achieve liquid precursor atomization and precise fuel and air supply, and to construct multiple sets of atomized synthetic flames. The inlet air film body (2) includes an inlet air film pipe (21), an inlet honeycomb body (22), an inlet flow equalization cylinder (23), and an inlet air film shell (24). Air is introduced through the inlet air film pipe (21), and after being evenly distributed by the inlet flow equalization cylinder (23) and guided by the inlet honeycomb body (22), a bottom gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the bottom area. The middle section air film body (3) includes a middle section air film tube (31), a middle section honeycomb body (32), a middle section flow equalization tube (33), and a middle section air film shell (34). Air is introduced through the middle section air film tube (31), and after being evenly distributed by the middle section flow equalization tube (33) and guided by the middle section honeycomb body (32), a middle gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the middle section area. The outlet air film body (4) includes an outlet air film pipe (41), an outlet honeycomb body (42), an outlet flow equalization cylinder (43), and an outlet air film shell (44). Air is introduced through the outlet air film pipe (41), and after being evenly distributed by the outlet flow equalization cylinder (43) and guided by the outlet honeycomb body (42), a top gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the outlet area.

[0025] Specifically, the inner shell (14) is an axisymmetric shell structure. The lower part of the inner shell (14) is a cylindrical shell with a closed bottom. The middle part of the inner shell (14) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The upper part of the inner shell (14) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The tilt angle of the middle frustum-shaped shell of the inner shell (14) is much greater than the tilt angle of the upper frustum-shaped shell. On the upper outer side of the inner shell (14), the outer shell (12) is coaxial with the inner shell (14) and sleeved thereon. The outer shell (12) is an axisymmetric shell structure. The lower part of the outer shell (12) is a cylindrical shell with a closed bottom. The middle part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The upper part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The inclination angle of the frustum-shaped shell in the middle part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the middle part of the outer shell (12). The inclination angle of the frustum-shaped shell in the upper part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the upper part of the outer shell (12). The outer cavity (13) is formed between the outer wall of the inner shell (14) and the inner wall of the outer shell (12); the outer cavity (13) is used for airflow and distribution. Both the inner gas inlet (17) and the outer gas inlet (18) are cylindrical structures; the inner gas inlet (17) is vertically fixed to the lower cylindrical part of the inner shell (14), and is connected and communicates with the inner shell (14); the outer gas inlet (18) is vertically fixed to the lower cylindrical part of the outer shell (12), and is connected and communicates with the outer shell (12); the inner gas inlet (17) is used for the flow of fuel gas, and the outer gas inlet (18) is used for the flow of air. The shear gas delivery chamber (16) is a cylindrical body and is fixedly installed at the center of the bottom wall of the inner shell (14); The precursor delivery chamber (15) is an annular cylinder, coaxially sleeved on the outside of the shear gas delivery chamber (16), and also fixed to the bottom wall of the inner shell (14); at the lower ends of the precursor delivery chamber (15) and the shear gas delivery chamber (16), a precursor inlet pipe and an air flow inlet pipe are respectively provided.

[0026] More specifically, (the number of the composite burner units (11) is preferably 5, wherein 1 composite burner unit (11) passes through the center of the upper end face of the outer shell (12) and the inner shell (14) in sequence and is sealed and fixed at the center; the other 4 composite burner units (11) are evenly arranged along the circumferential direction at the middle frustum-shaped inclined wall of the outer shell (12), and similarly, the 4 composite burner units (11) pass through the outer shell (12) and the inner shell (14) in sequence and are sealed and fixed at the shell wall). The atomizing nozzle (111) is used to break down and atomize the continuous phase liquid precursor into droplets and eject them as a high-speed jet by means of high-speed shearing airflow. The inner tube (112) and the outer tube (113) are both straight tube structures. The inner tube (112) and the outer tube (113) are coaxially sleeved on the outside of the atomizing nozzle (111) from the inside to the outside. One end of the inner tube (112) is vertically fixed to the wall of the outer shell (12), and the other end passes through the wall of the inner shell (14) and extends into the interior of the inner shell (14); one end of the outer tube (113) is vertically fixed to the wall of the outer shell (12), and the other end extends into the interior of the outer cavity (13); The shearing air tube (114) is a flexible tube (preferably 4 tubes); one end of each shearing air tube (114) is connected to the shearing air interface of the corresponding atomizing nozzle (111), and the other end is connected to the shearing air delivery chamber (16). The precursor tube (115) is a flexible tube structure (preferably 4 tubes); one end of each precursor tube (115) is connected to the precursor interface at the center of the corresponding atomizing nozzle (111), and the other end is connected to the precursor delivery chamber (15).

[0027] Furthermore, the inlet honeycomb body (22) is composed of honeycomb material (with a certain thickness); and the inlet honeycomb body (22) is coaxially connected by an expanding conical cylinder that gradually increases in size from bottom to top at the bottom and a cylindrical cylinder at the top. The inlet air film shell (24) is composed of a cylindrical body and annular sealing plates at the bottom and top; the inlet air film shell (24) is coaxially sleeved on the outside of the inlet honeycomb body (22), thereby forming an annular airflow chamber between the inner wall of the inlet air film shell (24) and the wall of the inlet honeycomb body (22); The atomizing combustion body (1) passes through the bottom annular sealing plate of the inlet gas film shell (24) and is fixed to the annular sealing plate; The inlet air film tube (21) is a circular tube structure (preferably 2), which is fixed perpendicularly to the wall of the inlet air film shell (24), connected and communicated, and each inlet air film tube (21) is located in the axial middle part of the inlet air film shell (24) (the 2 inlet air film tubes (21) are arranged opposite to each other). The inlet equalization cylinder (23) is a cylindrical structure with a certain axial length. The axial length of the inlet equalization cylinder (23) is greater than the outer diameter of the inlet air film pipe (21). The inlet equalization cylinder (23) is coaxially sleeved on the outside of the inlet honeycomb body (22) and located inside the inlet air film shell (24). The inlet equalization cylinder (23) is directly opposite the outlet of the inlet air film pipe (21) and is located close to the inlet air film pipe (21). The inlet equalization cylinder (23) can be fixed to the inlet air film shell (24) by fixing ribs.

[0028] Furthermore, the middle honeycomb structure (32) is composed of honeycomb material (with a certain thickness); the middle honeycomb structure (32) is a cylindrical structure; The middle section air film shell (34) is composed of a cylindrical body and annular sealing plates at the bottom and top; the middle section air film shell (34) is coaxially sleeved on the outside of the middle section honeycomb body (32), thereby forming an annular airflow chamber between the inner wall of the middle section air film shell (34) and the wall of the middle section honeycomb body (32); The middle section air film tube (31) is a circular tube structure (preferably 2), which is fixed perpendicularly to the wall of the middle section air film shell (34), connected and communicated, and each of the middle section air film tubes (31) is located in the axial middle part of the middle section air film shell (34) (the two middle section air film tubes (31) are arranged opposite each other). The middle section flow equalization cylinder (33) is a cylindrical structure (with a certain axial length). The axial length of the middle section flow equalization cylinder (33) is greater than the outer diameter of the middle section air film pipe (31). The middle section flow equalization cylinder (33) is coaxially sleeved on the outside of the middle section honeycomb body (32) and located inside the middle section air film shell (34). The middle section flow equalization cylinder (33) is directly opposite the outlet of the middle section air film pipe (31) and is located near the inlet air film pipe (21). The middle section flow equalization cylinder (33) can be fixed to the middle section air film shell (34) by fixing ribs.

[0029] Preferably, the outlet honeycomb body (42) is composed of honeycomb material (with a certain thickness); and the outlet honeycomb body (42) is composed of a tapered cylinder that gradually decreases in size from bottom to top; The outlet air film shell (44) is composed of a cylindrical body and annular sealing plates at the bottom and top; the outlet air film shell (44) is coaxially sleeved on the outside of the outlet honeycomb body (42), thereby forming an annular airflow chamber between the inner wall of the outlet air film shell (44) and the wall of the outlet honeycomb body (42); The outlet air film pipe (41) is a circular pipe structure (there are 2 of them), which is fixed perpendicularly to the wall of the outlet air film shell (44), connected and communicated, and each outlet air film pipe (41) is located in the axial middle part of the outlet air film shell (44) (the 2 outlet air film pipes (41) are arranged opposite each other). The outlet flow equalization cylinder (43) is a cylindrical structure (with a certain axial length). The axial length of the outlet flow equalization cylinder (43) is greater than the outer diameter of the outlet air film pipe (41). The outlet flow equalization cylinder (43) is coaxially sleeved on the outside of the outlet honeycomb body (42) and located inside the outlet air film shell (44). The outlet flow equalization cylinder (43) is directly opposite the outlet of the outlet air film pipe (41) and is located close to the outlet air film pipe (41). The outlet flow equalization cylinder (43) can be fixed to the outlet air film shell (44) by fixing ribs.

[0030] Preferably, the system's working process is specifically implemented as follows: A continuous phase liquid precursor flows in through the bottom inlet of the precursor delivery chamber (15). Under the stabilizing and uniform distribution effect of the precursor delivery chamber (15), the precursor flows into each of the precursor tubes (115) and then into each of the corresponding atomizing nozzles (111). A shear gas flow (mainly air) flows in through the bottom inlet of the shear gas delivery chamber (16). Under the stabilizing and uniform distribution effect of the shear gas delivery chamber (16), the shear gas flows into each of the shear gas tubes (114) and then into each of the corresponding atomizing nozzles (111). Under the action of the centrally injected precursor and the outer shear gas, an atomized precursor jet is formed and ejected from the upper part of the outlet of the atomizing nozzle (111). At the same time, fuel gas (mainly methane or other combustible gases) is injected through the inner gas inlet ( 17) The air flows in and then, inside the inner shell (14), after the airflow is stabilized and distributed, it is ejected at high speed through the airflow channel formed between the outer wall of the atomizing nozzle (111) and the inner wall of the inner tube (112); the air flows in through the outer air inlet (18) and then, inside the outer cavity (13), after the airflow is stabilized and distributed, it is ejected at high speed through the airflow channel formed between the outer wall of the inner tube (112) and the inner wall of the outer tube (113); through the above combustion organization, an atomized composite flame of airflow, fuel flow and central atomized jet is constructed (through the spatial arrangement of 5 atomizing burners (1), an atomized composite flame is further constructed at the center, and 4 atomized composite flames are wrapped around it); At the same time, a portion of the airflow at the bottom flows in through the inlet air film pipe (21) and then directly impacts the inlet flow equalization cylinder (23). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the inlet flow equalization cylinder (23), the airflow (will flow more evenly) into the pore structure of the inlet honeycomb body (22) and then flows out from the inner wall of the inlet honeycomb body (22), thereby forming a bottom gas protective film on the inner wall of the inlet honeycomb body (22). A portion of the airflow in the middle section flows in through the middle section air film tube (31) and then directly impacts the middle section flow equalization tube (33). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the middle section flow equalization tube (33), the airflow (will flow more evenly) into the pore structure of the middle section honeycomb body (32) and then flows out from the inner wall of the middle section honeycomb body (32), thereby forming a middle gas protective film on the inner wall of the middle section honeycomb body (32). A portion of the airflow at the top flows in through the outlet air film pipe (41) and then directly impacts the outlet flow equalizer (43). The airflow flows in all directions, up, down, left, and right. Under the flow equalization effect of the outlet flow equalizer (43), the airflow flows into the pore structure of the outlet honeycomb (42) more evenly and then flows out from the inner wall of the outlet honeycomb (42), thereby forming a top gas protective film on the inner wall of the outlet honeycomb (42).

[0031] The bottom, middle, and top gas protective films constructed above can effectively prevent the adhesion and deposition of nanoparticles generated by the atomized synthesis flame at the center from reaching the walls of the surrounding chambers. Furthermore, the gas flow ratios of the bottom, middle, and top gases can be adjusted according to the nanoparticle synthesis process and concentration distribution to flexibly regulate different operating conditions.

[0032] It is worth mentioning that the technical features such as liquid precursors involved in this patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated in detail.

[0033] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. An integrated, high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion, characterized in that, It includes an atomizing combustion body (1), an inlet gas film body (2), a middle gas film body (3), and an outlet gas film body (4). The atomizing combustion body (1) is fixedly disposed in the central bottom area of ​​the inlet gas film body (2), and the inlet gas film body (2), the middle gas film body (3), and the outlet gas film body (4) are coaxially connected and interconnected from bottom to top. The atomizing burner (1) includes a synthetic burner unit (11), an outer shell (12), an outer cavity (13), an inner shell (14), a precursor delivery cavity (15), a shear gas delivery cavity (16), an inner gas inlet (17), and an outer gas inlet (18). Each synthetic burner unit (11) includes an atomizing nozzle (111), an inner tube (112), an outer tube (113), a shear gas pipe (114), and a precursor pipe (115). The atomizing burner (1) integrates multiple synthetic burner units (11) to achieve liquid precursor atomization and precise fuel and air supply, and to construct multiple sets of atomized synthetic flames. The inlet air film body (2) includes an inlet air film pipe (21), an inlet honeycomb body (22), an inlet flow equalization cylinder (23), and an inlet air film shell (24). Air is introduced through the inlet air film pipe (21), and after being evenly distributed by the inlet flow equalization cylinder (23) and guided by the inlet honeycomb body (22), a bottom gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the bottom area. The middle section air film body (3) includes a middle section air film tube (31), a middle section honeycomb body (32), a middle section flow equalization tube (33), and a middle section air film shell (34). Air is introduced through the middle section air film tube (31), and after being evenly distributed by the middle section flow equalization tube (33) and guided by the middle section honeycomb body (32), a middle gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the middle section area. The outlet air film body (4) includes an outlet air film pipe (41), an outlet honeycomb body (42), an outlet flow equalization cylinder (43), and an outlet air film shell (44). Air is introduced through the outlet air film pipe (41), and after being evenly distributed by the outlet flow equalization cylinder (43) and guided by the outlet honeycomb body (42), a top gas protective film is formed on the inner wall of the cavity to prevent the adhesion of nanoparticles in the outlet area.

2. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 1, characterized in that, The inner shell (14) is an axisymmetric shell structure. The lower part of the inner shell (14) is a cylindrical shell with a closed bottom. The middle part of the inner shell (14) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The upper part of the inner shell (14) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The inclination angle of the middle frustum-shaped shell of the inner shell (14) is greater than the inclination angle of the upper frustum-shaped shell. On the upper outer side of the inner shell (14), the outer shell (12) is coaxial with the inner shell (14) and sleeved thereon. The outer shell (12) is an axisymmetric shell structure. The lower part of the outer shell (12) is a cylindrical shell with a closed bottom. The middle part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The upper part of the outer shell (12) is a frustum-shaped shell with a gradually decreasing cross-sectional area from bottom to top. The inclination angle of the frustum-shaped shell in the middle part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the middle part of the outer shell (12). The inclination angle of the frustum-shaped shell in the upper part of the inner shell (14) is equal to the inclination angle of the frustum-shaped shell in the upper part of the outer shell (12). The outer cavity (13) is formed between the outer wall of the inner shell (14) and the inner wall of the outer shell (12); the outer cavity (13) is used for airflow and distribution. Both the inner gas inlet (17) and the outer gas inlet (18) are cylindrical structures; the inner gas inlet (17) is vertically fixed to the lower cylindrical part of the inner shell (14), and is connected and communicates with the inner shell (14); the outer gas inlet (18) is vertically fixed to the lower cylindrical part of the outer shell (12), and is connected and communicates with the outer shell (12); the inner gas inlet (17) is used for the flow of fuel gas, and the outer gas inlet (18) is used for the flow of air. The shear gas delivery chamber (16) is a cylindrical body and is fixedly installed at the center of the bottom wall of the inner shell (14); The precursor delivery chamber (15) is an annular cylinder, coaxially sleeved on the outside of the shear gas delivery chamber (16), and also fixed to the bottom wall of the inner shell (14); at the lower ends of the precursor delivery chamber (15) and the shear gas delivery chamber (16), a precursor inlet pipe and an air flow inlet pipe are respectively provided.

3. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 2, characterized in that, The atomizing nozzle (111) is used to break down and atomize the continuous phase liquid precursor into droplets and eject them as a high-speed jet by means of high-speed shearing airflow. The inner tube (112) and the outer tube (113) are both straight tube structures. The inner tube (112) and the outer tube (113) are coaxially sleeved on the outside of the atomizing nozzle (111) from the inside to the outside. One end of the inner tube (112) is vertically fixed to the wall of the outer shell (12), and the other end passes through the wall of the inner shell (14) and extends into the interior of the inner shell (14); one end of the outer tube (113) is vertically fixed to the wall of the outer shell (12), and the other end extends into the interior of the outer cavity (13); The shearing air tube (114) is a flexible tube; one end of each shearing air tube (114) is connected to the shearing air interface of the corresponding atomizing nozzle (111), and the other end is connected to the shearing air delivery chamber (16). The precursor tube (115) is a flexible tube; one end of each precursor tube (115) is connected to the precursor interface at the center of the corresponding atomizing nozzle (111), and the other end is connected to the precursor delivery chamber (15).

4. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 3, characterized in that, The inlet honeycomb body (22) is composed of honeycomb material (with a certain thickness); and the inlet honeycomb body (22) is coaxially connected by an expanding conical cylinder that gradually increases in size from bottom to top at the bottom and a cylindrical cylinder at the top. The inlet air film shell (24) is composed of a cylindrical body and annular sealing plates at the bottom and top; the inlet air film shell (24) is coaxially sleeved on the outside of the inlet honeycomb body (22), thereby forming an annular airflow chamber between the inner wall of the inlet air film shell (24) and the wall of the inlet honeycomb body (22); The atomizing combustion body (1) passes through the bottom annular sealing plate of the inlet gas film shell (24) and is fixed to the annular sealing plate; The inlet air film pipe (21) is a circular pipe structure, which is fixed perpendicularly to the wall of the inlet air film shell (24), connected and communicated, and each inlet air film pipe (21) is located in the axial middle part of the inlet air film shell (24); The inlet flow equalization cylinder (23) is a cylindrical structure, and the axial length of the inlet flow equalization cylinder (23) is greater than the outer diameter of the inlet air film pipe (21). The inlet flow equalization cylinder (23) is coaxially sleeved on the outside of the inlet honeycomb body (22) and located inside the inlet air film shell (24). The inlet flow equalization cylinder (23) is directly opposite the outlet of the inlet air film pipe (21) and is located close to the inlet air film pipe (21). The inlet flow equalization cylinder (23) is fixed to the inlet air film shell (24) by fixing ribs.

5. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 4, characterized in that, The middle honeycomb structure (32) is composed of honeycomb material; the middle honeycomb structure (32) is a cylindrical structure; The middle section air film shell (34) is composed of a cylindrical body and annular sealing plates at the bottom and top; the middle section air film shell (34) is coaxially sleeved on the outside of the middle section honeycomb body (32), thereby forming an annular airflow chamber between the inner wall of the middle section air film shell (34) and the wall of the middle section honeycomb body (32); The middle section air film tube (31) is a circular tube structure, which is fixed perpendicularly to the wall of the middle section air film shell (34), connected and communicated, and each of the middle section air film tubes (31) is located in the axial middle part of the middle section air film shell (34); The middle section flow equalization cylinder (33) is a cylindrical structure, and the axial length of the middle section flow equalization cylinder (33) is greater than the outer diameter of the middle section air film pipe (31). The middle section flow equalization cylinder (33) is coaxially sleeved on the outside of the middle section honeycomb body (32) and located inside the middle section air film shell (34). The middle section flow equalization cylinder (33) is directly opposite the outlet of the middle section air film pipe (31) and is located near the inlet air film pipe (21). The middle section flow equalization cylinder (33) is fixed to the middle section air film shell (34) by fixing ribs.

6. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 5, characterized in that, The outlet honeycomb (42) is composed of honeycomb material; and the outlet honeycomb (42) is composed of a tapered cylinder that gradually decreases in size from bottom to top; The outlet air film shell (44) is composed of a cylindrical body and annular sealing plates at the bottom and top; the outlet air film shell (44) is coaxially sleeved on the outside of the outlet honeycomb body (42), thereby forming an annular airflow chamber between the inner wall of the outlet air film shell (44) and the wall of the outlet honeycomb body (42); The outlet air film pipe (41) is a circular pipe structure, which is fixed perpendicularly to the wall of the outlet air film shell (44), connected and communicated, and each outlet air film pipe (41) is located in the axial middle part of the outlet air film shell (44). The outlet flow equalization cylinder (43) is a cylindrical structure. The axial length of the outlet flow equalization cylinder (43) is greater than the outer diameter of the outlet air film pipe (41). The outlet flow equalization cylinder (43) is coaxially sleeved on the outside of the outlet honeycomb body (42) and located inside the outlet air film shell (44). The outlet flow equalization cylinder (43) is directly opposite the outlet of the outlet air film pipe (41) and is located close to the outlet air film pipe (41). The outlet flow equalization cylinder (43) is fixed to the outlet air film shell (44) by fixing ribs.

7. The integrated high-efficiency nanopowder flame synthesis and combustion system for reducing wall adhesion according to claim 6, characterized in that, The system's working process is specifically implemented as follows: The continuous phase liquid precursor flows in through the bottom inlet of the precursor delivery chamber (15). Under the stabilizing and uniform distribution effect of the precursor delivery chamber (15), the precursor flows into each of the precursor tubes (115) and then into each of the corresponding atomizing nozzles (111). The shear gas flows in through the bottom inlet of the shear gas delivery chamber (16). Under the stabilizing and uniform distribution effect of the shear gas delivery chamber (16), the shear gas flows into each of the shear gas tubes (114) and then into each of the corresponding atomizing nozzles (111). Under the action of the centrally injected precursor and the outer shear gas, an atomized precursor jet is formed at the upper part of the outlet of the atomizing nozzle (111). The fuel gas flows in through the inner gas inlet (17), and then, inside the inner shell (14), after being stabilized and distributed by the airflow, it is ejected at high speed through the airflow channels formed between the outer wall of the atomizing nozzle (111) and the inner wall of the inner tube (112); the air flows in through the outer gas inlet (18), and then, inside the outer cavity (13), after being stabilized and distributed by the airflow, it is ejected at high speed through the airflow channels formed between the outer wall of the inner tube (112) and the inner wall of the outer tube (113); through the above combustion organization, an atomized flame is constructed from the airflow, fuel gas flow and central atomizing jet to the outside; At the same time, a portion of the airflow at the bottom flows in through the inlet air film pipe (21) and then directly impacts the inlet flow equalization cylinder (23). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the inlet flow equalization cylinder (23), the airflow flows into the pore structure of the inlet honeycomb body (22) and then flows out from the inner wall of the inlet honeycomb body (22), thereby forming a bottom gas protective film on the inner wall of the inlet honeycomb body (22). A portion of the airflow in the middle section flows in through the middle section air film tube (31) and then directly impacts the middle section flow equalization tube (33). The airflow flows in all directions, up, down, left, and right. Under the flow equalization distribution effect of the middle section flow equalization tube (33), the airflow flows into the pore structure of the middle section honeycomb body (32) and then flows out from the inner wall of the middle section honeycomb body (32), thereby forming a middle gas protective film on the inner wall of the middle section honeycomb body (32). A portion of the airflow at the top flows in through the outlet air film pipe (41) and then directly impacts the outlet flow equalizer (43). The airflow flows in all directions, up, down, left, and right. Under the flow equalization effect of the outlet flow equalizer (43), the airflow flows into the pore structure of the outlet honeycomb body (42) and then flows out from the inner wall of the outlet honeycomb body (42), thereby forming a top gas protective film on the inner wall of the outlet honeycomb body (42).

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