Cement wall cleaning device for furnace tube of carbon nano tube reaction furnace

Abstract

The invention belongs to the field of carbon nanotube production devices, and particularly relates to a carbon nanotube reaction furnace tube wall cleaning device which comprises an air return pipe, a housing is fixedly connected to the outer side of one end of the air return pipe, ceramic wool is fixedly connected to the outer side of the ceramic wool in a surrounding mode, and a plurality of ceramic nozzles are evenly distributed and fixedly connected to one side of the housing in the circumferential direction. The outer side of the air return pipe is annularly connected with an air supply pipe communicated with the interior of the housing in a sleeving mode, the ceramic nozzles incline outwards, an annular gap is reserved between the air return pipe and the air supply pipe, and inert gas is introduced into the air supply pipe and the housing. The cover shell, the gas return pipe and the gas supply pipe are made of heat-resistant aluminized carbon steel, inert gas flows to take away heat of the cover shell and the gas supply pipe for cooling, and ceramic wool is a high-quality thermal insulation material, so that temperature rise caused by direct contact between the cover shell and the inner wall of the reaction pipe can be effectively avoided; therefore, the problem that the cleaning work is influenced by the fact that the housing cannot smoothly move in the reaction tube due to high-temperature expansion and even softening damage is avoided.

Description

Technical Field

[0001] The invention belongs to the field of carbon nanotube production devices, in particular to a device for cleaning the wall of a furnace tube of a carbon nanotube reaction furnace. Background Art

[0002] Single-walled carbon nanotubes can be regarded as one-dimensional cylindrical nanomaterials formed by rolling up two-dimensional graphene. Due to their unique one-dimensional topological structure, excellent electrical, optical, thermal and mechanical behavior properties, single-walled carbon nanotubes are widely used in high-end batteries, sensors, heat dissipation films, molecular gears, biological detectors and nano-integrated logic circuits, becoming one of the popular materials for the development of functional nanodevices.

[0003] The chemical vapor deposition method is currently the most commonly used method for preparing single-walled carbon nanotubes. The process is simple to operate, the process is controllable, and the growth temperature is relatively low and the cost is low. The basic principle is to use a high-temperature sintering tubular furnace to pass the carbon source into its reaction chamber, where catalytic cracking occurs under the action of a specific temperature and catalyst, so that the generated carbon atoms can dissolve into the surface of the catalyst. After reaching saturation, they will precipitate from the surface and form carbon nanotubes through self-assembly.

[0004] However, after a long production process, a large amount of attachments will adhere to the inner wall of the reaction tube. The agglomerated attachments gradually accumulate on the inner wall of the reaction tube to form an accumulation that becomes thicker and thicker. In the long run, the heat transfer and mass transfer processes in the reaction tube are affected, and the reaction production efficiency is reduced. The existing technology is mostly to add a scraper ring inside, and the adhesion of the inner wall of the furnace can be slowed down by regularly moving the scraper ring.

[0005] For example, the Chinese patent with publication number CN113368789A discloses a device and method for cleaning attachments in a carbon nanotube fluidized bed reactor, which includes a distributor, an airflow acceleration nozzle arranged on the distributor, a gas compressor and a compressed gas buffer tank, wherein the air inlet of the gas compressor is connected to the gas source, the air outlet of the gas compressor is connected to the air inlet of the compressed gas buffer tank through a first pipeline and a first control valve arranged in series in the first pipeline, and the air outlet of the compressed gas buffer tank is connected to the distributor through a second pipeline and a second control valve and a pressure regulating valve arranged in series in the second pipeline in sequence. It uses air blowing and purging to clean the parts of the carbon nanotube reactor tube that are prone to attachments, so as to improve the production efficiency of the carbon nanotube production line.

[0006] However, in actual use, in addition to the floc-like attachments that are easy to clean, there are also some stubborn attachments that are difficult to clean and remove on the inner wall of the reaction tube. Although the air blowing cleaning method has a higher cleaning efficiency, it is difficult to effectively remove the stubborn attachments by simply using air blowing, which affects the final cleaning effect.

[0007] Moreover, the average operating temperature of the reactor is above 1000°C. If ordinary nozzles or other cleaning structures are directly inserted into the reaction tube for cleaning, the high temperature will cause the cleaning structure to be damaged. The traditional method of using scraper rings for cleaning will also expand after being affected by high temperatures, making it difficult for the scraper rings to move smoothly, affecting the cleaning effect.

[0008] However, if one waits for the internal temperature of the reactor to drop to a suitable temperature before cleaning, a lot of time will be wasted, and the subsequent reheating of the reactor will also waste time and electricity. The waiting time cannot be used for the production of carbon nanotubes, resulting in reduced production efficiency.

[0009] Another example is a Chinese patent with publication number CN218937065U, which discloses a device for cleaning the internal structure of a high-temperature furnace with a plug-in plate, including a cleaning chamber, a cleaning plug-in plate and a powder collecting chamber arranged at the lower part of the furnace; the cleaning plug-in plate is slidingly arranged in the cleaning chamber, and a transverse driving part is arranged on the outer wall of the furnace, and the action end of the transverse driving part is connected to the cleaning plug-in plate; the powder collecting chamber is arranged at both ends of the cleaning chamber, and the powder collecting chamber is used to collect attachments pushed to both ends by the cleaning plug-in plate. This scheme directly performs cleaning work under the high temperature state of the reactor, avoiding the problem of low production efficiency caused by forced cooling of production equipment for cleaning and maintenance, and by setting a cooling layer, the influence of the high temperature of the upper part of the furnace on the lower structural components is reduced, thereby solving the problem that the scraper ring expands due to high temperature and is difficult to scrape the inner wall of the reaction tube smoothly and stably.

[0010] However, as described in the above patent, after repeated scraping and cleaning, the scraper ring descends to the cooling layer to cool the scraper ring, and the cooling method adopts water cooling. After cooling, the temperature of the scraper ring changes dramatically. The scraper ring is easily affected by repeated and dramatic temperature changes, which greatly reduces its service life and is not conducive to long-term use. Summary of the invention

[0011] In order to overcome the deficiencies of the prior art, the present invention solves the technical problem of first using a ceramic nozzle to blow in a high-speed inert gas to perform air blowing cleaning on most of the attachments that are easy to fall off, and then using a cover to rotate with ceramic wool to perform strong brushing cleaning on the stubborn attachments on the inner wall of the reaction tube, thereby greatly improving the cleaning efficiency and cleaning effect of the inner wall of the reaction tube. By making the cover, the return air pipe and the air supply pipe adopt heat-resistant aluminized carbon steel material, and using the flow of inert gas to take away the heat of the cover and the air supply pipe, a cooling effect is achieved. In addition, the ceramic wool itself is a high-quality thermal insulation material, which can effectively avoid the temperature rise caused by direct contact between the cover and the inner wall of the reaction tube, thereby avoiding the cover from being heated by high The inert gas will not expand due to temperature or even soften and be damaged, which makes it unable to move smoothly in the reaction tube and affects the cleaning work. The temperature of the inert gas rises after absorbing heat. When it is sprayed to act on the inner wall of the reaction tube, it will not cause damage to the inner wall of the reaction tube due to drastic temperature changes. At the same time, the inert gas continuously cools the cover, which will also not cause damage to the cover due to drastic temperature changes and affect its service life. Since the cover can work normally and stably in a high-temperature environment, there is no need to wait for the temperature of the reaction tube to drop before cleaning. After cleaning, since the reaction tube still has residual temperature, the time spent on heating can be saved to improve work efficiency, and the energy consumed by heating can be saved to save production costs.

[0012] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for cleaning the wall of a carbon nanotube reactor tube, comprising:

[0013] An air return pipe, wherein a cover shell is fixedly connected to the outside of one end of the air return pipe, and ceramic wool is fixedly connected around the outside of the ceramic wool;

[0014] Ceramic nozzles, a plurality of ceramic nozzles are evenly distributed and fixedly connected to one side of the housing in a circumferential direction,

[0015] The outer ring sleeve of the air return pipe is connected to an air supply pipe which is in communication with the interior of the housing;

[0016] Each ceramic nozzle is tilted outward, and an annular gap is left between the return air pipe and the air supply pipe.

[0017] Inert gas is introduced into the air supply pipe and the cover shell.

[0018] Furthermore, the cover shell, the air return pipe and the air supply pipe are made of aluminized carbon steel.

[0019] Furthermore, a first heat dissipation grille surrounding the outer side of the return air duct is fixedly connected inside the cover shell, and a plurality of second heat dissipation grilles are evenly distributed on the inner wall of the air supply duct, and the second heat dissipation grilles are in close contact with the outer wall of the return air duct.

[0020] Furthermore, a plurality of ceramic blades are fixedly connected to one side of the casing at the center of the plurality of ceramic nozzles, the plurality of ceramic blades are assembled together to form a cross-flow impeller, and an end cap is fixedly connected to one end of each ceramic blade away from the casing.

[0021] Furthermore, a second bracket is slidably and rotatably connected to the outside of the air supply pipe, and a three-way connecting pipe covering the cover shell is fixedly connected to the side of the second bracket close to the cover shell. A sleeve is tightly sleeved inside the return air pipe, and the end of the sleeve away from the cover shell is fixedly connected to the first bracket, and the first bracket and the bottom of the second bracket are fixedly connected to a box.

[0022] Furthermore, a driven gear is slidably connected to the outer side of the air supply pipe, and a driving gear is meshingly connected to the upper side of the driven gear, and a gear cover covering the driven gear and the driving gear is fixedly connected to the side of the second bracket away from the cover shell, and a second motor is fixedly connected to the outer side of the gear cover, and a power output end of the second motor extends into the gear cover and is transmission-connected to the driving gear.

[0023] Furthermore, two first motors are symmetrically distributed and fixedly connected on both sides of the second bracket, a screw is rotatably connected between each of the first motors and the first bracket, and two first motors are fixedly connected to one side of the first bracket away from the second bracket, and a power output end of each first motor is transmission-connected to the corresponding screw, and each of the screws is transmission-connected to a screw slider, and a sliding plate seat is fixedly connected between the bottoms of the two screw sliders.

[0024] Furthermore, two slide rails are symmetrically distributed and fixedly connected on the upper side of the box body, a slide rail slider is slidably connected to each of the slide rails, and the two slide rail sliders are fixedly connected to the sliding plate seat.

[0025] Furthermore, the side of the sliding plate seat close to the cover shell is fixedly connected to an air supply ring surrounding the outside of the air supply pipe, the interior of the air supply ring is connected to the interior of the air supply pipe, and the side of the air supply ring away from the sliding plate seat is fixedly connected to a ring cover that is sleeved on the outside of the air supply pipe, the air supply ring and the ring cover are rotatably connected to the air supply pipe, and the end of the sleeve extending out of the first bracket is fixedly connected to a filter.

[0026] Furthermore, a gas cylinder for storing inert gas is fixedly connected inside the box, a pressure pump is fixedly connected to the bottle mouth of the gas cylinder, an end of the pressure pump away from the gas cylinder is connected to a refrigerator, and a hose is connected between the refrigerator and the air supply ring.

[0027] In summary, compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) First, high-speed inert gas is blown into the ceramic nozzle to clean most of the easily detached attachments. Then, the cover is used to rotate the ceramic cotton to effectively brush and clean the stubborn attachments on the inner wall of the reaction tube, thereby greatly improving the cleaning efficiency and cleaning effect of the inner wall of the reaction tube.

[0029] (2) By making the cover, return air pipe and air supply pipe made of heat-resistant aluminized carbon steel, and using the flow of inert gas to take away the heat of the cover and the air supply pipe, a cooling effect is achieved. In addition, ceramic wool itself is a high-quality thermal insulation material, which can effectively avoid the temperature rise caused by direct contact between the cover and the inner wall of the reaction tube, thereby avoiding the cover from expanding or even softening due to high temperature, resulting in its inability to move smoothly in the reaction tube and affecting the cleaning work.

[0030] (3) After absorbing heat, the temperature of the inert gas increases. When it is sprayed out and acts on the inner wall of the reaction tube, the inner wall of the reaction tube will not be damaged due to drastic temperature changes. At the same time, the inert gas continuously cools the cover, which will also not cause damage to the cover due to drastic temperature changes and affect its service life.

[0031] (4) Since the cover can work normally and stably in a high temperature environment, there is no need to wait for the temperature of the reaction tube to drop before cleaning. Since the reaction tube still has residual temperature after cleaning, the time spent on heating up can be saved to improve work efficiency, and the energy consumed by heating up can be saved to save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a three-dimensional schematic diagram of this patent.

[0033] Figure 2 This is the main view of this patent.

[0034] Figure 3 for Figure 2 Stereoscopic cross-sectional view at AA in the middle.

[0035] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0036] Figure 5 for Figure 3 A partial enlarged view of point C in the middle.

[0037] Figure 6 This is a schematic diagram of the structure of the main mechanism of this patent.

[0038] Figure 7 for Figure 6 A partial enlarged view of point D in the middle.

[0039] Figure 8 It is a partial cross-sectional view of the main mechanism in this patent.

[0040] Fig. 9 It is a schematic diagram of the structure of the cover.

[0041] Explanation of the reference numerals: cover 10; ceramic wool 11; ceramic nozzle 12; return air pipe 13; air supply pipe 14; first heat dissipation grille 15; second heat dissipation grille 16; ceramic blades 17; end cover 18; sleeve 19; air supply ring 20; ring cover 21; sliding plate seat 22; lead screw slider 23; lead screw seat 24; lead screw 25; first motor 26; slide rail slider 27; slide rail 28; first bracket 29; second bracket 30; gear cover 31; driven gear 32; driving gear 33; second motor 34; refrigerator 35; pressure pump 36; gas cylinder 37; hose 38; filter 39; three-way connecting pipe 40; box body 41. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0043] like Figure 1-9 As shown, a device for cleaning the wall of a furnace tube of a carbon nanotube reactor comprises a box body 41, wherein the first bracket 29 and the second bracket 30 are fixedly connected at both ends of the upper side of the box body 41, an air supply pipe 14 is rotatably and slidably connected inside the second bracket 30, one end of the air supply pipe 14 extending out of the second bracket 30 is fixedly connected to a cover shell 10, an air return pipe 13 coaxially arranged with the air supply pipe 14 is fixedly connected inside the cover shell 10, an annular gap communicating with the inside of the cover shell 10 is reserved between the air return pipe 13 and the air supply pipe 14, an inert gas is introduced into the annular gap, a three-way connecting pipe 40 covering the cover shell 10 is fixedly connected to the side of the second bracket 30 close to the cover shell 10, a plurality of ceramic nozzles 12 are fixedly connected to the annular surface of the cover shell 10 away from the second bracket 30 and evenly distributed in the circumferential direction, each ceramic nozzle 12 is tilted outward, and a ceramic cotton 11 is fixedly connected to the outer ring sleeve of the cover shell 10.

[0044] By arranging the ceramic nozzle 12 and the ceramic wool 11, when the cover 10 is extended into the reaction tube, high-speed inert gas is first blown in by the ceramic nozzle 12 to clean most of the attachments that are easy to fall off. Then, the cover 10 is used to rotate with the ceramic wool 11 to perform strong brushing and cleaning on the stubborn attachments on the inner wall of the reaction tube, thereby greatly improving the cleaning efficiency and cleaning effect of the inner wall of the reaction tube. In addition, air blowing is used for cleaning first, which effectively avoids a large amount of attachments from clogging and remaining in the fiber gaps of the ceramic wool 11, affecting the cleaning effect of the ceramic wool 11. In addition, the use of inert gas as the cleaning medium will not affect the reaction environment in the reaction tube.

[0045] like Figure 1-9As shown, a first heat dissipation grille 15 is fixedly connected inside the housing 10, and the first heat dissipation grille 15 is tightly fitted to the inner wall of the housing 10 and the outer wall of the return air pipe 13. A plurality of second heat dissipation grilles 16 are evenly distributed on the inner wall of the air supply pipe 14, and the second heat dissipation grilles 16 are tightly fitted to the outer wall of the return air pipe 13. Preferably, the housing 10, the return air pipe 13 and the air supply pipe 14 are made of aluminized carbon steel with suitable heat resistance and low price.

[0046] By making the cover 10, the return air pipe 13 and the air supply pipe 14 made of aluminized carbon steel with an operating temperature of 600-800°C to withstand the average temperature environment of up to 1000°C in the reaction tube, and by providing the first heat dissipation grille 15 and the second heat dissipation grille 16, when the inert gas flows in the gap between the return air pipe 13 and the air supply pipe 14, the airflow can be used to take away the heat of the cover 10 and the air supply pipe 14, thereby playing a cooling role. In addition, the ceramic wool 11 itself is a high-quality thermal insulation material, which can effectively avoid the temperature rise caused by direct contact between the cover 10 and the inner wall of the reaction tube, thereby ensuring that the cover 10, the return air pipe 13 and the air supply pipe 14 are in a suitable operating temperature range, thereby avoiding the problem that they cannot move smoothly in the reaction tube and affect the cleaning work due to high-temperature expansion or even softening damage.

[0047] Furthermore, the temperature of the inert gas increases after absorbing heat. When it is sprayed out to act on the inner wall of the reaction tube, the inner wall of the reaction tube will not be damaged due to drastic temperature changes. At the same time, the inert gas continuously cools down the cover 10, which will also not cause damage to the cover 10 due to drastic temperature changes to affect its service life. Furthermore, since the cover 10 can work normally and stably in a high-temperature environment, there is no need to wait for the temperature of the reaction tube to drop before cleaning. Since the reaction tube still has residual temperature after cleaning, the time spent on heating can be saved to improve work efficiency, and the energy consumed for heating can be saved to save production costs.

[0048] like Figure 1-9 As shown, one side of the cover 10 is located at the center of the multiple ceramic nozzles 12 and is fixedly connected to a plurality of ceramic blades 17. The multiple ceramic blades 17 are assembled together to form a cross-flow impeller. An end of each ceramic blade 17 away from the cover 10 is fixedly connected to an end cover 18. A sleeve 19 is slidably and rotatably connected in the return air pipe 13. An end of the sleeve 19 away from the cover 10 passes through a first bracket 29 and is fixedly connected to the first bracket 29. An end of the sleeve 19 extending out of the first bracket 29 is fixedly connected to a filter 39.

[0049] By arranging the ceramic blades 17 and the end cover 18, the cover 10 can rotate in the reaction tube for cleaning, driving the ceramic blades 17 to rotate and continuously suck the gas in the reaction tube into the return air pipe 13, and then the gas blowing cleaning of the ceramic nozzle 12 continuously provides gas, so that after the inert gas is sprayed out from the ceramic nozzle 12 for cleaning, a large amount of cleaned attachments are directly entered into the return air pipe 13, and enter the filter 39 through the sleeve 19, so that the attachments are filtered and retained, and the filtered inert gas can be recovered to reduce the waste of expensive inert gas.

[0050] Moreover, during this process, since low-temperature inert gas continuously flows through the air supply pipe 14 outside the return air pipe 13, the inert gas returning in the return air pipe 13 is cooled, so that the temperature of the inert gas during discharge drops to an acceptable range, thereby avoiding the problem of high-temperature inert gas being directly discharged and causing damage to the filter 39 or leakage that may scald the staff.

[0051] like Figure 1-9 As shown, a driven gear 32 is slidably connected to the outside of the air supply pipe 14, and a driving gear 33 is meshed and connected to the upper side of the driven gear 32. A gear cover 31 covering the driven gear 32 and the driving gear 33 is fixedly connected to the side of the second bracket 30 away from the cover 10, and a second motor 34 is fixedly connected to the outside of the gear cover 31. The power output end of the second motor 34 extends into the gear cover 31 and is connected to the driving gear 33. Two first motors 26 are symmetrically distributed and fixedly connected on both sides of the second bracket 30, and each first motor 26 is connected to the first bracket 2 9 is rotatably connected with a lead screw 25, and two first motors 26 are fixedly connected to the side of the first bracket 29 away from the second bracket 30, and the power output end of each first motor 26 is transmission-connected with the corresponding lead screw 25, and each lead screw 25 is transmission-connected with a lead screw slider 23, and a sliding plate seat 2 is fixedly connected between the bottoms of the two lead screw sliders 23. Two slide rails 28 are symmetrically distributed and fixedly connected on the upper side of the screw seat 2 box body 41, and a slide rail slider 27 is slidably connected to each slide rail 28, and the two slide rail sliders 27 are fixedly connected to the sliding plate seat 22.

[0052] By providing the lead screw 25, the cover 10 can be freely driven to telescope in the reaction tube, and by providing the driven gear 32 and the driving gear 33, the cover 10 can be driven to rotate stably without affecting the telescopic movement of the cover 10, thereby achieving the cleaning of the reaction tube.

[0053] like Figure 1-9As shown, the side of the sliding plate seat 22 close to the cover shell 10 is fixedly connected with an air supply ring 20 surrounding the outside of the air supply pipe 14, the interior of the air supply ring 20 is connected to the inside of the air supply pipe 14, and the side of the air supply ring 20 away from the sliding plate seat 22 is fixedly connected with a ring cover 21 ringed on the outside of the air supply pipe 14, the air supply ring 20 and the ring cover 21 are rotatably connected to the air supply pipe 14, the end of the sleeve 19 extending out of the first bracket 29 is fixedly connected to the filter 39, the inside of the box body 41 is fixedly connected with a gas cylinder 37 for storing inert gas, the bottle mouth of the gas cylinder 37 is fixedly connected with a pressure pump 36, the end of the pressure pump 36 away from the gas cylinder 37 is connected to a refrigerator 35, and a hose 38 is connected between the refrigerator 35 and the air supply ring 20.

[0054] By setting up the air supply ring 20, it is possible to always be connected with the inside of the air supply pipe 14 and stably supply inert gas to the air supply pipe 14 during the process of the air supply pipe 14 rotating and telescopic movement. The gas cylinder 37 serves as a gas source for storing inert gas. After the inert gas enters the pressure pump 36 to increase the air pressure, it is transported to the refrigerator 35 for cooling, so that it can subsequently enter the air supply ring 20 through the hose 38 and finally flow through the gap between the air supply pipe 14 and the return pipe 13 into the cover 10, thereby achieving cooling of parts such as the cover 10 and cooling of the return gas in the sleeve 19.

[0055] In this embodiment, initially, the operator connects the device to the power supply and control system, and the three-way connecting pipe 40 is connected to the end of the reaction tube of the single-walled carbon nanotube production furnace. When the production furnace is in production, the cover 10 is located in the three-way connecting pipe 40, and the produced single-walled carbon nanotubes are discharged from the lower outlet of the three-way connecting pipe 40. During the production process, the part of the reaction tube close to the three-way connecting pipe 40 belongs to the cooling zone of the production process, and the temperature of the material will not cause the cover 10 to overheat and cause damage.

[0056] After a long production process, a large amount of attachments will be attached to the inner wall of the reaction tube. The agglomerated attachments gradually accumulate on the inner wall of the reaction tube to form an accumulation body, which becomes thicker and thicker. In the long run, the heat transfer and mass transfer process in the reaction tube are affected, and the reaction production efficiency is reduced. At this time, the operator stops the production work without waiting for the reaction tube to cool down, and immediately starts the second motor 34 and the first motor 26. Due to the meshing transmission of the driving gear 33 and the driven gear 32, the power of the second motor 34 drives the cover 10, the return air pipe 13 and the air supply pipe 14 to rotate rapidly, and the first motor 26 drives the lead screw 25 to rotate, so that the lead screw slider 23 drives the sliding plate seat 22 to push the air supply pipe 14, the return air pipe 13 and the cover 10 to move horizontally into the reaction tube, and then the first motor 26 is controlled to continuously and periodically change the rotation direction, so that the cover 10 moves repeatedly in the reaction tube for cleaning.

[0057] During the process of the cover 10, the return air pipe 13 and the air supply pipe 14 extending into the reaction tube, the pressure pump 36 pressurizes the inert gas stored in the gas cylinder 37 and transports it to the refrigerator 35. After being cooled by the refrigerator 35, the inert gas enters the gap between the return air pipe 13 and the air supply pipe 14 through the hose 38 and the air supply ring 20 and flows into the cover 10, and is finally ejected from the ceramic nozzle 12 to act on the inner wall of the reaction tube, and most of the attachments that are easy to fall off are cleaned by air blowing. At the same time, the cover 10 is used to rotate with the ceramic cotton 11 to effectively brush and clean the stubborn attachments on the inner wall of the reaction tube, thereby greatly improving the cleaning efficiency and cleaning effect of the inner wall of the reaction tube. First, air blowing is used for cleaning, which effectively avoids a large amount of attachments from clogging and remaining in the fiber gaps of the ceramic cotton 11, affecting the cleaning effect of the ceramic cotton 11.

[0058] At the same time, the first heat dissipation grille 15 is utilized to increase the contact area with the inert gas, so that the inert gas can efficiently take away the heat from the cover 10, the return air pipe 13 and the air supply pipe 14. At the same time, due to the heat insulation characteristics of the ceramic wool 11, the cover 10 is effectively prevented from being in direct contact with the reaction tube and causing excessive heating, thereby effectively ensuring that the cover 10, the return air pipe 13 and the air supply pipe 14 operate within a suitable operating temperature range, avoiding the problem of expansion caused by excessive temperature, which in turn affects the movement of the cover 10 in the reaction tube and even damage to the cover 10 due to high temperature.

[0059] During the rotation of the cover 10, the ceramic blades 17 and the end cover 18 will be driven to rotate. The rotation of the ceramic blades 17 will continuously suck the surrounding gas into the return pipe 13. Due to the shielding of the end cover 18, the gas entrains the attachments swept down and flows to the filter 39 through the return pipe 13 and the sleeve 19 for filtration. After the gas is filtered, the attachments are retained by the filter 39, and the inert gas is collected again and waits for processing and recycling for reuse, thereby saving the cost of using the inert gas. In addition, when the inert gas entrains the attachments and flows in the return pipe 13, the low-temperature inert gas flowing between the return pipe 13 and the air supply pipe 14 will cool down the inert gas in the return pipe 13 after absorbing heat again, so as to avoid damage to the filter 39 when the high-temperature inert gas flows out.

[0060] During the entire cleaning process, due to its zigzag flow, the temperature of the inert gas at the end away from the cover 10 is lower and the temperature of the inert gas near the cover 10 is higher. When the inert gas is sprayed out from the ceramic nozzle 12, the temperature is already relatively high. When it directly acts on the inner wall of the reaction tube, the reaction tube will not produce too drastic temperature changes and cause damage. At the same time, the cover 10, the return air pipe 13 and the air supply pipe 14 are subjected to continuous and stable cooling, which also avoids the problem of reduced service life due to drastic temperature changes of the cover 10, the return air pipe 13 and the air supply pipe 14.

[0061] After the cleaning work is completed, the control components are reset. At this time, there is still residual temperature in the reaction tube, so that the reaction tube can quickly reach the specified working temperature when heated again, saving the preheating time of the reaction tube and reducing electricity consumption, so that the reaction tube can be put into production efficiently. Since the single-walled carbon nanotube reactor itself needs to use inert gas as protective gas during operation, the pressure pump 36 can be directly connected to the inert gas source of the single-walled carbon nanotube reactor, thereby eliminating the need to use gas cylinder 37 to store and provide inert gas.

[0062] The first motor 26, the first bracket 29, the second motor 34, the refrigerator 35, the pressure pump 36, the filter 39, etc. are mature existing technologies. The structures in the drawings are only for illustration and will not be described in detail herein.

[0063] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0064] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0065] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A device for cleaning the wall of a carbon nanotube reactor tube, characterized in that: The carbon nanotube reactor furnace tube wall cleaning device comprises: An air return pipe (13), wherein a cover shell (10) is fixedly connected to the outside of one end of the air return pipe (13), and ceramic wool (11) is fixedly connected around the outside of the ceramic wool (11); Ceramic nozzles (12), a plurality of ceramic nozzles (12) are evenly distributed and fixedly connected to one side of the housing (10) in a circumferential direction, and an outer ring sleeve of the return air pipe (13) is connected to an air supply pipe (14) that is in communication with the interior of the housing (10); Each ceramic nozzle (12) is tilted outward, an annular gap is left between the air return pipe (13) and the air supply pipe (14), and inert gas is passed through the air supply pipe (14) and the housing (10).

2. The device for cleaning the wall of a carbon nanotube reactor tube according to claim 1, characterized in that: The housing (10), the air return pipe (13) and the air supply pipe (14) are made of aluminized carbon steel.

3. The device for cleaning the wall of a carbon nanotube reactor tube according to claim 1, characterized in that: A first heat dissipation grille (15) surrounding the outside of the return air pipe (13) is fixedly connected inside the housing (10), and a plurality of second heat dissipation grilles (16) are evenly distributed on the inner wall of the air supply pipe (14), wherein the second heat dissipation grilles (16) are in close contact with the outer wall of the return air pipe (13).

4. The device for cleaning the wall of a carbon nanotube reactor tube according to claim 1, characterized in that: A plurality of ceramic blades (17) are fixedly connected to one side of the casing (10) at the center of the plurality of ceramic nozzles (12); the plurality of ceramic blades (17) are assembled together to form a cross-flow impeller; and an end cover (18) is fixedly connected to one end of each ceramic blade (17) away from the casing (10).

5. The device for cleaning the wall of a carbon nanotube reactor tube according to claim 1, characterized in that: The air supply pipe (14) is slidably and rotatably connected to the outside of a second bracket (30); the second bracket (30) is fixedly connected to a three-way connecting pipe (40) covering the cover shell (10) on one side close to the cover shell (10); a sleeve (19) is tightly sleeved inside the air return pipe (13); the sleeve (19) is fixedly connected to the first bracket (29) at one end away from the cover shell (10); and a box body (41) is fixedly connected to the bottom of the first bracket (29) and the second bracket (30).

6. The device for cleaning the carbon nanotube reactor tube wall according to claim 5, characterized in that: A driven gear (32) is slidably connected to the outside of the air supply pipe (14), and a driving gear (33) is meshed and transmission-connected on the upper side of the driven gear (32); a gear cover (31) covering the driven gear (32) and the driving gear (33) is fixedly connected to the side of the second bracket (30) away from the housing (10); a second motor (34) is fixedly connected to the outside of the gear cover (31); a power output end of the second motor (34) extends into the gear cover (31) and is transmission-connected to the driving gear (33).

7. The device for cleaning the wall of a carbon nanotube reactor tube according to claim 6, characterized in that: Two first motors (26) are symmetrically distributed and fixedly connected on both sides of the second bracket (30); a lead screw (25) is rotatably connected between each of the first motors (26) and the first bracket (29); two first motors (26) are fixedly connected on one side of the first bracket (29) away from the second bracket (30); a power output end of each first motor (26) is transmission-connected to a corresponding lead screw (25); each of the lead screws (25) is transmission-connected to a lead screw slider (23); and a sliding plate seat (22) is fixedly connected between the bottoms of the two lead screw sliders (23).

8. The device for cleaning the carbon nanotube reactor tube wall according to claim 1, characterized in that: Two slide rails (28) are symmetrically distributed and fixedly connected to the upper side of the box body (41), each of the slide rails (28) is slidably connected to a slide rail slider (27), and the two slide rail sliders (27) are fixedly connected to the sliding plate seat (22).

9. The device for cleaning the carbon nanotube reactor tube wall according to claim 7, characterized in that: The side of the sliding plate seat (22) close to the cover shell (10) is fixedly connected to an air supply ring (20) surrounding the outside of the air supply pipe (14), and the interior of the air supply ring (20) is connected to the interior of the air supply pipe (14). The side of the air supply ring (20) away from the sliding plate seat (22) is fixedly connected to a ring cover (21) sleeved on the outside of the air supply pipe (14), and the air supply ring (20) and the ring cover (21) are rotatably connected to the air supply pipe (14). One end of the sleeve (19) extending out of the first bracket (29) is fixedly connected to a filter (39).

10. The device for cleaning the carbon nanotube reactor tube wall according to claim 9, characterized in that: A gas cylinder (37) for storing inert gas is fixedly connected inside the box body (41); a pressure pump (36) is fixedly connected at the bottle mouth of the gas cylinder (37); an end of the pressure pump (36) away from the gas cylinder (37) is connected to a refrigerator (35); a hose (38) is connected between the refrigerator (35) and the air supply ring (20).

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