A production device for oligo-walled carbon nanotubes

Abstract

The present invention relates to the technical field of production of oligo-walled carbon nanotubes, specifically to a production device of oligo-walled carbon nanotubes, comprising a fluidized bed reactor, a mixed flow distributor and a gas heating furnace, wherein the mixed flow distributor is arranged at the bottom end of the fluidized bed reactor, and is used to evenly distribute the reaction gas into the fluidized bed reactor, wherein the mixed flow distributor comprises a fixed guide seat, a guide cabin, an adjusting guide vane assembly and a main worm gear rotatably mounted on the inner side of the guide cabin, a flow divider is arranged at the top of the guide cabin, an introduction pipe is arranged at the bottom end of the fixed guide seat, and a guide bucket connected to the end of the introduction pipe in a one-to-one correspondence is arranged on the inner side of the fixed guide seat. In the present invention, through the cooperation of a plurality of flow dividers and adjusting guide vane assemblies, the optimized distribution and flow rate control of the reaction gas can be realized in the fluidized bed reactor, and the flow divider can effectively improve the uniformity of the gas flow rate and the controllability of the flow direction through a plurality of concentrically arranged guide tube structures, and can more evenly distribute the reaction gas, thereby improving the generation efficiency of the oligo-walled carbon nanotubes.

Description

Technical Field

[0001] The invention relates to the technical field of production of oligo-walled carbon nanotubes, in particular to a production device for oligo-walled carbon nanotubes. Background Art

[0002] As an emerging nanomaterial, carbon nanotubes have excellent mechanical, electrical and thermal conductivity properties, and show broad application prospects in the fields of electronics, energy and materials science. However, the structural complexity of carbon nanotubes and the high requirements for process conditions during production have brought many challenges to existing production technologies, especially in the production of oligo-walled carbon nanotubes. Traditional production equipment has a series of technical defects and deficiencies, which makes it difficult to meet the production needs of high-quality oligo-walled carbon nanotubes.

[0003] In a fluidized bed reactor, the uniformity of gas flow rate and flow direction has a crucial influence on the growth of carbon nanotubes. Most of the existing gas distributors use fixed guide plates or simple nozzles, which cannot dynamically adjust the gas flow, resulting in uneven distribution of the reaction gas in the fluidized bed, which in turn causes inconsistent thickness of the carbon nanotube wall layer. Especially in the production of "small-walled" carbon nanotubes, this unevenness will lead to a significant decrease in product purity and consistency. Secondly, the mixing of carbon source gases usually relies on natural diffusion of gases or is achieved by simple mechanical stirring. This mixing method is inefficient and easily forms a situation where the local gas concentration is too high or too low, resulting in an increased tendency to generate multi-walled carbon nanotubes and a reduction in the yield of small-walled carbon nanotubes. In addition, insufficient mixing of the reaction gases will also lead to low product purity, which is difficult to meet the needs of high-end applications. The generation of small-walled carbon nanotubes usually needs to be carried out at high temperatures, and traditional devices are difficult to operate stably under high temperature environments due to the limitations of material heat resistance and structural design. Frequent temperature fluctuations and material corrosion of the equipment not only shorten the service life of the device, but also lead to fluctuations in reaction conditions during the production process, further affecting the quality consistency of carbon nanotubes.

[0004] In view of this, research and improvement are conducted on the existing problems, and a production device for oligo-walled carbon nanotubes is provided to solve the existing problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted by the present invention is: a production device for oligo-walled carbon nanotubes, comprising: a fluidized bed reactor, a mixed flow distributor and a gas heating furnace, wherein the mixed flow distributor is arranged at the bottom end of the fluidized bed reactor, and is used to evenly distribute the reaction gas into the fluidized bed reactor, wherein the mixed flow distributor comprises a fixed guide seat, a guide cabin, an adjusting guide vane assembly and a main worm gear rotatably mounted on the inner side of the guide cabin, wherein the bottom end of the fixed guide seat is provided with an introduction pipe, and the inner side of the fixed guide seat is provided with a guide bucket which is connected to the end of the introduction pipe in a one-to-one correspondence, wherein the guide cabin is fixed to the top end of the fixed guide seat, wherein the adjusting guide vane assembly is arranged on the inner side of the guide cabin, wherein the top end of the guide cabin is provided with a flow divider for dispersing the reaction gas, wherein the top end of the guide bucket is provided with a fixed ring blade fixed to the inner side of the adjusting guide vane assembly, wherein the top end of the fixed ring blade is fixedly connected with a fixed guide ring, wherein the number of the main worm gears is several and they are rotatably mounted on the inner side of the guide cabin in sequence, wherein the bottom end of the main worm gear is fixedly connected with a driving motor, and wherein the driving motor is fixed at the axis of the gas heating furnace;

[0007] The regulating guide vane assembly includes a bearing cylinder, a flange ring, regulating guide vanes, a crank connecting rod and a synchronizer ring. The bearing cylinder and the flange ring are concentrically arranged on the inner side of the guide cabin. The regulating guide vanes are in a plurality and are evenly distributed on the outer periphery of the bearing cylinder along the circumferential direction. The regulating guide vanes are radially arranged and penetrate the surface of the flange ring. One end of the flange ring is fixedly connected to the end of the crank connecting rod, and the other end of the crank connecting rod is movably connected to the surface of the synchronizer ring.

[0008] In a preferred example, the present invention can be further configured as follows: the diverter is a plurality of concentrically arranged guide tubes, and a flange-shaped guide plate structure is provided at the top of the guide tube, and the gas flow is guided through the plurality of diverters to optimize the flow rate and uniformity of the gas.

[0009] In a preferred example, the present invention can be further configured as follows: the inner blade arrangement direction of the fixed ring blade is opposite to the rotation direction of the blades on the surface of the main worm wheel, the guide buckets are evenly distributed on the inner side of the fixed guide seat in a circumferential direction, the bottom ends of the guide buckets are connected to the top ends of each inlet pipe in a one-to-one correspondence, and the top ends of the guide buckets face the surface of the fixed ring blade. Under the guidance of the guide buckets, the reaction gas generates a rotational motion trend under the guidance of the surface of the fixed ring blade, and the motion direction is rapidly changed under the action of the main worm wheel, thereby generating mixed flow in the gas, performing airflow mixing, and mixing multiple reaction gases.

[0010] In a preferred example, the present invention can be further configured as follows: the inlet pipe is used to filter the reaction gas and introduce the reaction gas into the inner side of the fixed guide seat, the reaction gas is a mixed gas of carbon source gas and hydrogen, the carbon source gas includes one or more of methane, acetylene or ethylene, hydrogen is used to adjust the reaction atmosphere, and various carbon source gases are guided by different inlet pipes, and various reaction gases are introduced separately through several inlet pipes, or several inlet pipes are used to distribute a single reaction gas in an ambience to improve the gas flow mixing effect.

[0011] In a preferred example, the present invention can be further configured as follows: an axle pin is provided at one end of the regulating guide vane and is fixedly connected to the top end of the crank connecting rod through a flange ring passing through the axle pin; the other end of the crank connecting rod deviates from the center of the axle pin and is movably connected to the surface of a synchronizer ring; the synchronizer ring is rotatably sleeved on the outer periphery of the guide cabin; and a plurality of regulating guide vanes are linked to perform deflection motion by rotating the synchronizer ring on the outer periphery of the guide cabin to adjust the airflow guidance, and the airflow mixing effect is adjusted according to the type and quantity of the carbon source gas.

[0012] In a preferred example, the present invention can be further configured as follows: a liquid cooling jacket is provided on the surface of the drive motor and is connected to a liquid cooling duct; the regulating guide vane assembly and the main worm gear are made of high temperature resistant and corrosion resistant materials, including ceramics, stainless steel or high temperature alloys, to ensure long-term stable operation of the device in a high temperature reaction environment.

[0013] In a preferred example, the present invention can be further configured as follows: a gas-solid separator is provided at the top of the fluidized bed reactor to separate the generated oligo-walled carbon nanotubes from the reaction exhaust gas; the gas-solid separator is a cyclone separator or a multi-stage filter structure to collect the oligo-walled carbon nanotube particles and reduce their loss in the exhaust gas.

[0014] In a preferred example, the present invention can be further configured as follows: a temperature control system for controlling a gas heating furnace is provided on the inner side of the fluidized bed reactor to maintain the temperature inside the fluidized bed reactor between 600-900°C to ensure the stable growth of oligo-walled carbon nanotubes.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. In the present invention, through the cooperation of multiple diverters and regulating guide vane assemblies, it is possible to achieve optimized distribution and flow rate control of the reaction gas in the fluidized bed reactor. The diverter effectively improves the uniformity of the gas flow rate and the controllability of the flow direction through a number of concentrically arranged guide tube structures, and can more evenly distribute the reaction gas, thereby improving the generation efficiency of oligo-walled carbon nanotubes.

[0017] 2. In the present invention, the dynamic coordination between the guide vane assembly and the main worm gear is utilized to perform multiple rotation adjustments and mixing on the gas flow direction before the reaction gas enters the fluidized bed reactor. The main worm gear further changes the gas rotation direction to enhance the mixing effect of the gas flow, effectively improving the mixing degree of different carbon source gases and ensuring that the reaction gas can be more fully mixed inside the reactor.

[0018] 3. In the present invention, by adjusting the interaction between the guide vane assembly and the main worm gear, efficient gas mixing is achieved in the reactor, so that different carbon source gases can enter the reaction area evenly, avoiding the situation where the local gas concentration is too high or too low. This precise gas mixing can effectively reduce the formation tendency of multi-walled carbon nanotubes, improve the purity and output ratio of few-walled carbon nanotubes, and help produce high-quality single-walled or few-walled carbon nanotubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the installation structure of a mixed flow distributor and a gas heating furnace according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the cross-sectional structure of a mixed flow distributor according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a mixed flow distributor and a gas heating furnace according to an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the internal structure of a fixed guide seat according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the exploded structure of an adjusting guide vane assembly according to an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of an adjusting guide vane assembly according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 100. Fluidized bed reactor;

[0028] 200, mixed flow distributor; 210, fixed guide seat; 220, guide cabin; 230, regulating guide vane assembly; 240, main worm gear; 211, inlet pipe; 212, guide bucket; 213, fixed ring vane; 214, fixed guide ring; 221, flow divider; 231, bearing cylinder; 232, flange ring; 233, regulating guide vane; 234, crank connecting rod; 235, synchronizer ring;

[0029] 300. Gas heating furnace; 310. Driving motor; 311. Liquid cooling pipe. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0031] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0032] A production device for oligo-walled carbon nanotubes provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0033] Combination Figure 1-Figure 7 As shown, the present invention provides a production device for oligo-walled carbon nanotubes, comprising: a fluidized bed reactor 100, a mixed flow distributor 200 and a gas heating furnace 300, wherein the mixed flow distributor 200 is arranged at the bottom end of the fluidized bed reactor 100, and is used to evenly distribute the reaction gas into the fluidized bed reactor 100, the mixed flow distributor 200 comprises a fixed guide seat 210, a guide cabin 220, an adjusting guide vane assembly 230 and a main worm gear 240 rotatably mounted on the inner side of the guide cabin 220, the bottom end of the fixed guide seat 210 is provided with an inlet pipe 211, and the inner side of the fixed guide seat 210 is provided with a one-to-one corresponding connection with the end of the inlet pipe 211. The guide bucket 212 is provided with a guide chamber 220 fixed to the top of the fixed guide seat 210, the regulating guide vane assembly 230 is arranged on the inner side of the guide chamber 220, the top of the guide chamber 220 is provided with a diverter 221 for dispersing the reaction gas, the top of the guide bucket 212 is provided with a fixed ring blade 213 fixed to the inner side of the regulating guide vane assembly 230, the top of the fixed ring blade 213 is fixedly connected with a fixed guide ring 214, the number of main worm gears 240 is several and they are rotatably installed on the inner side of the guide chamber 220 in sequence, and the bottom end of the main worm gear 240 is fixedly connected with a driving motor 310, and the driving motor 310 is fixed at the axis of the gas heating furnace 300;

[0034] The regulating guide vane assembly 230 includes a bearing cylinder 231, a flange ring 232, an regulating guide vane 233, a crank connecting rod 234 and a synchronizer ring 235. The bearing cylinder 231 and the flange ring 232 are concentrically arranged on the inner side of the guide cabin 220. The number of the regulating guide vanes 233 is several and is evenly distributed on the outer periphery of the bearing cylinder 231 along the circumferential direction. The regulating guide vanes 233 are radially arranged and penetrate the surface of the flange ring 232. One end of the flange ring 232 is fixedly connected to the end of the crank connecting rod 234, and the other end of the crank connecting rod 234 is movably connected to the surface of the synchronizer ring 235.

[0035] In this embodiment, the flow divider 221 is a plurality of concentrically arranged flow guide cylinders, and a flange-shaped flow guide plate structure is provided at the top of the flow guide cylinders.

[0036] Specifically, the gas flow is guided by a plurality of flow dividers 221 to optimize the flow rate and uniformity of the gas.

[0037] In this embodiment, the inner blade arrangement direction of the fixed ring blade 213 is opposite to the rotation direction of the blades on the surface of the main worm gear 240, and the guide buckets 212 are evenly distributed in the circumferential direction on the inner side of the fixed guide seat 210. The bottom ends of the guide buckets 212 are connected one by one with the top ends of each inlet pipe 211, and the top ends of the guide buckets 212 face the surface of the fixed ring blade 213.

[0038] Specifically, under the guidance of the guide bucket 212, the reaction gas generates a rotational motion tendency under the guidance of the surface of the fixed ring blade 213, and the motion direction is rapidly changed under the action of the main worm gear 240, thereby generating mixed flow in the gas, performing airflow mixing, and mixing multiple reaction gases.

[0039] In this embodiment, the inlet pipe 211 is used to filter the reaction gas and introduce the reaction gas into the inner side of the fixed guide seat 210. The reaction gas is a mixture of carbon source gas and hydrogen. The carbon source gas includes one or more of methane, acetylene or ethylene. Hydrogen is used to adjust the reaction atmosphere, and various carbon source gases are guided using different inlet pipes 211.

[0040] Specifically, various reaction gases are introduced separately through a plurality of introduction pipes 211, or a single reaction gas is distributed around the globe using a plurality of introduction pipes 211, thereby improving the gas flow mixing effect.

[0041] In this embodiment, an axial pin is provided at one end of the regulating guide vane 233 and is fixedly connected to the top end of the crank connecting rod 234 through the axial pin passing through the flange ring 232. The other end of the crank connecting rod 234 deviates from the center of the axial pin and is movably connected to the surface of the synchronous ring 235. The synchronous ring 235 is rotatably sleeved on the outer periphery of the guide cabin 220.

[0042] Specifically, the airflow direction can be adjusted by rotating the synchronous ring 235 on the periphery of the guide cabin 220 to link a plurality of adjustment guide vanes 233 to perform deflection movement, thereby adjusting the airflow direction and adjusting the airflow mixing effect according to the type and quantity of the carbon source gas.

[0043] In this embodiment, a liquid cooling jacket is provided on the surface of the driving motor 310 and is connected to a liquid cooling duct 311. The regulating guide vane assembly 230 and the main worm gear 240 are made of high temperature resistant and corrosion resistant materials, such as ceramics, stainless steel or high temperature alloys, to ensure long-term stable operation of the device in a high temperature reaction environment.

[0044] In this embodiment, a gas-solid separator is provided at the top of the fluidized bed reactor 100 for separating the generated oligo-walled carbon nanotubes from the reaction exhaust gas. The gas-solid separator is a cyclone separator or a multi-stage filter structure for collecting the oligo-walled carbon nanotube particles and reducing their loss in the exhaust gas.

[0045] Specifically, the cyclone separator works based on the principle of centrifugal force. When the mixture of reaction gas and oligo-walled carbon nanotube particles enters the cyclone separator, the mixed gas will generate high-speed rotation inside the separator, and the heavier oligo-walled carbon nanotube particles will be thrown to the wall of the separator under the action of centrifugal force, and settle down along the wall, and finally fall into the collection device. At the same time, the lighter reaction waste gas is discharged from the top of the cyclone separator to achieve gas-solid separation. The structure is simple in design, occupies a small area, and has high separation efficiency, which is suitable for the recovery of oligo-walled carbon nanotubes in large-scale production processes.

[0046] In another embodiment, the gas-solid separator can be a multi-stage filter structure. The multi-stage filter is usually composed of several filter elements or filter screen levels, and the pore size of each filter element or filter screen gradually decreases from the front stage to the back stage. When the mixture of reaction gas and oligo-walled carbon nanotube particles passes through the multi-stage filter, the larger nanotube particles will be first intercepted by the front stage filter, while the smaller particles will be intercepted by the subsequent stage filters in turn. Finally, the clean reaction exhaust gas is discharged from the last stage filter, and the oligo-walled carbon nanotube particles are captured in filter elements of different levels. The design of the multi-stage filter structure makes the separation process more refined, which is particularly suitable for the production needs of high-purity oligo-walled carbon nanotubes.

[0047] Whether it is a cyclone separator or a multi-stage filter structure, the gas-solid separator can be seamlessly connected with the fluidized bed reactor, and the gas-solid separation operation in the continuous production process can be realized through reasonable pipeline connection. In addition, in order to further improve the separation efficiency, a dust collection device or a condensation device can be installed at the outlet of the gas-solid separator to recover the tiny oligo-walled carbon nanotube particles that may be present in the exhaust gas, thereby minimizing material loss and improving product yield.

[0048] Through the above implementation, the present invention provides an efficient gas-solid separation scheme for oligo-walled carbon nanotubes, which not only ensures the purity and yield of the product, but also effectively reduces the loss of carbon nanotubes in the exhaust gas, and has good industrial application prospects.

[0049] In this embodiment, a temperature control system for controlling the gas heating furnace 300 is provided inside the fluidized bed reactor 100 to maintain the temperature inside the fluidized bed reactor between 600-900° C. to ensure the stable growth of the oligo-walled carbon nanotubes.

[0050] Specifically, the temperature control system includes a temperature sensor, a temperature controller and a gas heating furnace 300. The temperature sensor is arranged on the inner side of the fluidized bed reactor 100 to monitor the temperature inside the reactor in real time. The temperature sensor can adopt a high-precision thermocouple or an infrared temperature sensor to ensure that the temperature inside the reactor can be accurately measured under high temperature conditions. The temperature controller connects the temperature sensor and the gas heating furnace 300, and adjusts the heating power of the gas heating furnace in real time by receiving the temperature signal from the temperature sensor to maintain the temperature inside the reactor within a set range. The temperature controller can adopt a PID proportional-integral-differential control algorithm to ensure the stability and response speed of the temperature regulation, so that the temperature fluctuation inside the fluidized bed reactor is minimized.

[0051] The gas heating furnace 300 is the core component of the temperature control system, providing heat by burning gas or electric heating. The heat output of the gas heating furnace is controlled by the temperature controller to achieve precise temperature regulation. In order to improve the uniformity of temperature, the gas heating furnace can ensure uniform heat distribution in the reactor through devices such as a circulating fan or a heat exchanger to avoid local overheating or overcooling.

[0052] In actual operation, after the fluidized bed reactor 100 is started, the gas heating furnace 300 starts working, and the temperature control system gradually raises the temperature inside the reactor to between 600-900°C. This temperature range is the optimal temperature range for the growth of oligo-walled carbon nanotubes, which can promote the decomposition of the carbon source gas on the catalyst surface and the nucleation and growth of carbon nanotubes. At the same time, the temperature control system will continuously monitor and adjust the heating power to ensure that the temperature inside the reactor remains stable throughout the production process, preventing the destruction of the nanotube structure due to excessively high temperature or the decrease in growth efficiency due to excessively low temperature.

[0053] Through the above design, the temperature control system provided by the present invention can efficiently maintain the temperature in the fluidized bed reactor between 600-900°C, providing an ideal environment for the stable growth of oligo-walled carbon nanotubes. This temperature control method not only improves the production quality and yield of oligo-walled carbon nanotubes, but also enhances the controllability and repeatability of the production process, and has significant industrial application value.

[0054] The working principle and use process of the present invention:

[0055] Before starting the fluidized bed reactor 100, the gas heating furnace 300 preheats the reactor interior to a set temperature range of 600-900°C. This temperature range is considered to be the optimal temperature range for the growth of oligo-walled carbon nanotubes. The temperature control system monitors the temperature inside the reactor in real time through a temperature sensor, and adjusts the power of the gas heating furnace through a temperature controller to ensure that the temperature inside the reactor is always maintained within the set range.

[0056] The carbon source gas such as acetylene, methane and the like and the carrier gas such as hydrogen, argon and the like are mixed in a predetermined ratio and introduced into the mixed flow distributor 200 through the gas supply system. The mixed flow distributor 200 is arranged at the bottom of the fluidized bed reactor 100 and is responsible for evenly distributing the reaction gas into the reactor. Its main structure includes a fixed guide seat 210, a guide cabin 220, an adjusting guide vane assembly 230 and a main worm gear 240 rotatably installed in the guide cabin. The reaction gas first enters the guide bucket 212 through the introduction pipe 211 of the fixed guide seat 210. Under the interaction of the fixed ring blade 213 and the main worm gear 240, the gas generates a rotational motion in the guide cabin to form a mixed flow effect. Subsequently, after further dispersion by the diverter 221, the gas evenly enters the fluidized bed reactor 100, ensuring sufficient contact between the gas and the catalyst particles and promoting the improvement of the reaction efficiency. During operation, the regulating guide vane assembly 230 adjusts the airflow direction by rotating the synchronization ring 235 to link the regulating guide vane 233 to meet the mixing requirements of different types and quantities of carbon source gases. This flexible airflow adjustment mechanism makes the reaction conditions more controllable, thereby improving the production quality of oligo-walled carbon nanotubes. The gas heating furnace 300, under the control of the temperature control system, raises the internal temperature of the reactor to between 600-900°C.

[0057] The temperature control system is composed of a temperature sensor, a temperature controller and a gas heating furnace 300. By real-time monitoring and adjusting the heating power, the temperature inside the reactor is ensured to be kept within a stable range, providing an ideal temperature environment for the growth of oligo-walled carbon nanotubes. After the temperature reaches the set value, the reaction gas evenly distributed by the mixed flow distributor 200 enters the fluidized bed reactor 100, so that the catalyst particles are in a fluidized state. The carbon source gas decomposes under high temperature conditions, and carbon atoms gradually deposit on the surface of the catalyst particles to form oligo-walled carbon nanotubes. By optimizing the gas flow rate and reaction conditions, the efficient growth and structural stability of the carbon nanotubes are ensured. The oligo-walled carbon nanotubes generated by the reaction are mixed with the reaction exhaust gas and enter the gas-solid separator located at the top of the fluidized bed reactor 100 through the guidance of the air flow. The gas-solid separator can be a cyclone separator or a multi-stage filter, which is used to separate the oligo-walled carbon nanotube particles from the exhaust gas. The cyclone separator uses centrifugal force to throw the heavier oligo-walled carbon nanotube particles to the wall of the vessel, and the particles settle along the wall into the collection device, while the light exhaust gas is discharged from the top. The multi-stage filter captures oligo-walled carbon nanotube particles of different particle sizes by filtering step by step to ensure high separation efficiency. After the gas-solid separation is completed, the oligo-walled carbon nanotube particles are collected in a special container. In order to improve the recovery efficiency, the exhaust gas can be further condensed or dust-collected to recover the tiny carbon nanotube particles and reduce material loss.

[0058] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A production device for oligo-walled carbon nanotubes, characterized in that: include: A fluidized bed reactor (100), a mixed flow distributor (200) and a gas heating furnace (300), wherein the gas heating furnace (300) provides heat by burning gas or electric heating, and the mixed flow distributor (200) is arranged at the bottom end of the fluidized bed reactor (100) and is used to evenly distribute the reaction gas into the fluidized bed reactor (100). The mixed flow distributor (200) comprises a fixed guide seat (210), a guide cabin (220), an adjustable guide vane assembly (230), and a main worm gear (240) rotatably mounted on the inner side of the guide cabin (220); an inlet pipe (211) is provided at the bottom end of the fixed guide seat (210); a guide bucket (212) is provided on the inner side of the fixed guide seat (210) and is in one-to-one correspondence with the end of the inlet pipe (211); the guide cabin (220) is fixed to the top end of the fixed guide seat (210); and the adjustable guide vane assembly (230) is arranged on the inner side of the guide cabin (220). The top of the guide chamber (220) is provided with a flow divider (221) for dispersing the reaction gas, the top of the guide bucket (212) is provided with a fixed ring blade (213) fixed to the inside of the regulating guide vane assembly (230), the top of the fixed ring blade (213) is fixedly connected to a fixed guide ring (214), the main worm gear (240) is plural in number and is rotatably mounted on the inside of the guide chamber (220) in sequence, the bottom of the main worm gear (240) is fixedly connected to a drive motor (310), and the drive motor (310) is fixed to the axis of the gas heating furnace (300); The regulating guide vane assembly (230) comprises a bearing cylinder (231), a flange ring (232), a regulating guide vane (233), a crank connecting rod (234) and a synchronizing ring (235); the bearing cylinder (231) and the flange ring (232) are arranged concentrically on the inner side of the guide chamber (220); the regulating guide vanes (233) are in a plurality and are evenly distributed on the outer periphery of the bearing cylinder (231) along the circumferential direction; the regulating guide vanes (233) are arranged radially and penetrate the surface of the flange ring (232); one end of the flange ring (232) is fixedly connected to the end of the crank connecting rod (234); the other end of the crank connecting rod (234) is movably connected to the surface of the synchronizing ring (235); One end of the regulating guide vane (233) is provided with an axle pin and is fixedly connected to the top end of a crank connecting rod (234) through the axle pin passing through a flange ring (232); the other end of the crank connecting rod (234) deviates from the center of the axle pin and is movably connected to the surface of a synchronizing ring (235); and the synchronizing ring (235) is rotatably sleeved on the outer periphery of the guide cabin (220).

2. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: The flow divider (221) is a plurality of concentrically arranged flow guide cylinders, and a flange-shaped flow guide plate structure is provided at the top of the flow guide cylinders.

3. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: The inner blade arrangement direction of the fixed ring blade (213) is opposite to the rotation direction of the blades on the surface of the main worm wheel (240); the guide buckets (212) are evenly distributed on the inner side of the fixed guide seat (210) in a circumferential direction; the bottom ends of the guide buckets (212) are connected to the top ends of the respective inlet pipes (211) in a one-to-one correspondence; and the top ends of the guide buckets (212) face the surface of the fixed ring blade (213).

4. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: The introduction tube (211) is used to filter the reaction gas and introduce the reaction gas into the inner side of the fixed guide seat (210); the reaction gas is a mixed gas of a carbon source gas and hydrogen; the carbon source gas includes one or more of methane, acetylene or ethylene; hydrogen is used to adjust the reaction atmosphere; and different carbon source gases are guided using different introduction tubes (211).

5. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: The surface of the drive motor (310) is provided with a liquid cooling jacket and is connected to a liquid cooling duct (311); the regulating guide vane assembly (230) and the main worm gear (240) are made of high temperature resistant and corrosion resistant materials, including ceramics, stainless steel or high temperature alloys, to ensure long-term stable operation of the device in a high temperature reaction environment.

6. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: A gas-solid separator is provided at the top of the fluidized bed reactor (100) for separating the generated oligo-walled carbon nanotubes from the reaction waste gas; the gas-solid separator is a cyclone separator or a multi-stage filter structure for collecting oligo-walled carbon nanotube particles and reducing their loss in the waste gas.

7. The production device of oligo-walled carbon nanotubes according to claim 1, characterized in that: A temperature control system for controlling the gas heating furnace (300) is provided inside the fluidized bed reactor (100), and is used to maintain the temperature inside the fluidized bed reactor between 600-900°C, so as to ensure the stable growth of the oligo-walled carbon nanotubes.

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