Carbon nanotube production equipment

Abstract

The utility model relates to the technical field of carbon nano tube production, and provides carbon nano tube production equipment which comprises a catalyst precursor vaporization device, a catalyst precursor cracking and refining device and a carbon nano tube generation device, the catalyst precursor vaporizing device vaporizes raw materials and conveys the vaporized raw materials into the catalyst precursor cracking and refining device through carrier gas to be excited and activated to generate a catalyst, and a carbon source is subjected to the action of the catalyst subjected to high-temperature cracking and excitation and activation in the carbon nanotube generating device to generate carbon nanotubes which are collected through the collecting device. According to the scheme, the catalyst precursor is cracked, excited and activated by the plasma torch through the catalyst precursor cracking and refining device to form the nanoscale catalyst, so that the catalyst and the carbon source can be fully contacted to generate the carbon nanotube, and the conditions such as the generation temperature, the reactant pressure, the flow and the mass ratio are controllable; in order to further guarantee the generation efficiency of the carbon nanotubes, hydrogen is introduced into the carbon nanotube generation device to promote the increase of the reaction rate, the production efficiency is high, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon nanotube production, in particular to carbon nanotube production equipment. Background Art

[0002] Carbon nanotubes are one-dimensional quantum materials with a special structure. Their radial dimensions are in the nanometer range, their axial dimensions are in the micrometer range, and both ends of the tubes are basically sealed. Currently, the commonly used methods for preparing carbon nanotubes are mainly arc discharge, laser ablation, chemical vapor deposition (carbon hydrogen gas pyrolysis), solid phase pyrolysis, glow discharge, gas combustion, and polymerization synthesis. However, the existing production equipment has low production efficiency and high cost due to the insufficient contact between the carbon source and the catalyst during the production process. At the same time, it causes a lot of waste of catalysts and carbon sources. In addition, due to the relatively small particle size of carbon nanotubes, the collection effect of the existing collection device and the production safety monitoring are not ideal. Therefore, it is a technical problem that needs to be solved urgently. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a carbon nanotube production device which has high carbon nanotube production efficiency, is safe to use, can perform safety monitoring, improves the mixing effect and utilization rate of raw materials and catalysts, and reduces resource waste.

[0004] The technical scheme of the utility model is: a carbon nanotube production device, comprising a catalyst precursor vaporization device, a catalyst precursor cracking and refining device and a carbon nanotube generating device, the catalyst precursor cracking and refining device is arranged between the catalyst precursor vaporization device and the carbon nanotube generating device through a pipeline, the catalyst precursor vaporization device vaporizes the raw material and transports it to the catalyst precursor cracking and refining device through a carrier gas, cracks and excites the activation to generate a catalyst under the action of plasma, the carbon source is introduced into the carbon nanotube generating device through a carbon source tube, the carbon source is subjected to high-temperature cracking in the carbon nanotube generating device and generates carbon nanotubes through the action of the catalyst after excitation and activation, and is collected by a collecting device.

[0005] The advantage of this solution is that the entire equipment is evacuated before processing and filled with argon as a protective gas and a carrier gas, so that the raw materials added in the catalyst precursor vaporization device are vaporized under heating, and the vaporized raw materials are transported to the catalyst precursor cracking and refining device by the carrier gas, and then the raw materials are excited and activated by the high-temperature plasma in the catalyst precursor cracking and refining device, ensuring that the catalyst is fully in contact with and acts on the cracked carbon source in the carbon nanotube generation device, thereby efficiently preparing carbon nanotubes, reducing the waste of catalysts and carbon sources, and improving production efficiency and productivity.

[0006] Furthermore, the catalyst precursor vaporization device is provided with a first resistance heater for vaporizing the raw material, the raw material is solid or liquid; the first resistance heater is used to heat and vaporize the raw material so that the raw material can be transported by the carrier gas. Preferably, the heating temperature of the first resistance heater is 180-300°C to ensure the heating effect and efficiency.

[0007] Furthermore, the catalyst precursor cracking and refining device is provided with a plasma generator torch for cracking and ionizing the vaporized raw materials to generate nano-scale active catalysts. The plasma generator torch used converts the vaporized catalyst into plasma at high temperature, thereby improving the effect and efficiency of the interaction between the catalyst and the subsequent carbon source.

[0008] Furthermore, the carbon nanotube generating device is provided with a second resistance heater for cracking the carbon source. The heating temperature of the second resistance heater is 800-1300° C., which ensures sufficient cracking of the carbon source and catalyst activity.

[0009] Furthermore, the carbon nanotube generation device is provided with hydrogen and argon interfaces. The addition of argon is used to protect the cracking of the carbon source and avoid air entering under high temperature to cause safety accidents. In addition, the addition of hydrogen is used to ensure the stable and continuous growth of carbon nanotubes, improve the carbon nanotube yield, methane conversion rate, and improve the morphology of carbon nanotubes.

[0010] Furthermore, the catalyst precursor cracking and refining device cracks and activates the catalyst precursor through a plasma torch to form a nano-sized catalyst, ensuring that the catalyst and the carbon source can react in sufficient contact to generate carbon nanotubes, and the generation temperature, reactant pressure, flow rate, mass ratio and other conditions are controllable.

[0011] Furthermore, the collecting device includes a capturing device and a glove box, the capturing device is connected to the glove box through a pipeline, and the glove box is connected to a vacuum pump; multiple sets of collecting devices are connected in parallel, and they take turns to clean and collect carbon nanotubes under continuous production conditions.

[0012] Furthermore, the capture device is provided with a multi-layer pluggable stainless steel metal mesh, and the metal mesh is arranged on the channel through which the gas-solid mixture flows to achieve gas-solid separation.

[0013] Furthermore, the hot exhaust gas after gas-solid separation is cooled by a bellows heat exchanger, and the cooled exhaust gas is passed through a liquid filter device to remove residual solids therein and then extracted by a vacuum pump.

[0014] Furthermore, it also includes a safety protection device and a controller that controls the entire equipment. The safety protection device includes a gas leakage detector, an audible and visual alarm, and a self-locking protection device. When the gas leakage detector detects gas leakage, it transmits a signal to the controller. The controller controls the audible and visual alarm and activates the safety self-locking protection device, thereby ensuring the safe operation of the entire equipment.

[0015] The utility model has the following characteristics:

[0016] 1. The utility model uses a catalyst precursor cracking and refining device to crack and activate the catalyst precursor through a plasma torch to form a nano-sized catalyst, ensuring that the catalyst and the carbon source can fully contact and generate carbon nanotubes at a set temperature. The generation temperature, reactant pressure, flow rate, mass ratio and other conditions are controllable, with high production efficiency and low cost. In order to further ensure the generation efficiency of carbon nanotubes, hydrogen is introduced into the carbon nanotube generation device to promote the increase of the coating rate, thereby reducing the waste of raw materials.

[0017] 2. The carbon nanotubes are captured by the multi-layer spot-check stainless steel metal mesh in the capture device, which improves the collection efficiency of the carbon nanotubes. At the same time, the waste gas is collected through purification or recycled, which reduces the pollution to the environment.

[0018] 3. The safety protection device is used to monitor the safety of the entire equipment operation process, and cooperates with the controller to avoid gas leakage. At the same time, the self-locking protection device is used to achieve self-locking to ensure production safety.

[0019] The detailed structure of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 - is a schematic diagram of the structure of the utility model;

[0021] 1-catalyst precursor vaporization device, 2-catalyst precursor cracking and refining device, 3-carbon nanotube generation device, 4-capture device, 5-vacuum pump, 6-liquid filtering device, 7-glove box, 8-raw materials, 9-argon storage tank, 10-delivery pump, 11-bellows heat exchanger. DETAILED DESCRIPTION

[0022] As shown in the attached drawings: a carbon nanotube production device, comprising a catalyst precursor vaporization device 1, a catalyst precursor cracking and refining device 2 and a carbon nanotube generating device 3, wherein the catalyst precursor cracking and refining device 2 is arranged between the catalyst precursor vaporization device 1 and the carbon nanotube generating device 3 through a pipeline, the catalyst precursor vaporization device 1 vaporizes the raw material 8 and transports it to the catalyst precursor cracking and refining device 2 through a carrier gas for cracking, excitation and activation, specifically, cracking, excitation and activation are performed under the action of a plasma torch to generate a catalyst, the carbon source is introduced into the carbon nanotube generating device 3 through a carbon source tube, the carbon source is a carbon-containing source gas such as methane or ethane, the carbon source is cracked at high temperature in the carbon nanotube generating device 3 and generates carbon nanotubes through the action of the catalyst after excitation and activation and is collected by a collecting device; the device It also includes a safety protection device and a controller for controlling the entire device. The safety protection device includes a gas leak detector, an audible and visual alarm, and a self-locking protection device. When the gas leak detector detects leaking gas, it transmits a signal to the controller. The controller controls the audible and visual alarm and activates the safety self-locking protection device, thereby ensuring the safe operation of the entire device. Preferably, the catalyst precursor cracking and refining device activates the catalyst precursor through a plasma torch cracking to form a nano-sized catalyst, ensuring that the catalyst and the carbon source can fully contact and react to generate carbon nanotubes, and the generation temperature, reactant pressure, flow rate, mass ratio and other conditions are controllable. The sensors of the gas leak detector can be installed at the valves and the connections of each pipeline to ensure the accuracy of gas leak detection and avoid missed detection.

[0023] In the embodiment, a raw material 8 storage tank is provided on the catalyst precursor vaporization device, and the raw material storage tank is connected to the catalyst precursor vaporization device through a delivery pump 10. The catalyst precursor vaporization device 1 is also connected to an argon storage tank 9 through a pipeline. Argon is used as a carrier gas and a protective gas to ensure the normal delivery and production safety of the raw material 8. A first resistance heater for vaporizing the raw material 8 is provided in the catalyst precursor vaporization device 1. The raw material 8 is solid or liquid. In this embodiment, the raw material 8 is ferrocene dissolved in liquid gasoline. The first resistance heater is used to heat and vaporize the raw material 8 to ensure that the raw material 8 is transported with the carrier gas. Preferably, the heating temperature of the first resistance heater is 200°C to ensure the heating effect and efficiency. The matching temperature can be selected according to the use of the raw material 8.

[0024] In the embodiment, a plasma generator torch is provided in the catalyst precursor cracking and refining device 2, and the plasma generator torch is used to crack and ionize the vaporized catalyst precursor raw material to generate a nano-scale active catalyst. The plasma generator torch used converts the vaporized catalyst precursor into a highly active iron catalyst through high-temperature plasma, thereby improving the reaction effect and efficiency between the catalyst and the subsequent carbon source.

[0025] In the embodiment, a second resistance heater for cracking the carbon source is provided in the carbon nanotube generating device 3. The heating temperature of the second resistance heater is 1200°C to ensure the full cracking of the carbon source. Preferably, the carbon nanotube generating device 3 is provided with hydrogen and argon interfaces, and the hydrogen interface and the argon interface are connected to the argon storage tank 9 and the hydrogen storage tank through pipelines, and the hydrogen storage tank can also be used to store the hydrogen in the tail gas after cracking to realize the recycling of hydrogen; the addition of the argon is used to protect the cracking of the carbon source and avoid air entering under high temperature conditions to cause safety accidents; in addition, the addition of the hydrogen is to ensure the stable and continuous growth of carbon nanotubes, improve the yield of carbon nanotubes, the methane conversion rate, and improve the morphology of carbon nanotubes; preferably, in this embodiment, the carbon source tube and hydrogen and argon can share the same main pipe, and the gas can be fully mixed before the mixed gas enters the carbon nanotube generating device, and pressure gauges and solenoid valves can also be set on each branch pipe.

[0026] In an embodiment, the collecting device includes a capturing device 4 and a glove box 7, wherein the capturing device 4 is connected to the glove box 7 through a pipeline, and the glove box 7 is connected to a vacuum pump 5. Preferably, a multi-layer plug-in stainless steel metal mesh is provided in the capturing device 4, and the metal mesh is arranged on the channel through which the gas-solid mixture flows to realize gas-solid separation, thereby realizing the collection of carbon nanotubes. More preferably, the hot exhaust gas after gas-solid separation is cooled by a bellows heat exchanger 11, and the cooled exhaust gas is passed into a liquid filter device 6 to remove the residual solid matter therein and then extracted by a vacuum pump 5, and the liquid filter device 6 absorbs the particles in the exhaust gas to prevent the solid particles from damaging the vacuum pump 5; preferably, the collecting device can be connected in parallel in multiple sets, and take turns to clean and collect carbon nanotubes under continuous production.

[0027] During use, the entire equipment is evacuated before processing and filled with argon as a protective gas and a carrier gas, so that the raw material 8 added in the catalyst precursor vaporization device 1 is vaporized under heating and transported to the catalyst precursor cracking and refinement device 2 by the carrier gas, and then the vaporized raw material 8 is activated by high-temperature excitation through the catalyst precursor cracking and refinement device 2, to ensure that the catalyst generated by the raw material 8 is in full contact and reaction with the carbon source cracked in the carbon nanotube generation device 3, thereby efficiently preparing carbon nanotubes, reducing the waste of catalysts and carbon sources, and improving production efficiency and productivity.

[0028] Before using the equipment, first check the electrical, gas, water, cooling water, pipeline patency, gas source pressure, etc., and all switch valves are linked; after the inspection is completed, close all valves, and turn on the vacuum pump 5 to vacuum each device. After the vacuum is completed, introduce protective gas to maintain a slightly negative pressure state to complete the gas replacement and be in a slightly negative pressure state. After confirmation, the protective gas and cooling water continue to work, turn on all heating devices and plasma torches, and automatically operate and monitor in real time. After the production conditions are met, start production, and start conveying raw materials 8 into the catalyst precursor vaporization device 1. The raw materials 8 are excited and activated by the catalyst precursor cracking and refining device 2, and then enter the carbon nanotube generation device 3 to fully react with the cracked carbon source to generate carbon nanotubes. The carbon nanotubes are collected after the product is separated by gas and solid, and the waste gas is discharged after cooling and treatment.

[0029] The utility model uses a catalyst precursor cracking and refining device 2 to excite and activate the catalyst precursor raw material through a plasma torch to form nano-sized catalyst iron particles, ensuring that the catalyst and the carbon source can fully contact and act at a set temperature to generate carbon nanotubes, with high production efficiency and low cost. In order to further ensure the generation efficiency of carbon nanotubes, hydrogen is introduced into the carbon nanotube generation device 3 to promote the increase of the coating rate, thereby reducing the waste of raw materials 8. The carbon nanotubes are captured by the multi-layer spot-check stainless steel metal mesh in the capture device 4, thereby improving the generation efficiency of the carbon nanotubes. At the same time, the waste gas is purified, collected or recycled, thereby reducing the pollution to the environment. The safety protection device is used to monitor the safety of the entire equipment during operation, and cooperates with the controller to avoid gas leakage. At the same time, the self-locking protection device is used to achieve self-locking to ensure production safety.

[0030] The above are preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention are within the protection scope of the present invention.

Claims

1. A carbon nanotube production device, comprising a catalyst precursor vaporization device, a catalyst precursor cracking and refining device and a carbon nanotube generating device, wherein the catalyst precursor cracking and refining device is arranged between the catalyst precursor vaporization device and the carbon nanotube generating device through a pipeline, characterized in that: The catalyst precursor vaporization device transports the vaporized raw materials to the catalyst precursor cracking and refining device through the carrier gas, the carbon source is introduced into the carbon nanotube generating device through the carbon source tube, and the carbon nanotubes generated in the carbon nanotube generating device are collected by the collecting device.

2. The carbon nanotube production equipment according to claim 1, characterized in that: The catalyst precursor vaporization device is provided with a first resistance heater for vaporizing a raw material, and the raw material is in a solid or liquid state.

3. The carbon nanotube production equipment according to claim 1, characterized in that: The catalyst precursor cracking and refining device is provided with a plasma generator torch for cracking and ionizing the vaporized raw materials to generate nano-scale active catalysts.

4. The carbon nanotube production equipment according to claim 1, characterized in that: The carbon nanotube generating device is provided with a second resistance heater for cracking the carbon source.

5. The carbon nanotube production equipment according to claim 4, characterized in that: The carbon nanotube generating device is provided with hydrogen and argon interfaces.

6. The carbon nanotube production equipment according to claim 1, characterized in that: The catalyst precursor cracking and refining device cracks, excites and activates the catalyst precursor through a plasma torch.

7. The carbon nanotube production equipment according to any one of claims 1 to 5, characterized in that: The collecting device comprises a capturing device and a glove box. The capturing device is connected to the glove box through a pipeline, and the glove box is connected to a vacuum pump. Multiple sets of the collecting devices are connected in parallel.

8. The carbon nanotube production equipment according to claim 7, characterized in that: The capture device is provided with a multi-layer plug-in stainless steel metal mesh, which is arranged on the channel through which the gas-solid mixture flows to achieve gas-solid separation.

9. The carbon nanotube production equipment according to claim 8, characterized in that: The hot exhaust gas after gas-solid separation is cooled by a bellows heat exchanger. The cooled exhaust gas passes through a liquid filter to remove residual solids and is then pumped out by a vacuum pump.

10. The carbon nanotube production equipment according to claim 1, characterized in that: It also includes a safety protection device and a controller that controls the entire equipment. The safety protection device includes a gas leakage detector, an audible and visual alarm, and a self-locking protection device. When the gas leakage detector detects gas leakage, it transmits a signal to the controller. The controller controls the audible and visual alarm and activates the safety self-locking protection device.

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