CN216321805U - Fixed bed device for continuously producing carbon nano tubes - Google Patents
Fixed bed device for continuously producing carbon nano tubes Download PDFInfo
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- CN216321805U CN216321805U CN202122942023.2U CN202122942023U CN216321805U CN 216321805 U CN216321805 U CN 216321805U CN 202122942023 U CN202122942023 U CN 202122942023U CN 216321805 U CN216321805 U CN 216321805U
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- producing carbon
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Abstract
The utility model provides a fixed bed device for continuously producing carbon nano tubes, which comprises a reaction chamber, wherein the main body of the reaction chamber is cylindrical and hollow, a feeding device and a feeding control motor are arranged at the upper end of the reaction chamber, the feeding control motor controls the feeding device to convey a catalyst into the reaction chamber, heating pipes arranged in an array manner and a heat insulation layer covering the outer parts of the heating pipes are arranged on the inner wall of the reaction chamber, a conical porous plate is arranged in the reaction chamber, a discharging pipe communicated with the reaction chamber is arranged on the side surface of the reaction chamber, a spiral drill bit is arranged in the discharging pipe and is positioned on the upper surface of the porous plate in the reaction chamber, and an air inlet is arranged at the lower end of the reaction chamber. The problem that the continuous production of equipment is influenced by catalyst replacement in the prior art is solved.
Description
Technical Field
The utility model relates to the technical field of carbon nanotube preparation, in particular to a fixed bed device for continuously producing carbon nanotubes.
Background
The carbon nano tube is a one-dimensional nano material formed by coiling a single-layer or multi-layer flaky graphite tube, and has outstanding performances in three aspects of mechanics, electricity and chemistry. The excellent performance of the carbon nano tube enables the carbon nano tube to be widely applied to the fields of engineering, electronics, chemical engineering, biology and the like. Therefore, the preparation method of the carbon nanotube has been extensively and intensively studied since the discovery.
There are many methods for preparing carbon nanotubes, but the main methods capable of mass production are an arc method, a laser evaporation method, and a chemical vapor deposition method. The chemical vapor deposition method is widely used. The method utilizes gaseous substances to carry out substance transfer and chemical reaction on solids so as to generate solid deposits. Alkane, alkene, alkyne, carbon monoxide and the like are generally selected as carbon source gas, and the carbon nanotube is prepared by catalytic decomposition in an oxygen-free state under the action of a supported transition metal catalyst (Fe, Co, Ni and the like) at a certain temperature (800-.
At present, methane catalytic cracking experiments in laboratories are carried out in fixed bed reactors, the fixed bed reactors need to stop reaction whenever catalysts are about to be inactivated, the catalysts are added again to ensure high conversion rate, and the fixed bed reactors cannot carry out continuous production. The fluidized bed reactor in industrial production can not ensure the same high conversion rate as the fixed bed, which causes excessive waste of the catalyst.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fixed bed device for continuously producing carbon nano tubes, which aims to solve the problem that the continuous production of equipment is influenced by catalyst replacement in the prior art.
In order to solve the technical problem, the utility model provides a fixed bed device for continuously producing carbon nanotubes, which comprises a reaction chamber, wherein a main body of the reaction chamber is cylindrical and hollow, a feeding device and a feeding control motor are arranged at the upper end of the reaction chamber, the feeding control motor controls the feeding device to convey a catalyst into the reaction chamber, heating pipes which are arranged in an array mode and a heat insulation layer covering the outer portions of the heating pipes are arranged on the inner wall of the reaction chamber, a conical porous plate is arranged in the reaction chamber, a discharging pipe communicated with the reaction chamber is arranged on the side surface of the reaction chamber, a spiral drill bit is arranged in the discharging pipe, the spiral drill bit is positioned on the upper surface of the porous plate in the reaction chamber, and an air inlet is arranged at the lower end of the reaction chamber.
The axis of the conical porous plate is collinear with the axis of the cylindrical reaction chamber, and the porous plate is positioned at the middle lower part inside the reaction chamber.
The spiral drill bit is parallel to one generatrix of the conical porous plate.
Arrange and install row material motor on the material pipe, arrange the rotatory row of material motor control spiral line drill bit.
The discharge pipe is provided with a discharge opening.
The gas inlet comprises a nitrogen gas inlet, a hydrogen gas inlet and a carbon source gas inlet.
The utility model has the following beneficial effects: the fixed bed device for continuously producing the carbon nano tubes has good reaction effect, does not need to stop reaction when replacing the catalyst, has high conversion rate, and can continuously produce while ensuring the same high conversion rate as a fixed bed reactor.
Drawings
FIG. 1 is a schematic structural view of a fixed bed apparatus for continuously producing carbon nanotubes according to an embodiment of the present invention;
wherein, the device comprises a feeding device 1, a feeding control motor 2, a heating pipe 3, a heat insulation layer 4, a reaction chamber 5, a porous plate 6, a spiral drill 7, an air inlet 8, a discharge port 9, a discharge pipe 10 and a discharge motor 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
As shown in fig. 1, the embodiment of the present invention provides a fixed bed device for continuously producing carbon nanotubes, which includes a reaction chamber 5, wherein a main body of the reaction chamber 5 is cylindrical and hollow, a feeding device 1 and a feeding control motor 2 are installed at an upper end of the reaction chamber 5, the feeding control motor 2 controls the feeding device 1 to convey a catalyst into the reaction chamber 5, heating pipes 3 arranged in an array manner and an insulating layer 4 covering the outside of the heating pipes 3 are installed on an inner wall of the reaction chamber 5, a tapered porous plate 6 is installed in the reaction chamber 5, a discharging pipe 10 communicated with the reaction chamber 5 is installed on a side surface of the reaction chamber 5, a spiral drill 7 is installed in the discharging pipe 10, the spiral drill 7 is located on an upper surface of the porous plate 6 in the reaction chamber 5, and an air inlet 8 is installed at a lower end of the reaction chamber 5.
Further, the axis of the conical perforated plate 6 is collinear with the axis of the cylindrical reaction chamber 5, and the perforated plate 6 is located at a lower middle portion inside the reaction chamber 5.
Further, the helical drill 7 is parallel to one of the generatrices of the conical perforated plate 6.
Further, a discharging motor 11 is installed on the discharging pipe 10, and the discharging motor 11 controls the spiral drill bit 7 to rotate for discharging.
Further, a discharge opening 9 is formed in the discharge pipe 10.
Further, the gas inlet 8 comprises a nitrogen gas inlet, a hydrogen gas inlet and a carbon source inlet.
The upper surface of the porous plate 6 is pre-filled with a layer of carbon nano-tubes, and the temperature distribution is uniform due to the good heat-conducting property of carbon. The reaction chamber 5 is filled with reaction gas from the bottom to the top through the gas inlet 8, and the porous plate 6 enables the reaction gas to uniformly pass through to react with the catalyst.
Methane is used as carbon source gas, and Cu-Ni/SiO is used2As a catalyst, firstly introducing nitrogen into the reaction chamber 5 at a flow rate of 400ml/min, then introducing hydrogen at a flow rate of 200ml/min to reduce a catalyst precursor, and introducing methane at a flow rate of 400ml/min to perform methane cracking reaction at a temperature of 600 ℃. The initial conversion rate of methane is 71%, the conversion rate begins to decrease after 16h of reaction begins, the conversion rate is less than 10% after 48h of reaction, and the reaction is ended.
After the reaction time of the catalyst in the reaction chamber 5 reaches the limit, the catalyst is discharged through the spiral drill 7, and then the feeding device 1 feeds new catalyst into the reaction chamber 5 to continue the reaction.
In conclusion, the fixed bed device for continuously producing the carbon nano tubes has good reaction effect, does not need to stop reaction when replacing the catalyst, has high conversion rate, and can continuously produce while ensuring the same high conversion rate as a fixed bed reactor.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. A fixed bed device for continuously producing carbon nano tubes is characterized in that: comprises a reaction chamber (5), the main body of the reaction chamber (5) is cylindrical and hollow inside, the upper end of the reaction chamber (5) is provided with a feeding device (1) and a feeding control motor (2), the feeding control motor (2) controls the feeding device (1) to convey the catalyst to the reaction chamber (5), the inner wall of the reaction chamber (5) is provided with heating pipes (3) which are arranged in an array and an insulating layer (4) which covers the outside of the heating pipes (3), a conical porous plate (6) is arranged in the reaction chamber (5), a discharge pipe (10) communicated with the reaction chamber (5) is arranged on the side surface of the reaction chamber, arrange and install spiral line drill bit (7) in material pipe (10), spiral line drill bit (7) are located the upper surface of perforated plate (6) in reaction chamber (5), reaction chamber (5) lower extreme is provided with air inlet (8).
2. The fixed-bed apparatus for continuously producing carbon nanotubes according to claim 1, wherein the axis of the conical porous plate (6) is collinear with the axis of the cylindrical reaction chamber (5), and the porous plate (6) is located at a lower middle portion inside the reaction chamber (5).
3. The fixed bed apparatus for continuously producing carbon nanotubes as claimed in claim 1, wherein the helical drill (7) is parallel to one of the generatrices of the tapered porous plate (6).
4. The fixed bed apparatus for continuously producing carbon nanotubes as claimed in claim 1, wherein a discharging motor (11) is installed on said discharging tube (10), and said discharging motor (11) controls the helical drill (7) to rotate for discharging.
5. The fixed bed apparatus for continuously producing carbon nanotubes as claimed in claim 4, wherein said discharge pipe (10) is provided with a discharge port (9).
6. The fixed bed apparatus for continuously producing carbon nanotubes according to claim 1, wherein the gas inlet (8) comprises a nitrogen gas inlet, a hydrogen gas inlet, and a carbon source inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122942023.2U CN216321805U (en) | 2021-11-26 | 2021-11-26 | Fixed bed device for continuously producing carbon nano tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122942023.2U CN216321805U (en) | 2021-11-26 | 2021-11-26 | Fixed bed device for continuously producing carbon nano tubes |
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| Publication Number | Publication Date |
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| CN216321805U true CN216321805U (en) | 2022-04-19 |
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| CN202122942023.2U Active CN216321805U (en) | 2021-11-26 | 2021-11-26 | Fixed bed device for continuously producing carbon nano tubes |
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2021
- 2021-11-26 CN CN202122942023.2U patent/CN216321805U/en active Active
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