Discharging device for continuously preparing single-walled carbon nanotubes

Abstract

The invention discloses a discharging device for continuously preparing single-walled carbon nanotubes, which comprises a product collector, at least two layers of water mist spraying units and an airflow condensing unit, the water mist spraying units and the airflow condensing unit are arranged in the product collector, the top of the product collector is provided with an air outlet end, and the bottom of the product collector is provided with a storage chamber; wherein at least one layer of water mist spraying unit is arranged at the top gas outlet end of the product collector; the airflow condensing unit is arranged along the whole exhaust passage of the product collector, a passage I for circulating cooling liquid and a passage II for conveying waste gas are arranged in the airflow condensing unit, and the air inlet end and the air outlet end of the airflow condensing unit are respectively provided with at least one layer of water mist spraying unit. According to the discharging device for continuously preparing the single-walled carbon nanotubes, waste gas and target products can be effectively separated, the temperature of high-temperature gas exhausted from the high-temperature hearth can be reduced to 200 DEG C or below, a rear-end valve cannot be burnt out due to overtemperature, and collection of the target products is facilitated.

Description

Technical Field

[0001] This invention relates to the field of nanomaterial preparation equipment technology, and in particular to a discharge device for continuous preparation of single-walled carbon nanotubes. Background Technology

[0002] Single-walled carbon nanotubes (SWNTs) possess excellent electronic, mechanical, and electrical properties, especially their extremely high electron and hole mobility. Therefore, SWNTs are considered one of the most promising new device materials for future applications. During SWNT production, the materials conveyed from the outlet typically include high-temperature waste gas in addition to the finished product. Due to their lightweight, porous, and highly viscous nature, SWNTs easily adhere to the collector, causing blockages and disrupting continuous production. Furthermore, the high-temperature waste gas can damage the seals of downstream valves, leading to atmospheric leakage and potential hazards. This high-temperature waste gas often contains the target product, SWNTs, making their collection extremely difficult. Therefore, effectively separating the high-temperature waste gas from the target product, cooling and discharging the waste gas to ensure continuous production and easy product collection are pressing technical problems that need to be solved by those skilled in the art. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a discharge device for continuous preparation of single-walled carbon nanotubes. It can not only effectively separate waste gas from target products, but also reduce the high temperature gas discharged from the high temperature furnace to below 200 degrees Celsius, so as to prevent the downstream valve from overheating and burning out, and facilitate the collection of target products.

[0004] The technical solution provided by this invention is as follows: A continuous production device for single-walled carbon nanotubes includes a product collector, at least two layers of water mist spraying units and an airflow condensation unit disposed within the product collector. The product collector is provided with an air outlet at the top and a storage chamber at the bottom. At least one layer of water mist spraying unit is installed at the top air outlet of the product collector; The airflow condensation unit is arranged along the entire exhaust channel of the product collector. The airflow condensation unit is provided with a channel one for the flow of cooling liquid and a channel two for the transport of waste gas. The airflow condensation unit is provided with at least one layer of water mist spray unit at the air inlet and air outlet ends respectively.

[0005] Preferably, the airflow condensation unit includes a condenser tube, an upper sealing plate and a lower sealing plate disposed inside the condenser tube, and several air outlet pipes. The upper and lower sealing plates are arranged in parallel and enclose the inner wall of the condenser tube to form a cavity for holding a fluid cooling liquid. Several of the aforementioned air outlet pipes pass through the cavity in sequence, with the air inlet of the air outlet pipe located on the lower sealing plate and the air outlet of the air outlet pipe located on the upper sealing plate. The upper and lower parts of the cavity have several liquid inlets / outlets on their tube walls.

[0006] Preferably, the cooling liquid is cold water, which is transformed into hot water through heat exchange within the cavity. This hot water can be used as the raw material for the water mist spraying unit, achieving efficient utilization of heat and facilitating the better penetration and aggregation of the target product for sedimentation using hot water at a certain temperature.

[0007] Preferably, the plurality of the air outlet pipes are arranged uniformly in the cavity in a matrix.

[0008] Preferably, the plurality of the air outlet pipes are arranged in a circular matrix along the center to the edge of the cavity.

[0009] Preferably, the condenser tube at the upper part of the cavity has a liquid outlet on its outer wall, and the condenser tube at the lower part of the cavity has a liquid inlet on its outer wall.

[0010] Preferably, the diameter of the vent pipe is 5 to 30 mm, and the inner wall of the vent pipe is provided with a hydrophobic coating.

[0011] Preferably, the water mist spraying unit includes a plurality of water mist nozzles arranged circumferentially along the inner wall of the product collector, and the water mist sprayed by the water mist nozzles is preferably hot water (temperature not higher than 80°).

[0012] Preferably, the product collector includes a cylindrical body and a collection pool and a filter press mechanism disposed at the lower end of the cylindrical body. The upper part of the cylinder is provided with an exhaust valve, and the lower part of the cylinder is provided with a drain / material valve; The water level in the collection tank is always kept above the discharge port at the bottom of the cylinder by a water level switch. The filter press is connected to the collection tank to separate the target product from the water in the collection tank.

[0013] Preferably, the product collector further includes a circulation pipe, one end of which is connected to the water outlet of the filter press mechanism, and the other end is connected to the water mist spraying unit.

[0014] Preferably, the discharge device for continuous preparation of single-walled carbon nanotubes further includes a scraper, the scraper's working path is set below one of the water mist spraying units, and it is freely installed at the discharge port of the preparation equipment used for continuous preparation of single-walled carbon nanotubes.

[0015] The present invention has the following advantages over the prior art: 1. The discharge device for the continuous preparation of single-walled carbon nanotubes of the present invention can collect the mixture of product and waste gas coming out of the discharge port of the preparation equipment used for the continuous preparation of single-walled carbon nanotubes through the product collector. Since the temperature of the waste gas is high, the present invention is equipped with an airflow condensation unit to cool the waste gas, and at least two layers of water mist spraying units are set up to work in conjunction with the airflow condensation unit. Not only can some of the product rising with the waste gas be collected by settling through the water mist spraying unit located above the airflow condensation unit, but the heat exchange of the airflow condensation unit can also be used to heat the droplets falling through the second channel to form hot water that settles down. The target product (single-walled carbon nanotubes settling with hot water) is soaked in hot water and agglomerates, which further facilitates the collection of the target product. 2. The discharge device for the continuous preparation of single-walled carbon nanotubes of the present invention uses at least two layers of water mist spraying units to agglomerate the target product, which is conducive to the separation of waste gas and target product, so that the target product and waste gas are collected from different outlets, avoiding the collection loss of target product. The target product and water mixture is obtained first, and then the target product is obtained by filtration, so that the target product is collected in a way with less loss. 3. The discharge device for continuous preparation of single-walled carbon nanotubes of the present invention, through the setting of a scraper, can unblock the discharge port at any time during the production and preparation of single-walled carbon nanotubes, prevent material blockage at the discharge port, and facilitate the smooth collection of products by the product collector. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the discharge device for the continuous preparation of single-walled carbon nanotubes in an embodiment of the present invention; Figure 2 This is a schematic diagram of the airflow condensation unit in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the airflow condensation unit in an embodiment of the present invention.

[0018] Figure label: 1. Product collector; 11. Cylinder; 111. Exhaust valve; 112. Drain / material valve; 12. Water collection tank; 2. Water mist spray unit; 21. Condenser pipe; 211. Liquid outlet; 212. Liquid inlet; 22. Upper sealing plate; 23. Lower sealing plate; 24. Air outlet pipe; 25. Cavity; 3. Airflow condensation unit; 4. Scraper; 5. Discharge port. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] like Figure 1-3 As shown, this embodiment of the invention provides a discharge device for the continuous preparation of single-walled carbon nanotubes, including a product collector 1, two layers of water mist spraying units 2 disposed within the product collector 1, and an airflow condensation unit 3. The top of the product collector 1 has an outlet end, and the bottom of the product collector 1 has a storage chamber. One layer of water mist spraying unit 2 is disposed at the top outlet end of the product collector 1 and is located at the outlet end of the airflow condensation unit 3; the other layer of water mist spraying unit 2 is disposed at the inlet end of the airflow condensation unit 3. The airflow condensation unit 3 is arranged along the entire exhaust channel of the product collector 1, and has a channel one for the flow of cooling liquid and a channel two for the transport of waste gas. This embodiment illustrates two layers of water mist spraying units 2. In other embodiments, several layers of water mist spraying units 2 can be added to adjacent sides of the two layers of water mist spraying units 2 as needed.

[0021] In this embodiment, the product exiting the equipment used for the continuous preparation of single-walled carbon nanotubes includes the target product and high-temperature waste gas. The target product and high-temperature waste gas are mixed together and enter the product collector 1. Under the action of the water mist spraying unit 2 located below the airflow condensation unit, the water mist agglomerates the target product and settles into the bottom storage chamber of the product collector 1. The high-temperature waste gas rises and flows to the top of the product collector 1 through channel two in the airflow condensation unit 3. Finally, under the action of the water mist spraying unit 2 at the top, a small amount of the target product that rises with the gas settles again. When the gas passes through the airflow condensation unit 3, it is cooled by heat exchange with the cooling liquid located in channel one, ensuring that the temperature of the finally discharged gas does not exceed 200 degrees Celsius or a suitable low temperature. The target product that settles again in the upper water mist spraying unit 2 finally settles into the bottom storage chamber of the product collector 1 through channel two (airflow goes upward and water flows downward, which also avoids the target product clogging channel two).

[0022] In this embodiment, the airflow condensation unit 2 includes a condenser tube 21, an upper sealing plate 22 and a lower sealing plate 23 disposed inside the condenser tube 21, and several outlet pipes 24. The outer edge of the condenser tube 21 is adapted to the inner wall of the product collector 1 and is tightly welded to prevent waste gas from escaping from the connection between the two and cooling water from entering the collection system. The several outlet pipes 24 are a second channel for transporting waste gas. The upper sealing plate 22 and the lower sealing plate 23 are arranged in parallel and enclose the inner wall of the condenser tube 21 to form a cavity 25 for holding a fluid cooling liquid. The several outlet pipes pass through the cavity in sequence. The air inlet of the outlet pipe 24 is located on the lower sealing plate 23, and the air outlet of the outlet pipe 24 is located on the upper sealing plate 22. In addition to the space occupied by the several outlet pipes 24, the remaining space inside the cavity 25 forms a first channel for the flow of cooling liquid.

[0023] In this embodiment, the condenser tube 21, upper sealing plate 22, lower sealing plate 23, and exhaust pipe 24 are all made of stainless steel, which is resistant to high temperatures and not easily corroded. The connections of the above structures are all made by welding, resulting in good structural stability. Several exhaust pipes 24 are arranged perpendicular to the upper sealing plate 22 and lower sealing plate 23. The number of exhaust pipes 24 is arranged as many as possible while ensuring easy welding. The more exhaust pipes 24 there are, the larger the heat exchange surface area and the better the heat dissipation.

[0024] In this embodiment, the cooling liquid is cold water. The cold water is transformed into hot water through heat exchange in the cavity 25, which can be used as the raw material for the water mist spraying unit 2. This not only achieves efficient utilization of heat, but also facilitates the use of hot water with a certain temperature to better agglomerate the target product for sedimentation (if it is cold water, the target product in the storage room is likely to float on the surface of the water, increasing the difficulty of final collection).

[0025] In this embodiment, several air outlet pipes 24 are arranged in a circular matrix along the center to the edge of the cavity 25, which can maximize the use of the space inside the cavity 25.

[0026] In this embodiment, the larger the diameter of the outlet pipe 24, the worse the heat exchange effect will be. The smaller the diameter of the outlet pipe 24, the larger the specific surface area, which allows the airflow to fully contact the inner surface and the better the heat exchange effect. However, it cannot be too small, as it is not conducive to the sedimentation of the target product. Preferably, the diameter of the outlet pipe 24 is 5 to 30 mm. A hydrophobic coating is provided on the inner wall of the outlet pipe 24 to reduce the adhesion of the target product to the inner wall of the outlet pipe 24.

[0027] In this embodiment, the outer wall of the condenser tube 21 at the upper part of the cavity 25 is provided with a liquid outlet 211, and the outer wall of the condenser tube 21 at the lower part of the cavity 25 is provided with a liquid inlet 212.

[0028] In this embodiment, the water mist spraying unit 2 includes a number of water mist nozzles arranged circumferentially along the inner wall of the product collector. The water mist sprayed by the water mist nozzles is preferably hot water (temperature not higher than 80°). The number of water mist nozzles, their arrangement, and flow control parameters can be adjusted appropriately according to actual conditions.

[0029] In this embodiment, the product collector 1 includes a cylindrical body 11, a water collection tank 12 located at the lower end of the cylindrical body 11, and a filter press mechanism (not shown in the figure). An exhaust valve 111 is located at the upper part of the cylindrical body 11, and is fully open during operation. The diameter of the exhaust valve 111 determines the diameter of the exhaust pipe, and the resulting exhaust passage acts as a damping mechanism. The opening and closing degree of the exhaust valve 111 can be controlled to regulate the residence time of the exhaust gas in the product collector 1, ensuring sufficient interaction time between the exhaust gas and the water mist. A drain / feed valve 112 and a storage chamber are located at the lower part of the cylindrical body 11. After the water level reaches a certain level, the drain / material valve 112 is opened by the water level switch to control the discharge of water. The exhaust valve 111 and the drain / material valve 112 are electric, pneumatic, and automatic mechanical valves, respectively, which facilitates automatic control. The water level in the collection tank 12 is controlled by the water level switch to always keep it above the discharge port at the bottom of the cylinder 11 to prevent air from being mixed in when discharging from the storage chamber. The filter press mechanism is connected to the collection tank 12 to separate the target product from the water in the collection tank 12. The filter press mechanism can use existing high and low pressure filter press equipment.

[0030] In this embodiment, the product collector 1 also includes a circulation pipe (not shown in the figure). One end of the circulation pipe is connected to the water outlet of the filter press mechanism, and the other end is connected to the water mist spraying unit 2 to realize the recycling of water and save costs.

[0031] The discharge device for the continuous preparation of single-walled carbon nanotubes in this embodiment also includes a scraper 4. The scraper 4 is positioned below one of the water mist spraying units 2 and freely enters and exits the discharge port 5 of the equipment used for the continuous preparation of single-walled carbon nanotubes. The scraper 4 scrapes the product from the discharge port 5 into the product collector 1. The product adhering to the scraper 4 can also be removed from the scraper by the spraying action of the water mist spraying unit 2, which prevents the product from accumulating on the scraper 4 and affecting its normal use. The scraper 4 can effectively solve the problem of clogging at the discharge port 5 during the production process of single-walled carbon nanotubes.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A discharge device for continuous preparation of single-walled carbon nanotubes, characterized in that, It includes a product collector, at least two layers of water mist spraying units and an airflow condensation unit disposed within the product collector. The product collector is provided with an air outlet at the top and a storage chamber at the bottom. At least one layer of water mist spraying unit is installed at the top air outlet of the product collector; The airflow condensation unit is arranged along the entire exhaust channel of the product collector. The airflow condensation unit is provided with a channel one for the flow of cooling liquid and a channel two for the transport of waste gas. The airflow condensation unit is provided with at least one layer of water mist spray unit at the air inlet and air outlet ends respectively.

2. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 1, characterized in that, The airflow condensation unit includes a condenser tube, an upper sealing plate and a lower sealing plate disposed inside the condenser tube, and several air outlet pipes. The upper and lower sealing plates are arranged in parallel and enclose the inner wall of the condenser tube to form a cavity for holding a fluid cooling liquid. Several of the aforementioned air outlet pipes pass through the cavity in sequence, with the air inlet of the air outlet pipe located on the lower sealing plate and the air outlet of the air outlet pipe located on the upper sealing plate. The upper and lower parts of the cavity have several liquid inlets / outlets on their tube walls.

3. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 2, characterized in that, Several of the aforementioned air outlets are arranged evenly in a matrix within the cavity.

4. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 3, characterized in that, Several of the aforementioned air outlet pipes are arranged in a circular matrix along the center to the edge of the cavity.

5. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 2, characterized in that, The condenser tube at the upper part of the cavity has an outlet on its outer wall, and the condenser tube at the lower part of the cavity has an inlet on its outer wall.

6. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 2, characterized in that, The diameter of the vent pipe is 5-30 mm, and the inner wall of the vent pipe is provided with a hydrophobic coating.

7. The discharge device for continuous preparation of single-walled carbon nanotubes according to any one of claims 1-6, characterized in that, The water mist spraying unit includes a number of water mist nozzles arranged circumferentially along the inner wall of the product collector.

8. The discharge device for continuous preparation of single-walled carbon nanotubes according to any one of claims 1-6, characterized in that, The product collector includes a cylindrical body and a collection pool and a filter press mechanism located at the lower end of the cylindrical body. The upper part of the cylinder is provided with an exhaust valve, and the lower part of the cylinder is provided with a drain / material valve; The water level in the collection tank is always kept above the discharge port at the bottom of the cylinder by a water level switch. The filter press is connected to the collection tank to separate the target product from the water in the collection tank.

9. The discharge device for continuous preparation of single-walled carbon nanotubes according to claim 8, characterized in that, The product collector also includes a circulation pipe, one end of which is connected to the water outlet of the filter press mechanism, and the other end is connected to the water mist spraying unit.

10. The discharge device for continuous preparation of single-walled carbon nanotubes according to any one of claims 1-6, characterized in that, The discharge device for continuous preparation of single-walled carbon nanotubes also includes a scraper. The scraper's working path is located below one of the water mist spraying units and it is freely positioned at the discharge port of the preparation equipment used for continuous preparation of single-walled carbon nanotubes.

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