Carbon nanotube drum-type continuous water collection device

Abstract

The present application relates to nanometer material preparation and collection equipment technical field, especially a kind of for carbon nanotube drum type continuous water collection device, including bearing unit, which is installed with the drum of horizontal fixed frame, the drive unit being arranged in the left side of drum and receiving unit;Rotatable filter cartridge is coaxially arranged in the inside of drum, and the left and right ends of filter cartridge are coaxially fixed with rotating connecting portion respectively, to make filter cartridge rotate and support in drum by rotating connecting portion, the outer surface of filter cartridge has filter small hole, and the inside of filter cartridge has spiral distribution guide plate;Water injection unit for continuously injecting clean water into drum;Gas inlet pipe group unit for inputting tail gas;Tail gas recovery unit for discharging and processing after washing tail gas.The present application realizes efficient, continuous, dust-free carbon nanotube wet collection, solves the problems of efficiency attenuation, shutdown cleaning and dust leakage of traditional collection mode.

Description

Technical Field

[0001] This invention relates to the field of nanomaterial preparation and collection equipment technology, and in particular to a continuous water collection device for carbon nanotubes using a drum type. Background Technology

[0002] Chemical vapor deposition (CVD) is a key technology for the large-scale preparation of carbon nanotubes. After the reaction, the high-temperature process exhaust gas carries a large amount of carbon nanotube powder, which needs to be effectively collected. Currently, bag filtration and static water bath methods are mainly used in industry.

[0003] While bag filtration boasts high initial collection efficiency, carbon nanotubes readily clog the pores of the filter media, causing a rapid increase in system resistance. This necessitates frequent shutdowns for backflushing or filter bag replacement, severely impacting production continuity. Furthermore, the unavoidable release of nanoparticles during filter bag loading and unloading poses a significant occupational health risk.

[0004] The static water bath method directly introduces exhaust gas into a water tank and uses water to capture carbon nanotubes. Although this avoids dust, it has inherent drawbacks: carbon nanotubes are hydrophobic and tend to accumulate on the water surface to form a dense floating layer, which seriously hinders subsequent gas-solid contact and causes the collection efficiency to drop sharply over time; at the same time, the viscous slurry formed by collection is difficult to discharge continuously and smoothly from the static tank, resulting in low automation.

[0005] Therefore, developing a carbon nanotube collection device that can achieve continuous and stable operation, efficient collection, automatic discharge, and is absolutely environmentally friendly is a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned defects and provide a continuous water collection device for carbon nanotube drums.

[0007] To overcome the deficiencies in the prior art, the technical solution adopted by the present invention to solve its technical problem is: a continuous water collection device for carbon nanotube drum type, comprising a bearing unit on which a horizontally fixed drum, a driving unit and a receiving unit are mounted; a rotatable filter cylinder is coaxially arranged inside the drum, and a rotating connecting part is coaxially fixed to the left and right ends of the filter cylinder, so that the filter cylinder is rotatably supported in the drum through the rotating connecting part; the outer surface of the filter cylinder is densely covered with filter holes, and a spirally distributed guide plate is arranged along the axial direction on the inner wall of the filter cylinder;

[0008] The water injection unit has an inlet end connected to an external water supply unit and an outlet end connected to the lower part of the drum, which is used to continuously inject clean water into the drum.

[0009] The air intake pipe unit has its air intake end connected to the pneumatic conveying unit and its air outlet end connected to the inner cavity of the drum.

[0010] The rotating connection part at the left end of the filter cartridge is coaxially connected to the drive unit; the rotating connection part at the right end of the filter cartridge is connected to the receiving unit, and the center of the rotating connection part at the right end of the filter cartridge has a through cavity.

[0011] The upper part of the drum is equipped with an exhaust gas recovery unit, which is used to discharge and treat the exhaust gas after washing.

[0012] In a further improvement, the exhaust gas recovery unit includes a wire mesh demister installed at a preset opening on the upper part of the drum and an exhaust gas emission pipe assembly. The air inlet of the wire mesh demister is connected to the preset opening on the drum, and the air outlet is sealed to the exhaust gas emission pipe assembly.

[0013] In a further improvement, the air intake pipe unit is connected to the receiving unit to recover part of the exhaust gas from the inner cavity of the drum and discharged through the receiving unit after washing.

[0014] In a further improvement, the water injection unit includes multiple water injection nozzles and a water injection pipe assembly. The water injection nozzles are connected to the lower part of the drum housing and the spray nozzles face the inner cavity of the drum. The water inlet of each water injection nozzle is connected in parallel with the water injection pipe assembly. The water inlet of the water injection pipe assembly is connected to an external water supply unit, and a regulating valve is connected in series on the water injection pipe assembly.

[0015] As a further improvement, a liquid level detection unit is provided on the roller.

[0016] In a further improvement, the roller is set at an angle of 0 to 5 degrees relative to the horizontal plane on the bearing unit.

[0017] The beneficial effects of this invention are: this design realizes efficient, continuous, and dust-free wet collection of carbon nanotubes, solving the problems of efficiency decay, downtime for cleaning, and dust leakage in traditional collection methods. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle DD;

[0021] In the diagram, 1-bearing unit, 2-material receiving unit, 3-exhaust gas recovery unit, 4-air inlet pipe assembly unit, 5-drum, 6-drive unit, 7-water injection unit, and 8-liquid level detection unit;

[0022] 301 - Exhaust gas emission pipe assembly; 302 - Wire mesh demister;

[0023] 501-Filter cartridge, 502-Baffle plate, 503-Rotary connecting part;

[0024] 701-Water injection nozzle, 702-Water injection pipe assembly, 703-Regulating valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] refer to Figure 1 and Figure 2 A continuous water collection device for carbon nanotubes using a drum type includes a support unit 1 on which a horizontally fixed drum 5, a drive unit 6 located on the left side of the drum 5, and a receiving unit 2 are mounted. A rotatable filter cartridge 501 is coaxially arranged inside the drum 5. Rotary connecting parts 503 are coaxially fixed to the left and right ends of the filter cartridge 501, allowing the filter cartridge 501 to be rotatably supported within the drum 5 via the rotary connecting parts 503 and to rotate around the central axis of the drum 5. The outer surface of the filter cartridge 501 is densely covered with filter holes, and spirally distributed guide plates 502 are arranged along the axial direction on the inner wall of the filter cartridge 501. When the filter cartridge 501 rotates, the guide plates 502 rotate accordingly, stirring the water entering the filter cartridge 501 and capturing carbon nanotube powder in the exhaust gas, forming a slurry which is then axially pushed forward, preventing slurry deposition.

[0027] Water injection unit 7 has its inlet end connected to an external water supply unit and its outlet end connected to the lower part of the drum 5. It is used to continuously inject clean water into the drum 5. The injected clean water seeps into the filter cartridge 501 through the small holes on the surface of the filter cartridge 501 to dilute and wash the carbon nanotube slurry, thereby realizing a continuous water collection process.

[0028] The air inlet pipe unit 4 has an air inlet end connected to the pneumatic conveying unit and an air outlet end connected to the inner cavity of the drum 5. It is used to introduce the process exhaust gas carrying carbon nanotubes output from the pneumatic conveying unit into the inside of the drum 5.

[0029] The rotating connection part 503 at the left end of the filter cartridge 501 is coaxially connected to the drive unit 6 to receive the driving force; the rotating connection part 503 at the right end of the filter cartridge 501 is connected to the receiving unit 2, and the center of the rotating connection part 503 at the right end of the filter cartridge 501 has a through cavity, which serves as a discharge channel, so that the carbon nanotube slurry formed inside the filter cartridge 501 after washing is continuously output to the receiving unit 2;

[0030] The upper part of the drum 5 is provided with an exhaust gas recovery unit 3, which is used to discharge and treat the exhaust gas after washing.

[0031] In a specific embodiment, the exhaust gas recovery unit 3 includes a wire mesh demister 302 installed at a preset opening on the upper part of the drum 5 and an exhaust gas emission pipe assembly 301. The air inlet of the wire mesh demister 302 is connected to the preset opening on the drum 5, and the air outlet is sealed to the exhaust gas emission pipe assembly 301. The wire mesh demister 302 is used to capture tiny droplets and residual carbon nanotube particles entrained in the exhaust gas, preventing them from causing material loss or environmental pollution when discharged with the exhaust gas. The exhaust gas after demisting is led to a subsequent treatment system such as a scrubbing tower or incineration device or directly discharged into the atmosphere through the exhaust gas emission pipe assembly 301. This setup can significantly reduce the liquid and solid content entrained in the exhaust gas and meet environmental emission requirements.

[0032] In a specific embodiment, the air inlet pipe unit 4 is connected to the receiving unit 2 to recover part of the washed exhaust gas from the inner cavity of the drum 5 and discharged through the receiving unit 2. Part of the exhaust gas forms a gas circulation loop between the drum 5, the receiving unit 2, and the air inlet pipe unit 4. The process exhaust gas output by the pneumatic conveying unit carries unsettled carbon nanotube dust. This gas is tangentially input into the air inlet pipe unit 4. The exhaust gas enters the inner cavity of the drum 5 and forms a swirling or turbulent flow, which on the one hand promotes full contact between carbon nanotubes and washing water, and on the other hand prevents carbon nanotubes from prematurely depositing on the surface of the filter cartridge 501. At the same time, the clean exhaust gas generated after water washing and filtration in the drum 5 has removed most of the carbon nanotubes and is discharged through the receiving unit 2 and returned to the air inlet pipe unit 4 for recirculation and washing, thereby improving the efficiency of carbon nanotube water collection.

[0033] In a specific embodiment, the drive unit 6 drives the filter cartridge 501 to rotate at a speed of 30 to 60 revolutions per minute. Within this speed range, the rotation of the filter cartridge 501 generates waves and foam, capturing airborne carbon nanotube powder. Furthermore, the spiral guide plate 502 on the inner wall of the filter cartridge 501 can generate sufficient axial thrust to continuously push the formed carbon nanotube slurry to the right-end outlet. This avoids excessive centrifugal dehydration of the slurry due to excessively high rotation speed, which could clog the filter pores, and also avoids material accumulation or insufficient washing due to excessively low rotation speed.

[0034] In a specific embodiment, the water injection unit 7 includes multiple water injection nozzles 701 and a water injection pipe assembly 702. The water injection nozzles 701 are connected to the lower part of the drum 5's housing, with their nozzles facing the inner cavity of the drum 5. The inlet of each water injection nozzle 701 is connected in parallel to the water injection pipe assembly 702. The inlet of the water injection pipe assembly 702 is connected to an external water supply unit, and a regulating valve 703 is connected in series on the water injection pipe assembly 702 to regulate the overall flow rate within the water injection pipe assembly 702. The regulating valve 703 can be a ball valve, needle valve, or electric regulating valve. During operation, clean water enters the water injection pipe assembly 702, is distributed by the regulating valve 703, and then distributed to each water injection nozzle 701 to uniformly and continuously inject clean water into the drum 5. By adjusting the opening of the regulating valve 703, the water injection rate can be controlled in real time according to the concentration, viscosity, and washing requirements of the carbon nanotube slurry, achieving precise control of the water collection process and avoiding water waste or insufficient washing.

[0035] In a specific embodiment, a liquid level detection unit 8 is provided on the drum 5 to detect the liquid level height of the slurry inside the drum 5 in real time. Specifically, the liquid level detection unit 8 adopts a non-contact ultrasonic liquid level gauge or a capacitive liquid level gauge, and its detection probe is installed on the top or side of the drum 5, without direct contact with the inner cavity of the drum 5. The non-contact detection method can avoid contamination, corrosion or blockage of the detection element by the carbon nanotube slurry, ensuring the stability and measurement accuracy of long-term operation. The output signal of the liquid level detection unit 8 can be connected to a control unit such as a PLC. When the liquid level is detected to exceed the set upper limit or fall below the set lower limit, the control unit automatically adjusts the water injection rate of the regulating valve 703 or the rotation speed of the drive unit 6 to maintain the liquid level inside the drum 5 within a reasonable range, ensuring the stable operation of the continuous water collection process.

[0036] In a specific embodiment, the roller 5 is inclined at an angle of 0 to 5 degrees relative to the horizontal plane on the bearing unit 1. Specifically, the left end of the feed end of the roller 5 is higher than the right end of the discharge end, so that the slurry tends to flow from left to right under the assistance of gravity. This small inclination angle design can reduce the axial thrust required by the spiral guide plate 502 inside the filter cartridge 501 and reduce the energy consumption of the drive unit 6; on the other hand, it can control the residence time of the slurry in the roller and avoid insufficient washing caused by the material passing through the roller too quickly due to an excessively large inclination angle. The inclination angle range of 0 to 5 degrees is suitable for low-density, easily suspended solid-liquid mixtures such as carbon nanotubes, and can achieve stable and continuous discharge while ensuring the washing effect.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A continuous water collection device for carbon nanotube drums, characterized in that, The system includes a support unit (1), on which a horizontally fixed roller (5), a drive unit (6) located on the left side of the roller (5), and a receiving unit (2) are mounted. A rotatable filter cylinder (501) is coaxially arranged inside the roller (5). Rotary connecting parts (503) are coaxially fixed to the left and right ends of the filter cylinder (501) so that the filter cylinder (501) is rotatably supported inside the roller (5) through the rotary connecting parts (503). The outer surface of the filter cylinder (501) is densely covered with filter holes. A spirally distributed guide plate (502) is arranged on the inner wall of the filter cylinder (501) along the axial direction. The water injection unit (7) has its inlet end connected to the external water supply unit and its outlet end connected to the lower part of the drum (5) for continuously injecting clean water into the drum (5); The air intake pipe unit (4) has its air intake end connected to the pneumatic conveying unit and its air outlet end connected to the inner cavity of the roller (5); The rotating connection part (503) at the left end of the filter cartridge (501) is coaxially connected to the drive unit (6); the rotating connection part (503) at the right end of the filter cartridge (501) is connected to the receiving unit (2), and the center of the rotating connection part (503) at the right end of the filter cartridge (501) has a through cavity. The upper part of the drum (5) is provided with a tail gas recovery unit (3) for discharging and treating the tail gas after washing.

2. The continuous water collection device for carbon nanotube drums as described in claim 1, characterized in that: The exhaust gas recovery unit (3) includes a wire mesh demister (302) installed at a preset opening on the upper part of the drum (5) and an exhaust gas discharge pipe assembly (301). The air inlet of the wire mesh demister (302) is connected to the preset opening on the drum (5), and the air outlet is sealed to the exhaust gas discharge pipe assembly (301).

3. The continuous water collection device for carbon nanotube drums as described in claim 1, characterized in that: The air intake pipe unit (4) is connected to the receiving unit (2) to recover part of the washed exhaust gas from the inner cavity of the drum (5) and discharged through the receiving unit (2).

4. The continuous water collection device for carbon nanotube drums as described in claim 1, characterized in that: The water injection unit (7) includes multiple water injection nozzles (701) and water injection pipe assembly (702). The water injection nozzles (701) are connected to the lower part of the housing of the roller (5) and the spray nozzles face the inner cavity of the roller (5). The water inlet of each water injection nozzle (701) is connected in parallel with the water injection pipe assembly (702). The water inlet of the water injection pipe assembly (702) is connected to an external water supply unit, and a regulating valve (703) is connected in series on the water injection pipe assembly (702).

5. A continuous water collection device for carbon nanotube drums as described in claim 1, characterized in that: The roller (5) is equipped with a liquid level detection unit (8).

6. A continuous water collection device for carbon nanotube drums as described in claim 1, characterized in that: The roller (5) is set at an angle of 0 to 5 degrees relative to the horizontal plane on the bearing unit (1).

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