A drum stirring type low-temperature plasma activated carbon particle regenerating device

Abstract

The application discloses a drum stirring type low-temperature plasma activated carbon particle regeneration device, which comprises a stirring tank, an input unit, a stirring unit and a low-temperature plasma degradation unit.The axis of the stirring tank is horizontally arranged, and an input port and an output port are arranged at two ends of the stirring tank respectively.The output end of the input unit is communicated with the input port of the stirring tank, and the input unit is used for inputting waste activated carbon into the stirring tank.The stirring unit is arranged in the stirring tank.The low-temperature plasma degradation unit is arranged at the central position of the stirring unit, and the discharge electrode is in a cylindrical structure.The gas inlet of the waste gas treatment unit is communicated with the output port of the stirring tank.The waste activated carbon regeneration process is combined with the low-temperature plasma, the organic pollutants in the waste gas generated in the waste activated carbon regeneration process are synchronously degraded, the energy utilization rate is high, the secondary pollution is small, and the subsequent waste gas treatment difficulty is low.

Description

Technical Field

[0001] This invention relates to the field of activated carbon regeneration technology, and in particular to a drum-stirred low-temperature plasma activated carbon particle regeneration device. Background Technology

[0002] Activated carbon, with its amorphous, disordered carbon structure, large specific surface area, and well-developed pore structure, possesses strong adsorption properties, making it a widely used industrial adsorbent. With China's rapid economic growth, its application areas are continuously expanding. Especially after the promulgation of relevant environmental protection regulations, the market demand for activated carbon in water treatment, solvent and waste gas recovery, and air purification has increased dramatically. However, the massive amounts of spent activated carbon after adsorbing pollutants have become a new type of industrial solid waste, and how to handle them is gradually becoming an urgent problem to be solved in the construction of "zero-waste cities." Generally, for spent activated carbon after adsorption saturation, two methods are used: activated carbon regeneration and incineration or landfill as hazardous waste. If waste activated carbon is not treated in a timely manner, it not only occupies valuable land resources but may also pollute the environment. Activated carbon regeneration removes pollutants adsorbed on the activated carbon from the pores while minimizing damage to the activated carbon's structure, restoring its adsorption performance and achieving reuse. This not only saves raw materials but also reduces environmental pollution. Waste activated carbon regeneration methods are generally divided into physical and chemical methods. Physical methods desorb adsorbents from spent activated carbon through high-temperature baking, steam carbonization, etc., mainly including thermal regeneration and microwave regeneration. Chemical methods, on the other hand, add chemical reagents to the physical methods to rapidly desorb adsorbents and regenerate the activated carbon, mainly including chemical oxidation regeneration, solvent regeneration, and electrochemical regeneration. All these methods suffer from problems such as decreased adsorption efficiency and high investment and operating costs.

[0003] Low-temperature plasma technology is a modern high-tech field. Low-temperature plasma contains various reactive substances, including electrons, ions, excited-state atoms, and highly oxidizing free radicals. These substances exhibit significant reactivity, enabling chemical reactions that are impossible or slow under conventional conditions to proceed efficiently. Based on an applied electric field, energetic electrons generated by dielectric discharge bombard pollutant molecules, causing ionization and dissociation reactions. These reactions then transform complex, large-molecule pollutants into simpler, safer small molecules, thereby degrading the pollutants.

[0004] Therefore, based on the difficulties in the disposal of waste activated carbon, low-temperature plasma technology is applied to the regeneration of waste activated carbon to develop a high-efficiency, low-energy-consumption method and device for the regeneration of waste activated carbon. Summary of the Invention

[0005] The purpose of this invention is to provide a drum-stirred low-temperature plasma activated carbon particle regeneration device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a drum-stirred low-temperature plasma activated carbon particle regeneration device, comprising:

[0007] A mixing tank, wherein the axis of the mixing tank is horizontally arranged, and the two ends of the mixing tank are respectively provided with a feed inlet and a discharge outlet;

[0008] The feeding unit has its output end connected to the inlet of the mixing tank, and the feeding unit is used to input waste activated carbon into the mixing tank;

[0009] A stirring unit is disposed inside the stirring tank;

[0010] A low-temperature plasma degradation unit is located at the center of the stirring unit;

[0011] An exhaust gas treatment unit, wherein the air inlet of the exhaust gas treatment unit is connected to the discharge outlet of the mixing tank;

[0012] The plasma discharge electrode has a cylindrical structure.

[0013] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the feeding unit includes a feeding bin, the feeding port at the bottom of the feeding bin is connected to the feeding port of the stirring tank through a feeding channel, the feeding bin is filled with waste activated carbon, a screw conveyor is rotatably arranged at the bottom of the feeding bin, the output end of the screw conveyor is correspondingly arranged with the feeding port at the bottom of the feeding bin, a first drive motor is fixedly connected to the outer wall of the feeding bin, and the output shaft of the first drive motor is drivenly connected to the screw conveyor.

[0014] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the stirring unit includes a transmission gear rotatably connected inside the stirring tank, a second motor is fixedly connected to the outer wall of the stirring tank, a drive gear is fixedly connected to the output shaft of the second motor, the outer wall of the stirring tank is provided with a toothed groove, the gear meshes with the toothed groove, and two sets of spiral stirring blades are installed on the inner wall of the stirring tank.

[0015] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the low-temperature plasma degradation unit includes a plasma power supply and a plasma discharge electrode disposed in the middle of the stirring tank. The high voltage of the plasma power supply is electrically connected to the plasma discharge electrode, and the low voltage of the plasma power supply is electrically connected to the inner wall of the stirring tank.

[0016] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the waste gas treatment unit includes an induced draft fan, the output end of the induced draft fan is connected to the discharge port of the stirring tank, the output end of the induced draft fan is connected to a waste gas purification device, the waste gas purification device is provided with a waste gas discharge port, and the waste gas purification device is provided with a waste gas detection device.

[0017] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the discharge port of the stirring tank is provided with spiral discharge blades.

[0018] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the outer surface of the plasma discharge electrode and the outer wall of the stirring tank are both covered with high-temperature resistant insulating material.

[0019] According to the drum-stirred low-temperature plasma activated carbon particle regeneration device provided by the present invention, the plasma power supply is a high-frequency high-voltage AC power supply with adjustable voltage and frequency.

[0020] The present invention discloses the following technical effects:

[0021] When this invention is used, the feeding unit inputs waste activated carbon into the mixing tank, the low-temperature plasma degradation unit ionizes the air to generate oxidizing ions, which, together with the stirring unit, degrade the organic matter in the waste activated carbon. At the same time, the generated waste gas is extracted and purified by the waste gas treatment unit and finally discharged.

[0022] Compared to the more commonly used thermal regeneration method, this invention eliminates the need for an additional heat source and strict oxygen control, simplifying the regeneration process. The equipment is simple, requires a small footprint, and meets the needs of large-scale engineering applications.

[0023] This invention utilizes low-temperature plasma technology, which has a good effect on treating highly toxic and recalcitrant organic matter, with low energy consumption, minimal activated carbon loss, and high regeneration efficiency; at the same time, it avoids excessive ablation of the carbon matrix and collapse of the pore structure.

[0024] This invention utilizes a combination of a stirred tank and low-temperature plasma to simultaneously degrade organic pollutants in the waste gas generated during the regeneration of waste activated carbon. This results in high energy utilization, minimal secondary pollution, and low difficulty in subsequent waste gas treatment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view of the drum-stirred low-temperature plasma activated carbon particle regeneration device of the present invention;

[0027] Figure 2 for Figure 1 Sectional view along the middle AA.

[0028] The components include: 1. First drive motor; 2. Waste activated carbon; 3. Feed hopper; 4. Screw conveyor; 5. Feed port; 6. Feeding channel; 7. Feed inlet; 8. Second drive motor; 9. Transmission gear; 10. Plasma discharge electrode; 11. Mixing tank; 12. Spiral mixing blades; 13. Drive gear; 14. Discharge port; 15. Plasma power supply; 16. Exhaust fan; 17. Waste gas purification device; 18. Waste gas detection device; and 19. Waste gas emission outlet. Detailed Implementation

[0029] 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, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-2 This invention provides a drum-stirred low-temperature plasma activated carbon particle regeneration device, comprising:

[0032] A mixing tank 11 is arranged horizontally along its axis, and a feed inlet 7 and a discharge outlet 14 are respectively provided at both ends of the mixing tank 11.

[0033] The feeding unit has its output end connected to the inlet 7 of the mixing tank 11. The feeding unit is used to feed the waste activated carbon 2 into the mixing tank 11.

[0034] A stirring unit is installed inside the stirring tank 11;

[0035] A low-temperature plasma degradation unit is located at the center of the stirring unit.

[0036] The exhaust gas treatment unit has its air inlet connected to the discharge outlet 14 of the mixing tank 11.

[0037] The plasma discharge electrode 10 has a cylindrical structure.

[0038] In use, the feeding unit introduces waste activated carbon 2 into the mixing tank 11. The low-temperature plasma degradation unit ionizes the air to generate oxidizing ions, which, in conjunction with the mixing unit, degrade the organic matter within the waste activated carbon 2. Simultaneously, the generated waste gas is extracted and purified by the waste gas treatment unit before being discharged. The pollutants adsorbed by the waste activated carbon are organic matter, excluding inorganic pollutants such as heavy metals, and its types include powdered, granular, and columnar activated carbon.

[0039] Further optimization of the scheme: the feeding unit includes a feeding hopper 3, the feeding port 5 at the bottom of the feeding hopper 3 is connected to the feeding port 7 of the mixing tank 11 through the feeding channel 6, the feeding hopper 3 is filled with waste activated carbon 2, a screw conveyor 4 is rotatably installed at the bottom of the feeding hopper 3, the output end of the screw conveyor 4 is correspondingly set with the feeding port 5 at the bottom of the feeding hopper 3, a first drive motor 1 is fixedly connected to the outer wall of the feeding hopper 3, and the output shaft of the first drive motor 1 is connected to the screw conveyor 4 for transmission.

[0040] Further optimization of the design: the screw conveyor 4 is equipped with a shaft helical blade to achieve horizontal conveying and simultaneously complete mixing and stirring; the end of the conveyor is equipped with a reverse helical blade to prevent powder from clogging the end.

[0041] Further optimization of the design includes a transmission gear 9 rotatably connected within a mixing tank 11. A second motor is fixedly connected to the outer wall of the mixing tank 11, and a drive gear 13 is fixedly connected to the output shaft of the second motor. The outer wall of the mixing tank 11 has toothed grooves, with the gear meshing with the grooves. Two sets of high and low blades 12 are installed on the inner wall of the mixing tank 11, arranged at a certain angle to the axis. During forward rotation, the blades 12 not only lift and lower the waste activated carbon but also force the material to move axially, thus enhancing the mixing effect. During reverse rotation, the blades 12 push the waste activated carbon towards the discharge port 14, which is equipped with two spiral discharge blades that intersect at 180° to discharge the activated carbon.

[0042] Further optimization of the scheme: the low-temperature plasma degradation unit includes a plasma power supply 15 and a plasma discharge electrode 10 disposed in the middle of the transmission gear 9. The high voltage of the plasma power supply 15 is electrically connected to the plasma discharge electrode 10, and the low voltage of the plasma power supply 15 is electrically connected to the inner wall of the stirring tank 11.

[0043] The plasma discharge electrode 10 is a hollow cylindrical shape, with its axis parallel to the stirred tank 11. The outer part of the plasma discharge electrode 10 is made of a high-temperature resistant insulating material, which serves as a barrier medium for discharge. The high-temperature resistant insulating material can be ceramic, quartz glass, or a polymer layer.

[0044] Further optimization of the scheme: the exhaust gas treatment unit includes an induced draft fan 16, the output end of which is connected to the discharge port 14 of the mixing tank 11, the output end of which is connected to an exhaust gas purification device 17, an exhaust gas discharge port 19 is provided on the exhaust gas purification device 17, and an exhaust gas detection device 18 is provided on the exhaust gas purification device 17.

[0045] After preliminary plasma treatment, the waste gas generated during activated carbon regeneration is drawn from the mixing tank 11 by the induced draft fan 16 and enters the waste gas purification device 17 for further treatment. The waste gas is then discharged from the exhaust port after the waste gas detection device 18 detects that the waste gas meets the emission standards.

[0046] The exhaust gas detection device 18 mainly detects particulate matter and volatile organic compounds in the purified exhaust gas. The pollutants adsorbed by the exhaust gas purification device 17 are organic matter and do not contain inorganic pollutants such as heavy metals.

[0047] The design was further optimized by covering the outside of the plasma discharge electrode 10 and the outer wall of the stirring tank 11 with a high-temperature resistant insulating material.

[0048] Further optimization of the scheme: the plasma power supply 15 is a high-frequency, high-voltage AC power supply with adjustable voltage and frequency.

[0049] Specific implementation process:

[0050] Waste activated carbon 2 awaiting disposal in the feeding hopper 3 is added to the mixing tank 11 for regeneration via a screw conveyor 4 at regular intervals and in measured quantities. The mixing tank 11 rotates at low speed in the forward direction driven by a motor, continuously stirring and mixing the waste activated carbon 2 inside. Under a high AC voltage, the air between the plasma discharge electrode 10 and the inner wall of the mixing tank 11 is broken down, generating a discharge and forming a stable discharge channel, resulting in a significant dielectric barrier plasma discharge reaction. Inside the stirred tank 11, air and water vapor are extensively ionized, forming a large number of high-energy electrons, active free radicals such as ·OH, ·O, and HO2·, as well as highly oxidizing substances like O3 and H2O2. Because these substances have strong oxidizing and reactive properties, they can effectively degrade the organic pollutants adsorbed in the spent activated carbon 2 and those released into the air during regeneration into the stirred tank 11. Furthermore, this reaction process is accompanied by localized high temperature and pressure, strong shock waves, and ultraviolet radiation. When these effects act on the activated carbon surface, they not only cause physical impacts but also chemically erode the surface. This effectively removes pollutants from the pores of the spent activated carbon 2. Moreover, the plasma-treated activated carbon exhibits a significant increase in specific surface area and micropore volume, along with a higher concentration of acidic functional groups, which helps improve its adsorption performance. After the spent activated carbon 2 has passed regeneration treatment, the stirred tank 11 rotates in reverse to discharge the activated carbon from the outlet 14.

[0051] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A drum-stirred low-temperature plasma activated carbon particle regeneration device, characterized in that, include: A mixing tank (11) is arranged horizontally along its axis, and a feed inlet (7) and a discharge outlet (14) are respectively provided at both ends of the mixing tank (11). The feeding unit is connected to the inlet (7) of the mixing tank (11) at its output end. The feeding unit is used to feed waste activated carbon (2) into the mixing tank (11). A stirring unit is disposed inside the stirring tank (11); A low-temperature plasma degradation unit is located at the center of the stirring unit; The exhaust gas treatment unit is connected to the discharge port (14) of the mixing tank (11). The stirring unit includes a transmission gear (9) rotatably connected inside the stirring tank (11). A second motor is fixedly connected to the outer wall of the stirring tank (11), and a drive gear (13) is fixedly connected to the output shaft of the second motor. The outer wall of the stirring tank (11) is provided with tooth grooves, and the gear meshes with the tooth grooves. Two sets of spiral stirring blades (12) are installed on the inner wall of the stirring tank (11). The low-temperature plasma degradation unit includes a plasma power supply (15) and a plasma discharge electrode (10) disposed in the middle of the stirring tank (11). The high-voltage end of the plasma power supply (15) is electrically connected to the plasma discharge electrode (10), and the low-voltage end of the plasma power supply (15) is electrically connected to the inner wall of the stirring tank (11). The plasma power supply (15) is a high-frequency high-voltage AC power supply with adjustable voltage and frequency. The plasma discharge electrode (10) has a cylindrical structure.

2. The drum-stirred low-temperature plasma activated carbon particle regeneration device according to claim 1, characterized in that: The feeding unit includes a feeding hopper (3), the feeding port (5) at the bottom of the feeding hopper (3) is connected to the feeding port (7) of the mixing tank (11) through a feeding channel (6), the feeding hopper (3) is filled with waste activated carbon (2), a screw conveyor (4) is rotatably installed at the bottom of the feeding hopper (3), the output end of the screw conveyor (4) is correspondingly set with the feeding port (5) at the bottom of the feeding hopper (3), a first drive motor (1) is fixedly connected to the outer wall of the feeding hopper (3), and the output shaft of the first drive motor (1) is connected to the screw conveyor (4) in a transmission connection.

3. The drum-stirred low-temperature plasma activated carbon particle regeneration device according to claim 1, characterized in that: The exhaust gas treatment unit includes an induced draft fan (16), the output end of which is connected to the discharge port (14) of the mixing tank (11), the output end of which is connected to an exhaust gas purification device (17), the exhaust gas purification device (17) is provided with an exhaust gas discharge port (19), and the exhaust gas purification device (17) is provided with an exhaust gas detection device (18).

4. The drum-stirred low-temperature plasma activated carbon particle regeneration device according to claim 1, characterized in that: The discharge port (14) of the mixing tank (11) is equipped with spiral discharge blades.

5. The drum-stirred low-temperature plasma activated carbon particle regeneration device according to claim 1, characterized in that: The plasma discharge electrode (10) and the outer wall of the stirring tank (11) are both covered with high-temperature resistant insulating material.

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