Method and device for regenerating waste activated carbon by microwave-induced plasma

Abstract

The invention discloses a method and a device for regenerating waste activated carbon by microwave-induced plasma, and the device comprises a box body, a regeneration barrel, a regenerated carbon collection container, a microwave generator, a temperature detector, an inert gas inlet and a tail gas treatment mechanism, the regenerated carbon is obtained by carrying out regeneration treatment on pretreated to-be-regenerated activated carbon with the water content of 5-15% by adopting microwaves under an anaerobic condition. According to the method, water molecules are induced and dissociated to generate a large number of plasma free radicals under the combined action of microwave induction and point discharge of the irregular surface of the activated carbon by utilizing the good wave absorbing property of the activated carbon and water, so that adsorption sites of the waste activated carbon are released again, new adsorption sites are generated, and the regeneration effect is excellent. According to the method, the regeneration efficiency is close to 100% under the optimal condition, compared with traditional thermal regeneration, the single-time regeneration energy consumption can be saved by 80% or above, the regeneration time can be shortened by 75% or above, and the method is environmentally friendly, efficient and wide in prospect.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon regeneration, and in particular to a method and a device for regenerating waste activated carbon by microwave-induced plasma. Background Art

[0002] Activated carbon is widely used in air pollution control, solvent recovery, food processing, metal recovery, catalysis and wastewater treatment due to its developed pore structure, huge specific surface area, excellent adsorption performance, simple adsorption equipment and convenient operation. Common adsorbents include formaldehyde, toluene, dyes, heavy metals, detergents, herbicides, pesticides, fluorides and polycyclic aromatic hydrocarbons. It is also often used in some combustion exhaust gas treatment to remove heavy metals and dioxins in flue gas.

[0003] However, the adsorption capacity of activated carbon is limited. When the adsorption of activated carbon reaches its limit, it becomes saturated activated carbon, which can also be called waste activated carbon. Waste activated carbon is classified as solid waste, and even hazardous solid waste depending on the type of adsorbent. However, most of the waste activated carbon is usually landfilled or incinerated, and only a small part can be recycled. However, whether it is landfilling or incineration, it is a waste of resources and may cause secondary pollution to the environment.

[0004] The current mainstream regeneration methods include chemical regeneration and thermal regeneration. Although both have been applied on an industrial scale, their shortcomings are equally significant. The chemical regeneration method does not completely dissolve and remove the adsorbed solutes, and the regeneration cost is high and the regeneration solvent is difficult to recover. During the regeneration process, pollutants will enter the regeneration solution, which may cause secondary pollution if not handled properly. Although the thermal regeneration method uses an external heat source to volatilize and remove some of the adsorbed organic solutes, it consumes energy and has high costs. In addition, during the regeneration process, some organic solutes are easily carbonized by heat to block the pores and active adsorption sites, resulting in a sharp drop in regeneration efficiency and the quality of the regenerated carbon. In addition, the thermal regeneration method has a huge equipment scale and high energy consumption, and the economy of regeneration can only be guaranteed under the premise of large-scale regeneration.

[0005] The microwave regeneration technology developed on the basis of thermal regeneration method utilizes the good wave absorption properties of activated carbon itself to convert microwave energy into heat. It has the advantages of short regeneration time, regeneration efficiency not affected by scale effect, green energy saving, etc. However, it still has not solved the difficulties such as low regeneration efficiency and poor regeneration effect caused by the heat-based regeneration principle.

[0006] In view of this, it is necessary to design a method and device for regenerating waste activated carbon by microwave induced plasma to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide a method and device for regenerating waste activated carbon by microwave induced plasma, which can achieve efficient regeneration of waste activated carbon in a relatively short time, significantly reduce the energy consumption required for regeneration of waste activated carbon, and effectively increase the regeneration efficiency of waste activated carbon.

[0008] To achieve the above-mentioned object of the invention, the present invention provides a method for regenerating waste activated carbon by microwave-induced plasma, comprising the following steps: S1. Pre-treating the waste activated carbon to obtain activated carbon to be regenerated with a moisture content of 5-15%; S2. The activated carbon to be regenerated obtained in step S1 is regenerated by microwave treatment under anaerobic conditions to obtain regenerated carbon.

[0009] As a further improvement of the present invention, in step S1, the pretreatment operation is: evenly loading 5-15% of water on the waste activated carbon and then performing a static aging treatment.

[0010] As a further improvement of the present invention, the static aging time is 5-30 min. The static aging treatment allows water to fully penetrate into the pores of the activated carbon, so as to facilitate the subsequent regeneration treatment using microwaves, wherein the static aging time is controlled to avoid the regeneration effect being affected by insufficient penetration of water into the pores of the activated carbon due to the static aging time being too short.

[0011] As a further improvement of the present invention, in step S2, the regeneration process operation includes a temperature rising process and a regeneration process, the regeneration temperature of the regeneration process is 600-800°C, and the regeneration time is 1-5min.

[0012] As a further improvement of the present invention, the microwave power in the heating process is 800-1000W; and the microwave power in the regeneration process is greater than or equal to 400W.

[0013] The present invention also provides a device for the method of microwave-induced plasma regeneration of waste activated carbon, comprising: A box body, wherein a top cover is arranged on the top of the box body; A regeneration barrel is arranged in the box body, and the regeneration barrel is connected to the box body through a rotating structure, so that the regeneration barrel can rotate relative to the box body under the control of the rotating structure; the regeneration barrel is also provided with a discharge port, and a valve with a vent hole on a valve plate is installed at the discharge port; A regenerated carbon collection container, located below the discharge port; A microwave generator is arranged on the box; A temperature detector, used to detect the temperature of the regeneration process; An inert gas inlet is arranged on the regenerated carbon collection container; The tail gas treatment mechanism is connected with the regeneration barrel to treat the tail gas generated in the regeneration barrel.

[0014] As a further improvement of the present invention, it further comprises a sealing member, wherein two sealing members are vertically spaced apart and arranged between the box body and the regeneration barrel, so that a sealed space for installing the microwave generator is formed between the box body and the regeneration barrel.

[0015] As a further improvement of the present invention, the sealing member is a rotating sealing ring.

[0016] As a further improvement of the present invention, the top cover is provided with an opening for the temperature detector to extend into the regeneration barrel.

[0017] As a further improvement of the present invention, a heat-insulating layer is provided on both the box body and the top cover.

[0018] As a further improvement of the present invention, an anti-backflow structure is provided on the exhaust gas treatment mechanism.

[0019] The beneficial effects of the present invention are: 1. The present invention utilizes the good wave absorption of activated carbon and water itself to load a certain amount of water on the waste activated carbon. Under the combined action of microwave induction and "tip discharge" on the irregular surface of activated carbon, water molecules are induced to dissociate to generate a large number of plasma free radicals. Under the combined action of high temperature and plasma free radicals, the organic adsorbent on the waste activated carbon is desorbed and decomposed, the adsorption sites of the waste activated carbon are released again, and new adsorption sites are generated through the surface modification of plasma free radicals, which significantly improves the regeneration effect of the waste activated carbon, so that the regeneration efficiency of the waste activated carbon under optimal conditions is close to 100%. Compared with simple microwave regeneration, the regeneration effect of the microwave-induced plasma regeneration method for waste activated carbon is generally improved by 5-20%, and the regeneration energy consumption is low. Compared with traditional thermal regeneration, the energy consumption can be saved by more than 80%, and the regeneration time can be shortened by more than 75%, which is more green and efficient.

[0020] 2. The device for regenerating waste activated carbon by microwave induced plasma provided by the present invention has a simple structure, few parts, convenient maintenance, convenient and safe operation, rapid temperature rise during the regeneration process, and little damage to the activated carbon due to low-speed rotation; the device is equipped with an exhaust gas treatment device, which can effectively prevent secondary pollution from exhaust gas, and is green, energy-saving, environmentally friendly, safe and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the device for regenerating waste activated carbon by microwave induced plasma.

[0022] Figure 2 Schematic diagram of the internal structure of the box.

[0023] Figure 3 Schematic diagram of the front view and top view of the filter in the open state.

[0024] Figure 4 The regeneration rate test results of waste activated carbon with different moisture contents.

[0025] Figure 5 The results of the heating rate test of waste activated carbon with different moisture contents.

[0026] Reference numerals 10. Box body; 11. Top cover; 112. Sealing lock; 12. Insulation layer; 13. Seal; 14. Exhaust port; 15. Base; 20. Regeneration barrel; 21. Discharge port; 30. Cavity; 41. Rotating motor; 42. Transmission belt; 43. Annular groove; 51. Translation structure; 52. Filter; 60. Regeneration carbon collection container; 61. Inert gas inlet; 62. Gas cylinder; 71. Magnetron; 72. Thermocouple; 80. Control structure; 90. Exhaust treatment mechanism. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0029] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0030] Example 1 like Figure 1 and Figure 2 As shown, the present invention provides a device for regenerating waste activated carbon by microwave-induced plasma, comprising: A box body 10, wherein a top cover 11 is provided on the top of the box body 10; The regeneration barrel 20 is arranged in the box body 10, and the regeneration barrel 20 is connected to the box body 10 through a rotating structure, so that under the control of the rotating structure, the regeneration barrel 20 can rotate relative to the box body 10; the regeneration barrel 20 is provided with a discharge port 21, and a valve with a vent hole on the valve plate is installed at the discharge port 21; A regenerated carbon collection container 60, located below the discharge port 21; A microwave generator is provided on the housing 10 and is used to regenerate the activated carbon to be regenerated in the regeneration barrel 20; A temperature detector, used to detect the temperature of the regeneration process; An inert gas inlet 61 is provided on the regenerated carbon collecting container 60; The tail gas treatment mechanism 90 is connected to the regeneration barrel 20 to treat the tail gas generated in the regeneration barrel 20 .

[0031] Specifically, the regenerated carbon collection container 60 is arranged at the lower part of the box body 10, and is used to receive the regenerated carbon discharged from the discharge port 21; the box body 10 is provided with an open port on the side away from the inert gas inlet port 61, and the open port is provided with a door body for controlling the conversion of the open port between an open state and a closed state. The regenerated carbon collection container 60 is an existing pull-out design, so that when the door body is opened to make the open port in an open state, the regenerated carbon collection container 60 can be moved laterally out of the box body 10 to facilitate the collection of the regenerated carbon; four bases 15 are provided at the bottom of the box body 10, so that the regenerated carbon collection container 60 has a certain distance from the ground to facilitate the withdrawal of the regenerated carbon collection container 60 to collect the regenerated carbon.

[0032] Specifically, one end of the top cover 11 is connected to the box body 10 through a rotating pair, so that under the action of external force, the top cover 11 can be opened upward to facilitate the placement of the activated carbon to be regenerated into the regeneration barrel 20. A sealing lock 112 is also provided on the top cover 11, and an opening is provided in the middle of the top cover 11 for the temperature detector to extend into the regeneration barrel 20.

[0033] Exemplarily, the temperature detector is a thermocouple 72, which is installed on the top cover 11 and coincides with the rotation center of the regeneration barrel 20, and the thermocouple 72 can be pushed and pulled from the outside of the box body 10 to adjust the height of the bottom end of the thermocouple 72; the opening size is slightly larger than the size of the thermocouple 72, and a limiting member is provided at the opening. Exemplarily, the limiting member is a silicone sealing ring with an inner diameter slightly smaller than the outer diameter of the thermocouple 72, so that when the thermocouple 72 is installed at the opening, the opening is in a closed state, and the limiting effect of the silicone sealing ring can be utilized so that after the height of the thermocouple 72 is adjusted under the action of external force and the external force is removed, the thermocouple 72 can maintain a relatively stable state.

[0034] Specifically, the box body 10 is also provided with a door switch mechanism similar to that on a refrigerator, so that the microwave can be turned on only when the top cover 11 is in a closed state and the regenerated carbon collection container 60 is installed in place. When the top cover 11 or the regenerated carbon collection container 60 is opened, the power is automatically cut off to prevent microwave leakage.

[0035] Specifically, the box body 10 and the top cover 11 are both provided with an insulation layer 12. Exemplarily, the insulation layer 12 is arranged around the outer circumference of the regeneration barrel 20 to insulate the regeneration barrel 20 in all directions during the regeneration process and maintain the temperature of the activated carbon during the regeneration process. Exemplarily, the microwave generator is a magnetron 71, and a position for installing the magnetron 71 is reserved in the insulation layer 12. Three magnetrons 71 are arranged at intervals along the circumference of the regeneration barrel 20. The three microwave sources constitute a multi-mode microwave regeneration system, which, in conjunction with the low-speed rotation of the regeneration barrel 20, can make the activated carbon more evenly heated and the overall regeneration effect better.

[0036] Specifically, it also includes a seal 13, two seals 13 are arranged vertically and spaced apart between the box 10 and the regeneration barrel 20, so that a sealed space for installing the magnetron 71 is formed between the box 10 and the regeneration barrel 20; exemplary, the seal 13 is a rotating seal ring; the top of the regeneration barrel 20 is open. The seal 13 forms a sealed space between the regeneration barrel 20 and the side wall of the box 10, and the magnetron 71 is installed in the sealed space, which can isolate the magnetron 71 from the regeneration barrel 20, and prevent the gas generated during the regeneration process from escaping to the magnetron 71 through the top of the regeneration barrel 20 to affect the service life of the magnetron 71.

[0037] Specifically, the aperture of the air holes on the valve plate is smaller than the aperture of the activated carbon, so that during the regeneration process, when the valve is in a closed state, the inert gas can enter the regeneration barrel through the air holes to remove the air in the regeneration barrel. Exemplarily, the valve can be a filter screen 52 controlled by the translation structure 51, so that under the action of the translation structure 51, the filter screen 52 switches between a closed state covering the discharge port 21 and an open state opening the discharge port 21.

[0038] Specifically, a cavity 30 is provided in the box body 10 below the regeneration barrel 20, and a rotating structure, a translation structure 51 and a filter screen 52 are arranged in the cavity 30, and a through hole is provided on the side wall of the cavity 30 for the filter screen 52 to extend to cover the discharge port 21. At the same time, a maintenance window is provided on the box body 10 corresponding to the rear side of the cavity 30, so that when the rotating structure, the translation structure 51 and the filter screen 52 need to be repaired, the maintenance window can be opened for corresponding processing.

[0039] Specifically, the rotating structure is an existing structure capable of driving the regeneration barrel 20 to rotate relative to the housing 10. For example, the regeneration barrel 20 is provided with an annular groove 43 ( Figure 3 ), the rotating structure includes a rotating motor 41, which is connected to the annular groove 43 through a transmission belt 42 to drive the regeneration barrel 20 to rotate through the rotating motor 41, and then the rotating motor 41 can be used to control the regeneration barrel 20 to rotate at a low speed during the entire regeneration process.

[0040] The translation structure 51 is an existing structure capable of driving the filter screen 52 to move horizontally and reciprocatingly, which will not be described in detail herein. The translation structure 51 controls the movement of the filter screen 52 to control the regenerated carbon to be discharged from the regeneration barrel 20 to the regeneration carbon collection container 60 as required.

[0041] Specifically, the inert gas inlet 61 penetrates the box body 10 and is connected to the gas delivery pipeline, and a solenoid valve for controlling its connection state is provided at the inert gas inlet 61 , and the gas delivery pipe is connected to the gas cylinder 62 away from the inert gas inlet 61 .

[0042] The top of the box 10 is provided with an exhaust port 14, the exhaust treatment mechanism 90 is suspended on the outside of the box 10 and connected to the exhaust port 14 through an exhaust delivery pipe, and an anti-backflow structure is also provided at the exhaust port 14. For example, the anti-backflow structure is a one-way valve. The upper part of the exhaust treatment mechanism 90 is also provided with an opening for discharging clean exhaust gas and adding exhaust treatment liquid.

[0043] Exemplarily, the inert gas is nitrogen.

[0044] Specifically, it also includes a control structure 80 for realizing automatic control of the regeneration process. The control structure 80 is installed on the front of the box 10, and is connected to the thermocouple 72, the magnetron 71, the translation structure 51 and the rotation structure, so that the control structure 80 can be used to control the working state of the thermocouple 72, the magnetron 71, the translation structure 51 and the rotation structure, and the control structure 80 can also adjust the power of the magnetron 71 and the temperature during the regeneration process; the control structure 80 is also provided with an emergency stop button and an over-temperature automatic shutdown function. Exemplarily, the control structure 80 is a structure similar to the existing controller structure for regulating the operation of related equipment. When it is necessary to regenerate the activated carbon to be regenerated, after setting the regeneration temperature, heating power and regeneration time according to needs, the control structure 80 controls the magnetron 71 to work so that the waste activated carbon quickly reaches the regeneration temperature according to the heating power, and then adjusts the power to maintain the regeneration temperature; in addition, when performing the regeneration process, under the control of the control structure 80, the translation structure 51 drives the filter 52 to move so that the filter 52 is in a closed state and the rotating structure controls the regeneration barrel 20 to rotate at a low speed; if the temperature soars to 1000°C during regeneration, the magnetron 71 will automatically shut down due to over-temperature to prevent danger, and the emergency stop button set can instantly shut down at any time.

[0045] When the regeneration process is completed and the regenerated carbon needs to be discharged into the regenerated carbon collection container 60, under the control of the control structure 80, the translation structure 51 drives the filter screen 52 to move to make the filter screen 52 in an open state ( Figure 3 ), the rotating structure controls the rotation of the regeneration barrel 20 to discharge the regenerated carbon that has completed regeneration in the regeneration barrel 20 into the regenerated carbon collecting container 60.

[0046] In addition, before the regeneration process is carried out, the air in the regeneration barrel 20 needs to be removed. The specific operation is: control the solenoid valve to open so that the gas cylinder is connected to the inert gas inlet 61. After the nitrogen in the gas cylinder 62 enters the regenerated carbon collection container 60 through the inlet, it passes through the filter 52 located at the discharge port 21 and enters the regeneration barrel 20, and then is discharged to the exhaust gas treatment device through the exhaust port 14. In this process, the gas blows out the air in the regeneration barrel 20 at a specific rate within a specific time according to the volume of the box body 10.

[0047] Specifically, the outer and inner surfaces of the box 10 are made of stainless steel to prevent microwave leakage. The top cover 11 and the regenerated carbon collection container 60 are also made of stainless steel, the regeneration barrel 20 is made of glass or quartz, and the tail gas treatment mechanism 90 is made of high temperature resistant plastic.

[0048] Example 2 The present invention also provides a method for microwave-induced plasma regeneration of waste activated carbon. The method for microwave-induced plasma regeneration of waste activated carbon in this embodiment is described in detail in conjunction with a device for microwave-induced plasma regeneration of waste activated carbon.

[0049] The specific steps are as follows: after the waste activated carbon is washed and dried for pre-treatment, 5% water is evenly loaded on the waste activated carbon by spraying, and then the waste activated carbon is allowed to stand for aging for 30 minutes to obtain activated carbon to be regenerated with a moisture content of 5%; the top cover 11 is opened, the activated carbon to be regenerated is placed in the regeneration barrel 20, the top cover 11 is closed, the sealing lock 112 is closed to check the air tightness, the thermocouple 72 is placed in the opening and the extension length of the thermocouple 72 is adjusted according to the amount of activated carbon to be regenerated in the regeneration barrel 20; the solenoid valve is adjusted to connect the gas cylinder 62 with the regeneration carbon collection container 60, and the gas flow rate is adjusted to discharge the air in the regeneration barrel 20 so that the regeneration barrel 20 is in an oxygen-free state; the regeneration temperature is set to 800°C in the control structure 80, The heating power is 900W, and after the regeneration time is 5min, the magnetron 71 is controlled to start working, and the regeneration barrel 20 is controlled to rotate at a low speed through the rotating structure; when the temperature reaches the set temperature of 800℃, the microwave power is adjusted to >400W to ensure the continuous existence of plasma; after the regeneration is completed, the regeneration barrel 20 stops rotating, and the nitrogen is kept flowing until the temperature of the activated carbon drops to room temperature and then the air intake is stopped; then, under the regulation of the control structure 80, the translation structure 51 drives the filter screen 52 to move until the filter screen 52 is in an open state, and at the same time, the rotating structure controls the regeneration barrel 20 to rotate, so that the regenerated carbon falls into the regenerated carbon collection container 60 through the discharge port 21, and the regenerated carbon collection container is extracted after the carbon discharge structure to obtain the regenerated carbon.

[0050] Embodiment 3-4 Examples 3 and 4 respectively provide a method for regenerating waste activated carbon by microwave induced plasma. Compared with Example 2, the moisture content of the activated carbon to be regenerated in Examples 3 and 4 is adjusted from 5% to 10% and 15%, respectively. The remaining steps are consistent with Example 2 and are not repeated here.

[0051] Comparative Example 1-2 Comparisons 1 and 2 respectively provide a method for regenerating waste activated carbon by microwave induced plasma. Compared with Example 2, the moisture content of the activated carbon to be regenerated in Comparative Examples 1 and 2 is adjusted from 5% to 0 and 20%, respectively. The remaining steps are consistent with Example 2 and are not repeated here.

[0052] The regeneration rate of the regenerated carbon obtained in Example 2-4 and Comparative Example 1-2 was detected, and the temperature rise state of the regeneration treatment of Example 2-4 and Comparative Example 1-2 was detected. The regeneration rate detection results and the temperature rise state detection results of Example 2-4 and Comparative Example 1-2 are respectively as follows: Figure 4 and Figure 5 shown.

[0053] Regeneration efficiency (RE) is defined as the ratio of the specific substance adsorption capacity of the regenerated carbon to that of the original activated carbon, and is calculated as follows:

[0054] Among them, q e,r and q e,v are the adsorption capacities of regenerated carbon and original activated carbon, respectively.

[0055] like Figure 4 As shown in the figure, when the moisture content of the activated carbon to be regenerated is in the range of 5-15%, the regeneration rate of the obtained regenerated carbon is above 90%, and when the moisture content is 15%, the regeneration rate of the waste activated carbon is close to 100%, and the regeneration effect is significant. When the moisture content increases to 20%, the regeneration rate decreases significantly, and when the moisture content is 0, the regeneration rate is also relatively low. This may be because when the moisture content is too high, a boiling-like reaction will occur during the regeneration period, which is too intense, reducing the regeneration effect. When the moisture content is low, the microwave cannot effectively induce water to produce plasma free radicals, and the regeneration effect cannot be improved.

[0056] The present invention is based on the combined effect of the induction of microwaves during microwave regeneration and the "tip discharge" effect on the irregular surface of activated carbon, which can directionally induce the dissociation of water molecules to produce a large number of plasma free radicals, in situ decompose and desorb pollutants to release the adsorption sites of activated carbon, and at the same time etch and modify the surface of activated carbon to generate new functional groups and thus new adsorption sites, thereby efficiently completing the regeneration of waste activated carbon.

[0057] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for regenerating waste activated carbon by microwave induced plasma, characterized in that: The following steps are involved: S1. Pre-treating the waste activated carbon to obtain activated carbon to be regenerated with a moisture content of 5-15%; S2. The activated carbon to be regenerated obtained in step S1 is regenerated by microwave treatment under anaerobic conditions to obtain regenerated carbon.

2. The method for regenerating waste activated carbon by microwave induced plasma according to claim 1, characterized in that: In step S1, the pretreatment operation is: evenly load 5-15% of water on the waste activated carbon and then perform a static aging treatment.

3. The method for regenerating waste activated carbon by microwave induced plasma according to claim 2, characterized in that: The standing aging time is 5-30 minutes.

4. The method for regenerating waste activated carbon by microwave induced plasma according to claim 1, characterized in that: In step S2, the regeneration process includes a temperature rising process and a regeneration process. The regeneration temperature of the regeneration process is 600-800°C and the regeneration time is 1-5 minutes.

5. The method for regenerating waste activated carbon by microwave induced plasma according to claim 4, characterized in that: The microwave power in the heating process is 800-1000W; the microwave power in the regeneration process is greater than or equal to 400W.

6. A device for the method of microwave induced plasma regeneration of waste activated carbon according to claim 1, characterized in that: include: A box body, wherein a top cover is arranged on the top of the box body; A regeneration barrel is arranged in the box body, and the regeneration barrel is connected to the box body through a rotating structure, so that the regeneration barrel can rotate relative to the box body under the control of the rotating structure; a discharge port is arranged on the regeneration barrel, and a valve with air holes on a valve plate is installed at the discharge port; A regenerated carbon collection container, located below the discharge port; A microwave generator is arranged on the box; A temperature detector, used to detect the temperature of the regeneration process; An inert gas inlet is arranged on the regenerated carbon collection container; The tail gas treatment mechanism is connected with the regeneration barrel to treat the tail gas generated in the regeneration barrel.

7. The device for the method of regenerating waste activated carbon by microwave induced plasma according to claim 6, characterized in that: The utility model also comprises a sealing member, wherein two sealing members are vertically spaced apart and arranged between the box body and the regeneration barrel, so that a sealed space for installing the microwave generator is formed between the box body and the regeneration barrel.

8. The device for the method of regenerating waste activated carbon by microwave induced plasma according to claim 7, characterized in that: The sealing member is a rotating sealing ring.

9. The device for the method of regenerating waste activated carbon by microwave induced plasma according to claim 6, characterized in that: The top cover is provided with an opening for the temperature detector to extend into the regeneration barrel.

10. The device for the method of regenerating waste activated carbon by microwave induced plasma according to claim 6, characterized in that: The box body and the top cover are both provided with a heat-insulating layer.

Images