A heat-cyclable activated carbon regeneration device and process thereof

Abstract

This invention discloses a thermally recyclable activated carbon regeneration device and its process, specifically relating to the field of activated carbon regeneration. The device comprises a vertical furnace body, internally arranged from top to bottom as a preheating and dehydration section, an electrothermal regeneration section, and a cooling and discharge section. A drive shaft is positioned along the furnace body axis and passes through the preheating and dehydration section, the electrothermal regeneration section, and the cooling and discharge section. The preheating and dehydration section contains multiple layers of preheating plates to extend the falling path of the activated carbon, including preheating plate one and preheating plate three with openings facing the top of the furnace body, and preheating plate two with openings facing the bottom of the furnace body. The drive shaft passes through the center of each preheating plate. Preheating plate one and preheating plate three have gaps between themselves and the drive shaft to allow activated carbon to fall. Preheating plate two has holes at its edge for activated carbon to fall. The activated carbon falls layer by layer in a zigzag path, extending the residence time in the preheating and cooling sections, ensuring sufficient preheating and dehydration and uniform cooling.

Description

Technical Field

[0001] This invention relates to the field of activated carbon regeneration technology, and more specifically, to a thermally recyclable activated carbon regeneration device and process. Background Technology

[0002] Activated carbon, as a porous adsorbent material, is widely used in water treatment, waste gas treatment, and chemical decolorization. After a period of use, activated carbon reaches adsorption saturation and needs to be regenerated to restore its adsorption capacity and reduce operating costs.

[0003] Currently, the main methods for regenerating activated carbon include thermal regeneration, solvent regeneration, and biological regeneration. Among them, thermal regeneration is the most widely used and most stable regeneration method in industry. Its basic principle is to use high temperature to thermally decompose, desorb, or carbonize the organic matter on the surface or in the pores of the saturated activated carbon, thereby reopening the pore structure of the activated carbon.

[0004] In electrothermal regeneration schemes, the electrode arrangement often leads to unclear current paths, resulting in heat concentration in localized areas. This causes some activated carbon to overheat and burn while others are underheated. In steam regeneration schemes, fixed gas distribution devices (such as branched gas distribution pipes) are easily bent and deformed under the pressure of the activated carbon pile, leading to uneven gas supply and further exacerbating the problem of uneven heating. These issues result in significant fluctuations in the adsorption performance of the regenerated activated carbon, making it difficult to meet the requirements of stable industrial production.

[0005] Therefore, developing an activated carbon regeneration device and process with high thermal efficiency, uniform heating, low energy consumption, and suitability for continuous production is of great practical significance. Summary of the Invention

[0006] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a thermally recyclable activated carbon regeneration device that recovers waste heat through tail gas recirculation and utilizes the inherent resistance of the activated carbon for uniform heating, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a thermally recyclable activated carbon regeneration device, comprising: The vertical furnace body is divided into a preheating and dehydration section, an electric heating and regeneration section, and a cooling and discharge section from top to bottom. The drive shaft is set along the furnace body axis and passes through the preheating and dehydration section, the electric heating regeneration section and the cooling and discharge section; The preheating and dehydration section is equipped with multi-layer preheating plates for extending the falling path of activated carbon, including preheating plate one and preheating plate three with openings facing the top of the furnace body, and preheating plate two with openings facing the bottom of the furnace body; the drive shaft passes through the center of each preheating plate, and there are gaps between preheating plate one and preheating plate three and the drive shaft for activated carbon to fall, and holes for activated carbon to fall are opened at the edge of preheating plate two. The electrothermal regeneration section is equipped with a regeneration material holding plate. The main body of the regeneration material holding plate is made of insulating and heat-resistant material. Multiple conductive electrode contacts are embedded in its bottom, and annular graphite electrodes are attached and fixed to the inner wall surface. Multiple discharge ports are opened at the bottom. A base is fixed on the drive shaft, and multiple working arms are provided on the base. The working arms are made of insulating material, and their ends are bent and extended to the discharge ports. Some working arms have plugs at their ends for intermittently blocking the discharge ports. The cooling discharge section is equipped with multiple cooling plates, and the outer wall of the furnace body is equipped with a water-cooled jacket. The furnace body is equipped with a pipe connecting the preheating section and the regeneration section, and the top of the preheating and dehydration section is equipped with an exhaust gas outlet.

[0008] In a preferred embodiment, the preheating and dehydration section further includes a valve assembly for controlling the intermittent falling of activated carbon. The valve assembly includes a sleeve and a valve component fitted onto the upper section of the drive shaft. The sleeve is fixedly assembled to the top of the furnace body, and the valve component is slidably connected to the drive shaft via a keyway structure and rotates synchronously with the drive shaft. The valve component has a frustum structure, and its bottom diameter is larger than the diameter of the bottom opening of the preheating plate. The mating ends of the sleeve and the valve component are respectively provided with matching continuous wave-shaped crests and troughs. A spring is also fitted onto the drive shaft, and the valve component has a stepped structure inside for limiting the spring. When the drive shaft rotates, it drives the valve component to rotate. Since the sleeve is fixed, the valve component moves continuously up and down along the axial direction under the cooperation of the spring, controlling the gap between the valve component and the bottom opening of the preheating plate, thereby realizing the intermittent falling of activated carbon.

[0009] In a preferred embodiment, a shelf is provided between the preheating dehydration section and the electrothermal regeneration section. The shelf is made of an insulating and heat-resistant material. The top of the shelf is provided with a frustum-shaped edge to prevent activated carbon from scattering onto the shelf.

[0010] In a preferred embodiment, the recycled material holding plate adopts a conical material holding structure with a cylindrical structure extending from the top to increase the material storage capacity; the discharge port at the bottom of the recycled material holding plate is opened at an equal angle; the annular graphite electrode is attached and fixed to the inner wall surface of the recycled material holding plate, and the activated carbon is in direct contact with the electrode; or the annular graphite electrode can be directly used as the inner wall of the recycled material holding plate, forming a direct conductive contact with the activated carbon; when energized, the current is introduced from the bottom electrode contact to the bottom of the activated carbon pile, and then conducted from bottom to top through the activated carbon pile to the annular graphite electrode, forming a complete current loop.

[0011] In a preferred embodiment, the working arm is made of ceramic or a metal material with an insulating coating. When the working arm rotates, it can agitate the activated carbon, break the fixed contact points between the activated carbon particles, and cause the particles to rearrange continuously, thus changing the current path. The plug intermittently blocks the feed port as the working arm rotates, controlling the residence time of the activated carbon in the regeneration section.

[0012] In a preferred embodiment, the multi-layer cooling plates arranged in the cooling discharge section include a first cooling plate and a second cooling plate with openings facing the bottom of the furnace body, and a third cooling plate with openings facing the top of the furnace body; holes for activated carbon to fall through the edges of the first and second cooling plates, and a gap for activated carbon to fall through the third cooling plate and the drive shaft; a collection plate inclined towards the discharge port is provided at the bottom of the cooling discharge section; activated carbon falls from the regenerated material plate into the first cooling plate, from the edge of the first cooling plate into the second cooling plate, from the middle of the second cooling plate into the third cooling plate, and from the edge of the third cooling plate into the collection plate, and is guided by the collection plate to the discharge port.

[0013] In one preferred embodiment, the outer wall of the furnace body in the cooling section is provided with a water-cooled jacket, through which circulating cooling water cools the furnace body; as another method, the cooling plate is provided with a cooling water channel, and the activated carbon indirectly exchanges heat with the cooling water when it moves on the cooling plate.

[0014] In a preferred embodiment, the furnace body is provided with an external steam channel in the regeneration section for introducing external steam; the top of the furnace body is provided with a feed inlet and the bottom is provided with a discharge outlet, which are offset from the center of the furnace body; an insulation layer is provided outside the furnace body between the preheating section and the regeneration section, and a pipe connecting the preheating section and the regeneration section is located inside the insulation layer. The pipe is equipped with a valve for introducing the high-temperature exhaust gas discharged from the regeneration section into the preheating section to form countercurrent heat exchange with the falling wet activated carbon; the furnace body is provided with an input port for connecting an external auxiliary heat source.

[0015] A regeneration process for a thermally recyclable activated carbon regeneration device includes the following steps: Step 1, Preheating and Dehydration: Wet activated carbon is continuously fed into the furnace from the top and falls layer by layer along preheating plate 1, preheating plate 2, and preheating plate 3 in the preheating and dehydration section. At the same time, the high-temperature exhaust gas generated in the regeneration section is introduced into the bottom of the preheating section through the pipe, forming a countercurrent heat exchange with the falling activated carbon, heating the activated carbon to 150 degrees Celsius, removing free water and reducing the moisture content to below 10%. The removed water vapor and volatile organic compounds are discharged from the top exhaust port and sent to the incineration or thermal oxidation device for treatment. Step 2, Electrothermal Regeneration: The preheated activated carbon continuously falls into the regeneration plate of the electrothermal regeneration section. A low-voltage, high-current is applied to the activated carbon pile through the bottom electrode contacts and the annular graphite electrode. Joule heat is generated by the resistance of the activated carbon itself, heating the activated carbon to 500 to 800 degrees Celsius. At the same time, superheated steam is introduced into the regeneration section through the external steam channel. The drive shaft drives the working arm to rotate and stir the activated carbon layer. The plug intermittently blocks the feed port as the working arm rotates, controlling the residence time of the activated carbon in the regeneration section, so that the adsorbate is desorbed and pyrolyzed, and the pores of the activated carbon reopen. Step 3, Cooling and Discharging: The regenerated high-temperature activated carbon falls from the feed port into the cooling and discharging section, and falls layer by layer along cooling plate 1, cooling plate 2, and cooling plate 3. Through indirect heat exchange via the water-cooled jacket on the outer wall of the furnace or the cooling water channels inside the cooling plates, the activated carbon is cooled to 40 to 80 degrees Celsius. The cooled activated carbon is continuously discharged from the bottom outlet. The entire cooling process keeps the system sealed.

[0016] In a preferred embodiment, when the system starts up, an auxiliary heat source is connected through an input port on the furnace body to assist in heating; after the system enters steady-state operation, the high-temperature exhaust gas generated in the regeneration section is continuously introduced into the preheating section through pipelines to achieve a self-sustaining heat cycle, and the external heat source can be disconnected or reduced.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention connects the preheating and regeneration sections via a pipe outside the furnace body. The high-temperature exhaust gas generated in the regeneration section is introduced to the bottom of the preheating section, where it forms a counter-current heat exchange with the falling wet activated carbon. The wet activated carbon is heated to approximately 150°C in the preheating section to remove free moisture before entering the regeneration section, thus avoiding energy loss caused by a large amount of moisture entering the high-temperature regeneration section. After the system starts, the external auxiliary heat source can be disconnected or reduced, relying on the residual heat of the exhaust gas in the regeneration section to maintain the temperature of the preheating section, achieving a self-sustaining heat cycle and effectively reducing overall energy consumption. 2. This invention uses an insulating and heat-resistant material to construct the main body of the recycled material holding plate. Multiple conductive electrode contacts are embedded in the bottom, and an annular graphite electrode is fixed to the inner wall. When energized, current is introduced from the bottom electrode contacts to the bottom of the activated carbon pile, and then conducted upwards through the activated carbon pile to the annular graphite electrode, forming a complete current loop. This design fully utilizes the conductivity and resistance characteristics of activated carbon itself, allowing heat to be generated directly between the activated carbon particles, which is an "internal heating" method. Combined with the stirring action of the rotating working arm, the fixed contact points between the particles are broken, causing the current path to continuously change, resulting in a uniform temperature distribution throughout the carbon layer and avoiding localized overheating or underheating. 3. This invention features multiple layers of conical plates with alternating opening directions in both the preheating and cooling sections. The activated carbon falls layer by layer in a zigzag path, extending its residence time in both sections and ensuring thorough preheating, dehydration, and uniform cooling. The cooling section, in conjunction with a water-cooling jacket and internal water channels in the cooling plates, achieves rapid and sealed cooling of the high-temperature activated carbon, effectively preventing oxidation and burn-off. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the furnace body of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the furnace body of the present invention.

[0021] Figure 4 This is a schematic diagram of the overall arrangement of the preheating plate, the recycling plate, and the cooling plate of the present invention.

[0022] Figure 5 This is a schematic diagram of the valve component in the closed state according to the present invention.

[0023] Figure 6 This is a schematic diagram of the valve component in the open state according to the present invention.

[0024] Figure 7 This is a schematic diagram of the valve component and sleeve structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the internal structure of the recycled material holding plate of the present invention.

[0026] Figure 9 This is a schematic diagram of the internal structure of the recycled material holding plate of the present invention.

[0027] Figure 10 This is a schematic diagram of the internal structure of the furnace body of the present invention.

[0028] The attached diagram is labeled as follows: 1. Furnace body; 2. Input port; 3. Feed inlet; 4. Drive shaft; 5. Preheating plate one; 501. Preheating plate two; 502. Preheating plate three; 503. Shelf; 504. Sleeve; 505. Valve component; 506. Edge; 507. Insulation layer; 508. Spring; 6. Recycled material holding plate; 601. Electrode column; 602. Working arm; 603. Base; 604. Discharge port; 605. Plug; 7. Cooling plate one; 701. Cooling plate two; 702. Cooling plate three; 703. Collection plate; 8. Discharge port. 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] As attached Figure 1 With appendix Figure 10 The activated carbon regeneration device shown includes a vertical furnace body 1, which stands upright on the ground via a bracket or legs. The upper and lower ends of the furnace body 1 are respectively provided with a material inlet 3 and an outlet 8, which are offset from the center of the furnace body 1.

[0031] Compared to existing activated carbon regeneration furnaces, the furnace body 1 of this invention can be roughly divided into a preheating section for initial heating of activated carbon, an electric heating section for regenerating activated carbon, and a final cooling section from top to bottom. A drive shaft 4 is arranged axially at the center of the furnace body 1, and the drive shaft 4 passes through the preheating section, the electric heating section, and the cooling section.

[0032] The preheating section preheats the activated carbon fed into the furnace. Its core function is to heat the newly entered activated carbon, which has a high moisture content, to remove the free water. This prevents a large amount of water from entering the high-temperature regeneration section, avoiding unnecessary energy loss and sudden temperature drops. The hot gas evaporates the free water inside the activated carbon particles and discharges it through the steam outlet at the top of the furnace body 1. The material temperature rises to about 150°C. The dried activated carbon (with a moisture content reduced to below 10%) continuously falls into the electrothermal regeneration section below.

[0033] Preheated dry activated carbon continuously falls into the regeneration cavity, external steam is introduced into the regeneration section, and at the same time, electricity (low voltage and high current) is applied between the electrode and the annular graphite electrode. The current passes through the activated carbon layer, and Joule heat is generated by the resistance of the activated carbon itself, raising the temperature to 500-800℃. Under the action of steam and electric heating, the adsorbate is desorbed and pyrolyzed, and the pores of the activated carbon reopen.

[0034] The regenerated high-temperature activated carbon (approximately 500-800℃) continuously falls into the cooling section below. The activated carbon moves slowly and continuously within the cooling section, and the temperature drops from 500-800℃ to 40-80℃. The cooled activated carbon is then continuously discharged through the discharge valve. Throughout the entire process, the system remains sealed to prevent air from entering.

[0035] Specifically, preheating plate 1 5, preheating plate 2 501, preheating plate 3 502 and shelf 503 are sequentially arranged on the top of the furnace body 1. The shelf 503 is made of insulating and heat-resistant material. The preheating plate is in the shape of a cone. Preheating plate 1 5 and preheating plate 3 502 are set with their openings facing the top of the furnace body 1 and are used to hold activated carbon. Preheating plate 2 501 is set with its opening facing the bottom of the furnace body 1.

[0036] The drive shaft 4 passes through the center of the preheating plate and the shelf 503. There is a gap between the preheating plate 1 5 and the preheating plate 3 502 and the drive shaft 4. This gap is used for the falling of activated carbon. Several holes are opened at equal angles at the edge of the preheating plate 2 501, which are also used for the falling of activated carbon.

[0037] The different orientations of the preheating plates are designed so that after the activated carbon is continuously fed from the top feed inlet 3 of the furnace body 1, the activated carbon first rolls down along the edge of the first preheating plate 5 and falls from the bottom of the first preheating plate 5 into the top of the second preheating plate 501. Then it rolls down from the top of the second preheating plate 501 to the edge and falls into the third preheating plate 502 through the holes, thus completing the preheating of the activated carbon to remove the free moisture.

[0038] To ensure the activated carbon is fully preheated in the preheating section, its descent from preheating plate 5 to preheating plate 2 501 is intermittent. Specifically, a sleeve 504 and a valve 505 are fitted onto the upper section of the drive shaft 4. The mating ends of the sleeve 504 and valve 505 are respectively formed with continuously formed crests and troughs, creating a wave-like shape when unfolded. The valve 505 is a frustum structure, with its bottom diameter larger than the bottom opening of preheating plate 5. A stepped end is also provided on the drive shaft 4, where a spring 508 is fitted. The valve 505 also has a stepped structure inside to limit the movement of the spring 508.

[0039] The valve component 505 can only move up and down on the drive shaft 4 through the key and keyway structure, and the sleeve 504 is fixedly assembled to the top of the furnace body 1 through the key and keyway structure.

[0040] During the rotation of the drive shaft 4, the drive shaft 4 drives the valve component 505 to rotate. Due to the crests and troughs at the joint end with the sleeve 504, the valve component 505 will move up and down continuously with the cooperation of the spring 508. Activated carbon falls from the gap between the valve component 505 and the preheating plate 5.

[0041] After preheating, activated carbon falls from the bottom of preheating plate 3502 into the regenerated material holding plate 6. The regenerated material holding plate 6 also adopts a conical material holding structure and is installed on the inner wall of the furnace body 1. The difference is that the top of the regenerated material holding plate 6 is extended with a cylindrical structure to increase the material storage capacity of the regenerated material holding plate 6.

[0042] A perimeter 506 is provided on the top of the shelf 503. The perimeter 506 is in the form of a frustum structure to ensure that activated carbon does not fall onto the shelf 503. At the same time, the shelf 503 can also prevent excessive heat from the regeneration section from being transferred to the preheating section.

[0043] Electrode posts 601 are installed at the bottom of the recycling plate 6, and the electrode posts 601 are coaxially arranged with the drive shaft 4. The main body of the recycling plate 6 is made of insulating and heat-resistant material, and multiple conductive electrode contacts (not shown in the figure) are embedded in its bottom. These contacts are connected to an external power supply through wires. A ring-shaped graphite electrode is attached and fixed to the inner wall surface of the recycling plate 6, and the activated carbon is in direct contact with the electrode; or the ring-shaped graphite electrode can be directly used as the inner wall of the recycling plate 6, forming direct conductive contact with the activated carbon. Multiple discharge ports 604 are opened at the bottom of the recycling plate 6, and the discharge ports 604 are opened at equal angles.

[0044] When energized, current flows from the bottom electrode contacts to the bottom of the activated carbon stack, and then upwards through the activated carbon stack to the annular graphite electrode, forming a complete current loop. Activated carbon itself is conductive. When a voltage is applied across the activated carbon stack, current flows through the contact points between the activated carbon particles. Due to the high resistance of these contact points, Joule heating is generated, causing the internal temperature of the activated carbon to rise rapidly.

[0045] A base 603 is also provided on the drive shaft 4, and multiple working arms 602 are provided on the circumferential surface of the base 603. The ends of the working arms 602 are bent and extend to the discharge port 604. A plug 605 structure is provided at the end of some of the working arms 602. The plug 605 structure fits the bottom structure of the regeneration material plate 6, and the rotation of the drive shaft 4 can drive the working arms 602 to rotate. The rotation of the working arms 602 can agitate the activated carbon. In order to ensure that the activated carbon can remain in the regeneration section for a longer time and be fully heated by the current, the plug 605 structure can intermittently block the discharge port 604 when the working arm 602 rotates, thereby controlling the time of the activated carbon in the regeneration section.

[0046] For electrothermal regeneration, stirring breaks the fixed contact points between activated carbon particles, and stirring causes the particles to rearrange continuously. The current path also changes continuously, and the temperature distribution of the entire carbon layer becomes more uniform. At the same time as stirring, an external steam channel is also set on the furnace body 1 in the regeneration section. External steam enters and plays an activation role in cleaning pores and expanding pore size. The working arm 602 is made of insulating materials (such as ceramics or metals with an insulating coating). During operation, external steam sources can also be introduced into the regeneration section through an interface.

[0047] After regeneration in the regeneration section, the activated carbon falls from the regeneration feeding plate 6 into the cooling section for cooling and then is discharged. The cooled regenerated activated carbon enters the finished product collection bin through the discharge port 8. After passing the inspection, it is packaged and stored or directly returned to the adsorption section for use. The cooling section is equipped with cooling plate 7, cooling plate 701, cooling plate 702 and collection plate 703 in sequence. The cooling plates and the preheating plates are designed as conical structures. The openings of cooling plate 7 and cooling plate 701 face the bottom of the furnace body 1, and holes are opened at their edges to allow activated carbon to fall. Cooling plate 701 faces the top of the furnace body 1 and has a gap between it and the drive shaft 4 to allow activated carbon to fall. The collection plate 703 is inclined towards the discharge port 8.

[0048] The workflow is as follows: activated carbon falls from the regeneration feeding plate 6 into the first cooling plate 7, from the edge of the first cooling plate 7 into the second cooling plate 701, from the middle of the second cooling plate 701 into the third cooling plate 702, and finally from the edge of the third cooling plate 702 into the collection plate 703. The inclined collection plate 703 will guide the activated carbon into the discharge port 8 for discharge.

[0049] The number of cooling plates can be increased or decreased according to actual process requirements, and is not limited to the three layers shown in this embodiment.

[0050] The cooling section employs a stepped cooling design, where the activated carbon exchanges heat sequentially with each cooling plate during its descent, resulting in a gradual temperature decrease. Specifically, cooling plate 71 cools the activated carbon from its regeneration temperature (500-800℃) to 300-400℃, cooling plate 701 further cools it to 150-250℃, and cooling plate 702 cools it to 40-80℃. The cooling range of each cooling plate can be adjusted according to actual process requirements and is not limited to the specific values ​​mentioned above.

[0051] The outer wall of the furnace body 1 in the cooling section is equipped with a water-cooled jacket, through which circulating cooling water indirectly cools the furnace body. Alternatively, each cooling plate can also have a cooling water flow channel inside, allowing the activated carbon to exchange heat indirectly with the cooling water as it moves on the cooling plate. Both cooling methods can be used individually or in combination.

[0052] An insulation layer 507 is installed outside the furnace body 1 between the preheating section and the regeneration section. The preheating section and the regeneration section are connected by a pipe inside the insulation layer 507. The pipe can be equipped with a valve (not shown in the figure) to introduce the high-temperature exhaust gas discharged from the regeneration section into the preheating section, forming a countercurrent heat exchange with the falling wet activated carbon. The insulation layer 507 can introduce the heat from the regeneration section into the preheating section for the utilization of the activated carbon. It should be noted that in the initial stage, the preheating section needs to be connected to an external heat source. An inlet 2 is provided in the furnace body 1 for connecting an external auxiliary heat source (such as an electric heater or burner). During continuous operation, the external heat source can be disconnected or reduced, and the heat from the regeneration section can be used to preheat the activated carbon.

[0053] The preheating and dehydration section is equipped with an exhaust port at the top, which is connected to the incineration / thermal oxidation unit via a pipeline. The exhaust gas containing water vapor and a small amount of volatile organic compounds discharged from the preheating section is sent to the incinerator (or the burner of the regeneration section) for high-temperature oxidation treatment by an induced draft fan. The organic matter is completely decomposed and then discharged in compliance with standards.

[0054] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermally recyclable activated carbon regeneration device, characterized in that, include: The furnace body (1) is divided into a preheating and dehydration section, an electric heating and regeneration section and a cooling and discharge section from top to bottom. The drive shaft (4) is set along the axis of the furnace body (1) and passes through the preheating and dehydration section, the electric heating regeneration section and the cooling and discharge section; The preheating and dehydration section is provided with a multi-layer preheating plate for extending the falling path of activated carbon, including a preheating plate one (5) and a preheating plate three (502) with openings facing the top of the furnace body (1), and a preheating plate two (501) with openings facing the bottom of the furnace body (1); the drive shaft (4) passes through the center of each preheating plate, and there is a gap between the preheating plate one (5) and the preheating plate three (502) and the drive shaft (4) for the activated carbon to fall, and holes for the activated carbon to fall are opened at the edge of the preheating plate two (501); The electrothermal regeneration section is provided with a regeneration holding plate (6). The main body of the regeneration holding plate (6) is made of insulating and heat-resistant material. Multiple conductive electrode contacts are embedded in its bottom. A ring graphite electrode is attached and fixed to the inner wall surface. Multiple discharge ports (604) are opened at the bottom. A base (603) is fixed on the drive shaft (4). Multiple working arms (602) are provided on the base (603). The working arms (602) are made of insulating material. Their ends are bent and extended to the discharge ports (604). Some working arms (602) have plugs (605) at their ends for intermittently blocking the discharge ports (604). The cooling discharge section is equipped with multiple cooling plates, and the outer wall of the furnace body (1) is equipped with a water-cooled jacket. The furnace body (1) is provided with a pipe connecting the preheating section and the regeneration section, and the top of the preheating and dehydration section is provided with a tail gas discharge port.

2. The activated carbon regeneration device with thermal circulation according to claim 1, characterized in that: The preheating and dehydration section also includes a valve assembly for controlling the intermittent falling of activated carbon. The valve assembly includes a sleeve (504) fitted onto the upper section of the drive shaft (4) and a valve component (505). The sleeve (504) is fixedly assembled to the top of the furnace body (1). The valve component (505) is slidably connected to the drive shaft (4) through a keyway structure and rotates synchronously with the drive shaft (4). The valve component (505) has a frustum structure, and its bottom diameter is larger than the diameter of the bottom opening of the preheating plate (5). The mating end of the sleeve (504) and the valve component (505) Each has a matching continuous wave-shaped peak and trough structure; the drive shaft (4) is also fitted with a spring (508), and the valve part (505) has a stepped structure inside for limiting the spring (508); when the drive shaft (4) rotates, it drives the valve part (505) to rotate. Since the sleeve (504) is fixed, the valve part (505) moves up and down continuously along the axial direction with the cooperation of the spring (508), controlling the gap between the valve part (505) and the bottom opening of the preheating plate (5), so as to realize the intermittent falling of activated carbon.

3. The activated carbon regeneration device with thermal circulation according to claim 2, characterized in that: A shelf (503) is provided between the preheating dehydration section and the electrothermal regeneration section. The shelf (503) is made of insulating and heat-resistant material. The top of the shelf (503) is provided with a rim (506), which is in the shape of a frustum to prevent activated carbon from falling onto the shelf (503).

4. The activated carbon regeneration device with thermal circulation according to claim 3, characterized in that: The recycled material holding plate (6) adopts a conical material holding structure, with a cylindrical structure extending from the top to increase the material storage capacity; the discharge port (604) at the bottom of the recycled material holding plate (6) is opened at an equal angle; the annular graphite electrode is attached and fixed to the inner wall surface of the recycled material holding plate (6), and the activated carbon is in direct contact with the electrode; or the annular graphite electrode is directly used as the inner wall of the recycled material holding plate (6), forming a direct conductive contact with the activated carbon; when energized, the current is introduced from the bottom electrode contact to the bottom of the activated carbon pile, and then conducted from bottom to top through the activated carbon pile to the annular graphite electrode, forming a complete current loop.

5. The activated carbon regeneration device with thermal circulation according to claim 4, characterized in that: The working arm (602) is made of ceramic or metal material with an insulating coating. When the working arm (602) rotates, it can agitate the activated carbon, break the fixed contact points between the activated carbon particles, and cause the particles to rearrange continuously, and the current path changes accordingly. The plug (605) intermittently blocks the feed port (604) as the working arm (602) rotates, controlling the residence time of the activated carbon in the regeneration section.

6. The activated carbon regeneration device with thermal circulation according to claim 5, characterized in that: The multi-layer cooling plates in the cooling discharge section include a first cooling plate (7) and a second cooling plate (701) with openings facing the bottom of the furnace body (1), and a third cooling plate (702) with openings facing the top of the furnace body (1). Holes for activated carbon to fall are provided at the edges of the first cooling plate (7) and the second cooling plate (701), and a gap for activated carbon to fall is provided between the third cooling plate (702) and the drive shaft (4). A collection plate (703) inclined towards the discharge port (8) is provided at the bottom of the cooling discharge section. Activated carbon falls from the regenerated material plate (6) into the first cooling plate (7), from the edge of the first cooling plate (7) into the second cooling plate (701), from the middle of the second cooling plate (701) into the third cooling plate (702), and from the edge of the third cooling plate (702) into the collection plate (703), and is guided by the collection plate (703) to the discharge port (8).

7. A thermally recyclable activated carbon regeneration device according to claim 1 or 6, characterized in that: The outer wall of the furnace body (1) in the cooling section is provided with a water-cooled jacket, and the circulating cooling water cools the furnace body through the jacket; as another method, the cooling plate is provided with a cooling water flow channel, and the activated carbon exchanges heat indirectly with the cooling water when it moves on the cooling plate.

8. The activated carbon regeneration device with thermal circulation according to claim 7, characterized in that: The furnace body (1) is provided with an external steam channel in the regeneration section for introducing external steam; the furnace body (1) is provided with a feed inlet (3) at the top and a discharge outlet (8) at the bottom, with the feed inlet (3) and discharge outlet (8) offset from the center of the furnace body (1); the furnace body (1) is provided with an insulation layer (507) between the preheating section and the regeneration section, and the pipe connecting the preheating section and the regeneration section is located inside the insulation layer (507). The pipe is provided with a valve for introducing the high-temperature exhaust gas discharged from the regeneration section into the preheating section to form countercurrent heat exchange with the falling wet activated carbon; the furnace body (1) is provided with an input port (2) for connecting an external auxiliary heat source.

9. A regeneration process based on the thermally cyclic activated carbon regeneration device according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1, Preheating and Dehydration: Wet activated carbon is continuously fed from the top of the furnace body (1) and falls layer by layer along the preheating plate 1 (5), preheating plate 2 (501), and preheating plate 3 (502) in the preheating and dehydration section. At the same time, the high-temperature tail gas generated in the regeneration section is introduced into the bottom of the preheating section through the pipeline, forming countercurrent heat exchange with the falling activated carbon, heating the activated carbon to 150°C, removing free water and reducing the water content to below 10%. The removed water vapor and volatile organic compounds are discharged from the top tail gas outlet and sent to the incineration / thermal oxidation device for treatment. Step 2, electrothermal regeneration: The preheated activated carbon continuously falls into the regeneration plate (6) of the electrothermal regeneration section. Low-pressure high current is applied to the activated carbon pile through the bottom electrode contacts and the ring graphite electrode. Joule heat is generated by the resistance of the activated carbon itself to heat the activated carbon to 500-800℃. At the same time, superheated steam is introduced into the regeneration section through the external steam channel. The drive shaft (4) drives the working arm (602) to rotate and stir the activated carbon layer. The plug (605) rotates with the working arm (602) to intermittently block the feed port (604) to control the residence time of the activated carbon in the regeneration section, so that the adsorbate is desorbed and pyrolyzed, and the pores of the activated carbon are reopened. Step 3, Cooling and Discharging: The regenerated high-temperature activated carbon falls from the feed port (604) into the cooling and discharging section, and falls layer by layer along the first cooling plate (7), the second cooling plate (701), and the third cooling plate (702). Through indirect heat exchange via the water-cooled jacket on the outer wall of the furnace body and / or the cooling water flow channel inside the cooling plate, the activated carbon is cooled to 40-80℃. The cooled activated carbon is continuously discharged from the bottom outlet (8). The entire cooling process keeps the system sealed.

10. The regeneration process according to claim 9, characterized in that: When the system starts, it connects to an auxiliary heat source for auxiliary heating through the input port (2) set on the furnace body (1); After the system enters steady-state operation, the high-temperature exhaust gas generated in the regeneration section is continuously introduced into the preheating section through pipelines to achieve a self-sustaining heat cycle, and the external heat source can be disconnected or reduced.

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