Active carbon regeneration system and method based on hydrothermal technology

Abstract

The invention belongs to the technical field of efficient energy utilization, and relates to an activated carbon regeneration system and method based on a hydrothermal technology. According to the invention, the polluted activated carbon is regenerated by using the regeneration device, so that the repeated utilization of the activated carbon is realized, the resource waste is effectively avoided, the environmental pollution is reduced, the resource utilization of byproducts is realized, and the environmental pollution is reduced; secondly, high-temperature cooling water in the condenser flows back to the water supply equipment, heat recycling is achieved, and energy loss is further reduced; meanwhile, energy consumption required for maintaining heat balance can be reduced and even the heat balance in the process can be maintained through heat released by the oxygenolysis reaction in the regeneration device, so that the self-heating reaction is realized; in addition, the regeneration process of the supercritical water on the activated carbon can be observed in real time, and the method has important guiding significance for judging whether the supercritical water is suitable for oxidizing required pollutants or not.

Description

Technical Field

[0001] The invention belongs to the technical field of efficient energy utilization and relates to an activated carbon regeneration system and method based on hydrothermal technology. Background Art

[0002] Activated carbon has the characteristics of good pore structure, large specific surface area, stable properties and large adsorption capacity. It is widely used in the treatment of toxic and harmful gases and sewage in the food, chemical, metallurgical and pharmaceutical industries. In the process of adsorbing impurities, pollutants continue to accumulate on the surface of activated carbon, causing the adsorption capacity of activated carbon to gradually decrease and eventually reach saturation. Whether these waste activated carbons are landfilled or incinerated, it is neither economical nor environmentally friendly, and the pollutants adsorbed by them are also prone to cause secondary pollution.

[0003] At present, the treatment methods of saturated activated carbon include incineration, landfill and regeneration. The first two methods will not only cause the resources to be underutilized, but also cause secondary pollution problems. Therefore, the research on the desorption, regeneration and harmless treatment of saturated activated carbon is of great significance to environmental protection, economic benefits and resource utilization. Activated carbon regeneration refers to the removal of adsorbents adsorbed on activated carbon without destroying the original structure of activated carbon, restoring its adsorption performance, so as to achieve the purpose of reuse. It has strong economic and environmental benefits and is an environmentally friendly activated carbon treatment method. Existing activated carbon regeneration technologies mainly include thermal regeneration, chemical regeneration, and biological regeneration. Thermal regeneration is the most widely used and most mature activated carbon regeneration method in industry. Although this method has the characteristics of high regeneration efficiency and wide application range, it requires external energy for heating during the regeneration process, and the investment and operating costs are high. The activated carbon itself has a large heat loss. When the heating temperature is too high, it is easy to spontaneously combust; chemical regeneration uses chemical reagents to remove adsorbents. It is easy to operate and has high recovery efficiency, but this technology is prone to secondary pollution, and the cost of added solvents is also high. It is not an environmentally friendly method; biological regeneration is to use domesticated bacteria to analyze organic matter adsorbed on activated carbon. Although this method is simple and easy, with low investment and operating costs, the regeneration process takes a long time and is greatly affected by water quality and temperature. In addition, since most of the adsorbents are adsorbed in the micropores, and the microorganisms are too large to enter the activated carbon micropores, there is a problem of incomplete degradation of organic matter. In addition, the activated carbon in this technology is also difficult to regenerate in situ, so the actual application range is limited.

[0004] Supercritical fluid regeneration technology is an emerging saturated activated carbon regeneration technology. Supercritical fluid refers to a fluid whose temperature and pressure are higher than its corresponding critical temperature and critical pressure. Its state is between gas and liquid, and it has the dual characteristics of gas and liquid. Supercritical fluid has some special properties. The dielectric constant of water decreases with the increase of reaction temperature and pressure. When the temperature and pressure exceed the critical point, water exhibits non-polar characteristics. At this time, according to the principle of like dissolves like, water can be miscible with organic matter. The completion of homogeneous reaction in water environment greatly reduces the mass transfer resistance between substances. The special properties of supercritical fluid and its technical principles determine its possibility of being used to regenerate activated carbon.

[0005] The main principle of supercritical water oxidation is to use supercritical water as a reaction medium to oxidize and decompose organic matter. The process is similar to wet oxidation. The biggest difference between supercritical water oxidation and wet oxidation is that the former oxidizes and decomposes organic matter at a higher temperature and higher pressure that exceeds the critical point of water. The characteristics of supercritical water make organic matter, oxidant, and water form a uniform phase, overcome the material transmission resistance between phases, and transform the multiphase reaction that originally occurred between liquid or solid organic matter and gas phase oxygen into a single phase. Since high temperature and high pressure greatly increase the oxidation rate of organic matter, it is possible to achieve an extremely high destruction rate of organic components within seconds, and the reaction is thorough and complete.

[0006] Since the process of supercritical water oxidation of pollutants is difficult to observe, the oxidation effect cannot be effectively evaluated. Therefore, there is an urgent need for a device that consumes less energy and can observe the process of supercritical water regeneration of saturated activated carbon, so as to reduce the cost of use and effectively judge the oxidation effect of supercritical water on adsorbed pollutants. Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art and provide an activated carbon regeneration system and method based on hydrothermal technology. The present invention can realize the reuse of activated carbon, avoid waste of resources, and reduce environmental pollution; at the same time, the regeneration process of activated carbon by supercritical water can be observed in real time.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an activated carbon regeneration system based on hydrothermal technology, comprising a raw material tank, a material pump and a regeneration device; the raw material tank is connected to the material pump; the regeneration device is provided with a first inlet, a first outlet, a water inlet, an oxidant inlet, a second inlet and a second outlet; the material pump is connected to the regeneration device through the first inlet; the regeneration device is connected to an activated carbon separation device through the first outlet; the activated carbon separation device is connected to an activated carbon collector; the activated carbon separation device is connected to the regeneration device through the second inlet; the regeneration device is connected to a condenser through the second outlet; the condenser is respectively connected to a cooling water tank, a water supply device and a separator; the separator is respectively connected to a carbon dioxide storage tank and a water storage tank; the regeneration device is connected to the water supply device through the water inlet; the regeneration device is connected to an oxidant storage tank through the oxidant inlet.

[0009] Preferably, a back pressure valve is provided between the condenser and the separator.

[0010] Preferably, the regeneration device is a visual regeneration device; the activated carbon regeneration system further comprises a camera device and a processor connected thereto; the camera device is arranged on the side of the regeneration device.

[0011] Preferably, a thermocouple is arranged inside the regeneration device; heating tapes are arranged at intervals on the surface of the regeneration device; both the thermocouple and the heating tapes are electrically connected to a temperature controller.

[0012] Preferably, the activated carbon separation device is provided with a third inlet, a third outlet and an activated carbon outlet; the third inlet is connected to the first outlet; the third outlet is connected to the second inlet; the activated carbon outlet is connected to the activated carbon collector.

[0013] Preferably, the condenser is provided with a fourth inlet, a fourth outlet, a cooling water inlet and a cooling water outlet; the fourth inlet is connected to the second outlet; the fourth outlet is connected to the separator; the cooling water inlet is connected to the cooling water tank; the cooling water outlet is connected to the water supply device.

[0014] Preferably, the separator is provided with a fifth inlet, a carbon dioxide outlet and a water outlet; the fifth inlet is connected to the fourth outlet; the carbon dioxide outlet is connected to the carbon dioxide storage tank; the water outlet is connected to the water storage tank.

[0015] Preferably, a control valve is provided between the water outlet and the water storage tank.

[0016] Preferably, a pressure gauge, instrument air and a liquid level controller are arranged inside the separator; a pressure relief valve is arranged on the separator; the liquid level controller is connected to the control valve.

[0017] In a second aspect, the present invention provides a method for regenerating activated carbon based on hydrothermal technology, comprising the following steps: The contaminated activated carbon in the raw material tank is pumped to the regeneration device through the material pump, and is converted by the regeneration device to form a pollutant-activated carbon mixture; the pollutant-activated carbon mixture enters the activated carbon separation device for separation, and the pollutants and regenerated activated carbon are obtained after separation. The regenerated activated carbon is stored in the activated carbon collector, and the pollutants are returned to the regeneration device and are oxidized and decomposed to form a carbon dioxide-water mixture; the carbon dioxide-water mixture is cooled by the condenser and then enters the separator for separation, and carbon dioxide and water are obtained after separation, and the carbon dioxide is stored in the carbon dioxide storage tank, and the water is stored in the water storage tank.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes a regeneration device to regenerate contaminated activated carbon, thereby realizing the reuse of activated carbon, effectively avoiding waste of resources, and reducing environmental pollution; the mixture after the reaction is separated by a separator, liquid water is collected in a water storage tank, and carbon dioxide gas is stored in a carbon dioxide storage tank, thereby avoiding pollution to the environment caused by direct discharge, realizing resource utilization of by-products, and reducing pollution to the environment; secondly, the high-temperature cooling water in the condenser is refluxed to the water supply equipment, thereby realizing heat recovery and utilization, and further reducing energy loss; at the same time, the heat released by the oxidative decomposition reaction in the regeneration device can reduce the energy consumption required to maintain thermal balance and even maintain the thermal balance of the process, thereby realizing self-heating reaction.

[0019] Furthermore, the regeneration device adopts a visual regeneration device to realize the visualization of the oxidation regeneration process. It can observe the regeneration process of activated carbon by supercritical water in real time, and can evaluate the catalytic oxidation ability of supercritical water on pollutants. It has important guiding significance for judging whether supercritical water is suitable for oxidizing the required pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic structural diagram of an activated carbon regeneration system based on hydrothermal technology of the present invention; Figure 2 It is a schematic diagram of the internal structure of the regeneration device of the present invention; Figure 3 It is a schematic diagram of the tube sandwich structure and flow direction of the regeneration device of the present invention; Figure 4 It is a structural schematic diagram of the activated carbon separation device of the present invention; Figure 5 It is a structural schematic diagram of a condenser of the present invention; Figure 6 It is a schematic structural diagram of the separator of the present invention.

[0022] Among them: 1. Raw material tank; 2. Material pump; 3. Regeneration device; 4. Cooling water tank; 5. Condenser; 6. Back pressure valve; 7. Carbon dioxide storage tank; 8. Processor; 9. Water supply equipment; 10. Camera device; 11. Activated carbon separation device; 12. Activated carbon collector; 13. Separator; 14. Water storage tank; 15. Oxidant storage tank; 16. First inlet; 17. First outlet; 18. Temperature controller; 19. Thermocouple; 20. Heating belt; 21. Water inlet inlet; 22, oxidant inlet; 23, second inlet; 24, second outlet; 25, third inlet; 26, third outlet; 27, activated carbon outlet; 28, cooling water inlet; 29, cooling water outlet; 30, fourth inlet; 31, fourth outlet; 32, carbon dioxide outlet; 33, defoaming net; 34, safety head; 35, pressure gauge; 36, instrument air; 37, liquid level controller; 38, control valve; 39, water outlet; 40, pressure relief valve; 41, fifth inlet. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings: The first object of the present invention is to provide an activated carbon regeneration system based on hydrothermal technology, such as Figure 1 As shown, it includes a raw material tank 1, a material pump 2 and a regeneration device 3; the raw material tank 1 and the material pump 2 are connected; Figure 2 As shown, the regeneration device 3 is provided with a first inlet 16, a first outlet 17, a water inlet 21, an oxidant inlet 22, a second inlet 23 and a second outlet 24; the material pump 2 is connected to the regeneration device 3 through the first inlet 16; the regeneration device 3 is connected to the activated carbon separation device 11 through the first outlet 17; the activated carbon separation device 11 is connected to the activated carbon collector 12; the activated carbon separation device 11 is connected to the regeneration device 3 through the second inlet 23; the regeneration device 3 is connected to the condenser 5 through the second outlet 24; the condenser 5 is respectively connected to the cooling water tank 4, the water supply equipment 9 and the separator 13; the separator 13 is respectively connected to the carbon dioxide storage tank 7 and the water storage tank 14; the regeneration device 3 is connected to the water supply equipment 9 through the water inlet 21; the regeneration device 3 is connected to the oxidant storage tank 15 through the oxidant inlet 22.

[0030] The present invention stores contaminated activated carbon raw materials through a raw material tank 1; the contaminated activated carbon is transported from the raw material tank 1 to the regeneration device 3 through a material pump 2. Through the pressure balance method, the material pump 2 ensures that the activated carbon addition process is carried out online, avoiding system interruption and improving the efficiency of continuous operation. The activated carbon regeneration process is carried out through the regeneration device 3, and the regenerated activated carbon is transported to the activated carbon separation device 11. Specifically, the regeneration device 3 receives water from the water supply device 9 through the water inlet 21, receives an oxidant from the oxidant storage tank 15 through the oxidant inlet 22 for oxidative decomposition of pollutants, receives pollutants from the activated carbon separation device 11 through the second inlet 23, and the pollutants after oxidation and decomposition form a carbon dioxide-water mixture, which is transported to the condenser 5 through the second outlet 24.

[0031] The present invention collects and stores regenerated activated carbon through an activated carbon collector 12, and a cooling water tank 4 provides cooling water for a condenser 5. The carbon dioxide-water mixture discharged from the regeneration device 3 is cooled through the condenser 5 to facilitate subsequent separation and treatment; the condensed carbon dioxide-water mixture is separated through a separator 13; the separated carbon dioxide gas is then stored through a carbon dioxide storage tank 7, and the separated water is stored in a water storage tank 14.

[0032] The present invention utilizes supercritical water catalytic oxidation technology to regenerate contaminated activated carbon, realizes the reuse of activated carbon, effectively avoids waste of resources, and reduces environmental pollution. The mixture after the reaction is separated by a separator 13, liquid water is collected in a water storage tank 14, and carbon dioxide gas is stored in a carbon dioxide storage tank, thereby avoiding pollution to the environment caused by direct discharge, realizing resource utilization of by-products, and reducing pollution to the environment. Secondly, the high-temperature cooling water in the condenser 5 flows back to the water supply equipment 9, realizing heat recovery and further reducing energy loss. At the same time, the present invention utilizes the heat released by the oxidative decomposition reaction in the regeneration device 3 to reduce the energy consumption required to maintain thermal balance and even maintain the thermal balance of the process, thereby realizing self-heating reaction.

[0033] Exemplarily, the carbon dioxide is filtered before flowing into the carbon dioxide storage tank 7 .

[0034] A back pressure valve 6 is provided between the condenser 5 and the separator 13 , and the back pressure valve 6 is used to regulate and stabilize the pressure in the regeneration device 3 .

[0035] The regeneration device 3 is a visual regeneration device, and the material is transparent; the activated carbon regeneration system also includes a camera 10 and a processor 8 connected thereto; the camera 10 is arranged on the side of the regeneration device 3. The process of supercritical water oxidation regeneration of the contaminated saturated activated carbon is photographed by the camera 10, and the photographed image is transmitted to the processor 8 in real time, realizing the visualization of the oxidation regeneration process, and the oxidation ability of supercritical water on pollutants can be evaluated, which has important guiding significance for judging whether supercritical water is suitable for oxidizing the required pollutants.

[0036] The regeneration device 3 is provided with a thermocouple 19 inside; the surface of the regeneration device 3 is provided with heating belts 20 at intervals, both of which are used to supplement the residual heat required to maintain the supercritical state.

[0037] like Figure 3 As shown, the regeneration device 3 adopts a sandwich structure, including an inner tube and an outer tube, the outer tube stores supercritical water and contaminated activated carbon, and the inner tube stores pollutants and oxidants; the temperature of the regeneration device 3 is increased by a heating belt 20 wrapped around the outside of the regeneration device 3, so that the temperature of the regeneration device 3 reaches the required temperature of supercritical water and then is kept warm, and the supercritical water in the outer tube causes the pollutants on the surface of the activated carbon to separate from the activated carbon, thereby realizing the regeneration of the activated carbon.

[0038] The thermocouple 19 and the heating belt 20 are both electrically connected to the temperature controller 18. When the temperature of the regeneration device 3 reaches the set temperature of the temperature controller 18, the temperature controller 18 controls the heating belt 20 to enter the insulation mode and adjusts the thermocouple 19 to maintain the temperature of the regeneration device 3 stable.

[0039] like Figure 4 As shown, the activated carbon separation device 11 is provided with a third inlet 25, a third outlet 26 and an activated carbon outlet 27; the third inlet 25 is connected to the first outlet 17; the third outlet 26 is connected to the second inlet 23; and the activated carbon outlet 27 is connected to the activated carbon collector 12.

[0040] like Figure 5 As shown, the condenser 5 is provided with a fourth inlet 30, a fourth outlet 31, a cooling water inlet 28 and a cooling water outlet 29; the fourth inlet 30 is connected to the second outlet 24; the fourth outlet 31 is connected to the separator 13; the cooling water inlet 28 is connected to the cooling water tank 4; the cooling water outlet 29 is connected to the water supply equipment 9 to recycle the working fluid heat.

[0041] like Figure 6 As shown, the separator 13 is provided with a fifth inlet 41 , a carbon dioxide outlet 32 ​​and a water outlet 39 ; the fifth inlet 41 is connected to the fourth outlet 31 ; the carbon dioxide outlet 32 ​​is connected to the carbon dioxide storage tank 7 ; and the water outlet 39 is connected to the water storage tank 14 .

[0042] A control valve 38 is provided between the water outlet 39 and the water storage tank 14. The control valve 38 can accurately adjust the water flow from the water outlet 39 to the water storage tank 14, thereby ensuring the reasonable allocation and utilization of water resources and avoiding waste of water resources.

[0043] The separator 13 is provided with a pressure gauge 35, an instrument air 36 and a liquid level controller 37; the separator 13 is provided with a pressure relief valve 40; the liquid level controller 37 is connected to the control valve 38. The pressure gauge 35 is used to monitor the pressure state inside the separator 13 and understand the working condition of the separator 13. The liquid level controller 37 is used to read the liquid level in the separator 13 and control the opening of the control valve 38 to stabilize the liquid level. The instrument air 36 is used to provide ventilation inside the separator 13 to ensure the pressure inside the separator 13. The pressure relief valve 40 is used to protect the pressure of the separator 13 within the set pressure range to prevent accidents.

[0044] Exemplarily, a safety head 34 is installed on the separator 13 to protect the safety of the separator 13 .

[0045] Exemplarily, a defoaming net 33 is disposed inside the separator 13 to separate droplets of the carbon dioxide-water mixture.

[0046] The second object of the present invention is to provide a method for regenerating activated carbon based on hydrothermal technology, comprising the following steps: The contaminated activated carbon in the raw material tank 1 is pumped to the regeneration device 3 by the material pump 2, and is converted by the regeneration device 3 to form a pollutant-activated carbon mixture; the pollutant-activated carbon mixture enters the activated carbon separation device 11 for separation, and the pollutants and regenerated activated carbon are obtained after separation. The regenerated activated carbon is stored in the activated carbon collector 12, and the pollutants are returned to the inner tube of the regeneration device 3, mixed with the oxidant for oxidative decomposition to form a carbon dioxide-water mixture, and finally the activated carbon is regenerated; the carbon dioxide-water mixture is cooled by the condenser 5 and enters the separator 13 for separation, and carbon dioxide and water are obtained after separation, and the carbon dioxide is stored in the carbon dioxide storage tank 7, and the water is stored in the water storage tank 14.

[0047] The specific process of the polluted activated carbon being transformed by the regeneration device 3 to form a pollutant-activated carbon mixture is as follows: the heating belt 20 wrapped outside the regeneration device 3 is heated up so that the temperature of the regeneration device 3 reaches the temperature required by the supercritical water and then is kept warm. In the outer tube, the supercritical water causes the pollutants on the surface of the activated carbon to separate from the activated carbon. During the rising process of the mixture, the bubbles have a stirring effect on the activated carbon, and the activated carbon particles are affected by the combined effects of gravity, bubble entrainment and rising liquid flow, pulsating up and down within a certain range and mixing, completing the transformation of the pollutants to form a pollutant-activated carbon mixture.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An activated carbon regeneration system based on hydrothermal technology, characterized in that: The invention comprises a raw material tank (1), a material pump (2) and a regeneration device (3); the raw material tank (1) is connected to the material pump (2); the regeneration device (3) is provided with a first inlet (16), a first outlet (17), a water inlet (21), an oxidant inlet (22), a second inlet (23) and a second outlet (24); the material pump (2) is connected to the regeneration device (3) via the first inlet (16); the regeneration device (3) is connected to the activated carbon separation device (11) via the first outlet (17); the activated carbon separation device (11) is connected to the activated carbon collector (12); The activated carbon separation device (11) is connected to the regeneration device (3) via a second inlet (23); the regeneration device (3) is connected to the condenser (5) via a second outlet (24); the condenser (5) is respectively connected to the cooling water tank (4), the water supply device (9) and the separator (13); the separator (13) is respectively connected to the carbon dioxide storage tank (7) and the water storage tank (14); the regeneration device (3) is connected to the water supply device (9) via a water inlet (21); and the regeneration device (3) is connected to the oxidant storage tank (15) via an oxidant inlet (22).

2. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: A back pressure valve (6) is provided between the condenser (5) and the separator (13).

3. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: The regeneration device (3) is a visual regeneration device; the activated carbon regeneration system further comprises a camera device (10) and a processor (8) connected thereto; the camera device (10) is arranged on a side of the regeneration device (3).

4. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: A thermocouple (19) is arranged inside the regeneration device (3); a heating belt (20) is arranged at intervals on the surface of the regeneration device (3); and both the thermocouple (19) and the heating belt (20) are electrically connected to a temperature controller (18).

5. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: The activated carbon separation device (11) is provided with a third inlet (25), a third outlet (26) and an activated carbon outlet (27); the third inlet (25) is connected to the first outlet (17); the third outlet (26) is connected to the second inlet (23); and the activated carbon outlet (27) is connected to the activated carbon collector (12).

6. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: The condenser (5) is provided with a fourth inlet (30), a fourth outlet (31), a cooling water inlet (28) and a cooling water outlet (29); the fourth inlet (30) is connected to the second outlet (24); the fourth outlet (31) is connected to the separator (13); the cooling water inlet (28) is connected to the cooling water tank (4); and the cooling water outlet (29) is connected to the water supply device (9).

7. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: The separator (13) is provided with a fifth inlet (41), a carbon dioxide outlet (32) and a water outlet (39); the fifth inlet (41) is connected to the fourth outlet (31); the carbon dioxide outlet (32) is connected to a carbon dioxide storage tank (7); and the water outlet (39) is connected to a water storage tank (14).

8. The activated carbon regeneration system based on hydrothermal technology according to claim 1 is characterized in that: A control valve (38) is provided between the water outlet (39) and the water storage tank (14).

9. The activated carbon regeneration system based on hydrothermal technology according to claim 8, characterized in that: The separator (13) is provided with a pressure gauge (35), instrument air (36) and a liquid level controller (37) inside; a pressure relief valve (40) is provided on the separator (13); and the liquid level controller (37) is connected to a control valve (38).

10. An activated carbon regeneration method based on hydrothermal technology, characterized in that: The activated carbon regeneration system based on hydrothermal technology according to any one of claims 1 to 9 comprises the following steps: The contaminated activated carbon in the raw material tank (1) is pumped to the regeneration device (3) through the material pump (2), and is converted by the regeneration device (3) to form a pollutant-activated carbon mixture; the pollutant-activated carbon mixture enters the activated carbon separation device (11) for separation, and the pollutant and regenerated activated carbon are obtained after separation. The regenerated activated carbon is stored in the activated carbon collector (12), and the pollutant is returned to the regeneration device (3) and is oxidized and decomposed to form a carbon dioxide-water mixture; the carbon dioxide-water mixture is cooled by the condenser (5) and enters the separator (13) for separation, and carbon dioxide and water are obtained after separation. The carbon dioxide is stored in the carbon dioxide storage tank (7), and the water is stored in the water storage tank (14).

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