Low-ignition-loss-rate combustion partition type regenerated activated carbon rotary kiln equipment and process thereof

Abstract

The invention discloses low-ignition-loss-rate combustion partition type regenerated activated carbon rotary kiln equipment and a process thereof. The equipment comprises an airtight feeding mechanism, a rotary kiln body, an exhaust emission groove, a partition combustion chamber, a combustion partition plate, a cooling chamber and a rotary driving mechanism. The combustion partition plate is arranged in the partition combustion chamber and divides the interior of the partition combustion chamber into an activation cavity and a combustion cavity, the activation cavity is arranged close to the rotary kiln body, and an interval space is arranged between the top of the combustion partition plate and the inner wall of the top of the partition combustion chamber so that smoke in the combustion cavity can enter the activation cavity through the interval space. Aiming at the problems of high ignition loss rate and difficulty in stable control of the atmosphere in the kiln in the regeneration process of the inactivated activated carbon, the independent combustion cavity is adopted for sufficient combustion, flame is limited in the combustion cavity, and only high-temperature flue gas after combustion is introduced into the kiln body of the rotary kiln to heat a carbon layer. The high heat transfer efficiency of direct heating is reserved, meanwhile, local overheating and oxygen-enriched burning are restrained, and the ignition loss rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waste activated carbon thermal regeneration, and particularly relates to a combustion partition type regenerated activated carbon rotary kiln equipment with low loss on ignition and a process thereof. BACKGROUND

[0002] Activated carbon has high specific surface area and abundant microporous structure, and is widely used in VOCs treatment, industrial tail gas purification, water treatment and solvent recovery, etc., and is a commonly used end adsorption material. After a period of use, the pores of activated carbon are blocked by organic matter, coke-like deposits and inorganic impurities, and the adsorption performance is significantly reduced, forming "deactivated" activated carbon. Deactivated activated carbon is usually identified as hazardous waste, which needs to be incinerated or landfilled at a high cost. In order to reduce the amount of new carbon procurement and the pressure of hazardous waste disposal, the route of regeneration and reuse is gradually adopted in industry.

[0003] The current mainstream regeneration method in engineering is thermal regeneration process of activated carbon, that is, the adsorbents are volatilized, cracked and discharged in stages under controlled atmosphere, and water vapor or CO2 and other activation gases are introduced at high temperature to restore the microporous structure and adsorption capacity. The process generally includes three stages of drying, pyrolysis and activation, and the highest temperature can reach 800°C or above. The adsorption performance of regenerated activated carbon can be restored to 60% to 90% of the original level, which can greatly reduce the amount of hazardous waste and has mature industrial implementability.

[0004] In industrial equipment, continuous rotary kiln is widely used for regeneration and activation treatment of waste activated carbon due to its continuous feeding and discharging, low land occupation and investment. In the existing waste activated carbon rotary kiln regeneration process, there are two common heating methods, direct heating and indirect heating. Direct heating usually introduces combustion flame or high-temperature flue gas directly into the rotary kiln cylinder, so that the material is directly contacted with high-temperature flue gas to complete drying, pyrolysis and activation. This method has high heat transfer efficiency, fast heating speed and relatively simple equipment structure, and is suitable for continuous regeneration conditions with large processing capacity; but it is easy to cause local overheating and oxidation of activated carbon, even burning, resulting in increased loss on ignition and decreased strength of finished product; and the temperature and atmosphere in the kiln are difficult to control in different zones, and direct flame or high-temperature flue gas flushing can cause local hot spots, resulting in pore structure collapse, specific surface area reduction and uneven regeneration. The indirect heating method introduces heat into the material area of the rotary kiln through external combustion chamber or sleeve / jacket type heating structure in the form of conduction and radiation, and the process atmosphere in contact with activated carbon in the kiln is basically oxygen-free or strictly controlled, which can significantly inhibit the oxidation and loss of carbon skeleton, thereby reducing the loss on ignition and increasing the regeneration yield, but the heat transfer path is longer, the unit heat transfer flux is lower, and higher external wall temperature, longer residence time or larger equipment size are needed to achieve the same regeneration degree, which increases the equipment cost and energy consumption.

[0005] In summary, although direct heating has high heat transfer efficiency and compact structure, it is easy to introduce oxygen and cause local overheating, leading to over-burning of activated carbon, high ignition loss and high tail gas treatment pressure; indirect heating is conducive to maintaining a low-oxygen or oxygen-free atmosphere in the regeneration section, thereby reducing the ignition loss and improving product consistency, but its heat transfer efficiency is lower, the equipment structure is complex, and the scale-up cost is high. Therefore, a technical solution suitable for continuous regeneration conditions of a rotary kiln is urgently needed, which can realize zoned temperature control, limit oxygen from entering the activation section, reduce the ignition loss of activated carbon, and at the same time consider the heat transfer efficiency and device scale-up cost, thereby improving the regeneration yield, prolonging the service life of activated carbon and reducing the comprehensive treatment cost. SUMMARY

[0006] The present application provides a low-ignition-loss combustion-isolation type activated carbon rotary kiln equipment and process to optimize the uneven heat distribution and high ignition loss of activated carbon in traditional direct heating type rotary kilns.

[0007] The specific technical solutions adopted by the present application are as follows: A low-ignition-loss combustion-isolation type activated carbon rotary kiln equipment, comprising a rotary kiln body, a waste gas discharge tank, a combustion isolation chamber, a combustion isolation plate, a cooling chamber, and a rotating drive mechanism for driving the rotary kiln body to rotate; The front end of the rotary kiln body is rotatably and sealingly connected to a feeding chamber, and the rear end is rotatably and sealingly connected to the combustion isolation chamber. Along the direction of material advancement, the overall small-angle downward inclination of the feeding chamber, the rotary kiln body and the combustion isolation chamber is arranged; the waste gas discharge tank is connected to the feeding chamber; The combustion isolation plate is arranged in the combustion isolation chamber and divides the internal space into an activation cavity on the left side and a combustion cavity on the right side. The activation cavity is arranged close to the rotary kiln body. An interval space is provided between the top of the combustion isolation plate and the inner wall of the top of the combustion isolation chamber, so that the flue gas in the combustion cavity enters the activation cavity through the interval space; The airtight feeding mechanism is used to add deactivated activated carbon to the feeding chamber. The bottom of the activation cavity is provided with a discharge port, which is connected to the cooling chamber by a pipeline; The combustion cavity is provided with an activation steam inlet, a combustion air inlet for introducing combustion air, and a combustion gun for introducing fuel gas.

[0008] Further, the airtight feeding mechanism comprises a feeding hopper. The bottom discharge port of the feeding hopper is connected to a discharge pipe through a star-shaped discharger. The discharge pipe is sealingly penetrated into the feeding chamber.

[0009] Further, the rotating drive mechanism comprises a supporting light wheel, a kiln body gear, a kiln body roller, a rotating motor, a motor gear and a supporting device. A kiln gear is installed on the outer side of the middle part of the rotary kiln body, and kiln rollers are installed on the outer side of both ends. The kiln gear and the motor gear are meshed and connected to each other. The motor gear is rotatably mounted on the support device and is connected to the output shaft of the rotating motor. Under the action of the rotating motor, the motor gear drives the kiln gear to rotate. The supporting roller is installed on the support device, and supports the kiln body rollers on the side of the rotary kiln body. The supporting roller and the kiln body roller are connected by rolling motion.

[0010] Furthermore, the tilt angle of the rotary kiln body is 2-10°.

[0011] Furthermore, the cooling chamber is equipped with a two-stage cooling system. The first-stage cooling system is located near the feed end of the cooling chamber and includes a cooling water jacket located on the outer side of the cooling chamber. Cooling is achieved by circulating cooling water into the cooling water jacket. The second-stage cooling system is located near the discharge end of the cooling chamber and includes several air inlet chambers located at the bottom of the cooling chamber and several air outlet chambers located at the top of the cooling chamber. Cold air is circulated into each air inlet chamber at the bottom of the cooling chamber by an air fan. The air outlet of each air outlet chamber at the top of the cooling chamber is connected to an air intake pipe, which is then connected to the combustion air inlet.

[0012] The process for a low-loss-on-ignition combustion-isolated rotary kiln for regenerating activated carbon includes the following steps: S1: The airtight feeding mechanism adds deactivated activated carbon into the feed chamber at the front end of the rotary kiln. The material is gradually pushed towards the activation chamber as the rotary kiln tilts and rotates, and finally discharged from the activation chamber and enters the cooling chamber. Along the material feeding direction, the interior of the rotary kiln consists of two functional areas: a drying / preheating zone and a pyrolysis zone. S2: Natural gas, combustion air, and activation gas are introduced into the combustion chamber of the partitioned combustion chamber to burn and generate high-temperature flue gas. The flame generated by combustion is confined within the combustion chamber, so that the flame does not come into direct contact with the activated carbon bed. The high-temperature flue gas enters the activation chamber from the gap between the top of the combustion partition plate and the inner wall of the top of the partitioned combustion chamber, and then enters the rotary kiln to provide heat for the activated carbon. S3: High-temperature exhaust gas is discharged from the exhaust gas trough at the front end of the rotary kiln body. Part of the high-temperature exhaust gas is returned and mixed with the combustion air in proportion before being sent into the partitioned combustion chamber.

[0013] This invention relates to a rotary kiln installed at a small angle and rotating slowly and continuously during operation. Deactivated activated carbon is added via an airtight feeding mechanism and moves slowly towards the kiln tail due to its own weight and the tumbling action of the rotating kiln body, thus achieving continuous solid conveying. The interior of the rotary kiln is functionally segmented along the material's direction of travel, including: a drying / preheating section for removing moisture and light volatiles; and a pyrolysis section where, under a high-temperature and oxygen-deficient atmosphere, organic pollutants and coke deposits adsorbed in the pores of the activated carbon undergo thermal decomposition, volatilization, and release from the pores. A combustion baffle plate is installed within the combustion chamber, dividing its internal space into an activation chamber on the left and a combustion chamber on the right. High-temperature flue gas from the combustion chamber enters the activation chamber, gently activating the carbon skeleton to restore its microporous structure, specific surface area, and adsorption capacity.

[0014] In terms of heating method, this invention employs combustion-isolated direct heating: fuel gas (such as natural gas) is introduced into the combustion chamber and fully combusted under the action of combustion air to form high-temperature flue gas. The flame generated by combustion is confined within the combustion chamber, and the flame does not directly enter the activation chamber containing activated carbon material, nor does it come into direct contact with the activated carbon bed. The high-temperature flue gas is introduced into the activation chamber and the rotary kiln body as a heat transfer medium, providing heat to the drying / preheating section, pyrolysis section, and activation section in sequence, and transferring heat with the regenerating activated carbon through convection and radiation heat transfer.

[0015] The above structure means that the present invention does not directly scour the material with flames, but instead distributes heat into the kiln with the high-temperature flue gas formed after combustion. This maintains the high heat transfer efficiency, compact structure and concentrated heat utilization of direct heating, while significantly reducing the risks of overheating, sintering and instantaneous oxidation caused by localized direct flame blowing, which is common in traditional direct fire heating. This helps to suppress excessive burn-off of activated carbon in the high-temperature section, thereby achieving low burn-off rate operation.

[0016] In terms of exhaust gas and emission control, the volatile organic compounds, pyrolysis gas, combustible gas and other exhaust gases released in the activation chamber and rotary kiln during the drying, pyrolysis and activation processes are extracted in a centralized manner through the exhaust gas discharge tank, and then discharged through the exhaust gas outlet into the exhaust gas treatment unit at the back end for purification treatment such as catalytic combustion, desulfurization and denitrification, so as to achieve emission standards.

[0017] In terms of cooling and waste heat recovery of regenerated activated carbon, this invention employs a two-stage cooling system. The regenerated high-temperature activated carbon enters the cooling chamber, where it is first cooled by the first-stage cooling system. Circulating cooling water is used to exchange heat with the carbon, rapidly lowering its temperature from the regeneration activation temperature to a medium temperature range where it is less prone to spontaneous combustion. Subsequently, the activated carbon enters the second-stage cooling system in the cooling chamber, where it undergoes forced-air cooling, further reducing its temperature to a safe discharge temperature to prevent the particles from reigniting or continuing to oxidize in the air. The circulating cooling air heated in the second-stage cooling process is not directly discharged but is returned to the isolated combustion chamber as combustion aid or preheating gas, achieving waste heat recovery and reducing system energy consumption.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) This invention physically isolates the activation chamber from the combustion chamber. Fuel completes full combustion within an independent combustion chamber, and the flame is confined within the combustion chamber, not directly entering the activated chamber where the material is charged. Only the high-temperature flue gas generated after combustion is introduced into the rotary kiln for heating. Compared to the traditional rotary kiln regeneration method of "direct flame sweeping of the material bed," this structure significantly reduces instantaneous overheating, carbon particle sintering, and high-oxygen local combustion caused by localized flame scouring, while maintaining high direct heating heat transfer efficiency and structural compactness. This greatly inhibits excessive oxidation of activated carbon and reduces the loss on ignition rate.

[0019] 2) The regenerated activated carbon of this invention is first rapidly cooled by circulating cooling water under the action of the first-stage cooling system to prevent the high-temperature carbon from being directly exposed to the air and causing spontaneous combustion or continuous oxidation; then it undergoes secondary forced-air cooling to reduce the temperature to a safe discharge temperature. The circulating gas heated during the secondary cooling process is not directly discharged, but is returned to the combustion chamber through the circulation pipeline for use as combustion aid or preheating gas, thereby realizing waste heat recovery and reducing the energy consumption of the entire system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a combustion-isolated regenerated activated carbon rotary kiln equipment and its process with low burn-off rate according to the present invention. In the diagram: 1. Exhaust gas discharge trough; 2. Feed hopper; 3. Supporting roller; 4. Rotary motor; 5. Kiln body roller; 6. Rotary kiln body; 7. Kiln body gear; 8. Activating steam inlet; 9. Combustion air inlet; 10. Isolation combustion chamber; 11. Combustion gun; 12. Air inlet chamber; 13. Cooling chamber; 14. Combustion partition plate; 15. Cooling water jacket. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0022] Example: Control Figure 1 A low-loss-on-ignition combustion-isolated rotary kiln for regenerating activated carbon includes a rotary kiln body 6, a waste gas discharge trough 1, an isolated combustion chamber 10, a combustion isolation plate 14, a cooling chamber 13, and a rotary drive mechanism for driving the rotary kiln body 6 to rotate.

[0023] The front end of the rotary kiln body 6 is rotatably and sealingly connected to the feed chamber, and the rear end is rotatably and sealingly connected to the isolation combustion chamber 10. Along the material forward direction, the feed chamber, the rotary kiln body 6, and the isolation combustion chamber 10 are inclined downward at a small angle. The exhaust gas discharge trough 1 is connected to the feed chamber.

[0024] The combustion partition plate 14 is disposed in the combustion chamber 10 and divides its internal space into an activation chamber on the left and a combustion chamber on the right. The activation chamber is disposed close to the rotary kiln body 6. There is an interval space between the top of the combustion partition plate 14 and the top inner wall of the combustion chamber 10 so that the flue gas in the combustion chamber can enter the activation chamber through the interval space.

[0025] An airtight feeding mechanism is used to add deactivated activated carbon into the feeding chamber. The bottom of the activation chamber is provided with a discharge port and is connected to the cooling chamber 13 by a pipeline.

[0026] The combustion chamber is equipped with an activation steam inlet 8, a combustion air inlet 9 for introducing combustion air, and a combustion gun 11 for introducing fuel gas.

[0027] The airtight feeding mechanism includes a feeding hopper 2. The bottom outlet of the feeding hopper 2 is connected to a discharge pipe through a star-shaped discharge device. The discharge pipe is sealed and inserted into the feeding chamber.

[0028] The rotary drive mechanism includes a supporting roller 3, a kiln body gear 7, a kiln body roller 5, a rotary motor 4, a motor gear, and a support device. The kiln body gear 7 is installed on the outer side of the middle part of the rotary kiln body 6, and the kiln body roller 5 is installed on the outer side of both ends. The kiln body gear 7 is meshed with the motor gear. The motor gear is rotatably mounted on the support device and is connected to the output shaft of the rotary motor 4. Under the action of the rotary motor 4, the motor gear drives the kiln body gear 7 to rotate. The supporting roller 3 is installed on the support device and supports the kiln body roller 5 on the side of the rotary kiln body 6. The supporting roller 3 and the kiln body roller 5 are in rolling connection.

[0029] The cooling chamber 13 is equipped with a two-stage cooling system. The first-stage cooling system is located near the feed end of the cooling chamber 13 and includes a cooling water jacket 15 located on the outer side of the cooling chamber 13. Cooling is achieved by introducing cooling water into the cooling water jacket. The second-stage cooling system is located near the discharge end of the cooling chamber 13 and includes several air inlet chambers 12 located at the bottom of the cooling chamber 13 and several air outlet chambers located at the top of the cooling chamber 13. Cold air is introduced into each air inlet chamber at the bottom of the cooling chamber 13 by an air fan. The air outlet of each air outlet chamber at the top of the cooling chamber 13 is connected to an air intake pipe, which is then connected to the combustion air inlet 9.

[0030] The rotary kiln body 6 is a hollow cylindrical structure, arranged at a small angle along its axis, with the kiln head (feed end) at a higher position and the kiln tail (discharge end) at a lower position. The rotary kiln body 6 is installed at an inclination angle of 3° relative to the horizontal, so that the material moves slowly and stably towards the kiln tail under its own weight. The rotary kiln body 6 is supported by the supporting roller 3 and the kiln body roller 5. The rotating motor 4 drives the rotary kiln body 6 to rotate continuously at a low speed of 1 rpm through the kiln body gear 7, so that the material is continuously tumbled and propelled in a spiral manner inside the cylinder.

[0031] Deactivated activated carbon is continuously added to the feed chamber through the feed funnel 2 located at the kiln head, and then enters the rotary kiln body 6. The feed funnel 2 adopts an airtight structure to reduce the direct entry of outside air into the rotary kiln body 6 at the feed point. With the coordination of the tilt angle and rotation speed of the rotary kiln body 6, the activated carbon gradually moves from the high end to the low end, realizing continuous feeding and continuous discharge. Through the above arrangement, the total residence time of a single batch of activated carbon in the rotary kiln body 6 can be controlled within 60 minutes, ensuring that the three stages of drying / preheating, pyrolysis, and high-temperature activation are completed sequentially.

[0032] The drying / preheating zone of the rotary kiln body 6 is located on the left side near the feed hopper 2. This zone is mainly used to remove moisture, light volatiles and residual solvents. The operating temperature of this zone is preferably controlled at 200 ℃ to drive out moisture and low-boiling-point components under low-risk conditions, thereby avoiding unstable combustion or local overheating caused by instantaneous large-scale volatilization in the subsequent high-temperature zone.

[0033] The pyrolysis zone 6 of the rotary kiln body is located on the right side near the activation chamber. This zone operates in a near-oxygen-deficient atmosphere, with the temperature controlled at 400℃. Within this zone, organic pollutants and coke deposits adsorbed in the activated carbon pores undergo pyrolysis and volatilization, gradually releasing them from the activated carbon framework, thus initially unclogging the carbon pores. To prevent the activated carbon itself from being oxidized and burned, the oxygen content in this zone is controlled to be no more than 2% by volume, maintaining a "non-oxidizing atmosphere" rather than an oxygen-enriched combustion atmosphere.

[0034] The activation zone, located within the activation chamber of the partitioned combustion chamber 10, is the highest temperature section for activated carbon regeneration. The operating temperature in this zone is preferably controlled at 800 °C, and a quantitative amount of activation medium, water vapor, is introduced through the activation steam inlet 8. This activation medium gently activates the carbon skeleton at high temperature, reopening blocked pores and restoring the microporous structure, thereby restoring the specific surface area and adsorption capacity of the activated carbon. The activation zone also maintains low-oxygen operation, preferably with an oxygen content ≤2%, to avoid significant direct oxidation and ablation of the carbon skeleton at high temperatures.

[0035] The heat for the rotary kiln body 6 and the activation chamber originates from the isolated combustion chamber 10. The combustion chamber, activation chamber, and rotary kiln body 6 are spatially connected but structurally partially separated by a combustion partition plate 14. During combustion chamber operation, the combustion gun 11 injects fuel gas (natural gas) into the combustion chamber, which mixes and burns with the combustion air supplied by the combustion air inlet 9. This combustion process is completed inside the combustion chamber, where the flame is confined and does not directly penetrate the activation chamber containing activated carbon, nor does it directly wash over the regenerating carbon layer. The high-temperature flue gas generated after combustion is homogenized within the isolated combustion chamber 10 and then introduced into the rotary kiln body 6, where it provides heat to various sections of the kiln through convective and radiative heat transfer between the high-temperature flue gas and the material.

[0036] The temperature of the high-temperature flue gas after combustion can be controlled within the range of 800–1200 ℃, and gradually distributed to the drying / preheating zone, pyrolysis zone, and activation zone to achieve axial segmented heating. Since the high-temperature flue gas, rather than "bare fire," enters the rotary kiln body 6, the heating within the kiln body is "combustion-interrupted direct heating": combustion heating is still used, and the flue gas directly contacts the material, but the combustion flame itself does not directly sweep the material bed. Compared with traditional direct-fired rotary kilns (where the flame tongue extends directly into the kiln cavity, locally enriching oxygen and burning the carbon particles at high temperatures), this interrupted heating method significantly reduces the risks of localized instantaneous overheating, localized oxygen-rich zones, carbon particle sintering, and rapid oxidation of the skeleton. This helps to reduce the burn-off rate and, while ensuring heat transfer efficiency and structural compactness, improves the mechanical integrity of the regenerated activated carbon.

[0037] Volatile organic compounds, pyrolysis gases, and combustible gases released during the drying / preheating, pyrolysis, and activation processes are collected and directed into exhaust gas trough 1 via the flue gas collection area on one side of the kiln head. Exhaust gas trough 1 then sends the exhaust gas to the downstream exhaust gas treatment unit for purification.

[0038] After activation, the high-temperature regenerated activated carbon continuously falls from the kiln tail into cooling chamber 13. Cooling chamber 13 employs a two-stage cooling structure: the first stage involves heat exchange with cooling water for rapid cooling, quickly reducing the regenerated activated carbon from a high temperature of 700–850 °C to a medium temperature range where it is less prone to spontaneous combustion; the second stage introduces cooling air to further cool the medium-temperature carbon particles. After being treated in cooling chamber 13 for 5–20 minutes, the temperature of the regenerated activated carbon drops below 120 °C before being discharged, thus preventing spontaneous combustion, secondary oxidation, or continuous weight loss of the high-temperature carbon upon contact with air. During the second-stage cooling process, the circulating gas heated by the activated carbon is not directly discharged but is returned to the isolated combustion chamber 10 via a circulation pipeline for reuse as a combustion aid or preheating gas source, achieving waste heat recovery and reducing system energy consumption.

[0039] Under the aforementioned structure and operating conditions, the regenerated activated carbon sequentially undergoes dehydration, thermal desorption, and high-temperature activation, reopening the pores and restoring its specific surface area and adsorption capacity. The high-temperature section is always in a low-oxygen environment, while the activation section operates in a positive-pressure steam atmosphere. Through the "flame limiting - flue gas heating" heating mode achieved by the isolated combustion chamber 10 and the closed cooling / hot air return path at the kiln tail, this embodiment can control the skeleton carbon loss (burn-off rate, i.e., the proportion of carbon mass loss to the original carbon mass) of the regenerated activated carbon to no more than 15%, which is significantly lower than the high loss level caused by local oxygen-enriched high-temperature scouring in the traditional direct-fired rotary kiln regeneration process, while maintaining the regeneration efficiency and industrial scalability under continuous operating conditions.

[0040] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A low-loss-on-ignition combustion-isolated rotary kiln for regenerating activated carbon, characterized in that, It includes an airtight feeding mechanism, a rotary kiln body (6), a waste gas discharge trough (1), a partitioned combustion chamber (10), a combustion partition plate (14), a cooling chamber (13), and a rotary drive mechanism for driving the rotary kiln body (6) to rotate; The front end of the rotary kiln body (6) is rotatably and sealed to the feed chamber, and the rear end is rotatably and sealed to the isolation combustion chamber (10). Along the material forward direction, the feed chamber, the rotary kiln body (6) and the isolation combustion chamber (10) are inclined downward at a small angle as a whole; the exhaust gas discharge trough (1) is connected to the feed chamber. The combustion partition plate (14) is installed in the partitioned combustion chamber (10) and divides its internal space into an activation chamber on the left and a combustion chamber on the right. The activation chamber is located close to the rotary kiln body (6). There is an interval space between the top of the combustion partition plate (14) and the top inner wall of the partitioned combustion chamber (10) so that the flue gas in the combustion chamber can enter the activation chamber through the interval space. The airtight feeding mechanism is used to add deactivated activated carbon into the feeding chamber. The bottom of the activation chamber is provided with a discharge port and is connected to the cooling chamber (13) by a pipeline. The combustion chamber is provided with an activation steam inlet (8), a combustion air inlet (9) for introducing combustion air, and a combustion gun (11) for introducing fuel gas.

2. The low-loss-on-ignition combustion-isolated rotary kiln equipment for regenerating activated carbon as described in claim 1, characterized in that, The airtight feeding mechanism includes a feeding funnel (2), and the bottom outlet of the feeding funnel (2) is connected to the discharge pipe through a star-shaped discharge device. The discharge pipe is sealed and inserted into the feeding chamber.

3. The low-loss-on-ignition combustion-isolated rotary kiln equipment for regenerating activated carbon as described in claim 1, characterized in that, The rotary drive mechanism includes a support wheel (3), a kiln gear (7), a kiln roller (5), a rotary motor (4), a motor gear, and a support device. A kiln gear (7) is provided on the outer side of the middle part of the rotary kiln body (6), and kiln rollers (5) are provided on the outer side of both ends. The kiln gear (7) is meshed with the motor gear. The motor gear is rotatably mounted on the support device and connected to the output shaft of the rotating motor (4). Under the action of the rotating motor (4), the motor gear drives the kiln gear (7) to rotate. The supporting roller (3) is installed on the support device. The supporting roller (3) supports the kiln body roller (5) on the side of the rotary kiln body (6). The supporting roller (3) and the kiln body roller (5) are connected by rolling.

4. The low-loss-on-ignition combustion-isolated rotary kiln equipment for regenerating activated carbon as described in claim 1, characterized in that, The tilt angle of the rotary kiln body (6) is 2-10°.

5. The low-loss-on-ignition combustion-isolated rotary kiln equipment for regenerating activated carbon as described in claim 1, characterized in that, The cooling chamber (13) is provided with a two-stage cooling system. The first-stage cooling system is located near the feed end of the cooling chamber (13) and includes a cooling water jacket (15) located on the outer side of the cooling chamber (13). Cooling is achieved by introducing cooling water into the cooling water jacket. The second-stage cooling system is located near the discharge end of the cooling chamber (13) and includes several air inlet chambers (12) located at the bottom of the cooling chamber (13) and several air outlet chambers located at the top of the cooling chamber (13). Cold air is introduced into each air inlet chamber at the bottom of the cooling chamber (13) by an air fan. The air outlet of each air outlet chamber at the top of the cooling chamber (13) is connected to an air intake pipe, which is then connected to the combustion air inlet (9).

6. The process of a low-loss-on-ignition combustion-isolated rotary kiln for regenerating activated carbon as described in claim 1, characterized in that, Includes the following steps: S1: The airtight feeding mechanism adds deactivated activated carbon into the feed chamber at the front end of the rotary kiln body (6). The material is gradually pushed to the direction of the activation chamber as the rotary kiln body (6) tilts and rotates. Finally, the material is discharged from the activation chamber and enters the cooling chamber (13). Along the material feeding direction, the interior of the rotary kiln body (6) consists of two functional areas: a drying / preheating zone and a pyrolysis zone. S2: Natural gas, combustion air and activation gas are introduced into the combustion chamber of the partitioned combustion chamber (10) to burn and generate high-temperature flue gas. The flame generated by the combustion is confined within the combustion chamber so that the flame does not come into direct contact with the activated carbon bed. The high-temperature flue gas enters the activation chamber from the gap between the top of the combustion partition plate (14) and the inner wall of the top of the partitioned combustion chamber (10), and then enters the rotary kiln body (6) to provide heat for the activated carbon. S3: The high-temperature exhaust gas is discharged from the exhaust gas discharge trough (1) at the front end of the rotary kiln body (6), and some of the high-temperature exhaust gas is returned and mixed with the combustion air in proportion before being sent into the partitioned combustion chamber (10).

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