Pyrolysis processing device for preparing biochar from sludge

Abstract

The invention belongs to the technical field of biochar preparation, and discloses a pyrolysis processing device for preparing biochar from sludge, the pyrolysis processing device comprises a pyrolysis tank, the bottom end of the pyrolysis tank is fixedly communicated with a discharging tank, the top end of the pyrolysis tank is fixedly provided with an air inlet assembly, the left and right sides of the top end of the pyrolysis tank are fixedly communicated with feeding ports, and the left and right sides of the top end of the pyrolysis tank are fixedly communicated with an air inlet assembly. And a main shaft is movably mounted in the middle of the pyrolysis tank. Nitrogen input in the pyrolysis process is utilized, sludge is heated through high-temperature and high-pressure nitrogen, meanwhile, a channel in the bottom end of the machine frame is automatically closed to complete sealing through the cooperation effect between the air inlet assembly and the sealing plug after nitrogen is input, and meanwhile after pyrolysis is finished, the nitrogen can be heated through the sealing plug. The channel at the bottom end of the rack is automatically opened to complete discharging, and meanwhile, the dredging head automatically ascends to dredge the bottom end of the rack, so that the problems that a traditional device cannot be automatically sealed after nitrogen is injected and is easy to block during discharging are solved, and the pyrolysis quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of biochar preparation, and in particular relates to a pyrolysis processing device for preparing biochar from sludge. Background Art

[0002] Sludge biochar (biochar) is a process that converts sludge into biochar through pyrolysis and other technologies, aiming to achieve resource utilization of sludge and environmental protection. With the acceleration of urbanization, the amount of sewage treatment continues to increase, and sludge is also produced in large quantities as a by-product of the sewage treatment process. Traditional sludge treatment methods such as landfill and incineration have disadvantages such as large land area and secondary pollution. Therefore, it is imperative to develop an environmentally friendly and efficient sludge treatment method. The emergence of sludge biochar technology has provided a new direction for the resource utilization of sludge, which has important environmental significance and economic value. In the process of preparing biochar from sludge, pyrolysis processing equipment is often required to process biochar. Conventional pyrolysis processing equipment is mainly composed of a pyrolysis tank mixing device. When processing biochar, sludge will be put into the pyrolysis tank and mixed by the mixing device. It will be heated at the same time. At the same time, in order to accelerate the mixing effect, nitrogen is usually injected into the pyrolysis tank to accelerate the pyrolysis effect. However, during the nitrogen injection process, there are problems of nitrogen overflow and blockage at the bottom discharge end, resulting in poor overall pyrolysis quality.

[0003] At the same time, during the pyrolysis process, due to the mixing of the mixing device and the adhesion of the sludge, a certain amount of sludge will adhere to the inside of the pyrolysis tank. Due to the heating, the moisture of the sludge is evaporated, causing part of the sludge to solidify inside the pyrolysis tank, which will not only lead to a decrease in the pyrolysis quality, but also affect the overall pyrolysis efficiency, and urgently needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a pyrolysis processing device for preparing biochar from sludge to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a pyrolysis processing device for preparing biochar from sludge, comprising a pyrolysis tank, the bottom end of the pyrolysis tank is fixedly connected to a discharge tank, the top of the pyrolysis tank is fixedly installed with an air intake assembly, the left and right sides of the top of the pyrolysis tank are fixedly connected with feed ports, a main shaft is movably installed in the middle of the pyrolysis tank, the left and right sides of the outer side of the main shaft are provided with card slots, the main shaft is movably connected with a movable ring through the card slot, the movable ring is displaced up and down relative to the main shaft, the outer side of the movable ring is movably sleeved with a mixing assembly located inside the pyrolysis tank, an upper extension rod is fixedly installed in the middle of the top of the movable ring, the upper extension rod passes through the top of the main shaft and is located at the top of the pyrolysis tank, and the top of the upper extension rod is connected to the bottom end of the air intake assembly.

[0006] When preparing biochar, the sludge can be injected into the interior of the pyrolysis tank through the feed port, and the external nitrogen delivery device is connected to the top of the air intake assembly to complete the preparation before the pyrolysis process.

[0007] As a further technical solution of the present invention, a base is fixedly installed on the rear side of the top of the pyrolysis tank, a motor is fixedly installed on the inner side of the base, and a driving gear is fixedly installed on the output end of the motor.

[0008] As a further technical solution of the present invention, a driven gear ring is fixedly sleeved on the outer side of the main shaft and located at the top of the pyrolysis tank, and a driving gear is fixedly installed on the output end of the motor, and the driving gear is meshingly connected with the driven gear ring.

[0009] During the pyrolysis of biochar, since the sludge has been put into the pyrolysis tank, the motor can be turned on to drive the driving gear at the bottom to rotate. At this time, the driving gear can drive the driven gear ring in the meshing state to rotate, and at the same time drive the main shaft in the middle of the driven gear ring to rotate. At this time, the mixing component on the outer side of the main shaft rotates accordingly to assist in completing the mixing process.

[0010] As a further technical solution of the present invention, the air intake assembly includes an air storage pipe, the outer side of the air storage pipe is fixedly sleeved with an extension frame, the bottom end of the extension frame is connected to the top of the pyrolysis tank, and the top of the extension frame is fixedly connected to an air intake valve.

[0011] As a further technical solution of the present invention, the gas storage pipe is movably sleeved with a piston plate, the bottom end of the piston plate is fixedly connected with a piston rod, the bottom end of the piston rod passes through the bottom end of the gas storage pipe and is connected to the top end of the upper extension rod.

[0012] As a further technical solution of the present invention, a gas pipe is fixedly connected to the front side of the outer side of the extension frame and near the bottom end, the other end of the gas pipe is fixedly connected to the top of the pyrolysis tank, and a limit spring is movably sleeved on the outer side of the piston rod, and the upper and lower ends of the limit spring are respectively connected to the bottom end of the piston plate and the bottom end of the inner cavity of the gas storage tube.

[0013] Before the pyrolysis process, the external nitrogen can be heated and pressurized and then injected into the interior of the intake valve. At this time, the piston plate will move downward under the pressure, driving the piston rod to move downward until the piston plate moves to the bottom of the gas pipe. At this time, the high-pressure and high-temperature nitrogen can be discharged through the gas pipe and introduced into the interior of the pyrolysis tank through the gas pipe to heat the internal sludge and discharge the air at the same time, thereby assisting in completing the pyrolysis process.

[0014] As a further technical solution of the present invention, a lower extension rod located inside the frame is fixedly installed in the middle of the bottom end of the movable ring, a dredging head is fixedly installed at the bottom end of the lower extension rod, and a sealing plug is fixedly installed at the bottom end of the dredging head.

[0015] As a further technical solution of the present invention, when the piston plate is at the lowest point, the dredging head and the sealing plug are also at the lowest point, and the sealing plug completely seals the bottom end of the frame.

[0016] At the same time, before the pyrolysis process, when nitrogen is not input into the interior of the air intake assembly, the sealing plug does not seal the bottom end of the frame. When nitrogen is input, the dredging head and the sealing plug automatically descend until the sealing plug completely seals the bottom end of the frame and exhausts the air inside the pyrolysis tank until the interior of the pyrolysis tank is filled with high-temperature nitrogen, and then the pyrolysis stirring process is carried out; After the pyrolysis is completed, the nitrogen input into the air intake assembly is stopped, and the limit spring is automatically reset, which can drive the piston plate and the piston rod to rise. At this time, the lower extension rod, the dredging head and the sealing plug automatically rise, and the biochar after the pyrolysis is completed is discharged through the bottom of the frame, completing the pyrolysis process.

[0017] By utilizing the nitrogen input during the pyrolysis process, the sludge is heated by high-temperature and high-pressure nitrogen. At the same time, the cooperation between the air intake component and the sealing plug can automatically close the channel at the bottom of the frame to complete the sealing after the nitrogen is input. At the same time, after the pyrolysis is completed, the channel at the bottom of the frame is automatically opened to complete the discharge. At the same time, the clearing head automatically rises to clear the bottom of the frame, avoiding the problem that the traditional device cannot automatically seal after nitrogen injection and the discharge is easily blocked, thereby improving the quality of pyrolysis.

[0018] As a further technical solution of the present invention, the mixing assembly includes a movable frame, which is fixedly sleeved with the outer side surface of the movable ring, and the upper and lower ends of the movable frame are axially equidistantly installed with adjusting rods, and the adjusting ends of the adjusting rods are fixedly installed with mixing rods, and the outer side surface of the movable frame is fixedly sleeved with a scraper ring, and the outer side surface of the scraper ring is in contact with the inner side surface of the pyrolysis tank.

[0019] When the main shaft rotates, it can drive the movable frame to rotate synchronously. At this time, the scraper ring located on the outer side of the movable frame rotates synchronously, and at the same time, it can drive multiple mixing rods to rotate circumferentially to mix and stir the inside of the pyrolysis tank. At the same time, the length of the adjusting rod can be adjusted to complete the height adjustment of the mixing rod to assist in completing the mixing process; At the same time, when nitrogen is input, the downward displacement of the upper extension rod can synchronously drive the movable ring to move downward, and finally drive the scraper ring to move relative to the pyrolysis tank, so as to clean the inner wall of the pyrolysis tank, automatically scrape off the residual sludge on the inner wall, and complete the auxiliary cleaning process.

[0020] By reusing the nitrogen input during the pyrolysis process, the system can automatically seal the inner wall of the pyrolysis tank when the pyrolysis is completed, and automatically remove the residual sludge on the inner wall of the pyrolysis tank to avoid drying caused by long-term adhesion of the sludge. The entire cleaning process is automatically completed with the pyrolysis, without the need for manual cleaning, which effectively improves the pyrolysis quality and the overall pyrolysis efficiency.

[0021] The beneficial effects of the present invention are as follows: (1) The present invention utilizes the nitrogen input during the pyrolysis process. While heating the sludge with high-temperature and high-pressure nitrogen, the air inlet assembly and the sealing plug cooperate to automatically close the channel at the bottom of the frame to complete the sealing after the nitrogen is input. At the same time, after the pyrolysis is completed, the channel at the bottom of the frame is automatically opened to complete the discharge. At the same time, the unblocking head automatically rises to unblock the bottom of the frame, thereby avoiding the problem that the traditional device cannot automatically seal after nitrogen injection and the discharge is easily blocked, thereby improving the pyrolysis quality.

[0022] (2) The present invention reuses the nitrogen input during the pyrolysis process. When the pyrolysis is completed, the inner wall of the pyrolysis tank can be automatically scraped and the residual sludge on the inner wall of the pyrolysis tank can be automatically removed to avoid the drying phenomenon caused by the long-term adhesion of the sludge. The entire cleaning process is automatically completed with the pyrolysis, and no manual auxiliary cleaning is required, which effectively improves the pyrolysis quality and the overall pyrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the coordination of the pyrolysis tank, the discharge tank and the air intake assembly structure of the present invention; Figure 3 It is a separate schematic diagram of the structure of the air intake assembly of the present invention; Figure 4 It is a separate cross-sectional schematic diagram of the internal structure of the air intake assembly of the present invention; Figure 5 It is a cross-sectional schematic diagram of the internal structure of the pyrolysis tank and the discharge tank of the present invention; Figure 6 It is a schematic diagram of the coordination of the main shaft and the mixing assembly structure of the present invention; Figure 7 It is a schematic diagram of the coordination of the main shaft and the movable ring structure of the present invention; Figure 8 It is a separate schematic diagram of the structure of the mixing assembly of the present invention.

[0024] In the figure: 1. pyrolysis tank; 2. frame; 3. discharge tank; 4. air intake assembly; 401. extension frame; 402. air storage pipe; 403. air intake valve; 404. piston plate; 405. piston rod; 406. limit spring; 407. air delivery pipe; 5. machine base; 6. motor; 7. driving gear; 8. driven gear ring; 9. main shaft; 10. slot; 11. movable ring; 12. upper extension rod; 13. lower extension rod; 14. dredging head; 15. sealing plug; 16. mixing assembly; 161. movable frame; 162. adjusting rod; 163. mixing rod; 164. scraper ring; 17. feed port. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0026] like Figures 1 to 8As shown, in an embodiment of the present invention, a pyrolysis processing device for preparing biochar from sludge includes a pyrolysis tank 1, the bottom end of the pyrolysis tank 1 is fixedly connected to a discharge tank 3, the top of the pyrolysis tank 1 is fixedly installed with an air intake assembly 4, the left and right sides of the top of the pyrolysis tank 1 are fixedly connected with a feed port 17, a main shaft 9 is movably installed in the middle of the pyrolysis tank 1, and slots 10 are provided on the left and right sides of the outer side of the main shaft 9. The main shaft 9 is movably connected with a movable ring 11 through the slot 10, and the movable ring 11 is displaced up and down relative to the main shaft 9. The outer side of the movable ring 11 is movably sleeved with a mixing assembly 16 located inside the pyrolysis tank 1, and an upper extension rod 12 is fixedly installed in the middle of the top of the movable ring 11. The upper extension rod 12 passes through the top of the main shaft 9 and is located at the top position of the pyrolysis tank 1, and the top of the upper extension rod 12 is connected to the bottom end of the air intake assembly 4.

[0027] When preparing biochar, the sludge can be injected into the interior of the pyrolysis tank 1 through the feed port 17, and at the same time, the external nitrogen delivery device is connected to the top of the air intake assembly 4 to complete the preparation before the pyrolysis process.

[0028] like Figure 1 and Figure 4 As shown, a base 5 is fixedly installed on the rear side of the top of the pyrolysis tank 1, a motor 6 is fixedly installed on the inner side of the base 5, a driving gear 7 is fixedly installed on the output end of the motor 6, a driven gear ring 8 is fixedly sleeved on the outer side of the main shaft 9 and located at the top of the pyrolysis tank 1, a driving gear 7 is fixedly installed on the output end of the motor 6, and the driving gear 7 and the driven gear ring 8 are meshingly connected.

[0029] When the biochar is being pyrolyzed, since the sludge has been put into the pyrolysis tank 1, the motor 6 can be turned on to drive the driving gear 7 at the bottom to rotate. At this time, the driving gear 7 can drive the driven gear ring 8 in the meshing state to rotate, and at the same time drive the main shaft 9 in the middle of the driven gear ring 8 to rotate. At this time, the mixing component 16 on the outer side of the main shaft 9 rotates accordingly to assist in completing the mixing process.

[0030] like Figure 1 and Figure 2 as well as Figure 3 and Figure 4As shown, the air intake assembly 4 includes an air storage pipe 402, the outer side surface of the air storage pipe 402 is fixedly sleeved with an extension frame 401, the bottom end of the extension frame 401 is connected to the top of the pyrolysis tank 1, the top of the extension frame 401 is fixedly connected with an air intake valve 403, the inside of the air storage pipe 402 is movably sleeved with a piston plate 404, the bottom end of the piston plate 404 is fixedly connected with a piston rod 405, the bottom end of the piston rod 405 passes through the bottom end of the air storage pipe 402 and is connected to the top of the upper extension rod 12, the front side of the outer side surface of the extension frame 401 and the position close to the bottom end are fixedly connected with an air supply pipe 407, the other end of the air supply pipe 407 is fixedly connected to the top of the pyrolysis tank 1, the outer side surface of the piston rod 405 is movably sleeved with a limit spring 406, and the upper and lower ends of the limit spring 406 are respectively connected to the bottom end of the piston plate 404 and the bottom end of the inner cavity of the air storage pipe 402.

[0031] Before the pyrolysis process is carried out, the external nitrogen can be heated and pressurized and then injected into the interior of the intake valve 403. At this time, the piston plate 404 is displaced downward by the pressure, that is, the piston rod 405 is driven to move downward until the piston plate 404 moves to the bottom end of the gas pipe 407. At this time, the high-pressure and high-temperature nitrogen can be discharged through the gas pipe 407 and introduced into the interior of the pyrolysis tank 1 through the gas pipe 407 to heat the internal sludge and discharge the air at the same time, thereby assisting in completing the pyrolysis process.

[0032] like Figure 5 and Figure 6 as well as Figure 7 As shown, a lower extension rod 13 located inside the frame 2 is fixedly installed in the middle of the bottom end of the movable ring 11, a dredging head 14 is fixedly installed at the bottom end of the lower extension rod 13, and a sealing plug 15 is fixedly installed at the bottom end of the dredging head 14. When the piston plate 404 is at the lowest point, the dredging head 14 and the sealing plug 15 are also at the lowest point, and the sealing plug 15 completely seals the bottom end of the frame 2.

[0033] Embodiment: Before the pyrolysis process, when nitrogen is not input into the air inlet assembly 4, the sealing plug 15 does not seal the bottom end of the frame 2. After the nitrogen is input, the dredging head 14 and the sealing plug 15 automatically descend until the sealing plug 15 completely seals the bottom end of the frame 2 and exhausts the air inside the pyrolysis tank 1 until the inside of the pyrolysis tank 1 is filled with high-temperature nitrogen, and then the pyrolysis stirring process is performed; After the pyrolysis is completed, the nitrogen input into the air intake assembly 4 is stopped, and the limit spring 406 is automatically reset, which can drive the piston plate 404 and the piston rod 405 to rise. At this time, the lower extension rod 13, the dredging head 14 and the sealing plug 15 automatically rise, and the biochar after the pyrolysis is completed is discharged through the bottom end of the frame 2, completing the pyrolysis process.

[0034] By utilizing the nitrogen input during the pyrolysis process, the sludge is heated by the high-temperature and high-pressure nitrogen. The air intake assembly 4 and the sealing plug 15 cooperate to automatically close the channel at the bottom of the frame 2 to complete the sealing after the nitrogen is input. At the same time, after the pyrolysis is completed, the channel at the bottom of the frame 2 is automatically opened to complete the discharge. At the same time, the dredging head 14 automatically rises to dredge the bottom of the frame 2, thereby avoiding the problem that the traditional device cannot automatically seal after the nitrogen is injected, and the discharge is easily blocked, thereby improving the pyrolysis quality.

[0035] like Figure 1 and Figure 5 as well as Figure 6 and Figure 8 As shown, the mixing assembly 16 includes a movable frame 161, which is fixedly sleeved with the outer side surface of the movable ring 11, and the upper and lower ends of the movable frame 161 are axially equidistantly installed with adjusting rods 162, and the adjusting ends of the adjusting rods 162 are fixedly installed with mixing rods 163. The outer side surface of the movable frame 161 is fixedly sleeved with a scraper ring 164, and the outer side surface of the scraper ring 164 is in contact with the inner side surface of the pyrolysis tank 1.

[0036] Embodiment: When the main shaft 9 rotates, the movable frame 161 can be driven to rotate synchronously. At this time, the scraper ring 164 located on the outer side of the movable frame 161 rotates synchronously, and at the same time, multiple mixing rods 163 can be driven to rotate circumferentially to mix and stir the inside of the pyrolysis tank 1. At the same time, the length of the adjusting rod 162 can be adjusted to complete the height adjustment of the mixing rod 163, thereby assisting in completing the mixing process; At the same time, when nitrogen is input, the downward displacement of the upper extension rod 12 can synchronously drive the movable ring 11 to move downward, and finally drive the scraper ring 164 to move relative to the pyrolysis tank 1, so as to clean the inner wall of the pyrolysis tank 1, automatically scrape off the sludge remaining on the inner wall, and complete the auxiliary cleaning process.

[0037] By reusing the nitrogen input during the pyrolysis process, the inner wall of the pyrolysis tank 1 can be automatically scraped and automatically sealed when the pyrolysis is completed, and the sludge remaining on the inner wall of the pyrolysis tank 1 can be automatically removed to avoid drying caused by long-term adhesion of the sludge. The entire cleaning process is automatically completed with the pyrolysis, and no manual auxiliary cleaning is required, which effectively improves the pyrolysis quality and the overall pyrolysis efficiency.

[0038] Working principle and usage process: When preparing biochar, the sludge can be injected into the pyrolysis tank 1 through the feed port 17, and the external nitrogen delivery device is connected to the top of the air intake assembly 4 to complete the preparation before the pyrolysis process; When the biochar is pyrolyzed, since the sludge has been put into the pyrolysis tank 1, the motor 6 can be turned on to drive the driving gear 7 at the bottom to rotate. At this time, the driving gear 7 can drive the driven gear ring 8 in the meshing state to rotate, and at the same time drive the main shaft 9 in the middle of the driven gear ring 8 to rotate. At this time, the mixing component 16 on the outer side of the main shaft 9 rotates accordingly to assist in completing the mixing process. Before the pyrolysis process is performed, the external nitrogen can be heated and pressurized and then injected into the interior of the air inlet valve 403. At this time, the piston plate 404 is displaced downward by the pressure, that is, the piston rod 405 is driven to move downward until the piston plate 404 moves to the bottom end of the air pipe 407. At this time, the high-pressure and high-temperature nitrogen can be discharged through the air pipe 407 and introduced into the interior of the pyrolysis tank 1 through the air pipe 407 to heat the internal sludge and discharge the air at the same time, thereby assisting in completing the pyrolysis process. When the main shaft 9 rotates, the movable frame 161 can be driven to rotate synchronously. At this time, the scraper ring 164 located on the outer side of the movable frame 161 rotates synchronously, and at the same time, the plurality of mixing rods 163 can be driven to rotate circumferentially to mix and stir the inside of the pyrolysis tank 1. At the same time, the length of the adjusting rod 162 can be adjusted to complete the height adjustment of the mixing rod 163, thereby assisting in completing the mixing process. At the same time, when nitrogen is input, the downward displacement of the upper extension rod 12 can synchronously drive the movable ring 11 to move downward, and finally drive the scraper ring 164 to move relative to the pyrolysis tank 1, so as to clean the inner wall of the pyrolysis tank 1, automatically scrape off the sludge remaining on the inner wall, and complete the auxiliary cleaning process; At the same time, before the pyrolysis process, when nitrogen is not input into the interior of the air inlet assembly 4, the sealing plug 15 does not seal the bottom end of the frame 2. After the nitrogen is input, the dredging head 14 and the sealing plug 15 automatically descend until the sealing plug 15 completely seals the bottom end of the frame 2 and discharges the air inside the pyrolysis tank 1 until the interior of the pyrolysis tank 1 is filled with high-temperature nitrogen, and then the pyrolysis stirring process is performed; After the pyrolysis is completed, the nitrogen input into the air intake assembly 4 is stopped, and the limit spring 406 is automatically reset, which can drive the piston plate 404 and the piston rod 405 to rise. At this time, the lower extension rod 13, the dredging head 14 and the sealing plug 15 automatically rise, and the biochar after the pyrolysis is completed is discharged through the bottom end of the frame 2, completing the pyrolysis process.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pyrolysis processing device for preparing biochar from sludge, comprising a pyrolysis tank (1), characterized in that: The bottom end of the pyrolysis tank (1) is fixedly connected to a discharge tank (3), the top end of the pyrolysis tank (1) is fixedly installed with an air intake assembly (4), the left and right sides of the top end of the pyrolysis tank (1) are fixedly connected with feed ports (17), a main shaft (9) is movably installed in the middle of the pyrolysis tank (1), the left and right sides of the outer side of the main shaft (9) are provided with clamping grooves (10), the main shaft (9) is movably clamped with a movable ring (11) through the clamping groove (10), the movable ring (11) is displaced up and down relative to the main shaft (9), the outer side of the movable ring (11) is movably sleeved with a mixing assembly (16) located inside the pyrolysis tank (1), an upper extension rod (12) is fixedly installed in the middle of the top end of the movable ring (11), the upper extension rod (12) passes through the top end of the main shaft (9) and is located at the top end of the pyrolysis tank (1), and the top end of the upper extension rod (12) is connected to the bottom end of the air intake assembly (4).

2. The pyrolysis processing device for preparing biochar from sludge according to claim 1, characterized in that: A base (5) is fixedly mounted on the rear side of the top end of the pyrolysis tank (1), a motor (6) is fixedly mounted on the inner side of the base (5), and a driving gear (7) is fixedly mounted on the output end of the motor (6).

3. The pyrolysis processing device for preparing biochar from sludge according to claim 2, characterized in that: A driven gear ring (8) is fixedly sleeved on the outer side surface of the main shaft (9) and located at the top of the pyrolysis tank (1), and a driving gear (7) is fixedly installed on the output end of the motor (6), and the driving gear (7) is meshingly connected with the driven gear ring (8).

4. The pyrolysis processing device for preparing biochar from sludge according to claim 1, characterized in that: The air intake assembly (4) comprises an air storage pipe (402), an outer side surface of the air storage pipe (402) being fixedly sleeved with an extension frame (401), a bottom end of the extension frame (401) being connected to a top end of the pyrolysis tank (1), and a top end of the extension frame (401) being fixedly connected to an air intake valve (403).

5. The pyrolysis processing device for preparing biochar from sludge according to claim 4, characterized in that: The gas storage pipe (402) is movably sleeved with a piston plate (404), the bottom end of the piston plate (404) is fixedly connected with a piston rod (405), and the bottom end of the piston rod (405) passes through the bottom end of the gas storage pipe (402) and is connected to the top end of the upper extension rod (12).

6. The pyrolysis processing device for preparing biochar from sludge according to claim 5, characterized in that: A gas supply pipe (407) is fixedly connected to the front side of the outer side of the extension frame (401) and close to the bottom end. The other end of the gas supply pipe (407) is fixedly connected to the top end of the pyrolysis tank (1). A limit spring (406) is movably sleeved on the outer side of the piston rod (405). The upper and lower ends of the limit spring (406) are respectively connected to the bottom end of the piston plate (404) and the bottom end of the inner cavity of the gas storage pipe (402).

7. The pyrolysis processing device for preparing biochar from sludge according to claim 6, characterized in that: A lower extension rod (13) located inside the frame (2) is fixedly mounted in the middle of the bottom end of the movable ring (11), a dredging head (14) is fixedly mounted at the bottom end of the lower extension rod (13), and a sealing plug (15) is fixedly mounted at the bottom end of the dredging head (14).

8. The pyrolysis processing device for preparing biochar from sludge according to claim 7, characterized in that: When the piston plate (404) is at the lowest point, the dredging head (14) and the sealing plug (15) are also at the lowest point, and the sealing plug (15) completely seals the bottom end of the frame (2).

9. The pyrolysis processing device for preparing biochar from sludge according to claim 1, characterized in that: The mixing assembly (16) comprises a movable frame (161), the movable frame (161) being fixedly sleeved with the outer side surface of the movable ring (11), the upper and lower ends of the movable frame (161) being axially equidistantly mounted with adjusting rods (162), the adjusting ends of the adjusting rods (162) being fixedly mounted with mixing rods (163), the outer side surface of the movable frame (161) being fixedly sleeved with a scraper ring (164), the outer side surface of the scraper ring (164) being in contact with the inner side surface of the pyrolysis tank (1).

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