A pyrolysis processing device for preparing biochar from sludge

Abstract

The present invention belongs to the technical field of biochar preparation, and discloses a pyrolysis processing device for preparing biochar from sludge, which comprises a pyrolysis tank. The bottom end of the pyrolysis tank is fixedly communicated with a discharge tank. The top end of the pyrolysis tank is fixedly installed with an air inlet assembly. Feed inlets are fixedly communicated with both the left and right sides of the top end of the pyrolysis tank. A main shaft is movably installed in the middle of the pyrolysis tank. By utilizing the nitrogen gas input during the pyrolysis process, while heating the sludge with high-temperature and high-pressure nitrogen gas, through the cooperation between the air inlet assembly and the sealing plug, the channel at the bottom end of the rack can be automatically closed to complete the sealing after the nitrogen gas is input. At the same time, after the pyrolysis is completed, the channel at the bottom end of the rack is automatically opened to complete the discharging. Meanwhile, the dredging head automatically rises to dredge the bottom end of the rack, avoiding the problems of the traditional device being unable to automatically seal after nitrogen injection and easy blockage of discharging, and improving the pyrolysis quality.

Description

Technical Field

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

[0002] The preparation of biochar from sludge is a process of converting sludge into biochar through technologies such as pyrolysis, aiming to achieve the resource utilization of sludge and environmental protection. With the acceleration of urbanization, the amount of sewage treatment is increasing continuously, and a large amount of sludge is also generated as a by-product in the sewage treatment process. Traditional sludge treatment methods such as landfill and incineration have disadvantages such as large land occupation and secondary pollution. Therefore, it is imperative to develop an environmentally friendly and efficient sludge treatment method. The emergence of the technology for preparing biochar from sludge provides a new direction for the resource utilization of sludge and has important environmental protection significance and economic value. In the process of preparing biochar from sludge, a pyrolysis processing device is often required for the processing of biochar.

[0003] Conventional pyrolysis processing devices mainly consist of a pyrolysis tank and a mixing device. When processing biochar, sludge is put into the interior of the pyrolysis tank and mixed by the mixing device, and at the same time, it is heated. In order to accelerate the mixing effect, nitrogen is usually injected into the interior of 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.

[0004] At the same time, during the pyrolysis processing, due to the mixing of the mixing device and the adhesion of the sludge, a certain amount of sludge will adhere to the interior of the pyrolysis tank. Due to the heating, the moisture of the sludge is evaporated, resulting in partial sludge being solidified in the interior of the pyrolysis tank, which will not only lead to a decrease in pyrolysis quality but also affect the overall pyrolysis efficiency, and improvement is urgently needed. Summary of the Invention

[0005] The purpose 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 art.

[0006] To achieve the above object, the present invention provides the following technical solution: A pyrolysis processing device for preparing biochar from sludge, comprising a pyrolysis tank, the bottom end of the pyrolysis tank is fixedly communicated with a discharge tank, the top end of the pyrolysis tank is fixedly installed with an air inlet assembly, the left and right sides of the top end of the pyrolysis tank are both fixedly communicated with a feed port, a main shaft is movably installed in the middle of the pyrolysis tank, clamping grooves are formed on the left and right sides of the outer side of the main shaft, the main shaft is movably clamped with a movable ring through the clamping grooves, the movable ring moves up and down relative to the main shaft, a mixing assembly located inside the pyrolysis tank is movably sleeved on the outer side of the movable ring, a upper extension rod is fixedly installed in the middle of the top end of the movable ring, the upper extension rod penetrates through the top end of the main shaft and is located at the top end position of the pyrolysis tank, and the top end of the upper extension rod is connected with the bottom end of the air inlet assembly.

[0007] When preparing biochar, the sludge can be injected into the inside of the pyrolysis tank through the feed port, and at the same time, an external nitrogen delivery device is connected to the top end of the air inlet assembly to complete the preparation before pyrolysis processing.

[0008] As a further technical solution of the present invention, a machine base is fixedly installed on the rear side of the top end of the pyrolysis tank, a motor is fixedly installed on the inner side of the machine base, and a driving gear is fixedly installed on the output end of the motor.

[0009] 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 end position of the pyrolysis tank, a driving gear is fixedly installed on the output end of the motor, and the driving gear is meshed with the driven gear ring.

[0010] When pyrolyzing biochar, since the sludge has been put into the pyrolysis tank, the motor can be started at this time to drive the driving gear at the bottom end to rotate. At this time, the driving gear can drive the driven gear ring in the meshed 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 assembly on the outer side of the main shaft rotates accordingly to assist in completing the mixing process.

[0011] As a further technical solution of the present invention, the air inlet assembly includes a gas storage pipe, an extension frame is fixedly sleeved on the outer side of the gas storage pipe, the bottom end of the extension frame is connected with the top end of the pyrolysis tank, and an air inlet valve is fixedly communicated with the top end of the extension frame.

[0012] As a further technical solution of the present invention, a piston plate is movably sleeved inside the gas storage pipe, a piston rod is fixedly connected to the bottom end of the piston plate, and the bottom end of the piston rod penetrates through the bottom end of the gas storage pipe and is connected with the top end of the upper extension rod.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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;

[0018] 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.

[0019] 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.

[0020] As a further technical solution of the present invention, the mixing assembly includes a movable frame, the movable frame is fixedly sleeved on the outer side surface of the movable ring, adjusting rods are axially and equally spacedly installed at both the upper and lower ends of the movable frame, mixing rods are fixedly installed at the adjusting ends of the adjusting rods, a scraping ring is fixedly sleeved on the outer side surface of the movable frame, and the outer side surface of the scraping ring is in contact with the inner side surface of the pyrolysis tank.

[0021] When the main shaft rotates, it can drive the movable frame to rotate synchronously. At this time, the scraping ring located on the outer side surface of the movable frame rotates synchronously, and at the same time, it can drive a plurality of 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.

[0022] At the same time, when nitrogen is input, due to the downward displacement of the upper extension rod, it can synchronously drive the movable ring to move downward, and finally drive the scraping ring to displace relative to the pyrolysis tank, so as to clean the inner wall of the pyrolysis tank, automatically scrape the sludge remaining on the inner wall, and complete the auxiliary cleaning process.

[0023] By reusing the nitrogen input during the pyrolysis process, while automatically sealing during pyrolysis, it can automatically scrape the inner wall of the pyrolysis tank, automatically remove the sludge remaining on the inner wall of the pyrolysis tank, avoid the drying phenomenon caused by long-term adhesion of the sludge, and the entire cleaning process is automatically completed along with the pyrolysis without manual auxiliary cleaning, effectively improving the pyrolysis quality and at the same time improving the overall pyrolysis efficiency.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) By utilizing the nitrogen input during the pyrolysis process, while heating the sludge with high-temperature and high-pressure nitrogen, through the cooperation between the air inlet assembly and the sealing plug, the channel at the bottom end of the frame can be automatically closed to complete the sealing after the nitrogen is input. At the same time, after the pyrolysis is completed, the channel at the bottom end of the frame is automatically opened to complete the discharging, and at the same time, the dredging head automatically rises to dredge the bottom end of the frame, avoiding the problems that the traditional device cannot be automatically sealed after nitrogen injection and the discharging is easily blocked, and improving the pyrolysis quality.

[0026] (2) By reusing the nitrogen input during the pyrolysis process, while automatically sealing during pyrolysis, it can automatically scrape the inner wall of the pyrolysis tank, automatically remove the sludge remaining on the inner wall of the pyrolysis tank, avoid the drying phenomenon caused by long-term adhesion of the sludge, and the entire cleaning process is automatically completed along with the pyrolysis without manual auxiliary cleaning, effectively improving the pyrolysis quality and at the same time improving the overall pyrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the cooperation of the pyrolysis tank, the discharge tank and the air intake component structure of the present invention;

[0029] Figure 3 It is a separate schematic diagram of the air intake component structure of the present invention;

[0030] Figure 4 It is a separate sectional view schematic diagram of the internal structure of the air intake component of the present invention;

[0031] Figure 5 It is a sectional view schematic diagram of the internal structures of the pyrolysis tank and the discharge tank of the present invention;

[0032] Figure 6 It is a schematic diagram of the cooperation of the main shaft and the mixing component structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the cooperation of the main shaft and the movable ring structure of the present invention;

[0034] Figure 8 It is a separate schematic diagram of the mixing component structure of the present invention.

[0035] In the figure: 1. Pyrolysis tank; 2. Frame; 3. Discharge tank; 4. Air intake component; 401. Extension frame; 402. Gas 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. Card slot; 11. Movable ring; 12. Upper extension rod; 13. Lower extension rod; 14. Unblocking head; 15. Sealing plug; 16. Mixing component; 161. Movable frame; 162. Adjusting rod; 163. Mixing rod; 164. Scraping ring; 17. Feed inlet. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Such as 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 communicated with a discharge tank 3. The top end of the pyrolysis tank 1 is fixedly installed with an air inlet assembly 4. The left and right sides of the top end of the pyrolysis tank 1 are both fixedly communicated with a feed inlet 17. A main shaft 9 is movably installed in the middle of the pyrolysis tank 1. Slots 10 are opened on the left and right sides of the outer surface of the main shaft 9. The main shaft 9 is movably clamped with a movable ring 11 through the slots 10. The movable ring 11 moves up and down relative to the main shaft 9. A mixing assembly 16 located inside the pyrolysis tank 1 is movably sleeved on the outer surface of the movable ring 11. The middle of the top end of the movable ring 11 is fixedly installed with an upper extension rod 12. The upper extension rod 12 penetrates through the top end of the main shaft 9 and is located at the top end of the pyrolysis tank 1. The top end of the upper extension rod 12 is connected to the bottom end of the air inlet assembly 4.

[0038] When preparing biochar, the sludge can be injected into the interior of the pyrolysis tank 1 through the feed inlet 17. At the same time, an external nitrogen delivery device is connected to the top end of the air inlet assembly 4 to complete the preparation before pyrolysis processing.

[0039] As Figure 1 and Figure 4 As shown, a machine base 5 is fixedly installed at the rear side of the top end of the pyrolysis tank 1. A motor 6 is fixedly installed on the inner side surface of the machine base 5. The output end of the motor 6 is fixedly installed with a driving gear 7. A driven gear ring 8 is fixedly sleeved on the outer surface of the main shaft 9 and located at the top end of the pyrolysis tank 1. The output end of the motor 6 is fixedly installed with a driving gear 7. The driving gear 7 is meshed with the driven gear ring 8.

[0040] When pyrolyzing biochar, since the sludge has been put into the interior of the pyrolysis tank 1, the motor 6 can be started at this time to drive the driving gear 7 at the bottom end to rotate. At this time, the driving gear 7 can drive the driven gear ring 8 in the meshed 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 assembly 16 on the outer surface of the main shaft 9 rotates accordingly to assist in completing the mixing process.

[0041] As Figure 1 and Figure 2 and Figure 3 and Figure 4As shown in the figure, the intake assembly 4 includes a gas storage pipe 402. An extension bracket 401 is fixedly sleeved on the outer side surface of the gas storage pipe 402. The bottom end of the extension bracket 401 is connected to the top end of the pyrolysis tank 1. The top end of the extension bracket 401 is fixedly communicated with an intake valve 403. A piston plate 404 is movably sleeved inside the gas storage pipe 402. The bottom end of the piston plate 404 is fixedly connected to a piston rod 405. The bottom end of the piston rod 405 penetrates through the bottom end of the gas storage pipe 402 and is connected to the top end of the upper extension rod 12. An air delivery pipe 407 is fixedly communicated at the front side and near the bottom end of the outer side surface of the extension bracket 401. The other end of the air delivery pipe 407 is fixedly communicated with the top end of the pyrolysis tank 1. A limiting spring 406 is movably sleeved on the outer side surface of the piston rod 405. The upper and lower ends of the limiting 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.

[0042] Before pyrolysis processing, external nitrogen can be heated and pressurized and then injected into the intake valve 403. At this time, the piston plate 404 is displaced downward under the pressure, that is, driving the piston rod 405 to displace downward. When the piston plate 404 is displaced to the bottom end of the air delivery pipe 407, at this time, the high-pressure and high-temperature nitrogen can be led out through the air delivery pipe 407 and introduced into the pyrolysis tank 1 through the air delivery pipe 407 to heat the sludge inside and discharge the air at the same time, assisting in completing the pyrolysis process.

[0043] As Figure 5 and Figure 6 and Figure 7 As shown in the figure, 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. 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.

[0044] Embodiment: At the same time, before pyrolysis processing, when nitrogen is not input into the intake assembly 4, at this time, the sealing plug 15 does not seal the bottom end of the frame 2. When nitrogen is input, at this time, 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 inside of the pyrolysis tank 1 is filled with high-temperature nitrogen, the pyrolysis stirring process is carried out;

[0045] After pyrolysis is completed, by stopping the input of nitrogen into the intake assembly 4, at this time, the limiting spring 406 automatically resets, 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 pyrolysis is discharged through the bottom end of the frame 2, completing the pyrolysis process.

[0046] By utilizing the nitrogen gas input during the pyrolysis process, while heating the sludge with high-temperature and high-pressure nitrogen gas, through the cooperation between the air inlet assembly 4 and the sealing plug 15, the channel at the bottom of the frame 2 can be automatically closed to complete the sealing after the nitrogen gas 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 discharging. Meanwhile, the dredging head 14 can automatically rise to dredge the bottom of the frame 2, avoiding the problems that the traditional device cannot be automatically sealed after nitrogen injection and the discharging is prone to blockage, and improving the pyrolysis quality.

[0047] As Figure 1 and Figure 5 as well as Figure 6 and Figure 8 As shown, the mixing assembly 16 includes a movable frame 161. The movable frame 161 is fixedly sleeved on the outer side of the movable ring 11. Adjusting rods 162 are axially and equidistantly installed at both the upper and lower ends of the movable frame 161. Mixing rods 163 are fixedly installed at the adjusting ends of the adjusting rods 162. A scraping ring 164 is fixedly sleeved on the outer side of the movable frame 161. The outer side of the scraping ring 164 is in contact with the inner side of the pyrolysis tank 1.

[0048] Embodiment: When the main shaft 9 rotates, it can drive the movable frame 161 to rotate synchronously. At this time, the scraping ring 164 located on the outer side of the movable frame 161 rotates synchronously, and at the same time, it can drive a plurality of mixing rods 163 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 to assist in completing the mixing process;

[0049] At the same time, when nitrogen gas is input, due to the downward displacement of the upper extension rod 12, it can synchronously drive the movable ring 11 to move downward, and finally drive the scraping ring 164 to displace 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.

[0050] By reusing the nitrogen gas input during the pyrolysis process, while automatically sealing during pyrolysis, the inner wall of the pyrolysis tank 1 can be automatically scraped, and the sludge remaining on the inner wall of the pyrolysis tank 1 can be automatically removed, avoiding the drying phenomenon caused by long-term adhesion of the sludge. The entire cleaning process is automatically completed along with the pyrolysis, without manual auxiliary cleaning, effectively improving the pyrolysis quality and at the same time improving the overall pyrolysis efficiency.

[0051] Working principle and usage process:

[0052] When preparing biochar, the sludge can be injected into the inside of the pyrolysis tank 1 through the feed port 17. At the same time, an external nitrogen gas delivery device is connected to the top of the air inlet assembly 4 to complete the preparation before pyrolysis processing;

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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;

[0057] 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;

[0058] 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.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and 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 and communicated with a discharge tank (3). The top end of the pyrolysis tank (1) is fixedly installed with an air inlet assembly (4). The left and right sides of the top end of the pyrolysis tank (1) are fixedly connected and communicated with a feed inlet (17). A main shaft (9) is movably installed in the middle of the pyrolysis tank (1). Slots (10) are formed on the left and right sides of the outer side of the main shaft (9). The main shaft (9) is movably clamped with a movable ring (11) through the slots (10). The movable ring (11) moves up and down relative to the main shaft (9). A mixing assembly (16) located inside the pyrolysis tank (1) is movably sleeved on the outer side of the movable ring (11). The middle of the top end of the movable ring (11) is fixedly installed with an upper extension rod (12). The upper extension rod (12) penetrates through the top end of the main shaft (9) and is located at the top end of the pyrolysis tank (1). The top end of the upper extension rod (12) is connected to the bottom end of the air inlet assembly (4); The air inlet assembly (4) includes an air storage pipe (402). An extension bracket (401) is fixedly sleeved on the outer side of the air storage pipe (402). The bottom end of the extension bracket (401) is connected to the top end of the pyrolysis tank (1). An air inlet valve (403) is fixedly connected and communicated with the top end of the extension bracket (401); A piston plate (404) is movably sleeved inside the air storage pipe (402). A piston rod (405) is fixedly connected to the bottom end of the piston plate (404). The bottom end of the piston rod (405) penetrates through the bottom end of the air storage pipe (402) and is connected to the top end of the upper extension rod (12); An air delivery pipe (407) is fixedly connected and communicated with the front side of the outer side of the extension bracket (401) and near the bottom end. The other end of the air delivery pipe (407) is fixedly connected to the top end of the pyrolysis tank (1). A limiting spring (406) is movably sleeved on the outer side of the piston rod (405). The upper and lower ends of the limiting 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); The middle of the bottom end of the movable ring (11) is fixedly installed with a lower extension rod (13) located inside the frame (2). A dredging head (14) is fixedly installed at the bottom end of the lower extension rod (13). 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).

2. The pyrolysis processing device for preparing biochar from sludge according to claim 1, wherein: A machine base (5) is fixedly installed at the rear side of the top end of the pyrolysis tank (1). A motor (6) is fixedly installed on the inner side of the machine base (5). A driving gear (7) is fixedly installed at the output end of the motor (6).

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

4. The pyrolysis processing device for preparing biochar from sludge according to claim 1, wherein: The mixing component (16) includes a movable frame (161), the movable frame (161) is fixedly sleeved on the outer side surface of the movable ring (11), adjusting rods (162) are axially and equidistantly installed at both the upper and lower ends of the movable frame (161), mixing rods (163) are fixedly installed at the adjusting ends of the adjusting rods (162), a scraping ring (164) is fixedly sleeved on the outer side surface of the movable frame (161), and the outer side surface of the scraping ring (164) is in contact with the inner side surface of the pyrolysis tank (1).

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