A pyrolysis kiln

Abstract

This invention discloses a pyrolysis kiln, belonging to the field of pyrolysis kilns. It includes a first heating assembly and a second heating assembly. The first heating assembly includes an inner cylinder and an outer cylinder, with the outer cylinder sleeved outside the inner cylinder. A first heating channel is formed between the inner and outer cylinders, used to introduce flue gas to heat the material in the inner cylinder. The second heating assembly includes a heating tube, with both ends connected to the inner wall of the inner cylinder. A second heating channel is provided inside the heating tube. The inner cylinder has a first through hole connecting one end of the first heating channel and the second heating channel, and a second through hole connecting the other end of the first heating channel and the second heating channel. The two ends of the heating tube are spaced apart along the axial direction of the inner cylinder. By using heating tubes, a portion of hot flue gas is introduced into the inner cylinder to fully heat the material, increasing the heat exchange area while strengthening the stirring of the material, improving heat exchange efficiency, and reducing energy consumption.

Description

Technical Field

[0001] This invention relates to the field of pyrolysis kiln technology, and particularly to a pyrolysis kiln. Background Technology

[0002] A pyrolysis kiln is a device that uses heat to decompose organic matter under anaerobic conditions. A typical indirectly heated rotary pyrolysis kiln consists of an inner cylinder and an outer cylinder, with a flue gas passage formed between them. One end of the flue gas passage is the flue gas inlet, and the other end is the flue gas outlet. Hot flue gas enters from the flue gas inlet, passes through the flue gas passage, and exits from the flue gas outlet. One end of the inner cylinder is the material inlet, and the other end is the material outlet. Material enters from the material inlet and exits from the material outlet. This type of rotary pyrolysis kiln has relatively low overall heat transfer efficiency and high energy consumption. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pyrolysis kiln that solves the problems of low overall heat transfer efficiency and high energy consumption in existing rotary pyrolysis kilns.

[0004] A pyrolysis kiln according to an embodiment of the present invention includes:

[0005] The first heating component includes an inner cylinder and an outer cylinder. The outer cylinder is sleeved on the outside of the inner cylinder, and a first heating channel is formed between the inner cylinder and the outer cylinder. The first heating channel is used to introduce flue gas to heat the material in the inner cylinder.

[0006] The second heating component includes a heating tube, both ends of which are connected to the inner wall of the inner cylinder. A second heating channel is provided inside the heating tube. A first through hole is provided on the inner cylinder, connecting one end of the first heating channel and the second heating channel. A second through hole is provided on the inner cylinder, connecting the other end of the first heating channel and the second heating channel. The two ends of the heating tube are spaced apart along the axial direction of the inner cylinder.

[0007] A pyrolysis kiln according to an embodiment of the present invention has at least the following beneficial effects:

[0008] By installing heating pipes, a portion of hot flue gas is introduced into the inner cylinder to fully heat the material. This increases the heat exchange area and strengthens the stirring of the material, thereby improving heat exchange efficiency and reducing energy consumption.

[0009] According to some embodiments of the present invention, the heating tube includes a straight pipe section and two bent pipe sections connected to both ends of the straight pipe section. The two bent pipe sections are connected to the inner wall of the inner cylinder. The straight pipe section is spaced apart from the inner wall of the inner cylinder, and the axial direction of the straight pipe section is consistent with the axial direction of the inner cylinder.

[0010] According to some embodiments of the present invention, a plurality of heating tubes are provided, and the plurality of heating tubes are arranged in a ring array around the axial direction of the inner cylinder. A plurality of first through holes and a plurality of second through holes are provided correspondingly. The centers of the plurality of first through holes are located on the same cross-section of the inner cylinder, and the centers of the plurality of second through holes are located on the same cross-section of the inner cylinder.

[0011] According to some embodiments of the present invention, the pyrolysis kiln further includes a first baffle assembly and a second baffle assembly for slowing down the flue gas velocity in the first heating channel. The first baffle assembly and the second baffle assembly are disposed in the first heating channel and located between the first through hole and the second through hole. The first baffle assembly is disposed close to the first through hole and is provided with a first gas passage for flue gas to pass through. The second baffle assembly is disposed close to the second through hole and is provided with a second gas passage for flue gas to pass through.

[0012] According to some embodiments of the present invention, the first baffle assembly includes a first baffle plate and a second baffle plate. The first baffle plate is provided with a third through hole, and the second baffle plate is provided with a fourth through hole. The first baffle plate connects the inner cylinder and the outer cylinder. The second baffle plate is rotatably disposed relative to the first baffle plate. When the third through hole and the fourth through hole overlap, the communication between the third through hole and the fourth through hole forms the first air passage. When the third through hole and the fourth through hole are misaligned, the first air passage is closed.

[0013] According to some embodiments of the present invention, an annular protrusion is provided on the inner ring of the first baffle, and the second baffle is sleeved on the annular protrusion and rotatably connected to the annular protrusion.

[0014] According to some embodiments of the present invention, the first baffle is arranged in a ring shape, and multiple third through holes are provided, wherein the distance between two adjacent third through holes is greater than the diameter of the third through hole;

[0015] The second baffle is arranged in a ring shape, and there are multiple fourth through holes. The distance between two adjacent fourth through holes is greater than the diameter of the fourth through hole. The diameter of the fourth through hole is the same as the diameter of the third through hole, and the number of fourth through holes is the same as the number of third through holes.

[0016] When one of the third through holes and one of the fourth through holes completely coincide, multiple third through holes and multiple fourth through holes completely coincide; when one of the third through holes and one of the fourth through holes completely offset, multiple third through holes and multiple fourth through holes completely offset.

[0017] According to some embodiments of the present invention, the first flow-blocking assembly further includes a driving assembly, which is mounted on the outer cylinder and is connected to the second flow-blocking plate in a transmission manner. The driving assembly is used to drive the second flow-blocking plate to rotate.

[0018] According to some embodiments of the present invention, the outer edge of the second baffle is provided with teeth, the driving assembly includes a drive motor, the output shaft of the drive motor is connected to a gear, the gear meshes with the teeth, and the drive motor is used to drive the second baffle to rotate through the gear and the teeth.

[0019] According to some embodiments of the present invention, the teeth are arranged in an arc shape, and the drive motor drives the gear to switch between clockwise rotation and counterclockwise rotation.

[0020] According to some embodiments of the present invention, the pyrolysis kiln further includes a cleaning component disposed within the first heating channel. The cleaning component includes a plurality of cleaning rods connected to the inner cylinder. Each cleaning rod is provided with a brush, which abuts against the side of the second baffle plate near the first through hole. The first baffle plate is disposed on the side of the second baffle plate away from the first through hole.

[0021] According to some embodiments of the present invention, the cleaning assembly includes a baffle ring, a plurality of the cleaning rods are connected to the baffle ring, the baffle ring is detachably connected to the annular protrusion, and the outer diameter of the baffle ring is larger than the inner diameter of the second baffle plate.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the pyrolysis kiln according to an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of the pyrolysis kiln according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the inner cylinder and the second heating assembly of the pyrolysis kiln according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the first baffle assembly of the pyrolysis furnace in an embodiment of the present invention after the driving assembly is removed;

[0028] Figure 5 This is a schematic diagram of the structure of the first baffle plate of the pyrolysis kiln in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the second baffle plate of the pyrolysis kiln in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the cleaning component of the pyrolysis kiln according to an embodiment of the present invention.

[0031] Icon labels:

[0032] 100. First heating component; 110. Inner cylinder; 111. First through hole; 112. Second through hole; 120. Outer cylinder; 130. First heating channel;

[0033] 200. Second heating assembly; 210. Heating tube; 211. Second heating channel; 212. Straight pipe section; 213. Bend section;

[0034] 300, First baffle assembly; 310, First baffle plate; 311, Third through hole; 312, Annular protrusion; 320, Second baffle plate; 321, Fourth through hole; 322, Tooth; 330, Drive assembly; 331, Gear;

[0035] 400. Second flow baffle assembly;

[0036] 500. Cleaning components; 510. Cleaning rod; 520. Cleaning brush; 530. Retaining ring. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Please see Figure 1 , Figure 2 and Figure 3 According to an embodiment of the present invention, a pyrolysis kiln includes a first heating assembly 100 and a second heating assembly 200. The first heating assembly 100 includes an inner cylinder 110 and an outer cylinder 120, with the outer cylinder 120 sleeved outside the inner cylinder 110. A first heating channel 130 is formed between the inner cylinder 110 and the outer cylinder 120, and the first heating channel 130 is used to introduce flue gas to heat the material in the inner cylinder 110. The second heating assembly 200 includes a heating tube 210, with both ends of the heating tube 210 connected to the inner wall of the inner cylinder 110. A second heating channel 211 is provided inside the heating tube 210. A first through hole 111 and a second through hole 112 are provided on the inner cylinder 110. The first through hole 111 connects to one end of the first heating channel 130 and the second heating channel 211, and the second through hole 112 connects to the other end of the first heating channel 130 and the second heating channel 211. The two ends of the heating tube 210 are spaced apart along the axial direction of the inner cylinder 110.

[0041] One end of the first heating channel 130 is a flue gas inlet, and the other end is a flue gas outlet. Hot flue gas enters from the flue gas inlet, passes through the first heating channel 130, and exits from the flue gas outlet. One end of the inner cylinder 110 is a material inlet, and the other end is a material outlet. The material inlet is close to the flue gas outlet, and the material outlet is close to the flue gas inlet. Material enters from the material inlet and exits from the material outlet. By setting up heating pipes 210, a portion of hot flue gas is introduced into the inner cylinder 110 to fully heat the material, increasing the heat exchange area while also enhancing the stirring of the material, improving heat exchange efficiency, and reducing energy consumption.

[0042] In some embodiments, see Figure 1 , Figure 2 and Figure 3The heating tube 210 includes a straight tube section 212 and two bent tube sections 213. The two bent tube sections 213 are connected to both ends of the straight tube section 212 and are connected to the inner wall of the inner cylinder 110. The straight tube section 212 is spaced apart from the inner wall of the inner cylinder 110, and the axial direction of the straight tube section 212 is consistent with the axial direction of the inner cylinder 110. The straight tube section 212 is connected to the inside of the inner cylinder 110 through the two bent tube sections 213. The heating tube 210 has a simple overall structure, is easy to manufacture, increases the heat exchange area, enhances the stirring of materials, and improves the heat exchange efficiency.

[0043] In some embodiments, see Figure 1 , Figure 2 and Figure 3 Multiple heating tubes 210 are arranged in a ring array around the axial direction of the inner cylinder 110. Multiple first through holes 111 and second through holes 112 are also provided, with the centers of the multiple first through holes 111 and the centers of the multiple second through holes 112 located on the same cross-section of the inner cylinder 110. The arrangement of multiple heating tubes 210 inside the inner cylinder 110 increases the heat exchange area and enhances the stirring of the material, thus improving heat exchange efficiency. The ring array arrangement of the multiple heating tubes 210 around the axial direction of the inner cylinder 110 and the centers of the multiple first through holes 111 located on the same cross-section of the inner cylinder 110 ensure uniform heating of each heating tube 210.

[0044] In some embodiments, see Figure 1 and Figure 2 The pyrolysis kiln also includes a first baffle assembly 300 and a second baffle assembly 400, which are used to reduce the flue gas velocity in the first heating channel 130. The first baffle assembly 300 and the second baffle assembly 400 are disposed within the first heating channel 130, between a first through hole 111 and a second through hole 112. The first baffle assembly 300 is positioned closer to the first through hole 111, and the second baffle assembly 400 is positioned closer to the second through hole 112. The first baffle assembly 300 has a first air passage for flue gas to pass through, and the second baffle assembly 400 has a second air passage for flue gas to pass through.

[0045] Hot flue gas enters from the flue gas inlet, passes through the first heating channel 130, and exits from the flue gas outlet. A first baffle assembly 300 and a second baffle assembly 400 are installed in the first heating channel 130 to slow down the flue gas flow rate in the first heating channel 130. This ensures that the hot flue gas can be diverted into the second heating channel 211, introducing a portion of the hot flue gas into the inner cylinder 110 to fully heat the material. This increases the heat exchange area and strengthens the stirring of the material, improving heat exchange efficiency and reducing energy consumption.

[0046] In some embodiments, see Figure 2 and Figure 4 The first flow-blocking assembly 300 includes a first flow-blocking plate 310 and a second flow-blocking plate 320, see reference. Figure 5 The first baffle plate 310 is provided with a third through hole 311, and the first baffle plate 310 connects the inner cylinder 110 and the outer cylinder 120. (See reference...) Figure 6 The second baffle plate 320 is provided with a fourth through hole 321, and the second baffle plate 320 is rotatably disposed relative to the first baffle plate 310. When the third through hole 311 and the fourth through hole 321 overlap, the connection between the third through hole 311 and the fourth through hole 321 forms a first air passage; when the third through hole 311 and the fourth through hole 321 are misaligned, the first air passage is closed. The first baffle plate 310 is fixedly connected in the first heating channel 130, and the second baffle plate 320 is rotatably disposed, so that the area of ​​the overlapping part between the third through hole 311 and the fourth through hole 321 can be adjusted, the cross-sectional area of ​​the first air passage can be adjusted, and thus the flue gas passing speed of the first heating channel 130 can be adjusted.

[0047] The structure of the second flow-blocking component 400 is the same as that of the first flow-blocking component 300.

[0048] In some embodiments, see Figure 4 and Figure 5 The first baffle plate 310 has an annular protrusion 312 on its inner ring, and the second baffle plate 320 is sleeved on the annular protrusion 312 and rotatably connected to the annular protrusion 312. The first baffle plate 310 can be welded to the outer wall of the inner cylinder 110, and the second baffle plate 320 is rotatably connected to the annular protrusion 312, which can reduce the friction between the second baffle plate 320 and the inner cylinder 110 and avoid wear of the inner cylinder 110.

[0049] In some embodiments, see Figure 4 , Figure 5 and Figure 6 The first baffle plate 310 is arranged in a ring shape, and multiple third through holes 311 are provided. The distance between two adjacent third through holes 311 is greater than the diameter of the third through hole 311. The second baffle plate 320 is arranged in a ring shape, and multiple fourth through holes 321 are provided. The distance between two adjacent fourth through holes 321 is greater than the diameter of the fourth through hole 321. The diameter of the fourth through hole 321 is the same as the diameter of the third through hole 311, and the number of fourth through holes 321 is the same as the number of third through holes 311.

[0050] When a third through hole 311 and a fourth through hole 321 completely coincide, multiple third through holes 311 and multiple fourth through holes 321 completely coincide; when a third through hole 311 and a fourth through hole 321 completely offset, multiple third through holes 311 and multiple fourth through holes 321 completely offset.

[0051] The third through hole 311 and the fourth through hole 321 are correspondingly arranged so that when the second baffle plate 320 is rotated, the overlapping area between all the third through holes 311 and all the fourth through holes 321 can be adjusted, so that the total cross-sectional area of ​​the first air passage can change linearly. The first baffle plate 310 and the second baffle plate 320 can be connected together first, and then the third through hole 311 and the fourth through hole 321 can be machined together, which is convenient for processing.

[0052] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The first baffle assembly 300 also includes a drive assembly 330, which is mounted on the outer cylinder 120 and is connected to the second baffle plate 320 via a transmission connection. The drive assembly 330 is used to drive the second baffle plate 320 to rotate. The drive assembly 330 can be a servo motor, which drives the second baffle plate 320 to rotate, thereby adjusting the overlapping area between the third through hole 311 and the fourth through hole 321, and adjusting the flue gas velocity in the first heating channel 130.

[0053] In some embodiments, see Figure 2 , Figure 4 and Figure 6 The second baffle plate 320 has teeth 322 on its outer edge. The drive assembly 330 includes a drive motor, and the output shaft of the drive motor is connected to a gear 331. The gear 331 meshes with the teeth 322. The drive motor drives the second baffle plate 320 to rotate via the gear 331 and the teeth 322. The drive motor can be a servo motor. The gear 331 meshes with the teeth 322 on the second baffle plate 320, and the drive motor drives the second baffle plate 320 to rotate via the gear 331, thereby adjusting the overlapping area between the third through hole 311 and the fourth through hole 321, and adjusting the flue gas velocity in the first heating channel 130.

[0054] In some embodiments, see Figure 2 , Figure 4 and Figure 6The toothed portion 322 is arc-shaped, and the drive motor drives the gear 331 to switch between clockwise and counterclockwise rotation. The overall length of the toothed portion 322 is relatively short, making it easy to manufacture and saving costs. When the drive motor drives the gear 331 to rotate clockwise, the corresponding second baffle plate 320 rotates counterclockwise. After the gear 331 abuts against one end of the toothed portion 322, the drive motor then drives the gear 331 to rotate counterclockwise again, corresponding to the second baffle plate 320 rotating clockwise. The gear 331 is always meshed with the toothed portion 322.

[0055] In some embodiments, see Figure 2 , Figure 4 and Figure 7 The pyrolysis kiln also includes a cleaning component 500, which is located within the first heating channel 130. The cleaning component 500 includes multiple cleaning rods 510 connected to the inner cylinder 110. Each cleaning rod 510 is equipped with a brush 520, which abuts against the side of the second baffle plate 320 near the first through hole 111. The first baffle plate 310 is located on the side of the second baffle plate 320 away from the first through hole 111. When the first through hole 111 is the flue gas inlet, the flue gas first contacts the second baffle plate 320 and then passes through the first air passage. After prolonged use, dust easily accumulates on the second baffle plate 320. The second baffle plate 320 can be rotated by a drive motor. When the second baffle plate 320 rotates, the brushes 520 on the cleaning rods 510 can sweep and clean the second baffle plate 320.

[0056] Both the first flow-blocking assembly 300 and the second flow-blocking assembly 400 are equipped with a cleaning assembly 500. The cleaning assembly 500 is located on the side of the first flow-blocking assembly 300 near the first through hole 111, and the cleaning assembly 500 is located on the side of the second flow-blocking assembly 400 near the second through hole 112.

[0057] In some embodiments, see Figure 4 , Figure 5 and Figure 7 The cleaning assembly 500 includes a retaining ring 530, with multiple cleaning rods 510 connected to the retaining ring 530. The retaining ring 530 is detachably connected to an annular protrusion 312, and the outer diameter of the retaining ring 530 is larger than the inner diameter of the second baffle 320. The first baffle 310 is welded to the inner cylinder 110, and the second baffle 320 is fitted onto the annular protrusion 312. The retaining ring 530 is detachably connected to the annular protrusion 312 by bolts, and the retaining ring 530 can restrain the second baffle 320 on the annular protrusion 312, preventing the second baffle 320 from falling off.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pyrolysis kiln, characterized in that, include: The first heating component includes an inner cylinder and an outer cylinder. The outer cylinder is sleeved on the outside of the inner cylinder, and a first heating channel is formed between the inner cylinder and the outer cylinder. The first heating channel is used to introduce flue gas to heat the material in the inner cylinder. The second heating component includes a heating tube, both ends of which are connected to the inner wall of the inner cylinder. A second heating channel is provided inside the heating tube. A first through hole is provided on the inner cylinder, connecting one end of the first heating channel and the second heating channel. A second through hole is provided on the inner cylinder, connecting the other end of the first heating channel and the second heating channel. The two ends of the heating tube are spaced apart along the axial direction of the inner cylinder. It also includes a first baffle assembly and a second baffle assembly for slowing down the flue gas flow rate in the first heating channel. The first baffle assembly and the second baffle assembly are disposed in the first heating channel and located between the first through hole and the second through hole. The first baffle assembly is disposed close to the first through hole and is provided with a first air passage for flue gas to pass through. The second baffle assembly is disposed close to the second through hole and is provided with a second air passage for flue gas to pass through. The first baffle assembly includes a first baffle plate and a second baffle plate. The first baffle plate is provided with a third through hole, and the second baffle plate is provided with a fourth through hole. The first baffle plate connects the inner cylinder and the outer cylinder. The second baffle plate is rotatably disposed relative to the first baffle plate. When the third through hole and the fourth through hole overlap, the connection between the third through hole and the fourth through hole forms the first air passage. When the third through hole and the fourth through hole are misaligned, the first air passage is closed. It also includes a cleaning component, which is disposed within the first heating channel. The cleaning component includes multiple cleaning rods connected to the inner cylinder. Each cleaning rod is equipped with a brush, which abuts against the side of the second baffle plate near the first through hole. The first baffle plate is disposed on the side of the second baffle plate away from the first through hole.

2. The pyrolysis kiln according to claim 1, characterized in that, The heating tube includes a straight pipe section and two bent pipe sections connected to both ends of the straight pipe section. The two bent pipe sections are connected to the inner wall of the inner cylinder. The straight pipe section is spaced apart from the inner wall of the inner cylinder, and the axial direction of the straight pipe section is consistent with the axial direction of the inner cylinder.

3. A pyrolysis kiln according to claim 1, characterized in that, The heating tubes are provided in a plurality of manner, and the plurality of heating tubes are arranged in a ring array around the axial direction of the inner cylinder. The first through hole and the second through hole are provided in a plurality of manner, and the centers of the plurality of first through holes are located on the same cross-section of the inner cylinder, and the centers of the plurality of second through holes are located on the same cross-section of the inner cylinder.

4. A pyrolysis kiln according to claim 1, characterized in that, The first baffle is arranged in a ring shape, and multiple third through holes are provided, with the distance between two adjacent third through holes being greater than the diameter of the third through hole; The second baffle is arranged in a ring shape, and there are multiple fourth through holes. The distance between two adjacent fourth through holes is greater than the diameter of the fourth through hole. The diameter of the fourth through hole is the same as the diameter of the third through hole, and the number of fourth through holes is the same as the number of third through holes. When one of the third through holes and one of the fourth through holes completely coincide, multiple third through holes and multiple fourth through holes completely coincide; when one of the third through holes and one of the fourth through holes completely offset, multiple third through holes and multiple fourth through holes completely offset.

5. A pyrolysis kiln according to claim 1, characterized in that, The first flow-blocking assembly further includes a driving assembly, which is mounted on the outer cylinder and is connected to the second flow-blocking plate in a transmission manner. The driving assembly is used to drive the second flow-blocking plate to rotate.

6. A pyrolysis kiln according to claim 5, characterized in that, The outer edge of the second baffle is provided with teeth. The drive assembly includes a drive motor. The output shaft of the drive motor is connected to a gear. The gear meshes with the teeth. The drive motor is used to drive the second baffle to rotate through the gear and the teeth.

7. A pyrolysis kiln according to claim 6, characterized in that, The teeth are arranged in an arc shape, and the drive motor drives the gear to switch between clockwise and counterclockwise rotation.

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