Banana waste biochar preparation device and method

Abstract

The present invention discloses a banana waste biochar production device and method, belonging to the field of biochar production. The device and method comprise a pyrolysis tank, wherein a feed port is fixedly connected to the top of the pyrolysis tank, hot oil cartridges are fixedly connected to both sides of the pyrolysis tank, a feed chute is defined at the bottom of the pyrolysis tank, a feed filter plate is fixedly connected to the feed chute, and a screening box is fixedly connected to the bottom of the pyrolysis tank. The device utilizes a drive motor, a stirring shaft, a support rod, a tipping hopper, a cutting blade, and a cutting chute to firstly tip the banana waste in the pyrolysis tank, achieving uniform heating of the banana waste, thereby improving the pyrolysis effect of the device, and secondly, to cut the banana waste into smaller particles that meet production requirements. This allows the smaller banana waste particles to better contact the heat, thereby further improving the pyrolysis effect of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of biochar preparation, and in particular to a device and method for preparing biochar from banana waste. Background Art

[0002] Banana waste biochar is a carbonaceous product made from banana peels through pyrolysis or combustion. Pyrolysis of banana waste yields high-quality biochar. Biochar has excellent adsorption and water retention properties, making it suitable for a variety of applications, including soil improvement, water treatment, and odor removal. Furthermore, biochar can be used as a fertilizer additive, providing plant nutrients and improving soil quality. Therefore, using banana waste to make biochar is an effective resource utilization method.

[0003] Currently, existing banana waste biochar production equipment directly feeds large amounts of banana waste into the pyrolysis furnace for thermal decomposition during pyrolysis. However, stacking large amounts of banana waste together can easily lead to uneven heating inside and outside the banana waste, resulting in insufficient carbonization and reduced quality of the produced biochar. Furthermore, banana waste is relatively large for granular biochar, requiring a large amount of heat for direct thermal decomposition, resulting in low thermal decomposition efficiency. If the banana waste could be cut and heated, the thermal decomposition efficiency would be greatly improved. Therefore, we propose a banana waste biochar production equipment and method to address the above issues. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art that banana waste is unevenly heated, resulting in reduced quality of the prepared biochar, and that direct thermal decomposition requires a large amount of heat and has low efficiency, and to propose a banana waste biochar preparation device and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A banana waste biochar preparation device comprises a pyrolysis tank, a feeding port is fixedly connected to the top of the pyrolysis tank, hot oil boxes are fixedly connected on both sides of the pyrolysis tank, an oil inlet pipe is fixedly connected to the upper part of the side wall of the hot oil box on one side, and an oil outlet pipe is fixedly connected to the lower part of the side wall of the hot oil box on the other side, the hot oil boxes on both sides are connected to each other, a discharge trough is provided at the bottom of the pyrolysis tank, a discharge filter plate is fixedly connected in the discharge trough, a screening box is fixedly connected to the bottom of the pyrolysis tank, and further comprises: a pyrolysis component, which is arranged in the pyrolysis tank and is used to pyrolyze and cut banana waste; a uniform heating mechanism, which is arranged in the hot oil box and is used to stir the oil in the hot oil box to achieve uniform heating; and a rolling screen component, which is arranged in the screening box and is used to roll and screen biochar.

[0007] In order to achieve uniform heating of banana waste, preferably, the pyrolysis component includes a stirring shaft, which is rotatably connected to the inner wall of the pyrolysis tank, the side wall of the pyrolysis tank is fixedly connected to a drive motor, the output shaft end of the drive motor is fixedly connected to the end of the stirring shaft, the side wall of the stirring shaft is fixedly connected to a support rod, and the end of the support rod away from the stirring shaft is fixedly connected to a tipping hopper, and the side wall of the tipping hopper is in contact with the inner wall of the pyrolysis tank.

[0008] In order to improve the pyrolysis effect, further, the side wall of the hopper is provided with cutting grooves at equal intervals, and the inner wall of the pyrolysis tank is fixedly connected with cutting blades at equal intervals. The multiple cutting blades are aligned with the cutting grooves, and the width of the cutting grooves is greater than the thickness of the cutting blades.

[0009] Furthermore, blowing blades are fixedly connected to both sides of the stirring shaft, and the inclination angles of the blowing blades on both sides are set in opposite directions.

[0010] Furthermore, one end of the tipping hopper is arranged in a slope shape, the other side of the tipping hopper is arranged in an arc hook shape, and the side of the tipping hopper that is in contact with the inner wall of the pyrolysis tank is made of magnetic material.

[0011] In order to improve the heating effect of the pyrolysis tank, preferably, the uniform heat mechanism includes a driven shaft, which is rotatably connected to the inner wall of the hot oil box, and the side wall of the driven shaft is fixedly connected with stirring impellers at equal intervals, and the end of the stirring impeller away from the driven shaft is fixedly connected with a magnetic sheet.

[0012] Furthermore, the magnetic sheet is magnetically attracted to the side wall of the tipping hopper, and the diameter of the circle formed by the magnetic sheet is smaller than the inner diameter width of the hot oil box.

[0013] In order to improve the pyrolysis effect of banana waste, preferably, the roller screen assembly includes a linkage shaft, the linkage shaft is rotatably connected to the inner wall of the screening box, the side walls of the linkage shaft on both sides are transmission-connected with a transmission belt, the outer ends of the linkage shaft on both sides are transmission-connected by a pulley set, the other side of the outer end of the linkage shaft is fixedly connected to a driven runner, the outer end of the stirring shaft is fixedly connected to a driving runner, and the driving runner and the driven runner are connected by a belt transmission.

[0014] Furthermore, a first discharge port and a second discharge port are respectively provided on both sides of the screening box, the transmission belt is arranged at an angle and is made of high-temperature resistant material, and screening holes are provided at equal intervals on the side walls of the transmission belt.

[0015] A method for preparing biochar from banana waste, comprising the following steps:

[0016] S1, first the cleaned banana waste is poured into the pyrolysis tank from the feed port, then the feed port is closed and hot oil is filled into the hot oil box;

[0017] S2, turn on the drive motor to drive the stirring shaft and the tipping hopper to turn over the banana waste, realize uniform heating of the banana waste, and utilize the cutting groove and cutting blade to realize cutting of the banana waste;

[0018] S3, the cut banana waste passes through the discharge filter plate and falls on the surface of the transmission belt. At this time, the transmission effect between the pulley group and the driven runner is utilized to make the banana waste continuously turn and roll on the transmission belt and undergo pyrolysis;

[0019] S4. The banana waste is constantly turned over and rolled on the conveyor belt, which will filter the smaller parts inside to the bottom of the screening box, while those that meet the production requirements remain on the conveyor belt to achieve material screening.

[0020] Compared with the prior art, the present invention provides a device and method for preparing biochar from banana waste, which has the following beneficial effects:

[0021] 1. The banana waste biochar preparation equipment, through the arrangement of the drive motor, stirring shaft, support rod, turning hopper, cutting blade and cutting groove, can firstly turn the banana waste in the pyrolysis tank to achieve uniform heating of the banana waste, thereby improving the pyrolysis effect of the device; secondly, it can cut the banana waste into smaller particles that meet production requirements, so that the smaller particles of banana waste can better contact with heat, thereby further improving the pyrolysis effect of the device and ensuring the carbonization effect of the device.

[0022] 2. The banana waste biochar preparation equipment, through the arrangement of the linkage shaft, transmission belt, pulley group, driven rotor and driving rotor, can also cause the cut banana waste particles falling on the surface of the transmission belt to be continuously turned over during the rotation of the stirring shaft, so that they are fully in contact with the heat in the screening box, thereby improving the pyrolysis effect of the banana waste, ensuring the carbonization effect of the device, and being able to screen banana waste particles of different particle sizes, thereby meeting different production needs and improving the practicality of the device.

[0023] 3. The banana waste biochar preparation equipment uses the magnetic attraction between the magnetic sheet and the tipping hopper. During the rotation of the tipping hopper, the stirring impeller and the driven shaft will be driven to rotate, thereby stirring the oil in the hot oil box to make it shake, so that the intersection and mixing of the oil in each part can achieve uniform heating, thereby improving the heating effect of the oil on the inner wall of the pyrolysis tank, and further improving the pyrolysis effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a banana waste biochar preparation device proposed in the present invention;

[0025] Figure 2 This is a side view schematic diagram of the overall structure of a banana waste biochar preparation device proposed in the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of a pyrolysis tank of a banana waste biochar production device proposed in the present invention;

[0027] Figure 4 This is a side view half-section schematic diagram of a banana waste biochar preparation device proposed in the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of a pyrolysis tank of a banana waste biochar preparation device proposed in the present invention;

[0029] Figure 6 This is a schematic diagram of the structure inside the screening box of a banana waste biochar preparation device proposed in the present invention;

[0030] Figure 7 This is a schematic structural diagram of the uniform heating mechanism of a banana waste biochar preparation device proposed in the present invention.

[0031] In the figure: 1. Pyrolysis tank; 101. Feed inlet; 102. Discharge filter plate; 103. Drive motor; 2. Hot oil box; 21. Oil inlet pipe; 22. Oil outlet pipe; 3. Screening box; 31. First discharge port; 32. Second discharge port; 4. Pyrolysis assembly; 41. Stirring shaft; 411. Blowing blade; 412. Active runner; 42. Support rod; 43. Tipping hopper; 431. Cutting groove; 44. Cutting disc; 5. Heat uniforming mechanism; 51. Driven shaft; 52. Stirring impeller; 53. Magnetic sheet; 6. Rolling screen assembly; 61. Linkage shaft; 611. Driven runner; 62. Transmission belt; 621. Screening hole; 63. Pulley group. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] Example 1:

[0035] Reference Figure 1-Figure 7 A banana waste biochar preparation device includes a pyrolysis tank 1. The pyrolysis tank 1 is cylindrical in shape. A feed port 101 is fixedly connected to the top of the pyrolysis tank 1. The feed port 101 is communicated with the top of the pyrolysis tank 1. Hot oil boxes 2 are fixedly connected on both sides of the pyrolysis tank 1. An oil inlet pipe 21 is fixedly connected to the upper part of the side wall of the hot oil box 2 on one side. The oil inlet pipe 21 is used to inject hot oil. An oil outlet pipe 22 is fixedly connected to the lower part of the side wall of the hot oil box 2 on the other side. The oil outlet pipe 22 is used to discharge the cooled oil after the pyrolysis is completed. The hot oil boxes 2 on both sides are communicated with each other. A feed trough is provided at the bottom of the pyrolysis tank 1. A feed filter plate 102 is fixedly connected in the feed trough. A screening box 3 is fixedly connected to the bottom of the pyrolysis tank 1.

[0036] The present embodiment discloses a banana waste biochar preparation device, which also includes: a pyrolysis component 4, which is arranged in a pyrolysis tank 1 and is used to pyrolyze and cut the banana waste; a uniform heating mechanism 5, which is arranged in a hot oil box 2 and is used to stir the oil in the hot oil box 2 to achieve uniform heating; a rolling screen component 6, which is arranged in a screening box 3 and is used to perform rolling screening on the biochar.

[0037] First, banana waste is put into the pyrolysis tank 1 through the feed port 101, and then hot oil is injected into the hot oil box 2 to heat the pyrolysis tank 1, so as to pyrolyze the banana waste. During the heating process, the setting of the pyrolysis component 4 can turn and cut the banana waste, so that it can be more comprehensively exposed to the heat in the pyrolysis tank 1, thereby improving the pyrolysis effect of the device; and during the pyrolysis process, the uniform heating mechanism 5 will also rotate, thereby stirring the oil in the hot oil box to make it shake, so that the intersection and mixing of the oil parts are uniformly heated, thereby improving the heating effect of the oil on the inner wall of the pyrolysis tank; and the cut banana waste particles will pass through the discharge filter plate 102 and fall on the rolling screen component 6, where the particles will be rolled and turned for pyrolysis, and the fine particles inside will be screened and collected.

[0038] Reference Figure 3-Figure 5 The pyrolysis assembly 4 includes a stirring shaft 41, which is rotatably connected to the inner wall of the pyrolysis tank 1. The side wall of the pyrolysis tank 1 is fixedly connected to a driving motor 103. The output shaft end of the driving motor 103 is fixedly connected to the end of the stirring shaft 41. The side wall of the stirring shaft 41 is fixedly connected to a support rod 42. The support rod 42 is generally arc-shaped and has a circular end face. The end of the support rod 42 away from the stirring shaft 41 is fixedly connected to a tipping hopper 43. The side wall of the tipping hopper 43 is in contact with the inner wall of the pyrolysis tank 1. , one end of the tipping hopper 43 is sloped, the other side of the tipping hopper 43 is hooked, and the side of the tipping hopper 43 that fits the inner wall of the pyrolysis tank 1 is made of magnetic material, and cutting grooves 431 are evenly spaced on the side wall of the tipping hopper 43. Cutting blades 44 are fixedly connected to the inner wall of the pyrolysis tank 1 at equal intervals. The cutting grooves 431 have the same shape as the cutting blades 44. Multiple cutting blades 44 are aligned with the cutting grooves 431, and the width of the cutting grooves 431 is greater than the thickness of the cutting blades 44.

[0039] By setting the above structure, the banana waste in the pyrolysis tank 1 can be turned over, so that the banana waste is evenly heated, thereby improving the pyrolysis effect of the device. As the turning hopper 43 rotates, the cutting groove 431 provided on its side wall will move to the cutting blade 44, and the cutting blade 44 will pass through the cutting groove 431 to cut the banana waste into smaller particles that meet production requirements. In this way, the smaller particles of banana waste can better contact with the heat, thereby further improving the pyrolysis effect of the device.

[0040] Reference Figure 3, wherein, blowing blades 411 are fixedly connected to both sides of the stirring shaft 41, and the inclination angles of the blowing blades 411 on both sides are set in opposite directions. In this way, when the stirring shaft 41 rotates, the blowing blades 411 will also be driven to rotate. The blowing blades 411 set at opposite inclination angles on both sides will blow the heat flow in the pyrolysis tank 1 in opposite directions to quickly contact the banana waste, thereby improving the pyrolysis efficiency of the banana waste.

[0041] Reference Figure 4 、 Figure 5 and Figure 7 The heat uniforming mechanism 5 includes a driven rotating shaft 51, which is rotatably connected to the inner wall of the hot oil box 2. The side wall of the driven rotating shaft 51 is fixedly connected with a stirring impeller 52 at equal intervals. The end of the stirring impeller 52 away from the driven rotating shaft 51 is fixedly connected with a magnetic sheet 53. The magnetic sheet 53 is magnetically attracted to the side wall of the tipping hopper 43, and the circumferential diameter formed by the magnetic sheet 53 is smaller than the inner diameter width of the hot oil box 2. In this way, the magnetic attraction between the magnetic sheet 53 and the tipping hopper 43 is utilized. During the rotation of the tipping hopper 43, the stirring impeller 52 and the driven rotating shaft 51 will also be driven to rotate, thereby stirring the oil in the hot oil box 2 to make it shake, so that the intersection and mixing of the oil in each part is achieved to achieve uniform heating, thereby improving the heating effect of the oil on the inner wall of the pyrolysis tank 1, and thus improving the pyrolysis effect of the device.

[0042] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 6 , wherein the rolling screen assembly 6 includes a linkage shaft 61, which is rotatably connected to the inner wall of the screening box 3, and the side walls of the linkage shaft 61 on both sides are connected with a transmission belt 62, and the outer ends of the linkage shaft 61 on both sides are connected by a pulley group 63, and the other side of the outer end of the linkage shaft 61 is fixedly connected to a driven runner 611, and the outer end of the stirring shaft 41 is fixedly connected to the driving runner 412, and the driving runner 412 is connected to the driven runner 611 through a belt transmission. A first discharge port 31 and a second discharge port 32 are respectively provided on both sides of the screening box 3, and the transmission belt 62 is inclined and made of high-temperature resistant material. Screening holes 621 are evenly spaced on the side walls of the transmission belt 62, and the aperture of the screening hole 621 is smaller than the particle size of the standard ecological charcoal particles to be produced;

[0043] By setting up the above structure, the banana waste particles that have been cut and landed on the surface of the transmission belt 62 can be continuously turned over so that they can fully contact the heat in the screening box 3, thereby improving the pyrolysis effect of the banana waste. Moreover, by using the transmission belt 62 with the screening holes 621, banana waste particles of different particle sizes can be screened to meet different production needs, thereby improving the practicality of the device.

[0044] Reference Figure 1-Figure 7 When the present invention is used, first, the cleaned banana waste is poured into the pyrolysis tank 1 from the feed port 101 and the feed port 101 is closed, and then hot oil is filled into the hot oil box 2 from the oil inlet pipe 21. The hot oil is in contact with the pyrolysis tank 1 to heat the inner wall of the pyrolysis tank 1, thereby forming a high temperature in the pyrolysis tank 1 to pyrolyze the banana waste. In the process of pyrolysis, the driving motor 103 is turned on to drive the stirring shaft 41 and the tipping hopper 43 to rotate, thereby turning the banana waste in the pyrolysis tank 1, achieving uniform heating of the banana waste, and in the process of rotation of the tipping hopper 43, the banana waste is heated. The waste will be shoveled into the inner cavity of the tipping hopper 43. As the tipping hopper 43 rotates, the cutting groove 431 provided on its side wall will move to the cutting blade 44, and the cutting blade 44 will pass through the cutting groove 431 to cut the banana waste, so that the smaller particles of banana waste can be better exposed to the heat. At the same time, due to the magnetic attraction between the magnetic sheet 53 and the tipping hopper 43, the stirring impeller 52 and the driven shaft 51 will also be driven to rotate during the rotation of the tipping hopper 43, thereby stirring the oil in the hot oil box 2 and causing it to shake, so that the intersection and mixing of the oil parts can achieve uniform heating.

[0045] The cut banana waste passes through the discharge filter plate 102 and falls on the surface of the transmission belt 62. At this time, the transmission effect between the pulley group 63 and the driven runner 611 will drive the discharge filter plate 102 to rotate upward, and the banana waste will also roll downward on the surface of the discharge filter plate 102 due to gravity, so that the banana waste is continuously turned over and rolled on the transmission belt 62, so that the banana waste is better in contact with the heat flow in the screening box 3, thereby achieving more comprehensive pyrolysis; and when the banana waste is continuously turned over and rolled on the transmission belt 62, the smaller part inside it is filtered to the bottom of the pyrolysis tank 1, and the part that meets the production requirements remains on the transmission belt 62, and finally the biochar particles of different particle sizes are discharged from the screening box 3 from the first discharge port 31 and the second discharge port 32, thereby achieving material screening.

[0046] Example 2:

[0047] Basically the same as Example 1, on the basis of Example 1, a preparation method of a banana waste biochar preparation device is proposed.

[0048] Reference Figure 1-Figure 7 , a method for preparing biochar from banana waste, the steps are as follows:

[0049] S1. First, cleaned banana waste is poured into the pyrolysis tank 1 through the feed port 101 and the feed port 101 is closed. Then, hot oil is filled into the hot oil box 2 through the oil inlet pipe 21. The hot oil contacts the pyrolysis tank 1 to heat the inner wall of the pyrolysis tank 1, thereby forming a high temperature in the pyrolysis tank 1, thereby pyrolyzing the banana waste.

[0050] S2. During the pyrolysis process, the driving motor 103 is turned on to drive the stirring shaft 41 and the tipping hopper 43 to rotate, thereby turning the banana waste in the pyrolysis tank 1, achieving uniform heating of the banana waste, and in the process of the rotation of the tipping hopper 43, the banana waste will be shoveled into the inner cavity of the tipping hopper 43. As the tipping hopper 43 rotates, the cutting groove 431 provided on its side wall will move to the cutting blade 44, and the cutting blade 44 passes through the cutting groove 431 to achieve cutting of the banana waste, so that smaller particles of banana waste can be better exposed to heat; at the same time, by utilizing the magnetic attraction between the magnetic sheet 53 and the tipping hopper 43, the stirring impeller 52 and the driven rotating shaft 51 will also be driven to rotate during the rotation of the tipping hopper 43, thereby stirring the oil in the hot oil box 2 to make it shake, so that the intersection and mixing of the oil parts can achieve uniform heating;

[0051] S3. The cut banana waste passes through the discharge filter plate 102 and falls on the surface of the transmission belt 62. At this time, the transmission effect between the pulley set 63 and the driven runner 611 will drive the discharge filter plate 102 to rotate upward. The banana waste will also roll downward on the surface of the discharge filter plate 102 due to gravity, so that the banana waste will continuously turn and roll on the transmission belt 62, so that the banana waste can better contact with the heat flow in the screening box 3, thereby achieving more comprehensive pyrolysis.

[0052] S4. The banana waste is continuously turned and rolled on the conveyor belt 62, and the smaller part inside it is filtered to the bottom of the pyrolysis tank 1, while the part that meets the production requirements remains on the conveyor belt 62. Finally, biochar particles of different particle sizes are discharged from the first discharge port 31 and the second discharge port 32 to the screening box 3, thereby achieving material screening.

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A banana waste biochar preparation device, comprising a pyrolysis tank (1), characterized in that: The top of the pyrolysis tank (1) is fixedly connected to a feed port (101), and both sides of the pyrolysis tank (1) are fixedly connected to hot oil boxes (2). The upper part of the side wall of the hot oil box (2) on one side is fixedly connected to an oil inlet pipe (21), and the lower part of the side wall of the hot oil box (2) on the other side is fixedly connected to an oil outlet pipe (22). The hot oil boxes (2) on both sides are connected to each other. A feed trough is provided at the bottom of the pyrolysis tank (1), and a feed filter plate (102) is fixedly connected to the feed trough. A screening box (3) is fixedly connected to the bottom of the pyrolysis tank (1), and further comprises: A pyrolysis component (4), the pyrolysis component (4) being arranged in the pyrolysis tank (1), and the pyrolysis component (4) being used for pyrolyzing and cutting banana waste; A uniform heating mechanism (5), the uniform heating mechanism (5) being arranged in the hot oil box (2), and being used to move the oil in the hot oil box (2) to achieve uniform heating; A rolling screen assembly (6), the rolling screen assembly (6) being arranged in the screening box (3), and the rolling screen assembly (6) being used for rolling screening of the biochar; The pyrolysis assembly (4) includes a stirring shaft (41), the stirring shaft (41) is rotatably connected to the inner wall of the pyrolysis tank (1), the side wall of the pyrolysis tank (1) is fixedly connected to a driving motor (103), the output shaft end of the driving motor (103) is fixedly connected to the end of the stirring shaft (41), the side wall of the stirring shaft (41) is fixedly connected to a support rod (42), the end of the support rod (42) away from the stirring shaft (41) is fixedly connected to a tipping hopper (43), the side wall of the tipping hopper (43) is in contact with the inner wall of the pyrolysis tank (1), the side wall of the tipping hopper (43) is provided with cutting grooves (431) at equal intervals, and the inner wall of the pyrolysis tank (1) is fixedly connected to cutting blades (44) at equal intervals; One end of the tipping hopper (43) is arranged in a sloped shape, and the other side of the tipping hopper (43) is arranged in an arc hook shape, and the side of the tipping hopper (43) that is in contact with the inner wall of the pyrolysis tank (1) is made of magnetic material; The heat uniforming mechanism (5) comprises a driven rotating shaft (51), the driven rotating shaft (51) being rotatably connected to the inner wall of the hot oil box (2), a stirring impeller (52) being fixedly connected to the side wall of the driven rotating shaft (51) at equal intervals, a magnetic sheet (53) being fixedly connected to one end of the stirring impeller (52) away from the driven rotating shaft (51), and the magnetic sheet (53) being magnetically attracted to the side wall of the tipping hopper (43).

2. A banana waste biochar production device according to claim 1, characterized in that, The plurality of cutting blades (44) are aligned with the cutting groove (431), and the width of the cutting groove (431) is greater than the thickness of the cutting blade (44).

3. The banana waste biochar production equipment according to claim 1, characterized in that: Blowing blades (411) are fixedly connected to both sides of the stirring shaft (41), and the inclination angles of the blowing blades (411) on both sides are arranged in opposite directions.

4. The banana waste biochar production equipment according to claim 1, characterized in that: Furthermore, the circumferential diameter formed by the magnetic sheet (53) is smaller than the inner diameter width of the hot oil box (2).

5. The banana waste biochar production equipment according to claim 1, characterized in that: The roller screen assembly (6) comprises a linkage shaft (61), the linkage shaft (61) being rotatably connected to the inner wall of the screening box (3), the side walls of the linkage shaft (61) on both sides being transmission-connected with a transmission belt (62), the outer ends of the linkage shaft (61) on both sides being transmission-connected via a pulley set (63), the other side of the outer end of the linkage shaft (61) being fixedly connected to a driven runner (611), the outer end of the stirring shaft (41) being fixedly connected to a driving runner (412), and the driving runner (412) and the driven runner (611) being connected via a belt transmission.

6. The banana waste biochar production equipment according to claim 5, characterized in that: A first discharge port (31) and a second discharge port (32) are respectively provided on both sides of the screening box (3); the transmission belt (62) is arranged at an angle and is made of a high-temperature resistant material; and screening holes (621) are provided on the side walls of the transmission belt (62) at equal intervals.

7. A method for preparing biochar from banana waste, using the banana waste biochar preparation device according to any one of claims 1 to 6, characterized in that: The steps are as follows: S1. First, cleaned banana waste is poured into the pyrolysis tank (1) from the feed inlet (101), then the feed inlet (101) is closed and hot oil is filled into the hot oil box (2); S2, turning on the driving motor (103) to drive the stirring shaft (41) and the turning hopper (43) to turn the banana waste, thereby achieving uniform heating of the banana waste, and using the cutting groove (431) and the cutting blade (44) to cut the banana waste; S3, the cut banana waste passes through the discharge filter plate (102) and falls on the surface of the transmission belt (62). At this time, the transmission effect between the pulley group (63) and the driven rotating wheel (611) is utilized to make the banana waste continuously turn and roll on the transmission belt (62) and undergo pyrolysis; S4. The banana waste is continuously turned and rolled on the conveyor belt (62), and the smaller part inside it is filtered to the bottom of the screening box (3), while the part that meets the production requirements remains on the conveyor belt (62), thereby achieving material screening.

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