Straw carbonization recycling method and device thereof

Abstract

The present application relates to the technical field of straw recycling, and discloses a straw carbonization recycling method and device, which comprises a crushing device, two combustion boxes are arranged below the crushing device, a carbonization box is arranged in the combustion box, a compaction device is arranged below the two combustion boxes, a gap is arranged between the combustion box and the carbonization box, and a burner corresponding to the gap is arranged on the combustion box. The straw carbonization recycling device overcomes the defects of traditional intermittent and continuous carbonization devices through the cooperative design of the double carbonization boxes, the storage cavity and the second spiral stirring shaft. Meanwhile, the hot gas discharged from the combustion box during the overlapping period can be concentrated on the storage cavity, and the continuous stirring of the second spiral stirring shaft can avoid the problems of uneven preheating and long time consumption of the straw accumulation in the intermittent device, and solve the pain points of short contact time of the straw and the hot gas and insufficient utilization of waste heat in the continuous device.

Description

Technical Field

[0001] This invention relates to the field of straw recycling technology, and in particular to a method and apparatus for the carbonization and recycling of straw. Background Technology

[0002] Currently, the traditional methods for treating straw waste mainly involve open burning and indiscriminate dumping, which not only causes serious air pollution and resource waste, but also easily leads to fires and arable land occupation. Straw carbonization technology can transform loose straw into high-density, highly stable biochar. This biochar can not only serve as a soil conditioner to improve soil fertility and reduce carbon emissions, but also as a clean fuel to replace coal. It can also be processed into adsorbent materials to treat wastewater, achieving the triple value of reduction, harmlessness, and resource utilization. Therefore, it has become one of the core directions for the efficient utilization of straw.

[0003] Existing straw carbonization devices are mainly divided into two categories: intermittent and continuous. Intermittent devices have a relatively simple structure, achieving carbonization through batch operations of feeding, carbonization, and discharging. However, in a single batch operation, the feeding and discharging stages require machine shutdown, resulting in insufficient effective operating time and low processing efficiency, making it difficult to meet the needs of medium-scale production. Continuous devices, although capable of uninterrupted operation through structures such as screw conveyors and multi-section furnaces, have long equipment chains, large footprints, high maintenance costs, and complex operation, making them unsuitable for small- to medium-sized carbonization operations. Furthermore, while existing devices attempt to utilize… The use of heat generated during carbonization to preheat and dry crushed straw aims to reduce energy consumption, but its actual effectiveness is limited: In intermittent devices, the crushed straw is piled up in the storage or pretreatment area, making it difficult for heat to penetrate the pile layer, which can easily lead to local overheating and uneven drying. Furthermore, preheating can only be completed after the carbonization and discharge processes are finished, which is time-consuming and may result in local overheating. In continuous devices, the crushed straw is quickly conveyed into the carbonization device, resulting in short contact time with the heat and insufficient absorption of waste heat, leading to poor preheating and drying effects and failing to effectively utilize the value of waste heat recovery. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the intermittent carbonization device in the prior art is inefficient, and the continuous device occupies a large area and is difficult to maintain, making it unsuitable for small and medium-sized operations. At the same time, both types of devices have the disadvantage of poor utilization of waste heat from carbonization. Therefore, we propose a method and device for the carbonization and recycling of straw.

[0005] To achieve the above objectives, this application adopts the following technical solution: a straw carbonization and recycling device, including a crushing device, combustion boxes are respectively arranged on both sides below the crushing device, a carbonization box is arranged inside the combustion box, a compaction device is arranged below the two combustion boxes, a gap is arranged between the combustion box and the carbonization box, and a burner corresponding to the gap is arranged on the combustion box, a discharge pipe connected to the feed inlet of the compaction device is arranged at one end of the carbonization box, a storage cavity is arranged at the lower end of the crushing device, a feeding pipe connected to the storage cavity is arranged at one end of the carbonization box, a preheating cavity is arranged around the lower end of the storage cavity, and the carbonization box and the preheating cavity are connected by a hot air inlet pipe;

[0006] The bottom of the storage cavity is arc-shaped, and a swing groove is provided on the inner side of the bottom of the storage cavity. An arc-shaped swing plate is movably provided on the inner side of the swing groove. One end of the swing plate is provided with a second through hole that matches the feeding pipe. When the second through hole matches the feeding pipe, the carbonization box is connected to the storage cavity.

[0007] The storage cavity is provided with a second spiral stirring shaft that corresponds to the second through hole in the middle of its inner side, and the second spiral stirring shaft can swing with the swing plate.

[0008] Preferably, there are two second spiral stirring shafts, which rotate synchronously through a synchronization component. One second spiral stirring shaft corresponds to the second through hole, and the lower end of the other second spiral stirring shaft extends downward through the swing plate.

[0009] The synchronization component includes a connecting seat located at the upper inner side of the storage cavity, two second spiral stirring shafts extending to the inner side of the connecting seat and equipped with synchronization wheels, the two synchronization wheels being connected by a synchronization belt, and a mounting frame installed at the upper inner side of the storage cavity. The connecting seat and the mounting frame are rotatably connected, and the axis of the rotatable connection coincides with the axis of the swing plate.

[0010] Preferably, a first spiral stirring shaft is rotatably provided in the middle of the inner side of the carbonization box.

[0011] Preferably, one end of the combustion chamber is provided with a linkage assembly for driving the first spiral stirring shaft and the second spiral stirring shaft to rotate. The linkage assembly includes a rotating shaft rotatably disposed at one end of the two combustion chambers. One end of the first spiral stirring shaft extends to the outside of the combustion chamber and is provided with a worm gear. The end of the rotating shaft is provided with a worm gear that meshes with the worm gear. One end of the rotating shaft is provided with a bevel gear. The bottom of the second spiral stirring shaft extending to below the swing plate is provided with a telescopic universal joint, and the lower end of the telescopic universal joint is provided with a second bevel gear that meshes with the bevel gear. One end of the combustion chamber is provided with a first reduction motor for driving the rotating shaft to rotate.

[0012] Preferably, the bottom of the storage cavity is provided with a driving assembly for driving the swing plate to swing back and forth. The driving assembly includes a second geared motor installed at one end of the bottom of the storage cavity. One end of the bottom of the storage cavity is provided with a clearance groove corresponding to the second spiral stirring shaft away from the second through hole. One end of the bottom of the swing plate is uniformly provided with a rack. The output end of the second geared motor is provided with a gear that meshes with the rack and is driven to rotate by the second geared motor.

[0013] Preferably, a first hot air pipe communicating with the preheating chamber is provided on one side of the storage cavity.

[0014] Preferably, a filter box is provided on one side of the storage cavity, a filter screen is provided inside the filter box, a condenser is connected to one end of the filter box, and the gap between the combustion box and the carbonization box is connected to the filter box through a flue gas pipe.

[0015] Preferably, a pressure box is connected to the upper end of the filter box, a thermal expansion and contraction component is provided inside the pressure box, a brush strip frame corresponding to one side of the filter screen is provided at the bottom of the thermal expansion and contraction component, one end of the first hot air exhaust pipe is connected to the pressure box, and a second hot air exhaust pipe is connected to the side of the pressure box.

[0016] Preferably, the thermal expansion and contraction component is a bimetallic strip.

[0017] The present invention also includes an embodiment, specifically a method for the carbonization and recycling of straw, comprising the following steps:

[0018] S1: Straw is fed into the crushing device for crushing. After crushing, it falls into the storage chamber for storage. While one carbonization box is carbonizing, the other carbonization box is discharged and fed. During the discharge, the hot air generated by the combustion box during the carbonization process heats the straw in the storage chamber.

[0019] S2: After one of the carbonization boxes finishes discharging, the swing plate drives the second through hole to swing to the feeding pipe corresponding to the carbonization box for feeding. After feeding, both carbonization boxes are in the carbonization stage, and the crushing device continues to crush. During this period, the hot air generated by the two combustion boxes preheats the straw in the storage chamber.

[0020] S3: Subsequently, the carbonization box that was carbonized first finishes carbonization and discharges the material. During the discharge, the hot air generated by the combustion box that is carbonizing continues to preheat the straw in the storage chamber. After the discharge is completed, the material is fed in. Then the two carbonization boxes enter the carbonization overlap period again. The crushing device continues to crush the straw. The hot air generated by the two combustion boxes preheats the straw in the storage chamber. This process is repeated.

[0021] S4: The carbonized material is discharged into the compaction device for compaction and extrusion.

[0022] The technical effects and advantages of this invention are as follows:

[0023] This invention overcomes the shortcomings of traditional intermittent and continuous carbonization devices through the coordinated design of a dual carbonization box, storage chamber, and second spiral stirring shaft. Compared to the intermittent device's batch shutdown operation mode of feeding, carbonization, and discharging, this solution achieves alternating operation based on the carbonization time being greater than the feeding + discharging time. While one device is carbonizing, the other can simultaneously complete discharging and feeding and enter the carbonization state, forming a stable overlapping period of simultaneous carbonization between the two devices, thus solving the problems of low efficiency and capacity gaps in intermittent devices. Compared to continuous devices, this solution adopts a vertical layout with the crushing device on top, the dual carbonization box in the middle, and the compaction device at the bottom, eliminating the need for a complex transverse continuous conveying system. The core components are compactly arranged vertically, significantly reducing the footprint and simplifying equipment procurement and installation. With lower installation costs and a centralized core component and clear maintenance path, it facilitates daily maintenance and better meets the space and cost requirements of small and medium-sized carbonization operations. At the same time, the hot air discharged from the combustion chamber during the overlap period can be concentrated on the storage chamber. Combined with the continuous stirring of the second spiral stirring shaft, it avoids the problems of uneven preheating and long time consumption of straw accumulation in intermittent devices, and solves the pain points of short contact time between straw and hot air and insufficient utilization of residual heat in continuous devices. Moreover, since the straw preheating time is approximately equal to the overlap time of synchronous carbonization plus the time of material discharge from a carbonization box, and it is less than the time of a complete carbonization cycle, the straw preheating time can be controlled. While ensuring sufficient preheating and drying, it effectively avoids the problem of over-drying of straw and scorching before carbonization due to excessive preheating time. Attached Figure Description

[0024] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall structure of the crushing device, combustion chamber, and compaction device of the present invention;

[0028] Figure 4 This is a cross-sectional structural diagram of the combustion chamber and carbonization chamber of the present invention;

[0029] Figure 5 For the present invention Figure 4 A structural diagram from another perspective based on the above;

[0030] Figure 6 This is a schematic diagram of the structure from the bottom of the storage cavity of the present invention;

[0031] Figure 7 This is a schematic cross-sectional view of the storage cavity of the present invention;

[0032] Figure 8 This is a structural diagram of the storage cavity, swing plate, and crushing device of the present invention in a disassembled state;

[0033] Figure 9 For the present invention Figure 8 A structural diagram from another perspective based on the above;

[0034] Figure 10 This is a schematic diagram of the second spiral stirring shaft and connecting seat of the present invention in a disassembled state;

[0035] Figure 11 This is a schematic diagram of the overall structure of the filter box and condenser of the present invention;

[0036] Figure 12 This is a structural diagram of the filter screen, the first hot air pipe, and the filter box of the present invention in a disassembled state.

[0037] Legend: 1. Crushing device; 2. Storage chamber; 3. Combustion chamber; 4. Compaction device; 5. Filter box; 6. Condenser; 7. Discharge pipe; 8. Feed pipe; 9. Burner; 10. Carbonization box; 11. First spiral stirring shaft; 12. Worm gear; 13. First geared motor; 14. First hot gas exhaust pipe; 15. First through hole; 16. Clearance groove; 17. Rotating shaft; 18. Worm; 19. First bevel gear; 20. Telescopic universal joint; 21. 1. Swing plate; 22. Rack; 23. Second geared motor; 24. Second spiral stirring shaft; 25. Preheating chamber; 26. Swing groove; 27. Mounting bracket; 28. Connecting seat; 29. ​​Gear; 30. Second through hole; 31. Synchronous pulley; 32. Synchronous belt; 33. Flue gas pipe; 34. Pressure box; 35. Second hot air exhaust pipe; 36. Filter screen; 37. Brush holder; 38. Thermal expansion and contraction component; 39. Hot air inlet pipe; 40. Second bevel gear. Detailed Implementation

[0038] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0039] Reference Figures 1-12As shown, a straw carbonization and recycling device includes a crushing device 1, combustion chambers 3 are respectively arranged on both sides below the crushing device 1, and a carbonization chamber 10 is arranged inside the combustion chamber 3. A compaction device 4 is arranged below the two combustion chambers 3. The crushing device 1, combustion chambers 3, and compaction device 4 are connected as one unit. The compaction device 4 and the crushing device 1 are conventional and mature technologies, and will not be described in detail in this invention. A gap is provided between the combustion chambers 3 and the carbonization chambers 10, and a burner 9 corresponding to the gap is provided on the combustion chamber 3 to facilitate heating of the carbonization chamber 10. A discharge pipe 7 is provided at one end of the carbonization chamber 10, which is connected to the feed inlet of the compaction device 4. The discharge pipe 7 is inclined and a control valve is provided on the discharge pipe 7. A storage device is provided at the lower end of the crushing device 1. Storage chamber 2 is used to store crushed straw. One end of the carbonization box 10 is equipped with a feeding pipe 8 connected to storage chamber 2. The feeding pipe 8 is inclined. Specifically, the bottom of storage chamber 2 has symmetrically arranged first through holes 15 at both ends, connecting to storage chamber 2. The feeding pipe 8 connects to storage chamber 2 through the first through holes 15. A preheating chamber 25 is arranged around the lower periphery of storage chamber 2. To facilitate the discharge of hot air entering the preheating chamber 25, a first hot air exhaust pipe 14 connected to the preheating chamber 25 is arranged on one side of storage chamber 2. The carbonization box 10 and preheating chamber 25 are connected through a hot air inlet pipe 39. The bottom of storage chamber 2 is an insulation plate to avoid affecting the bottom structure. To facilitate the concentration of material in storage chamber 2 towards the center, the bottom of storage chamber 2 is arc-shaped. A swing groove 26 is provided on the inner side of the bottom, and an arc-shaped swing plate 21 is movably arranged inside the swing groove 26. One end of the swing plate 21 is provided with a second through hole 30 that matches the feeding pipe 8. When the second through hole 30 matches the feeding pipe 8, the carbonization box 10 is connected to the storage chamber 2. A second spiral stirring shaft 24 corresponding to the second through hole 30 is rotatably arranged in the middle of the inner side of the storage chamber 2, and the second spiral stirring shaft 24 can swing with the swing plate 21. Specifically, in order to realize the swing, the number of second spiral stirring shafts 24 is preferably two. The two second spiral stirring shafts 24 are synchronized by a synchronization component. One second spiral stirring shaft 24 corresponds to the second through hole 30, and the lower end of the other second spiral stirring shaft 24 extends downward through the swing plate 21. In one embodiment, the synchronization assembly includes a connecting seat 28 located at the upper inner side of the storage cavity 2. The upper ends of two second spiral stirring shafts 24 extend into the connecting seat 28 and are equipped with synchronous wheels 31. The two synchronous wheels 31 are connected by a synchronous belt 32, or synchronous rotation can be achieved by chain sprocket or gear meshing. A mounting bracket 27 is installed at the upper inner side of the storage cavity 2. The connecting seat 28 and the mounting bracket 27 are rotatably connected by a pin, and the axis of the rotatable connection coincides with the axis of the swing plate 21, thereby enabling the second spiral stirring shafts 24 to follow the swing plate 21. To achieve the swing of the swing plate 21, a drive assembly for driving the swing plate 21 to reciprocate is provided at the bottom of the storage cavity 2.The drive assembly includes a second geared motor 23 installed at one end of the bottom of the storage cavity 2. One end of the bottom of the storage cavity 2 is provided with a clearance groove 16 corresponding to the second spiral stirring shaft 24 away from the second through hole 30. One end of the bottom of the swing plate 21 is uniformly provided with racks 22. The output end of the second geared motor 23 is provided with a gear 29 that meshes with the rack 22 and is driven to rotate by the second geared motor 23. High-temperature resistant sealing rings are embedded at corresponding locations on the inner wall of the swing groove 26, the periphery of the clearance groove 16, and the periphery of the first through hole 15. The sealing rings are in contact with the surface of the swing plate 21 to prevent impurities from entering the gap between the swing groove 26 and the swing plate 21. The sealing rings are a mature technology and will not be described in detail here.

[0040] The design of the second spiral stirring shaft 24, which can swing synchronously with the second through hole 30, further optimizes the material conveying and processing process: During the feeding stage, the second spiral stirring shaft 24 swings towards the feeding pipe 8 of the target carbonization box 10 with the second through hole 30. It can accelerate the transfer of preheated straw to the carbonization box 10 with the help of the spiral pushing force. Compared with simply relying on gravity feeding, it greatly shortens the feeding time and effectively avoids material blockage in the conveying channel, ensuring a smooth and efficient feeding process. When not feeding, the second spiral stirring shaft 24 returns to the middle position of the storage chamber 2 with the staggered second through hole 30 and feeding pipe 8. At this time, in conjunction with the arc-shaped bottom structure of the storage chamber 2, it can push the material to form a circulating flow state of downward conveying, bottom impact diffusion, and upper material filling. This not only avoids the formation of dead corners or caking of materials in the corners of the chamber, but also continuously stirs and pre-treats the newly crushed straw, ensuring that all materials in the storage chamber can fully contact the hot air, maintain a stable preheating effect, and provide uniform and dry raw materials for subsequent feeding.

[0041] To agitate the material during carbonization, a first spiral stirring shaft 11 is rotatably mounted in the center of the inner side of the carbonization chamber 10. To synchronize the rotation of the first spiral stirring shaft 11 and the second spiral stirring shaft 24, a linkage assembly for driving the rotation of the first spiral stirring shaft 11 and the second spiral stirring shaft 24 is provided at one end of the combustion chamber 3. In a preferred embodiment, the linkage assembly includes a rotating shaft 17 rotatably mounted at one end of each of the two combustion chambers 3. One end of the first spiral stirring shaft 11 extends to the outside of the combustion chamber 3 and is equipped with a worm gear 12. The end of the rotating shaft 17 is equipped with a worm 18 that meshes with the worm gear 12. A bevel gear 19 is provided at one end, and a telescopic universal joint 20 is provided at the bottom of the second spiral stirring shaft 24 extending to the bottom of the swing plate 21. The lower end of the telescopic universal joint 20 is provided with a second bevel gear 40 that meshes with the bevel gear 19. The telescopic universal joint 20 can easily drive the second spiral stirring shaft 24 to rotate, and can also realize the swing of the second spiral stirring shaft 24 without affecting its rotation. The rotating shaft 17 and the worm gear 12 are both located inside a protective housing. The lower end of the telescopic universal joint 20 is rotatably connected to the housing through a bearing. One end of the housing is provided with a first reduction motor 13 for driving the rotating shaft 17 to rotate.

[0042] To facilitate preliminary treatment of the flue gas discharged from the carbonization box 10, a filter box 5 is installed on one side of the storage chamber 2. A filter screen 36 is installed inside the filter box 5. A condenser 6 is connected to one end of the filter box 5. The gap between the combustion box 3 and the carbonization box 10 is connected to the filter box 5 via a flue gas pipe 33. To clean the filter screen 36 at the end of the operation, a pressure box 34 is connected to the upper end of the filter box 5. A thermal expansion and contraction component 38 is installed inside the pressure box 34. Preferably, a bimetallic strip is used. The bottom of the thermal expansion and contraction component 38 is provided with a brush holder 37 corresponding to one side of the filter screen 36. One end of the first hot air exhaust pipe 14 is connected to the pressure box 34. The side of the pressure box 34 is connected to a second hot air exhaust pipe 35. The thermal expansion and contraction component 38 bends when heated, thereby driving the brush holder 37 to move. When the work is finished, it can be cooled and reset. Then, the filter screen 36 is cleaned through the brush holder 37. The cleaned impurities can be discharged downwards and connected to a special collection device for collection. It can be removed and cleaned periodically.

[0043] The present invention also relates to an embodiment, specifically a method for the carbonization and recycling of straw, implemented using the aforementioned straw carbonization and recycling device, comprising the following steps:

[0044] Step 1: The straw is fed into the crushing device 1 for crushing. After crushing, it falls into the storage chamber 2 for storage. While one carbonization box 10 is carbonizing, the other carbonization box 10 is discharged and fed. During the discharge, the hot air generated by the combustion box 3 during the carbonization process heats the straw in the storage chamber 2.

[0045] Step 2: After one of the carbonization boxes 10 finishes discharging, the swing plate 21 drives the second through hole 30 to swing to the feeding pipe 8 corresponding to the carbonization box 10 for feeding. After feeding, both carbonization boxes 10 are in the carbonization stage, and the crushing device 1 continues to crush. During this period, the hot air generated by the two combustion boxes 3 preheats the straw in the storage chamber 2.

[0046] Step 3: Subsequently, the carbonization box 10, which is carbonized first, finishes carbonization and discharges the straw. During the discharge, the hot air generated by the combustion box 3, which is carbonizing, continues to preheat the straw in the storage chamber 2. After the discharge is completed, the straw is fed back in. Then the two carbonization boxes 10 enter the carbonization overlap period again. The crushing device 1 continues to crush the straw, and the hot air generated by the two combustion boxes 3 preheats the straw in the storage chamber 2. This process is repeated.

[0047] Step 4: The carbonized material is discharged into the compaction device 4 for compaction and extrusion.

[0048] Detailed working principle: Initially, the second spiral stirring shaft 24 is located in the middle of the storage chamber 2, the second through hole 30 is located between the two feeding pipes 8, and the two ends of the swing plate 21 are blocked from the two first through holes 15. The straw is added to the crushing device 1 for crushing, and after crushing, it falls into the storage chamber 2. Since the two carbonization boxes 10 are not working, the straw stored in the storage chamber 2 cannot be preheated by the hot air of the combustion box 3. When it is necessary to feed one of the carbonization boxes 10, the second reduction motor 23 drives the gear 29 to rotate. The gear 29 drives the swing plate 21 to swing towards the side of the carbonization box 10 that needs to be fed through the rack 22. The second spiral stirring shaft 24 swings with the swing plate 21 until the second through hole 30 is connected to the feeding pipe that needs to be fed. 8. Due to the presence of a telescopic universal joint 20 at the bottom of one of the second spiral stirring shafts 24, the second spiral stirring shaft 24 and the second bevel gear 40 can extend and retract. During this time, the first reduction motor 13 drives the rotating shaft 17 to rotate, which in turn drives the bevel gear 19 to rotate. The bevel gear 19, through the second bevel gear 40 and the telescopic universal joint 20, drives the second spiral stirring shaft 24 to rotate. The second spiral stirring shaft 24 can rotate through the synchronous pulley 31 and the synchronous belt 32, thus accelerating the feeding of material to the carbonization box 10. After feeding is completed, the swing plate 21 drives the second through hole 30 and the second spiral stirring shaft 24 to swing back to their original positions, and the feeding pipe 8 is blocked. At this time, the burner 9 starts carbonization. The crushing device 1 continues crushing, and the hot air generated in the combustion chamber 3, which is in the carbonization operation, enters the preheating chamber 25 through the first hot air exhaust pipe 14, thereby preheating and drying the straw in the storage chamber 2. After a certain period of preheating and drying, the swing plate 21 swings to one side of the other idle carbonization chamber 10, thereby realizing the feeding. Subsequently, the carbonization chamber 10 also enters the carbonization state, and the crushing device 1 continues crushing. The hot air generated by both combustion chambers 3 preheats the straw in the storage chamber 2. Afterwards, the carbonization of the first carbonization chamber 10 ends, and the corresponding discharge pipe 7 is opened. The first spiral stirring shaft 11 can input the carbonized material into the compaction device 4 for compaction and extrusion. During this discharge, the hot air in the other combustion chamber 3 preheats the straw in the storage chamber 2. After discharge, the material is fed. The carbonization box 10 enters the carbonization overlap period, and the crushing device 1 continues crushing. The hot air generated in the two combustion boxes 3 preheats the straw in the storage chamber 2. Then, one of the carbonization boxes 10, which has been carbonized first, finishes carbonization and discharges the straw. During the discharge, only the hot air generated by the combustion box 3, which is in operation, preheats the straw in the storage chamber 2. After the discharge, the straw is fed in, and then the carbonization overlap period of the two carbonization boxes 10 continues. This process repeats. During this period, the worm gear 18 drives the worm wheel 12 to rotate, and the worm wheel 12 drives the first spiral stirring shaft 11 to rotate. The first spiral stirring shaft 11 continuously stirs and conveys the material in the carbonization box 10. During this period, the flue gas generated in the carbonization box 10 enters the filter box 5 through the flue gas pipe 33, pre-filters large particles through the filter screen 36, and then enters the condenser 6 for condensation.Thereby, a mixture of liquid tar and wood vinegar is produced. After the waste gas is discharged, it can be externally connected to a waste gas treatment and purification device for further treatment. The hot gas entering the preheating chamber 25 is discharged through the hot gas inlet pipe 39, enters the pressure box 34, heats the thermal expansion and contraction part 38, and then is discharged through the second hot gas discharge pipe 35. The heated thermal expansion and contraction part 38 is a bimetallic sheet. Furthermore, the thermal expansion and contraction part 38 bends to one side, thereby driving the brush bar holder 37 to move up or down. When the temperature drops and resets at the end of the carbonization operation, the impurities attached to the filter net 36 during carbonization can be scraped and cleaned.

[0049] It should be noted that according to the above working principle, except for the irregular preheating of the straw at the beginning, the subsequent preheating time of the straw is almost stable, which is approximately the overlapping carbonization time of two carbonization boxes 10 plus the discharging time of one of the carbonization boxes 10. The specific derivation is as follows:

[0050] First, clarify the core time parameters of the scheme: In the following content, device A is one of the carbonization boxes 10, and device B is the other carbonization box 10. Let the complete carbonization time of a single carbonization device be T, the single feeding time be t1, and the single discharging time be t2. The carbonization time is greater than the sum of the feeding and discharging times. Therefore, T > t1 + t2. The operation sequence of the double carbonization boxes 10 is "Device A starts carbonization first. After an interval of t1 + t2 (device B completes feeding + discharging), device B is started. After device A carbonizes for a duration of T, it completes carbonization and enters the discharging stage". At this time, the carbonization duration of device B is the overlapping period duration T1 of the double carbonization boxes 10. From the sequence relationship, it can be obtained that T1 = T - (t1 + t2) (because device B starts t1 + t2 later. When device A completes carbonization, the carbonization duration of device B is T - (t1 + t2)).

[0051] Combined with the rule that each carbonization box 10 discharges materials before feeding, after a batch of straw falls into the storage chamber 2, it needs to experience the "overlapping period T1 of synchronous carbonization of device A and B" (during this stage, the double carbonization boxes 10 continuously produce hot gas and the straw is continuously preheated). When device A enters the discharging stage (duration t2), device B is still in the carbonization state (continuously producing hot gas and the straw continues to be preheated) until device A finishes discharging. Only then is this batch of straw fed into device A. Therefore, the preheating duration of a round of straw is the overlapping period duration T1 of the double carbonization boxes 10 plus the discharging duration t2 of device A (or the discharging duration t2 of device B). Substituting T1 = T - (t1 + t2) gives: Preheating duration = T - (t1 + t2) + t2 = T - t1.

[0052] Furthermore, compare the overlapping period duration + discharging duration with the complete carbonization duration T of one time: Since t1 is a positive value, T - t1 < T, that is, T > t1 + t2. From this, it can be deduced that: The preheating duration of a round of straw is approximately the overlapping period duration of the double carbonization boxes 10 plus the discharging duration of one of the carbonization boxes 10, and the complete carbonization duration of a single carbonization box 10 is greater than this total duration, thereby avoiding over-preheating.

[0053] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A straw carbonization and recycling device, characterized in that, The device includes a crushing device, with combustion chambers on both sides below the crushing device. A carbonization chamber is installed inside the combustion chamber. A compaction device is installed below the two combustion chambers. A gap is provided between the combustion chambers and the carbonization chambers. A burner corresponding to the gap is installed on the combustion chamber. A discharge pipe connected to the feed inlet of the compaction device is provided at one end of the carbonization chamber. A storage chamber is provided at the lower end of the crushing device. A feed pipe connected to the storage chamber is provided at one end of the carbonization chamber. A preheating chamber is provided around the lower end of the storage chamber. The carbonization chamber and the preheating chamber are connected by a hot gas inlet pipe. The bottom of the storage cavity is arc-shaped, and a swing groove is provided on the inner side of the bottom of the storage cavity. An arc-shaped swing plate is movably provided on the inner side of the swing groove. One end of the swing plate is provided with a second through hole that matches the feeding pipe. When the second through hole matches the feeding pipe, the carbonization box is connected to the storage cavity. The storage cavity is rotatably provided with a second spiral stirring shaft corresponding to the second through hole in the middle of its inner side, and the second spiral stirring shaft can swing with the swing plate. There are two second spiral stirring shafts. The two second spiral stirring shafts rotate synchronously through a synchronization component. One of the second spiral stirring shafts corresponds to the second through hole, and the lower end of the other second spiral stirring shaft extends downward through the swing plate. The synchronization component includes a connecting seat located at the upper inner side of the storage cavity, two second spiral stirring shafts extending to the inner side of the connecting seat and equipped with synchronization wheels, the two synchronization wheels being connected by a synchronization belt, and a mounting frame installed at the upper inner side of the storage cavity. The connecting seat and the mounting frame are rotatably connected, and the axis of the rotatable connection coincides with the axis of the swing plate.

2. The straw carbonization and recycling device according to claim 1, characterized in that: A first spiral stirring shaft is rotatably installed in the middle of the inner side of the carbonization box.

3. The straw carbonization and recycling device according to claim 2, characterized in that: One end of the combustion chamber is provided with a linkage assembly for driving the first and second spiral stirring shafts to rotate. The linkage assembly includes a rotating shaft rotatably disposed at one end of the two combustion chambers. One end of the first spiral stirring shaft extends to the outside of the combustion chamber and is provided with a worm gear. The end of the rotating shaft is provided with a worm gear that meshes with the worm gear. One end of the rotating shaft is provided with a bevel gear. The bottom of the second spiral stirring shaft, which extends to the bottom of the swing plate, is provided with a telescopic universal joint. The lower end of the telescopic universal joint is provided with a second bevel gear that meshes with the bevel gear. One end of the combustion chamber is provided with a first reduction motor for driving the rotating shafts to rotate.

4. The straw carbonization and recycling device according to claim 1, characterized in that: The bottom of the storage cavity is provided with a drive assembly for driving the swing plate to swing back and forth. The drive assembly includes a second geared motor installed at one end of the bottom of the storage cavity. One end of the bottom of the storage cavity is provided with a clearance groove corresponding to the second spiral stirring shaft away from the second through hole. A rack is uniformly provided at one end of the bottom of the swing plate. The output end of the second geared motor is provided with a gear that meshes with the rack and is driven to rotate by the second geared motor.

5. The straw carbonization and recycling device according to claim 1, characterized in that: A first hot air pipe communicating with the preheating chamber is provided on one side of the storage cavity.

6. The straw carbonization and recycling device according to claim 5, characterized in that: A filter box is provided on one side of the storage chamber, and a filter screen is provided inside the filter box. A condenser is connected to one end of the filter box. The gap between the combustion chamber and the carbonization chamber is connected to the filter box through a flue gas pipe.

7. The straw carbonization and recycling device according to claim 6, characterized in that: A pressure box is connected to the upper end of the filter box. A thermal expansion and contraction component is provided inside the pressure box. A brush strip frame corresponding to one side of the filter screen is provided at the bottom of the thermal expansion and contraction component. One end of the first hot air pipe is connected to the pressure box, and a second hot air pipe is connected to the side of the pressure box.

8. The straw carbonization and recycling device according to claim 7, characterized in that: The thermal expansion and contraction component is a bimetallic strip.

9. A method for the carbonization and recycling of straw, implemented using the straw carbonization and recycling device according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Straw is fed into the crushing device for crushing. After crushing, it falls into the storage chamber for storage. While one carbonization box is carbonizing, the other carbonization box is discharged and fed. During the discharge, the hot air generated by the combustion box during the carbonization process heats the straw in the storage chamber. S2: After one of the carbonization boxes finishes discharging, the swing plate drives the second through hole to swing to the feeding pipe corresponding to the carbonization box for feeding. After feeding, both carbonization boxes are in the carbonization stage, and the crushing device continues to crush. During this period, the hot air generated by the two combustion boxes preheats the straw in the storage chamber. S3: Subsequently, the carbonization box that was carbonized first finishes carbonization and discharges the material. During the discharge, the hot air generated by the combustion box that is carbonizing continues to preheat the straw in the storage chamber. After the discharge is completed, the material is fed in. Then the two carbonization boxes enter the carbonization overlap period again. The crushing device continues to crush the straw. The hot air generated by the two combustion boxes preheats the straw in the storage chamber. This process is repeated. S4: The carbonized material is discharged into the compaction device for compaction and extrusion.

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