Biomass fuel high-efficiency drying device

Abstract

The application provides a biomass fuel efficient drying device, and relates to the technical field of biomass fuel production devices.The device comprises a mounting rack, a crushing bin, a pre-drying bin and a hot drying bin are sequentially fixed and communicated on the mounting rack from top to bottom; a crushing roller is oppositely arranged in the crushing bin; a pre-drying channel is vertically arranged in the pre-drying bin, an air outlet is arranged on the side wall of the pre-drying channel, and the air outlet is communicated with the hot drying bin; a dedusting cylinder is obliquely arranged in the hot drying bin, a plurality of dedusting holes are uniformly arranged on the dedusting cylinder, a heat source is arranged around the hot drying bin, and the heat source is used for heating the dedusting cylinder; the heat source is arranged around the dedusting cylinder to heat the dedusting cylinder, so that the heat directly acts on the dedusting cylinder in a radiation or convection mode, the heat transfer path is shortened, the material is preheated through the pre-drying channel, the waste heat is recycled, the problems of large heat loss, low heat transfer efficiency, uneven heating of the inner and outer layers of the material and influence on the final drying effect of the existing device are solved.

Description

Technical Field

[0001] This invention relates to the field of biomass fuel production equipment technology, and in particular to a high-efficiency biomass fuel drying device. Background Technology

[0002] Biomass fuel is a renewable energy product made from agricultural and forestry waste such as straw, wood chips, fruit shells, and branches through crushing, drying, and compression molding processes. It has advantages such as clean combustion, low carbon emissions, and full utilization of resources. Among these processes, the drying process is a key step, aiming to precisely reduce the moisture content of the raw materials to a suitable range for compression, which directly determines the molding quality of the subsequent products.

[0003] Chinese invention patent CN121669357A, published in the prior art, provides a biomass fuel raw material processing production line and processing technology. It includes a crushing component and a drying drum installed at the bottom of the crushing component. The drying drum contains a drive component for moving the raw material, and a heating component is also installed at the bottom of the drying drum. By directly installing the crushing component on the top of the drying drum, a compact, integrated structure is formed. However, this structure still has shortcomings in practical applications: its heating nozzle is located at the bottom of the drying drum, and only a small portion of the output heat is absorbed by the drum wall and conducted to the interior, resulting in significant heat loss and low heat transfer efficiency. Simultaneously, the material inside the drying drum is propelled axially by the driven screw, easily forming a tight accumulation within the spiral channel. It is difficult for the inner and outer layers of material to effectively tumble or exchange positions, leading to uneven heating of the inner and outer materials and affecting the final drying effect. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-efficiency biomass fuel drying device, which solves the problems of large heat loss, low heat transfer efficiency, uneven heating of inner and outer materials, and the impact on the final drying effect of existing devices.

[0005] According to an embodiment of the present invention, a high-efficiency biomass fuel drying device includes a mounting frame, on which a crushing chamber, a pre-drying chamber and a hot drying chamber are fixedly and connected from top to bottom;

[0006] The top of the crushing chamber is equipped with a feed inlet, and the crushing rollers are arranged to rotate relative to each other inside the crushing chamber. A first motor that can drive the two crushing rollers to rotate relative to each other is fixedly installed on one side of the crushing chamber.

[0007] A pre-drying channel is vertically arranged inside the pre-drying chamber, and an air outlet is provided on the side wall of the pre-drying channel, which is connected to the hot drying chamber.

[0008] An impurity removal cylinder is tilted and rotated inside the hot drying chamber. Several impurity removal holes are evenly arranged on the impurity removal cylinder. A feed inlet is connected to the higher end of the impurity removal cylinder, which is connected to the bottom of the pre-drying channel. A discharge outlet is connected to the lower end of the impurity removal cylinder. A heat source is arranged around the hot drying chamber to heat the impurity removal cylinder. A second motor that can drive the impurity removal cylinder to rotate is fixedly installed on the outside of the hot drying chamber.

[0009] The technical principle of this invention is as follows: In use, the raw material is fed into the crushing chamber through the feed inlet. The first motor drives two crushing rollers to rotate relative to each other to crush the raw material. The crushed material falls into the pre-drying channel of the pre-drying chamber and moves downward along the pre-drying channel under the action of gravity. At this time, the heat generated by the heat source in the hot drying chamber enters the pre-drying channel through the air outlet to preheat the falling material. The material then enters the inclined impurity removal cylinder. The second motor drives the impurity removal cylinder to rotate. The material rotates with the cylinder and moves towards the lower end along the inclined direction. The heat source arranged around the hot drying chamber heats the rotating impurity removal cylinder. The heat is evenly transferred to the material in the cylinder through the impurity removal holes to achieve full drying of the material. At the same time, the fine impurities mixed in the material are screened out through the impurity removal holes during the rotation. The dried material is finally discharged from the discharge port.

[0010] Furthermore, the two crushing rollers are fixedly surrounded by crushing toothed rings, and adjacent crushing toothed rings on different crushing rollers are staggered, with a number of teeth evenly fixed on the crushing toothed rings.

[0011] Furthermore, the two crushing rollers are respectively coaxially fixed on the same side with a drive gear and a driven gear that mesh with each other, and the output end of the first motor is coaxially fixed with the drive gear.

[0012] Furthermore, the air outlet includes an air outlet cavity and several air outlet holes. The air outlet cavity is connected to the hot drying chamber through an air supply pipe, and the air outlet holes are connected to the air outlet cavity and the pre-drying channel. A filter plate is fixedly installed inside the air outlet holes.

[0013] Furthermore, the heat source includes a radiant heating element or a convection heating element;

[0014] The radiant heating assembly includes a plurality of radiant heating elements arranged at intervals along the circumference of the hot drying chamber. The radiant heating elements are fixed to the inner wall of the hot drying chamber and their radiating surfaces face the impurity removal cylinder.

[0015] The convection heating assembly includes an air supply structure surrounding the impurity removal cylinder. The air supply structure is connected to an external hot air source and is used to introduce hot air into the hot drying chamber.

[0016] Furthermore, the radiant heating element includes at least one of the following: far-infrared heating tube, carbon fiber quartz heating tube, ceramic infrared heating plate, and metal electric heating tube.

[0017] Furthermore, the air supply structure includes an air supply pipe and several ring pipes connected to the air supply pipe. Each ring pipe is arranged around the periphery of the impurity removal cylinder, and several air nozzles are connected to the inner side of the ring pipes. The air nozzles are arranged at intervals along the circumference of the ring pipes.

[0018] Furthermore, a bulk material bin is provided between the crushing bin and the pre-drying bin. A bulk material rack is rotatably installed inside the bulk material bin. The bulk material rack includes a bulk material shaft rotatably installed below the crushing roller and a bulk material rod uniformly fixed on the bulk material shaft. A bulk material plate is fixedly installed at the end of the bulk material rod. A bulk material head is fixedly installed on the bulk material plate facing the rotating side. A third motor that can drive the bulk material rack to rotate is fixedly installed on one side of the bulk material bin.

[0019] Furthermore, a sweeping plate is fixedly installed on the bulk material shaft. The end of the sweeping plate slides against the inner wall of the bulk material bin, and the sweeping plate has an arc-shaped sweeping concave surface on the side facing the rotation direction.

[0020] Furthermore, a bevel gear ring is fixedly provided at one end of the impurity removal cylinder, and a bevel gear is fixedly provided at the output end of the second motor, with the bevel gear meshing with the bevel gear ring.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By surrounding the heat source within the drying chamber and heating the rotating impurity removal cylinder, heat is directly applied to the cylinder via radiation or convection, significantly shortening the heat transfer path, reducing heat loss, and improving heat transfer efficiency.

[0023] 2. By setting up an inclined rotating impurity removal cylinder and evenly opening impurity removal holes on the cylinder wall, the material continuously tumbles and falls as the cylinder rotates, realizing full exchange and positional replacement of the material between the inner and outer layers, avoiding uneven heating caused by material accumulation, and ensuring the consistency of the drying degree of the material in each part.

[0024] 3. By setting up a pre-drying chamber between the crushing chamber and the hot drying chamber, and setting an air outlet connected to the hot drying chamber on the side wall of the pre-drying channel, the hot airflow in the hot drying chamber can enter the pre-drying channel upwards to preheat the falling material. This not only realizes the recovery and utilization of waste heat, but also ensures that the material has a certain temperature before entering the main drying area, thus shortening the subsequent drying time.

[0025] 4. The impurity removal holes allow for simultaneous screening of impurities during the tumbling and drying process, effectively reducing the ash and hard particle content in the finished fuel and improving the calorific value and quality of the biomass fuel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the half-section structure of the crushing chamber, bulk material chamber and pre-drying chamber in an embodiment of the present invention.

[0028] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0029] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B.

[0030] Figure 5 for Figure 2 Enlarged schematic diagram of the structure at point C.

[0031] Figure 6 This is a schematic diagram of the cross-sectional assembly structure of the hot drying chamber according to an embodiment of the present invention.

[0032] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point D.

[0033] Figure 8 This is a schematic diagram of a half-section of the hot drying chamber according to an embodiment of the present invention.

[0034] Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point E in the middle.

[0035] Figure 10 This is a schematic diagram of the air supply structure according to an embodiment of the present invention.

[0036] In the above attached diagrams: 1. Crushing chamber; 11. Feed inlet; 12. Crushing roller; 121. Crushing toothed ring; 122. Tooth head; 13. First motor; 14. Material retaining edge; 2. Pre-drying chamber; 21. Pre-drying channel; 22. Air outlet; 221. Air outlet hole; 23. Filter plate; 231. Filter hole; 3. Hot drying chamber; 31. Feed inlet; 32. Discharge outlet; 33. Impurity removal trough; 331. Impurity removal port; 34. Second motor; 341. Bevel gear; 4. Impurity removal cylinder; 41. 42. Impurity removal hole; 5. Bevel tooth ring; 5. Heat source; 51. Radiant heating element; 52. Air supply pipe; 53. Ring pipe; 531. Air nozzle; 6. Air supply source; 61. Air conveying pipe; 7. Bulk material bin; 71. Bulk material rack; 711. Bulk material shaft; 712. Bulk material rod; 713. Bulk material plate; 714. Bulk material head; 72. Sweeping plate; 721. Sweeping concave surface; 722. Connecting rod; 73. Third motor; 8. Conveying mechanism; 81. Screw conveyor; 82. Conveying motor. Detailed Implementation

[0037] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1-10As shown in the figure, this embodiment of the invention proposes a high-efficiency drying device for biomass fuel, which includes an installation frame. The installation frame serves as the installation carrier of this device and includes a double-layer structure made of several steel materials and steel plates fixedly connected together. From top to bottom, a crushing chamber 1, a pre-drying chamber 2, and a hot drying chamber 3 are fixedly arranged on the frame, and the three are connected in sequence so that the raw materials can be processed in the order of processing.

[0039] In this exemplary embodiment, the crushing chamber 1 is fixedly installed on the top of the mounting frame. A material receiving port 11 is provided at the center of the top of the crushing chamber 1. The material receiving port 11 is preferably configured as a funnel-shaped structure with a larger top and a smaller bottom to guide the raw material to fall smoothly into the chamber. A pair of crushing rollers 12 are horizontally and rotatably arranged inside the crushing chamber 1. The two ends of the roller shafts of the two crushing rollers 12 are rotatably supported on the front and rear side walls of the crushing chamber 1 by bearing seats. A number of crushing teeth can be selectively and evenly arranged axially on the roller surface of the two crushing rollers 12, and the adjacent crushing teeth are staggered to shear the raw material falling between the two rollers. A first motor 13 is fixedly installed on one side of the crushing chamber 1. The output shaft of the first motor 13 is connected to the roller shaft of one of the crushing rollers 12 through a reducer. The two crushing rollers 12 are driven to rotate relative to each other by a transmission mechanism. The transmission mechanism includes, but is not limited to, meshing transmission gears, sprocket and chain assemblies or synchronous belt pulley assemblies. This part is a very mature prior art and can be flexibly configured according to actual transmission needs, and will not be described in detail here.

[0040] In this exemplary embodiment, the pre-drying chamber 2 is fixedly connected to the bottom of the crushing chamber 1. A vertically extending pre-drying channel 21 is provided in the pre-drying chamber 2. The cross-section of the pre-drying channel 21 includes, but is not limited to, a rectangle, a circle, or other conventional shapes. Its upper end is directly connected to the bottom discharge port of the crushing chamber 1 to receive the material falling after crushing. An air outlet 22 is provided on the side wall of the pre-drying channel 21. The air outlet 22 includes several through holes or elongated grids evenly distributed along the side wall. The air outlet 22 is connected to the internal space of the hot drying chamber 3 through a pipe, so that the hot airflow in the hot drying chamber 3 can enter the pre-drying channel 21 through the air outlet 22 to blow away and preheat the material falling freely along the channel. At the same time, the agglomerated material will hit the bottom and break up under the action of gravity, providing basic conditions for further drying of the material.

[0041] In this exemplary embodiment, the hot drying chamber 3 is connected to the pre-drying chamber 2 via the conveying mechanism 8. The hot drying chamber 3 is fixedly connected below the pre-drying chamber 2. Specifically, the conveying mechanism 8 can be a screw conveyor 81. The screw conveyor 81 is inclinedly arranged between the pre-drying chamber 2 and the hot drying chamber 3. The screw conveyor 81 includes a conveying housing, a screw blade rotatably arranged inside the conveying housing, and a conveying motor 82 fixedly arranged at one end of the conveying housing. The output end of the conveying motor 82 is connected to the screw blade for transmission. The feed end of the screw conveyor 81 is sealed and connected to the discharge end of the pre-drying chamber 2. The discharge end of the screw conveyor 81 is connected to the feed end of the hot drying chamber 3. When the conveying motor 82 drives the screw blade to rotate, it forcibly pushes the material in the pre-drying chamber 2 into the impurity removal cylinder 4, thereby realizing continuous and stable material conveying.

[0042] Furthermore, the interior of the hot drying chamber 3 forms a closed drying chamber. An inclined, rotating impurity removal cylinder 4 is installed inside the hot drying chamber 3. The cylinder wall of the impurity removal cylinder 4 is cylindrical, and multiple impurity removal holes 41 are evenly distributed on the cylinder wall. These holes 41 penetrate the cylinder wall and are used to screen out fine impurities during material tumbling, improving the uniformity and forming quality of the material. A feed inlet 31 is located at the higher end of the impurity removal cylinder 4. One end of the feed inlet 31 is connected to the discharge end of the screw conveyor 81, and the other end extends towards the opening of the impurity removal cylinder 4 to ensure that the material can completely enter the impurity removal cylinder 4. A discharge outlet 32 ​​is connected to the lower end of the impurity removal cylinder 4 and extends to the outside of the hot drying chamber 3. Supporting rollers are fitted at both ends of the outer cylinder wall of the impurity removal cylinder 4. Multiple corresponding support rollers are installed on the inner wall of the hot drying chamber 3. A roller supports the impurity removal cylinder 4, which is rotatably supported inside the hot drying chamber 3 by the cooperation of the support roller and the roller. The hot drying chamber 3 has an inclined impurity removal groove 33 at the bottom, and an impurity removal port 331 at the lower end of the impurity removal groove 33 for impurity discharge. A heat source 5 is arranged around the inside of the hot drying chamber 3. The heat source 5 extends along the axial direction of the impurity removal cylinder 4 or is arranged around it to radiate or conduct heat to the impurity removal cylinder 4. A second motor 34 is fixedly installed on the outside of the hot drying chamber 3 to drive the impurity removal cylinder 4 to rotate around its axis. Specifically, a bevel gear ring 42 is fixedly installed at one end of the impurity removal cylinder 4. The bevel gear ring 42 is fixedly connected around the outer wall of the impurity removal cylinder 4. The output end of the second motor 34 extends into the hot drying chamber 3 and is fixedly installed with a bevel gear 341. The bevel gear 341 meshes with the bevel gear ring 42.

[0043] The technical principle of this invention is as follows: In use, the raw material is fed into the crushing chamber 1 through the feed inlet 31. The first motor 13 drives the two crushing rollers 12 to rotate relative to each other to crush the raw material. The crushed material falls into the pre-drying channel 21 of the pre-drying chamber 2 and moves downward along the pre-drying channel 21 under the action of gravity. At this time, the heat generated by the heat source 5 in the hot drying chamber 3 enters the pre-drying channel 21 through the air outlet 22 to preheat the falling material. The material then enters the inclined impurity removal cylinder 4. The second motor 34 drives the impurity removal cylinder 4 to rotate. The material rotates with the cylinder in the impurity removal cylinder 4 and moves towards the lower end along the inclined direction. The heat source 5 arranged around the hot drying chamber 3 heats the rotating impurity removal cylinder 4. The heat is evenly transferred to the material in the cylinder through the impurity removal hole 41 to achieve full drying of the material. At the same time, the fine impurities mixed in the material are screened out through the impurity removal hole 41 during the rotation. The dried material is finally discharged from the discharge port 32.

[0044] This invention heats the rotating impurity removal cylinder 4 by surrounding the heat source 5 within the drying chamber 3, allowing heat to directly act on the surface of the cylinder 4 via radiation or convection. This significantly shortens the heat transfer path, reduces heat loss, and improves heat transfer efficiency. By using an inclined rotating impurity removal cylinder 4 with uniformly distributed impurity removal holes 41 on the cylinder wall, the material continuously tumbles and falls as the cylinder rotates, achieving full exchange and positional replacement of materials between the inner and outer layers. This avoids uneven heating caused by material accumulation and ensures consistent drying levels across all parts of the material. Furthermore, by using a crushing... A pre-drying chamber 2 is set between chamber 1 and the hot drying chamber 3, and an air outlet 22 connected to the hot drying chamber 3 is set on the side wall of the pre-drying channel 21, so that the hot air flow in the hot drying chamber 3 can enter the pre-drying channel 21 upward to preheat the falling material. This not only realizes the recovery and utilization of waste heat, but also ensures that the material has a certain temperature before entering the main drying area, shortening the subsequent drying time. In addition, the impurity removal hole 41 allows the material to complete the impurity removal simultaneously during the tumbling drying process, effectively reducing the ash and hard particle content in the finished fuel, and improving the calorific value and finished product quality of biomass fuel.

[0045] like Figure 1-3As shown, according to another embodiment, two crushing rollers 12 are surrounded by crushing toothed rings 121. Adjacent crushing toothed rings 121 on different crushing rollers 12 are staggered. A plurality of teeth 122 are uniformly fixed on the crushing toothed rings 121. The size, quantity, shape and spacing of the crushing toothed rings 121 and the teeth 122 can be flexibly selected according to the actual crushing requirements, and are not specifically limited here. After the two crushing rollers 12 are assembled, the crushing toothed ring 121 on one crushing roller 12 and the crushing toothed ring 122 on the other crushing roller 12 are connected. The roller surfaces of rollers 12 are fitted with a clearance, and the adjacent crushing tooth rings 121 are also fitted with a clearance to prevent interference during operation. Several baffles 14 are fixedly arranged at equal intervals along the horizontal direction on the inner side of both sides of the crushing chamber 1. The gap between adjacent baffles 14 allows the crushing tooth rings 121 to be embedded. The baffles 14 and the crushing tooth rings 121 are also fitted with a clearance to prevent material from leaking out from both sides of the crushing rollers 12 during the crushing process, ensuring that the material is effectively confined within the biting area of ​​the two crushing rollers 12 for crushing.

[0046] like Figure 1-3 As shown, in this embodiment, the two crushing rollers 12 are respectively coaxially fixedly provided with a driving gear and a driven gear on the same side. The tooth profile parameters of the two gears are matched to ensure meshing accuracy. The first motor 13 is fixedly installed on the mounting base on one side of the crushing chamber 1. The output shaft of the first motor 13 is coaxially fixedly connected to the end of the roller shaft of the crushing roller 12 where the driving gear is located through a coupling. When the first motor 13 starts, it directly drives the crushing roller 12 to rotate, and through the meshing transmission of the driving gear and the driven gear, it causes the other crushing roller 12 to rotate synchronously in the opposite direction, thereby realizing the relative rotation of the two crushing rollers 12.

[0047] like Figure 1-2 and Figure 5As shown, according to another embodiment, the air outlet 22 includes an air outlet cavity and a plurality of air outlet holes 221. The air outlet cavity is hollow and disposed inside or outside the side wall of the pre-drying channel 21. The air outlet cavity is connected to the hot drying chamber 3 through an air supply pipe 61. An air supply source 6 is provided on the air supply pipe 61. The air supply source 6 includes, but is not limited to, a fan, an air pump, or other air supply mechanism, which is used to force the hot airflow in the hot drying chamber 3 to be transported into the air outlet cavity. The air outlet holes 221 are disposed on the side wall of the pre-drying channel 21 and connect the air outlet cavity and the pre-drying channel 21. The shape of the air outlet holes 221 includes, but is not limited to, a circle. The pre-drying channel 21 has holes, rectangular holes, elongated holes, or a grid-like structure, with a filter plate 23 fixedly installed inside each hole. The filter plate 23 has several filter holes 231 with a diameter smaller than the particle size of the material, which is used to prevent the material from entering the air outlet cavity through the air outlet hole 221. In addition, the upper part of the pre-drying channel 21 should also be provided with an air outlet according to the actual situation. The air outlet is connected to the interior of the pre-drying channel 21, and the air outlet is connected to an exhaust gas treatment mechanism or a waste heat recovery mechanism to export the hot air flowing through the pre-drying channel 21 for purification or recycling, thereby forming a complete hot air circulation path.

[0048] like Figure 1 and Figure 6-10 As shown, according to another embodiment, the heat source 5 includes a radiant heating component or a convection heating component; specifically, the radiant heating component includes a plurality of radiant heating elements 51 arranged at intervals along the circumference of the hot drying chamber 3. The radiant heating elements 51 are fixed to the inner wall of the hot drying chamber 3 by mounting brackets or clamps, and their radiant surfaces are all facing the impurity removal cylinder 4. The radiant heating elements 51 can be arranged to extend along the axial direction of the hot drying chamber 3 or to be arranged in multiple rings along the circumference according to the drying requirements, for directly heating the impurity removal cylinder 4 and its internal materials by thermal radiation; specifically, the radiant heating elements 51 include at least one of far-infrared heating tubes, carbon fiber quartz heating tubes, ceramic infrared heating plates, and metal electric heating tubes, which can generate infrared radiation or thermal radiation after being energized, thereby directly and uniformly heating the impurity removal cylinder 4 and its internal materials in a non-contact manner.

[0049] Furthermore, the convection heating assembly includes an air supply structure surrounding the impurity removal cylinder 4. This air supply structure is connected to an external hot air source and is used to uniformly introduce hot air into the heat drying chamber 3 and allow it to flow around the impurity removal cylinder 4, forming convective heat exchange. Specifically, the air supply structure includes an air supply pipe 52 and several annular pipes 53 connected to the air supply pipe 52. The air supply pipe 52 extends axially along the heat drying chamber 3 and is connected to an external hot air source. Each annular pipe 53 is arranged around the periphery of the impurity removal cylinder 4 and spaced apart axially along the heat drying chamber 3. Several air nozzles 531 are uniformly connected circumferentially on the inner side of each annular pipe 53. The outlet direction of each air nozzle 531 faces the surface of the impurity removal cylinder 4 or is arranged tangentially, used to uniformly spray hot air onto the surface of the impurity removal cylinder 4. The annular pipe 53 can be configured as a circular or spiral structure. The circular annular pipe 53 is arranged in layers along the axial direction of the hot drying chamber 3, while the spiral annular pipe 53 continuously surrounds the outer periphery of the impurity removal cylinder 4. Both structures can achieve uniform air supply to the impurity removal cylinder 4. The air nozzles 531 are evenly spaced along the circumference of the annular pipe 53. Their number and arrangement can be flexibly adjusted according to the actual drying requirements. The hot air blown out by the air nozzles 531 can convectively heat the material in the impurity removal cylinder 4 on the one hand, and blow out the material blocked in the impurity removal hole 41 in the opposite direction on the other hand, preventing the impurity removal hole 41 from being blocked. At the same time, it can disperse the material that has agglomerated due to moisture, keeping the material in a loose state in the cylinder, thereby improving the drying efficiency and ensuring the uniformity of the material being heated.

[0050] like Figure 1-4 As shown, according to another embodiment, a bulk material bin 7 is further provided between the crushing bin 1 and the pre-drying bin 2. The upper end of the bulk material bin 7 is connected to the bottom of the crushing bin 1, and the lower end of the bulk material bin 7 is connected to the top of the pre-drying bin 2. A bulk material rack 71 is rotatably arranged inside the bulk material bin 7. The bulk material rack 71 includes a bulk material shaft 711 rotatably arranged directly below the crushing roller 12 and bulk material rods 712 uniformly fixed on the bulk material shaft 711. The bulk material rods 712 are arranged in an equidistant array along the axial and circumferential directions of the bulk material shaft 711, and a bulk material plate 713 is fixedly provided at their ends. 13 extends axially along the bulk material shaft 711, so that the bulk material plate 713 can cover the entire feeding area when rotating. The bulk material plate 713 is fixedly provided with a bulk material head 714 facing the rotating side. The bulk material head 714 has a protruding arc surface structure and is used to beat and disperse the falling material when the bulk material plate 713 rotates with the bulk material shaft 711, thereby increasing the looseness of the material and providing good conditions for subsequent drying. A third motor 73 that can drive the bulk material rack 71 to rotate is fixedly provided on one side of the bulk material bin 7. The output end of the third motor 73 is fixedly connected to the bulk material shaft 711.

[0051] like Figure 1-4As shown, in this embodiment, a sweeping plate 72 is also fixedly installed on the bulk material shaft 711. The sweeping plate 72 is fixedly connected to the bulk material shaft 711 through a connecting rod 722. The sweeping plate 72 extends along the axial direction of the connecting rod 722 and its length matches the diameter of the bulk material bin 7, so that its end slides against the inner wall of the bulk material bin 7. It is used to scrape off the material adhering to the inner wall of the bulk material bin 7 when rotating with the bulk material shaft 711. The sweeping plate 72 is provided with an arc-shaped sweeping concave surface 721 on the side facing the rotation direction. The sweeping concave surface 721 extends along the length direction of the sweeping plate 72 and is used to gather and guide the material downward during the sweeping process to reduce the material residue on the bin wall.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-efficiency biomass fuel drying device, characterized in that: The equipment includes a mounting frame, on which a crushing chamber (1), a pre-drying chamber (2), and a hot drying chamber (3) are fixed and connected from top to bottom. The crushing chamber (1) is provided with a receiving port (11) at the top. The crushing chamber (1) is provided with crushing rollers (12) rotating relative to each other. A first motor (13) that can drive the two crushing rollers (12) to rotate relative to each other is fixedly provided on one side of the crushing chamber (1). A pre-drying channel (21) is vertically arranged inside the pre-drying chamber (2), and an air outlet (22) is provided on the side wall of the pre-drying channel (21). The air outlet (22) is connected to the hot drying chamber (3). The hot drying chamber (3) is equipped with an inclined rotating impurity removal cylinder (4). The impurity removal cylinder (4) is evenly provided with several impurity removal holes (41). The higher end of the impurity removal cylinder (4) is connected to the feed inlet (31), which is connected to the bottom of the pre-drying channel (21). The lower end of the impurity removal cylinder (4) is connected to the discharge outlet (32). The hot drying chamber (3) is surrounded by a heat source (5) for heating the impurity removal cylinder (4). A second motor (34) that can drive the impurity removal cylinder (4) to rotate is fixedly provided on the outside of the hot drying chamber (3).

2. The high-efficiency biomass fuel drying device as described in claim 1, characterized in that: The two crushing rollers (12) are fixedly surrounded by crushing toothed rings (121). Adjacent crushing toothed rings (121) on different crushing rollers (12) are staggered, and a number of teeth (122) are evenly fixed on the crushing toothed rings (121).

3. The high-efficiency biomass fuel drying device as described in claims 1-2, characterized in that: The two crushing rollers (12) are respectively coaxially fixed on the same side with a drive gear and a driven gear that mesh with each other, and the output end of the first motor (13) is coaxially fixed with the drive gear.

4. The high-efficiency biomass fuel drying device as described in claim 1, characterized in that: The air outlet (22) includes an air outlet cavity and several air outlet holes (221). The air outlet cavity is connected to the hot drying chamber (3) through an air supply pipe (61). The air outlet holes (221) are connected to the air outlet cavity and the pre-drying channel (21). A filter plate (23) is fixedly installed inside the air outlet holes (221).

5. The high-efficiency biomass fuel drying device as described in claim 1, characterized in that: The heat source (5) includes a radiant heating component or a convection heating component; The radiant heating assembly includes a plurality of radiant heating elements (51) arranged circumferentially along the hot drying chamber (3). The radiant heating elements (51) are fixed to the inner wall of the hot drying chamber (3) and their radiant surfaces face the impurity removal cylinder (4). The convection heating assembly includes an air supply structure surrounding the impurity removal cylinder (4), which is connected to an external hot air source and is used to introduce hot air into the hot drying chamber (3).

6. The high-efficiency biomass fuel drying device as described in claim 5, characterized in that: The radiant heating element (51) includes at least one of the following: far-infrared heating tube, carbon fiber quartz heating tube, ceramic infrared heating plate, and metal electric heating tube.

7. The high-efficiency biomass fuel drying device as described in claim 5, characterized in that: The air supply structure includes an air supply pipe (52) and several ring pipes (53) connected to the air supply pipe (52). Each ring pipe (53) is arranged around the periphery of the impurity removal cylinder (4). Several air nozzles (531) are connected to the inner side of the ring pipe (53). The air nozzles (531) are arranged at intervals along the circumference of the ring pipe (53).

8. The high-efficiency biomass fuel drying device as described in claim 1, characterized in that: A bulk material bin (7) is also provided between the crushing bin (1) and the pre-drying bin (2). A bulk material rack (71) is rotatably provided inside the bulk material bin (7). The bulk material rack (71) includes a bulk material shaft (711) rotatably provided below the crushing roller (12) and a bulk material rod (712) uniformly fixed on the bulk material shaft (711). A bulk material plate (713) is fixedly provided at the end of the bulk material rod (712). A bulk material head (714) is fixedly provided on the side of the bulk material plate (713) facing the rotation. A third motor (73) that can drive the bulk material rack (71) to rotate is fixedly provided on one side of the bulk material bin (7).

9. The high-efficiency biomass fuel drying device as described in claim 8, characterized in that: A sweeping plate (72) is also fixedly installed on the bulk shaft (711). The end of the sweeping plate (72) slides against the inner wall of the bulk bin (7). An arc-shaped sweeping concave surface (721) is provided on the side of the sweeping plate (72) facing the rotation direction.

10. The high-efficiency biomass fuel drying device as described in claim 1, characterized in that: One end of the impurity removal cylinder (4) is fixedly provided with a bevel gear ring (42), and the output end of the second motor (34) is fixedly provided with a bevel gear (341), which meshes with the bevel gear ring (42).

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