A drying device and processing method for producing biomass particles

Abstract

The present invention relates to the technical field of biomass pellet production, and in particular to a drying device and processing method for biomass pellet production, comprising a diffusion barrel, wherein a throwing mechanism is installed on all sides of the inner side of the diffusion barrel, a limiting mechanism is installed on one side of the diffusion barrel, an air duct is installed on the rear end of the diffusion barrel, an annular tube is installed on the bottom end of the air duct, the side of the annular tube is fixedly connected to a suction unit through a connecting pipe, an annular filter is installed inside the annular tube, a straight tube is installed at the bottom of the annular tube, a scraper is installed inside the annular filter, and the bottom of the straight tube is fixedly connected to a heating mechanism; the limiting mechanism comprises a fixed seat, a first rotating shaft is rotatably connected to the inside of one side of the upper end of the fixed seat through a first clockwork spring, and the other end of the first rotating shaft is fixedly connected to a bent rod. In the present invention, before drying the biomass pelletizing raw materials, the biomass pelletizing raw materials can be made into a fluffy state, thereby avoiding the problem that the biomass pelletizing raw materials are compressed together and cannot be dried inside.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass pellet production, and in particular to a drying device and a processing method for biomass pellet production. Background Art

[0002] The drying device used in the production process of biomass pellet raw materials is usually a specially designed device used to reduce the moisture content of the raw materials to a suitable level to facilitate the subsequent molding and combustion processes;

[0003] By using a drying device to dry the biomass pellet raw materials, it can ensure that the produced pellets have good quality and combustion characteristics, while reducing environmental impact and improving energy efficiency;

[0004] In the process of drying biomass pellet raw materials by existing drying equipment, if the biomass pellet raw materials are compressed together, the drying effect in the middle of the compression is poor, which will affect the drying effect of the entire biomass pellet raw materials. Therefore, in order to solve the above problem, a drying device and processing method for biomass pellet production are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a drying device and processing method for biomass pellet production, so as to solve the problem that when the existing drying equipment is drying the biomass pellet raw materials, if the biomass pellet raw materials are compressed together, the drying effect in the middle of the compression is poor, which in turn affects the drying effect of the entire biomass pellet raw materials.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A drying device and processing method for producing biomass particles, comprising a diffusion barrel, wherein a throwing mechanism is installed on all sides of the inner side of the diffusion barrel, a limiting mechanism is installed on one side of the diffusion barrel, an air duct is installed at the tail end of the diffusion barrel, an annular tube is installed at the bottom end of the air duct, the side of the annular tube is fixedly connected to a suction unit through a connecting pipe, an annular filter is installed inside the annular tube, a straight tube is installed at the bottom of the annular tube, a scraper is installed inside the annular filter, and the bottom of the straight tube is fixedly connected to a heating mechanism; the limiting mechanism comprises a fixed seat, and a fixed seat has an upper end. The inside of the side is rotatably connected to the first rotating shaft through a first clockwork spring, and the other end of the first rotating shaft is fixedly connected to the bent rod. The spreading mechanism includes a spreading plate, and the two ends of the inner side of the spreading plate are rotatably connected to the second rotating shaft through a second clockwork spring, and the other end of the second rotating shaft is fixedly connected to the fixed rod; the heating mechanism includes a heating box, a drying circular tube is fixedly connected to the inside of the heating box, a spiral feeding blade is installed inside the drying circular tube, one end of the spiral feeding blade is fixedly connected to the power shaft, and a feeding port is provided at the upper end of one side of the heating box and the drying circular tube.

[0008] As a further optimization content of the present invention, a driving mechanism is installed on one side of the diffusion barrel, and the driving mechanism includes a motor bracket, a first motor is fixedly connected in the middle of the motor bracket, a gear is fixedly connected to the top of the first motor main shaft, the upper end of the gear is meshed with a gear ring, and the gear ring is fixedly connected to the outside of one end of the diffusion barrel, and a protective shell fixedly connected to the motor bracket is installed on the outside of the gear ring and the gear.

[0009] As a further optimization of the present invention, the diffusion barrel is rotatably connected inside a positioning ring, two positioning rings are provided, and support legs are installed on both sides of the bottom end of the positioning ring, and the support legs are parallel to each other.

[0010] As a further optimization of the present invention, the bent end of the bent rod is arranged inside the diffusion barrel, the bottom end of the fixed seat is fixedly connected to the supporting leg, the fixed seat is L-shaped, four of the spreading mechanisms are provided, the spreading plate is L-shaped, and one end of the fixed rod is fixedly connected to the inner wall of the diffusion barrel.

[0011] As further optimized content of the present invention, the air duct includes a bent pipe, a positioning hole is opened at the upper end of the bent pipe, the contact end of the bent pipe and the diffusion barrel is trumpet-shaped, the bent pipe is L-shaped, the upper end of the bent pipe is fixedly connected to a third motor, the top end of the third motor main shaft is fixedly connected to a vertical shaft, the bottom end of the vertical shaft is fixedly connected to a scraper, and the vertical shaft is rotatably connected to the bent pipe through the positioning hole.

[0012] As a further optimization of the present invention, the connecting pipe is connected to the inside of the annular pipe, the bottom end of the straight pipe is connected to the bottom of the drying circular pipe through the feed port, and the drying circular pipe and the annular filter screen have the same axis.

[0013] As a further optimization of the present invention, one end of the heating box is fixedly connected to a second motor, the top end of the second motor main shaft is fixedly connected to the power shaft, the power shaft is rotatably connected to the heating box and the drying tube, and the ends of the drying tube and the heating box away from the power shaft are both open.

[0014] As a further optimization of the present invention, the scraper is Z-shaped, the two ends of the scraper are arc-shaped, the center point of the scraper and the center point of the annular filter are arranged on the same vertical line, and the height of the scraper is equal to the height of the annular filter.

[0015] As a further optimization of the present invention, the vertical cross-section of the annular tube is U-shaped on one side, and the annular tube is slidably connected to the upper and lower ends of the annular filter.

[0016] As further optimized content of the present invention, among them: S1: breaking up the biomass granulation raw materials: putting the biomass granulation raw materials into the diffusion barrel, the diffusion barrel is driven by the driving mechanism to rotate, and the diffusion barrel drives the internal throwing mechanism to rotate during the rotation. During the rotation, the throwing mechanism brings a part of the biomass granulation raw materials that fall on the bottom of the diffusion barrel to the upper end and contacts the curved rod. When the throwing mechanism contacts the curved rod, the throwing plate rotates under the resistance of the curved rod. When the throwing plate breaks through the resistance of the curved rod driven by the diffusion barrel, the throwing plate will quickly throw the carried materials, and at the same time, the inertia generated by the rotation of the diffusion barrel is used to make the biomass granulation raw materials in the diffusion barrel in a floating state, and the heavier biomass granulation raw materials will fall to the bottom of the diffusion barrel and collide with the bottom of the diffusion barrel to make it loose;

[0017] S2: Wind selection of bulk materials: The biomass granulation raw materials in a scattered state will enter the annular filter from the inside of the air duct under the action of the suction unit and adhere to the inner wall of the annular filter. During this process, the third motor continuously drives the vertical shaft and the scraper to rotate, and the scraper will scrape off the biomass granulation raw materials attached to the inner wall of the annular filter and enter the heating mechanism through the straight pipe;

[0018] S3: Bulk material transmission and drying: When the biomass pelletizing raw materials enter the heating mechanism, they pass through the heating box and the drying round tube through the spiral feeding blades and are discharged. When the biomass pelletizing raw materials pass through the heating box and the drying round tube, they are in a loose state, which improves the drying effect and further improves the effect of the subsequent pelletizing.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, by providing a diffusion barrel, a limiting mechanism and a throwing mechanism, the biomass pelletizing raw material can be made into a fluffy state before drying the biomass pelletizing raw material, thereby avoiding the problem that the biomass pelletizing raw material is compressed together and cannot be dried inside. At the same time, during the initial feeding process, the biomass pelletizing raw material is fed by air selection, which can remove larger particles and impurities of the biomass pelletizing raw material, further improving the production quality of the biomass pellets in the later stage;

[0021] 2. In the present invention, the air separation function (through the air duct and the suction unit) and the drying function (through the heating mechanism) in the device are combined, which can not only effectively remove light impurities in the raw materials, but also preliminarily dry the raw materials during the air separation process. This integrated design reduces the need for additional equipment, saves space, and improves production efficiency;

[0022] 3. In the present invention, the movement of the spiral feeding blades inside the heating box and the drying round tube ensures the stable transportation and uniform drying of the biomass pelletizing raw materials. This continuous drying process helps to obtain dry raw materials with consistent quality, providing a reliable raw material guarantee for the final pelletizing. In addition, the design of the drying round tube allows the material to remain in a loose state during the heating process, further improving the drying effect and the quality of the subsequent pelletizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the driving mechanism of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the limiting mechanism of the present invention;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle;

[0027] Figure 5 For the present invention Figure 3 Schematic diagram of the structure at B in the middle;

[0028] Figure 6 It is a schematic diagram of the heating mechanism structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the scraper structure of the present invention.

[0030] In the figure: 1. diffusion barrel;

[0031] 2. driving mechanism; 21. motor bracket; 22. first motor; 23. gear; 24. gear ring;

[0032] 3. Support legs; 4. Positioning ring;

[0033] 5. Limiting mechanism; 51. Fixed seat; 52. Bending rod; 53. First spring; 54. First rotating shaft;

[0034] 6. Sprinkling mechanism; 61. Sprinkling plate; 62. Fixed rod; 63. Second rotating shaft; 64. Second spring;

[0035] 7. Air duct; 71. Elbow; 72. Positioning hole;

[0036] 8. Suction unit;

[0037] 9. Heating mechanism; 91. Heating box; 92. Drying round tube; 93. Spiral feeding blade; 94. Power shaft; 95. Feeding port;

[0038] 10. Connecting pipe; 11. Second motor; 12. Third motor; 13. Annular filter; 14. Straight pipe; 15. Vertical axis; 16. Scraper; 17. Annular pipe. DETAILED DESCRIPTION

[0039] See also Figure 1-7 , the present invention provides a technical solution:

[0040] A drying device and processing method for biomass pellet production, comprising a diffusion barrel 1, a spreading mechanism 6 is installed on all sides of the inner side of the diffusion barrel 1, a limiting mechanism 5 is installed on one side of the diffusion barrel 1, an air duct 7 is installed at the tail end of the diffusion barrel 1, an annular tube 17 is installed at the bottom of the air duct 7, the side of the annular tube 17 is fixedly connected to the suction unit 8 through a connecting pipe 10, an annular filter screen 13 is installed inside the annular tube 17, a straight tube 14 is installed at the bottom of the annular tube 17, a scraper 16 is installed inside the annular filter screen 13, and the bottom of the straight tube 14 is fixedly connected to the heating mechanism 9; the limiting mechanism 5 includes a fixing seat 51, and the fixing seat 51 has a fixed seat 52 on one side of the upper end thereof. The first clockwork spring 53 is rotatably connected to the first rotating shaft 54, and the other end of the first rotating shaft 54 ​​is fixedly connected to the bent rod 52. The spreading mechanism 6 includes a spreading plate 61, and both ends of the inner side of the spreading plate 61 are rotatably connected to the second rotating shaft 63 through the second clockwork spring 64, and the other end of the second rotating shaft 63 is fixedly connected to the fixed rod 62; the heating mechanism 9 includes a heating box 91, and a drying circular tube 92 is fixedly connected to the inside of the heating box 91, and a spiral feeding blade 93 is installed inside the drying circular tube 92, and one end of the spiral feeding blade 93 is fixedly connected to the power shaft 94, and a feed port 95 is provided at the upper end of one side of the heating box 91 and the drying circular tube 92.

[0041] As a technical solution for further implementation of this scheme, a driving mechanism 2 is installed on one side of the diffusion barrel 1, and the driving mechanism 2 includes a motor bracket 21, a first motor 22 is fixedly connected in the middle of the motor bracket 21, a gear 23 is fixedly connected to the top of the main shaft of the first motor 22, the upper end of the gear 23 is meshed with a gear ring 24, the gear ring 24 is fixedly connected to the outside of one end of the diffusion barrel 1, and a protective shell fixedly connected to the motor bracket 21 is installed on the outside of the gear ring 24 and the gear 23, which can provide sufficient and stable power for the rotation of the diffusion barrel 1;

[0042] As a technical solution for further implementation of this solution, the diffusion barrel 1 is rotatably connected inside the positioning ring 4, and the positioning ring 4 is provided with two. Support legs 3 are installed on both sides of the bottom of the positioning ring 4. The support legs 3 are parallel to each other, which can stably support the diffusion barrel 1 and ensure the stability of the diffusion barrel 1 during rotation;

[0043] As a technical solution for further implementation of this solution, the bent end of the bent rod 52 is arranged inside the diffusion barrel 1, the bottom end of the fixed seat 51 is fixedly connected to the support leg 3, the fixed seat 51 is L-shaped, and the throwing mechanism 6 is provided with four, and the throwing plate 61 is L-shaped, and one end of the fixed rod 62 is fixedly connected to the inner wall of the diffusion barrel 1, and the fixed seat 51 can be limited by the support leg 3, and the biomass granulation raw materials can be scattered by the set throwing mechanism 6;

[0044] As a technical solution for further implementation of this solution, the air duct 7 includes a curved pipe 71, a positioning hole 72 is opened at the upper end of the curved pipe 71, the contact end of the curved pipe 71 and the diffusion barrel 1 is in a trumpet shape, the curved pipe 71 is L-shaped, the upper end of the curved pipe 71 is fixedly connected to the third motor 12, the top end of the main shaft of the third motor 12 is fixedly connected to the vertical shaft 15, the bottom end of the vertical shaft 15 is fixedly connected to the scraper 16, the vertical shaft 15 and the curved pipe 71 are rotatably connected through the positioning hole 72, and the biomass granulation raw materials in the scattered state can be air-selected;

[0045] As a technical solution for further implementation of this solution, the connecting pipe 10 is connected to the inside of the annular pipe 17, the bottom end of the straight pipe 14 is connected to the bottom of the drying circular pipe 92 through the feed port 95, the drying circular pipe 92 and the annular filter 13 have the same axis, one end of the heating box 91 is fixedly connected to the second motor 11, the top of the main shaft of the second motor 11 is fixedly connected to the power shaft 94, the power shaft 94 is rotatably connected to the heating box 91 and the drying circular pipe 92, and the drying circular pipe 92 and the heating box 91 are both open at one end away from the power shaft 94. Through the above arrangement, the material can be stably dried and the material can be stably discharged after drying.

[0046] As a technical solution for further implementation of this solution, the scraper 16 is Z-shaped, the two ends of the scraper 16 are arc-shaped, the center point of the scraper 16 and the center point of the annular filter 13 are arranged on the same vertical line, and the height of the scraper 16 is equal to the height of the annular filter 13, and the material attached to the inner surface of the annular filter 13 can be scraped off by the scraper 16;

[0047] As a further technical solution for implementing this solution, the vertical cross-section of the annular tube 17 is U-shaped on one side, and the annular tube 17 is slidably connected to the upper and lower ends of the annular filter screen 13, so that the annular filter screen 13 can be replaced separately later;

[0048] S1: Breaking up the biomass granulation raw materials: putting the biomass granulation raw materials into the diffusion barrel 1, and the diffusion barrel 1 rotates under the drive of the driving mechanism 2. During the rotation of the diffusion barrel 1, the internal throwing mechanism 6 is driven to rotate. During the rotation of the throwing mechanism 6, a part of the biomass granulation raw materials dropped on the bottom of the diffusion barrel 1 is brought to the upper end and contacted with the curved rod 52. When the throwing mechanism 6 contacts the curved rod 52, the throwing plate 61 rotates under the resistance of the curved rod 52. When the throwing plate 61 breaks through the resistance of the curved rod 52 under the drive of the diffusion barrel 1, the throwing plate 61 will quickly throw the carried materials, and at the same time, the inertia generated by the rotation of the diffusion barrel 1 is used to make the biomass granulation raw materials in the diffusion barrel 1 in a floating state, and the heavier biomass granulation raw materials will fall to the bottom of the diffusion barrel 1 and collide with the bottom of the diffusion barrel 1 to make it loose;

[0049] S2: air selection of bulk materials: the biomass granulation raw materials in the floating state will enter the annular filter screen 13 from the inside of the air duct 7 under the action of the suction unit 8, and adhere to the inner wall of the annular filter screen 13. During this process, the third motor 12 continuously drives the vertical shaft 15 and the scraper 16 to rotate, and the scraper 16 will scrape off the biomass granulation raw materials attached to the inner wall of the annular filter screen 13, and enter the heating mechanism 9 through the straight pipe 14;

[0050] S3: Bulk material conveying and drying: When the biomass granulation raw materials enter the heating mechanism 9, they pass through the heating box 91 and the drying tube 92 through the spiral feeding blades 93 and are discharged. When the biomass granulation raw materials pass through the heating box 91 and the drying tube 92, they are in a loose state, which improves the drying effect and further improves the effect of the subsequent granulation.

[0051] Through the synergistic effect of the diffusion barrel 1 and the throwing mechanism 6, the biomass pellet raw materials are effectively broken up and dispersed inside the drying device, increasing the contact area between the raw materials and the hot air, thereby improving the drying efficiency and uniformity. This breaking mechanism also helps to improve the flow characteristics of the raw materials, creating good conditions for the subsequent molding process;

[0052] This drying device and processing method for biomass pellet production achieves effective breaking up, air separation and drying of raw materials through innovative structural design, improves production efficiency and product quality, and provides an efficient and environmentally friendly solution for the production of biomass energy.

[0053] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the methods and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A drying device for producing biomass pellets, comprising a diffusion barrel (1), characterized in that: The diffusion barrel (1) is provided with a spreading mechanism (6) on all sides of the inner side, a limiting mechanism (5) is provided on one side of the diffusion barrel (1), an air duct (7) is provided at the rear end of the diffusion barrel (1), an annular tube (17) is provided at the bottom end of the air duct (7), the side of the annular tube (17) is fixedly connected to the suction unit (8) via a connecting tube (10), an annular filter (13) is provided inside the annular tube (17), a straight tube (14) is provided at the bottom of the annular tube (17), a scraper (16) is provided inside the annular filter (13), and the bottom of the straight tube (14) is fixedly connected to the heating mechanism (9); The limiting mechanism (5) comprises a fixing seat (51), one side of the upper end of the fixing seat (51) is rotatably connected to a first rotating shaft (54) via a first spring spring (53), the other end of the first rotating shaft (54) is fixedly connected to the bent rod (52), and the throwing mechanism (6) comprises a throwing plate (61), both ends of the inner side of the throwing plate (61) are rotatably connected to a second rotating shaft (63) via a second spring spring (64), and the other end of the second rotating shaft (63) is fixedly connected to the fixing rod (62); The heating mechanism (9) comprises a heating box (91), a drying round tube (92) being fixedly connected to the interior of the heating box (91), a spiral feeding blade (93) being installed inside the drying round tube (92), one end of the spiral feeding blade (93) being fixedly connected to a power shaft (94), and a feed port (95) being provided at the upper end of one side of the heating box (91) and the drying round tube (92).

2. A drying device for producing biomass particles according to claim 1, characterized in that: A driving mechanism (2) is installed on one side of the diffusion barrel (1), and the driving mechanism (2) includes a motor bracket (21), a first motor (22) is fixedly connected in the middle of the motor bracket (21), a gear (23) is fixedly connected to the top end of the main shaft of the first motor (22), the upper end of the gear (23) is meshed with a gear ring (24), and the gear ring (24) is fixedly connected to the outside of one end of the diffusion barrel (1), and a protective shell fixedly connected to the motor bracket (21) is installed on the outside of the gear ring (24) and the gear (23).

3. A drying device for producing biomass particles according to claim 1, characterized in that: The diffusion barrel (1) is rotatably connected inside a positioning ring (4), and the positioning ring (4) is provided with two. Support legs (3) are installed on both sides of the bottom end of the positioning ring (4), and the support legs (3) are parallel to each other.

4. A drying device for producing biomass particles according to claim 1, characterized in that: The bent end of the bent rod (52) is arranged inside the diffusion barrel (1), the bottom end of the fixed seat (51) is fixedly connected to the support leg (3), the fixed seat (51) is L-shaped, four of the spreading mechanisms (6) are provided, the spreading plate (61) is L-shaped, and one end of the fixed rod (62) is fixedly connected to the inner wall of the diffusion barrel (1).

5. A drying device for producing biomass particles according to claim 1, characterized in that: The air duct (7) comprises a curved pipe (71), a positioning hole (72) is formed at the upper end of the curved pipe (71), the contact end of the curved pipe (71) with the diffusion barrel (1) is in a bell-mouth shape, the curved pipe (71) is L-shaped, the upper end of the curved pipe (71) is fixedly connected to a third motor (12), the top end of the main shaft of the third motor (12) is fixedly connected to a vertical shaft (15), the bottom end of the vertical shaft (15) is fixedly connected to a scraper (16), and the vertical shaft (15) is rotatably connected to the curved pipe (71) via the positioning hole (72).

6. A drying device for producing biomass particles according to claim 1, characterized in that: The connecting pipe (10) is connected to the inside of the annular pipe (17), the bottom end of the straight pipe (14) is connected to the bottom of the drying circular pipe (92) through the feed port (95), and the drying circular pipe (92) and the annular filter screen (13) are coaxial.

7. A drying device for producing biomass particles according to claim 1, characterized in that: A second motor (11) is fixedly connected to one end of the heating box (91); the top end of the main shaft of the second motor (11) is fixedly connected to a power shaft (94); the power shaft (94) is rotatably connected to the heating box (91) and the drying round tube (92); and the ends of the drying round tube (92) and the heating box (91) away from the power shaft (94) are both open.

8. A drying device for producing biomass particles according to claim 1, characterized in that: The scraper (16) is Z-shaped, and both ends of the scraper (16) are arc-shaped. The center point of the scraper (16) and the center point of the annular filter (13) are arranged on the same vertical line, and the height of the scraper (16) is equal to the height of the annular filter (13).

9. A drying device for producing biomass particles according to claim 1, characterized in that: The annular tube (17) has a U-shaped vertical cross-section on one side, and the annular tube (17) is slidably connected to the annular filter screen (13) at both the upper and lower ends.

10. The method for processing a drying device for producing biomass particles according to claim 1, characterized in that: S1: Breaking up the biomass pelletized raw materials: the biomass pelletized raw materials are put into the diffusion barrel (1), and the diffusion barrel (1) is driven by the driving mechanism (2) to rotate. During the rotation of the diffusion barrel (1), the internal throwing mechanism (6) is driven to rotate. During the rotation of the spreading mechanism (6), a part of the biomass pelletized raw materials that have fallen on the bottom of the diffusion barrel (1) is brought to the upper end and contacted with the curved rod (52). When the throwing mechanism (6) contacts the curved rod (52), the throwing plate (61) rotates under the resistance of the curved rod (52). When the throwing plate (61) breaks through the resistance of the curved rod (52) driven by the diffusion barrel (1), the throwing plate (61) will quickly throw the carried materials. At the same time, the inertia generated by the rotation of the diffusion barrel (1) is used to make the biomass pelletized raw materials float in the diffusion barrel (1). The heavier biomass pelletized raw materials will fall to the bottom of the diffusion barrel (1) and collide with the bottom of the diffusion barrel (1) to make them loose. S2: air selection of bulk materials: the biomass granulation raw materials in a floating state enter the annular filter (13) from the inside of the air duct (7) under the action of the suction unit (8), and adhere to the inner wall of the annular filter (13). During this process, the third motor (12) continuously drives the vertical shaft (15) and the scraper (16) to rotate, and the scraper (16) scrapes off the biomass granulation raw materials adhering to the inner wall of the annular filter (13), and enters the inside of the heating mechanism (9) through the straight pipe (14); S3: Bulk material conveying and drying: When the biomass pelletizing raw material enters the interior of the heating mechanism (9), it passes through the interior of the heating box (91) and the drying circular tube (92) through the spiral feeding blades (93) and is discharged. When the biomass pelletizing raw material passes through the interior of the heating box (91) and the drying circular tube (92), the biomass pelletizing raw material is in a loose state, which improves the drying effect and further improves the effect of subsequent pelletizing.

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