A drying device for biomass pellet production
By using a closed-loop thermal circulation system and a rotating tumbling design, the problems of heat energy waste and low drying efficiency in biomass pellet drying devices are solved, achieving stability and cleanliness in heat energy recovery and the drying process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUANGSHAN LIANXING BIOMASS ENERGY CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-06-23
AI Technical Summary
Existing biomass pellet drying equipment directly discharges hot and humid air after drying, resulting in wasted heat energy and insufficient drying efficiency and stability.
A closed-loop thermal circulation system is adopted, which uses heat exchange and preheating components to recover heat from the humid air. The rotation of the drying drum is driven by a geared motor and the spiral conveyor plate design ensures that the particles are turned over evenly and move in an orderly manner. Combined with the wind shield, the leakage of hot and humid air is reduced.
It achieves the recycling of thermal energy, improves drying efficiency and stability, prevents particle accumulation and coking, and ensures the practicality of the equipment and environmental cleanliness.
Smart Images
Figure CN224398189U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of biomass pellet processing technology, and more specifically to a drying device for biomass pellet production. Background Technology
[0002] Biomass pellets are an environmentally friendly pellet fuel made from biomass raw materials. Their production process requires strict pretreatment and forming techniques. During storage, biomass pellets absorb moisture from the environment, affecting their later use. Therefore, after long-term storage, the biomass fuel needs to be dried and processed.
[0003] A search revealed an existing patent (publication number: CN221005765U) that discloses a drying device for biomass pellet production. In its operation, the biomass pellets rotate within a rotating drum, while hot air is emitted from the upper ventilation and heating components to dry the continuously rotating biomass pellets, increasing the drying effect. During rotation, decomposed and broken biomass pellets are sieved, allowing completely decomposed pellets to fall onto the base for easy recycling. However, the inventors discovered the following problem with the existing technology during the development of this invention: After heating and drying the biomass pellets, the aforementioned drying device directly discharges the hot, humid air into the external environment. Since the discharged air contains a large amount of heat, direct discharge results in a waste of thermal energy.
[0004] In view of this, the present invention proposes a drying device for biomass pellet production. Utility Model Content
[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drying device for biomass pellet production to solve the problems existing in the background art.
[0006] This utility model provides the following technical solution: a drying device for biomass pellet production, including a casing, a drying cylinder rotatably connected to the inner wall of the casing, ventilation holes opened on the surface of the drying cylinder, a ventilation cavity reserved between the casing and the drying cylinder, and a drive assembly provided between the casing and the drying cylinder, a feed inlet and a discharge outlet reserved at the left and right ends of the drying cylinder respectively, an air inlet pipe and an air outlet pipe respectively embedded on the back of the casing corresponding to the feed inlet and the discharge outlet, a blower fan and an electric heating grid respectively fixedly installed on the inner wall of the air inlet pipe, the air outlet end of the blower fan facing the inside of the casing, an exhaust fan fixedly installed on the inner wall of the exhaust fan facing the inside of the casing, and heat exchange and preheating components provided on the inner walls of the air inlet pipe and the air outlet pipe;
[0007] The heat exchange preheating assembly includes a first heat exchange coil disposed on the inner wall of the air inlet pipe and a second heat exchange coil disposed on the inner wall of the air outlet pipe. A liquid storage tank is fixedly installed on the back of the casing. The liquid storage tank contains heat transfer oil. A circulation pump is fixedly installed on the lower side wall of the liquid storage tank. The inlet end of the circulation pump is connected to the inner cavity of the liquid storage tank. The outlet end of the circulation pump is connected to the inlet end of the first heat exchange coil. The outlet end of the first heat exchange coil is connected to the inlet end of the second heat exchange coil. The outlet end of the second heat exchange coil is connected to the inner cavity of the liquid storage tank.
[0008] Furthermore, the drive assembly includes a geared motor fixedly mounted on the upper left of the chassis, a gear fixedly mounted on the output shaft surface of the geared motor, and a gear ring fixedly mounted on the surface of the drying cylinder, with the gear and gear ring meshing with each other.
[0009] As a further description of the above technical solution: the gear is driven to rotate by the gear motor, and the meshing effect of the gear and the gear ring drives the drying drum to rotate inside the machine box, thereby realizing the uniform tumbling of biomass pellets inside the drying drum and further improving the drying efficiency.
[0010] Furthermore, a feed hopper is fixedly installed on the left end of the chassis, and the discharge end of the feed hopper extends into the feed inlet of the drying cylinder.
[0011] As a further description of the above technical solution: by setting up a feed hopper, it is convenient to feed biomass pellets.
[0012] Furthermore, a spiral conveyor plate is fixedly installed on the inner wall of the drying cylinder.
[0013] As a further description of the above technical solution: by setting up a spiral conveyor plate, the biomass pellets can move forward in an orderly manner inside the drying cylinder, avoiding the problems of pellet accumulation and blockage, ensuring the continuity and stability of drying, and effectively preventing overheating or coking of the pellets during the drying process.
[0014] Furthermore, a slag storage chamber is provided on the inner wall of the casing below the drying cylinder, and a slag discharge slide is provided at the bottom end of the slag storage chamber. The lower end of the slag discharge slide extends to the lower front of the casing, and a slag collection plate is fixedly installed on the front of the casing corresponding to the slag outlet of the slag discharge slide. A gate is inserted on the front of the casing corresponding to the slag outlet of the slag discharge slide.
[0015] As a further description of the above technical solution: the slag storage chamber and slag discharge slide below the drying cylinder facilitate the collection of dried particles and the cleaning of residues, greatly improving the practicality and ease of maintenance of the device.
[0016] Furthermore, both the first heat exchange coil and the second heat exchange coil are embedded with thermally conductive copper wires.
[0017] As a further description of the above technical solution: by setting thermally conductive copper wires, the heat exchange area of the heat exchange coil can be increased, the heat exchange effect of the air can be improved, and the efficiency of heat recovery and preheating can be enhanced.
[0018] Furthermore, the outer wall of the machine casing is equipped with wind shields corresponding to the inlet and outlet of the drying cylinder, and the bottom end of the wind shields is reserved with an outlet gap for the biomass pellets to be discharged.
[0019] As a further description of the above technical solution: by setting up a windproof plate, the leakage of hot and humid air during the drying process is effectively reduced, while ensuring the cleanliness of the environment during the drying process.
[0020] Furthermore, a control panel is fixedly installed on the front of the chassis, and the control panel is electrically connected to an external power supply via wires.
[0021] As a further description of the above technical solution: by setting up a control panel, the operator can flexibly adjust the drying temperature and time according to production needs, ensuring the controllability and stability of the drying process.
[0022] The technical effects and advantages of this utility model are as follows:
[0023] 1. Compared with existing technologies, this drying device for biomass pellet production adds biomass pellets into the drying drum. During the rotation of the drying drum, a blower fan drives air into the ventilation chamber. The airflow is heated by an electric heating grid and then enters the drying drum through the ventilation holes, achieving the effect of drying the biomass pellets. Subsequently, the hot and humid air is discharged through the exhaust pipe by the exhaust fan. Through the heat exchange preheating components, the liquid storage tank, the circulating pump, the first heat exchange coil, and the second heat exchange coil, a closed heat circulation system is formed, which can recover part of the heat in the discharged hot and humid air and then preheat the air entering through the inlet pipe, realizing the recycling of heat energy, improving the utilization rate of heat energy, and reducing energy waste.
[0024] 2. Compared with existing technologies, this drying device for biomass pellet production uses a geared motor to drive the gears to rotate. The meshing effect of the gears and the gear ring drives the drying drum to rotate inside the machine, thereby achieving uniform tumbling of the biomass pellets inside the drying drum and further improving drying efficiency. At the same time, the design of the spiral conveyor plate allows the biomass pellets to move forward in an orderly manner inside the drying drum, avoiding the problems of pellet accumulation and blockage, ensuring the continuity and stability of drying, and effectively preventing overheating or charring of the pellets during the drying process.
[0025] 3. Compared with existing technologies, the drying device for biomass pellet production features a slag storage chamber and slag discharge chute below the drying drum, which facilitates the collection of dried pellets and the cleaning of residue, greatly improving the practicality and ease of maintenance of the device. The addition of heat-conducting copper wires increases the heat exchange area of the heat exchange coils, enhancing the heat exchange effect of the air and improving the efficiency of heat recovery and preheating. The control panel allows operators to flexibly adjust the drying temperature and time according to production needs, ensuring the controllability and stability of the drying process. The wind shield effectively reduces the leakage of hot and humid air during the drying process, while ensuring a clean environment. Attached Figure Description
[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention from one perspective;
[0027] Figure 2 This is a two-dimensional structural schematic diagram of the present invention.
[0028] Figure 3 This is a schematic diagram of the orthographic section of the present invention;
[0029] Figure 4 This is a schematic diagram of the left cross-section of the air inlet pipe of this utility model.
[0030] The attached diagram is labeled as follows: 1. Chassis; 2. Drying drum; 3. Ventilation hole; 4. Air inlet pipe; 5. Air outlet pipe; 6. Blower fan; 7. Electric heating grid; 8. Exhaust fan; 9. First heat exchange coil; 10. Second heat exchange coil; 11. Liquid storage tank; 12. Circulation pump; 13. Gear motor; 14. Gear; 15. Gear ring; 16. Feed hopper; 17. Spiral conveyor plate; 18. Slag discharge chute; 19. Slag collection tray; 20. Gate; 21. Heat-conducting copper wire; 22. Control panel; 23. Wind shield. Detailed Implementation
[0031] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The drying device for biomass pellet production involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] Reference Figures 1 to 4 This utility model provides a drying device for biomass pellet production, including a casing 1, a control panel 22 fixedly installed on the front of the casing 1, and the control panel 22 being electrically connected to an external power source through wires.
[0033] By setting up the control panel 22, the entire device can be powered and controlled, allowing the operator to flexibly adjust the drying temperature and time according to production needs, thus ensuring the controllability and stability of the drying process.
[0034] The inner wall of the casing 1 is rotatably connected to the drying cylinder 2. The surface of the drying cylinder 2 is provided with ventilation holes 3. A ventilation cavity is reserved between the casing 1 and the drying cylinder 2, and a drive assembly is provided between the casing 1 and the drying cylinder 2.
[0035] The drive assembly includes a geared motor 13 fixedly mounted on the upper left of the housing 1. A gear 14 is fixedly mounted on the output shaft surface of the geared motor 13, and a gear ring 15 is fixedly mounted on the surface of the drying cylinder 2. The gear 14 and the gear ring 15 mesh with each other.
[0036] The left and right ends of the drying cylinder 2 are respectively reserved with a feed inlet and a discharge outlet. The left end of the casing 1 is fixedly installed with a feed hopper 16, and the discharge end of the feed hopper 16 extends into the feed inlet of the drying cylinder 2.
[0037] On the back of the casing 1, an air inlet pipe 4 and an air outlet pipe 5 are respectively installed corresponding to the inlet and outlet. A blower fan 6 and an electric heating grid 7 are fixedly installed on the inner wall of the air inlet pipe 4. The air outlet of the blower fan 6 faces the inside of the casing 1. An exhaust fan 8 is fixedly installed on the inner wall of the air outlet pipe 5. The air inlet of the exhaust fan 8 faces the inside of the casing 1.
[0038] It is worth noting that, when using this drying device for biomass pellet production, the biomass pellets are fed into the drying cylinder 2 through the feed hopper 16. The gear 14 is driven to rotate by the reduction motor 13. Under the meshing effect of the gear 14 and the gear ring 15, the drying cylinder 2 is driven to rotate inside the machine box 1, thereby achieving uniform tumbling of the biomass pellets inside the drying cylinder 2. During the rotation of the drying cylinder 2, the blower fan 6 drives air into the ventilation chamber. After the airflow is heated by the electric heating grid 7, it enters the drying cylinder 2 through the ventilation hole 3. Subsequently, the hot and humid air is discharged from the air outlet pipe 5 under the action of the exhaust fan 8, thus achieving the effect of drying the biomass pellets.
[0039] A spiral conveyor plate 17 is fixedly installed on the inner wall of the drying cylinder 2.
[0040] The design of the spiral conveyor plate 17 enables the biomass pellets to move forward in an orderly manner while tumbling inside the drying cylinder 2, avoiding the problems of pellet accumulation and blockage, ensuring the continuity and stability of drying, and effectively preventing overheating or charring of the pellets during the drying process.
[0041] A slag storage chamber is provided on the inner wall of the casing 1 below the drying cylinder 2. A slag discharge slide 18 is provided at the bottom of the slag storage chamber. The lower end of the slag discharge slide 18 extends to the lower front of the casing 1. A slag collection plate 19 is fixedly installed on the front of the casing 1 corresponding to the slag outlet of the slag discharge slide 18. A gate 20 is inserted on the front of the casing 1 corresponding to the slag outlet of the slag discharge slide 18.
[0042] Furthermore, the slag storage chamber and slag discharge slide 18 below the drying cylinder 2 in this drying device for biomass pellet production facilitate the collection of dried pellets and the cleaning of residues, greatly improving the practicality and ease of maintenance of the device.
[0043] The outer wall of the casing 1 is equipped with wind shields 23 corresponding to the inlet and outlet of the drying cylinder 2. The bottom end of the wind shields 23 is reserved with an outlet gap for the biomass pellets to be discharged.
[0044] By setting up the wind shield 23, the leakage of hot and humid air during the drying process is effectively reduced, while ensuring a clean environment during the drying process.
[0045] The inner walls of the air inlet pipe 4 and the air outlet pipe 5 are equipped with heat exchange and preheating components;
[0046] The heat exchange preheating assembly includes a first heat exchange coil 9 disposed on the inner wall of the air inlet pipe 4 and a second heat exchange coil 10 disposed on the inner wall of the air outlet pipe 5. A liquid storage tank 11 is fixedly installed on the back of the casing 1. The liquid storage tank 11 contains heat transfer oil. A circulation pump 12 is fixedly installed on the lower side wall of the liquid storage tank 11. The liquid inlet of the circulation pump 12 is connected to the inner cavity of the liquid storage tank 11. The liquid outlet of the circulation pump 12 is connected to the liquid inlet of the first heat exchange coil 9. The liquid outlet of the first heat exchange coil 9 is connected to the liquid inlet of the second heat exchange coil 10. The liquid outlet of the second heat exchange coil 10 is connected to the inner cavity of the liquid storage tank 11.
[0047] It is worth noting that by setting up heat exchange preheating components, the liquid storage tank 11, the circulating pump 12, the first heat exchange coil 9 and the second heat exchange coil 10 form a closed heat circulation system, which can recover part of the heat in the discharged hot and humid air and then preheat the air entering through the air inlet duct 4, realizing the recycling of heat energy, improving the utilization rate of heat energy and reducing energy waste.
[0048] The surfaces of the first heat exchange coil 9 and the second heat exchange coil 10 are both embedded with thermally conductive copper wires 21.
[0049] Furthermore, by setting the heat-conducting copper wire 21, the heat exchange effect of the air can be improved, and the efficiency of heat recovery and preheating can be enhanced.
[0050] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
Claims
1. A drying apparatus for biomass pellet production, comprising a casing (1), characterized in that: The inner wall of the casing (1) is rotatably connected to the drying cylinder (2). The surface of the drying cylinder (2) is provided with ventilation holes (3). A ventilation cavity is reserved between the casing (1) and the drying cylinder (2). A drive assembly is provided between the casing (1) and the drying cylinder (2). The left and right ends of the drying cylinder (2) are reserved with a feed inlet and a discharge outlet, respectively. The back of the casing (1) is fitted with an air inlet pipe (4) and an air outlet pipe (5) corresponding to the feed inlet and the discharge outlet, respectively. A blower fan (6) and an electric heating grid (7) are fixedly installed on the inner wall of the air inlet pipe (4). The air outlet of the blower fan (6) faces the inside of the casing (1). An exhaust fan (8) is fixedly installed on the inner wall of the exhaust fan (8). The air inlet of the exhaust fan (8) faces the inside of the casing (1). A heat exchange preheating assembly is provided on the inner walls of the air inlet pipe (4) and the air outlet pipe (5). The heat exchange preheating assembly includes a first heat exchange coil (9) disposed on the inner wall of the air inlet pipe (4) and a second heat exchange coil (10) disposed on the inner wall of the air outlet pipe (5). A liquid storage tank (11) is fixedly installed on the back of the casing (1). The liquid storage tank (11) contains heat transfer oil. A circulation pump (12) is fixedly installed below the side wall of the liquid storage tank (11). The inlet end of the circulation pump (12) is connected to the inner cavity of the liquid storage tank (11). The outlet end of the circulation pump (12) is connected to the inlet end of the first heat exchange coil (9). The outlet end of the first heat exchange coil (9) is connected to the inlet end of the second heat exchange coil (10). The outlet end of the second heat exchange coil (10) is connected to the inner cavity of the liquid storage tank (11).
2. The drying apparatus for biomass pellet production according to claim 1, characterized in that: The drive assembly includes a geared motor (13) fixedly installed on the upper left of the chassis (1). A gear (14) is fixedly installed on the output shaft surface of the geared motor (13), and a gear ring (15) is fixedly installed on the surface of the drying cylinder (2). The gear (14) and the gear ring (15) mesh with each other.
3. A drying apparatus for biomass pellet production according to claim 1, characterized in that: A feed hopper (16) is fixedly installed on the left end of the machine casing (1), and the discharge end of the feed hopper (16) extends into the feed inlet of the drying cylinder (2).
4. A drying apparatus for biomass pellet production according to claim 1, characterized in that: A spiral conveyor plate (17) is fixedly installed on the inner wall of the drying cylinder (2).
5. A drying apparatus for biomass pellet production according to claim 1, characterized in that: The inner wall of the casing (1) is provided with a slag storage chamber below the drying cylinder (2). A slag discharge slide (18) is provided at the bottom of the slag storage chamber. The lower end of the slag discharge slide (18) extends to the lower front of the casing (1). A slag collection plate (19) is fixedly installed on the front of the casing (1) corresponding to the slag outlet of the slag discharge slide (18). A gate plate (20) is inserted on the front of the casing (1) corresponding to the slag outlet of the slag discharge slide (18).
6. A drying apparatus for biomass pellet production according to claim 1, characterized in that: The surfaces of the first heat exchange coil (9) and the second heat exchange coil (10) are both embedded with thermally conductive copper wires (21).
7. A drying apparatus for biomass pellet production according to claim 1, characterized in that: The control panel (22) is fixedly installed on the front of the chassis (1), and the control panel (22) is electrically connected to an external power supply through wires.
8. A drying apparatus for biomass pellet production according to claim 1, characterized in that: The outer wall of the casing (1) is equipped with a wind shield (23) corresponding to the inlet and outlet of the drying cylinder (2). The bottom end of the wind shield (23) is reserved with a gap for the discharge of biomass particles.