A biomass particle cooling device

Abstract

The utility model discloses a kind of cooling device of biomass granule, including cylindrical tower body, and the tower seat for supporting tower body;The top of the tower body is provided with feed inlet and exhaust port, the bottom of the tower body is provided with discharge port, the lower part of the tower body is provided with air inlet;Spiral flow guide plate is provided in the tower body, the middle part of the tower body is equipped with stand column;The outer aid of the flow guide plate is fixedly connected with the inner wall of tower body, inner edge is fixedly connected with stand column, forms spiral passage.The utility model has the advantages that effectively overcome the problem that particle falling speed is too fast in traditional free-fall cooling tower, gas-solid contact time is short, cooling efficiency is low, avoid the space and cost burden brought by blindly increasing tower body height for improving cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of biomass processing technology, and in particular to a cooling device for biomass pellets. Background Technology

[0002] Biomass pellet cooling systems are primarily used to rapidly cool freshly pressed, high-temperature biomass pellets to a temperature suitable for safe storage and transportation. These systems typically employ counter-current or co-current cooling structures, introducing ambient-temperature air to exchange heat with the hot pellets, removing heat from the pellet surface and interior. During the cooling process, cool air flows upwards (or in the designed direction) through the pellet layer, effectively reducing the pellet temperature while preventing deformation, pulverization, or spontaneous combustion risks caused by high temperatures. Common cooling equipment includes cooling towers, vibrating coolers, or fluidized bed coolers. These devices are characterized by their compact structure, high cooling efficiency, and low energy consumption, making them an indispensable key component of biomass pellet production lines.

[0003] Existing biomass pellet cooling devices mostly employ cooling tower structures. Their working principle typically involves allowing hot pellets to fall freely from top to bottom while simultaneously introducing ambient air (usually in a counter-current flow from bottom to top) to exchange heat with the pellets and achieve cooling. However, this direct-fall method has technical drawbacks: the pellets fall at a relatively high speed, resulting in a short effective contact time with the cooling air, insufficient heat exchange, and difficulty in achieving ideal cooling effects within a limited space. To compensate for this deficiency, the height of the cooling tower is often increased to extend the residence time of the pellets within the tower, which not only increases equipment manufacturing and installation costs but also increases the space requirements of the plant. Furthermore, during free fall, the pellets accelerate due to gravity, making them prone to violent collisions with the tower walls or other particles, causing pellet breakage and pulverization, reducing product integrity and quality, and potentially posing safety hazards such as dust explosions. Therefore, improvements are necessary. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a cooling device for biomass pellets.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A cooling device for biomass pellets includes a cylindrical tower body and a tower base for supporting the tower body; the top of the tower body is provided with a feed inlet and an exhaust outlet, the bottom of the tower body is provided with a discharge outlet, and the lower part of the tower body is provided with an air inlet; a spiral guide plate is provided inside the tower body, and a column is provided in the middle of the tower body; the outer edge of the guide plate is fixedly connected to the inner wall of the tower body, and the inner edge is fixedly connected to the column, forming a spiral channel.

[0007] As a preferred embodiment of this invention, the guide plate is provided with a plurality of ventilation holes.

[0008] As a preferred technical solution of this utility model, the upper surface of the guide plate is provided with multiple baffles at intervals. The outer side of the baffle contacts the inner wall of the tower, the inner side points to the column, and the upper surface of the baffle is a sloping surface with the outer side higher than the inner side.

[0009] In one preferred embodiment of this invention, the baffle is fixedly connected to the guide plate by bolts.

[0010] As a preferred technical solution of this utility model, the column is a hollow tube with both ends closed. The upper end of the column is fixedly connected to the top surface of the tower body, and the lower end is fixedly connected to the bottom of the tower body through a support rod.

[0011] As a preferred embodiment of this invention, the air inlet is located below the guide plate.

[0012] The above technical solution has the following advantages:

[0013] This application creates a continuous and stable spiral descent channel within the cooling tower by incorporating a spiral guide plate inside the tower and a central column. Under gravity, the biomass pellets spiral downwards along the guide plate at a certain speed, significantly extending their residence time within the cooling area. Simultaneously, cooling air is uniformly introduced from the bottom of the tower, forming sufficient counter-current contact with the pellets along the radial and axial directions of the spiral channel, achieving efficient and uniform heat exchange. This structure effectively overcomes the problems of excessively fast pellet descent speed, short gas-solid contact time, and low cooling efficiency in traditional free-fall cooling towers, avoiding the space and cost burden of blindly increasing tower height to improve cooling effect. Furthermore, the spiral guide plate constrains and buffers the pellet movement path, significantly reducing rapid collisions and impacts during descent, significantly reducing breakage rate and dust generation, and improving the integrity and quality stability of the finished pellets. The overall structure is compact, with uniform airflow distribution and high cooling efficiency, offering multiple beneficial effects such as energy saving, safety, and high yield. Attached Figure Description

[0014] Figure 1 This is a front view of one embodiment of the present utility model;

[0015] Figure 2 for Figure 1 Top view;

[0016] Figure 3 for Figure 2 A sectional perspective view along the center line AA;

[0017] Figure 4 for Figure 3 Enlarged view of section B;

[0018] Figure 5 for Figure 1 A three-dimensional image;

[0019] Figure 6 for Figure 1 3D structural diagram of the central guide vane;

[0020] In the picture:

[0021] 1-Tower body, 2-Tower base, 3-Feed inlet, 4-Exhaust outlet, 5-Discharge outlet, 6-Air inlet, 7-Guide plate, 8-Column, 9-Ventilation hole, 10-Block, 11-Support rod. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1

[0024] As attached Figure 1-6 As shown, a cooling device for biomass pellets includes a cylindrical tower body 1 and a tower base 2 for supporting the tower body 1; the top of the tower body 1 is provided with a feed inlet 3 and an exhaust outlet 4, the bottom of the tower body 1 is provided with a discharge outlet 5, and the lower part of the tower body 1 is provided with an air inlet 6; a spiral guide plate 7 is provided inside the tower body 1, and a column 8 is provided in the middle of the tower body 1; the outer edge of the guide plate 7 is fixedly connected to the inner wall of the tower body 1, and the inner edge is fixedly connected to the column 8, forming a spiral channel; the guide plate 7 extends to the upper part of the tower body 1 to the feed inlet 3 to realize the reception of biomass pellets.

[0025] During operation, biomass pellets fall into the spiral channel from the feed inlet 3 and spiral down along the guide plate 7 under the action of gravity. At the same time, cooling air enters from the air inlet 6 at the bottom of the tower body 1 and flows from bottom to top along the spiral channel, forming a countercurrent heat exchange with the pellets. This structure significantly prolongs the residence time of the pellets in the cooling zone, improves the cooling efficiency, and effectively avoids the breakage problem caused by the free fall of the pellets, thereby improving the yield and system safety.

[0026] As a preferred technical solution in this embodiment, the guide plate 7 is provided with a plurality of ventilation holes 9. The size of the ventilation holes 9 is much smaller than the size of the biomass pellets. Based on the upward spiral airflow formed by the spiral channel, an upward airflow is formed passing through the ventilation holes 9, increasing the contact efficiency with the biomass pellets. This design allows the cooling air to not only rise along the entire channel, but also penetrate the pellet layer at multiple points inside the guide plate 7, forming local disturbances and three-dimensional heat exchange, further enhancing the heat exchange effect between gas and solid, and improving cooling uniformity and overall efficiency.

[0027] In one preferred embodiment, the upper surface of the guide plate 7 is provided with multiple baffles 10 at intervals. The outer side of each baffle 10 contacts the inner wall of the tower body 1, while the inner side points towards the column 8, and its upper surface is sloping with the outer side higher than the inner side. The baffles 10 can slow down the flow rate of the biomass pellets and guide the biomass pellets that have agglomerated outwards due to centrifugal force to the center of the column 8. Through the baffles 10, the pellets are periodically blocked and guided during their spiral descent, effectively controlling their descent speed, preventing local accumulation or deflection, and simultaneously guiding the pellets back to the center of the channel, ensuring uniform airflow distribution and sufficient cooling, further reducing pellet wear and pulverization.

[0028] In one preferred embodiment, the baffle 10 is fixedly connected to the guide plate 7 by bolts. This connection method facilitates the installation, replacement, and maintenance of the baffle 10, and allows for flexible adjustment of the number or position of the baffles 10 according to different particle characteristics, thereby improving the adaptability and service life of the equipment.

[0029] As a preferred technical solution in this embodiment, the column 8 is a hollow tube with both ends closed. The upper end of the column 8 is fixedly connected to the top surface of the tower body 1, and the lower end is fixedly connected to the bottom of the tower body 1 through a support rod 11. The hollow structure reduces the overall weight while maintaining sufficient structural strength; the closed design prevents cooling air or dust from entering the interior of the column 8, causing dust accumulation or corrosion. At the same time, the support structure ensures that the guide plate 7 remains stable during long-term operation, guaranteeing the geometric accuracy and cooling performance of the spiral channel.

[0030] In one preferred embodiment, the air inlet 6 is located below the guide plate 7. This arrangement ensures that the cooling air is fully distributed at the bottom of the guide plate 7 before entering the spiral channel, creating a stable and continuous counter-current cooling environment within the entire spiral channel, thereby improving cooling efficiency and the consistency of particle cooling.

[0031] During operation, high-temperature biomass pellets, after being formed by a briquetting machine, enter the top of the cooling tower through inlet 3. A rotary valve can be installed at inlet 3 to effectively prevent the upward airflow from leaking out of the tower, while ensuring that the pellets enter the tower continuously and uniformly. After falling into the spiral channel formed by the spiral guide plate 7, the pellets slowly spiral downward along the channel under the action of gravity. The surface of the guide plate 7 can be coated with an anti-stick coating to prevent material from adhering to the surface of the guide plate 7. At the same time, ambient temperature cooling air is blown in from the air inlet 6 at the bottom of the tower body 1, passing through the space below the guide plate 7 from bottom to top, and forming sufficient countercurrent contact with the downward pellets through the ventilation holes 9 on the guide plate 7 and the gaps in the spiral channel, achieving efficient heat exchange. The baffles 10 set at intervals on the guide plate 7 further slow down the pellet flow rate and guide the pellets that are offset outward due to centrifugal effect to the center of the channel, improving cooling uniformity and reducing high-speed collision and breakage. The cooled pellets are finally discharged from the outlet 5 at the bottom of the tower 1. The outlet 5 can also be equipped with a rotary valve to prevent backflow of external air and leakage of cooling airflow inside the tower, maintaining the stability of the internal airflow. The hot and humid air discharged from the exhaust port 4 at the top of the tower is connected to a dust removal system through pipelines. After dust removal and dehumidification treatment, the air is discharged in compliance with standards, effectively controlling dust dispersion and ensuring a clean and safe working environment. The entire process achieves efficient, low-loss, and continuous cooling of biomass pellets, combining advantages such as energy saving, environmental protection, and high yield.

[0032] In the description of the above embodiments, for the sake of brevity and clarity, some components and their specific structural details that are not directly related to the core innovations of this utility model have been omitted. These omitted parts all fall within the scope of existing technology, and those skilled in the art can fully implement the design and manufacture of these parts based on their professional knowledge and existing technical materials. Therefore, they will not be described in detail here.

[0033] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A cooling device for biomass pellets, comprising a cylindrical tower body (1) and a tower base (2) for supporting the tower body (1); the top of the tower body (1) is provided with a feed inlet (3) and an exhaust outlet (4), the bottom of the tower body (1) is provided with a discharge outlet (5), and the lower part of the tower body (1) is provided with an air inlet (6); characterized in that: The tower body (1) is provided with a spiral guide plate (7), and the tower body (1) is provided with a column (8) in the middle. The outer edge of the guide plate (7) is fixed to the inner wall of the tower body (1), and the inner edge is fixed to the column (8) to form a spiral channel.

2. The cooling device for biomass pellets according to claim 1, characterized in that: The guide plate (7) is provided with several ventilation holes (9).

3. The cooling device for biomass pellets according to claim 1 or 2, characterized in that: The upper surface of the guide plate (7) is provided with multiple baffles (10) at intervals. The outer side of the baffle (10) is in contact with the inner wall of the tower body (1), the inner side points to the column (8), and its upper surface is a sloping surface with the outer side higher than the inner side.

4. The cooling device for biomass pellets according to claim 3, characterized in that: The stop block (10) is fixed to the guide plate (7) by bolts.

5. The cooling device for biomass pellets according to claim 1 or 2, characterized in that: The column (8) is made of hollow tube with both ends closed. The upper end of the column (8) is fixed to the top surface of the tower body (1), and the lower end is fixed to the bottom of the tower body (1) through the support rod (11).

6. The cooling device for biomass pellets according to claim 3, characterized in that: The column (8) is made of hollow tube with both ends closed. The upper end of the column (8) is fixed to the top surface of the tower body (1), and the lower end is fixed to the bottom of the tower body (1) through the support rod (11).

7. The cooling device for biomass pellets according to claim 1 or 2, characterized in that: The air inlet (6) is located below the guide plate (7).

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