A biomass particle cooling device

Abstract

The application discloses a biomass particle cooling device, which comprises a cooling cylinder, wherein the cooling cylinder comprises a conical cylinder, a first circular ring cylinder and a second circular ring cylinder, the first circular ring cylinder and the second circular ring cylinder form an 8-shaped structure in communication, a rotating shaft is arranged in the conical cylinder, a first mesh plate, a second mesh plate and a third mesh plate connected with the rotating shaft are arranged in the conical cylinder, a blowing nozzle is arranged on the outer wall of the conical cylinder, the central inner cavities of the first circular ring cylinder and the second circular ring cylinder are communicated with a first cold water pipe, and a second cold water pipe is arranged on the outer side, the conical cylinder, the first circular ring cylinder and the second circular ring cylinder are arranged, the first mesh plate, the second mesh plate and the third mesh plate are arranged in the conical cylinder, and the blowing nozzle is arranged on the outer wall of the conical cylinder, after biomass particles enter the conical cylinder from a feeding port, the biomass particles are subjected to rapid air cooling, and then enter the first circular ring cylinder and the second circular ring cylinder to be subjected to indirect water cooling to reduce residual heat, and through the hierarchical cascade cooling mode, the biomass particles can achieve good cooling effect and uniformity.

Description

Technical Field

[0001] This invention belongs to the field of cooling technology, and in particular relates to a biomass pellet cooling device. Background Technology

[0002] Biomass pellets are made from biomass and are a low-carbon, environmentally friendly fuel used in boilers. During the production process, after the biomass pellets are formed by a pellet mill, they need to be cooled using a biomass pellet cooling device before being transported or stored.

[0003] Currently, biomass pellet cooling devices are generally static single-stage cooling devices, which involve placing the biomass into a cooling cylinder and then blowing air to cool it. With this setup, the biomass remains stationary, preventing the internal parts of the biomass from being directly cooled, resulting in uneven cooling and poor cooling effect. Summary of the Invention

[0004] In view of the shortcomings and defects in the prior art, the purpose of this invention is to provide a biomass pellet cooling device that solves the problems of uneven material cooling and poor cooling effect in the prior art biomass pellet cooling devices.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a biomass pellet cooling device, comprising a cooling cylinder, the cooling cylinder including an upper conical cylinder, a lower first annular cylinder communicating with the conical cylinder, and a lower second annular cylinder, the first and second annular cylinders forming a connected figure-eight shape, a top cover being provided at the top of the conical cylinder, a rotating shaft being provided inside the conical cylinder, the upper end of the rotating shaft passing through the top cover and connected to a motor, and a first mesh plate with a W-shaped cross-section being sequentially provided inside the conical cylinder from top to bottom, and a second mesh plate with a W-shaped cross-section being provided. The first, second, and third mesh plates are m-shaped and horizontal, respectively. The centers of the first, second, and third mesh plates are all connected to a rotating shaft, and their edges are rotatably connected to the inner wall of a conical cylinder. The outer wall of the conical cylinder is provided with multiple air nozzles, which are connected to a cold air source. The rotating shaft is provided with fan blades. The top cover is provided with a feed inlet, and the bottom of the second annular cylinder is provided with a discharge outlet. The central cavities of the first and second annular cylinders are both connected to a first cold water pipe, and a second cold water pipe is provided on the outer side of the first and second annular cylinders.

[0006] As a further improvement of the present invention, a connecting rod is provided between the inner cylinder skins at the center of the first annular cylinder and the second cylinder, and a fan blade is provided on the connecting rod.

[0007] As a further improvement of the present invention, the second cold water pipe is arranged in a circuitous manner on the first and second annular cylinders.

[0008] As a further improvement of the present invention, a cold water ball is provided between the second mesh plate and the third mesh plate, and the cold water ball contains cold water.

[0009] As a further improvement of the present invention, the inner walls of the outer shells of the first and second cylinders are provided with serrations.

[0010] As a further improvement of the present invention, exhaust pipes are provided on the conical cylinder, the first annular cylinder, and the second annular cylinder.

[0011] As a further improvement of the present invention, the bottom of the rotating shaft is rotatably connected to the inner cylinder skin of the first annular cylinder.

[0012] As a further improvement of the present invention, fan blades are provided below the rotating shaft.

[0013] As a further improvement of the present invention, the fan blades are arranged to gradually slope downwards from the inside to the outside.

[0014] As a further improvement of the present invention, the first discharge port is provided with a gate valve.

[0015] Compared with existing technologies, the present invention has the following advantages:

[0016] 1. By configuring the cooling cylinder as a conical cylinder, a first annular cylinder, and a second annular cylinder, and by installing a first mesh plate with a W-shaped cross-section, a second mesh plate with an M-shaped cross-section, and a horizontal third mesh plate inside the conical cylinder, and by providing multiple air nozzles on the outer wall of the conical cylinder, after the biomass pellets enter the conical cylinder from the feed inlet, they first undergo air-blown pre-cooling in the area formed above the first mesh plate. Then, they flow downwards through the mesh openings of the first mesh plate into the area between the first and second mesh plates, where they undergo preliminary cooling. Afterwards, they flow downwards from the second mesh plate into the third mesh plate. Above the plate, after undergoing three cooling processes in this area, the biomass flows into the first annular cylinder for further cooling, and then finally enters the second annular cylinder for further cooling. After undergoing multi-stage cooling, the biomass can be discharged from the discharge port. That is, the biomass pellets first undergo multi-stage direct and rapid cooling in the conical cylinder using cold air to quickly reduce the superheat of the biomass, and then enter the first and second annular cylinders for indirect cooling through indirect contact with cold water to gently and slowly reduce the residual heat of the biomass pellets. Through the stepped cooling method, the biomass pellets achieve a better cooling effect and uniformity.

[0017] Furthermore, in the aforementioned multi-stage cooling process, the W-shaped first mesh plate relatively gathers the falling biomass pellets, while the M-shaped second mesh plate corresponds to the W-shaped first mesh plate, causing the gathered biomass pellets to relatively disperse to both sides. The horizontal third mesh plate then relatively flattens the biomass pellets. Throughout this process of gathering, dispersing, and flattening, the relative flow of the biomass pellets is increased. Moreover, this process prolongs the residence time of the biomass pellets within the conical cylinder, increasing the relative contact area between the biomass pellets and the blown-in cold air, thus improving the uniformity of cooling and enhancing overall performance. The cooling effect is achieved through the interaction of the W-shaped first mesh plate and the M-shaped second mesh plate. While fulfilling the aforementioned functions, the first and second mesh plates, driven by the rotation of the shaft, form a fan, accelerating the flow of gas within the conical cylinder and improving the cooling effect. Simultaneously, the first, second, and third mesh plates, under the influence of the cold air blown in from the nozzle, can sway or vibrate to a certain extent, forming a vibration structure. This prevents the mesh from clogging and, during the swaying process, accelerates the relative flow of biomass particles, further enhancing the cooling effect on the biomass.

[0018] The fan blades on the aforementioned rotating shaft function in two ways: firstly, they act like fan blades, fanning the air and improving the cooling effect inside the conical cylinder; secondly, they act like a stirring shaft, agitating the biomass pellets to a certain extent, thus improving the cooling effect and preventing the biomass pellets from being blown away from the air source.

[0019] Furthermore, by setting up a first annular cylinder and a second annular cylinder, and the first and second annular cylinders forming an 8-shape, the biomass, after entering the first annular cylinder from the conical cylinder, is diverted to both sides, gathers at the bottom of the first annular cylinder, and then diverts into the second annular cylinder. When entering the second annular cylinder from the first annular cylinder, some of the biomass on the left side of the first annular cylinder will be guided by the sharp corner at the bottom of the first annular cylinder and will convect into the right side of the second annular cylinder. Similarly, some of the biomass particles on the right side of the first annular cylinder will be guided by the sharp corner at the bottom of the first annular cylinder and will convect into the left side of the second annular cylinder. The biomass forms a convective flow with each other, reducing static compression between biomass particles, increasing the contact area between biomass and refrigerant, and improving the cooling effect and cooling uniformity.

[0020] 2. By installing fan blades on the connecting rod, the biomass falls onto the fan blades during its downward flow. The fan blades deform and swing downward to a certain extent. During this process, the dispersion and relative fluidity of the biomass can be increased, and a fan can be formed. This can also hinder the movement of the biomass to a certain extent, increase the residence time of the biomass in the second annular cylinder, and improve the cooling effect.

[0021] 3. By placing a cold water ball between the second and third mesh plates, the biomass can be more dispersed and cooled down as it falls from the second mesh plate to the third mesh plate, thus improving the cooling effect.

[0022] 4. By providing serrations on the inner walls of the outer shells of the first and second cylinders, the biomass particles can be obstructed, thereby prolonging the biomass residence time and improving the cooling effect. In addition, the relative motion state between biomass particles can be improved through collision, further enhancing the cooling effect.

[0023] 5. By providing exhaust pipes on the conical cylinder, the first annular cylinder, and the second annular cylinder, the hot gas from the biomass particles inside the conical cylinder, the first annular cylinder, and the second annular cylinder can be discharged from the exhaust pipes. Corresponding to the air inlet and the cold water pipe, one enters and the other exits, reducing the heat in the conical cylinder, the first annular cylinder, and the second annular cylinder, and improving the cooling effect.

[0024] 6. By installing fan blades on the rotating shaft, a fan is formed as the fan blades rotate with the shaft, which can cool the biomass pellets. In addition, as the biomass flows downward, it falls onto the fan blades, and the fan blades deform and swing downward to a certain extent. In this process, the dispersion and relative fluidity of the biomass can be increased, and the movement of the biomass can be hindered to a certain extent, thereby increasing the residence time of the biomass in the conical tube and improving the cooling effect.

[0025] 7. By installing a gate valve at the first discharge port, the opening and closing of the first discharge port can be controlled. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings:

[0027] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention;

[0029] In the diagram: 1. Conical cylinder; 2. First annular cylinder; 3. Second annular cylinder; 31. End plate; 32. Outer cylinder skin; 33. Inner cylinder skin; 4. Top cover; 5. Shaft; 6. Motor; 7. First mesh plate; 8. Second mesh plate; 9. Third mesh plate; 10. Air nozzle; 11. Fan blade; 12. Feed inlet; 13. Discharge outlet; 14. Second cold water pipe; 15. Connecting rod; 16. Fan blade; 17. Sawtooth; 18. Exhaust pipe; 19. Gate valve; 20. Cold water ball; 21. First cold water pipe. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-2The present invention will be described in further detail. For clarity, only structures relevant to the inventive aspects of the invention are shown in the figures.

[0031] For ease of description, the coordinate system is defined as follows: Figure 1 As shown, the left and right directions are horizontal, the front and back directions are vertical, and the up and down directions are vertical.

[0032] This invention discloses a biomass pellet cooling device. (Refer to...) Figure 1 and Figure 2 A biomass pellet cooling device includes a cooling cylinder. The cooling cylinder includes an upper conical cylinder 1, a first annular cylinder 2 connected to the conical cylinder 1 at its lower part, and a second annular cylinder 3 at its lower part. The second annular cylinder 3 at the lower part of the first annular cylinder 2 each includes an inner cylinder skin 33, an outer cylinder skin 32, and end plates 31 at both ends. The first annular cylinder 2 and the second annular cylinder 3 form a connected figure-eight shape. A connecting rod 15 is provided between the inner cylinder skin 33 at the center of the first annular cylinder 2 and the second annular cylinder. A fan blade 16 is provided on the connecting rod 15. By providing a fan blade 16 on the connecting rod 15, the biomass falls onto the fan blade 16 during the downward flow. The fan blade 16 deforms and swings downward to a certain extent. During this process, the dispersion and relative fluidity of the biomass can be increased, and the movement of the biomass can be hindered to a certain extent, thereby increasing the residence time of the biomass in the second annular cylinder 3 and improving the cooling effect.

[0033] like Figure 1 and Figure 2 As shown, the top of the conical cylinder 1 is provided with a top cover 4, and the top cover 4 is provided with a feed inlet 12. The bottom of the second annular cylinder 3 is provided with a discharge outlet 13. The first discharge outlet 13 is provided with a gate valve 19, which can control the opening and closing of the first discharge outlet 13. The central inner cavities of the first annular cylinder 2 and the second annular cylinder 3 are both connected to the first cold water pipe 21, that is, the first cold water pipe 21 is connected and set on the end plates 31 of the first annular cylinder 2 and the second annular cylinder 3. A second cold water pipe 14 is provided on the outside of the first annular cylinder 2 and the second annular cylinder 3, and the second cold water pipe 14 is arranged in a meandering manner on the first annular cylinder 2 and the second annular cylinder 3.

[0034] A rotating shaft 5 is installed inside the conical cylinder 1. The upper end of the rotating shaft 5 passes through the top cover 4 and is connected to the motor 6. The bottom of the rotating shaft 5 is rotatably connected to the inner cylinder skin 33 of the first annular cylinder 2. Inside the conical cylinder 1, from top to bottom, there are sequentially arranged a first mesh plate 7 with a W-shaped cross-section, a second mesh plate 8 with an M-shaped cross-section, and a horizontal third mesh plate 9. The centers of the first mesh plate 7, the second mesh plate 8, and the third mesh plate 9 are all connected to the rotating shaft 5, and their edges are rotatably connected to the inner wall of the conical cylinder 1. A cold water ball 20 is installed between the second mesh plate 8 and the third mesh plate 9. The cold water ball 20 contains cold water. During the process of biomass falling from the second mesh plate 8 to the third mesh plate 9, the cold water ball 20 can increase the dispersion of the biomass and simultaneously cool it down, improving the cooling effect. Figure 1 As shown, the outer wall of the conical cylinder 1 is provided with a plurality of air nozzles 10, and the air nozzles 10 are connected to a cold air source.

[0035] The rotating shaft 5 is equipped with fan blades 11. As the shaft rotates, these blades 11 function as two things: first, they act like fan blades 16, providing airflow and improving the cooling effect inside the conical cylinder 1; second, they act as a stirring shaft, agitating the biomass pellets to further enhance cooling and prevent them from being blown away from the air source. Furthermore, fan blades 16 are located below the rotating shaft 5, gradually tilting downwards from the inside out. As the fan blades 16 rotate with the shaft 5, they act as a fan, cooling the biomass pellets. Additionally, as the biomass flows downwards, it falls onto the fan blades 16, causing them to deform and oscillate downwards. This increases the dispersion and relative fluidity of the biomass and hinders its movement, increasing its residence time within the conical cylinder 1 and further improving the cooling effect.

[0036] In addition, the inner walls of the outer shells 32 of the first and second cylinders are provided with serrations 17, which not only hinder the biomass particles and reduce their speed, thereby extending the residence time of the biomass and improving the cooling effect, but also improve the relative motion state between the biomass particles through collision, thus improving the cooling effect.

[0037] In addition, exhaust pipes 18 are provided on the conical cylinder 1, the first annular cylinder 2, and the second annular cylinder 3. The hot gas from the biomass particles inside the conical cylinder 1, the first annular cylinder 2, and the second annular cylinder 3 can be discharged from the exhaust pipes 18. Corresponding to the air inlet and the cold water pipe, one enters and the other exits, reducing the heat in the conical cylinder 1, the first annular cylinder 2, and the second annular cylinder 3 and improving the cooling effect.

[0038] This invention configures the cooling cylinder as a conical cylinder 1, a first annular cylinder 2, and a second annular cylinder 3. Inside the conical cylinder 1, a first mesh plate 7 with a W-shaped cross-section, a second mesh plate 8 with an M-shaped cross-section, and a horizontal third mesh plate 9 are installed. Multiple air nozzles 10 are provided on the outer wall of the conical cylinder 1. After the biomass pellets enter the conical cylinder 1 through the feed inlet 12, they undergo pre-cooling via airflow in the area above the first mesh plate 7. Then, they flow downwards through the mesh openings of the first mesh plate 7 into the area between the first mesh plate 7 and the second mesh plate 8, where they undergo initial cooling. Finally, they flow downwards from above the second mesh plate 8. The biomass pellets enter the area above the third mesh plate 9 and undergo three cooling processes in this region before flowing into the first annular cylinder 2 for further cooling. Finally, they enter the second annular cylinder 3 for further cooling. After undergoing multi-stage cooling, the biomass pellets can be discharged from the discharge port. In other words, the biomass pellets first undergo multi-stage direct and rapid cooling in the conical cylinder 1 using cold air to quickly reduce the superheat of the biomass. Then, they enter the first annular cylinder 2 and the second annular cylinder 3 for indirect cooling through indirect contact with cold water, which gently and slowly reduces the residual heat of the biomass pellets. Through this stepped cooling method, the biomass pellets achieve a better cooling effect and uniformity.

[0039] Furthermore, in the aforementioned multi-stage cooling process, the W-shaped first mesh plate 7 can relatively gather the falling biomass pellets, while the M-shaped second mesh plate 8 corresponds to the W-shaped first mesh plate 7, causing the gathered biomass pellets to relatively disperse to both sides. The horizontal third mesh plate 9 relatively flattens the biomass pellets. Throughout this process of gathering, dispersing, and flattening, the relative flow of the biomass pellets is increased. Moreover, this process prolongs the residence time of the biomass pellets within the conical cylinder 1, increases the relative contact area between the biomass pellets and the blown-in cold air, improves the uniformity of cooling, and enhances the cooling efficiency. However, the W-shaped first mesh plate 7 and the M-shaped second mesh plate 8, while echoing each other and having the above-mentioned functions, can also form a fan under the rotation of the rotating shaft 5, accelerating the flow of gas in the conical cylinder 1, fanning the conical cylinder 1, and improving the cooling effect. At the same time, the first mesh plate 7, the second mesh plate 8, and the third mesh plate 9 can shake or swing to a certain extent under the cold air blown in from the blower nozzle 10, that is, form a vibration structure, avoiding mesh blockage, and in the process of shaking, can accelerate the relative flow of biomass particles, improving the cooling effect on biomass.

[0040] The fan blades 11 on the aforementioned rotating shaft 5, while rotating with the shaft 5, serve two purposes: firstly, they act as fan blades 16, which can fan air and improve the cooling effect inside the conical cylinder 1; secondly, they act as a stirring shaft, which can agitate the biomass pellets to a certain extent, improve the cooling effect of the biomass pellets, and prevent the biomass pellets from being far away from the air source and thus not being able to be blown.

[0041] Furthermore, by setting up a first annular cylinder 2 and a second annular cylinder 3, and ensuring that the first annular cylinder 2 and the second annular cylinder 3 can form a figure-eight shape, the biomass, after entering the first annular cylinder 2 from the conical cylinder 1, is diverted to both sides and gathers at the bottom of the first annular cylinder 2 before being diverted into the second annular cylinder 3. When the biomass enters the second annular cylinder 3 from the first annular cylinder 2, a portion of the biomass on the left side of the first annular cylinder 2 will be guided by the sharp corner at the bottom of the first annular cylinder 2 and will convect into the right side of the second annular cylinder 3. Similarly, the biomass particles on the right side of the first annular cylinder 2 will be guided by the sharp corner at the bottom of the first annular cylinder 2 and will convect into the left side of the second annular cylinder 3. This convective flow between the biomass particles reduces static compression between them, increases the contact area between the biomass and the refrigerant, and improves the cooling effect and the uniformity of cooling.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. It should be understood that the specific embodiments described herein are only for understanding this invention and are not intended to limit this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

Claims

1. A biomass pellet cooling device, characterized in that: The device includes a cooling cylinder comprising an upper conical cylinder, a lower first annular cylinder connected to the conical cylinder, and a lower second annular cylinder. The first and second annular cylinders form a connected figure-eight shape. A top cover is provided at the top of the conical cylinder, and a rotating shaft is provided inside the conical cylinder. The upper end of the rotating shaft passes through the top cover and is connected to a motor. From top to bottom, the conical cylinder is provided with a first mesh plate with a W-shaped cross-section, a second mesh plate with an M-shaped cross-section, and a horizontal third mesh plate. The centers of the first, second, and third mesh plates are all connected to the rotating shaft, and their edges are rotatably connected to the inner wall of the conical cylinder. Multiple air nozzles are provided on the outer wall of the conical cylinder, and the air nozzles are connected to a cold air source. The rotating shaft is provided with fan blades. The top cover is provided with a feed inlet, and the bottom of the second annular cylinder is provided with a discharge outlet. The central cavities of both the first and second annular cylinders are connected to a first cold water pipe, and a second cold water pipe is provided on the outer side of both the first and second annular cylinders.

2. The biomass pellet cooling device according to claim 1, characterized in that: A connecting rod is provided between the inner cylinder skins at the center of the first and second annular cylinders, and a fan blade is provided on the connecting rod.

3. The biomass pellet cooling device according to claim 1, characterized in that: The second cold water pipe is arranged in a circuitous manner on the first and second annular cylinders.

4. The biomass pellet cooling device according to claim 1, characterized in that: A cold water ball is provided between the second and third mesh plates, and the cold water ball contains cold water.

5. A biomass pellet cooling device according to claim 1, characterized in that: The inner walls of the outer casings of the first and second annular cylinders are provided with serrations.

6. A biomass pellet cooling device according to claim 1, characterized in that: Exhaust pipes are provided on the conical cylinder, the first annular cylinder, and the second annular cylinder.

7. A biomass pellet cooling device according to claim 1, characterized in that: The bottom of the rotating shaft is rotatably connected to the inner cylinder skin of the first annular cylinder.

8. A biomass pellet cooling device according to claim 1, characterized in that: Fan blades are located below the rotating shaft.

9. A biomass pellet cooling device according to claim 2 or 8, characterized in that: The fan blades are arranged to gradually slope downwards from the inside out.

10. A biomass pellet cooling device according to any one of claims 1-8, characterized in that: The discharge port is equipped with a gate valve.

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