A flash drier for preventing particle suspension
By introducing a middle cylinder and inner cylinder structure into the flash dryer, an independent fall-off chamber and airflow chamber are constructed. Combined with a two-stage separation design, the problem of particle suspension is solved, drying efficiency and equipment stability are improved, and particle uniformity and consistency are ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGZHOU YOUBO DRYING ENG CO LTD
- Filing Date
- 2026-04-28
- Publication Date
- 2026-06-12
Smart Images
Figure CN122191944A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of flash dryer technology, specifically a flash dryer that prevents particles from becoming suspended. Background Technology
[0002] A flash dryer is a highly efficient continuous drying device that integrates drying, pulverizing, and grading functions. It mainly consists of a vertically positioned drying cylinder. Hot air is blown in at high speed tangentially from the bottom of the cylinder, while the wet material is fed in through the feed inlet at the bottom. A high-speed rotating agitator is installed at the bottom of the drying cylinder. Its functions are twofold: first, to initially pulverize and disperse the wet lumps of material; and second, to drive the hot air to form a strong vortex airflow. Within this high-temperature, high-speed vortex airflow, the wet material rapidly completes the heat and mass transfer process, the moisture evaporates, and the material is dried.
[0003] A classifier is installed at the top of the drying cylinder. The dried material rises to the classifier with the airflow. Fine particles that meet the size requirements pass through the classifier under the airflow and enter the subsequent cyclone separator for collection. Larger particles are blocked by the classifier and fall back to the bottom of the drying cylinder, where they are crushed and dried again by the bottom stirring device, forming a closed loop until the qualified particle size is reached.
[0004] However, in actual operation, it was found that the velocity field of the vortex airflow inside the drying drum is non-uniformly distributed. Typically, from bottom to top, due to energy dissipation and changes in the flow cross-section, the upward velocity and dynamic pressure of the airflow decrease. When larger particles fall from the top, the upward thrust of the airflow gradually increases in the area they pass through during their descent. Therefore, at a certain height along the particle's descent path, a dynamic equilibrium point is reached, where the particle's own gravity and the upward thrust of the airflow on it are balanced. At this point, the particle will no longer continue to fall but will remain suspended in a certain middle position of the drying drum, continuously rotating. These suspended particles cannot fall smoothly to the bottom to be re-crushed, nor can they rise and be discharged through the classifier, forming an ineffective dead zone cycle.
[0005] Therefore, how to improve the internal structure or airflow organization of existing flash dryers to effectively disrupt or avoid the suspension balance of large particles in the middle of the drying cylinder, and ensure that all unqualified particles can fall back to the crushing zone smoothly and quickly, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0006] To address the technical problems in the background art, the present invention discloses a flash dryer for preventing particle suspension.
[0007] The present invention provides a flash dryer for preventing particle suspension, including a drying cylinder with a crushing chamber at the lower end, an air inlet and a feed inlet arranged circumferentially on the side wall of the crushing chamber, and the upper part of the drying cylinder located in the crushing chamber is arranged as a primary separation section and a secondary separation section in sequence. The drying cylinder also contains a middle cylinder and an inner cylinder that extend vertically. The lower end of the middle cylinder extends to the bottom of the first-stage separation section, and the upper end extends to the top of the first-stage separation section; The lower end of the inner cylinder extends to the bottom of the primary separation section, and the upper end extends to the top of the secondary separation section; the portion of the inner cylinder located in the primary separation section is inserted into the middle cylinder. There is a gap between the outer wall of the middle cylinder and the inner wall of the drying cylinder, which forms the first airflow cavity; The inner cylinder and the inner wall of the secondary separation section form a second airflow cavity that communicates with the first airflow cavity; The middle cylinder and the inner cylinder form the first return cavity; The internal space of the inner cylinder forms a second return cavity; A first material collection component is provided at the connection between the primary separation section and the secondary separation section. The primary particles enter the first return chamber under the action of the first material collection component. A second material collection component is provided at the top of the secondary separation section. Secondary particles with a particle size smaller than the primary particles enter the second return chamber under the action of the second material collection component.
[0008] Furthermore, the first material-catching component is a first connecting pipe with a wedge-shaped cross-section; The constricted end of the first connector is connected to the lower end of the secondary separation section, and the flared end is connected to the upper end of the primary separation section.
[0009] Furthermore, the upper end face of the middle cylinder extends to a position flush with the flared end of the first connecting pipe.
[0010] Furthermore, the second material collection assembly includes a second nozzle with a wedge-shaped cross-section; The lower end of the second connector is a flared end, which is connected to the upper end of the secondary separation section.
[0011] Furthermore, the upper end face of the inner cylinder extends to a position flush with the flared end of the second connecting pipe.
[0012] Furthermore, the central axis of the middle cylinder is parallel to but does not coincide with the central axis of the drying cylinder, and is arranged eccentrically.
[0013] Furthermore, the outer wall of the middle cylinder is also equipped with a crushing rod that protrudes outward in a radial direction.
[0014] Furthermore, the crushing rod is positioned in the area with the smallest distance between the middle cylinder and the drying cylinder; The crushing rods are arranged in two rows along the vertical direction; The two rows of crushing rods are staggered in the radial direction of the middle cylinder; there is a gap between the two rows of crushing rods on the radial projection plane of the middle cylinder.
[0015] Furthermore, the radial cross-section of the secondary separation section is wedge-shaped, with its flared end facing upwards.
[0016] Furthermore, the distance between the center axis of the middle cylinder and the center axis of the drying cylinder can be adjusted by means of an adjustable structure; The adjustment structure includes: A screw is installed on the outer wall of the middle cylinder and extends radially along the middle cylinder; the screw replaces part of the crushing rod. The perforation is made on the drying cylinder and corresponds to the position of the screw; A fixing plate is fixed to the outer wall of the drying cylinder; a screw passes through a perforation and extends to the outside of the drying cylinder, and passes through the fixing plate; Locking nuts, threadedly connected to the screw, are distributed on both sides of the fixing plate to lock the position of the screw; The screw is also fitted with a sealing ring and a fixing nut. The sealing ring has a tapered part, which is embedded in the through hole and locked in place by the fixing nut.
[0017] The beneficial effects of this invention are: 1. This invention constructs independent first and second fall-off chambers by setting up a middle cylinder and an inner cylinder. These two fall-off chambers are spatially separated from the first and second airflow chambers that constitute the vortex airflow channel. When particles with unqualified particle sizes are guided into the fall-off chambers by the catcher assembly, they are in relatively independent spaces, avoiding direct contact with the rising airflow of the main vortex. This means that the falling particles are no longer disturbed by the strong upward airflow thrust, ensuring that the particles fall quickly and smoothly to the bottom crushing chamber under the action of gravity alone, completely solving the particle suspension problem.
[0018] 2. This invention adopts a two-stage separation design with a primary separation section and a secondary separation section, and with the material collection components at different positions, it can perform particle size classification treatment on unqualified particles; this classification and fallback mechanism avoids the mixing and interference of particles of different sizes, so that the particles can be more targetedly crushed in the crushing chamber, thereby improving the overall efficiency of the drying and crushing process.
[0019] 3. The vortex airflow channel formed by connecting the first and second airflow chambers ensures that the hot air maintains a stable and continuous vortex motion within the drying cylinder. Simultaneously, the structure of the inner and middle cylinders isolates the fall-off chamber from the main airflow channel, concentrating the vortex airflow in the drying area without interference from falling particles. This maintains high-temperature, high-speed drying conditions while reducing airflow energy loss.
[0020] 4. By eliminating particle suspension, the uniformity and consistency of the finished particle size are improved. At the same time, energy waste and equipment wear caused by ineffective circulation are reduced, enhancing the long-term stability and reliability of the equipment.
[0021] 5. The upper end of the middle cylinder extends to the top of the primary separation section, strictly separating the first airflow chamber from the first return chamber in space. Larger primary particles, blocked in the primary separation section, are precisely guided to the first return chamber by the first material-catching component. The upper end of the inner cylinder extends to the top of the secondary separation section, forming an independent second return chamber within the secondary separation section. Smaller secondary particles, blocked at the top of the secondary separation section by the second material-catching component, are guided into the second return chamber. Due to the isolation provided by the inner cylinder, the secondary particles during the return process are not affected by the upward thrust of the external main vortex airflow, allowing them to quickly and directly pass through the entire height of the drying cylinder under gravity and fall back into the crushing chamber. Attached Figure Description
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a front view of the present invention, with a partial cross-section shown; Figure 4 yes Figure 3 Enlarged view of point B in the middle; Figure 5 This is a front sectional view of the present invention; Figure 6 This is a schematic diagram of the fixed ring structure; Figure 7 This is a schematic diagram of the middle tube structure; In the diagram: 1. Drying cylinder; 2. Crushing chamber; 3. Air inlet; 4. Feed inlet; 5. Primary separation section; 6. Secondary separation section; 7. Middle cylinder; 8. Inner cylinder; 9. First airflow chamber; 10. Second airflow chamber; 11. First return chamber; 12. Second return chamber; 13. First connecting pipe; 14. Second connecting pipe; 15. Crushing rod; 16. Fixing ring; 17. Stirring device; 18. Screw; 19. Fixing plate; 20. Locking nut; 21. Sealing ring; 22. Fixing nut; 23. Perforation. Detailed Implementation
[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.
[0025] like Figure 1 and Figure 5 As shown, this invention discloses a flash dryer for preventing particle suspension, comprising a drying cylinder 1 extending vertically. A crushing chamber 2 is provided at the lower end of the drying cylinder 1, and air inlets 3 and feed inlets 4 are spaced circumferentially on the side wall of the crushing chamber 2. Hot air enters the crushing chamber 2 tangentially from the air inlets 3, and the material is conveyed into the crushing chamber 2 by a screw conveyor. A stirring device 17 is also provided inside the crushing chamber 2, consisting of a stirring paddle connected by a transmission rod and a reduction motor. The rotation of the stirring paddle crushes the material and drives the hot air to form a vortex airflow, drying the material and driving it to the outlet at the top of the drying cylinder 1, where it sequentially enters a cyclone separator and a bag filter for collection.
[0026] Above the crushing chamber 2, the drying cylinder 1 has a vertically arranged primary separation section 5 and a secondary separation section 6. Inside the drying cylinder 1, there is also a vertically extending middle cylinder 7 and an inner cylinder 8. The lower end of the middle cylinder 7 extends to the bottom of the primary separation section 5, and the upper end extends to the top of the primary separation section 5. The lower end of the inner cylinder 8 extends to the bottom of the primary separation section 5, and the upper end extends to the top of the secondary separation section 6. The portion of the inner cylinder 8 located in the primary separation section 5 is inserted into the middle cylinder 7, and the two are arranged coaxially. A gap exists between the outer wall of the middle cylinder 7 and the inner wall of the drying cylinder 1, forming a first airflow chamber 9. A gap also exists between the outer wall of the portion of the inner cylinder 8 located in the secondary separation section 6 and the inner wall of the drying cylinder 1, forming a second airflow chamber 10. The first airflow chamber 9 and the second airflow chamber 10 are connected to form a vortex airflow channel. A first fall-off chamber 11 is formed between the middle cylinder 7 and the inner cylinder 8. The internal space of the inner cylinder 8 forms a second fall-off chamber 12.
[0027] like Figure 5 As shown, the drying cylinder 1 and the middle cylinder 7 are both connected and fixed by retaining rings 16, as follows. Figure 6 As shown, the fixing ring 16 includes an outer ring and an inner ring, which are connected and fixed by a connecting rod. The outer ring abuts against the inner wall of the drying cylinder 1 and is fixed by welding. The inner ring is sleeved on the outer wall of the middle cylinder 7 and is also fixed by welding. Similarly, the middle cylinder 7 and the inner cylinder 8 are also connected and fixed by the fixing ring 16.
[0028] A first material-catching assembly is provided at the connection between the primary separation section 5 and the secondary separation section 6. Primary particles that do not meet the particle size requirements enter the first return chamber 11 under the action of the first material-catching assembly and fall back to the crushing chamber 2. In this embodiment, the first material-catching assembly is a first connecting pipe 13 with a wedge-shaped cross-section; the constricted end of the first connecting pipe 13 is connected to the lower end of the secondary separation section 6, and the flared end is connected to the upper end of the primary separation section 5. The first connecting pipe 13 is located within the projection range of the middle cylinder 7 when projected axially onto the drying cylinder 1, so that the first particles can stably fall into the first return chamber 11.
[0029] A second material collection assembly is provided at the top of the secondary separation section 6. Secondary particles that are not up to standard in size and are smaller than the primary particles enter the second return chamber 12 under the action of the second material collection assembly and fall back into the crushing chamber 2. In this embodiment, the second material collection assembly is a second connecting pipe 14 with a wedge-shaped cross-section; the lower end of the second connecting pipe 14 is a flared end, which is connected to the upper end of the secondary separation section 6. In the axial projection of the drying cylinder 1, the second connecting pipe 14 is located within the projection range of the inner cylinder 8 so that the secondary particles can fall stably into the second return chamber 12.
[0030] The wedge-shaped structure of the first and second nozzles 13 and 14 provides specific guidance for the vortex airflow. When the airflow carrying particles passes through the nozzles with varying cross-sections, the airflow velocity and direction change. For substandard primary particles, the airflow diffusion or abrupt change in direction at the wedge-shaped structure of the first nozzle 13 weakens its carrying capacity. Moreover, primary particles, being heavier, preferentially overcome the thrust of the airflow, making them easier to be ejected from the mainstream airflow under inertia and guided into the first return chamber 11. Similarly, the second nozzle 14 achieves similar separation for finer secondary particles. This structure utilizes the difference in motion between the gas and solid phases in the variable cross-section flow channel to achieve active and efficient interception and separation of substandard particles.
[0031] The upper end face of the middle cylinder 7 extends to a position flush with the flared end of the first connecting pipe 13, thus strictly separating the first airflow chamber 9 and the first return chamber 11 in space. Larger primary particles, after being blocked in the primary separation section 5, can be accurately guided to the first return chamber 11 by the first material collection component.
[0032] The upper end face of the inner cylinder 8 extends to a position flush with the flared end of the second connecting pipe 14, thus forming an independent second return chamber 12 within the secondary separation section 6. Smaller secondary particles are blocked by the second connecting pipe 14 at the top of the secondary separation section 6 and then guided into the second return chamber 12. Due to the isolation provided by the inner cylinder 8, the secondary particles during the return process are not affected by the upward thrust of the external main vortex airflow and can quickly and directly pass through the entire height of the drying cylinder 1 under the action of gravity, returning to the crushing chamber 2.
[0033] The arrangement of the middle cylinder 7 and the inner cylinder 8 creates independent first and second fall-off chambers 11 and 12. These two fall-off chambers are spatially separated from the first and second airflow chambers 9 and 10 that constitute the vortex airflow channel. When particles with unqualified particle sizes are guided into the fall-off chambers by the catcher assembly, they are in relatively independent spaces, avoiding direct contact with the rising airflow of the main vortex. This means that the falling particles are no longer disturbed by the strong upward airflow thrust, ensuring that the particles fall quickly and smoothly to the bottom crushing chamber 2 under the action of gravity alone, completely solving the particle suspension problem.
[0034] The dual-stage separation design of the primary separation section 5 and the secondary separation section 6, combined with the material collection components at different positions, can classify unqualified particles by size. This classification and fallback mechanism avoids the mixing and interference of particles of different sizes, allowing the particles to be crushed more effectively in the crushing chamber 2, thereby improving the overall efficiency of the drying and crushing process.
[0035] The vortex airflow channel formed by connecting the first airflow chamber 9 and the second airflow chamber 10 ensures that the hot air maintains a stable and continuous vortex motion within the drying cylinder 1. At the same time, the structure of the inner cylinder 8 and the middle cylinder 7 isolates the fall-off chamber from the main airflow channel, allowing the vortex airflow to concentrate in the drying area without being disturbed by the falling particles, thus maintaining high-temperature and high-speed drying conditions while reducing airflow energy loss.
[0036] In summary, this invention improves the uniformity and consistency of finished particles by eliminating particle suspension. Simultaneously, it reduces energy waste and equipment wear caused by ineffective circulation, enhancing the long-term stability and reliability of the equipment.
[0037] If the middle cylinder 7 and the drying cylinder 1 are arranged coaxially, the width of the vortex airflow channel is consistent, and the airflow easily forms a rigid rotation, resulting in a relatively stable airflow velocity gradient near the inner and outer walls. This often leads to some gas rising vertically along the wall of the middle cylinder 7, reducing radial mixing of the airflow. Therefore, in this embodiment, the central axis of the middle cylinder 7 is parallel to but not coincident with the central axis of the drying cylinder 1, arranged eccentrically. Thus, the annular channel of the vortex airflow becomes a wedge-shaped channel with one side wider and the other narrower. When the airflow flows into the narrow region, the velocity increases sharply and the static pressure decreases; when the airflow flows into the wide region, the velocity is relatively slower and the static pressure is higher. This non-uniform pressure distribution forces the airflow not only to move in a circular motion but also to generate secondary flow in the wide and narrow regions, thereby enhancing the degree of turbulence. Moreover, in the narrow gap region, due to the smaller flow cross-sectional area, according to the continuity equation, both the axial velocity and tangential velocity of the airflow will increase significantly. What might have been a relatively uniform and smooth spiral in the concentric circles is now transformed. Under the influence of eccentricity, the helix is compressed and stretched, causing the spiral angle to become steeper in the narrow region, pushing the airflow upwards; in the wide region, the airflow swirls. This change transforms the spiral flow from a simple laminar spiral into a complex spiral flow with strong vortices and disturbances. This intense airflow disturbance continuously disrupts the boundary layer on the outer wall of the middle cylinder 7 and the inner wall of the drying cylinder 1, preventing the airflow from flowing only in the middle region and stagnating in the wall-hugging region.
[0038] When the airflow enters the secondary separator 6, the flow cross-sectional area suddenly decreases because the diameter of the secondary separator 6 is smaller than that of the primary separator 5, resulting in a sharp increase in airflow velocity and a significant rise in dynamic pressure. At this time, the upward thrust experienced by the secondary particles in the high-speed airflow is greatly enhanced, easily exceeding their own weight, making it difficult for them to escape the airflow and fall. Therefore, the radial cross-section of the secondary separator 6 is wedge-shaped, with its flared end facing upward.
[0039] To further improve the crushing effect of the material, a radially protruding crushing rod 15 is also provided on the outer wall of the middle cylinder 7. The crushing rod 15 is located in the area with the smallest distance between the middle cylinder 7 and the drying cylinder 1. The airflow channel in this area is relatively narrow, the vortex airflow velocity is high, and the turbulence intensity is large. The probability of material particles colliding with the crushing rod 15 when they are carried by the airflow in this area is significantly increased. This high probability of collision provides the material with additional mechanical crushing opportunities, especially for particles that have not been fully dried or still have a tendency to agglomerate during the upward movement, which can be further crushed by impact.
[0040] like Figure 7 As shown, two rows of crushing rods 15 are arranged vertically; the two rows of crushing rods 15 are staggered radially in the middle cylinder 7. This staggered arrangement creates discontinuous, interleaved crushing points along the material's upward path. As the material spirals upward with the vortex airflow, it will collide sequentially with the two rows of crushing rods 15 at different radial positions, preventing the material from moving along a single trajectory and potentially bypassing the crushing structure. This significantly increases the coverage and frequency of mechanical impact on the material during its ascent, enhancing the uniformity and thoroughness of secondary crushing.
[0041] On the radial projection surface of the middle cylinder 7, there is a gap between the two rows of breaking rods 15. This gap design ensures that the airflow channel will not be blocked and can still flow steadily upward.
[0042] Since different materials have different physical properties, the required crushing force is also different. Therefore, the distance between the axis of the middle cylinder 7 and the axis of the drying cylinder 1 can be adjusted by the adjustment structure. This adjustment structure replaces the fixing ring 16 that connects the drying cylinder 1 and the middle cylinder 7.
[0043] like Figure 2 , Figure 3 and Figure 4As shown, the adjusting structure includes a screw 18 and a locking nut 20. The screw 18 is fixed to the outer wall of the middle cylinder 7 by welding and extends radially along the middle cylinder 7; the screw 18 replaces part of the crushing rod 15. Multiple through holes 23 are provided on the drying cylinder 1 for the screw 18 to pass through. An L-shaped fixing plate 19 is also welded to the drying cylinder 1, with its vertical portion extending downwards. The screw 18 passes through the through holes 23 and extends to the outside of the drying cylinder 1, passing through the fixing plate 19. The locking nuts 20 are threadedly connected to the screw 18 and are distributed on both sides of the fixing plate 19 to lock the position of the screw 18.
[0044] The perforation 23 will cause the drying cylinder 1 to leak. Therefore, a sealing ring 21 and a fixing nut 22 are also fitted on the screw 18. The sealing ring 21 has a tapered part, which is embedded in the perforation 23 and locked in place by the fixing nut 22.
[0045] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A flash dryer for preventing particle suspension, comprising a drying cylinder (1) with a crushing chamber (2) at its lower end, wherein an air inlet (3) and a feed inlet (4) are provided circumferentially spaced on the side wall of the crushing chamber (2), characterized in that: The drying cylinder (1) located on the upper part of the crushing chamber (2) is sequentially configured as a primary separation section (5) and a secondary separation section (6). The drying cylinder (1) is also provided with a middle cylinder (7) and an inner cylinder (8) extending in a vertical direction. The lower end of the middle cylinder (7) extends to the bottom of the first-stage separation section (5), and the upper end extends to the top of the first-stage separation section (5); The lower end of the inner cylinder (8) extends to the bottom of the first-stage separation section (5), and the upper end extends to the top of the second-stage separation section (6); the portion of the inner cylinder (8) located in the first-stage separation section (5) is inserted into the middle cylinder (7); There is a gap between the outer wall of the middle cylinder (7) and the inner wall of the drying cylinder (1), which forms the first airflow cavity (9). The inner wall of the inner cylinder (8) and the secondary separation section (6) form a second airflow cavity (10) that communicates with the first airflow cavity (9). The middle cylinder (7) and the inner cylinder (8) form a first fall-back cavity (11); The internal space of the inner cylinder (8) forms the second fall-back cavity (12); A first material collection component is provided at the connection between the primary separation section (5) and the secondary separation section (6), and the primary particles enter the first return chamber (11) under the action of the first material collection component. The top of the secondary separation section (6) is provided with a second material collection component. Secondary particles with a particle size smaller than the primary particles enter the second return chamber (12) under the action of the second material collection component.
2. The flash dryer for preventing particle suspension according to claim 1, characterized in that: The first material collection component is a first pipe (13) with a wedge-shaped cross-section. The constricted end of the first connector (13) is connected to the lower end of the secondary separation section (6), and the flared end is connected to the upper end of the primary separation section (5).
3. A flash dryer for preventing particle suspension according to claim 2, characterized in that: The upper end face of the middle cylinder (7) extends to a position flush with the flared end of the first connecting pipe (13).
4. A flash dryer for preventing particle suspension according to claim 1, characterized in that: The second material collection assembly includes a second nozzle (14) with a wedge-shaped cross-section; The lower end of the second connector (14) is a flared end, which is connected to the upper end of the secondary separation section (6).
5. A flash dryer for preventing particle suspension according to claim 4, characterized in that: The upper end face of the inner cylinder (8) extends to a position flush with the flared end of the second connecting pipe (14).
6. A flash dryer for preventing particle suspension according to claim 1, characterized in that: The central axis of the middle cylinder (7) is parallel to and does not coincide with the central axis of the drying cylinder (1), and is arranged eccentrically.
7. A flash dryer for preventing particle suspension according to claim 6, characterized in that: The outer wall of the middle cylinder (7) is also provided with a crushing rod (15) that protrudes outward in a radial direction.
8. A flash dryer for preventing particle suspension according to claim 7, characterized in that: The crushing rod (15) is located in the area with the smallest distance between the middle cylinder (7) and the drying cylinder (1); The crushing rod (15) is arranged in two rows along the vertical direction; The two rows of crushing rods (15) are arranged in a staggered manner in the radial direction of the middle cylinder (7); there is a gap between the two rows of crushing rods (15) on the radial projection plane of the middle cylinder (7).
9. A flash dryer for preventing particle suspension according to claim 2, characterized in that: The radial cross-section of the secondary separation section (6) is wedge-shaped, with its flared end facing upwards.
10. A flash dryer for preventing particle suspension according to claim 6, characterized in that: The distance between the center of the middle cylinder (7) and the center of the drying cylinder (1) can be adjusted by adjusting the structure; The adjustment structure includes: A screw (18) is disposed on the outer wall of the middle cylinder (7) and extends radially along the middle cylinder (7); the screw (18) replaces part of the crushing rod (15). A perforation (23) is formed on the drying cylinder (1) and corresponds to the position of the screw (18); A fixing plate (19) is fixed to the outer wall of the drying cylinder (1); the screw (18) passes through the perforation (23) and extends to the outside of the drying cylinder (1), and passes through the fixing plate (19). Locking nuts (20) are threaded to the screw (18) and distributed on both sides of the fixing plate (19) to lock the position of the screw (18); The screw (18) is also fitted with a sealing ring (21) and a fixing nut (22). The sealing ring (21) has a tapered part, which is embedded in the through hole (23) and locked and fixed by the fixing nut (22).