A baffle mixed type vibration fluidized bed drying device

Abstract

The application discloses a baffle mixed type vibration fluidized bed drying device, which comprises a mounting rack, an air distribution chamber, a fluidized chamber body, a dust removal cover, an air distribution plate, a baffle mechanism and a vibration motor. The air distribution chamber is fixedly connected to the mounting rack, and at least one hot air inlet is arranged on the sidewall of the air distribution chamber. The fluidized chamber body is correspondingly arranged above the air distribution chamber, and the dust removal cover is correspondingly arranged at the top end of the fluidized chamber body. The air distribution plate is fixedly arranged between the air distribution chamber and the fluidized chamber body, and the air distribution plate is uniformly provided with air distribution holes. The baffle mechanism comprises a plurality of groups which are alternately and symmetrically arranged on the two sidewalls of the fluidized chamber body at a certain angle. The fluidized material particles in the fluidized chamber body flow from the machine head to the machine tail along the baffle path formed by the baffle mechanism. The application can strengthen the mixing effect of the material layer by vertical baffle during the residence time of the fluidized bed, prolong the residence time of the material in the drying area, and improve the drying efficiency of the drying device and the uniformity of the drying product quality.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a baffled mixing vibrating fluidized bed drying device. Background Technology

[0002] Vibrating fluidized bed dryers are widely used in the chemical, pharmaceutical, mining, grain, and food industries for drying moist materials due to their excellent heat and mass transfer efficiency. They are particularly suitable for drying high-humidity, easily agglomerated, fibrous, and difficult-to-fluidize materials. In conventional vibrating fluidized bed dryers, the residence time of the material in the bed is mainly adjusted by vibration parameters and the opening angle of the air distribution plate. This adjustment range is limited, and an excessively short residence time will result in insufficient product moisture content and low drying efficiency. Furthermore, the mixing uniformity of the material layer in a conventional vibrating fluidized bed depends on the fluidization effect of the material, which severely restricts the drying effect and product quality uniformity for materials with poor fluidization characteristics or thick material layers. Increasing the thickness of the material bed during drying can increase the unit throughput and drying thermal efficiency. However, increasing the material bed thickness brings many problems. The vibration energy directly transmitted to the material bed by the air distribution plate gradually decreases with increasing bed height, resulting in significant differences in fluidization quality and heat and mass transfer efficiency between the upper and lower parts of the bed. Simultaneously, since the drying gas is fed from the bottom of the bed, after passing through the thick material bed and undergoing heat and mass exchange, the temperature and relative humidity of the drying gas will form a gradient along the bed height, causing the material at different heights to be under different drying conditions. However, the vertical mixing rate of the material bed in conventional vibrating fluidized bed dryers is difficult to control, especially in cases of poor material fluidization or thick material beds, which leads to poor mixing, resulting in uneven moisture content in the dried product and localized overheating, particularly unfavorable for drying heat-sensitive materials. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a baffled mixing vibrating fluidized bed drying device that can guide the material to be dried to undergo vertical baffles several times during the residence time in the fluidized bed, thereby enhancing the vertical mixing effect of the material layer, ensuring that the material is in a time-uniform drying condition during the residence time, and realizing the control of the residence time of the material in the drying zone within a large range, thus improving the drying efficiency of the drying device and the uniformity of the dried product quality.

[0004] Technical solution: The present invention provides a baffled mixing vibrating fluidized bed drying device, the drying device comprising: Install rack; A distribution chamber, which is fixedly connected to the mounting frame and has at least one hot air inlet along the side wall of the distribution chamber; A fluidizing chamber is installed above the air distribution chamber, and a feeding hopper is provided at the top of the machine head. A dust removal hood is installed at the top of the fluidization chamber, and at least one exhaust pipe is provided along the length of the top of the dust removal hood. An air distribution plate is fixedly installed between the air distribution chamber and the fluidization chamber, and air distribution holes are evenly distributed on the air distribution plate; The flow deflector mechanism includes multiple sets of baffles that are alternately and symmetrically installed at a certain angle on both sides of the fluidized chamber. Fluidized material particles in the fluidized chamber flow from the head to the tail along the flow deflector path formed by the baffle mechanism. A vibration motor is fixedly connected to the side wall of the air distribution chamber.

[0005] Preferably, the baffle mechanism includes a baffle groove inclined along the side wall of the fluidizing chamber, a baffle is slidably connected to the baffle groove inside the fluidizing chamber, a support rod is slidably connected to the outer end of the baffle in the baffle groove, a sleeve is fitted on the outer end of the support rod, and an adjusting screw is fixedly connected to one side of the sleeve; A support frame is provided on the outer side of the fluidization chamber body corresponding to the adjusting screw. The adjusting screw is fixedly connected to the support frame by a positioning nut. Rotating the positioning nut drives the gap between the adjusting screw and the support frame, which in turn drives the baffle to slide along the baffle groove for adjustment.

[0006] Preferably, the baffle is a perforated plate, and the pore diameter and open area ratio of the perforated plate are determined based on the average diameter of the material.

[0007] Preferably, a high-temperature resistant sealing strip is provided between the baffle and the baffle groove, and the high-temperature resistant sealing strip blocks the guide groove of the baffle groove.

[0008] Preferably, the air distribution plate is provided with a discharge port at its tail end, and the mounting frame is provided with a discharge pipe corresponding to the discharge port at its tail end; The feeding hopper is sealed to the discharge port of the rotary valve feeder via a flexible connection, and the discharge pipe is sealed to the inlet end of the rotary valve discharger via a flexible connection. The exhaust pipe is sealed to the cyclone separator and dust collector via a flexible hose.

[0009] Preferably, a set of baffle mechanisms is provided on the lower side of the fluidization chamber near the discharge port, so that the dried material overflows through the upper edge of the baffles and enters the discharge pipe for discharge.

[0010] Preferably, the baffle plate and the air distribution plate form an angle of 45° to 75°.

[0011] Preferably, the fluidized bed further includes a support base, on which four sets of spring feet are provided; The mounting frame includes four sets of connecting feet, which are fixedly connected to spring feet.

[0012] Preferably, the air distribution chamber is divided into several independent air inlet chambers along its length by vertical partitions, and each air inlet chamber is provided with a corresponding hot air inlet.

[0013] Preferably, the air distribution chamber, air distribution plate and fluidization chamber are fixedly connected by bolt assembly, and the connection surface is sealed with high temperature resistant rubber gasket.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The drying device of the present invention guides the material to undergo multiple vertical flow mixing during the drying process by setting multiple baffles arranged in a baffle path inside the fluidized bed, so that the material is in a time-uniform drying condition during the residence time, thereby improving the drying efficiency of the drying device and the uniformity of the dried product quality. By adjusting the position of the baffles on the side wall of the fluidized bed, the residence time of the material in the fluidized bed can be controlled over a wide range, which has good adaptability and drying effect for materials with high humidity, poor fluidization effect, and heat sensitivity. At the same time, it can achieve efficient mixing and uniform drying of materials in the case of thick material layer drying, thereby improving the throughput and energy efficiency of the vibrating fluidized bed drying device. 2. During the drying of a thick material layer in a vibrating fluidized bed, the baffle mechanism enables the material to be dynamically and efficiently mixed in the form of circulation and convection in the thickness direction of the fluidized bed, thereby achieving a time-uniform drying condition for the material during the residence time and ensuring the uniformity and stability of the final product's moisture or other properties. 3. The air distribution chamber is divided into multiple independent air inlet chambers along its length by vertical partitions. Air inlets connected to the independent air inlet chambers are set along the circumferential side walls of the air distribution chamber. The air velocity and gas temperature of each air inlet chamber can be flexibly adjusted according to the requirements of the final dried material, and the air distribution can be more uniform. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the drying device according to an embodiment of the present invention; Figure 2 for Figure 1 Main structural view of the intermediate flow deflector mechanism; Figure 3 for Figure 2 Side view of the structure of the middle baffle mechanism.

[0016] Reference numerals in the attached drawings: 1. Support base; 2. Spring foot; 3. Vibration motor; 4. Mounting frame; 5. Air distribution chamber; 6. Fluidization chamber; 7. Baffle mechanism; 8. Feed hopper; 9. Dust hood; 10. Exhaust pipe; 11. Air distribution plate; 12. Discharge pipe; 13. Hot air inlet; 14. Baffle; 15. Baffle groove; 16. Support rod; 17. Adjusting screw; 18. Support frame; 19. Sleeve; 20. Positioning nut; 21. Connecting foot. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-3 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, this invention discloses a baffled mixing vibrating fluidized bed drying device. The drying device includes a mounting frame 4 and a support base 1. Four sets of spring feet 2 are mounted on the support base 1. The mounting frame 4 includes four sets of connecting feet 21, which are fixedly connected to the spring feet 2. The spring feet 2 can be metal springs, rubber springs, or other types of elastic supports, serving as vibration isolation. An air distribution chamber 5 is fixedly installed at the lower part of the mounting frame 4. The air distribution chamber 5 is divided into multiple independent air inlet chambers along its length by vertical partitions. Each air inlet chamber has a corresponding hot air inlet 13, allowing for flexible adjustment of the air velocity and temperature of each air inlet chamber according to the final material drying requirements. Two sets of vibrating motors 3 with the same phase angle are respectively installed on the side walls of the air distribution chamber 5. The vibration frequency of the vibrating motors 3 is adjusted by a frequency converter.

[0019] A fluidizing chamber 6 is mounted on the mounting frame 4 above the air distribution chamber 5. A feeding hopper 8 is located at the top of the fluidizing chamber 6. A dust collector hood 9 is also mounted on the top of the fluidizing chamber 6, with at least one exhaust pipe 10 along the length of the top of the dust collector hood 9. An air distribution plate 11 is fixedly installed between the air distribution chamber 5 and the fluidizing chamber 6. The air distribution plate 11 has evenly distributed air distribution holes to ensure uniform air distribution. A discharge port is located at the tail end of the air distribution plate 11, and a discharge pipe 12 is located at the tail end of the mounting frame 4 corresponding to the discharge port. The feeding hopper 8 is flexibly and sealed to the discharge port of the rotary valve feeder, and the discharge pipe 12 is flexibly and sealed to the inlet of the rotary valve discharger. The exhaust pipe 10 is flexibly and sealed to the cyclone separator and dust collector. This fluidized bed 6 can meet the requirements of gas-solid separation and gas recycling during the drying process, reduce the mass of the vibrating material, and keep the fluidized bed sealed during feeding, emptying, and discharging to prevent airflow and dust from overflowing. The air distribution chamber 5, air distribution plate 11, fluidized bed 6, and dust collector hood 9 are fixedly connected by bolt assemblies, and the connection surfaces are sealed with high-temperature resistant rubber gaskets for easy installation and maintenance.

[0020] Multiple sets of baffle mechanisms 7 are symmetrically and alternately installed at certain angles on both sides of the fluidization chamber 6. The number, position, and angle of these baffles are flexibly adjusted according to the bed length, material fluidization characteristics, and final product moisture requirements. Figure 1 As shown, two rows of baffle mechanisms 7 are arranged on the upper and lower sides of one side wall of the fluidization chamber 6, and the upper and lower rows of baffle mechanisms 7 are staggered. Each baffle mechanism 7 forms an angle of 45° to 75° with the surface of the air distribution plate 11, which is the tilt angle of the baffle mechanism 7. During operation, when the material to be dried enters the fluidized chamber 6 from the feeding hopper 8, it is guided by multiple sets of baffle mechanisms 7. The fluidized material particles in the fluidized chamber 6 flow from the head to the tail along the baffle path formed by the baffle mechanisms 7. This guides the fluidized material to be conveyed towards the discharge port along an approximately wavy path (baffle path) under the dual action of vibration drive and pressure difference diffusion. Multiple vertical baffles occur during the residence time, thereby enhancing the dynamic mixing effect of the material and ensuring that the material is under time-uniform drying gas conditions during the drying process, thus ensuring the uniformity of product moisture content. At the same time, the baffle mechanism 7 can effectively control the residence time of the material in the fluidized chamber 6, thereby flexibly adjusting the moisture content of the dried product.

[0021] like Figures 2-3In the illustrated embodiment, the baffle mechanism 7 includes a baffle groove 15 inclined along the side wall of the fluidizing chamber 6. A baffle 14 is slidably connected to the inner side of the fluidizing chamber 6 via the baffle groove 15. A support rod 16 is slidably connected to the outer end of the baffle 14 within the baffle groove 15. A sleeve 19 is fitted onto the outer end of the support rod 16. An adjusting screw 17 is fixedly connected to one side of the sleeve 19. A support frame 18 is provided on the outer side of the side wall of the fluidizing chamber 6 corresponding to the adjusting screw 17. The adjusting screw 17 is fixedly connected to the support frame 18 via a positioning nut 20. By rotating the positioning nut 20, the distance between the adjusting screw 17 and the support frame 18 is driven to slide the baffle 14 along the baffle groove 15 for adjustment, thereby adjusting the position of the baffle 14 on the side wall of the fluidizing chamber and changing the conveying speed and residence time of the material in the fluidizing chamber. The baffle 14 is a perforated plate, and the pore size and porosity of the perforated plate are determined based on the average diameter of the material, allowing the drying gas to pass through the baffle 14 to fluidize and dry the material above the baffle. A high-temperature resistant sealing strip is provided between the baffle 14 and the baffle slide 15. The high-temperature resistant sealing strip seals the guide groove of the baffle slide 15, that is, as the baffle 14 slides along the baffle slide 15, the guide groove of the baffle slide 15 is in a sealed state to prevent dust from overflowing.

[0022] A set of baffle mechanism 7 is set on the lower side of the fluidizing chamber 6 near the discharge port, so that the dried material can overflow into the discharge pipe 12 only after passing the upper edge of the baffle 14. This avoids the material layer from collapsing rapidly when it is close to the discharge port, which would cause a significant decrease in the material layer thickness and an increase in the material conveying speed. This ensures that the material is in a uniform and stable fluidization state in the fluidizing chamber 6 and improves the drying efficiency.

[0023] The working principle or method of this invention: The vibration motor 3 is started to drive the mounting frame 4 to reciprocate along its length with a specific amplitude and frequency, causing the air distribution chamber 5, fluidizing chamber 6, and air distribution plate 11 to reciprocate in the horizontal plane. External drying hot gas enters the air distribution chamber 5 through the hot air inlet 13, and then, after being evenly dispersed by the air distribution plate 11, enters the fluidizing chamber to fluidize and dry the material. The material to be dried is distributed from the feed hopper 8 to the air distribution plate 11 by a star feeder at a set feeding speed, and under the combined action of vibration and drying hot airflow, a fluidized material layer of a certain thickness is formed, achieving material fluidization and drying. The fluidized material enters with the hot air and flows from the head to the tail of the machine along the baffle path formed by the baffle mechanism 7. This guides the fluidized material to be conveyed towards the discharge port along an approximately wavy path (baffle path) under the dual action of vibration drive and pressure difference diffusion. Multiple vertical baffles occur during the residence time, thereby enhancing the dynamic mixing effect of the material and ensuring that the material is under time-uniform drying gas conditions during the drying process, thus ensuring the uniformity of product moisture content. At the same time, the baffle mechanism 7 can effectively control the residence time of the material in the fluidization chamber 6, thereby flexibly adjusting the moisture content of the dried product.

[0024] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A baffled mixing type vibrating fluidized bed drying device, characterized in that, The drying device includes: Mounting rack (4); Air distribution chamber (5), the air distribution chamber (5) is fixedly connected to the mounting frame (4), and at least one hot air inlet (13) is provided along the side wall of the air distribution chamber (5); the air distribution chamber (5) is divided into several independent air inlet chambers along its length by vertical partitions, and each air inlet chamber is provided with a corresponding hot air inlet (13); fluidization chamber (6), the fluidization chamber (6) is installed above the air distribution chamber (5), and a feeding hopper (8) is provided at the top of the machine head; Dust hood (9) is installed at the top of the fluidization chamber (6) and at least one exhaust pipe (10) is provided along the length of the top of the dust hood (9). Air distribution plate (11), the air distribution plate (11) is fixedly installed between the air distribution chamber (5) and the fluidization chamber (6), the air distribution plate (11) is evenly distributed with air distribution holes; the tail end of the air distribution plate (11) is provided with a discharge port, and the tail end of the mounting frame (4) is provided with a discharge pipe (12) corresponding to the discharge port; baffle mechanism (7), the baffle mechanism (7) includes multiple sets of baffles that are alternately and symmetrically installed on both sides of the fluidization chamber (6) at a certain angle, the fluidized material particles in the fluidization chamber (6) flow from the head to the tail along the baffle path formed by the baffle mechanism (7); a set of baffle mechanism (7) is provided on the lower side of the fluidization chamber (6) near the discharge port, the dried material passes through the baffle mechanism (7) Overflow from the upper edge of the baffle (14) enters the discharge pipe (12) and is discharged; wherein, the baffle mechanism (7) includes a baffle groove (15) inclined along the side wall of the fluidizing chamber (6), the baffle groove (15) is slidably connected to the baffle (14) inside the fluidizing chamber (6), the outer end of the baffle (14) is provided with a support rod (16) slidably connected in the baffle groove (15), the outer end of the support rod (16) is fitted with a sleeve (19), and an adjusting screw (17) is fixedly connected to one side of the sleeve (19); a high-temperature resistant sealing strip is provided between the baffle (14) and the baffle groove (15), and the high-temperature resistant sealing strip seals the guide groove of the baffle groove (15); The fluidization chamber (6) has a support frame (18) corresponding to the adjusting screw (17) on the outer side wall. The adjusting screw (17) is fixedly connected to the support frame (18) by a positioning nut (20). Rotating the positioning nut (20) drives the gap between the adjusting screw (17) and the support frame (18) to drive the baffle (14) to slide along the baffle groove (15) for adjustment. The baffle (14) and the air distribution plate (11) form an angle of 45° to 75°. Vibration motor (3) is fixedly connected to the side wall of the air distribution chamber (5).

2. The baffled mixing vibrating fluidized bed drying device according to claim 1, characterized in that, The baffle (14) is a perforated plate, and the pore size and opening ratio of the perforated plate are determined based on the average diameter of the material.

3. The baffled mixing vibrating fluidized bed drying device according to claim 1, characterized in that, The feeding hopper (8) is connected to the discharge port of the star feeder by a flexible connection and the discharge pipe (12) is connected to the inlet end of the star unloader by a flexible connection. The exhaust pipe (10) is sealed to the cyclone separator and dust collector via a flexible hose.

4. The baffled mixing vibrating fluidized bed drying device according to claim 1, characterized in that, The fluidized bed also includes a support base (1), on which four sets of spring feet (2) are provided. The mounting frame (4) includes four sets of connecting feet (21), which are fixedly connected to the spring feet (2).

5. The baffled mixing vibrating fluidized bed drying device according to claim 1, characterized in that, The air distribution chamber (5), air distribution plate (11) and fluidization chamber (6) are fixedly connected by bolt assembly, and the connection surface is sealed with high temperature resistant rubber gasket.

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