Improved vibrated fluidized bed dryer

Abstract

The utility model provides an improved vibrated fluidized bed drying machine which comprises an upper shell, a lower shell, supporting legs, a feeding port and a discharging port, and a plurality of pipe connecting ports are formed in the side face of the lower shell. The plurality of pipe connecting openings are connected with a vibration motor and an air inlet pipeline, and the vibration single machine is connected to a distribution plate which is arranged in the lower shell in a suspended manner through a connecting piece; the air inlet pipeline is connected with an exhaust pipe of an air compressor and a heating device, and the air compressor feeds high-temperature and high-pressure air into the lower shell; an air blower is further arranged below the distribution plate in the direction far away from the air inlet pipeline, and the air blower directly faces the distribution plate and provides compensation airflow for the tail end of the distribution plate.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized beds, in particular to an improved vibrating fluidized bed dryer. Background Art

[0002] A fluidized bed, also known as a fluidized bed, is a reactor that uses gas or liquid to pass through a granular solid layer to put the solid particles into a suspended motion state and carry out a gas-solid phase reaction process or a liquid-solid phase reaction process. It has high heat transfer efficiency and facilitates the transportation of large amounts of solid particles. It is often used for mass transfer and heat transfer of plastic particles and as a reactor for plastic synthesis.

[0003] The main structure of a fluidized bed dryer includes a shell, a gas distribution plate, and heat exchange components. The shell is the main part of the fluidized bed and is generally a cylindrical structure. Various process ports are opened at different parts of the shell to meet process requirements, such as the raw gas inlet, the heat carrier inlet, and the gas outlet to the cyclone separator. The gas enters the bed evenly through the small holes on the distribution plate to ensure stable fluidization of the bed. The advantages of a fluidized bed are uniform bed temperature, easy control, and enhanced heat and mass transfer. However, existing fluidized beds also have disadvantages such as uneven heat transfer and poor heat exchange. In addition, the pressure drop of the gas flow in the fluidized bed is large. Especially in large fluidized beds, solid particles are prone to channeling through the bed without good contact with the air during use. This not only reduces the contact efficiency and heat and mass transfer efficiency between the fluid and the solid particles, but may also cause some plastic particles to flow out before they are fully dried, affecting subsequent production and being detrimental to the service life of the equipment. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an improved fluidized bed dryer to solve the problem that the gas flow pressure drop in the prior fluidized bed dryer is large and the channeling phenomenon is easy to occur.

[0005] In order to solve the pressure drop problem of a large-scale improved vibrating fluidized bed dryer, the technical solution provided by the present invention includes:

[0006] An improved vibrating fluidized bed dryer includes an upper shell, a lower shell, support legs, a feed port, and a discharge port. A plurality of pipe connections are provided on the side of the lower shell. The plurality of pipe connections include:

[0007] A vibration motor, wherein the vibration unit is connected to a distribution plate suspended inside the lower housing via a connecting piece;

[0008] An air intake duct, the air intake duct being connected to an exhaust pipe of an air compressor and a heating device, and the air compressor delivering high-temperature and high-pressure air into the dryer;

[0009] A blower is further provided below the distribution plate at a position away from the air inlet duct, and the blower faces the distribution plate to provide a compensating airflow for the end of the distribution plate.

[0010] Furthermore, the distribution plate is provided with oblique gas distribution ports having at least two different cross-sectional areas, with the ports having the two different cross-sectional areas spaced apart from each other. During one-way air intake, the gas distribution ports, angled toward the air intake duct, facilitate air entry through the distribution plate and align with the vibration direction, thereby increasing the movement speed of the plastic particles on the vibrating bed.

[0011] Furthermore, the oblique gas distribution ports have at least two diameters, and the two distribution ports are interlaced. The staggered arrangement of the gas distribution ports allows the plastic particles to be subjected to high-temperature airflow with varying pressures, causing the plastic particles to move in a wave-like manner, providing a more frequent tumbling effect for the plastic particles, and ensuring more uniform heating of the plastic particles.

[0012] Furthermore, an airflow screen is installed under the distribution plate. This screen is a layered structure with dense and fine mesh. The screen can slow down the high-speed air on the feed side and move it towards the discharge port, making the air pressure in the lower shell more uniform.

[0013] To address the impact of channeling, the present invention provides a technical solution that includes multiple diagonal plates installed within the upper housing. These plates are tilted both vertically and horizontally, staggered, and angled with the X, Y, and Z axes. These plates' axes are staggered. These plates prevent the high-temperature airflow from short-circuiting within the upper housing, preventing plastic particles from quickly passing through this "short-circuited" airflow. Instead, they are intercepted by the plates and flow back to the distribution plate, preventing the plastic particles from being completely dried.

[0014] Furthermore, a heater is installed inside the lower housing, preferably a plate heat exchanger, a tubular heat exchanger, or a resistance wire heater connected to a constant temperature water pipe. This heater provides thermal compensation for the dryer and heats the air around it, causing it to rise, moving the air in the lower housing toward the heater. This improves the airflow within the dryer and allows the air in the air intake duct to more easily flow toward the dryer's outlet.

[0015] In order to make the improved vibrating fluidized bed dryer more convenient to use and reduce noise, the technical solution provided by the utility model also includes: the support legs are provided with a suspension system for alleviating the impact of the fluidized bed vibrating on the shell and reducing the impact on the structural parts.

[0016] Furthermore, an elastic edging is provided on the outer periphery of the distribution plate, and the elastic edging is preferably a sponge pad or a rubber pad.

[0017] Furthermore, the upper shell is provided with an observation window.

[0018] The advantages and beneficial effects of the utility model are:

[0019] A blower is added at the end of the vibrating fluidized bed, and a layer of air flow screen is set under the distribution plate to provide air flow compensation for the material accumulated due to the drop in air pressure, alleviating the problem of material retention and poor drying effect at the end of the dryer.

[0020] Oblique gas distribution ports are provided on the distribution plate to speed up the movement of the plastic particles. The gas distribution ports have at least two diameters, and the gas distribution ports of the two diameters are arranged in an interlaced manner, so that the plastic particles can move in a wave-like manner, thereby increasing the tumbling rate of the plastic particles and achieving a better drying effect.

[0021] By arranging inclined plates that are inclined in both vertical and horizontal directions inside the upper shell, the channeling phenomenon of the gas is disturbed, thereby reducing the problem of incomplete drying of the plastic particles due to the channeling phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the distribution plate of the utility model;

[0025] Figure 4 This is a schematic cross-sectional view of the utility model along AA;

[0026] In the picture:

[0027] Upper shell, 2-lower shell, 3-support leg, 4-feed port, 5-discharge port, 6-pipe port, 7-vibration motor, 8-air inlet pipe, 9-blower, 10-distribution plate, 11-gas distribution port, 12-air flow screen, 13-inclined plate, 14-heater, 15-suspension system, 16-elastic edging, 17-observation window, 18-air outlet. DETAILED DESCRIPTION

[0028] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0029] See also Figures 1 to 4 An improved vibrating fluidized bed dryer includes an upper shell 1, a lower shell 2, support legs 3, a feed port 4, and a discharge port 5. A plurality of pipe ports 6 are provided on the side of the lower shell 2. The plurality of pipe ports 6 are connected to: a vibration motor 7 connected to a distribution plate 10 suspended inside the lower shell 2 via a connector, an air intake duct 8 connected to an air compressor exhaust pipe and a heating device, and the air compressor delivers high-temperature and high-pressure air into the dryer; and an air outlet 18 is provided on the upper shell. A blower 9 is also provided below the distribution plate 10 at a position away from the air intake duct 8. The blower 9 faces the distribution plate 10. The distribution plate 10 is provided with oblique gas distribution ports 11. The gas distribution ports 11 have two cross-sectional areas. The two distribution ports 11 with different cross-sectional areas are arranged in an interlaced manner. An air flow screen 12 is provided on the lower layer of the distribution plate 10. The air flow screen 12 is a layered structure with dense and fine meshes, and the mesh size is 1~2mm.

[0030] During air intake, the blower 9 provides a compensating airflow to the end of the distribution plate 10. The gas distribution ports 11, angled toward the air inlet duct 8, facilitate air entry from the distribution plate 10 and align with the vibration direction, increasing the speed of the plastic pellets on the vibrating bed. The staggered arrangement of the gas distribution ports 11 also subjects the plastic pellets to high-temperature airflow with fluctuating pressures (smaller diameter gas distribution ports generally have higher air pressures) during movement, causing them to move in a wave-like manner, providing a more frequent tumbling effect and more even heating. The airflow screen 12 slows the high-speed air on one side of the feed port, causing it to move toward the discharge port 5, thereby achieving more uniform air pressure within the lower housing 2.

[0031] To address the impact of channeling, the present invention provides a technical solution that includes a plurality of diagonal plates 13 fixedly mounted within the upper housing 1. These plates 13 form angles with the X, Y, and Z axes, and their axes are staggered. A heater 14 is also located within the lower housing, preferably a plate heat exchanger or tubular heat exchanger connected to a constant temperature water pipe, or a resistance wire heater connected to a power source.

[0032] The diagonal plates 13 prevent the high-temperature airflow from channeling within the upper housing, preventing the plastic particles from quickly passing through the "short-circuited" airflow path. Instead, they are blocked by the diagonal plates and flow back along the diagonal plates to the distribution plate, thus preventing the plastic particles from rapidly flowing out and causing incomplete drying. Heater 14 provides thermal compensation for the dryer. Furthermore, it heats the air around it, causing it to rise rapidly, forcing the high-pressure air in the lower housing 2 toward heater 14, improving the airflow within the dryer and allowing the air in the air intake duct to flow more easily toward the dryer's discharge port.

[0033] To make the improved vibrating fluidized bed dryer more convenient to use and reduce noise. The technical solution provided by the utility model also includes: the support legs 3 are provided with a suspension system 15, which is used to alleviate the impact of the fluidized bed on the shell when it vibrates and reduce the impact on the structural parts. The outer periphery of the distribution plate is provided with an elastic edging 16, which is preferably a sponge pad or a rubber pad, and is used to prevent the distribution plate 10 from colliding with the lower shell during vibration, reduce noise, and reduce leakage from the gap between the lower shell 2 and the distribution plate 10 during vibration. The upper shell 1 is provided with an observation window 17, which is convenient for observers to check the working conditions inside the dryer at any time during the vibration process.

[0034] The plastic particles to be dried are put into the feed port, and the plastic particles fall onto the distribution plate. The distribution plate vibrates in the direction above the discharge port. At the same time, the air inlet pipe sends hot air with a temperature of 60 to 80 degrees Celsius into the lower shell. While the hot air moves toward the discharge port inside the lower shell, it also flows toward the upper shell through the gas distribution port of the distribution plate. In this process, the wet plastic particles are blown by the high-temperature airflow to present a fluid-like state. In this state, the moisture on the surface of the plastic particles is taken away by the hot air, and the hot and humid gas containing a large amount of moisture is discharged from the outlet. Since the diameter of the gas distribution port on the distribution plate is variable, the plastic particles in the fluid state also move in a wave-like manner, with more flipping effects, thereby obtaining more comprehensive and uniform drying. The dried plastic particles will move toward the discharge port due to the vibration of the distribution plate. The air pressure and temperature in the lower shell will drop significantly from the air inlet pipe to the discharge port due to the passage through the distribution plate in sequence, causing the plastic particles at the discharge port to be retained. The retained plastic particles will be compensated by the air intake provided by the blower and continue to move in a "fluid" state. The plastic particles that are not completely dried will also be compensated by the heat of the heater, thereby ensuring the drying effect of the plastic particles at the discharge port. The airflow passing through the distribution plate will also move toward the discharge port. Depending on the size, shape and intake air pressure of the plastic particles, channeling may sometimes occur. At this time, since an oblique plate is provided inside the upper shell, the airflow inside the upper shell is blocked, thereby reducing the gas flowing to the discharge port and avoiding the problem of channeling that causes some plastic particles to not be fully dried. Since the oblique plate is inclined in both vertical and horizontal directions, the plastic blocked on its surface will move along the oblique plate toward the shell and fall due to its own weight. Since the airflow inside the dryer is smaller as it approaches the shell, the oblique plate cannot block the movement of the plastic particles, and the plastic particles are eventually discharged from the discharge port.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An improved vibrating fluidized bed dryer, comprising an upper shell, a lower shell, support legs, a feed port, and a discharge port, wherein a plurality of pipe connections are provided on the side of the lower shell, wherein the plurality of pipe connections include: A vibration motor, wherein the vibration unit is connected to a distribution plate suspended inside the lower housing via a connecting piece; An air intake duct, the air intake duct being connected to an exhaust pipe of an air compressor and a heating device, and the air compressor delivering high-temperature and high-pressure air into the lower housing; It is characterized by: A blower is further provided below the distribution plate in a direction away from the air inlet duct, and the blower faces the distribution plate to provide a compensating airflow for the end of the distribution plate.

2. The vibrating fluidized bed dryer according to claim 1, characterized in that An oblique gas distribution port is provided through the distribution plate.

3. The vibrating fluidized bed dryer according to claim 2, characterized in that The oblique gas distribution ports have at least two different cross-sectional areas, and the distribution ports of the two cross-sectional areas are spaced apart from each other.

4. The vibrating fluidized bed dryer according to claim 1, characterized in that The lower layer of the distribution plate is fitted with an airflow screen having dense meshes.

5. The vibrating fluidized bed dryer according to claim 1, characterized in that A plurality of oblique plates are arranged inside the upper shell. The oblique plates have angles with the X-axis, the Y-axis and the Z-axis. The axes of the plurality of oblique plates are staggered.

6. The vibrating fluidized bed dryer according to claim 1, characterized in that A heater is also provided inside the lower shell.

7. The vibrating fluidized bed dryer according to claim 1, characterized in that The supporting legs are provided with a suspension system.

8. The vibrating fluidized bed dryer according to claim 1, characterized in that A sponge pad or a rubber pad is fitted on the outer periphery of the distribution plate.

9. The vibrating fluidized bed dryer according to claim 1, characterized in that The upper shell is provided with an observation window.

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