A fluidized bed drying granulator air distribution plate

Abstract

The present invention discloses a air distribution plate of a fluidized bed drying granulator, which is arranged between a feed bin and a bottom bin, and includes: a side air distribution plate, a plurality of flat air distribution plates and a plurality of V-shaped air distribution plates; the side air distribution plate adopts a hollow frustum structure, and the diameter of its upper edge is larger than the diameter of its bottom edge; a plurality of V-shaped air distribution plates adopt an inverted V-shaped structure, including two flat plates connected at the upper ends, both ends of the flat plates are connected to the inner wall of the side air distribution plate, and the bottom surface of the flat plate is on the same plane as the bottom surface of the side air distribution plate; the bottom ends of a plurality of V-shaped air distribution plates are respectively connected to the side air distribution plate through a plurality of flat air distribution plates. The present invention is applicable to the technical field of fluidized beds. The air distribution plate of the fluidized bed granulation dryer effectively improves the fluidization effect through the combination of the side air distribution plate and the bottom air distribution plate; by reducing the area of the flat air distribution plate, the valve plate area of the discharge valve is reduced, thereby reducing the requirements for the material strength and processing accuracy of the air distribution plate.

Description

Technical Field

[0001] The invention belongs to the technical field of fluidized beds, and specifically relates to a air distribution plate of a fluidized bed dryer granulator. Background Art

[0002] A fluidized bed granulation dryer, also known as a fluidized bed granulator or a one-step granulator, is a device that uses air flow to pass through a granular solid layer to make the solid particles in a suspended motion state, and is used for drying and granulation. It is the core equipment for processes such as drying, granulation, and coating.

[0003] After the fluidized bed operation is completed, the material needs to be discharged from the silo. There are many existing discharging methods, which are mainly divided into two categories. One is open discharging, and the other is closed discharging. Different discharging methods have their own advantages and disadvantages. Open discharging is to move the entire silo out of the fluidized bed and discharge the material by pouring. This method is prone to dust flying and cross-contamination. In closed discharging, there are cyclone discharging, air distribution plate flipping discharging, etc. Among them, air distribution plate flipping discharging is the discharging method with the fastest speed and the least residue. This technical route is to make the entire air distribution plate into a valve plate. When discharging, the air distribution plate is opened like a valve, and the material falls into the bottom silo under the action of gravity and is then discharged from the bottom silo. Because the area of the air distribution plate is large, making the entire air distribution plate into a valve shape requires high requirements for the strength, processing accuracy, and fitting clearance of mechanisms such as the air distribution plate, silo, and rotating shaft. Usually, the air distribution plate is made of a sieve mesh, orifice plate, or sintered plate, and its structural strength is difficult to meet the requirements, and a support needs to be equipped for fixing or reinforcement, while the support will seriously affect the uniform flow effect of the air distribution plate. Especially the edge part of the support has a greater impact. On the other hand, the air distribution plate requires a large flipping space, which has high requirements for the shape and internal space of the silo and bottom silo, and the silo structure needs to be changed, and these changes will have an adverse impact on the performance of the fluidized bed and the overall space layout.

[0004] The fluidization effect is the most important performance index of the fluidized bed. If the fluidization effect is not good, it is easy to cause caking phenomenon, commonly known as "bed collapse". When the fluidized bed is working, the material on the air distribution plate is in a fluidized state. The material in the center moves upward, the material at the edge moves downward along the side wall of the silo, and the material at the bottom moves from the surrounding to the center, forming an internal cycle. When the material has high viscosity or poor fluidity, the edge of the air distribution plate is most likely to form a "jamming" phenomenon, forming local caking. The local caking will block the downward flow of the material along the edge of the silo, and then cause the caking to gradually become larger and spread to the entire silo, which is the main reason for the "bed collapse" phenomenon. The traditional fluidized bed air distribution plate is of a flat plate structure, and the included angle between its edge and the silo wall is 90-110 degrees, forming a "dead zone". The material has less freedom of movement in this area, which is easy to cause local caking and lead to "bed collapse". Summary of the Invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide a fluidized bed drying granulator air distribution plate.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A fluidized bed drying granulator air distribution plate is arranged between a feed bin and a bottom bin, and includes: a side air distribution plate, a plurality of flat air distribution plates and a plurality of V-shaped air distribution plates;

[0008] The side air distribution plate adopts a hollow frustum structure, and the diameter of its upper edge is larger than the diameter of its bottom edge;

[0009] A plurality of the V-shaped air distribution plates adopt an inverted V-shaped structure and include two flat plates connected at the upper ends. Both ends of the flat plates are connected to the inner wall of the side air distribution plate, and the bottom surface of the flat plates is in the same plane as the bottom surface of the side air distribution plate;

[0010] The bottom ends of a plurality of the V-shaped air distribution plates are respectively connected to the side air distribution plate through a plurality of flat air distribution plates.

[0011] Preferably, air vent holes are opened on the side air distribution plate, the V-shaped air distribution plate and the flat air distribution plate, and the hole opening rate is 1.5% - 10%.

[0012] Preferably, a plurality of the V-shaped air distribution plates are arranged in parallel.

[0013] Preferably, there are two V-shaped air distribution plates, and the two V-shaped air distribution plates are perpendicular to each other.

[0014] Preferably, there are more than three V-shaped air distribution plates, at least two V-shaped air distribution plates are parallel to each other, and at least one V-shaped air distribution plate is perpendicular to the parallel V-shaped air distribution plates.

[0015] Preferably, the V-shaped air distribution plate and the side air distribution plate are welded along the intersection line to form an integral structure.

[0016] Preferably, the perpendicular V-shaped air distribution plates are welded along the intersection line to form an integral structure.

[0017] Preferably, a slideway is arranged at the bottom of the air distribution plate, and the flat air distribution plate is slidably connected to the slideway.

[0018] Preferably, a connecting rod is further arranged. The connecting rod passes through the bottom bin and is connected to the flat air distribution plate for driving the flat air distribution plate to slide along the slideway.

[0019] Preferably, a plurality of the flat air distribution plates are respectively rotatably connected to the side air distribution plate or the V-shaped air distribution plate through a rotating shaft.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0021] In the present invention, the side air distribution plate, V-shaped air distribution plate, and horizontal air distribution plate jointly form a complete air distribution plate structure. When the fluidized bed is working, the material performs a fluidization movement on the air distribution plate. After the work is completed, the horizontal air distribution plate is moved horizontally or flipped to form a downward channel, and the material flows downward under the action of gravity, enters the bottom bin, and is then discharged from the bottom bin, thereby realizing the discharging function.

[0022] In the present invention, for the air distribution plate of the fluidized bed granulation dryer, through the combination of the side air distribution plate and the bottom air distribution plate, the fluidization effect is effectively improved; by reducing the area of the horizontal air distribution plate, the valve plate area of the discharge valve is reduced, thereby reducing the requirements for the material strength and processing accuracy of the air distribution plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a schematic diagram of the air distribution plate structure in the present invention Figure 1 ;

[0025] Figure 3 is a schematic diagram of the air distribution plate structure in the present invention Figure 2 ;

[0026] Figure 4 is a schematic diagram of the air distribution plate structure in the present invention Figure 3 ;

[0027] Figure 5 is a schematic diagram of the air distribution plate structure in the present invention Figure 4 ;

[0028] Figure 6 is a schematic diagram of the air distribution plate structure in the present invention Figure 5 ;

[0029] Figure 7 is a schematic diagram of the sliding track connection of the horizontal air distribution plate in the present invention;

[0030] Figure 8 is a schematic diagram of the rotating shaft connection of the horizontal air distribution plate in the present invention.

[0031] Reference numerals: 01, air distribution plate; 011, side air distribution plate; 012, V-shaped air distribution plate; 013, horizontal air distribution plate; 014, sliding track; 015, rotating shaft; 02, material bin; 03, bottom bin. DETAILED DESCRIPTION OF THE INVENTION

[0032] The following is combined with the attached Figures 1-8, to further illustrate the specific implementation of the air distribution plate of a fluidized bed drying granulator of the present invention. The air distribution plate of a fluidized bed drying granulator of the present invention is not limited to the description of the following embodiments.

[0033] Embodiment 1:

[0034] This embodiment provides a specific implementation of the air distribution plate of a fluidized bed drying granulator. As Figures 1-8 shown, it is arranged between the feed bin 02 and the bottom bin 03, and includes: a side air distribution plate 011, a plurality of flat air distribution plates 013 and a plurality of V-shaped air distribution plates 012;

[0035] The side air distribution plate 011 adopts a hollow frustum structure, and the diameter of its upper edge is larger than that of its bottom edge;

[0036] A plurality of the V-shaped air distribution plates 012 adopt an inverted V-shaped structure, including two flat plates connected at the upper ends, and both ends of the flat plates are connected to the inner wall of the side air distribution plate 011, and the bottom surface of the flat plates is on the same plane as the bottom surface of the side air distribution plate 011;

[0037] The bottom ends of a plurality of the V-shaped air distribution plates 012 are respectively connected to the side air distribution plate 011 through a plurality of flat air distribution plates 013.

[0038] Furthermore, ventilation holes are provided on the side air distribution plate 011, the V-shaped air distribution plates 012 and the flat air distribution plates 013, and the hole opening ratio is 1.5% - 10%.

[0039] Furthermore, a plurality of the V-shaped air distribution plates 012 are arranged in parallel.

[0040] Furthermore, the V-shaped air distribution plates 012 and the side air distribution plate 011 are welded along the intersection line to form an integral structure.

[0041] Furthermore, a plurality of the flat air distribution plates 013 are respectively rotatably connected to the side air distribution plate 011 or the V-shaped air distribution plates 012 through a rotating shaft 015.

[0042] Embodiment 2:

[0043] This embodiment provides a specific implementation of the air distribution plate of a fluidized bed drying granulator. As Figures 1-8 shown, other structures are similar to those in Embodiment 1. Furthermore, there are two V-shaped air distribution plates 012, and the two V-shaped air distribution plates 012 are perpendicular to each other.

[0044] Furthermore, the perpendicular V-shaped air distribution plates 012 are welded along the intersection line to form an integral structure.

[0045] Embodiment 3:

[0046] This embodiment provides a specific implementation of the air distribution plate of a fluidized bed drying granulator, as Figures 1-8 shown. The other structures are similar to those in Embodiment 1. Further, there are more than three V-shaped air distribution plates 012, and at least two V-shaped air distribution plates 012 are parallel to each other, and at least one V-shaped air distribution plate 012 is perpendicular to the mutually parallel V-shaped air distribution plates 012.

[0047] Further, the mutually perpendicular V-shaped air distribution plates 012 are welded along the intersection line to form an integral structure.

[0048] Embodiment 4:

[0049] This embodiment provides a specific implementation of the air distribution plate of a fluidized bed drying granulator, as Figures 1-8 shown. The other structures are similar to those in Embodiment 1. Further, a slideway 014 is provided at the bottom of the air distribution plate 01, and the flat air distribution plate 013 is slidably connected to the slideway 014.

[0050] Further, a connecting rod is also provided. The connecting rod passes through the bottom bin 03 and is connected to the flat air distribution plate 013 for driving the flat air distribution plate 013 to slide along the slideway 014.

[0051] Working principle:

[0052] As Figures 1-3 shown, the main functions of the side air distribution plate 011, the V-shaped air distribution plate 012, and the flat air distribution plate 013 are all to ventilate and distribute air, providing a support space for material fluidization. In addition to the above functions, there are the following functions:

[0053] The main functions of the side air distribution plate 011 are as follows:

[0054] 1. The inner surface of the side air distribution plate 011 is a conical inclined surface, and no material will remain during discharging;

[0055] 2. It provides a "ramp" for the material to flow downward to change direction;

[0056] 3. There are openings on the side air distribution plate 011. When the air flow passes through the side air distribution plate 011, its direction points to the central axis of the air distribution plate 01, which can push the material to move towards the center and clear the "obstacles" in time for the upper material to move downward;

[0057] 4. The side air distribution plate 011 increases the area of the entire edge of the air distribution plate 01, improves the edge air volume, and is beneficial to improving the fluidization effect of the material at the edge of the bin 02;

[0058] 5. The side air distribution plate 011 makes the stacking depth at the edge of the bin 02 lower than that in the central area, which is beneficial to reducing the air flow resistance at the edge part.

[0059] The main functions of the V-shaped air distribution plate 012 are as follows:

[0060] 1. The surface of the V-shaped air distribution plate 012 is inclined, and no materials will remain during discharging.

[0061] 2. The V-shaped folded plate shape can improve the structural strength, thus strengthening the entire air distribution plate 01.

[0062] 3. The V-shaped air distribution plate 012 divides the flat air distribution plate 013 into several small pieces, reducing the area of the flat air distribution plate 013 and lowering the requirement for the strength of the valve plate.

[0063] 4. The V-shaped cavity at the bottom can provide space for the fixing, sliding, and rotational movement of the flat air distribution plate 013.

[0064] The function of the flat air distribution plate 013 is for air distribution and discharging. When the flat air distribution plate 013 is in its original position, its shape can fill the gap formed between the side air distribution plate 011 and the V-shaped air distribution plate 012 to form a complete air distribution plate 01. When the flat air distribution plate 013 slides horizontally or flips, a downward channel is formed to provide space for the materials to flow downward.

[0065] As Figure 4 shown, multiple V-shaped air distribution plates 012 are placed horizontally, which can form slender gaps. In this way, the flat air distribution plate 013 can be made into a narrow strip shape, and less displacement space is required when it moves horizontally or flips.

[0066] As Figures 5-6 shown, the V-shaped air distribution plates 012 are perpendicular to each other, which can further improve the structural strength of the air distribution plate 01 and at the same time provide space or channels for mechanisms such as the rotating shaft 015 and connecting rods required for motion control.

[0067] The side air distribution plate 011 and the V-shaped air distribution plate 012, as well as the mutually perpendicular V-shaped air distribution plates 012, are fixedly connected to each other by means such as welding at the intersection line.

[0068] As Figure 7 shown, the horizontal slideway 014 provides limit for the horizontal movement of the flat air distribution plate 013 and is also the support structure of the flat air distribution plate 013. The support and transmission mechanisms of the flat air distribution plate 013 are all located inside the bottom bin 03, where a large amount of material powder flows. As simple mechanisms as possible should be used for support and transmission. When the flat air distribution plate 013 moves translationally, on the one hand, the support structure can be simplified, the matching difficulty can be reduced, and at the same time, the complexity of the connecting rod movement can also be reduced. When the flat air distribution plate 013 moves horizontally, it can move into the lower part of the V-shaped air distribution plate 012 without affecting the downward movement of the materials.

[0069] The connecting rod can be set to be connected to the planar air distribution plate 013, driving the planar air distribution plate 013 to horizontally displace on the slideway. The connecting rod passes through the wall of the bottom bin 03 and leads to the outside, and sealing treatment is required at the perforated part. The connecting rod moves translationally and translates along the axis, reducing the difficulty of sealing.

[0070] As Figure 8 shown, the rotating shaft 015 provides a limit for the flipping of the planar valve plate and is also the support structure of the planar air distribution plate 013.

[0071] In addition, the planar air distribution plate 013 can be controlled to make a flipping motion along the rotating shaft 015 through mechanisms such as a transmission shaft, a cam, and a pull rod.

[0072] The present invention simplifies the structure of bottom discharging, is more convenient for discharging, and at the same time improves the fluidization state and can adapt to viscous materials with poor fluidity.

[0073] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A fluidized bed drying granulator air distribution plate, which is arranged between a feed bin (02) and a bottom bin (03), and is characterized in that, Including: A side air distribution plate (011), several planar air distribution plates (013) and several V-shaped air distribution plates (012); The side air distribution plate (011) adopts a hollow frustum structure, and the diameter of its upper edge is greater than the diameter of its bottom edge; Several of the V-shaped air distribution plates (012) adopt an inverted V-shaped structure, including two flat plates connected at the upper ends, and both ends of the flat plates are connected to the inner wall of the side air distribution plate (011), and the bottom surface of the flat plate is on the same plane as the bottom surface of the side air distribution plate (011); The bottoms of several of the V-shaped air distribution plates (012) are respectively connected to the side air distribution plate (011) through several planar air distribution plates (013).

2. The air distribution plate of a fluidized bed drying granulator according to claim 1, characterized in that: Vent holes are provided on the side air distribution plate (011), the V-shaped air distribution plate (012) and the planar air distribution plate (013), and the opening ratio is 1.5% - 10%.

3. The air distribution plate of a fluidized bed drying granulator according to claim 1, characterized in that: Several of the V-shaped air distribution plates (012) are arranged in parallel.

4. A fluidized bed drying granulator air distribution plate according to claim 1, characterized in that: There are two V-shaped air distribution plates (012), and the two V-shaped air distribution plates (012) are perpendicular to each other.

5. A fluidized bed drying granulator air distribution plate according to claim 1, characterized in that: There are more than three V-shaped air distribution plates (012), at least two of the V-shaped air distribution plates (012) are parallel to each other, and at least one V-shaped air distribution plate (012) is perpendicular to the parallel V-shaped air distribution plates (012).

6. The air distribution plate of a fluidized bed drying granulator according to claim 1, characterized in that: The V-shaped air distribution plate (012) is welded to the side air distribution plate (011) along the intersection line to form an integral structure.

7. A fluidized bed drying granulator air distribution plate according to any one of claims 4 and 5, characterized in that: The perpendicular V-shaped air distribution plates (012) are welded along the intersection line to form an integral structure.

8. The air distribution plate of a fluidized bed drying granulator according to claim 1, characterized in that: A slideway (014) is provided at the bottom of the air distribution plate (01), and the planar air distribution plate (013) is slidably connected to the slideway (014).

9. The air distribution plate of a fluidized bed drying granulator according to claim 8, wherein: A connecting rod is also provided, the connecting rod passes through the bottom bin (03), and the connecting rod is connected to the planar air distribution plate (013) for driving the planar air distribution plate (013) to slide along the slideway (014).

10. A fluidized bed drying granulator air distribution plate according to claim 1, characterized in that: Several of the planar air distribution plates (013) are respectively rotatably connected to the side air distribution plate (011) or the V-shaped air distribution plate (012) through a rotating shaft (015).

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