A staged heating directional circulating spray fluidized bed

Abstract

The application provides a hierarchical heating directional circulation spray fluidized bed, which is composed of multiple groups of sequentially connected spray drying basic units. Each group of the spray drying basic units comprises a wind distribution plate, a nozzle, a first partition plate, a second partition plate and an inclined plate. The first partition plate and the second partition plate are arranged at intervals to form multiple groups of associated high-speed beds and low-speed beds. The nozzle is inserted from the center of the wind distribution plate of the high-speed bed, the nozzle outlet is located above the wind distribution plate, and the inclined plate is located in the low-speed bed. The temperature of the fluidizing air passing through each group of the basic units is sequentially increased. Thus, the particles form a regular and orderly directional circulation from the high-speed bed to the low-speed bed and then to the high-speed bed, and the particles obtain the coating solution in stages during the circulation process, and are dried to form a coating layer. The application has a simple structure and a reasonable design. The directional movement of the particles and the hierarchical heating are realized by the high-low partition plates and the adjustment of the fluidizing air speed and the air temperature, which is beneficial to the controllable drying and uniform flow of the particles and improves the uniformity of the particle coating.

Description

Technical Field

[0001] This invention relates to the field of spray fluidized bed technology, and more particularly to a staged heated directional circulating spray fluidized bed. Background Technology

[0002] Spray fluidized beds possess efficient granulation characteristics and excellent heat and mass transfer performance, enabling efficient particle coating and agglomeration. They have been widely used in food, pharmaceutical, chemical, energy, and environmental fields.

[0003] Existing research has shown that the circulation time distribution plays a crucial role in the uniformity of particle coatings in directional spray fluidized beds. However, the circulation time distribution is influenced by the fluidized bed structure and operating conditions. The particles form a regular and ordered directional flow field, thus effectively controlling the particle circulation time distribution. The particle circulation time distribution has a decisive impact on the uniformity of particle growth. In production, effective drying of the material is necessary; untimely drying leads to poor coating effects. Furthermore, current spray fluidized bed nozzles are relatively concentrated, resulting in concentrated spray liquid with high moisture content, which is detrimental to particle drying, leading to longer drying times, lower production efficiency, and higher energy consumption. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a staged heating directional circulating spray fluidized bed, which enables directional movement and staged heating of particles, facilitating controllable drying and uniform flow of particles, thereby effectively improving the uniformity of particle coating.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A staged heating directional circulating spray fluidized bed, characterized in that: it comprises several sets of spray drying basic units connected in sequence, each set of spray drying basic units includes a high-speed bed and a low-speed bed, the fluidized bed as a whole forms a structure in which the high-speed bed and the low-speed bed are arranged alternately in sequence, the bottom of the high-speed bed and the low-speed bed are respectively provided with a high-speed air distribution plate and a low-speed air distribution plate, a first partition is provided inside the spray drying basic unit to separate the high-speed bed and the low-speed bed, a second partition is provided on the outside of the spray drying basic unit, the bottom of the second partition is provided with circulation holes, nozzles are provided on the high-speed air distribution plate, high-speed fluidizing air is passed from the high-speed air distribution plate into the high-speed bed, and low-speed fluidizing air is passed from the low-speed air distribution plate into the low-speed bed.

[0007] Furthermore, along the direction of particle flow within the fluidized bed, the temperature of the fluidizing air entering through the high-speed air distribution plate and the low-speed air distribution plate increases sequentially.

[0008] Furthermore, the bottom of the low-speed bed is provided with an inclined plate, which gradually slopes downward along the direction from the first partition to the second partition.

[0009] Furthermore, the inclined plate has a mesh structure with small holes.

[0010] Furthermore, the diameter of the orifice is smaller than the diameter of the particles in the fluidized bed.

[0011] Furthermore, the nozzle is located at the center of the high-speed air distribution plate, and the bottoms of the nozzles are connected in series via pipes.

[0012] Furthermore, the spray drying basic unit is provided in n groups, where n≥2.

[0013] Furthermore, the wind speeds of the high-speed fluidizing air and the low-speed fluidizing air introduced from the high-speed air distribution plate and the low-speed air distribution plate can be adjusted independently.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The graded heating directional circulating spray fluidized bed of the present invention has different fluidizing air velocities through the air distribution plates of two adjacent compartments. The air distribution plate below the nozzle receives high-speed fluidizing air, while the air distribution plate below the inclined plate receives low-speed fluidizing air. By adjusting the secondary air velocity, the directional movement of particles can be independently controlled, so as to achieve good circulation of particles in the fluidization device.

[0016] 2. In the graded heating directional circulating spray fluidized bed of the present invention, the temperature of the fluidizing air entering the air distribution plate of each group of spray drying basic units increases sequentially, thereby realizing graded heating of particles, effectively drying them, and improving the uniformity of particle coating.

[0017] 3. The staged heating directional circulating spray fluidized bed of the present invention has a flexible structure that meets industrial needs by using a set of high-speed beds and low-speed beds as basic units, with n sets of units (n≥2).

[0018] 4. The staged heating directional circulating spray fluidized bed of the present invention has nozzles and inclined plates arranged at intervals to avoid concentrated spraying, high moisture content, disperse spray intensity, and effectively dry particles. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the basic unit structure of spray drying according to an embodiment of the present invention;

[0021] Figure 3 a is a top view of a fluidized bed structure with three sets of spray drying basic units;

[0022] Figure 3 b is a top view of a fluidized bed structure with four sets of spray drying basic units;

[0023] Figure 3 c is a top view of a fluidized bed structure with five sets of basic spray drying units;

[0024] Wherein: 1-high speed bed, 2-low speed bed, 3-high speed air distribution plate, 4-low speed air distribution plate, 5-first partition, 6-second partition, 7-circulation hole, 8-nozzle, 9-inclined plate, 10-pipe, 11-high speed fluidizing air, 12-low speed fluidizing air. Detailed Implementation

[0025] To enhance understanding of the present invention, we will now describe it in further detail with reference to the accompanying drawings. These embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention.

[0026] Figure 1-2 A specific embodiment of a staged heated directional circulating spray fluidized bed is shown, such as... Figure 1 As shown, it includes two sets of spray drying basic units connected in sequence. Each set of spray drying basic units includes a high-speed bed 1 and a low-speed bed 2. The fluidized bed as a whole forms a cubic structure in which the high-speed bed 1 and the low-speed bed 2 are arranged alternately.

[0027] like Figure 2 As shown, taking one of the spray drying basic units as an example, a high-speed air distribution plate 3 and a low-speed air distribution plate 4 are respectively provided at the bottom of the high-speed bed 1 and the low-speed bed 2. A first partition 5 is provided inside the spray drying basic unit to separate the high-speed bed 1 and the low-speed bed 2. A second partition 6 is provided on the outside of the spray drying basic unit. A circulation hole 7 is opened at the bottom of the second partition 6. A nozzle 8 is provided on the high-speed air distribution plate 3. High-speed fluidizing air 11 is passed from the high-speed air distribution plate 3 into the high-speed bed 1, and low-speed fluidizing air 12 is passed from the low-speed air distribution plate 4 into the low-speed bed 2.

[0028] The bottom of the low-speed bed 2 is provided with an inclined plate 9, which gradually slopes downward along the direction from the first partition 5 to the second partition 6. The inclined plate 9 has a mesh structure with small holes to facilitate the passage of fluidizing air. The diameter of the small holes is smaller than the diameter of the particles in the fluidized bed to prevent particles from falling into the dead corner at the bottom of the low-speed bed 2.

[0029] Along the direction of particle flow within the fluidized bed, the temperature of the fluidizing air entering through the high-speed and low-speed air distribution plates increases sequentially, achieving graded heating of the particles and effectively drying them.

[0030] Nozzles 8 are positioned at the center of the high-speed air distribution plate 3, and their bottoms are connected in series via pipes 10. This disperses the spray intensity and effectively dries the particles. The high-speed fluidizing air 11 and low-speed fluidizing air 12 introduced from the high-speed air distribution plate 3 and the low-speed air distribution plate 4 can be independently adjusted. By adjusting the secondary air speed, the directional movement of the particles can be independently controlled, achieving good circulation of the particles within the device.

[0031] The working process and principle of the above embodiments are as follows:

[0032] Due to the difference in fluidizing air velocity between the high-speed bed 1 and the low-speed bed 2, the particles move upward in the high-speed bed 1, pass over the first partition 5, enter the low-speed bed 2, and gradually sink. Guided by the inclined plate 9, the sinking particles enter the next spray drying unit, the high-speed bed 1, through the circulation hole 7 at the bottom of the second partition 6 to continue circulating. The nozzle 8 at the bottom of the high-speed bed 1 sprays mist into the high-speed bed 1, which adheres to the surface of the particles. As the particles move forward in the fluidized bed, the gradually heating fluidizing air can achieve staged heating of the particles, effectively drying them. Thus, the particles form a regular and orderly directional circulation from the high-speed bed 1 to the low-speed bed 2 and back to the high-speed bed 1, and obtain coating solution in stages during the circulation process, drying to form a coating coating.

[0033] like Figure 3 As shown, n sets of spray drying basic units can be set up as needed, such as three sets, four sets, five sets, etc., with flexible structure to meet industrial needs.

[0034] The above specific embodiments are only for illustrating the technical concept and structural features of the present invention, and are intended to enable those skilled in the art to implement them. However, the above content does not limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and essence of the present invention should fall within the scope of protection of the present invention.

Claims

1. A staged heating directional circulating spray fluidized bed, characterized in that: The system includes several sets of spray drying basic units connected in sequence. Each set of spray drying basic units includes a high-speed bed (1) and a low-speed bed (2). The fluidized bed as a whole forms a structure in which the high-speed bed (1) and the low-speed bed (2) are arranged alternately. The bottom of the high-speed bed (1) and the low-speed bed (2) are respectively provided with a high-speed air distribution plate (3) and a low-speed air distribution plate (4). The spray drying basic unit is provided with a first partition (5) to separate the high-speed bed (1) and the low-speed bed (2). The outside of the spray drying basic unit is provided with a second partition (6). The bottom of the second partition (6) is provided with a circulation hole (7). The high-speed air distribution plate (3) is provided with a nozzle (8). High-speed fluidizing air (11) is passed from the high-speed air distribution plate (3) into the high-speed bed (1), and low-speed fluidizing air (12) is passed from the low-speed air distribution plate (4) into the low-speed bed (2). Along the direction of particle flow in the fluidized bed, the temperature of the fluidizing air entering through the high-speed air distribution plate (3) and the low-speed air distribution plate (4) increases sequentially; The bottom of the low-speed bed (2) is provided with an inclined plate (9), which gradually slopes downward along the direction from the first partition (5) to the second partition (6); The wind speeds of the high-speed fluidizing air (11) and the low-speed fluidizing air (12) introduced from the high-speed air distribution plate (3) and the low-speed air distribution plate (4) can be adjusted independently. The nozzle (8) at the bottom of the high-speed bed (1) sprays a mist into the high-speed bed (1). The mist adheres to the surface of the particles. As the particles move forward in the fluidized bed, the gradually heated fluidizing air achieves graded heating of the particles and effectively dries them. The particles move from the high-speed bed (1) to the low-speed bed (2) and then to the next high-speed bed (1), forming a regular and orderly directional cycle. During the cycle, the coating solution is obtained in stages, and the drying forms a coating coating.

2. The staged heating directional circulating spray fluidized bed according to claim 1, characterized in that: The inclined plate (9) has a mesh structure with small holes.

3. The staged heating directional circulating spray fluidized bed according to claim 2, characterized in that: The diameter of the orifice is smaller than the diameter of the particles in the fluidized bed.

4. The staged heating directional circulating spray fluidized bed according to claim 1, characterized in that: The nozzle (8) is located at the center of the high-speed air distribution plate (3), and the bottom of the nozzle (8) is connected in series through pipes (10).

5. The staged heating directional circulating spray fluidized bed according to claim 1, characterized in that: The spray drying basic unit is configured in n groups, where n≥2.

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