Spray drying system for producing agglomerated powder

Abstract

The utility model relates to the technical field of drying equipment, and discloses a spray drying system for producing agglomerated powder, which comprises a drying tower, the drying tower consists of a cylindrical upper part and a conical lower part, and the conical open end is connected with the upper part; a first hot air input end is arranged at the upper end of the drying tower and used for leading hot air outside the drying tower into the drying tower, so that the hot air flows to the lower end of the drying tower from the upper end of the drying tower, a spray gun is arranged in the middle of the drying tower and used for spraying materials into the drying tower, and an outlet of the spray gun faces the first hot air input end. Hot air and materials can meet at the upper part of the drying tower; a second hot air input end is arranged at the lower end of the drying tower and is used for introducing hot air outside the drying tower into the drying tower, so that the hot air flows to the upper end of the drying tower from the lower end of the drying tower, and the hot air meets the materials at the lower part of the drying tower again; the device has the technical effects that materials and hot air are fully mixed, and the agglomeration effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a spray drying system for producing agglomerated powder. Background Art

[0002] Agglomerated powder generally refers to powder in which fine particles are aggregated together to form larger and relatively uniform lumps or granular powders through specific processes and technologies. The processes adopted may include spray drying, fluidized bed agglomeration, mechanical stirring agglomeration, etc. The purpose is to improve the fluidity, bulk density, dispersibility and other properties of the powder to meet the requirements of different industrial fields. For example, it has wide applications in the fields of pharmaceuticals, chemicals, materials science, etc.

[0003] Specifically, the spray drying agglomeration equipment forms tiny droplets by spraying a solution or suspension, and rapidly dries and agglomerates them into powder under the action of hot air; the fluidized bed agglomeration equipment uses gas to make the powder particles in a fluidized state, and promotes particle agglomeration by adding binders and other means.

[0004] In the existing spray drying agglomeration system, the solution in the drying tower is not sufficiently mixed with the hot air, resulting in an unsatisfactory morphology of the agglomerated powder. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a spray drying system for producing agglomerated powder.

[0006] A spray drying system for producing agglomerated powder according to the utility model includes a drying tower, which is composed of a cylindrical upper part and a conical lower part, and the open end of the cone is connected to the upper part;

[0007] Among them, the upper end of the drying tower has a first hot air input end for introducing hot air outside the drying tower into the drying tower, so that the hot air flows from the upper end to the lower end of the drying tower.

[0008] The obvious difference between this system and the prior art is that a spray gun is provided in the middle of the drying tower. The spray gun is used to spray materials into the drying tower, and the outlet of the spray gun faces the first hot air input end, so that the hot air and the materials can meet in the upper part of the drying tower;

[0009] The advantage of such a setting is that the outlet of the spray gun can be such that the materials and the hot air move towards each other and collide with each other to achieve more sufficient mixing; and the liquid materials and the hot air can complete the first drying operation in the upper part of the drying tower, rather than in the entire drying tower, leaving space for subsequent operations.

[0010] What is also significantly different between this system and the prior art is that the lower end of the drying tower is provided with a second hot air input end, which is used to introduce the hot air outside the drying tower into the drying tower, so that the hot air flows from the lower end to the upper end of the drying tower, so that the hot air meets the material again at the lower part of the drying tower;

[0011] The advantage of such a setting is that the particles formed in the first drying operation fall into the lower part of the drying tower under the action of gravity, and the secondary drying operation is carried out in the lower part of the drying tower, so that the particles are fully dried in the drying tower. And because the hot air for the second drying enters the drying tower from bottom to top, it will drive the particles to surge in the drying tower, so that the drying air can be in full contact with the particles, thus obtaining an agglomerated powder with better uniformity.

[0012] What is also significantly different between this system and the prior art is that a gas output end is also provided in the middle of the drying tower. The gas output end is connected to the dust collector, and the powder output end of the dust collector is communicated with the powder return port of the drying tower through a powder return pipe;

[0013] The advantage of such a setting is that the drying waste gas and some entrained fine powder particles are pumped into the dust collector. After the fine powder particles are collected by the dust collector, they enter the drying tower again through the powder return pipe. These fine powder particles are collected and adhered to the particles in the drying tower, thus forming larger secondary particles, which then fall into the lower part of the drying tower under the action of gravity for drying, having the advantage of higher material utilization rate.

[0014] In some examples of the present invention, there are several spray guns, which are arranged along the circumferential direction of the drying tower. The liquid material sprayed by each spray gun is ejected in a conical shape, and the materials sprayed by all the spray guns present an annular structure N. The annular material is sprayed from bottom to top and has a centripetal tendency, so as to form sufficient mixing with the hot air sprayed in a conical shape from top to bottom.

[0015] In some examples of the present invention, a first gas distribution component is further provided at the lower end of the drying tower, so that the hot air input by the second hot air input end is shunted by the first gas distribution component and then enters the drying tower, so that the hot air entering the drying tower for the second time can also be in sufficient contact with the material as much as possible.

[0016] In some examples of the present invention, the system further includes a fluidized bed. An outlet is provided at the lower end of the drying tower, and the outlet is communicated with the fluidized bed. The fluidized bed is used to further evaporate and dry the moisture in the agglomerated powder.

[0017] In some examples of the present invention, one or more hot air drying sections and cold air drying sections are sequentially arranged in the fluidized bed from the input end to the output end. After the agglomerated powder is completely dried in the hot air drying section, it enters the cold air drying section to be cooled and then discharged to obtain the final product.

[0018] In some examples of the present utility model, partitions are provided between the hot air drying sections or between the hot air drying section and the cold air drying section. The partitions are used to prevent the mixing of air masses between different sections and reduce the drying efficiency.

[0019] In some examples of the present utility model, a second gas distribution component is also provided in the fluidized bed. The second gas distribution component extends along the running direction of the materials in the fluidized bed, so that hot air or cold air is shunted by the second gas distribution component and then acts on the materials.

[0020] In some examples of the present utility model, the dust collector includes a cyclone dust collector. The gas output end of the drying tower is connected to the input end of the cyclone dust collector. The cyclone dust collector is used to separate the dust particles and gas in the dried waste gas.

[0021] In some examples of the present utility model, the gas output end of the fluidized bed is also connected to the input end of the cyclone dust collector, in order to collect the waste gas of the fluidized bed and separate the dust by using the cyclone dust collector.

[0022] In some examples of the present utility model, the dust collector further includes a bag filter. The gas output end of the cyclone dust collector is connected to the input end of the bag filter.

[0023] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0025] Figure 1 It is a schematic structural diagram of a spray drying system for producing agglomerated powder in an embodiment of the present utility model;

[0026] Figure 2 It is a schematic diagram of the working state of materials in the drying tower in an embodiment of the present utility model.

[0027] Description of the Reference Numerals in the Drawings:

[0028] Drying tower 1, upper part 11, lower part 12, first hot air input end 13, spray gun 14, second hot air input end 15, gas output end 16 of the drying tower, first gas distribution component 17, discharge port 18, powder return port 19;

[0029] Powder return pipe 2;

[0030] Fluidized bed 3, hot air drying section 31, cold air drying section 32, partition plate 33, second gas distribution component 34, gas output end 35 of the fluidized bed;

[0031] Cyclone dust collector 4, gas output end 41 of the cyclone dust collector, powder output end 42 of the cyclone dust collector;

[0032] Bag dust collector 5, input end 51 of the bag dust collector, powder output end 52 of the bag dust collector. Specific embodiments

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0037] Figure 1 It is a schematic structural diagram of a spray drying system for producing agglomerated powder;

[0038] Figure 2 It is a schematic diagram of the operation state of the material in the drying tower.

[0039] Next, refer to Figures 1-2 Describe according to the embodiments of the present utility model.

[0040] Please refer to the attached Figure 1 , this spray drying system includes a drying tower 1. The drying tower 1 is composed of a cylindrical upper part 11 and a conical lower part 12. The open end of the cone is connected to the upper part 11, and it generally serves as a drying place for the material;

[0041] Specifically, the first drying operation is carried out in the upper part 11, and the second drying operation is carried out in the lower part 12. After the first drying, the material falls into the lower part 12 under the action of gravity. And because the lower part 12 is of a conical structure, it is conducive to the aggregation of the material, thus preparing for the encounter with the hot air in the second drying operation.

[0042] Please continue to refer to the attached Figure 1 , the upper end of the drying tower 1 has a first hot air input end 13. The first hot air input end 13 is used to introduce the hot air outside the drying tower 1 into the drying tower 1, so that the hot air flows from the upper end of the drying tower 1 to the lower end of the drying tower 1. Specifically, the first hot air input end 13 is arranged at the center of the top of the upper part 11.

[0043] Please continue to refer to the attached Figure 1 , a spray gun 14 is provided in the middle of the drying tower 1. The spray gun 14 is used to spray the material into the drying tower 1. The outlet of the spray gun 14 faces the first hot air input end 13, so that the hot air and the material can meet in the upper part 11 of the drying tower 1; Specifically, the spray gun 14 is arranged at the lower end of the upper part 11, that is, at the position connected to the lower part 12.

[0044] Please continue to refer to the attached Figure 1 , in this embodiment, there are two spray guns 14, which are arranged along the circumferential direction of the drying tower 1.

[0045] Please continue to refer to the attached Figure 1, the lower end of the drying tower 1 has a second hot air input end 15, and the second hot air input end 15 is used to introduce the hot air outside the drying tower 1 into the drying tower 1, so that the hot air flows from the lower end of the drying tower 1 to the upper end of the drying tower 1, so that the hot air meets the material again in the lower part 12 of the drying tower 1;

[0046] Specifically, the second hot air input end 15 is arranged at the lower end of the lower part 12, that is, the end far from the upper part 11. After the material enters the drying tower 1 at the second hot air input end 15, it meets the material, and the material surges under the action of the hot air, forming a shape M as shown in Figure 2 so that the material and the hot air are fully mixed.

[0047] Please continue to refer to the appendix Figure 1 , a first gas distribution component 17 is also arranged at the lower end of the drying tower 1, so that the hot air input by the second hot air input end 15 is shunted by the first gas distribution component 17 and then enters the drying tower 1;

[0048] Specifically, the first gas distribution component 17 is installed in the lower part 12, and the position is higher than the second hot air input end 15. The first gas distribution component 17 is specifically a plate member with holes. When the hot air passes through the plate member, it is divided into multiple airflows by the action of the holes and acts on the material.

[0049] Please continue to refer to the appendix Figure 1 , the spray drying system further includes a fluidized bed 3. An outlet 18 is arranged at the lower end of the drying tower 1, and the outlet 18 is communicated with the fluidized bed 3;

[0050] Specifically, in this embodiment, the fluidized bed 3 is a vibrating fluidized bed. In other embodiments, the fluidized bed 3 can also be other forms of fluidized beds. The outlet 18 corresponds exactly to the feed inlet of the fluidized bed 3 (the feed inlet of the fluidized bed 3 is not shown in the figure).

[0051] Please continue to refer to the appendix Figure 1 , one or more hot air drying sections 31 and cold air drying sections 32 are sequentially arranged in the fluidized bed 3 from the input end to the output end;

[0052] Specifically, in this embodiment, there are two hot air drying sections 31 for continuing to dry the material, and the cold air drying section 32 is used to cool the material, and the material is discharged after being cooled.

[0053] Please continue to refer to the appendix Figure 1 , partitions 33 are arranged between the hot air drying sections 31 and between the hot air drying section 31 and the cold air drying section 32.

[0054] Please continue to refer to the appendix Figure 1, a second gas distribution component 34 is also provided in the fluidized bed 3. The second gas distribution component 34 extends along the running direction of the materials in the fluidized bed 3, so that the hot air or cold air is split by the second gas distribution component 34 and then acts on the materials;

[0055] Specifically, the second gas distribution component 34 is supported by a partition plate 33 and is located above the hot air and cold air inlets. The second gas distribution component 34 is specifically a perforated plate member. When the hot air passes through this plate member, it is divided into multiple airflows by the action of the holes and acts on the materials.

[0056] Please continue to refer to the appendix Figure 1 , a gas output end 16 is also provided in the middle of the drying tower 1. The gas output end 16 is connected to a dust collector. The powder output end of the dust collector is communicated with the anti-powder port 19 of the drying tower 1 through an anti-powder pipe 2;

[0057] Specifically, the gas output end 16 is located in the middle of the drying tower 1, that is, near the connection between the upper part 11 and the lower part 12.

[0058] Please continue to refer to the appendix Figure 1 , the dust collector specifically includes a cyclone dust collector 4. The gas output end 16 of the drying tower 1 is connected to the input end of the cyclone dust collector 4; the gas output end 35 of the fluidized bed 3 is also connected to the input end of the cyclone dust collector 4.

[0059] Please continue to refer to the appendix Figure 1 , the dust collector further includes a bag filter 5. The gas output end 41 of the cyclone dust collector 4 is connected to the input end 51 of the bag filter 5.

[0060] Please continue to refer to the appendix Figure 1 , the powder output end of the dust collector includes the powder output end 42 of the cyclone dust collector and the powder output end 52 of the bag filter, and both of them are connected to the anti-powder pipe 2.

[0061] A spray drying system for producing agglomerated powder according to an embodiment of the present invention includes the dryer, fluidized bed, cyclone dust collector, and bag filter in the above embodiments. Its specific structure, working principle, and operation are known to those of ordinary skill in the art and will not be described in detail here.

[0062] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A spray drying system for producing agglomerated powder, characterized in that: The drying tower comprises a cylindrical upper part and a conical lower part, wherein the open end of the conical lower part is connected to the upper part; The upper end of the drying tower is provided with a first hot air input end, and the first hot air input end is used to introduce hot air outside the drying tower into the drying tower, so that the hot air flows from the upper end of the drying tower to the lower end of the drying tower. A spray gun is provided in the middle of the drying tower, and the spray gun is used to spray materials into the drying tower. The outlet of the spray gun faces the first hot air input end, so that the hot air and the materials can meet at the upper part of the drying tower; The lower end of the drying tower is provided with a second hot air input end, and the second hot air input end is used to introduce hot air outside the drying tower into the drying tower, so that the hot air flows from the lower end of the drying tower to the upper end of the drying tower, so that the hot air meets the material again at the lower part of the drying tower; A gas output end is also provided in the middle of the drying tower, and the gas output end is connected to a dust collector, and a powder output end of the dust collector is connected to a powder return port of the drying tower through a powder return pipe.

2. A spray drying system for producing agglomerated powder according to claim 1, characterized in that: There are a plurality of spray guns, which are arranged along the circumference of the drying tower.

3. A spray drying system for producing agglomerated powder according to claim 1, characterized in that: A first gas distribution component is also provided at the lower end of the drying tower, so that the hot air input from the second hot air input end is diverted by the first gas distribution component before entering the drying tower.

4. A spray drying system for producing agglomerated powder according to any one of claims 1 to 3, characterized in that: It also includes a fluidized bed. The lower end of the drying tower is provided with a discharge port, and the discharge port is communicated with the fluidized bed.

5. A spray drying system for producing agglomerated powder according to claim 4, characterized in that: The fluidized bed is sequentially provided with one or more hot air drying sections and cold air drying sections from the input end to the output end.

6. A spray drying system for producing agglomerated powder according to claim 5, characterized in that: A partition is provided between the hot air drying sections or between the hot air drying section and the cold air drying section.

7. A spray drying system for producing agglomerated powder according to claim 5, characterized in that: A second gas distribution component is also provided in the fluidized bed, and the second gas distribution component extends along the running direction of the material in the fluidized bed, so that hot air or cold air is diverted by the second gas distribution component and then acts on the material.

8. A spray drying system for producing agglomerated powder according to claim 4, characterized in that: The dust collector comprises a cyclone dust collector, and the gas output end of the drying tower is connected to the input end of the cyclone dust collector.

9. A spray drying system for producing agglomerated powder according to claim 8, characterized in that: The gas output end of the fluidized bed is also connected to the input end of the cyclone dust collector.

10. A spray drying system for producing agglomerated powder according to claim 8, characterized in that: The dust collector also includes a bag dust collector, and the gas output end of the cyclone dust collector is connected to the input end of the bag dust collector.

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