Powder particle dewatering and drying device

Abstract

The utility model discloses a kind of powder particle dewatering drying device, including feed system, hot air system, powder spraying drying tower body and gas-solid separation system;Feed system is set to the top of powder spraying drying tower body, for sending the powder particle to be handled into powder spraying drying tower body;Hot air system is connected with powder spraying drying tower body, for providing temperature controllable hot air to powder spraying drying tower body inside;Powder spraying drying tower body is hollow tower structure, its inside is for making powder particle and hot air fully mixed, to remove crystallization water inside powder particle;Gas-solid separation system is connected with the export of powder spraying drying tower body, for separating after drying powder particle and humid hot gas;Material receiving system, with the solid export of gas-solid separation system is connected, for collecting separated after dewatering drying powder particle.This application provides powder particle dewatering drying device by directly introducing powder particle into powder spraying drying tower body, and with high-temperature hot air in tower forms gas-solid two-phase flow, realizes the efficient removal of crystallization water in existing solid powder particle.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a powder particle dehydration and drying device. Background Technology

[0002] In many industrial sectors, such as chemicals, pharmaceuticals, food, ceramics, and battery materials, the final performance of powder materials is strictly dependent on their moisture content. Moisture not only adheres to the particle surface as free water but can also exist within the material's crystal lattice as water of crystallization. Traditional drying methods, such as oven drying and fluidized bed drying, are often inefficient in heat transfer, resulting in long drying times and high energy consumption. They can also easily lead to uneven heating of particles, with the outer layer becoming over-dry while the internal moisture is not completely removed, or sintering and agglomeration. Furthermore, removing water of crystallization requires even higher energy and more precise temperature control, which traditional methods struggle to achieve effectively without decomposing the material. In addition, most existing powder particle drying operations are batch operations, making automated continuous production difficult. Existing spray drying equipment often only processes solutions or slurries, and its primary purpose is granulation.

[0003] Therefore, there is an urgent need for a powder dehydration and drying device that can continuously and efficiently remove not only free water but also internal crystal water from powder particles. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a powder particle dehydration and drying device that can continuously and efficiently remove free water on the surface of powder particles and crystal water inside.

[0005] To address the aforementioned technical problems, this utility model provides a powder particle dehydration and drying device, comprising: a feeding system, a hot air system, a powder spraying drying tower, and a gas-solid separation system; the feeding system is located at the top of the powder spraying drying tower and is used to feed the powder particles to be processed into the powder spraying drying tower; the hot air system is connected to the powder spraying drying tower and is used to provide temperature-controlled hot air into the powder spraying drying tower; the powder spraying drying tower has a hollow tower structure, the interior of which is used to fully mix the powder particles with the hot air to remove the crystal water inside the powder particles; the gas-solid separation system is connected to the outlet of the powder spraying drying tower and is used to separate the dried powder particles from the humid hot gas; a collection system is connected to the solid outlet of the gas-solid separation system and is used to collect the separated dehydrated and dried powder particles.

[0006] In one feasible implementation, the feeding system includes a crushing component and a vibrating screen component. The discharge port of the crushing component is connected to the feed end of the vibrating screen component. The qualified particle size outlet of the vibrating screen component is connected to the feed port at the top of the powder spraying drying tower. The unqualified particle outlet is returned to the crushing component for reprocessing through a return pipeline.

[0007] In one feasible implementation, the feeding system includes a negative pressure feeding component, one end of which is connected to the discharge end of the vibrating screen component, and the other end is sealed and connected to the top feed port of the powder spraying drying tower. The negative pressure is used to draw in powder particles and continuously transport them into the powder spraying drying tower.

[0008] In one feasible implementation, the hot air system includes an air inlet unit and a heating unit. The air outlet of the air inlet unit is connected to the inlet of the heating unit via a pipe, and the outlet of the heating unit is connected to the hot air inlet of the powder spraying drying tower via a first hot air pipe.

[0009] In one feasible implementation, the air source of the air intake unit is a selectable device, which is equipped with a switching valve and can select compressed air, nitrogen or argon as the carrier gas.

[0010] In one feasible implementation, the heating unit is an electric heater or a gas heater.

[0011] In one feasible implementation, the top of the spray drying tower is provided with an axial feed inlet and a tangential hot air inlet, so that the hot air and powder particles are instantly mixed at the top of the spray drying tower to form a rotating gas-solid two-phase flow.

[0012] In one feasible implementation, the gas-solid separation system is a cyclone separator, whose air inlet is sealed to the outlet of the powder spraying drying tower via a flange, its bottom discharge port is connected to the feed end of the receiving system, and its top exhaust port is connected to the tail gas treatment or hot air recovery system.

[0013] In one feasible implementation, the receiving system includes a cooling unit and a collector. The inlet of the cooling unit is connected to the solid outlet of the gas-solid separation system, and the outlet is connected to the collector for rapidly cooling the dried powder particles.

[0014] In one feasible implementation, the powder particle dehydration and drying device further includes a hot air recovery system, which includes a heat exchanger with its hot-side inlet connected to the gas outlet of the gas-solid separation system and its cold-side inlet connected to the air inlet of the air inlet unit.

[0015] Implementing this utility model has the following beneficial effects: The powder dehydration and drying device provided in this application directly introduces powder particles into a spray drying tower, where they form a gas-solid two-phase flow with high-temperature hot air, achieving efficient removal of crystal water from existing solid powder particles. Unlike traditional spray drying used for granulation of liquid materials, this application is specifically designed for deep dehydration of solid powder particles, avoiding the problems of uneven heating and incomplete dehydration found in oven or fluidized bed drying, and has a wide range of applications.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0018] Figure 1 This is a schematic diagram of the overall structure of a powder particle dehydration and drying device according to an embodiment of this application.

[0019] The reference numerals in the figure: 100-Powder and particle dehydration and drying device; 10-Feeding system; 11-Pulverizing component; 12-Vibrating screen component; 121-Return pipe; 13-Negative pressure feeding component; 20-Hot air system; 21-Air inlet unit; 22-Heating unit; 23-First hot air pipe; 30-Powder spray drying tower; 31-Feed inlet; 32-Hot air inlet; 34-Discharge outlet; 40-Gas-solid separation system; 41-Exhaust outlet; 50-Collection system; 51-Cooling unit; 52-Collector; 60-Hot air recovery system; 61-Heat exchanger; 62-Water recovery component; 63-Second hot air pipe. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Please refer to Figure 1This application provides a powder particle dehydration and drying device 100 for removing excess moisture from powder particle raw materials, especially the water of crystallization inside the compound. The powder particle dehydration and drying device 100 includes a feeding system 10, a hot air system 20, a powder spraying drying tower 30, and a gas-solid separation system 40. The feeding system 10 is located at the top of the spray drying tower 30 and is used to feed the powder particles to be processed into the spray drying tower 30. The hot air system 20 is connected to the spray drying tower 30 and is used to provide temperature-controlled hot air into the spray drying tower 30. The spray drying tower 30 has a hollow tower structure, and its interior is used to fully mix the powder particles with the hot air to remove the crystal water inside the powder particles. The gas-solid separation system 40 is connected to the outlet of the spray drying tower 30 and is used to separate the dried powder particles from the humid and hot gas. The receiving system 50 is connected to the solid outlet of the gas-solid separation system 40 and is used to collect the separated dehydrated and dried powder particles.

[0026] Among them, the powder spraying drying tower can be a hollow tower with a powder spraying dispersion device, which can spray and disperse the input powder.

[0027] The powder particle dehydration and drying device 100 provided in this application introduces powder particles directly into the spray drying tower 30, where they form a gas-solid two-phase flow with high-temperature hot air, achieving efficient removal of crystal water from existing solid powder particles. Unlike traditional spray drying used for granulation of liquid materials, this application is specifically designed for deep dehydration of solid powder particles, avoiding the problems of uneven heating and incomplete dehydration found in oven or fluidized bed drying, and has a wide range of applications.

[0028] In one feasible implementation, the feeding system 10 includes a crushing component 11 and a vibrating screen component 12. The discharge port of the crushing component 11 is connected to the feed end of the vibrating screen component 12. The qualified particle size outlet of the vibrating screen component 12 is connected to the feed inlet 31 at the top of the powder spraying drying tower 30. Unqualified particles are returned to the crushing component 11 for reprocessing through the return pipe 121. In this way, the screening function ensures the uniformity of particle size, thereby guaranteeing the consistency of subsequent drying effects. It ensures that the powder particles entering the drying tower have a uniform particle size, avoiding incomplete dehydration of large particles due to their small specific surface area, or affecting heat transfer efficiency due to the easy agglomeration of fine powder. Particle size uniformity significantly improves dehydration consistency and product quality stability. Furthermore, the vibrating screen component 12 includes a vibrating motor and a replaceable screen, which facilitates equipment maintenance.

[0029] In one feasible implementation, the feeding system 10 includes a negative pressure feeding assembly 13. One end of the negative pressure feeding assembly 13 is connected to the discharge end of the vibrating screen assembly 12, and the other end is sealed and connected to the top feed inlet 31 of the powder spraying drying tower 30. The negative pressure draws in powder particles and continuously conveys them into the powder spraying drying tower 30. Using negative pressure feeding avoids dust generation, oxidation, or moisture absorption of powder particles during conveying, while simultaneously achieving closed-loop continuous feeding, improving system safety and automation. The negative pressure environment also prevents external air from entering the drying system, making it particularly suitable for materials requiring inert atmosphere protection.

[0030] In one feasible implementation, a buffer hopper is also provided between the vibrating screen assembly 12 and the negative pressure feeding assembly 13. The buffer hopper is used to temporarily store qualified particles to be fed. Furthermore, the buffer hopper can also be equipped with a level sensor (such as a tuning fork switch or radar level gauge) for interlocking control of the material coming into the upstream vibrating screen assembly 12. Furthermore, the outlet of the buffer hopper can also be connected to a rotary valve (airlock valve) or a double flap valve to provide an airtight seal and prevent the backflow of positive pressure hot air inside the drying tower.

[0031] In one feasible implementation, the negative pressure feeding assembly 13 may include a pipeline and a vacuum generator. One end of the pipeline is connected to a powder particle source, and the other end is sealed and connected to the feed port 31 at the top of the spray drying tower 30. The vacuum generator is connected to the pipeline and is used to create a negative pressure in the pipeline. The negative pressure is used to draw in the powder particles and continuously transport them into the spray drying tower 30.

[0032] In one feasible implementation, the negative pressure feeding assembly 13 may include a pipeline and a Venturi tube. The Venturi tube is installed horizontally, with its suction side connected to the rotary valve outlet below the buffer hopper via a pipeline; its power side is connected to a high-speed airflow (which may be ambient temperature or preheated gas) from the bypass or independent fan of the hot air system 20; negative pressure is generated at the throat using the Bernoulli effect to draw in and accelerate the powder particles; the Venturi tube outlet is sealed to the feed port 31 at the top center or eccentric position of the powder spraying drying tower 30 via a high-temperature resistant metal hose or rigid pipe, inserted vertically downwards or at an angle.

[0033] In one feasible implementation, the hot air system 20 includes an air inlet unit 21 and a heating unit 22. The air outlet of the air inlet unit 21 is connected to the inlet of the heating unit 22 via a pipe, and the outlet of the heating unit 22 is connected to the hot air inlet 32 ​​of the powder spraying drying tower 30 via a first hot air pipe 23.

[0034] The air inlet unit 21 provides the air source for the drying medium; the heating unit 22 is connected to the air inlet unit 21 and is used to heat the gas. The modular design of the air inlet and heating units facilitates independent control of airflow and temperature, improving system flexibility. The modular structure also facilitates maintenance and upgrades; for example, heaters of different power can be replaced to adapt to the dehydration requirements of different materials.

[0035] In one feasible implementation, the air source of the air inlet unit 21 is a selectable device, equipped with a switching valve, which can select compressed air, nitrogen, or argon as the carrier gas. Compressed air, nitrogen, argon, or other inert gases or protective gases are selected based on the material characteristics to prevent oxidation of the material at high temperatures. The flexible selection of the carrier gas type via the switching valve allows for the use of inert gases (such as N2 or Ar) when needed to prevent oxidation, decomposition, or side reactions of powder particles at high temperatures. This is particularly suitable for oxygen-sensitive materials such as lithium battery materials and organic pharmaceuticals, ensuring the chemical stability of the product.

[0036] In one feasible implementation, the heating unit 22 is an electric heater or a gas heater. The unit employs a precisely adjustable heater (such as an electric heater) whose temperature is continuously adjustable from room temperature to 600°C (or even higher, depending on material requirements) to provide the different amounts of energy required to remove free water (lower temperature) and water of crystallization (higher temperature).

[0037] In one feasible implementation, the top of the spray drying tower 30 is provided with an axial feed inlet 31 and a tangential hot air inlet 32, so that the hot air and powder particles are instantaneously mixed at the top of the spray drying tower 30, forming a rotating gas-solid two-phase flow. The hot air inlet 32 ​​is a tangential inlet, causing the hot air to form a swirling flow within the spray drying tower 30, thereby increasing the contact area between the powder particles and the hot air, and prolonging the residence time of the powder particles within the tower. Alternatively, the spray drying tower 30 has a conical top, a cylindrical body, and a conical bottom. The feed inlet 31 of the spray drying tower 30 is located at the top of the conical top in the axial direction, that is, at the highest point of the conical top. The hot air inlet 32 ​​of the spray drying tower 30 is located at the top of the cylindrical body, or at the connection between the cylindrical body and the conical top. The hot air inlet 32 ​​is tangential to the inner wall of the cylindrical tower. This allows the powder fed through the feed inlet 31 and the hot air introduced through the hot air inlet 32 ​​to mix instantaneously at the top of the powder spraying drying tower 30, forming a gas-solid two-phase flow. Tangential airflow creates a swirling flow, enhancing gas-solid turbulent mixing and improving heat and mass transfer efficiency; axial airflow is suitable for high-density powder particles. Regardless of the method, it ensures that the powder particles are fully exposed in the high-temperature zone, achieving complete removal of crystal water while avoiding uneven drying caused by short-circuit flow. Furthermore, the tangential direction is not limited to horizontal, upward, or downward. Furthermore, the hot air inlet 32 ​​can be tangentially upward. Because the hot air inlet 32 ​​is located on the tower body, some distance from the top, the upward spiral airflow will not affect the feed, and it can also extend the residence time of the powder particles in the tower. The tower design provides sufficient residence time to ensure that the powder particles are fully heated in the high-temperature airflow, completing the heat and mass transfer process.

[0038] Furthermore, the inner wall of the tower can be coated with wear-resistant and high-temperature-resistant materials to extend the service life of the tower.

[0039] In one feasible implementation, the gas-solid separation system 40 is connected to the outlet of the powder drying tower 30 and can be a primary or secondary cyclone separator used to separate the dried powder particles from the humid exhaust gas.

[0040] In one feasible implementation, the gas-solid separation system 40 is a cyclone separator. The air inlet of the cyclone separator is sealed to the outlet of the powder drying tower 30 via a flange, the bottom discharge port of the cyclone separator is connected to the feed end of the receiving system 50, and the top exhaust port 41 is connected to the tail gas treatment or hot air recovery system 60. The cyclone separator has a simple structure and no moving parts, is suitable for high-temperature and high-dust conditions, has high separation efficiency, can effectively trap micron-sized dry powder, prevent product loss, and provide conditions for subsequent tail gas treatment or waste heat recovery.

[0041] In one feasible implementation, the receiving system 50 includes a cooling unit 51 and a collector 52. The inlet of the cooling unit 51 is connected to the solid outlet of the gas-solid separation system 40, and the outlet is connected to the collector 52 for rapid cooling of the dried powder particles. Direct collection of high-temperature dry powder can easily lead to moisture absorption or crystal transformation. Rapid cooling can "freeze" the dehydrated state, preventing moisture regain, agglomeration, or phase change, thus ensuring product storage stability and subsequent processing performance. Further, the cooling unit 51 is a jacketed cooling pipe or a cold air dilution system, and the collector 52 is a hopper connected to a star-shaped discharge valve. The high-temperature powder from the cyclone separator is rapidly cooled here to prevent moisture absorption and thermal degradation, and finally enters the collector 52 for packaging or collection.

[0042] In one feasible implementation, a hot air recovery system 60 is also included. The hot air recovery system 60 includes a heat exchanger 61, whose hot-side inlet is connected to the top exhaust port 41 of the gas-solid separation system 40 to receive humid hot air, and whose hot air outlet is connected to the air inlet of the air inlet unit 21 via a second hot air duct 63 to deliver dry hot air. This is used to transfer the waste heat of the discharged humid hot gas to fresh air, achieving energy recovery. Further, the hot air recovery system 60 also includes a water recovery component for recovering condensate generated by the heat exchanger 61. The heat exchanger 61 can be a condensation device.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A powder particle dehydration and drying device, characterized in that, include: Feeding system, hot air system, powder drying tower body and gas-solid separation system; The feeding system is located at the top of the powder spraying drying tower and is used to feed the powder particles to be processed into the powder spraying drying tower. The hot air system is connected to the powder spraying and drying tower body and is used to provide temperature-controlled hot air into the powder spraying and drying tower body. The powder drying tower has a hollow tower structure, and its interior is used to fully mix the powder particles with the hot air in order to remove the crystal water inside the powder particles. The gas-solid separation system is connected to the outlet of the powder drying tower and is used to separate the dried powder particles from the hot and humid gas. The material collection system is connected to the solid outlet of the gas-solid separation system and is used to collect the separated, dehydrated and dried powder particles.

2. The powder particle dehydration and drying device according to claim 1, characterized in that, The feeding system includes a crushing component and a vibrating screen component. The discharge port of the crushing component is connected to the feed end of the vibrating screen component. The qualified particle size outlet of the vibrating screen component is connected to the feed port at the top of the powder spraying drying tower. Unqualified particles are returned to the crushing component for reprocessing through a return pipeline.

3. The powder particle dehydration and drying device according to claim 2, characterized in that, The feeding system includes a negative pressure feeding component. One end of the negative pressure feeding component is connected to the discharge end of the vibrating screen component, and the other end is sealed and connected to the top feed port of the powder spraying drying tower. The negative pressure is used to draw in powder particles and continuously transport them into the powder spraying drying tower.

4. The powder particle dehydration and drying device according to claim 1, characterized in that, The hot air system includes an air inlet unit and a heating unit. The air outlet of the air inlet unit is connected to the inlet of the heating unit through a pipe, and the outlet of the heating unit is connected to the hot air inlet of the powder spraying drying tower through a first hot air pipe.

5. The powder particle dehydration and drying device according to claim 4, characterized in that, The air source of the air intake unit is a selectable device, which is equipped with a switching valve and can select compressed air, nitrogen or argon as the carrier gas.

6. The powder particle dehydration and drying apparatus according to claim 4, characterized in that, The heating unit is an electric heater or a gas heater.

7. The powder particle dehydration and drying device according to claim 1, characterized in that, The top of the spray drying tower is provided with an axial feed inlet and a tangential hot air inlet, so that the hot air and powder particles are instantly mixed at the top of the spray drying tower to form a rotating gas-solid two-phase flow.

8. The powder particle dehydration and drying device according to claim 1, characterized in that, The gas-solid separation system is a cyclone separator. The air inlet of the cyclone separator is sealed to the discharge port of the powder drying tower, and the discharge port of the cyclone separator is connected to the feed end of the receiving system.

9. The powder particle dehydration and drying apparatus according to claim 1, characterized in that, The material collection system includes a cooling unit and a collector. The inlet of the cooling unit is connected to the solid outlet of the gas-solid separation system, and the outlet is connected to the collector for rapid cooling of the dried powder particles.

10. The powder particle dehydration and drying apparatus according to claim 8, characterized in that, It also includes a hot air recovery system, which includes a heat exchanger with its hot-side inlet connected to the gas outlet of the cyclone separator and its cold-side inlet connected to the air inlet of the air inlet unit.

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