Chemical powder drying equipment

Abstract

The utility model relates to the technical field of chemical equipment, and discloses chemical powder drying equipment, which is characterized in that a hollow rotating shaft, hollow blades and a baffle plate are utilized in a drying box body to realize sectional heating and cooling of materials, and meanwhile, the retention time of the materials in the box body in a heating section and a cooling section can be regulated and controlled through a plurality of speed reducers; the heating contact area with materials is increased through the hollow rotating shaft and the hollow blades, so that the heating and drying efficiency is improved; the vacuum continuous drying is adopted, wet materials only need to be conveyed into the feeding and blanking device of the drying machine, the dried materials are automatically discharged through the discharging and blanking device, operation is easy, the automation degree is high, and compared with traditional intermittent drying, the drying time is shortened, and meanwhile the labor intensity of workers is reduced.

Description

Technical Field

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

[0002] Drying equipment and processes are indispensable in modern production across various industries. Traditional drying equipment mainly includes stirred dryers and box dryers. Stirred dryers generate excessive heat due to material friction during operation, resulting in significant wear and tear. Furthermore, their complex internal structure makes thorough cleaning difficult, leading to material accumulation. Box dryers, on the other hand, have excessively long drying times and low efficiency. Traditional drying processes are mainly divided into direct drying and indirect drying processes. While direct drying processes offer high efficiency, their exhaust gas contains high levels of dust, making treatment difficult. Indirect drying processes, however, suffer from large footprints, low efficiency, and high operating costs.

[0003] Existing vacuum drying equipment and processes can generally meet normal usage requirements. However, in the entire drying process, it is difficult for the material to be under the same vacuum state during feeding, conveying, heating, cooling and discharging, resulting in low material dehydration efficiency and increased overall costs. At the same time, the drying processes of most chemical production enterprises have problems such as large equipment investment, large floor space, low drying and dehydration rate, high energy consumption, and blockage of the material inlet and outlet of the drying equipment, which is difficult to clean thoroughly and the product is prone to agglomeration.

[0004] Therefore, it is particularly important to invent a vacuum continuous and efficient drying device suitable for powder or small granular materials.

[0005] Content of utility model

[0006] The present invention aims to solve at least one of the technical problems existing in the related art. Therefore, the present invention provides a chemical powder drying device.

[0007] A chemical powder drying device includes a feeding device, a drying device, and a discharging device;

[0008] The drying device is connected to the feeding device and the discharging device respectively. The feeding device and the discharging device are equipped with a sealing structure to ensure that the drying device is in a vacuum state when the material enters and exits.

[0009] The drying device is equipped with multiple rotating shafts, each with a hollow structure and hollow blades. The hollow structure of the blades is connected to the hollow structure of the rotating shaft, and the rotating shaft is connected to the inlet and outlet of the medium supply system via pipes.

[0010] Furthermore, the drying device includes a drying chamber with a double-layered side wall, which is connected to the inlet and outlet of a media system via pipes; the media system provides refrigerant and heat medium.

[0011] The temperature and circulation flow rate of the refrigerant and heat source are selected based on the properties, particle size, degree of drying, and discharge temperature of the material to be dried.

[0012] Furthermore, the drying chamber is equipped with multiple sets of rotating shafts with hollow blades. Each set of rotating shafts is arranged vertically, and the rotating material is pushed in the same direction. The pushing directions of the multiple sets of rotating shafts are alternately changed.

[0013] Each set of rotating shafts is supplied with the same refrigerant or heat medium, while different sets of rotating shafts are supplied with refrigerant or heat medium according to process requirements.

[0014] Furthermore, the hollow blades are positioned to extend from one end of the drying chamber on the material inlet side to the other end. A bladeless section is provided between the end of the material propulsion direction and the drying chamber to prevent the material from squeezing and damaging the drying chamber, while also providing space for the material to enter the next set of rotating shafts with hollow blades.

[0015] Furthermore, baffles are provided between each set of rotating shafts to prevent cross-mixing of materials during the conveying process and improve drying efficiency.

[0016] Each set of rotating shafts is connected to a main motor, which provides power to the rotating shaft;

[0017] A speed reducer is also provided between the main motor and the rotating shaft.

[0018] Furthermore, at least one material thermometer is installed at the bottom of the drying chamber, and several intermittent pulse backflushing devices are installed inside the side wall of the chamber to prevent material from sticking to the wall.

[0019] A dehumidification port is provided inside the upper cover of the drying chamber, and a dust collector is provided at the lower end of the dehumidification port. The dust collector has a filtration accuracy of ≤5. It adopts a pulse backflushing method.

[0020] Furthermore, the drying chamber is fixed on the dryer support;

[0021] The drying chamber is provided with a material inlet, which is connected to a feeding device, including a feeder and a peristaltic pump. The feeder is connected to the material inlet via the peristaltic pump.

[0022] The drying chamber is provided with a material outlet, and the material outlet is connected to a discharge device, including a discharge feeder and a discharge peristaltic pump. The discharge peristaltic pump is connected to the drying chamber through the discharge feeder.

[0023] The sealing structure is a double ball valve configured in both the feeder and the discharger.

[0024] Furthermore, chemical powder drying equipment also includes solvent recovery devices, including heat exchangers, condenser tanks, and vacuum pumps;

[0025] The top cover of the drying chamber is equipped with an exhaust port, which is connected to the inlet of the heat exchanger via a hose. The drain port at the bottom of the heat exchanger is connected to the feed port of the condenser storage tank. A vacuum pump is connected to the outlet of the heat exchanger via a hose. The top and bottom of the jacket of the heat exchanger are connected to the inlet and outlet of the cooling circulating water via pipes, respectively, to form a circulating water path.

[0026] Furthermore, the top cover of the drying chamber is provided with multiple sets of observation manholes for observing the state of the material;

[0027] The top cover of the drying chamber is also equipped with a steam thermometer and a pressure gauge to detect the temperature and pressure of the solvent during the drying process;

[0028] A vacuum sampler is installed at the bottom of the drying chamber. The sampler is located at the bottom of the drying chamber corresponding to each set of rotating shafts, which can obtain the state of the dried material on each set of rotating shafts, thereby allowing for a more rational configuration of the drying process.

[0029] Furthermore, a hydraulic opening lever is provided between the side wall and the top cover of the drying chamber, which allows the top cover to be easily opened after the drying process, facilitating the inspection and maintenance of the drying chamber, the rotating shaft, and the hollow blades.

[0030] The above-described one or more technical solutions in the embodiments of this utility model have at least one of the following technical effects:

[0031] (1) This utility model adopts vacuum continuous drying. Wet materials only need to be transported to the feeder of the dryer. The dried materials are automatically discharged through the discharger. The operation is simple and the degree of automation is high. Compared with traditional intermittent drying, it shortens the drying time and reduces the intensity of manual labor.

[0032] (2) The material is heated and cooled in stages by using a hollow rotating shaft, hollow blades and baffles in the drying chamber. At the same time, the residence time of the material in the heating and cooling sections can be adjusted by multiple speed reducers. The heating contact area with the material is increased by using a hollow rotating shaft and hollow blades, which improves the efficiency of heating and drying.

[0033] (3) The equipment operates continuously under high vacuum conditions, with high drying efficiency. It can dry wet powder or small particles with high moisture content to low moisture content in a short time; the product is dried more thoroughly and the solvent recovery rate is high.

[0034] (4) The interior of the drying chamber is smooth and without dead corners, easy to clean, and the material can be fed and discharged smoothly without material accumulation during operation. The material wear is minimal, resulting in high-quality products.

[0035] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of a chemical powder drying equipment.

[0038] Figure 2 This is a cross-sectional schematic diagram of a chemical powder drying equipment.

[0039] Figure 3 This is a diagram showing the material conveying route within a chemical powder drying equipment.

[0040] In the diagram: 1. Feeder; 2. Feed peristaltic pump; 3. Hollow paddle; 4. Discharge feeder; 5. Discharge peristaltic pump; 6. Dust collector; 7. Heat exchanger; 8. Condenser tank; 9. Vacuum pump; 10. Hydraulic cover opening lever; 11. Material thermometer; 12. Steam thermometer; 13. Pressure gauge; 14. Drying chamber; 14-1. Material inlet; 14-2. Material outlet; 15. Dryer support; 16. Hoses; 17. Main motor; 18. Media system; 19. Vacuum sampler. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The following embodiments are used to illustrate this utility model but should not be used to limit its scope.

[0042] like Figure 1 and Figure 2 The diagram shows the specific structure and connection relationships of a chemical powder drying equipment.

[0043] A chemical powder drying device includes a feeding device, a drying device, and a discharging device;

[0044] The material enters the drying device through the feeding device connected to it, and the dried material is discharged from the drying device through the discharging device connected to it. The feeding device and the discharging device are equipped with a sealing structure to ensure that the drying device is in a vacuum state when the material enters and exits.

[0045] The drying device includes a drying chamber 14 with a double-layered side wall, which is connected to the inlet and outlet of a medium system 18 via pipes; the medium system 18 provides refrigerant and heat to the drying chamber 14.

[0046] The drying chamber 14 is equipped with multiple rotating shafts, which are hollow structures. Hollow blades 3 are also installed on the rotating shafts. The hollow structure of the hollow blades 3 is connected to the hollow structure of the rotating shaft. The rotating shaft is connected to the inlet and outlet of the medium supply system 18 through pipes. The medium supply system 18 provides refrigerant and heat to the rotating shaft and the hollow blades 3.

[0047] The temperature and circulation flow rate of the refrigerant and heat source are selected based on the properties, particle size, degree of drying, and discharge temperature of the material to be dried.

[0048] The number and arrangement of the rotating shafts are adapted to the length, width and height of the drying chamber 14.

[0049] The drying chamber 14 is equipped with multiple sets of rotating shafts with hollow paddles 3. Each set of rotating shafts is arranged vertically, and the rotating material is pushed in the same direction. The pushing directions of the multiple sets of rotating shafts are changed alternately.

[0050] like Figure 3 As shown, one embodiment is provided, which has 3 groups of a total of 6 rotating shafts with hollow blades 3, with 2 rotating shafts in each group arranged numerically, and the rotating material is pushed in the same direction; the pushing directions of the three types of rotating shafts are alternately changed.

[0051] Each set of rotating shafts is supplied with the same refrigerant or heat medium, while different sets of rotating shafts can be supplied with either refrigerant or heat medium according to process requirements.

[0052] The hollow blades 3 are positioned to extend from one end of the drying chamber 14 on the material inlet side to the other end. There is a bladeless area between the end of the material in the material propulsion direction and the drying chamber 14 to prevent the material from squeezing and damaging the drying chamber 14, while providing space for the material to enter the next set of rotating shafts with hollow blades 3.

[0053] Baffles are installed between each set of rotating shafts to prevent cross-mixing of materials during the conveying process and improve drying efficiency.

[0054] Each set of rotating shafts is connected to a main motor 17, which provides power to the rotating shafts.

[0055] A speed reducer is also installed between the main motor 17 and the rotating shaft.

[0056] The residence time of materials in the heating and cooling sections of the chamber is controlled by multiple speed reducers.

[0057] The bottom of the drying chamber 14 is equipped with at least one material thermometer 11, and several intermittent pulse backflushing devices are installed inside the four walls of the chamber to prevent the material from sticking to the walls.

[0058] The drying chamber 14 is fixed on the dryer support 15;

[0059] The drying chamber 14 is provided with a material inlet 14-1, and the material inlet 14-1 is connected to a feeding device, including a feeder 1 and a feed peristaltic pump 2. The feeder 1 is connected to the drying chamber 14 through the feed peristaltic pump 2.

[0060] The drying chamber 14 is provided with a material outlet 14-2, and the material outlet 14-2 is connected to a discharge device, including a discharge feeder 4 and a discharge peristaltic pump 5. The discharge peristaltic pump 5 is connected to the drying chamber 14 through the discharge feeder 4.

[0061] The sealing structure consists of double ball valves installed in both the feeder 1 and the discharger 4.

[0062] A dehumidification port is provided inside the top cover of the drying chamber 14, and a dust collector 6 is installed at the lower end of the dehumidification port. The dust collector 6 has a filtration accuracy of ≤5. It adopts a pulse backflushing method.

[0063] A hydraulic cover-opening lever 10 is provided between the side wall of the drying chamber 14 and the top cover, which can easily open the top cover after the drying process, facilitating the inspection and maintenance of the drying chamber 14, the rotating shaft, and the hollow blades 3.

[0064] The chemical powder drying equipment also includes a solvent recovery device, including a heat exchanger 7, a condenser storage tank 8, and a vacuum pump 9;

[0065] The top cover of the drying chamber 14 is provided with an exhaust port, which is connected to the inlet end of the heat exchanger 7 via a hose 16. The drain port at the bottom of the heat exchanger 7 is connected to the feed port of the condenser storage tank 8. The vacuum pump 9 is connected to the outlet end of the heat exchanger 7 via a hose 16. The top and bottom of the jacket of the heat exchanger 7 are connected to the cooling circulating water inlet and outlet via pipes, respectively, to form a circulating water path.

[0066] Multiple sets of observation manholes are provided on the top cover of the drying chamber 14 for observing the material status.

[0067] A steam thermometer 12 and a pressure gauge 13 are also installed on the top cover of the drying chamber 14 to detect the temperature and pressure of the solvent during the drying process.

[0068] A vacuum sampler 19 is installed at the bottom of the drying chamber 14. The sampler is located at the bottom of the drying chamber 14 corresponding to each set of rotating shafts. It can obtain the state of the dried material of each set of rotating shafts, so that the drying process can be configured more rationally.

[0069] The specific drying process:

[0070] During operation, before feeding, start the vacuum pump 9 and observe the vacuum level of the equipment to check for leaks. After confirming that there are no leaks, set the temperature of the medium entering the drying chamber 14, preferably 80-130℃. Then connect the heating medium and cooling medium connected to the jacket of the drying chamber 14. At the same time, connect the cooling medium of the heat exchanger 7 to form a circulating water circuit.

[0071] With the vacuum degree of the drying host ≥0.09Mpa, start the feed peristaltic pump 2 and the discharge peristaltic pump 5, and then start the interlock control system of the feed feeder 1 and the discharge feeder 4 connected to the drying chamber 14 to control the opening and closing interval of the double ball valve. The powder material separated by the centrifuge is discharged into the feed feeder 1 through the conveying pipe.

[0072] Under the influence of gravity and suction, the material is discharged into the drying chamber 14. The main motor 17 outside the drying chamber 14 is started, and the motor frequency is set. At the same time, the interval between the dust removal device and the intermittent pulse backflushing of the inner wall of the drying chamber 14 is also set. The material inside the drying chamber 14 is continuously turned and moved according to the designed conveying line under the stirring and pushing of the hollow blades 3. Almost all the solvent mixed in the material evaporates. The solid dust is intercepted by the dust collector 6, and the non-condensable gas enters the heat exchanger 7. Under the action of the cooling water in the jacket of the heat exchanger 7, it condenses into a liquid phase and is discharged into the condenser storage tank 8.

[0073] The material inside the drying chamber 14 gradually passes through the heating section and the cooling section, and is finally discharged to the packaging conveying pipeline via the discharge feeder 4.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A chemical powder drying apparatus characterized by comprising: It comprises a feeding device, a drying device and a discharging device; The drying device is connected with the feeding device and the discharging device respectively, and the feeding device and the discharging device are provided with sealing structures to ensure that the drying device is in a vacuum state when the materials are fed in and discharged; The drying device is provided with a plurality of rotating shafts in a hollow structure, and the rotating shafts are further provided with hollow paddles; the hollow structure of the hollow paddles is communicated with the hollow structure of the rotating shafts, and the rotating shafts are connected with the inlet and outlet of the medium system through pipelines.

2. The chemical powder drying equipment according to claim 1, wherein The drying device comprises a drying box body, and the side wall is provided with a sandwich layer and is connected with the inlet and outlet of the medium system through pipelines; the medium system provides refrigerant and heat medium; According to the properties, particle size, drying degree and discharging temperature of the drying materials, the temperature and circulation flow of the refrigerant and heat source are selected.

3. The chemical powder drying equipment according to claim 2, wherein The drying box body is provided with a plurality of rotating shafts with hollow paddles, each group of the rotating shafts is vertically arranged, and the rotating materials are pushed in the same direction; the pushing directions of the rotating shafts are alternately changed; Each group of the rotating shafts is connected with the same refrigerant or heat medium, and different groups of the rotating shafts are connected with refrigerant or heat medium according to the process requirements.

4. The chemical powder drying equipment according to claim 2, wherein The hollow paddles are arranged from one end of the drying box body to the other end, and a section without paddles is arranged between the end of the material pushing direction and the drying box body to prevent the material from pressing and damaging the drying box body, and to provide space for the material to enter the next group of rotating shafts with hollow paddles.

5. The chemical powder drying equipment according to claim 3, wherein A baffle is arranged between each group of the rotating shafts to prevent the materials from mixing during the conveying process and improve the drying efficiency; Each group of the rotating shafts is connected with a main motor, and the main motor provides power for the rotating shafts; A speed reducer is further arranged between the main motor and the rotating shafts.

6. The chemical powder drying equipment according to claim 2, wherein At least one material temperature gauge is arranged at the bottom of the drying box body, and a plurality of intermittent pulse backflushing devices are arranged in the side wall of the box body to prevent the materials from sticking to the wall. The upper cover of the drying box is internally provided with a dehumidification port, the lower end of the dehumidification port is provided with a dust remover, and the filtering precision of the dust remover is ≤5 , and the pulse back flushing mode is adopted.

7. The chemical powder drying equipment according to claim 2, wherein The drying box body is fixed on a drying machine support; The drying box body is provided with a material inlet, and the material inlet is connected with a feeding device comprising a feeding feeder and a feeding peristaltic pump; the feeding feeder is connected with the material inlet through the feeding peristaltic pump; The drying box body is provided with a material outlet, and the material outlet is connected with a discharging device comprising a discharging feeder and a discharging peristaltic pump; the discharging peristaltic pump is connected with the drying box body through the discharging feeder; The sealing structure is a double-ball valve arranged on the feeding feeder and the discharging feeder.

8. The chemical powder drying equipment according to claim 2, wherein The chemical powder drying equipment further comprises a solvent recovery device, which comprises a heat exchanger, a condenser storage tank and a vacuum pump. The upper cover of the drying box is provided with an exhaust port, which is connected with the inlet end of the heat exchanger through a hose, the bottom exhaust port of the heat exchanger is connected with the feed inlet of the condenser storage tank, the outlet end of the heat exchanger is connected with a vacuum pump through a hose, and the top and bottom of the interlayer of the heat exchanger are respectively connected with the water inlet and outlet of the cooling circulating water through pipelines, so as to form a circulating water path.

9. The chemical powder drying equipment according to claim 2, characterized in that, A plurality of observation manholes are arranged on the upper cover of the drying box for observing the material state; A steam thermometer and a pressure gauge are further arranged on the upper cover of the drying box for detecting the temperature and pressure of the solvent in the drying process; A vacuum sampler is arranged at the bottom of the drying box corresponding to each rotating shaft, which can obtain the drying material state of each rotating shaft, so that the drying process is more reasonably configured.

10. The chemical powder drying equipment according to claim 2, characterized in that, Hydraulic cover opening pull rods are arranged between the side wall and the upper cover of the drying box, which can conveniently open the upper cover after the drying process, and facilitate the maintenance of the drying box, the rotating shaft and the hollow paddle.

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