A pneumatic dryer

Abstract

This utility model discloses an airflow dryer, including a frame, a secondary dryer, and a collection bin. A vacuum feeder is installed inside the frame, and a weighing bin is connected to the bottom of the vacuum feeder via a pipe. A primary dryer is also installed inside the frame. The secondary dryer is located inside the frame, with one end of the primary dryer connected to the secondary dryer via a drying straight pipe, and one end of the secondary dryer connected to a cyclone separator via a pipe. The collection bin is connected to the bottom of the cyclone separator. The equipment is equipped with a vacuum feeder, providing automatic feeding without the need for manual handling and feeding. The secondary dryer allows for secondary drying of materials that have undergone primary drying. For materials with high initial moisture content, primary drying may not be sufficient to meet strict moisture standards, while secondary drying can further remove moisture, satisfying production processes with stringent moisture content requirements. Thus, through two-stage drying, deep drying of materials can be achieved quickly.

Description

Technical Field

[0001] This utility model belongs to the field of drying technology, specifically relating to an airflow dryer. Background Technology

[0002] In the production processes of many industries such as chemical and food, it is often necessary to dry powdery and granular materials to meet the requirements of product quality, storage and transportation. Airflow dryers have become one of the most widely used drying equipment due to their advantages such as high heat transfer coefficient, large heat transfer area and short drying time. By bringing the heating medium and the solid particles to be dried into direct contact, the particles are suspended in the fluid, which greatly increases the contact area between the two phases and enhances the heat and mass transfer process.

[0003] In practical applications, existing airflow dryers often fail to achieve the ideal degree of dryness for materials with high initial moisture content using a single drying process. This makes them unsuitable for some production processes with extremely strict requirements on moisture content. While some existing technologies can achieve a certain degree of drying, when the throughput is large or the finished product requires a low moisture content, the efficiency of a single drying process is low or even insufficient, necessitating secondary drying. However, some traditional drying equipment often requires complex modifications or additional equipment to achieve secondary drying, leading to a significant increase in costs. Utility Model Content

[0004] The purpose of this invention is to provide an airflow dryer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an airflow dryer, comprising:

[0006] The frame contains a vacuum feeder, the bottom of which is connected to a weighing hopper via a pipe. The frame also contains a primary dryer, and the bottom of the weighing hopper is connected to a drum screen via a conveying hopper.

[0007] A secondary dryer is provided, wherein the secondary dryer is located inside the frame and the top end of the primary dryer is connected to the secondary dryer through a drying straight pipe, and the bottom end of the secondary dryer is connected to a cyclone separator through a pipe.

[0008] The material collection bin is connected to the bottom of the cyclone separator. The bottom of the material collection bin is equipped with a straight discharge screen and the bottom of the straight discharge screen is equipped with a finished product bin.

[0009] Preferably, the bottom of the primary dryer is connected to a base and the base is connected to the frame. The drum screen is located on one side of the base and the bottom of the drum screen is provided with a feeding port. The feeding port is provided with a feeder, and one end of the feeding port is connected to the primary dryer through a pipe.

[0010] Preferably, a heat exchanger is connected to one side of the feed port via a pipe, and a blower is connected to one side of the heat exchanger via a pipe, with a primary filter installed on the blower.

[0011] Preferably, a blower is provided at the connection between the collection bin and the direct discharge screen.

[0012] Preferably, a bag filter is connected to the top of the cyclone separator via a pipe, and an induced draft fan is connected to the top of the bag filter via a flexible hose. A silencer is provided at the connection between the induced draft fan and the flexible hose.

[0013] Preferably, the silencer is provided with a chimney on top.

[0014] Preferably, the primary dryer is provided with a cleaning door at the bottom.

[0015] Preferably, an electrical control box is provided on one side of the frame.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The airflow dryer is equipped with a two-stage dryer, which can perform secondary drying on materials that have undergone primary drying. For materials with high initial moisture content, primary drying is difficult to make them meet strict moisture standards, while secondary drying can further remove moisture from the materials to meet the production process with strict requirements on moisture content. Thus, through two-stage drying, the deep drying of materials can be achieved quickly.

[0018] (2) The equipment is equipped with a vacuum feeder, which has an automatic feeding function. The vacuum feeder uses vacuum suction to automatically transport materials from the storage area to the weighing hopper. There is no need for manual handling and feeding, which reduces the manual operation links, reduces labor intensity, and also avoids the contamination that materials may be subjected to during manual handling.

[0019] (3) A straight discharge screen is set at the bottom of the collection bin. After the dried material is separated by the cyclone separator and enters the collection bin, it can be directly screened by the straight discharge screen. The straight discharge screen has a simple structure and is easy to operate. It can quickly screen out qualified finished materials and drop them into the finished material bin below. The feeding process is smoother and more convenient, reducing the residence time of materials in the equipment and improving production efficiency.

[0020] (4) A cleaning door is provided at the bottom of the primary dryer, which makes it convenient to clean the inside of the primary dryer after the equipment has been running for a period of time, remove residual materials, and avoid material residue from affecting the subsequent drying effect and equipment performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1. Vacuum feeder; 2. Weighing hopper; 3. Conveying hopper; 4. Primary dryer; 5. Rotary drum screen; 6. Feeder; 7. Heat exchanger; 8. Blower; 9. Primary filter; 10. Cyclone separator; 11. Collection hopper; 12. Fan; 13. Finished product hopper; 14. Direct discharge screen; 15. Secondary dryer; 16. Bag filter; 17. Exhaust fan; 18. Silencer; 19. Chimney; 20. Electrical control box; 21. Drying straight pipe; 22. Feed port; 23. Cleaning door; 24. Base; 25. Discharge pipe; 26. Hand valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figure 1 An airflow dryer shown includes:

[0025] The frame contains a vacuum feeder 1, the bottom of which is connected to a weighing hopper 2 via a pipe. The frame also contains a primary dryer 4, and the bottom of the weighing hopper 2 is connected to a drum screen 5 via a conveying hopper 3.

[0026] The secondary dryer 15 is located inside the frame and the top end of the primary dryer 4 is connected to the secondary dryer 15 through the drying straight pipe 21. The bottom end of the secondary dryer 15 is connected to the cyclone separator 10 through the pipe.

[0027] The material collection bin 11 is connected to the bottom of the cyclone separator 10. The bottom of the material collection bin 11 is provided with a straight discharge screen 14 and the bottom of the straight discharge screen 14 is provided with a finished product bin 13.

[0028] The bottom of the primary dryer 4 is connected to a base 24 and the base 24 is connected to the frame. The drum screen 5 is located on one side of the base 24 and the bottom of the drum screen 5 is provided with a feeding port 22. A feeder 6 is provided on the feeding port 22. One end of the feeding port 22 is connected to the primary dryer 4 through a pipe.

[0029] A heat exchanger 7 is connected to one side of the feed port 22 via a pipe, and a blower 8 is connected to one side of the heat exchanger 7 via a pipe, and a primary filter 9 is provided on the blower 8.

[0030] A blower 12 is installed at the connection between the collection bin 11 and the direct discharge screen 14. The airflow generated by the blower 12 can form a certain wind force, which pushes the material in the collection bin 11 to the direct discharge screen 14. Especially for some materials with poor flowability, easy to stick or accumulate, the wind force of the blower 12 can help the material overcome the resistance of friction and gravity, and enter the direct discharge screen 14 more smoothly for screening, thereby improving the material conveying efficiency.

[0031] The top of the cyclone separator 10 is connected to a bag filter 16 via a pipe. The top of the bag filter 16 is connected to an induced draft fan 17 via a flexible hose. A silencer 18 is provided at the connection between the induced draft fan 17 and the flexible hose. During operation, the high-speed rotation of the fan impeller and the high-speed flow of air will generate considerable noise. The silencer 18 at the connection between the induced draft fan 17 and the flexible hose can effectively reduce the noise generated by the induced draft fan 17 during operation.

[0032] The silencer 18 is equipped with a chimney 19 at the top. The chimney 19 serves as a channel for exhaust gas discharge, allowing the exhaust gas treated by the silencer 18 to be discharged to the outdoor high altitude. This prevents the exhaust gas from accumulating indoors and ensures indoor air quality and a safe working environment.

[0033] The bottom of the primary dryer 4 is equipped with a cleaning door 23. During the drying process, some material residue, dust or other impurities may accumulate at the bottom of the primary dryer 4. The cleaning door 23 allows the staff to open the door regularly and easily enter the interior of the primary dryer 4 to clean these impurities, preventing them from accumulating too much and affecting the drying effect or damaging the equipment.

[0034] An electrical control box 20 is provided on one side of the frame. The electrical control box 20 is the control center of the electrical system of the entire equipment, which can realize centralized control and management of various parts of the equipment.

[0035] The bottom of the bag filter 16 is connected to a discharge pipe 25, and the bottom of the discharge pipe 25 is equipped with a manual valve 26. The discharge pipe 25 provides a discharge channel for the dust and other materials collected in the bag filter 16, allowing the materials to be discharged smoothly from the discharge pipe 25 at the bottom of the bag filter 16. This prevents excessive accumulation of dust in the bag filter 16, which would affect the dust removal effect. By manually controlling the opening and closing of the manual valve 26, the manual valve 26 can be opened when discharge is needed, allowing the materials to be discharged through the discharge pipe 25; when discharge is not needed, the manual valve 26 can be closed to prevent dust and other materials from leaking at will, thus playing a sealing role and maintaining a stable working environment inside the bag filter 16.

[0036] In this airflow dryer, the material to be dried is first conveyed to the weighing hopper 2 by a vacuum feeder 1. The vacuum feeder 1 uses vacuum suction to lift the material from the storage area and convey it to a higher position, preventing contamination during transport. The material in the weighing hopper 2 is weighed to control the amount of material entering the drying system, ensuring the stability of the drying process and the consistency of product quality. After weighing, the material is conveyed to the drum screen 5 through the conveying hopper 3. The drum screen 5 screens and grades the material from the conveying hopper 3. By rotating, the drum screen 5 uses screens of different apertures to separate the material according to particle size. Larger particles cannot pass through the screen and continue to roll inside the drum until they are discharged for further processing. Materials that meet the particle size requirements pass through the screen and enter the feeding hopper. The material is fed into the primary dryer 4 through the feeder 6 at the feed port 22. Before entering the primary dryer 4, the air passes through the primary filter 9 to remove large particles of impurities, and then is sent into the heat exchanger 7 by the blower 8. In the heat exchanger 7, the air is heated into a hot air stream. The hot air stream enters the primary dryer 4 through the pipe. In the primary dryer 4, the hot air stream comes into full contact with the material, causing the material particles to suspend in it. The hot air stream transfers heat to the material, and the moisture on the surface of the material evaporates rapidly. In this process, the heat and mass transfer efficiency is very high because the contact area between the hot air stream and the material is large, and the high-speed flow of the hot air stream continuously carries away the evaporated moisture, accelerating the drying process. As the drying process proceeds, the moisture content of the material gradually decreases. The dried material and the hot air stream are then transported into the secondary dryer 15 through the drying straight pipe 21.

[0037] After the material and hot air flow from the primary dryer 4 enter the secondary dryer 15, the material comes into full contact with the hot air flow again for further drying. The secondary dryer 15 can control the temperature, humidity and flow rate of the hot air flow according to the characteristics of the material and the final drying requirements to ensure that the material can reach the required degree of dryness. After the secondary drying, the moisture content of the material is further reduced, and the dried material enters the cyclone separator 10.

[0038] In the cyclone separator 10, the dried material particles are separated from the airflow by centrifugal force. The heavier material particles are thrown against the inner wall of the cyclone separator 10 and then fall down the inner wall into the collection bin 11, while the lighter gas is discharged from the top of the cyclone separator 10 and enters the bag filter 16. The bottom of the collection bin 11 is equipped with a straight discharge screen 14. The material is screened by the straight discharge screen 14 to remove any impurities or unqualified particles. The screened finished material falls into the finished product bin 13 for collection. The fan 12 at the connection between the collection bin 11 and the straight discharge screen 14 can assist in the material conveying and screening, so that the material can pass through the straight discharge screen 14 more smoothly into the finished product bin 13.

[0039] The exhaust gas discharged from the top of the cyclone separator 10 contains a small amount of dust. This exhaust gas will enter the bag filter 16, where the dust in the exhaust gas is intercepted by the filter bags, further purifying the exhaust gas. The purified exhaust gas is then drawn by the suction generated by the induced draft fan 17, passes through the silencer 18 to reduce noise, and is finally discharged into the atmosphere through the chimney 19. The silencer 18 effectively reduces the impact of noise generated during equipment operation on the environment.

[0040] The entire airflow dryer is automatically controlled by the electrical control box 20. The electrical control box 20 is equipped with programmable logic controllers (PLCs), frequency converters, relays and other control components. Through connection with various sensors and actuators, it realizes comprehensive monitoring and regulation of the equipment. For example, based on the hot airflow temperature signal fed back by the temperature sensor, the electrical control box 20 automatically adjusts the heating power of the heat exchanger 7 to maintain a stable hot airflow temperature; based on the material weight signal fed back by the weighing sensor, it controls the feeding speed of the feeder 6; based on the pressure difference signal at the inlet and outlet of the bag filter 16, it controls the start and stop of the dust removal device, etc. Through this automated control method, the stable, efficient and safe operation of the airflow dryer is ensured.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An airflow dryer, characterized in that, include: The frame is equipped with a vacuum feeder (1), and the bottom of the vacuum feeder (1) is connected to a weighing hopper (2) through a pipe. The frame is also equipped with a primary dryer (4), and the bottom of the weighing hopper (2) is connected to a drum screen (5) through a conveying hopper (3). Secondary dryer (15), the secondary dryer (15) is located inside the frame and the top end of the primary dryer (4) is connected to the secondary dryer (15) through the drying straight pipe (21), and the bottom end of the secondary dryer (15) is connected to the cyclone separator (10) through the pipe. The material collection bin (11) is connected to the bottom of the cyclone separator (10). The bottom of the material collection bin (11) is provided with a straight discharge screen (14) and the bottom of the straight discharge screen (14) is provided with a finished product bin (13).

2. The airflow dryer according to claim 1, characterized in that: The bottom of the primary dryer (4) is connected to a base (24) and the base (24) is connected to the frame. The drum screen (5) is located on one side of the base (24) and the bottom of the drum screen (5) is provided with a feeding port (22). The feeding port (22) is provided with a feeder (6). One end of the feeding port (22) is connected to the primary dryer (4) through a pipe.

3. The airflow dryer according to claim 2, characterized in that: A heat exchanger (7) is connected to one side of the feed port (22) via a pipe, and a blower (8) is connected to one side of the heat exchanger (7) via a pipe, and a primary filter (9) is provided on the blower (8).

4. The airflow dryer according to claim 1, characterized in that: A blower (12) is provided at the connection between the collection bin (11) and the direct discharge screen (14).

5. The airflow dryer according to claim 1, characterized in that: The top of the cyclone separator (10) is connected to a bag filter (16) via a pipe, and the top of the bag filter (16) is connected to an induced draft fan (17) via a hose. A silencer (18) is provided at the connection between the induced draft fan (17) and the hose.

6. An airflow dryer according to claim 5, characterized in that: The silencer (18) is equipped with a chimney (19) on top.

7. The airflow dryer according to claim 1, characterized in that: The first-stage dryer (4) is equipped with a cleaning door (23) at the bottom.

8. The airflow dryer according to claim 1, characterized in that: An electrical control box (20) is provided on one side of the frame.

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