A filter device for a flight dryer

Abstract

This application relates to a filtration device for a scraper dryer, belonging to the technical field of scraper dryers. It includes a support frame and a filtration assembly, which comprises a filter cylinder, a low-temperature evaporation mother liquor discharge pipe, and an exhaust pipe. The filter cylinder contains a filter chamber filled with Pall rings, and activated carbon mesh is placed on the Pall rings. The filter cylinder is connected to the scraper dryer via a connecting pipe, which uses a combination of vertical and inclined pipes to extend the exhaust gas path. The device is equipped with an infrared beam detector for monitoring bubbles. When bubbles are detected, the controller controls the low-temperature evaporation mother liquor discharge pipe to spray mother liquor to eliminate the bubbles and simultaneously controls the exhaust pump to operate. This application effectively prevents viscous materials from clogging the filtration assembly, improving the continuous operation stability and filtration efficiency of the scraper dryer.

Description

Technical Field

[0001] This application relates to the technical field of scraper dryers, and in particular to a filtration device for scraper dryers. Background Technology

[0002] Scraper dryers are commonly used drying equipment in the chemical, food, and pharmaceutical industries. They achieve efficient drying by using internal rotating scrapers to agitate materials and promote heat transfer. During operation, the equipment is typically equipped with a gas filter. The filter housing is filled with a filter bed made of adsorbent materials such as activated carbon to treat the gas discharged from the dryer, removing dust, moisture, or harmful components to ensure emissions meet environmental standards.

[0003] However, when drying materials that are prone to bubble formation and have a certain degree of viscosity after drying, a large number of bubbles will continuously be generated and released on the heating surface during prolonged continuous drying. As these bubbles rise and burst, they carry trace amounts of viscous liquid or pasty material particles into the filter. The entrained viscous material gradually adheres to and accumulates inside the micropores of the activated carbon and on the surface of the filter media. Over time, this causes blockage of the filter pores, significantly increasing flow resistance, raising pressure drop, and noticeably reducing adsorption efficiency. These problems lead to frequent filter maintenance or replacement, increasing operating costs, interrupting the continuous drying process, and affecting overall production efficiency. Utility Model Content

[0004] To address the problem of filter clogging and frequent maintenance required in scraper dryers when drying viscous materials, air bubbles can trap the viscous material. This application provides a filtration device for scraper dryers.

[0005] The filtration device for a scraper dryer provided in this application adopts the following technical solution: A filtration device for a scraper dryer includes a support frame and a filtration assembly. The filtration assembly includes a filter cylinder, a low-temperature evaporation mother liquor discharge pipe, and an exhaust pipe. Both the filter cylinder and the scraper dryer are mounted on the support frame. The filter cylinder is located above the scraper dryer, and its lower end is connected to the scraper dryer via a connecting pipe. The filter cylinder contains a filtration chamber with a Pall ring stack inside, and each Pall ring has an activated carbon mesh. The exhaust pipe is located at the upper end of the filter cylinder. The low-temperature evaporation mother liquor discharge pipe extends from the outer wall of the filter cylinder into the interior, and is located between the filtration chamber and the connecting pipe. The discharge port of the low-temperature evaporation mother liquor discharge pipe faces the port of the connecting pipe.

[0006] By adopting the above technical solution, this solution extends the path of exhaust gas from the scraper dryer to the filter cartridge through the arrangement of the filter cartridge above the scraper dryer and the connection of the connecting pipe, reducing the possibility of viscous materials entering the filtration chamber with the air bubbles. The Pall ring stack inside the filter cartridge is equipped with an activated carbon mesh, which increases the gas-solid contact area and improves the adsorption efficiency of harmful components in the exhaust gas. At the same time, the design of the low-temperature evaporation mother liquor discharge pipe facing the connection pipe port allows for targeted spraying of mother liquor to eliminate air bubbles, thereby reducing the risk of filter component clogging.

[0007] Preferably, the outlet of the low-temperature evaporation mother liquor discharge pipe is provided with a cap, the cap is rotatably mounted on the discharge pipe, and the cap is also connected to the discharge pipe by a tension spring.

[0008] By adopting the above technical solution, the cap and tension spring installed at the discharge port of the low-temperature evaporation mother liquor discharge pipe remain closed when there is no mother liquor discharge, preventing the waste gas in the filter cartridge from flowing back into the discharge pipe and avoiding pipeline pollution; when the mother liquor is discharged, the mother liquor pressure pushes open the cap to ensure that the mother liquor is sprayed out smoothly.

[0009] Preferably, one end of the tension spring is disposed on the low-temperature evaporation mother liquor discharge pipe, and the other end of the tension spring is disposed near the rotatable connection between the cap and the low-temperature evaporation mother liquor discharge pipe; a guide block is also provided at the discharge port of the low-temperature evaporation mother liquor discharge pipe, and the guide block is used to guide the low-temperature evaporation mother liquor away from the rotatable connection between the cap and the low-temperature evaporation mother liquor discharge pipe.

[0010] By adopting the above technical solution, the tension spring is connected near the rotating connection of the cap, which reduces the torque required for the mother liquor to open the cap, making the cap easier to open; the guide block guides the mother liquor to flow away from the rotating connection, further reducing the resistance when the cap is opened, and ensuring the timeliness and effectiveness of the mother liquor spray.

[0011] Preferably, the filter cartridge is further provided with an infrared beam detector, which includes a transmitter and a receiver. The ends of the transmitter and the receiver extend from the outer wall of the filter cartridge into the interior, and the transmitter and receiver are arranged opposite to each other.

[0012] By adopting the above technical solution, this scheme uses an infrared beam detector with its transmitter and receiver positioned opposite each other inside the filter cartridge to form a non-contact detection barrier above the outlet of the connecting pipe, enabling real-time monitoring of bubble clusters. When a bubble blocks the infrared beam, the detector can promptly generate a trigger signal, providing accurate information for subsequent intervention by the controller, thus achieving early warning of bubbles approaching the filter chamber.

[0013] Preferably, the filter assembly further includes an exhaust pump, which is mounted on an exhaust pipe; the support frame is also equipped with a controller, and both the exhaust pump and the infrared beam detector are communicatively connected to the controller.

[0014] By adopting the above technical solution, the controller is connected to the infrared beam detector and the exhaust pump. When the detector detects bubbles, the controller synchronously controls the low-temperature evaporation mother liquor discharge pipe to spray mother liquor and the exhaust pump to accelerate operation, so as to eliminate bubbles and maintain the system pressure stability and prevent sticky materials from clogging the filter media.

[0015] Preferably, the filter cartridge has an inspection door on its outer wall, and the inspection door is located on one side of the filter chamber.

[0016] By adopting the above technical solution, the inspection door on the outer wall of the filter cartridge facilitates the maintenance of the filter chamber, such as cleaning or replacing the Pall ring stack, thereby improving the maintainability of the device.

[0017] Preferably, the inspection door is provided with a pressing block on the side near the filter cylinder, and an inspection window is provided on the outer wall of the filter cylinder. The edge of the inspection window is provided with a pressing mating surface that cooperates with the pressing block. A locking buckle is provided between the inspection door and the outer wall of the filter cylinder, and the locking buckle is used to press the inspection door tightly against the outer wall of the filter cylinder.

[0018] By adopting the above technical solution, the clamping block on the inspection door is combined with the clamping mating surface of the filter cylinder window edge, and is clamped by the locking buckle to ensure the sealing of the inspection door when it is closed and prevent exhaust gas leakage.

[0019] Preferably, the connecting pipe includes a vertical pipe and an inclined pipe, the vertical pipe is connected to the inclined pipe, and the vertical pipe and the inclined pipe are disposed between the scraper dryer and the filter cylinder.

[0020] By adopting the above technical solution, the connecting pipe is composed of a combination of vertical and inclined pipes. The non-linear path extends the exhaust gas travel, increases the chances of bubble breakage and material settling, and reduces the load on the filter components.

[0021] In summary, this application includes the following beneficial technical effects: 1. The filter cartridge is connected to the scraper dryer via connecting pipes, which include vertical and inclined pipes, extending the exhaust gas path to promote bubble breakage and material settling. The Pall ring stack inside the filter cartridge contains an activated carbon mesh to enhance adsorption capacity. An infrared beam detector monitors bubbles in real time, and the controller coordinates the injection of mother liquor from the low-temperature evaporation mother liquor discharge pipe to eliminate bubbles and controls the exhaust pump to regulate pressure. These components work together to effectively reduce the entry of viscous materials into the filter chamber, lower the risk of filter clogging, extend maintenance intervals, and improve the continuous operation stability and filtration efficiency of the scraper dryer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the overall structure in the embodiments of this application.

[0023] Figure 2 This is a schematic diagram illustrating the structure of the filtering component in the embodiments of this application.

[0024] Figure 3 This is a cross-sectional schematic diagram used to illustrate the filtering component in the embodiments of this application.

[0025] Figure 4 This is a cross-sectional schematic diagram illustrating the low-temperature evaporation mother liquor discharge pipe in the embodiments of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Scraper dryer; 3. Filter assembly; 31. Filter cylinder; 311. Filter chamber; 3111. First support plate; 3112. Second support plate; 312. Pall ring stack; 313. Inspection window; 32. Inspection door; 321. Clamping block; 33. Locking buckle; 34. Exhaust pipe; 35. Exhaust pump; 36. Low-temperature evaporation mother liquor discharge pipe; 361. Guide block; 362. Cover; 363. Tension spring; 37. Infrared beam detector; 371. Transmitter; 372. Receiver; 4. Connecting pipe; 41. Vertical pipe; 42. Inclined pipe; 5. Controller. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0028] This application discloses a filter device for a scraper dryer, referring to... Figures 1-3 The system includes a support frame 1 and a filter assembly 3. Both the scraper dryer 2 and the filter assembly 3 are mounted on the support frame 1, with the filter assembly 3 located above the scraper dryer 2. The lower end of the filter cylinder 31 is fixedly connected to the scraper dryer 2 via a connecting pipe 4. The scraper dryer 2 transmits its internal exhaust gas to the filter assembly 3 through the connecting pipe 4, and the filter assembly 3 is used to purify the exhaust gas.

[0029] Reference Figures 1-3The filter assembly 3 includes a filter cartridge 31, an exhaust pipe 34, and an exhaust pump 35. The filter cartridge 31 is vertically fixed to the support frame 1. The connecting pipe 4 includes a vertical pipe 41 and an inclined pipe 42. The vertical pipe 41 is vertically fixed to the scraper dryer 2 and communicates with the inner cavity of the scraper dryer 2. The lower end of the inclined pipe 42 is fixedly connected to the upper end of the vertical pipe 41, and the upper end of the inclined pipe 42 is also fixedly connected to the lower end of the filter cartridge 31. The inclined pipe 42 communicates with the filter cartridge 31. The purpose of this design is that the vertically arranged vertical pipe 41 can increase the rising distance and residence time of bubbles in the exhaust gas, and utilize the physical property of bubbles naturally rising in liquids to promote the initial separation or breakup of bubbles. Meanwhile, the combination of vertical pipe 41 and inclined pipe 42 forms a non-linear path, which further extends the travel distance of the exhaust gas from the scraper dryer 2 to the filter cartridge 31, providing more opportunities for the liquid droplets or particulate matter entrained in the exhaust gas to settle, thereby reducing the load on the subsequent filter components 3 and improving the overall purification efficiency.

[0030] Reference Figures 2-3 The filter cartridge 31 contains two filter chambers 311, which are arranged along the axial direction of the filter cartridge 31. This embodiment uses one of the filter chambers 311 as an example. The filter chamber 311 is formed by a first support plate 3111, a second support plate 3112, and the inner wall of the filter cartridge 31. The first support plate 3111 and the second support plate 3112 are fixedly arranged along the axial direction of the filter chamber 311. Both the first support plate 3111 and the second support plate 3112 have ventilation holes, and the first support plate 3111 is located below the second support plate 3112. The filter chamber 311 contains a Pall ring stack 312 composed of several Pall rings. In this embodiment, each Pall ring is fixedly connected to an activated carbon mesh.

[0031] Reference Figures 2-3 Two inspection doors 32 are installed on the outer wall of the filter cartridge 31. Each inspection door 32 is located on one side of a filter chamber 311. This embodiment uses one inspection door 32 as an example for explanation. The inspection door 32 is rotatably connected to the outer circumferential side wall of the filter cartridge 31. An inspection window 313 is provided on the filter cartridge 31 near the inspection door 32. A clamping block 321 is fixedly connected to the side of the inspection door 32 near the outer wall of the filter cartridge 31. The window edge of the inspection window 313 is provided with a clamping mating surface that cooperates with the clamping block 321. A locking buckle 33 is fixedly connected between the inspection door 32 and the outer wall of the filter cartridge 31. The locking buckle 33 is used to press the inspection door 32 tightly onto the outer wall of the filter cartridge 31.

[0032] Reference Figure 1 The exhaust pipe 34 is vertically fixed to the upper end of the filter cylinder 31, and the exhaust pipe 34 is connected to the filter cylinder 31. The exhaust pump 35 is fixedly connected to the exhaust pipe 34.

[0033] Reference Figures 1-3 After the exhaust gas reaches the filter cartridge 31, it passes through two filter chambers 311 in sequence. Each filter chamber 311 is filled with Pall rings, and an activated carbon mesh is fixed to the surface of the Pall rings. When the exhaust gas passes through the Pall ring stack 312, the activated carbon mesh adsorbs harmful components, and the high specific surface area of ​​the Pall rings promotes gas-solid contact, further capturing fine particles. The purified gas is discharged through the exhaust pipe 34 by the exhaust pump 35. When the filter assembly 3 requires maintenance, the filter media can be cleaned or replaced through the inspection door 32.

[0034] Reference Figures 2-3 The filter assembly 3 also includes a low-temperature evaporation mother liquor discharge pipe 36, which extends from the side wall of the filter cylinder 31 into the interior. The low-temperature evaporation mother liquor discharge pipe 36 is located between the lower filter chamber 311 and the inclined pipe 42, and the discharge port of the low-temperature evaporation mother liquor discharge pipe 36 faces the upper port of the connecting pipe 4. An infrared beam detector 37 is fixedly connected to the filter cylinder 31. The infrared beam detector 37 includes a transmitter 371 and a receiver 372. The ends of the transmitter 371 and the receiver 372 both extend from the outer wall of the filter cylinder 31 into the interior, and the transmitter 371 and the receiver 372 are arranged opposite to each other. A controller 5 is also fixedly connected to the support frame 1. The controller 5 is located on one side of the filter cylinder 31, and the infrared beam detector 37 and the exhaust pump 35 are both communicatively connected to the controller 5.

[0035] Reference Figures 2-3 The infrared beam detector 37 has its transmitter 371 and receiver 372 mounted on the side wall of the filter cartridge 31, forming a detection barrier above the outlet of the connecting pipe 4. Its function is to monitor in real time whether a cluster of bubbles is approaching the filter chamber 311. The outlet of the low-temperature evaporation mother liquor discharge pipe 36 faces the connecting pipe 4. When the infrared beam detector 37 detects bubbles blocking the light path, it sends a trigger signal to the controller 5. Upon receiving this signal, the controller 5 immediately sends a command to the low-temperature evaporation mother liquor discharge pipe 36, controlling it to spray mother liquor into the cartridge, using the impact and cooling effect of the liquid to "break" or suppress the bubbles. Simultaneously, the controller 5 controls the exhaust pump 35 to accelerate its operation, ensuring smooth exhaust and stable pressure. This mechanism effectively prevents viscous materials from arriving with the bubbles and clogging the filter media, improving the reliability of continuous operation of the device.

[0036] Reference Figures 3-4A cap 362 is rotatably connected to the inlet of the low-temperature evaporation mother liquor discharge pipe 36. The cap 362 is also fixedly connected to the low-temperature evaporation mother liquor discharge pipe 36 via a tension spring 363. Specifically, one end of the tension spring 363 is fixedly connected to the low-temperature evaporation mother liquor discharge pipe 36, and the other end of the tension spring 363 is fixedly connected near the rotatable connection between the cap 362 and the low-temperature evaporation mother liquor discharge pipe 36. A guide block 361 is also provided at the discharge port of the low-temperature evaporation mother liquor discharge pipe 36. The guide block 361 is used to guide the low-temperature evaporation mother liquor away from the rotatable connection between the cap 362 and the low-temperature evaporation mother liquor discharge pipe 36.

[0037] Reference Figures 3-4 The function of the cap 362 is to prevent waste gas from entering the low-temperature evaporation mother liquor discharge pipe 36, thereby preventing contamination of the pipe. Under the action of the tension spring 363, the cap 362 seals the pipe discharge port. When the low-temperature evaporation mother liquor is discharged from the low-temperature evaporation mother liquor discharge pipe 36, the mother liquor will push the cap 362 open. The tension spring 363 is installed near the rotating connection to reduce the resistance force between the mother liquor and the tension spring 363 when the mother liquor pushes open the cap 362.

[0038] Reference Figures 3-4 The cap 362 is rotatably connected to the outlet of the low-temperature evaporation mother liquor discharge pipe 36. Under normal conditions, it remains closed under the tension of the tension spring 363, thus sealing the outlet of the discharge pipe. The main function of this closed state is to prevent the exhaust gas in the filter cartridge 31 from entering the interior of the low-temperature evaporation mother liquor discharge pipe 36, and to avoid the pipe contamination caused by viscous materials or pollutants contained in the exhaust gas. When the controller 5 receives a bubble approach signal from the infrared beam detector 37, the low-temperature evaporation mother liquor discharge pipe 36 discharges mother liquor. At this time, the pressure of the mother liquor will overcome the tension of the tension spring 363 and push open the cap 362, allowing the mother liquor to spray out. One end of the tension spring 363 is fixed to the low-temperature evaporation mother liquor discharge pipe 36, and the other end is connected to the cap 362 near its rotation axis. This arrangement results in a shorter lever arm for the tension spring 363, reducing the spring torque required to overcome when the cap 362 is opened. This reduces the spring force that the mother liquor needs to resist when it pushes open the cap 362, which helps to reduce discharge resistance and ensures timely and smooth discharge of the mother liquor.

[0039] The implementation principle of a filter device for a scraper dryer according to an embodiment of this application is as follows: the exhaust gas generated by the scraper dryer 2 enters the filter cylinder 31 through the connecting pipe 4. The path design of the connecting pipe 4 facilitates bubble bursting and material settling. The exhaust gas then passes through the Pall ring stack 312 in the filter chamber 311, where the activated carbon mesh purifies the exhaust gas. The purified gas is discharged through the exhaust pipe 34 and the exhaust pump 35. When the infrared beam detector 37 detects approaching bubbles, it sends a signal to the controller 5. The controller 5 then starts the low-temperature evaporation mother liquor discharge pipe 36 to spray mother liquor to eliminate bubbles, and simultaneously controls the exhaust pump 35 to adjust the pressure. The cover 362 is normally closed under the action of the tension spring 363 to prevent exhaust gas from entering the low-temperature evaporation mother liquor discharge pipe 36.

[0040] This application, through the path design of the connecting pipe 4 and the synergistic effect of the infrared beam detector 37 coordinated by the controller 5, the low-temperature evaporation mother liquor discharge pipe 36, and the exhaust pump 35, effectively prevents viscous materials from entering the filter chamber 311 with the air bubbles, reduces the risk of clogging of the filter assembly 3, thereby extending the maintenance interval and improving the continuous operation stability and filtration efficiency of the scraper dryer 2.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A filter device for a scraper dryer, characterized in that: The system includes a support frame (1) and a filter assembly (3). The filter assembly (3) includes a filter cylinder (31), a low-temperature evaporation mother liquor discharge pipe (36), and an exhaust pipe (34). The filter cylinder (31) and the scraper dryer (2) are both mounted on the support frame (1). The filter cylinder (31) is located above the scraper dryer (2), and the lower end of the filter cylinder (31) is connected to the scraper dryer (2) through a connecting pipe (4). The filter cylinder (31) is provided with a filter chamber (311), and the filter chamber (311) is provided with a Pall ring stack (312), and each Pall ring is provided with an activated carbon mesh; The exhaust pipe (34) is located at the upper end of the filter cylinder (31), and the low-temperature evaporation mother liquor discharge pipe (36) extends from the outer wall of the filter cylinder (31) into the interior. The low-temperature evaporation mother liquor discharge pipe (36) is located between the filter chamber (311) and the connecting pipe (4). The outlet of the low-temperature evaporation mother liquor discharge pipe (36) faces the port of the connecting pipe (4).

2. The filter device for a scraper dryer according to claim 1, characterized in that: The discharge port of the low-temperature evaporation mother liquor discharge pipe (36) is provided with a cover (362), the cover (362) is rotatably mounted on the discharge pipe, and the cover (362) is also connected to the discharge pipe by a tension spring (363).

3. A filter device for a scraper dryer according to claim 2, characterized in that: One end of the tension spring (363) is set on the low-temperature evaporation mother liquor discharge pipe (36), and the other end of the tension spring (363) is set near the rotating connection between the cap (362) and the low-temperature evaporation mother liquor discharge pipe (36); The discharge port of the low-temperature evaporation mother liquor discharge pipe (36) is also provided with a guide block (361), which is used to guide the low-temperature evaporation mother liquor away from the rotating connection between the cap (362) and the low-temperature evaporation mother liquor discharge pipe (36).

4. The filter device for a scraper dryer according to claim 1, characterized in that: The filter cylinder (31) is also provided with an infrared beam detector (37), which includes a transmitter (371) and a receiver (372). The ends of the transmitter (371) and the receiver (372) extend from the outer wall of the filter cylinder (31) into the interior, and the transmitter (371) and the receiver (372) are arranged opposite to each other.

5. A filter device for a scraper dryer according to claim 4, characterized in that: The filter assembly (3) also includes an exhaust pump (35), which is disposed on an exhaust pipe (34); The support frame (1) is also equipped with a controller (5), and the exhaust pump (35) and the infrared beam detector (37) are both connected to the controller (5) in communication.

6. A filter device for a scraper dryer according to claim 1, characterized in that: The filter cartridge (31) has an inspection door (32) on its outer wall, and the inspection door (32) is located on one side of the filter chamber (311).

7. A filter device for a scraper dryer according to claim 6, characterized in that: The inspection door (32) is provided with a clamping block (321) on the side near the filter cylinder. The filter cylinder (31) is provided with an inspection window (313) on its outer wall. The edge of the inspection window (313) is provided with a clamping mating surface that cooperates with the clamping block (321). A locking buckle (33) is provided between the inspection door (32) and the outer wall of the filter cylinder (31), and the locking buckle (33) is used to press the inspection door (32) onto the outer wall of the filter cylinder (31).

8. A filter device for a scraper dryer according to claim 1, characterized in that: The connecting pipe (4) includes a vertical pipe (41) and an inclined pipe (42). The vertical pipe (41) is connected to the inclined pipe (42), and the vertical pipe (41) and the inclined pipe (42) are arranged between the scraper dryer (2) and the filter cylinder (31).

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