Regenerated DMT granulation production system

Abstract

The utility model discloses a regeneration DMT granulation production system which comprises a flaker, a granulator, a screening device and a stock bin, the flaker is provided with a feeding pipe opening, regeneration DMT in a molten state is input into the flaker through the feeding pipe opening, a roller is rotatably installed in the flaker, the lower end part of the roller is immersed in the regeneration DMT in the molten state, and the lower end part of the roller is connected with the screening device. A scraper mechanism is installed on the side of the roller in a matched mode, a pipeline at the outlet end of the flaker is connected to the pelletizer, a pair of rollers are installed in the pelletizer in a rotating mode, a pipeline at the outlet end of the pelletizer is connected to the screening device, and a first elevator is installed between the screening device and the stock bin. Production of granular DMT products is completed through a series of procedures of cooling crystallization, scraping treatment, extrusion granulation, screening and warehousing and the like, and systematic equipment support is provided for expanding and applying regenerated DMT to the fields of engineering plastics and the like.

Description

Technical Field

[0001] This utility model relates to the field of chemical recycling technology for waste textiles, and more specifically, to a recycled DMT granulation production system. Background Technology

[0002] The chemical recycling process for producing recycled DMT (dimethyl terephthalate) represents a significant technological breakthrough in the field of resource recycling. The main raw material for producing recycled DMT is waste textiles containing 90% polyester fiber, thus solving the environmental recycling problem of waste textiles.

[0003] Currently, recycled DMT produced by chemical recycling is mainly used in polyester chips and polyester spinning. Expanding the application of recycled DMT to engineering plastics and other fields is the company's main research direction. This will expand the application of recycled DMT and bring a broader market to the company. To expand the application of recycled DMT to engineering plastics and other fields, the first step is to solve the granulation production needs of recycled DMT (this field requires recycled DMT products to be in granular form). This case arises from this. Utility Model Content

[0004] The purpose of this invention is to address the needs of the prior art and provide a recycled DMT granulation production system. This invention has a reasonable production layout and completes the production of granular DMT products through a series of processes such as cooling crystallization, scraping treatment, extrusion granulation, screening and warehousing. This invention provides systematic equipment support for expanding the application of recycled DMT to fields such as engineering plastics.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A recycled DMT granulation production system includes a flake generator, a granulator, a screening device, and a silo. The flake generator is equipped with a feed inlet through which molten recycled DMT is fed into the flake generator. A roller is rotatably installed inside the flake generator, with its lower end immersed in the molten recycled DMT. A scraper mechanism is installed on the side of the roller. The outlet pipe of the flake generator is connected to the granulator. A pair of rollers are rotatably installed inside the granulator. The outlet pipe of the granulator is connected to the screening device. A first elevator is installed between the screening device and the silo.

[0007] Furthermore, the sheeter includes a first housing, the feed inlet is connected to the side of the first housing, the roller is equipped with a water cooling system, and the height to which the molten regenerated DMT is immersed in the roller is no more than one-third of the total height of the roller.

[0008] Furthermore, the scraper mechanism includes a blade and a receiving trough. The blade is installed at an angle, with the blade edge located at the highest point of the blade and contacting the outer surface of the roller. The lowest point of the blade is connected to the receiving trough, and the bottom of the receiving trough is connected to a vertically downward discharge pipe.

[0009] Furthermore, the granulator includes a receiving hopper and a second housing. The outlet pipe of the receiving hopper is connected to the second housing. A pair of rollers are installed inside the second housing. The connecting pipe between the receiving hopper and the second housing is T-shaped. A first conveyor and a second conveyor are installed in the T-shaped pipe. The first conveyor is installed horizontally, and the second conveyor is installed vertically.

[0010] Furthermore, a pair of the rollers includes two rollers that rotate synchronously and in opposite directions. The rollers have a number of grooves evenly distributed on their surfaces. The rotation of the two rollers can create a one-to-one matching effect of the grooves on their surfaces.

[0011] Furthermore, a gap is provided between adjacent grooves, with the gap size set to 1-3mm.

[0012] Furthermore, the screening device adopts a three-dimensional vibrating screen, and a screen mesh is installed inside the screening device. The side of the screening device is connected to the first discharge port, which is located above the screen mesh. The first elevator adopts a Z-type belt elevator, and the first discharge port pipeline is connected to the inlet end of the first elevator. The outlet end of the first elevator is connected to the silo.

[0013] Furthermore, it also includes a second elevator, and a second discharge port is installed on the side of the screening device. The second discharge port is located below the screen. The second discharge port pipeline is connected to the inlet end of the second elevator, and the outlet end of the second elevator is connected to the receiving hopper of the granulator. The second elevator is a chain bucket elevator.

[0014] Furthermore, the flake machine is connected to a dust removal device, which includes a dust collector and an induced draft fan. The induced draft fan is connected to the top pipeline of the flake machine, and the dust collector is installed on the connecting pipeline between the induced draft fan and the flake machine. The induced draft fan creates negative pressure.

[0015] The beneficial effects of this utility model are:

[0016] This invention features a rational production layout, completing the production of granular DMT products through a series of processes including cooling crystallization, scraping, extrusion granulation, and screening for storage. It also incorporates a material recycling structure, ensuring full utilization of raw materials. This invention provides systematic equipment support for expanding the application of recycled DMT to fields such as engineering plastics. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure of a regenerated DMT granulation production system in this embodiment;

[0018] Figure 2 This is a schematic diagram of the internal structure of the slagging machine in this embodiment;

[0019] Figure 3 This is a schematic diagram of the connection structure between the dust removal device and the flake generator in this embodiment;

[0020] Figure 4 This is a partial structural diagram of the roll surface in this embodiment.

[0021] Reference numerals in the attached drawings: 1. Granulator; 11. First housing; 111. Feed inlet; 12. Roller; 13. Scraper mechanism; 131. Blade; 132. Feed trough; 133. Discharge pipe; 2. Granulator; 2. Receiving hopper; 21. Second housing; 22. Roller; 231. Groove; 24. First conveyor; 25. Second conveyor; 3. Screening device; 31. Screen; 32. First discharge port; 33. Second discharge port; 4. Hopper; 5. First elevator; 6. Second elevator; 7. Dust removal device; 71. Dust collector; 72. Exhaust fan. Detailed Implementation

[0022] 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.

[0023] like Figures 1-4The illustrated recycled DMT granulation production system includes a granulator 1, a granulator 2, a screening device 3, and a silo 4. The granulator 1 is equipped with a feed inlet 111, through which molten recycled DMT (derived from the chemical recycling of waste textiles) is fed into the granulator 1. The temperature of the input material is maintained at 150°C to ensure that the recycled DMT is in a molten state. The recycled DMT is pumped in by a DMT delivery pump. The pipeline from the DMT delivery pump to the granulator 1 is equipped with a 6S heat tracing sleeve (steam insulation) to ensure smooth material flow. Inside the sheet-forming machine 1, a roller 12 is rotatably installed. The lower end of the roller 12 is immersed in molten recycled DMT. The roller 12 is a model with its own water cooling system. The roller 12 is an existing piece of equipment purchased from the market, and its structure and principle will not be described in detail. The roller 12 maintains a relatively low temperature (controlled at around 30℃) through the circulating water cooling effect of the water cooling system. When the molten recycled DMT comes into contact with the roller surface of the roller 12, it can achieve a cooling and crystallization effect. The cooled and crystallized recycled DMT will adhere to the roller surface of the roller 12 to form a thin film. A scraper is installed on the side of the roller 12. Mechanism 13: As roller 12 rotates, the film-like regenerated DMT moves to the scraper mechanism 13. The scraper mechanism 13 scrapes off the crystallized regenerated DMT, forming a sheet-like regenerated DMT product (also mixed with some powdered regenerated DMT). The outlet pipe of the flaking machine 1 is connected to the granulator 2. A pair of rollers 23 are rotatably installed inside the granulator 2. The sheet-like regenerated DMT product collected by the flaking machine 1 is fed into the granulator 2, where it is extruded by the action of the rollers 23 to form regenerated DMT granules. Because the regenerated DMT granules contain unformed materials or powder, this utility model... The new invention connects the outlet pipe of the granulator 2 to the screening device 3, which screens out recycled DMT granules that meet production requirements. A first elevator 5 is installed between the screening device 3 and the silo 4. The screened recycled DMT granules that meet production requirements are transported to the silo 4 for storage via the first elevator 5. The resulting recycled DMT granules are of uniform size. This invention produces recycled DMT granules to meet the needs of applications in engineering plastics and other fields. The application of this invention can expand the application areas of recycled DMT and bring a broader market to the company.

[0024] like Figure 2As shown, the flake machine 1 includes a first housing 11. A feed inlet 111 is connected to the side of the first housing 11. The feed inlet 111 introduces molten regenerated DMT liquid at 150°C. A control valve is installed on the feed inlet 111 to control the opening and closing of the input. The height of the molten regenerated DMT liquid submerging the roller 12 is no higher than one-third of the total height of the roller 12. In other words, the liquid level of the molten regenerated DMT liquid must be controlled to prevent overflow. The rotation of the roller 12 is achieved by the motor power system of the flake machine 1. Using a motor to drive the roller 12 is a conventional technology and will not be described in detail here. A scraper mechanism 13 is installed on the side of the roller 12. The scraper mechanism 13 includes a blade 131 and a receiving trough 132. The blade 131 is installed at an angle, with its cutting edge located at its highest point. The cutting edge of the blade 131 contacts the outer surface of the roller 12, and the cutting edge faces the rotation direction of the roller 12. Figure 2 In the process, the roller 12 needs to rotate clockwise. The low point of the blade 131 is connected to the receiving trough 132. The blade 131 can continuously scrape off the crystalline regenerated DMT on the surface of the roller 12. The scraped DMT is mostly in flake form and mixed with some powder. The scraped DMT falls naturally along the blade 131 and comes to the receiving trough 132. The bottom of the receiving trough 132 is connected to a vertically downward discharge pipe 133. The scraped DMT is output through the discharge pipe 133. The thickness of the crystalline regenerated DMT film formed on the roller 12 is determined by the rotation speed of the roller 12. The faster the rotation speed of the roller 12, the thinner the regenerated DMT film. The slower the rotation speed of the roller 12, the thicker the regenerated DMT film. To ensure smooth scraping, the thickness of the regenerated DMT film is controlled between 0.5-1 mm.

[0025] like Figure 1 As shown, the granulator 2 includes a receiving hopper 21 and a second housing 22. The receiving hopper 21 is installed corresponding to the discharge pipe 133 of the flake maker 1 and is used to receive the regenerated DMT output by the flake maker 1. The outlet pipe of the receiving hopper 21 is connected to the second housing 22. A pair of rollers 23 are installed inside the second housing 22. The pair of rollers 23 includes two synchronously rotating and counter-rotating rollers 23. The rollers 23 are also driven to rotate by a motor. The synchronously rotating and counter-rotating motor-driven structure is also a conventional technology and will not be described in detail here. Figure 4As shown, several grooves 231 are evenly distributed on the surface of the roller 23. The rotation of the two rollers 23 can create a one-to-one matching effect of the grooves 231 on the roller surface. The recycled DMT material is extruded and shaped into granules within the grooves 231. The grooves 231 can be designed as pits with a diameter of 24mm and a depth of 6mm, so that the material can be extruded into 24*12 flat spherical DMT granules. The connecting pipe between the receiving hopper 21 and the second housing 22 is T-shaped. The first conveyor 24 and the second conveyor 25 are installed in the T-shaped pipe. The first conveyor 24 is installed horizontally, and the second conveyor 25 is installed horizontally. The first conveyor 24 and the second conveyor 25 are both commercially available screw conveyors. During the screw conveying process, the sheet-like recycled DMT can be agitated into powder. The second conveyor 25 is located directly above a pair of rollers 23. The material output from the second conveyor 25 falls precisely between the pair of rollers 23 to facilitate the extrusion molding operation of the pair of rollers 23. If the crushed state of the recycled DMT is not ideal during use, this utility model can also install a crushing device at the receiving hopper 21 to crush it in advance, which can better ensure that what enters the rollers 23 is recycled DMT powder.

[0026] A gap is provided between adjacent grooves 231, so the extruded DMT granules will have a thin film connecting them (similar to cake making, where the grooves 231 are the molds, and the produced cakes will have thin layers connecting them). These films need to be separated and removed. This invention uses a screening device 3 for screening and separation. The screening device 3 of this invention adopts a three-dimensional vibrating screen, which is an existing equipment purchased from the market. Its internal structure and principle will not be described in detail. A screen 31 is installed inside the screening device 3. The aperture of the screen 31 is set to 9*9mm, which is smaller than the diameter of the DMT granules. This invention sets the gap between adjacent grooves 231 on the roller 23 to 1-3mm, so that the area of ​​the connecting film between the DMT granules will be smaller than the aperture of the screen 31. The vibrating screen generates vibration in the material. During the vibration, the DMT granules and the connecting film will break and separate. Due to the aperture of the screen 31, the DMT granules and the connecting film will be screened and separated. The side of the screening device 3 is connected to the first discharge port 32, which is located above the screen 31. Since the diameter of the DMT granules is larger than the aperture of the screen 31, the DMT granules are located above the screen 31, and the first discharge port 32 outputs the DMT granules. The first elevator 5 is a Z-type belt elevator. The first discharge port 32 is connected to the inlet end of the first elevator 5, and the outlet end of the first elevator 5 is connected to the silo 4. The finished DMT granules are transported to the silo 4 for storage by the first elevator 5. The first elevator 5 is a Z-type belt elevator with a processing capacity of 1m³. 3 / hour, lifting height 6M, using frequency conversion speed control.

[0027] The screening device 3 can also screen out non-formed materials such as connecting films (which may be a mixture of flakes and powders). These materials fall through the screen 31. A second discharge port 33 is installed on the side of the screening device 3, located below the screen 31. Therefore, these non-formed materials are output through the second discharge port 33, allowing the materials to be reused. Therefore, this invention also includes a second elevator 6. The second discharge port 33 is connected to the inlet of the second elevator 6, and the outlet of the second elevator 6 is connected to the receiving hopper 21 of the granulator 2, so that these non-formed materials can be returned to the granulator 2 for reuse, avoiding material waste. The second elevator 6 of this invention is a chain bucket elevator with a lifting height of 10M and a processing capacity of 1m³. 3 / hour, using variable frequency speed control.

[0028] Dust will occur inside the machine chamber during scraping-type flake production. To control the amount of dust, such as... Figure 3 As shown, the flake machine 1 is connected to a dust removal device 7, which includes a dust collector 71 and an induced draft fan 72. The induced draft fan 72 is connected to the top pipe of the flake machine 1. The dust collector 71 is installed on the connecting pipe between the induced draft fan 72 and the flake machine 1. The induced draft fan 72 forms a negative pressure to suck up the dust from the flake machine 1. The negative pressure is set to 1-2 kPa. The negative pressure is relatively small, which satisfies the dust suction requirements without affecting normal flake production. The dust collector 71 is a bag filter, which can capture DMT dust.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A regenerative DMT prilling production system, characterized by, The assembly includes a flake generator (1), a granulator (2), a screening device (3), and a silo (4). The flake generator (1) is provided with a feed inlet (111) through which molten regenerated DMT is fed into the flake generator (1). A roller (12) is rotatably installed inside the flake generator (1). The lower part of the roller (12) is immersed in the molten regenerated DMT. A scraper mechanism (13) is installed on the side of the roller (12). The outlet pipe of the flake generator (1) is connected to the granulator (2). A pair of rollers (23) are rotatably installed inside the granulator (2). The outlet pipe of the granulator (2) is connected to the screening device (3). A first elevator (5) is installed between the screening device (3) and the silo (4).

2. The recycled DMT granulation production system according to claim 1, characterized in that, The sheet forming machine (1) includes a first housing (11), the feed port (111) is connected to the side of the first housing (11), the roller (12) is provided with a water cooling system, and the height of the molten regenerated DMT immersed in the roller (12) is no more than one-third of the total height of the roller (12).

3. The system for regenerating DMT prilling production according to claim 1, characterized in that, The scraper mechanism (13) includes a blade (131) and a receiving trough (132). The blade (131) is installed at an angle, and the cutting edge of the blade (131) is located at the high point of the blade (131). The cutting edge of the blade (131) contacts the outer surface of the roller (12). The low point of the blade (131) is connected to the receiving trough (132). The bottom of the receiving trough (132) is connected to a vertically downward discharge pipe (133).

4. The system for regenerating DMT prilling production according to claim 1, characterized in that, The granulator (2) includes a receiving hopper (21) and a second housing (22). The outlet end of the receiving hopper (21) is connected to the second housing (22). A pair of rollers (23) are installed inside the second housing (22). The connecting pipe between the receiving hopper (21) and the second housing (22) is T-shaped. A first conveyor (24) and a second conveyor (25) are installed in the T-shaped pipe. The first conveyor (24) is installed horizontally, and the second conveyor (25) is installed vertically.

5. The system for regenerative DMT pellet production of claim 1, wherein, A pair of rollers (23) includes two rollers (23) that rotate synchronously and in opposite directions. Several grooves (231) are evenly distributed on the roller surface of the rollers (23). The rotation of the two rollers (23) can form a one-to-one matching effect of the grooves (231) on the roller surface.

6. The regenerated DMT prilling production system according to claim 5, wherein, A gap is provided between adjacent grooves (231), and the gap size is set to 1-3mm.

7. The system for regenerative DMT pellet production of claim 1, wherein, The screening device (3) adopts a three-dimensional vibrating screen. A screen (31) is installed inside the screening device (3). The side of the screening device (3) is connected to the first discharge port (32). The first discharge port (32) is located above the screen (31). The first elevator (5) adopts a Z-type belt elevator. The pipe of the first discharge port (32) is connected to the inlet end of the first elevator (5). The outlet end of the first elevator (5) is connected to the silo (4).

8. The regenerated DMT prilling production system of claim 4, wherein, It also includes a second elevator (6), and a second discharge port (33) is installed on the side of the screening device (3). The second discharge port (33) is located below the screen (31). The pipe of the second discharge port (33) is connected to the inlet end of the second elevator (6). The outlet end of the second elevator (6) is connected to the receiving hopper (21) of the granulator (2). The second elevator (6) is a chain bucket elevator.

9. The system for regenerative DMT pellet production of claim 1, wherein, The flaking machine (1) is connected to a dust removal device (7), which includes a dust collector (71) and an induced draft fan (72). The induced draft fan (72) is connected to the top pipeline of the flaking machine (1), and the dust collector (71) is installed on the connecting pipeline between the induced draft fan (72) and the flaking machine (1). The induced draft fan (72) generates negative pressure.

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