Cooling system for PET (polyethylene terephthalate) hot cutting solid aggregation slice

Abstract

The utility model relates to the technical field of chemical production, in particular to a PET (polyethylene terephthalate) hot cutting solid aggregation slice cooling system, which comprises a granulator, a discharge end of the granulator is connected with a feed port of a cooler, a discharge port of the cooler is connected with a feed port of a slice bin, and a discharge port of the slice bin is connected with a slice conveying system. An air inlet of the cooler is connected with an air outlet of the heat exchanger, an air inlet of the heat exchanger is connected with an air outlet of the fan, an air inlet of the fan is connected with an air outlet of the air filter, and an air outlet of the cooler is connected with an air inlet of the cyclone separator. The problems of accumulation, adhesion and even pipeline blockage in the temporary storage and conveying process of the PET hot cutting slices can be solved, so that the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically a PET hot-cut solidification chip cooling system. Background Technology

[0002] In the continuous polymerization production of PET (polyethylene terephthalate), molten PET is typically granulated using an underwater pelletizing system. Traditional processes use low-temperature desalinated water as the cooling medium, resulting in PET chips with a low temperature after pelletizing. This reduces the likelihood of adhesion or clumping during subsequent transportation and storage, leading to a relatively stable production process.

[0003] However, in recent years, to improve the physical properties of PET chips, high-temperature demineralized water at around 80°C has been used as the medium, resulting in high temperatures (usually exceeding 100°C) for the PET chips after pelleting. In existing technology, the high-temperature chips obtained after pelleting are directly fed into a silo and transferred to the next process via a chip conveying system. However, this approach suffers from high surface viscosity of PET material at high temperatures, making the chips prone to accumulation, adhesion, and even pipe blockage during temporary storage and transport. Frequent shutdowns for manual cleaning are required during production, severely impacting efficiency and causing raw material waste and increased equipment maintenance costs. Utility Model Content

[0004] This invention provides a cooling system for PET hot-cut solidified polystyrene chips, which can solve the problem that PET hot-cut solidified polystyrene chips are prone to accumulation, adhesion, or even blockage of pipelines during temporary storage and transportation, resulting in low production efficiency and high production costs.

[0005] This application provides the following technical solution:

[0006] A PET hot-cut solidified polystyrene chip cooling system includes a pelletizer, the discharge end of which is connected to the inlet of a cooler, the discharge outlet of which is connected to the inlet of a chip hopper, and the discharge outlet of the chip hopper is connected to a chip conveying system; the air inlet of the cooler is connected to the air outlet of a heat exchanger, the air inlet of the heat exchanger is connected to the air outlet of a fan, the air inlet of the fan is connected to the air outlet of an air filter, and the air outlet of the cooler is connected to the air inlet of a cyclone separator.

[0007] Beneficial effects: The material is sliced ​​by the pelletizer, and the slices are cooled by the cooler before entering the slice hopper. This effectively reduces the temperature of the slices in the hopper, significantly reducing the surface stickiness of the slices at high temperatures. This prevents the slices from piling up and sticking together during temporary storage and transportation, effectively preventing pipeline blockage, reducing downtime caused by cleaning blockages, improving production efficiency, and reducing production costs. The air circulation system, consisting of an air filter, fan, and heat exchanger, filters and regulates the air entering the cooler, ensuring that the cooling air is clean and at a suitable temperature, preventing impurities from contaminating the slices and improving product purity. The cooler outlet is connected to a cyclone separator, which separates impurities carried in the cooling air, facilitating recycling, reducing material waste, maintaining system cleanliness, and preventing pipeline blockage. Simultaneously, it ensures the stability and reliability of system operation, reduces malfunctions, extends equipment lifespan, and lowers maintenance costs.

[0008] Furthermore, the air outlet of the cooler is connected to the air inlet of the first pipeline, and the air outlet of the first pipeline is connected to the air inlet of the cooler. A cyclone separator, a fan, and a heat exchanger are sequentially arranged on the first pipeline from the air inlet to the air outlet. A second pipeline is provided on the first pipeline, and the air outlet of the second pipeline is located between the cyclone separator and the fan. A second valve and an air filter are sequentially arranged on the second pipeline from the air inlet to the air outlet.

[0009] Beneficial effects: An air circulation loop is formed through the first pipeline, the cooling air can be reused, and the heat exchanger only needs to make minor adjustments to the circulating air, which reduces energy consumption and saves production costs.

[0010] Furthermore, a first valve is provided on the first pipeline, the first valve being located between the fan and the heat exchanger, and a third pipeline is provided on the first pipeline, the third pipeline being located between the fan and the first valve, and a third valve being provided on the third pipeline.

[0011] Beneficial effects: By adjusting the opening of the first valve and the third valve, the pressure in the first pipeline is kept stable, ensuring stable airflow in the entire cooling system and avoiding poor cooling effect or equipment damage due to pressure fluctuations.

[0012] Furthermore, a fourth valve is provided on the first pipeline, the fourth valve being located between the cyclone separator and the second pipeline. A fourth pipeline is provided on the first pipeline, the air inlet of the fourth pipeline being located between the cyclone separator and the fourth valve. A fifth valve is provided on the fourth pipeline. A first temperature sensor is provided on the first pipeline, the first temperature sensor being located near the air outlet of the cyclone separator.

[0013] Beneficial effects: The first temperature sensor, located at the outlet of the cyclone separator, can monitor the temperature of the circulating air in real time. Based on the data from the first temperature sensor, the controller can adjust the opening of the fourth and fifth valves to achieve the recycling of cold air, reducing energy consumption and preventing hot air from circulating to the heat exchanger, thus improving the heat exchanger's energy efficiency.

[0014] Furthermore, the outlet of the fourth pipeline is connected to the air inlet of the crystallizer, and the fourth pipeline is provided with a fifth valve, a fan, and a heat exchanger in sequence from the air inlet to the air outlet.

[0015] Beneficial effects: During the slicing cooling process, the hot air discharged from the cooler still contains a certain amount of heat after passing through the cyclone separator. The branching setting can introduce this part of the hot air into the crystallizer to provide heat for the crystallizer, realize the recovery and reuse of heat, improve energy utilization efficiency, and reduce the energy consumption of the entire production system.

[0016] Furthermore, a fifth pipeline is provided between the fourth pipeline and the second pipeline. The air inlet of the fifth pipeline is located on the second pipeline and connected to the air outlet of the air filter. The air outlet of the fifth pipeline is located between the fifth valve and the fan on the fourth pipeline. A sixth valve is provided on the fifth pipeline. A seventh valve is provided on the second pipeline. The seventh valve is located between the fifth pipeline and the first pipeline. A sixth pipeline is provided on the fourth pipeline. The air inlet of the sixth pipeline is located between the fan and the heat exchanger on the fourth pipeline. An eighth valve is provided on the sixth pipeline.

[0017] Beneficial effects: By setting multiple valves, the airflow and direction of each pipeline can be flexibly controlled, and the pressure in the pipeline can be effectively controlled to avoid equipment damage or safety accidents.

[0018] Furthermore, the air outlet of the crystallizer is connected to the air inlet of the seventh pipeline, the air outlet of the seventh pipeline is connected to the first pipeline, and the air outlet of the seventh pipeline is located between the cooler and the cyclone separator.

[0019] Beneficial effects: The seventh pipeline can effectively recover heat, improve energy efficiency, reduce energy consumption, and protect the environment.

[0020] Furthermore, a second temperature sensor is provided on the second pipeline, and the second temperature sensor is located near the air inlet end of the second pipeline.

[0021] Beneficial effects: The temperature of the incoming air can be monitored in real time by the second temperature sensor, enabling precise control of the cooling system and improving energy efficiency.

[0022] Furthermore, the pelletizer, cooler, slice hopper, slice conveying system, cyclone separator, fan, heat exchanger, and air filter are all connected to the controller.

[0023] Beneficial effects: The controller enables centralized management and automated control of various devices, reducing manual intervention and improving production efficiency and product quality stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a PET hot-cut solidification slicing cooling system according to Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of a second embodiment of the PET hot-cut solidification slicing cooling system of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of a third embodiment of the PET hot-cut solidification slicing cooling system of this utility model. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The markings in the accompanying drawings include: pelletizer 1, cooler 2, slice hopper 3, slice conveying system 4, first heat exchanger 5, first fan 6, air filter 7, cyclone separator 8, impurity removal tank 9, first temperature sensor 10, second temperature sensor 11, crystallizer 12, second fan 13, and second heat exchanger 14.

[0029] First pipeline L1, second pipeline L2, third pipeline L3, fourth pipeline L4, fifth pipeline L5, sixth pipeline L6, seventh pipeline L7;

[0030] First valve T1, second valve T2, third valve T3, fourth valve T4, fifth valve T5, sixth valve T6, seventh valve T7, eighth valve T8, and impurity removal valve T9.

[0031] Example 1

[0032] like Figure 1As shown, a PET hot-cut solidification chip cooling system includes multiple pelletizers 1. The discharge ends of the pelletizers 1 are connected to the inlet of a cooler 2 via material pipelines. The discharge outlet of the cooler 2 is connected to the inlet of a chip hopper 3 via a material pipeline. The discharge outlet of the chip hopper 3 is connected to a chip conveying system 4. The air inlet of the cooler 2 is connected to the air outlet of a first heat exchanger 5. The air inlet of the first heat exchanger 5 is connected to the air outlet of a first fan 6. The air inlet of the fan is connected to the air outlet of an air filter 7. The air outlet of the cooler 2 is connected to the air inlet of a cyclone separator 8. The cooler 2 has a feed inlet and an air outlet at the top, and a discharge outlet and an air inlet at the bottom. A screen is located in the middle of the inner side of the cooler 2, dividing the inner side of the cooler 2 into two chambers: an upper chamber and a lower chamber. The upper chamber is connected to the feed inlet, discharge outlet, and air outlet of the cooler 2, while the lower chamber is connected to the air inlet of the cooler 2. The first fan 6 can be a pulse fan.

[0033] Specifically, the air outlet of cooler 2 is connected to the air inlet of the first pipeline L1, and the air outlet of the first pipeline L1 is connected to the air inlet of cooler 2. From the air inlet to the air outlet, the first pipeline L1 is sequentially equipped with a cyclone separator 8, a first fan 6, and a first heat exchanger 5. A second pipeline L2 is also installed on the first pipeline L1, with its air outlet located between the cyclone separator 8 and the first fan 6. From the air inlet to the air outlet, the second pipeline L2 is sequentially equipped with a second valve T2 and an air filter 7. The first pipeline L1 is equipped with a first valve T1, located between the first fan 6 and the first heat exchanger 5. A third pipeline L3 is also installed on the first pipeline L1, located between the first fan 6 and the first valve T1. The third pipeline L3 is equipped with a third valve T3. The impurity removal port of the cyclone separator 8 is connected to an impurity removal tank 9 via an impurity removal pipe, and an impurity removal valve T9 is installed on the impurity removal pipe.

[0034] The pelletizer 1, cooler 2, slice hopper 3, slice conveying system 4, cyclone separator 8, first fan 6, first heat exchanger 5, air filter 7, first valve T1, second valve T2, and third valve T3 are electrically connected to the controller.

[0035] The usage method is as follows:

[0036] During production, multiple pelletizers 1 operate simultaneously to cut PET material. High-temperature chips are output from the pelletizer's discharge end. These chips enter the cooler 2 through the inlet for cooling and then exit from the cooler 2's outlet to the chip hopper 3. The chips in the chip hopper 3 are then fed into subsequent processes via a cutting and conveying system according to production needs. Simultaneously, air, driven by the first fan 6, is filtered through the air filter 7 and undergoes heat exchange in the first heat exchanger 5 to form cold air. This cold air enters the cooler 2 through the air inlet, passes through the screen inside the cooler, exchanges heat with the chips falling onto the screen, and is then discharged from the cooler 2's outlet. It then passes through a cyclone separator 8 for impurity removal. The impurities separated by the cyclone separator 8 enter the impurity removal tank 9 through a removal pipe. The air that has passed through the cyclone separator 8 is circulated back into the cooler 2 for reuse by the first fan 6, or it can be discharged into the atmosphere through the third pipeline L3.

[0037] Example 2

[0038] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that a fourth valve T4 is provided on the first pipeline L1, located between the cyclone separator 8 and the second pipeline L2. The air inlet of the fourth pipeline L4 is located between the cyclone separator 8 and the fourth valve T4. A fifth valve T5 is provided on the fourth pipeline L4. A first temperature sensor 10 is provided on the first pipeline L1, located near the air outlet of the cyclone separator 8. A second temperature sensor 11 is provided on the second pipeline L2, located near the air inlet of the second pipeline L2. The fourth valve T4, the fifth valve T5, the first temperature sensor 10, and the second temperature sensor 11 are all electrically connected to the controller.

[0039] During production, the controller monitors the air temperature at the outlet of the cyclone separator 8 in real time via the first temperature sensor 10, and monitors the temperature of the incoming air at the inlet of the second pipeline L2 in real time via the second temperature sensor 11. When the air temperature at the outlet of the cyclone separator 8 is lower than the temperature of the incoming air, the controller closes the fifth valve T5 and opens the fourth valve T4. The air passing through the cyclone separator 8 is then circulated to the first heat exchanger 5 and cooler 2 by the first fan 6, thereby reducing energy consumption. When the air temperature at the outlet of the cyclone separator 8 is higher than the temperature of the incoming air, the controller closes the fourth valve T4 and opens the fifth valve T5. The air passing through the cyclone separator 8 is discharged from the first pipeline L1 through the fourth pipeline L4; simultaneously, the second valve T2 opens to replenish the first pipeline with incoming air, ensuring normal cooling operation.

[0040] Example 3

[0041] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the outlet of the fourth pipeline L4 is connected to the air inlet of the crystallizer 12. From the air inlet to the outlet, the fourth pipeline L4 is sequentially equipped with a fifth valve T5, a second fan 13, and a second heat exchanger 14. A fifth pipeline L5 is located between the fourth pipeline L4 and the second pipeline L2. The air inlet of the fifth pipeline L5 is located on the second pipeline L2 and connected to the air outlet of the air filter 7. The air outlet of the fifth pipeline L5 is located between the fifth valve T5 and the second fan 13 on the fourth pipeline L4. A sixth valve T6 is provided on the fifth pipeline L5. A seventh valve T7 is provided on the second pipeline L2, located between the fifth pipeline L5 and the first pipeline L1. A sixth pipeline L6 is provided on the fourth pipeline L4, with its air inlet located between the fan and the heat exchanger. An eighth valve T8 is provided on the sixth pipeline L6. The air outlet of crystallizer 12 is connected to the air inlet of the seventh pipe L7; the air outlet of the seventh pipe L7 is connected to the first pipe L1, and the air outlet of the seventh pipe L7 is located between cooler 2 and cyclone separator 8. Crystallizer 12, second fan 13, second heat exchanger 14, sixth valve T6, seventh valve T7, and eighth valve T8 are electrically connected to the controller.

[0042] During production, the controller monitors the air temperature at the outlet of the cyclone separator 8 in real time via the first temperature sensor 10, and monitors the temperature of the incoming air at the inlet of the second pipeline L2 in real time via the second temperature sensor 11. When the air temperature at the outlet of the cyclone separator 8 is lower than the temperature of the incoming air, the controller controls the fifth valve T5 to close and the fourth valve T4 to open. The air passing through the cyclone separator 8 is circulated to the first heat exchanger 5 and the cooler 2 by the first fan 6, thereby reducing energy consumption. At the same time, the controller controls the second valve T2 and the sixth valve T6 to open. The incoming air is filtered by the air filter 7 by the second fan 13, and heat exchanged by the heat exchanger to form hot air. The hot air enters the crystallizer 12 from the air inlet and exchanges heat with the material. It is discharged from the air outlet of the crystallizer 12 and passes through the cyclone separator 8 to remove impurities. The air is then circulated to the cooler 2 or the crystallizer 12 according to the air temperature at the outlet of the cyclone separator 8. When the air temperature at the outlet of the cyclone separator 8 is higher than the temperature of the incoming air, the controller controls the fourth valve T4 to close and the fifth valve T5 to open. The air passing through the cyclone separator 8 passes through the second fan 13 and the second heat exchanger 14 on the fourth pipeline L4 and enters the crystallizer 12 to achieve heat recovery. At the same time, the controller controls the second valve T2 and the seventh valve T7 to open. The incoming air, under the action of the first fan 6, passes through the first heat exchanger 5 to form cold air, and enters the cooler 2 to exchange heat with the material to achieve cooling of the material.

[0043] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A PET hot cut solidified chip cooling system comprising a granulator, characterized in that, The discharge end of the pelletizer is connected to the inlet of the cooler, the discharge outlet of the cooler is connected to the inlet of the slice hopper, and the discharge outlet of the slice hopper is connected to the slice conveying system; the air inlet of the cooler is connected to the air outlet of the heat exchanger, the air inlet of the heat exchanger is connected to the air outlet of the fan, the air inlet of the fan is connected to the air outlet of the air filter, and the air outlet of the cooler is connected to the air inlet of the cyclone separator.

2. The PET hot cut solidified chip cooling system of claim 1, wherein: The air outlet of the cooler is connected to the air inlet of the first pipeline, and the air outlet of the first pipeline is connected to the air inlet of the cooler. A cyclone separator, a fan, and a heat exchanger are sequentially arranged on the first pipeline from the air inlet to the air outlet. A second pipeline is provided on the first pipeline, and the air outlet of the second pipeline is located between the cyclone separator and the fan. A second valve and an air filter are sequentially arranged on the second pipeline from the air inlet to the air outlet.

3. The PET hot cut solidified chip cooling system of claim 2, wherein: The first pipeline is equipped with a first valve, which is located between the fan and the heat exchanger. The first pipeline is also equipped with a third pipeline, which is located between the fan and the first valve, and is equipped with a third valve.

4. The PET hot cut solidified chip cooling system of claim 2, wherein: The first pipeline is equipped with a fourth valve, which is located between the cyclone separator and the second pipeline. The first pipeline is equipped with a fourth pipeline, and the air inlet of the fourth pipeline is located between the cyclone separator and the fourth valve. The fourth pipeline is equipped with a fifth valve. The first pipeline is equipped with a first temperature sensor, which is located near the air outlet of the cyclone separator.

5. The PET hot cut solidified chip cooling system of claim 4, wherein: The outlet of the fourth pipeline is connected to the air inlet of the crystallizer. The fourth pipeline is provided with a fifth valve, a fan, and a heat exchanger in sequence from the air inlet to the air outlet.

6. The PET hot cut fixed phase chip cooling system of claim 5, wherein: A fifth pipeline is provided between the fourth pipeline and the second pipeline. The air inlet of the fifth pipeline is located on the second pipeline and connected to the air outlet of the air filter. The air outlet of the fifth pipeline is located between the fifth valve and the fan on the fourth pipeline. A sixth valve is provided on the fifth pipeline. A seventh valve is provided on the second pipeline. The seventh valve is located between the fifth pipeline and the first pipeline. A sixth pipeline is provided on the fourth pipeline. The air inlet of the sixth pipeline is located between the fan and the heat exchanger on the fourth pipeline. An eighth valve is provided on the sixth pipeline.

7. The PET hot cut solidified chip cooling system of claim 5, wherein: The air outlet of the crystallizer is connected to the air inlet of the seventh pipeline, the air outlet of the seventh pipeline is connected to the first pipeline, and the air outlet of the seventh pipeline is located between the cooler and the cyclone separator.

8. The PET hot cut solidified chip cooling system according to any one of claims 2 to 7, characterized in that: A second temperature sensor is provided on the second pipeline, and the second temperature sensor is located near the air inlet end of the second pipeline.

9. The PET hot cut solid poly slice cooling system of claim 1, wherein: The pelletizer, cooler, slice hopper, slice conveying system, cyclone separator, fan, heat exchanger, and air filter are all connected to the controller.

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