Cooling and deslagging device for polyester liquid seal tank

Abstract

The utility model relates to the technical field of polyester production, and discloses a polyester liquid seal tank cooling and deslagging device which comprises a liquid seal tank, a liquid seal tank liquid inlet pipe is arranged above the liquid seal tank in a communicated mode, an inner chamber and outer chamber partition plate is fixedly connected to the inner wall of the liquid seal tank, and an inner chamber outer wall coil pipe is fixedly installed on the outer wall of the liquid seal tank. A cooling collecting plate is arranged in the liquid seal tank, a liquid seal tank outer chamber outlet is formed in the bottom of the right side of the liquid seal tank in a communicating mode, and a liquid seal tank inner chamber outlet is formed in the bottom of the liquid seal tank in a communicating mode. According to the cooling and deslagging device for the polyester liquid seal tank, the temperature of a solution is reduced in the liquid seal tank stage, precipitation of precipitates in the solution is promoted, the pollution speed of a plate heat exchanger, a flow meter and the like on a spraying pipeline is reduced, the service time is prolonged, and the hot washing frequency of the spraying pipeline is reduced; and secondly, the precipitates are agglomerated and flaked through extrusion of the scraper.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production, in particular to a polyester liquid sealing tank cooling and slag removal device. Background Art

[0002] At present, in the polyester melt polymerization production process, the widely used vacuum system mainly consists of scraper spray system, vacuum jet pump spray system, power steam evaporator and liquid ring vacuum pump system. Generally, the scraper spray system needs to clean a large amount of impurities, so it usually adopts a vertical liquid seal tank to facilitate the cleaning of impurities. The vacuum jet pump spray system adopts a horizontal liquid seal tank, which has fewer impurities and does not need to be cleaned specifically.

[0003] However, the vacuum jet pump spray system cannot completely prevent the entry of impurities. As the equipment runs for a long time, the ethylene glycol in the circulation spray contains a large amount of impurities. As a result, the impurities are precipitated and attached to the inner wall of the spray pipeline and the inside of the spray tower. Once blocked, the spray system may be paralyzed in an instant, causing vacuum fluctuations and forced to stop. Therefore, a slag removal device that can remove the precipitates dissolved in ethylene glycol is needed. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies of the prior art, the utility model provides a polyester liquid seal tank cooling and slag removal device.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a polyester liquid seal tank cooling and slag removal device, comprising a liquid seal tank, a liquid seal tank liquid inlet pipe is arranged on the top of the liquid seal tank, the inner wall of the liquid seal tank is fixedly connected with inner and outer chamber partitions, the outer wall of the liquid seal tank is fixedly installed with inner and outer chamber outer wall coils, a cooling collection plate is arranged inside the liquid seal tank, the right bottom of the liquid seal tank is connected with an outer chamber outlet of the liquid seal tank, and the bottom of the liquid seal tank is connected with an inner chamber outlet of the liquid seal tank.

[0008] Preferably, the liquid sealing tank is divided into an inner chamber and an outer chamber, the outer chamber is open, and the outer chamber is provided with a slot for installing a cooling collection plate. The open outer chamber is provided to facilitate cleaning of the outer chamber and the cooling collection plate.

[0009] Preferably, the cooling collection plate is composed of multiple collection plates, and an internal flow channel of the collection plate is arranged inside the cooling collection plate, and the internal flow channel of the collection plate is for the cooling medium to flow. The upper ends of several collection plates are connected on both sides to form a whole. The cooling medium flows into the cooling collection plate from the connected part on one side of the cooling collection plate and flows out from the other side of the cooling collection plate. Baffles are arranged between the collection plates.

[0010] Preferably, a scraper connecting rod is provided above the liquid seal groove, a scraper is fixedly connected to the lower end of the scraper connecting rod, and a copper wire brush is provided below the scraper. After the scraper is provided to cause the precipitate to agglomerate, the copper wire brush further cleans the surface of the collecting plate. At the same time, a small amount of precipitate remains on the surface of the collecting plate, providing crystal nuclei for the precipitation of the precipitate and promoting the formation of large particles.

[0011] Preferably, a single-piece collecting plate is provided inside the liquid sealing groove, a scraper connecting rod ring is provided on the outside of the scraper connecting rod, and a scraper fixing device is provided above the scraper.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a polyester liquid seal tank cooling and slag removal device, which has the following beneficial effects:

[0014] 1. The utility model reduces the temperature of the solution in the liquid sealing tank stage, promotes the precipitation of the precipitate therein, reduces the pollution rate of the plate heat exchanger, flow meter, etc. on the spray pipeline, increases the use time, and reduces the number of hot washes of the spray pipeline.

[0015] 2. The outer chamber of the horizontal liquid seal tank of the utility model is designed to be open, which is convenient for cleaning the collecting plate and the outer chamber. If the collecting plate leaks, it can be directly lifted out of the outer chamber for maintenance, which is convenient and quick.

[0016] 3. The utility model is provided with a scraper, which can scrape the sediment attached to the collection plate into large particles by moving the scraper up and down. First, the surface of the collection plate is cleaned to ensure the cooling effect, and second, the sediment is squeezed into agglomerates through the extrusion of the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the specific structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the cooling collection plate of the utility model.

[0020] In the figure: 1. Liquid inlet pipe of liquid seal tank; 2. Liquid seal tank; 3. Inner and outer chamber partitions; 4. Inner and outer chamber outer wall coil; 5. Cooling collection plate; 6. Internal flow channel of collection plate; 7. Outlet of outer chamber of liquid seal tank; 8. Outlet of inner chamber of liquid seal tank; 9. Scraper connecting rod; 10. Scraper; 11. Copper wire brush; 12. Single-piece collection plate; 13. Scraper connecting rod ring; 14. Scraper fixing device. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example 1

[0023] like Figure 1-Figure 2 As shown, the utility model provides a polyester liquid seal tank cooling and slag removal device, including a liquid seal tank 2, a liquid seal tank liquid inlet pipe 1 is arranged on the top of the liquid seal tank 2, an inner and outer chamber partition 3 is fixedly connected to the inner wall of the liquid seal tank 2, an inner and outer chamber outer wall coil 4 is fixedly installed on the outer wall of the liquid seal tank 2, a cooling collection plate 5 is arranged inside the liquid seal tank 2, a liquid seal tank outer chamber outlet 7 is arranged on the right bottom of the liquid seal tank 2, and a liquid seal tank inner chamber outlet 8 is arranged on the bottom of the liquid seal tank 2.

[0024] Specifically, the liquid sealing tank 2 is divided into an inner chamber and an outer chamber. The outer chamber is open and is provided with a slot for installing the cooling collection plate 5. The open outer chamber is convenient for cleaning the outer chamber and the cooling collection plate 5.

[0025] Specifically, the cooling collection plate 5 is composed of multiple collection plates, and an internal collection plate flow channel 6 is arranged inside the cooling collection plate 5. The internal collection plate flow channel 6 is for the cooling medium to flow. The upper ends of several collection plates are connected on both sides to form a whole. The cooling medium flows into the cooling collection plate 5 from the connected part on one side and flows out from the other side of the cooling collection plate 5. Baffles are arranged between the collection plates.

[0026] Specifically, a scraper connecting rod 9 is arranged above the liquid sealing groove 2, and a scraper 10 is fixedly connected to the lower end of the scraper connecting rod 9. A copper wire brush 11 is arranged below the scraper 10. After the scraper 10 is arranged to cause the precipitate to agglomerate, the copper wire brush 11 further cleans the surface of the collecting plate. At the same time, a small amount of precipitate remains on the surface of the collecting plate, which provides a crystal nucleus for the precipitation of the precipitate and promotes the formation of large particles.

[0027] Specifically, a single-piece collecting plate 12 is disposed inside the liquid seal groove 2, a scraper connecting rod ring 13 is disposed outside the scraper connecting rod 9, and a scraper fixing device 14 is disposed above the scraper 10. The scraper fixing device 14 is a common component in the industry, so it is not described in detail in the present utility model.

[0028] In this embodiment, the solution enters the inner chamber of the liquid sealing tank 2 through the liquid sealing tank inlet pipe 1. The inner chamber is provided with a partition to prevent a large amount of solution from impacting and causing serious clogging of the basket filter at the outlet of the liquid sealing tank 2. Large particles of precipitate remain in the inner chamber, which can be cleaned by regular slag discharge. At the same time, the inner and outer outer wall coils 4 are arranged on the inner and outer outer wall to initially cool the solution. The cooled solution overflows to the outer chamber through the partition and flows through the cooling collection plate 5 for further cooling. A partition is arranged in the middle of the collecting plate to reduce the flow rate of the solution and increase the residence time. The cooling medium and the solution adopt convection to increase the cooling effect. The cooling collection plate 5 is of inserted type and can be directly lifted out of the liquid sealing tank 2 when it needs maintenance. A scraper 10 is arranged in the middle of each collecting plate. The scraper 10 can move up and down to scrape the precipitate attached to the collecting plate into large particles. One is to clean the surface of the collecting plate to ensure the cooling effect, and the other is to squeeze the scraper to cause the precipitate to form a mass or piece. The large particles of precipitate scraped off flow out of the liquid sealing tank 2 along with the ethylene glycol and are collected by the basket filter arranged at the outlet.

[0029] The working principle of the polyester liquid seal tank cooling and slag removal device is described in detail below.

[0030] like Figure 1-Figure 2 As shown, the liquid seal tank 2 of the three-stage spray system is horizontal, and is divided into an inner and outer chamber by a partition in the middle. Six circles of DN50 inner and outer chamber coils 4 are arranged on the inner and outer chamber walls, and 8°C chilled water is introduced. At present, the ethylene glycol coming from the lower liquid pipe can be reduced from 55°C to 50°C. At the same time, a small amount of oligomers will adhere to the tank wall, and large particles of oligomers will also sink to the bottom of the inner chamber. Ethylene glycol overflows to the outer chamber through the middle partition. 18 collecting plates are arranged in the outer chamber, and each collecting plate is provided with a chilled water flow channel. A baffle is arranged on the surface of each collecting plate, which staggers to slow down the flow rate of ethylene glycol and increases the attachment area. A scraper 10 is arranged between the two collecting plates, which can brush off the attachments to form large particles. After the ethylene glycol is cooled by the collecting plate (from 50°C to 40°C) and gathered, it is exported to the basket filter through the liquid seal tank 2 outlet and collected by the basket filter. The cooled ethylene glycol no longer needs to be cooled by the traditional plate heat exchanger and can be directly used for spraying.

Claims

1. A polyester liquid seal tank cooling and slag removal device, characterized in that: It includes a liquid sealing groove, the upper part of which is connected to a liquid sealing groove liquid inlet pipe, the inner wall of the liquid sealing groove is fixedly connected to inner and outer chamber partitions, the outer wall of the liquid sealing groove is fixedly installed with inner and outer chamber outer wall coils, the interior of the liquid sealing groove is provided with a cooling collection plate, and the right bottom of the liquid sealing groove is connected to an outer chamber outlet of the liquid sealing groove.

2. A polyester liquid seal tank cooling and slag removal device according to claim 1, characterized in that: The bottom of the liquid sealing groove is connected to the inner chamber outlet of the liquid sealing groove.

3. A polyester liquid seal tank cooling and slag removal device according to claim 2, characterized in that: The liquid seal tank is divided into an inner chamber and an outer chamber, the outer chamber is open, and the outer chamber is provided with a slot for installing a cooling collection plate.

4. A polyester liquid seal tank cooling and slag removal device according to claim 3, characterized in that: The cooling collection plate is composed of a plurality of collection plates, and an internal flow channel of the collection plate is arranged inside the cooling collection plate, and the internal flow channel of the collection plate is used for the cooling medium to flow.

5. A polyester liquid seal tank cooling and slag removal device according to claim 4, characterized in that: The upper ends of the plurality of collecting plates are connected at both sides to form a whole, the cooling medium flows in from the connected part on one side of the cooling collecting plate and flows out from the other side of the cooling collecting plate, and baffles are arranged between the collecting plates.

6. A polyester liquid seal tank cooling and slag removal device according to claim 5, characterized in that: A scraper connecting rod is arranged above the liquid sealing groove, and a scraper is fixedly connected to the lower end of the scraper connecting rod.

7. A polyester liquid seal tank cooling and slag removal device according to claim 6, characterized in that: A copper wire brush is arranged below the scraper.

8. A polyester liquid seal tank cooling and slag removal device according to claim 7, characterized in that: A single-piece collecting plate is arranged inside the liquid sealing tank.

9. A polyester liquid seal tank cooling and slag removal device according to claim 8, characterized in that: A scraper connecting rod collar is arranged on the outer side of the scraper connecting rod.

10. A polyester liquid seal tank cooling and slag removal device according to claim 9, characterized in that: A scraper fixing device is arranged above the scraper.

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