Online hot cleaning device for double pipelines and pipelines of ethylene glycol three-stage spraying system of polyester production vacuum system

Abstract

The utility model relates to the technical field of polyester production, and discloses a polyester production vacuum system ethylene glycol three-stage spraying system double-pipeline and pipeline online hot cleaning device which comprises a first-stage spraying tower connected to a second-stage spraying tower through a second-stage vacuum ejector. The second-stage spray tower is connected to the third-stage spray tower through a third-stage vacuum ejector, a spray port of the first-stage spray tower is respectively communicated with an A-side pipeline and a B-side pipeline through pipelines, and the A-side pipeline and the B-side pipeline are connected to a pump A and a pump B through pipelines. The device is additionally provided with a group of spraying pipeline adding pipelines, when the spraying flow of the on-line side pipeline is reduced, the on-line side pipeline can be switched to the standby side to perform long-time hot cleaning on the original on-line side pipeline so as to ensure that the pipeline is completely cleaned in place, and the standby side can be subjected to hot cleaning by designing the heating pipeline, so that the pipeline can be thoroughly cleaned, vacuum fluctuation is not caused, and the service life of the pipeline is prolonged. And meanwhile, the actual production is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production, in particular to a double-pipeline and pipeline online hot cleaning device for a three-stage ethylene glycol spraying system of a polyester production vacuum system. Background Art

[0002] Polyester is an important class of polymer compounds, and its molecular structure contains a large number of ester bonds. Ester bonds are chemical bonds formed by the acid-alcohol condensation reaction between carboxylic acid and alcohol molecules. Polyester can be prepared by polymerization, usually by polycondensation of monomers containing carboxyl and hydroxyl functional groups. Polyester has many excellent physical and chemical properties, so it is widely used in industry and daily life. In the production process of polyester, the reaction tail gas needs to be treated with ethylene glycol spray.

[0003] However, the three-stage ethylene glycol spraying system of the polyester production vacuum system is only designed for single-line spraying. The precipitated polymers of ethylene glycol adhere to the pipe wall and nozzle. Due to long-term accumulation, the diameter of the pipe and nozzle becomes smaller and smaller. When it reaches a certain level, the ethylene glycol spraying flow rate cannot meet the actual production requirements, resulting in insufficient vacuum capacity, affecting actual production. In serious cases, the production needs to be stopped for cleaning. The later design adds hot ethylene glycol flushing, which can meet certain hot washing requirements, but it is easy to cause vacuum fluctuations, and the pipeline is difficult to clean thoroughly. For this reason, we proposed a dual-line and online pipeline hot cleaning device for the three-stage ethylene glycol spraying system of the polyester production vacuum system. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the utility model provides a double-pipeline and pipeline online hot cleaning device for a three-stage ethylene glycol spraying system of a polyester production vacuum system.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a polyester production vacuum system ethylene glycol three-stage spray system double pipeline and pipeline online hot cleaning device, including a first-stage spray tower, the first-stage spray tower is connected to the second-stage spray tower through a second-stage vacuum ejector, the second-stage spray tower is connected to the third-stage spray tower through a third-stage vacuum ejector, the spray port of the first-stage spray tower is connected to the A-side pipeline and the B-side pipeline respectively through pipelines, and the A-side pipeline and the B-side pipeline are connected to the A pump and the B pump through pipelines. The inlets of the A pump and the B pump are connected to the A side filter and the B side filter through pipes, and the inlets of the A side filter and the B side filter are connected to the ethylene glycol sealed tank through pipes, and the ethylene glycol sealed tank is respectively connected to the lower liquid pipelines of the first-stage spray tower, the second-stage spray tower and the third-stage spray tower through pipes, and the spray outlet pipeline of the first-stage spray tower is connected to the overflow tank through a pipe, and a sight glass is provided on the overflow tank. The bottom outlet of the overflow tank is connected to a heat medium jacket heating pipeline through a pipe, a heat medium inlet pipe is provided on one side of the heat medium jacket heating pipeline, and a heat medium return pipe is provided on the other side of the heat medium jacket heating pipeline.

[0008] Preferably, valve one, valve two, valve three and valve four are provided on the pipeline between the primary spray tower and the A-side pipeline, the B-side pipeline and the overflow tank.

[0009] Preferably, valve five, valve six, valve seven and valve eight are provided on the pipeline between the first-stage spray tower and pump A and pump B.

[0010] Preferably, valve 11 and valve 12 are provided on the pipeline between the secondary spray tower and pump A and pump B, and valve 9 and valve 10 are provided on the pipeline between the tertiary spray tower and pump A and pump B.

[0011] Preferably, valve 13, valve 14, valve 15 and valve 16 are provided on the pipelines between the A-side pipeline and the B-side pipeline and the A pump and the B pump.

[0012] Preferably, valve 17, valve 18, valve 19 and valve 20 are provided on the pipelines on both sides of the A-side filter and the B-side filter.

[0013] Preferably, valve 21, valve 22 and valve 23 are provided on the pipeline between the heat medium jacket heating pipeline and the ethylene glycol sealing tank.

[0014] Preferably, a valve 24 is provided on the pipe of the liquid inlet of the ethylene glycol sealed tank, a valve 25 is provided on the pipe of the liquid discharge port of the secondary spray tower, and a valve 26 is provided on the pipe of the liquid discharge port of the tertiary spray tower.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a double-pipeline and pipeline online hot cleaning device for a three-stage ethylene glycol spraying system in a polyester production vacuum system, which has the following beneficial effects:

[0017] 1. The utility model adds a group of spray pipelines and adds pipelines. When the spray flow rate of the online side pipeline becomes smaller, it can be switched to the standby side to perform long-term hot cleaning on the original online side pipeline to ensure that all pipelines are cleaned in place.

[0018] 2. The utility model can heat-wash the spare side by designing a heating pipeline, so that the pipeline can be thoroughly cleaned without causing vacuum fluctuations and affecting actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 It is a schematic diagram of the process structure of the utility model.

[0021] In the figure: 1, valve one; 2, valve two; 3, valve three; 4, valve four; 5, valve five; 6, valve six; 7, valve seven; 8, valve eight; 9, valve nine; 10, valve ten; 11, valve eleven; 12, valve twelve; 13, valve thirteen; 14, valve fourteen; 15, valve fifteen; 16, valve sixteen; 17, valve seventeen; 18, valve eighteen; 19, valve nineteen; 20, valve twenty; 21, valve twenty-one; 22, valve twenty-two ; 23. Valve twenty-three; 24. Valve twenty-four; 25. Valve twenty-five; 26. Valve twenty-six; 27. Primary spray tower; 28. Secondary spray tower; 29. ​​Third-stage spray tower; 30. Overflow tank; 31. Sight glass; 32. Heat medium jacket heating pipeline; 33. Heat medium inlet pipe; 34. Heat medium return pipe; 35. A side pipeline; 36. B side pipeline; 37. A pump; 38. B pump; 39. A side filter; 40. B side filter; 41. Ethylene glycol sealing tank. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] like Figure 1As shown, the utility model provides a double pipeline and pipeline online hot cleaning device for a three-stage ethylene glycol spraying system of a polyester production vacuum system, including a primary spray tower 27, the primary spray tower 27 is connected to a secondary spray tower 28 through a secondary vacuum ejector, the secondary spray tower 28 is connected to a third-stage spray tower 29 through a third-stage vacuum ejector, the spray port of the primary spray tower 27 is respectively connected to an A-side pipeline 35 and a B-side pipeline 36 through pipelines, the A-side pipeline 35 and the B-side pipeline 36 are connected to an A pump 37 and a B pump 38 through pipelines, the inlets of the A pump 37 and the B pump 38 are connected through pipelines and are provided with an A-side filter 39 and a B-side filter 40. The inlets of the A-side filter 39 and the B-side filter 40 are connected to the ethylene glycol sealed tank 41 through pipelines, and the ethylene glycol sealed tank 41 is connected to the lower liquid pipelines of the first-stage spray tower 27, the second-stage spray tower 28 and the third-stage spray tower 29 through pipelines respectively. The spray outlet pipeline of the first-stage spray tower 27 is connected to the overflow tank 30 through a pipeline, and a sight glass 31 is provided on the overflow tank 30. The bottom outlet of the lower end of the overflow tank 30 is connected to a heat medium jacket heating pipeline 32 through a pipeline, and a heat medium inlet pipe 33 is provided on one side of the heat medium jacket heating pipeline 32, and a heat medium return pipe 34 is provided on the other side of the heat medium jacket heating pipeline 32.

[0025] Valve one 1, valve two 2, valve three 3 and valve four 4 are arranged on the pipeline between the primary spray tower 27 and the A-side pipeline 35, the B-side pipeline 36 and the overflow tank 30.

[0026] The pipeline between the first-stage spray tower 27 and the A pump 37 and the B pump 38 is provided with valve five 5, valve six 6, valve seven 7 and valve eight 8.

[0027] A valve eleven 11 and a valve twelve 12 are provided on the pipeline between the secondary spray tower 28 and the A pump 37 and the B pump 38, and a valve nine 9 and a valve ten 10 are provided on the pipeline between the tertiary spray tower 29 and the A pump 37 and the B pump 38.

[0028] The pipelines between the A-side pipeline 35 and the B-side pipeline 36 and the A pump 37 and the B pump 38 are provided with a valve 13, a valve 14, a valve 15 and a valve 16.

[0029] The pipelines on both sides of the A-side filter 39 and the B-side filter 40 are provided with valve 17 17 , valve 18 18 , valve 19 19 and valve 20 .

[0030] A valve twenty-one 21 , a valve twenty-two 22 and a valve twenty-three 23 are provided on the pipeline between the heat medium jacket heating pipeline 32 and the ethylene glycol sealing tank 41 .

[0031] A valve twenty-four 24 is provided on the pipeline of the liquid inlet of the ethylene glycol sealing tank 41, a valve twenty-five 25 is provided on the pipeline of the liquid outlet of the secondary spray tower 28, and a valve twenty-six 26 is provided on the pipeline of the liquid outlet of the tertiary spray tower 29.

[0032] In this embodiment, by adding a group of spray pipelines, when the spray flow of the online side pipeline becomes smaller, it can be switched to the spare side, and the original online side pipeline is hot-cleaned for a long time to ensure that all pipelines are cleaned in place. By designing a heating pipeline, the spare side can be hot-cleaned, so that the pipeline can be thoroughly cleaned without causing vacuum fluctuations and affecting actual production.

[0033] The following is a detailed description of the working principles of the polyester production vacuum system ethylene glycol three-stage spray system double pipeline and pipeline online hot cleaning device.

[0034] like Figure 1 As shown, during normal operation, when pump A 37 is in operation, pipeline A side 35 is used, then valve 2 2, valve 7 7, valve 9 9, valve 11 11, valve 15 15, valve 17 17, valve 18 18, valve 24 24, valve 25 25, valve 26 26 are normally open, valve 1 1, valve 3 3, valve 4 4, valve 5 5, valve 6 6, valve 8 8, valve 10 10, valve 12 12, valve 13 13, valve 14 14, valve 16 1 6. Valve 19, valve 20, valve 21, valve 22, valve 23, valve 23 are normally closed. When it is found that the spray flow of the A-side pipeline 35 is gradually decreasing, and there is no obvious effect after switching the filter or cleaning other equipment of this pipeline, it can be judged that the pipeline has adsorbed more polymers and cannot meet the production demand. At this time, it can be switched to the B-side pipeline 36 to perform hot washing on the A-side pipeline 35. The specific operation is as follows: the original online A-side pipeline 35 is switched to the B-side pipeline 36: Open valve eight 8, valve three 3, valve twenty-three 23 to fill the B side pipeline 36. When the sight glass 31 of the overflow tank 30 overflows, it proves that the pipeline has been filled. According to the actual flow rate, gradually open valve one 1 and close valve two 2 until the switch is completed. Perform hot wash on the A side pipeline 35: open valve twenty-two 22, valve nineteen 19, start the B pump 38, open valve fourteen 14, valve five 5, valve four 4 in sequence. When the sight glass 31 of the overflow tank 30 overflows, open valve twenty-three 23 , close valve twenty-two 22, the self-circulation of pipeline 35 on side A is established, and the heat medium jacket heating pipeline 32 is heated up. When the temperature reaches about 130°C, the pipeline can be thermally cleaned. During the cleaning process, the pump pressure becomes low, which means that the polymers on the pipe wall are entrained into the filter under the action of high temperature. At this time, the filter needs to be disassembled and cleaned. After multiple disassembly and cleaning, if the pump pressure is unstable, it means that the self-circulation system is insufficiently filled with liquid. The above operation needs to be repeated until the pump pressure is stabilized at a higher value for a long time. At this time, the thermal cleaning is completed.

[0035] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A double-pipeline and pipeline online thermal cleaning device for a three-stage ethylene glycol spraying system in a polyester production vacuum system, characterized in that: include: A primary spray tower, wherein the primary spray tower is connected to the secondary spray tower through a secondary vacuum ejector, the secondary spray tower is connected to the tertiary spray tower through a tertiary vacuum ejector, the spray port of the primary spray tower is respectively connected to the A-side pipeline and the B-side pipeline through pipelines, the A-side pipeline and the B-side pipeline are connected to the A pump and the B pump through pipelines, the inlets of the A pump and the B pump are connected through pipelines and are provided with an A-side filter and a B-side filter, the inlets of the A-side filter and the B-side filter are connected to an ethylene glycol sealing tank through pipelines, the ethylene glycol sealing tank is respectively connected to the lower liquid pipelines of the primary spray tower, the secondary spray tower and the tertiary spray tower through pipelines, the spray port pipeline of the primary spray tower is connected to the overflow tank through a pipeline, and a sight glass is provided on the overflow tank.

2. The double-pipeline and pipeline online hot cleaning device of the ethylene glycol three-stage spray system of the polyester production vacuum system according to claim 1 is characterized by: The bottom outlet of the overflow tank is connected to a heat medium jacketed heating pipeline through a pipeline. A heat medium inlet pipe is provided on one side of the heat medium jacketed heating pipeline, and a heat medium return pipe is provided on the other side of the heat medium jacketed heating pipeline.

3. The double-pipeline and pipeline online hot cleaning device of the ethylene glycol three-stage spray system of the polyester production vacuum system according to claim 1 is characterized by: The pipelines between the first-level spray tower and the A-side pipeline, the B-side pipeline and the overflow tank are provided with valve one, valve two, valve three and valve four.

4. The polyester production vacuum system ethylene glycol three-stage spray system double pipeline and pipeline online hot cleaning device according to claim 1, characterized in that: The pipeline between the first-level spray tower and the A pump and the B pump is provided with valve five, valve six, valve seven and valve eight.

5. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 1 is characterized by: The pipeline between the secondary spray tower and the A pump and the B pump is provided with valve 11 and valve 12, and the pipeline between the tertiary spray tower and the A pump and the B pump is provided with valve 9 and valve 10.

6. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 1 is characterized by: The pipelines between the A-side pipeline and the B-side pipeline and the A pump and the B pump are provided with valve 13, valve 14, valve 15 and valve 16.

7. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 1, characterized in that: The pipelines on both sides of the A-side filter and the B-side filter are provided with valves 17, 18, 19 and 20.

8. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 2, characterized in that: The pipeline between the heat medium jacket heating pipeline and the ethylene glycol sealed tank is provided with valve 21, valve 22 and valve 23.

9. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 1, characterized in that: A valve twenty-four is arranged on the pipeline of the liquid inlet of the ethylene glycol sealed tank.

10. The double-pipeline and pipeline online thermal cleaning device for the ethylene glycol three-stage spraying system of the polyester production vacuum system according to claim 1, characterized in that: A valve 25 is provided on the pipeline of the discharge port of the secondary spray tower, and a valve 26 is provided on the pipeline of the discharge port of the tertiary spray tower.

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