CN218981481U - Vacuum system transformation device for polyester production - Google Patents
Vacuum system transformation device for polyester production Download PDFInfo
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- CN218981481U CN218981481U CN202223612473.6U CN202223612473U CN218981481U CN 218981481 U CN218981481 U CN 218981481U CN 202223612473 U CN202223612473 U CN 202223612473U CN 218981481 U CN218981481 U CN 218981481U
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Abstract
The utility model relates to the field of polyester production equipment, in particular to a vacuum system transformation device for polyester production, wherein a tail gas pipe of a first pre-polycondensation reaction kettle is connected to a three-stage spray tail gas pipe through a vacuumizing pipeline, the three-stage spray tail gas pipe is connected to a liquid ring vacuum pump, a tail gas inlet of the liquid ring vacuum pump is connected with a blow-down pipe through a balance pipe, a tail gas outlet of the liquid ring vacuum pump is connected to an ethylene glycol working medium tank through a pipeline, the ethylene glycol working medium tank is connected with the blow-down pipe, an ethylene glycol circulating pipe is arranged between the liquid ring vacuum pump and the ethylene glycol working medium tank, an ethylene glycol adding pipe and an ethylene glycol overflow pipe are arranged on the ethylene glycol working medium tank, and a frequency converter is arranged on a motor of the liquid ring vacuum pump. According to the vacuum system transformation device for polyester production, the first pre-polycondensation reaction kettle and the three-stage spraying device share the same liquid ring vacuum pump, and meanwhile, the required vacuum degree can be met, the energy consumption is reduced, and the energy utilization rate is improved.
Description
Technical Field
The utility model relates to the field of polyester production equipment, in particular to a vacuum system transformation device for polyester production.
Background
At present, the first pre-condensation reaction kettle, the three-stage spraying device and the like are all provided with independent vacuum systems for extracting tail gas generated in the first pre-condensation reaction kettle. However, in the actual working process, the liquid ring vacuum pump often generates larger negative pressure, and the requirements of the first pre-condensation reaction kettle, the three-stage spraying device and the like on the vacuum degree are relatively low, so that the pressure of the liquid ring vacuum pump often has surplus, and external air or self-circulation is needed to keep pressure balance so as to ensure that the internal vacuum degree of the first pre-condensation reaction kettle and the three-stage spraying device meets the requirements.
In the production process, the two liquid ring vacuum pumps normally operate, so that the energy consumption is high, and the energy waste is more.
Therefore, the vacuum system is modified to meet the vacuum degree requirements of the first pre-condensation reaction kettle and the three-stage spraying device, and the energy consumption and the energy waste can be reduced.
Disclosure of Invention
The utility model aims to solve the technical defects and provides a vacuum system transformation device for polyester production, which can meet the vacuum degree requirements of a first pre-polycondensation reaction kettle and a three-stage spraying device, and simultaneously can reduce energy consumption and energy waste.
The utility model discloses a vacuum system reconstruction device for polyester production, which comprises a first pre-condensation reaction kettle tail gas pipe and a three-stage spray tail gas pipe, wherein the first pre-condensation reaction kettle tail gas pipe is connected to the three-stage spray tail gas pipe through a vacuumizing pipeline, the three-stage spray tail gas pipe is connected to a liquid ring vacuum pump, a tail gas inlet of the liquid ring vacuum pump is connected with a blow-down pipe through a balance pipe, a tail gas outlet of the liquid ring vacuum pump is connected to a glycol working medium tank through a pipeline, the glycol working medium tank is connected with the blow-down pipe, a glycol circulating pipe is arranged between the liquid ring vacuum pump and the glycol working medium tank, a glycol adding pipe and a glycol overflow pipe are arranged on the glycol working medium tank, a frequency converter is arranged on a motor of the liquid ring vacuum pump, and the controller is connected with the frequency converter.
The two ends of the vacuumizing pipeline are provided with emergency stop valves, the vacuumizing pipeline close to one end of the tail gas pipe of the first pre-condensation reaction kettle is provided with check valves, the vacuumizing pipeline between the emergency stop valves is provided with a liquid collector, the liquid collector is provided with a liquid discharge pipe, and the liquid discharge pipe is provided with a liquid discharge valve.
A pressure regulating valve is arranged on the vacuumizing pipe at the liquid collector.
The liquid collector is provided with a sight glass for observing the liquid level inside the liquid collector.
The vacuum lines at two ends of the liquid collector are respectively provided with a switching valve, the vacuum lines at the outer sides of the switching valves are connected with standby lines, and the standby lines are provided with bypass valves.
And the tail gas pipe of the first precondensation reaction kettle and the three-stage spray tail gas pipe are respectively provided with a remote transmission pressure gauge, and the remote transmission pressure gauges are connected with the controller.
According to the vacuum system transformation device for polyester production, the first pre-polycondensation reaction kettle and the three-stage spraying device share the same liquid ring vacuum pump, meanwhile, the required vacuum degree can be met, the energy consumption is reduced, a frequency converter is designed for increasing the motor of the liquid ring vacuum pump of the tail gas of the three-stage spraying, and the energy utilization rate is improved.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.
Example 1:
as shown in fig. 1, the utility model discloses a vacuum system reconstruction device for polyester production, which comprises a first pre-polycondensation reaction kettle tail gas pipe 1 and a three-stage spray tail gas pipe 2, wherein the first pre-polycondensation reaction kettle tail gas pipe 1 is connected to the three-stage spray tail gas pipe 2 through a vacuumizing pipeline 3, the three-stage spray tail gas pipe 2 is connected to a liquid ring vacuum pump 4, a tail gas inlet of the liquid ring vacuum pump 4 is connected with a blow-down pipe 5 through a balance pipe 16, a tail gas outlet of the liquid ring vacuum pump 4 is connected to a glycol working medium tank 7 through a pipeline, the glycol working medium tank 7 is connected with the blow-down pipe 5, a glycol circulating pipe 6 is arranged between the liquid ring vacuum pump 4 and the glycol working medium tank 7, a glycol adding pipe 8 and a glycol overflow pipe 9 are arranged on the glycol working medium tank 7, a frequency converter 14 is arranged on a motor 13 of the liquid ring vacuum pump 4, and the controller 15 is connected with the frequency converter 14.
Wherein, a gas supplementing regulating valve 17 is arranged on the balance pipe 16 and is used for regulating the gas supplementing quantity. The heat exchanger 10 is arranged on the glycol circulation pipe 6, the heat exchanger 10 exchanges heat and cools the glycol entering the liquid ring vacuum pump 4 in the glycol working medium tank 7, the heat exchanger 10 is provided with a cooling water inlet pipe 11 and a cooling water outlet pipe 12, and cooling water is adopted to cool the glycol.
The tail gas pipe 1 of the first pre-condensation reaction kettle is connected to the three-stage spray tail gas pipe 2 through the vacuumizing pipeline 3, so that the first pre-condensation reaction kettle is connected with the three-stage spray device in parallel, and a liquid ring vacuum pump 4 is adopted to provide negative pressure for the two devices, so that the original set of vacuum system can be reduced, the cost is reduced, and the energy consumption can be reduced.
The liquid collector 19 is arranged on the vacuumizing pipeline 3, so that water in tail gas generated by the first pre-condensation reaction kettle can be effectively collected, the water can be prevented from entering a vacuum pipeline to influence the vacuum degree, meanwhile, the water can be prevented from entering glycol of the liquid ring vacuum pump 4, the water content of working medium glycol is increased, and the efficiency of the liquid ring vacuum pump 4 is reduced.
A pressure regulating valve 24 is provided on the evacuation line 3 at the liquid trap 19. The design of the pressure regulating valve 24 can be more practical, and the pressure in the vacuumizing pipeline 3 can be regulated to meet the extraction of the tail gas of the first pre-condensation reaction kettle, and meanwhile, the influence on the vacuum degree in the first pre-condensation reaction kettle can be avoided.
A sight glass 23 is provided on the liquid trap 19 for observing the liquid level inside the liquid trap 19. When the liquid level reaches a certain height, the drain valve 22 can be opened to drain the water inside.
The switching valves 20 are arranged on the vacuumizing pipelines 3 at the two ends of the liquid collector 19, a standby pipeline 25 is connected to the vacuumizing pipelines 3 outside the switching valves 20, and a bypass valve 26 is arranged on the standby pipeline 25. If the liquid trap 19 is purged or if a failure occurs, the first precondensation reactor off-gas can be fed through the backup line 25, and the line is switched through the switching valve 20 and the bypass valve 26.
The first pre-condensation reaction kettle tail gas pipe 1 and the third-stage spray tail gas pipe 2 are respectively provided with a remote pressure gauge 27, and the remote pressure gauges 27 are connected with the controller 15.
The remote pressure gauge 27 is connected with the controller 15 through signal transmission, and the controller 15 can be used for detecting the air pressure value according to each remote pressure gauge 27. The liquid ring vacuum 4 is additionally provided with the frequency converter 14, and through the frequency conversion control of the motor, the automatic control of the vacuum pressure of the three-stage spraying system can be realized, the power load of the motor can be reduced, the frequency of the frequency converter 14 is reasonably controlled, and the energy loss is reduced.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be in interaction relationship with two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.
Claims (6)
1. The utility model provides a vacuum system reforms transform device for polyester production, includes first pre-polycondensation reation kettle tail gas pipe and tertiary tail gas pipe that sprays, characterized by: the exhaust pipe of the first pre-condensation reaction kettle is connected to a three-stage spray exhaust pipe through a vacuumizing pipeline, the three-stage spray exhaust pipe is connected to a liquid ring vacuum pump, an exhaust inlet of the liquid ring vacuum pump is connected with a blow-down pipe through a balance pipe, an exhaust outlet of the liquid ring vacuum pump is connected to a glycol working medium tank through a pipeline, the glycol working medium tank is connected with the blow-down pipe, a glycol circulating pipe is arranged between the liquid ring vacuum pump and the glycol working medium tank, a glycol adding pipe and a glycol overflow pipe are arranged on the glycol working medium tank, a frequency converter is arranged on a motor of the liquid ring vacuum pump, and the controller is connected with the frequency converter.
2. The vacuum system reconstruction device for producing polyester according to claim 1, wherein: the two ends of the vacuumizing pipeline are provided with emergency stop valves, the vacuumizing pipeline close to one end of the tail gas pipe of the first pre-condensation reaction kettle is provided with check valves, the vacuumizing pipeline between the emergency stop valves is provided with a liquid collector, the liquid collector is provided with a liquid discharge pipe, and the liquid discharge pipe is provided with a liquid discharge valve.
3. The vacuum system reconstruction device for polyester production according to claim 2, wherein: a pressure regulating valve is arranged on the vacuumizing pipe at the liquid collector.
4. A vacuum system retrofit for polyester production according to claim 3, wherein: the liquid collector is provided with a sight glass for observing the liquid level inside the liquid collector.
5. The vacuum system reconstruction device for polyester production according to claim 2, wherein: the vacuum lines at two ends of the liquid collector are respectively provided with a switching valve, the vacuum lines at the outer sides of the switching valves are connected with standby lines, and the standby lines are provided with bypass valves.
6. The vacuum system reconstruction device for producing polyester according to claim 1, wherein: and the tail gas pipe of the first precondensation reaction kettle and the three-stage spray tail gas pipe are respectively provided with a remote transmission pressure gauge, and the remote transmission pressure gauges are connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223612473.6U CN218981481U (en) | 2022-12-30 | 2022-12-30 | Vacuum system transformation device for polyester production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223612473.6U CN218981481U (en) | 2022-12-30 | 2022-12-30 | Vacuum system transformation device for polyester production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218981481U true CN218981481U (en) | 2023-05-09 |
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ID=86219091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223612473.6U Active CN218981481U (en) | 2022-12-30 | 2022-12-30 | Vacuum system transformation device for polyester production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218981481U (en) |
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2022
- 2022-12-30 CN CN202223612473.6U patent/CN218981481U/en active Active
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