Vacuum washing system for polyester device and working method of vacuum washing system

Abstract

The invention discloses a vacuum washing system for a polyester device and a working method of the vacuum washing system. The vacuum washing system comprises a separator, and the separator comprises an upper sealing head, a barrel and a shell which are connected in sequence; the upper sealing head is externally connected with an inward extending washer; a washing liquid EG outlet is formed in the end, far away from the barrel, of the shell; wherein the washing solution EG outlet is connected with a circulating pump, and the circulating pump can drive washing EG to be recycled; wherein the inward extending washer comprises an EG mixed steam inlet and a washing EG liquid inlet pipe, and washing EG and EG mixed steam flow in parallel in the same direction. The washing system is compact in structure, and cyclic utilization of washing EG can be effectively achieved. In addition, through the design of co-current flow in the same direction, the washing efficiency is improved, and the consumption of raw materials is reduced. The internally-extending washer not only optimizes the washing process, but also realizes efficient cyclic utilization of the washing liquid through cooperation with the circulating pump.

Description

Technical Field

[0001] The invention relates to the field of polyester vacuum systems, in particular to a vacuum washing system for a polyester device and a working method thereof. Background Art

[0002] In the polycondensation stage of the polymerization process, the BHET generated in the esterification process will undergo an intermolecular polycondensation reaction under the catalytic action of high temperature and catalyst, and ethylene glycol (EG) molecules will be removed. In order to increase the degree of polymerization of the product, the generated ethylene glycol must be quickly extracted from the system. For this reason, a spray condenser is usually provided at the gas phase outlet of the polycondensation reactor, and a three-stage steam jet vacuum pump unit is provided in the post-process of the spray condenser. The function of the spray condenser is to condense, collect and recycle the gaseous ethylene glycol. The non-condensable gas carries a small amount of condensable gas and small molecular polymers and flows out from the gas outlet of the spray condenser and enters the three-stage steam jet vacuum pump unit. The small molecular polymers carried by the gas will continue to accumulate on the inner wall of the vacuum pipe, which will lead to the following two situations: 1. The flow rate of the vacuum pipe gradually decreases, and the output of the polymerization device gradually decreases; 2. The small molecular polymers accumulated together fall off as a whole, directly blocking the vacuum pipe or the three-stage steam jet vacuum pump unit, and the polymerization device shuts down.

[0003] For example, a Chinese patent application numbered CN201320765477.X discloses a "reaction kettle spray washing device for polyester resin production", which includes a reaction kettle and a condenser, and also includes a spray tower with an organic solvent placed at the bottom between the reaction kettle and the condenser, the top of the spray tower is connected to the condenser, the middle of the spray tower is connected to the reaction kettle, and the bottom of the spray tower is connected to a suction pump; the liquid outlet pipe of the suction pump is connected to a nozzle, and the nozzle extends into the top of the spray tower; when the gas enters the spray tower, the organic solvent is sucked by the suction pump and then sprayed down through the nozzle to fully mix with the gas to absorb the organic matter in the gas, thereby preventing the organic matter from entering the vacuum pipeline and the condenser, and preventing the pipeline and the condenser from being blocked; further improving the vacuum efficiency of the vacuum pump, effectively reducing the vacuum time, and ensuring the polyester resin production cycle and product performance.

[0004] According to the above scheme combined with the prior art, in order to avoid the above situation, a vacuum scrubber is usually added between the spray condenser and the three-stage steam jet vacuum pump unit. The scrubber usually adopts a vertical cylindrical container, with an EG nozzle on the top of the scrubber and a two-stage umbrella-shaped spray inside the scrubber. The liquid atomization and the capture effect of small molecular polymers are not good; the gas from the spray condenser enters from the bottom of the scrubber and flows through the scrubber and then flows out from the top of the scrubber. Inside the scrubber, EG and gas flow in the opposite direction, increasing the resistance of gas flow. In severe cases, the vacuum degree of the spray condenser will decrease. Summary of the invention

[0005] In view of the problems in the prior art mentioned in the background technology that EG and gas inside the scrubber flow in the opposite direction, increasing the resistance to gas flow, and in severe cases causing a decrease in the vacuum degree of the spray condenser, the present invention proposes a vacuum scrubbing system for a polyester device and a working method thereof, which adopts a method in which EG and gas inside the scrubber flow in the same direction and in parallel, thereby avoiding the increase in resistance caused by the countercurrent and effectively maintaining the vacuum degree of the spray condenser.

[0006] In order to achieve the above-mentioned purpose, a vacuum washing system for a polyester device is disclosed, comprising a separator, the separator comprising an upper head, a cylinder and a shell connected in sequence; the upper head is externally connected to an inwardly extending washer; the shell is provided with a washing liquid EG outlet away from the cylinder end; wherein the washing liquid EG outlet is connected to a circulation pump, and the circulation pump can drive the washing EG to circulate; wherein the inwardly extending washer comprises an EG mixed steam inlet and a washing EG liquid inlet pipe, and the washing EG and the EG mixed steam flow in the same direction and in parallel.

[0007] The washing system is connected to the inner extension scrubber through the upper head, so that the washing EG liquid inlet pipe can introduce the washing liquid into the scrubber and merge with the EG mixed steam. The design of co-current flow is conducive to improving the washing efficiency. Through the full contact between the liquid and the steam, it promotes the capture and carrying of impurities, thereby achieving a more thorough cleaning effect. The setting of the washing liquid EG outlet allows the washed EG to be discharged and recycled, which not only improves the utilization rate of raw materials, but also reduces production costs. Through the design of the inner extension scrubber, the washing EG and the EG mixed steam can be efficiently mixed in a smaller space. This compact layout is conducive to reducing the volume of the equipment and improving the space utilization rate. At the same time, the washing liquid EG outlet is used in conjunction with the circulation pump to form a closed-loop circulation system, ensuring the continuous supply and recycling of the washing liquid, which is more important for maintaining the stability and continuity of the production process. The washing system has a compact structure, is easy to operate, and can effectively realize the recycling of the washing EG. In addition, the design of co-current flow improves the washing efficiency and reduces the consumption of raw materials. The in-line scrubber not only optimizes the washing process, but also realizes the efficient recycling of the washing liquid by cooperating with the circulating pump. And the system can adjust the flow rate of washing EG and the mixing ratio of EG mixed steam according to actual production needs to adapt to different production conditions. In addition, the design of the system allows flexible expansion or reduction to meet the production needs of different scales. The modular design of the system is also convenient for maintenance and upgrading, which improves the reliability and service life of the system.

[0008] Furthermore, the inward-extending scrubber includes a three-way interface, and the straight pipe ends of the three-way interface are respectively provided with a short pipe and a washing EG liquid inlet pipe, and the T-shaped end is the EG mixed steam inlet; the other end of the short pipe is connected to a gradually expanding pipe located inside the separator. The straight pipe ends of the three-way interface are respectively connected to the short pipe and the washing EG liquid inlet pipe, and the T-shaped end serves as the EG mixed steam inlet. This layout helps to achieve the same-direction and parallel flow of the washing EG and the EG mixed steam, thereby improving the washing efficiency. In fact, the design of the three-way interface can centrally control the flow paths of the washing EG and the EG mixed steam, so that the two media can be mixed under optimal conditions, thereby improving the washing efficiency. The short pipe at the straight pipe end is connected to the gradually expanding pipe located inside the separator. This structure helps to form an appropriate flow rate and pressure drop inside the scrubber, thereby optimizing the washing process. In addition, the design of the three-way interface also facilitates the realization of automatic control, thereby improving the reliability and stability of the system.

[0009] Preferably, the inner extension pipe end of the washing EG inlet pipe is provided with a solid conical nozzle, which is connected to the T-shaped end, and the straight pipe end and the T-shaped end are set with equal diameters. The solid conical nozzle allows the washing EG to be sprayed out in the form of atomization at the inner extension pipe end to form fine droplets, which increases the contact area between the washing liquid and the EG mixed steam, thereby improving the mixing efficiency and the washing effect. This design not only optimizes the washing process, but also helps to achieve a more uniform distribution of the washing liquid. The design of the solid conical nozzle can improve the washing efficiency and the overall performance of the system. The improvement of the atomization effect means that the same washing effect can be achieved at a lower washing EG dosage, which helps to reduce the use of raw materials and reduce production costs. At the same time, good mixing efficiency helps to remove impurities more thoroughly and improve product quality. Traditional scrubbers may adopt a simple straight tube or orifice plate structure, which may lead to uneven distribution of the washing liquid and low mixing efficiency. The design of the solid conical nozzle improves this problem through the atomization effect, providing a more uniform and efficient washing.

[0010] In addition, the washing efficiency and system stability can be further improved by adjusting the nozzle geometry, size or material to suit different application requirements, or by integrating sensors and control elements to achieve intelligent control.

[0011] Preferably, the center of the upper head is provided with a center hole externally connected to the inner extension scrubber; the cylinder is provided with a gas outlet near the upper head. The connection between the center hole of the upper head and the inner extension scrubber not only provides a passage for the washing EG to enter the scrubber, but also ensures the stability of the structure and the continuity of the washing process by fixing the scrubber to the top of the separator. At the same time, the gas outlet design of the cylinder near the upper head helps to discharge the uncondensed gas generated during the washing process in time and maintain the pressure balance inside the scrubber. At the same time, the introduction of the washing EG and the discharge of the uncondensed gas can be effectively realized, thereby optimizing the washing process. In many traditional designs, the introduction of the washing EG and the discharge of the gas may require additional pipes and connectors, which not only increases the complexity of the system, but also may cause energy loss and reduced efficiency. This design improves the integration and operation efficiency of the system by simplifying the connection method. This solution organically combines the fixation of the scrubber and the introduction of the washing EG with the discharge of the gas, and realizes multiple functions through a center hole, which improves the structural stability while simplifying the complexity of the system. In addition, the pore size or shape can be adjusted to meet different flow requirements, or intelligent control can be achieved by integrating sensors and control elements to further improve washing efficiency and system stability.

[0012] Preferably, a cyclone plate dewatering device is provided in the separator, and the cyclone plate dewatering device includes a cover tube and a cyclone blade arranged in the cover tube, and the cyclone blade is evenly arranged in an inclined posture in the cover tube. The cyclone blades are evenly arranged in an inclined posture in the cover tube, so that the washed liquid generates a rotational motion when passing through the cyclone plate, thereby realizing the centrifugal separation of the liquid. And the rotation effect helps to accelerate the separation process of the liquid and solid or gas impurities, and improve the washing efficiency. The inclined arrangement of the cyclone blades can effectively increase the centrifugal force of the liquid, promote the separation of the liquid and impurities, and maintain the fluid dynamic balance inside the washing system. This design reduces the residence time of the liquid inside the scrubber, reduces energy consumption, and improves the purification efficiency of the washing liquid. Traditional scrubbers may use straight blades or lack an effective separation mechanism, which may lead to low washing efficiency and residual impurities in the washing liquid. The design of the cyclone plate improves the separation efficiency and reduces the energy consumption during the washing process by increasing the centrifugal force. In addition, the uniform arrangement of the cyclone blades ensures the consistency of the liquid flow inside the scrubber and avoids excessive wear or blockage in local areas. Those skilled in the art can further adapt to different washing requirements by adjusting the angle, length or material of the swirl blades, or realize real-time monitoring and regulation of the washing process by integrating sensors and control elements.

[0013] Furthermore, the cyclone plate dewatering device includes a support ring plate abutting the shell, and the support ring plate is evenly provided with tear holes; the outer ring of the cover tube cooperates with the inner wall of the shell to form a liquid receiving groove. The cyclone plate dewatering device is connected to the shell of the scrubber through the support ring plate, and the tear holes evenly provided on the support ring plate allow the washing liquid to pass through and collect in the liquid receiving groove during the separation process. The outer ring of the cover tube cooperates with the inner wall of the shell to form a liquid receiving groove with the support ring plate. Such a design helps to effectively collect and discharge the washed liquid, avoid the liquid from being retained or refluxed inside the scrubber, and ensure the continuity and efficiency of the washing process. Through the tear hole design on the support ring plate, the discharge path of the washing liquid can be optimized, the dead zone and retention inside the scrubber can be reduced, and the washing efficiency can be improved. At the same time, the design of the liquid receiving groove helps to collect the washed liquid, which is convenient for subsequent treatment or recycling. Traditional scrubbers may have the problem of poor washing liquid discharge, resulting in reduced washing efficiency or secondary pollution of the washing liquid. The design of the support ring plate and tear holes effectively avoids these problems by providing a uniform discharge path. In addition, the setting of the liquid receiving tank facilitates the collection of washing liquid, further improving the integration and operational convenience of the washing system.

[0014] In this solution, the size, shape or distribution of the tear holes can be adjusted to adapt to different flow rates and viscosities of the washing liquid, or the corrosion resistance and wear resistance of the support ring plate can be improved by using special materials or coatings.

[0015] Preferably, a cross-shaped anti-vortex baffle is provided inside the shell near the outlet of the washing liquid EG. The cross-shaped anti-vortex baffle is located inside the shell near the outlet of the washing liquid EG, and its structural design helps to destroy the vortex that may be formed and promote the smooth flow of the liquid. Through this design, the residence time of the liquid at the outlet can be reduced, and the pressure loss caused by the vortex can be reduced, thereby improving the efficiency of the washing system. The cross-shaped anti-vortex baffle can effectively solve the vortex problem and improve the discharge efficiency of the washing liquid. The presence of vortexes will reduce the performance of the scrubber, and through a reasonably designed anti-vortex baffle, the smooth discharge of the washing liquid can be ensured and the energy loss of the system can be reduced.

[0016] Preferably, the washing EG liquid inlet pipe is arranged concentrically with the short pipe and the gradually diverging pipe. The concentric arrangement of the washing EG liquid inlet pipe, the short pipe and the gradually diverging pipe means that these components are concentrically aligned in space, and such a configuration helps the smooth flow of the washing EG, EG mixed steam and uncondensed gas in the scrubber. The concentric arrangement reduces the resistance in the fluid flow and reduces the pressure loss of the system, thereby improving the washing efficiency and overall performance. The concentric arrangement design can optimize the fluid dynamic conditions and improve the fluidity inside the scrubber. By reducing the turbulence and eddy currents of the fluid inside the scrubber, energy consumption can be reduced and the washing efficiency can be improved, while also helping to reduce the dead zone and potential impurity accumulation in the system. By adopting the design of the concentric arrangement, the washing EG liquid inlet pipe, the short pipe and the gradually diverging pipe can work together more efficiently to achieve the optimization of the washing process.

[0017] Preferably, a coarse filter is provided between the outlet of the washing liquid EG and the circulation pump, and a fine filter is provided between the circulation pump and the washing EG inlet pipe; a cooler is provided at the front end of the washing EG inlet pipe. The coarse filter is located between the outlet of the washing liquid EG and the circulation pump, and its function is to remove large particle impurities in the washing liquid to prevent the circulation pump and subsequent equipment from being worn or blocked. The fine filter is arranged between the circulation pump and the washing EG inlet pipe to further filter tiny particles, ensure the cleanliness of the washing liquid, and improve the washing effect. The front-end cooler is used to reduce the temperature of the washing liquid, which is crucial for controlling the thermodynamic conditions in the washing process and preventing the equipment from overheating. Through the combination of coarse filtration, fine filtration and cooling, the washing system can achieve efficient management and optimization of the washing liquid. After the washing liquid is double filtered by coarse filtration and fine filtration, it can maintain a high degree of cleanliness, thereby more effectively removing impurities during the washing process. The application of the cooler helps to control the temperature of the washing liquid and prevent the vacuum degree from being reduced and the capture efficiency from being reduced due to excessively high temperature.

[0018] The present application also discloses a working method of the vacuum washing system for the polyester device, including but not limited to the following steps: i. The EG mixed steam enters the internal extension scrubber through the EG mixed steam inlet of the internal extension scrubber; ii. The washing EG enters the inner extension scrubber through the washing EG inlet pipe and mixes with the EG mixed steam; iii. The washing EG and the EG mixed steam flow in the same direction in the inner extension scrubber to capture and remove impurities; iv. The gas and liquid are separated inside the separator, and the uncondensed gas is discharged through the gas outlet; v. Washing EG is discharged through the washing EG outlet and recycled after filtering, pressurization and cooling.

[0019] The method first introduces EG mixed steam through the EG mixed steam inlet of the inner extension scrubber, and then the washing EG enters the inner extension scrubber through the washing EG liquid inlet pipe and mixes with the EG mixed steam. The washing EG and the EG mixed steam flow in the same direction in the inner extension scrubber, which is conducive to the capture and removal of impurities. Subsequently, the gas and liquid are separated inside the separator, the uncondensed gas is discharged through the gas outlet, and the washing EG is discharged through the washing EG outlet. This method can ensure the continuity and efficiency of the washing process. The design of the same direction and parallel flow allows the washing EG and the EG mixed steam to be fully mixed, thereby improving the washing effect. The design of gas-liquid separation ensures the timely discharge of uncondensed gas, thereby avoiding the influence on the washing effect. Through this method, the washing EG can capture and remove impurities more effectively, thereby improving the washing efficiency. At the same time, the recycling of the washing EG reduces the consumption of raw materials and the generation of waste, thereby meeting the requirements of environmental protection and sustainable development.

[0020] Furthermore, by adjusting the ratio of the washing EG and the EG mixed steam, the washing efficiency can be optimized and improved.

[0021] Therefore, the present invention has the following beneficial effects: The washing EG and EG mixed steam adopt the same direction and parallel flow design, which are fully mixed in the scrubber, effectively prolonging the contact time, improving the impurity capture efficiency and enhancing the washing effect.

[0022] The solid conical nozzle arranged in the internal extension scrubber atomizes the scrubbing EG, increases the gas-liquid contact area, promotes condensation and capture, and reduces energy consumption.

[0023] The washing EG is filtered through coarse and fine filters at multiple stages, as well as the temperature of the cooler, which ensures the cleanliness of the washing liquid and the appropriate working temperature, thus extending the service life of the equipment.

[0024] The outlet of the washing EG is equipped with a cross-shaped anti-vortex baffle, which reduces the formation of vortex, optimizes the gas-liquid separation efficiency, reduces system resistance and reduces energy loss.

[0025] The recycling of washing liquid EG reduces the demand for fresh detergent, reduces the consumption of raw materials, reduces production costs, and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the layout of this system.

[0027] Figure 2 This is a schematic diagram of the structure of this system.

[0028] Figure 3 It is a schematic diagram of the structure of the inward-extending scrubber in the invention.

[0029] Figure 4 Schematic diagram of the structure of the cyclone plate dehumidifier in the present invention.

[0030] Figure 5 for Figure 4 Side view of the medium cyclone plate dehumidifier.

[0031] In the figure: 1—Separator 1.1—Upper head 1.2—Cylinder 1.3—Housing 1.4—Center hole 1.5—Gas outlet 1.6—Anti-vortex baffle 1.7—Washing liquid EG outlet 2—Inner extension scrubber 2.1—Three-way interface 2.2—Short tube 2.3—EG liquid inlet pipe 2.4—Gradually expanding tube 2.5—Solid cone nozzle 2.6—EG mixed steam inlet 3—Swirl plate dehumidifier 3.1—Hood 3.2—Swirl Blades 3.3—Support ring plate 3.4—Tear pores 4—Washing EG collection tank 5—Coarse filter 6—Circulation pump 7—fine filter 8—Cooler DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1 like Figure 1 , 2 As shown, a vacuum washing system for a polyester device includes a separator 1, and the separator includes an upper head 1.1, a barrel 1.2 and a shell 1.3 connected in sequence; the upper head is externally connected to an inwardly extending washer 2; the shell is provided with a washing liquid EG outlet 1.7 away from the barrel end; wherein the washing liquid EG outlet is connected to a circulation pump, and the circulation pump can drive the washing EG to circulate; wherein the inwardly extending washer includes an EG mixed steam inlet 2.6 and a washing EG liquid inlet pipe, and the washing EG and the EG mixed steam flow in the same direction and in parallel.

[0034] like Figure 3As shown, the inward extension scrubber includes a three-way interface 2.1, and the straight pipe end of the three-way interface is respectively provided with a short pipe 2.2 and a washing EG liquid inlet pipe 2.3, and the T-shaped end is the EG mixed steam inlet; the other end of the short pipe is connected to a gradually expanding pipe 2.4 located inside the separator. The inward extension pipe end of the washing EG liquid inlet pipe is provided with a solid conical nozzle 2.5, and the solid conical nozzle 2.5 is connected to the T-shaped end, and the straight pipe end and the T-shaped end are set with equal diameters.

[0035] The washing system is connected to the inner extension scrubber through the upper head, so that the washing EG liquid inlet pipe can introduce the washing liquid into the scrubber and merge with the EG mixed steam. The design of co-current flow is conducive to improving the washing efficiency. Through the full contact between the liquid and the steam, the dissolution and carrying of impurities are promoted, thereby achieving a more thorough cleaning effect. The setting of the washing liquid EG outlet allows the washed EG to be discharged and recycled, which not only improves the utilization rate of raw materials, but also reduces production costs. Through the design of the inner extension scrubber, the washing EG and the EG mixed steam can be efficiently mixed in a smaller space. This compact layout is conducive to reducing the volume of the equipment and improving the space utilization rate. At the same time, the washing liquid EG outlet is used in conjunction with the circulation pump to form a closed-loop circulation system, ensuring the continuous supply and recycling of the washing liquid, which is more important for maintaining the stability and continuity of the production process. The washing system has a compact structure, is easy to operate, and can effectively realize the recycling of the washing EG. In addition, the design of co-current flow improves the washing efficiency and reduces the consumption of raw materials, which is of great significance for reducing production costs and improving economic benefits. The in-line scrubber not only optimizes the washing process, but also realizes the efficient recycling of the washing liquid by cooperating with the circulating pump. And the system can adjust the flow rate of washing EG and the mixing ratio of EG mixed steam according to actual production needs to adapt to different production conditions. In addition, the design of the system allows flexible expansion or reduction to meet the production needs of different scales. The modular design of the system is also convenient for maintenance and upgrading, which improves the reliability and service life of the system.

[0036] The straight pipe end of the three-way interface is connected to the short pipe and the washing EG inlet pipe respectively, while the T-shaped end serves as the EG mixed steam inlet. This layout helps to achieve the same-direction and parallel flow of the washing EG and the EG mixed steam, thereby improving the washing efficiency. In fact, the design of the three-way interface can centrally control the flow path of the washing EG and the EG mixed steam, so that the two media can be mixed under optimal conditions, thereby improving the washing efficiency. The short pipe at the straight pipe end is connected to the diverging pipe located inside the separator. This structure helps to form an appropriate flow rate and pressure drop inside the scrubber, optimizing the washing process. In addition, the design of the three-way interface also facilitates automatic control, improving the reliability and stability of the system.

[0037] The solid cone nozzle 2.5 allows the washing EG to be sprayed out in the form of atomization at the end of the inner extension tube to form fine droplets, which increases the contact area between the washing liquid and the EG mixed steam, thereby improving the mixing efficiency and washing effect. This design not only optimizes the washing process, but also helps to achieve a more uniform distribution of the washing liquid. The design of the solid cone nozzle can improve the washing efficiency and the overall performance of the system. The improvement in the atomization effect means that the same washing effect can be achieved with a lower amount of washing EG, which helps to reduce the use of raw materials and reduce production costs. At the same time, good mixing efficiency helps to remove impurities more thoroughly and improve product quality. Traditional scrubbers may use a simple straight tube or orifice plate structure, which may lead to uneven distribution of the washing liquid and low mixing efficiency. The design of the solid cone nozzle improves this problem through the atomization effect, providing more uniform and efficient washing.

[0038] In this embodiment, the center of the upper head is provided with a center hole 1.4 externally connected to the inward-extending scrubber; the cylinder is provided with a gas outlet 1.5 near the upper head. The connection between the center hole of the upper head and the inward-extending scrubber not only provides a passage for the washing EG to enter the scrubber, but also ensures the stability of the structure and the continuity of the washing process by fixing the scrubber to the top of the separator. At the same time, the gas outlet design of the cylinder near the upper head helps to discharge the uncondensed gas generated during the washing process in time and maintain the pressure balance inside the scrubber. At the same time, the introduction of the washing EG and the discharge of the uncondensed gas can be effectively realized, thereby optimizing the washing process. In many traditional designs, the introduction of the washing EG and the discharge of the gas may require additional pipes and connectors, which not only increases the complexity of the system, but also may cause energy loss and reduced efficiency. This design improves the integration and operation efficiency of the system by simplifying the connection method. This solution organically combines the fixation of the scrubber and the introduction of the washing EG with the discharge of the gas, and realizes multiple functions through a center hole, which improves the structural stability while simplifying the complexity of the system. In addition, the pore size or shape can be adjusted to meet different flow requirements, or intelligent control can be achieved by integrating sensors and control elements to further improve washing efficiency and system stability.

[0039] A cross-shaped anti-vortex baffle 1.6 is provided inside the shell near the outlet of the washing liquid EG. The cross-shaped anti-vortex baffle is located inside the shell near the outlet of the washing liquid EG, and its structural design helps to destroy the vortex that may be formed and promote the smooth flow of the liquid. Through this design, the retention time of the liquid at the outlet can be reduced, and the pressure loss caused by the vortex can be reduced, thereby improving the efficiency of the washing system. The cross-shaped anti-vortex baffle can effectively solve the vortex problem and improve the discharge efficiency of the washing liquid. The presence of vortex will reduce the performance of the scrubber, and through a reasonably designed anti-vortex baffle, the smooth discharge of the washing liquid can be ensured and the energy loss of the system can be reduced.

[0040] The washing EG inlet pipe is arranged concentrically with the short pipe and the gradually diverging pipe. The concentric arrangement of the washing EG inlet pipe, the short pipe and the gradually diverging pipe means that these components are concentrically aligned in space, and such a configuration helps the washing EG, EG mixed steam and uncondensed gas to flow smoothly in the scrubber. The concentric arrangement reduces the resistance in the fluid flow and reduces the pressure loss of the system, thereby improving the washing efficiency and overall performance. The concentric arrangement design can optimize the fluid dynamic conditions and improve the fluidity inside the scrubber. By reducing the turbulence and eddy currents of the fluid inside the scrubber, energy consumption can be reduced and the washing efficiency can be improved, while also helping to reduce dead zones and potential impurity accumulation in the system. By adopting a concentric arrangement design, the washing EG inlet pipe, the short pipe and the gradually diverging pipe can work together more efficiently to optimize the washing process.

[0041] It is worth noting that Figure 4 , 5 As shown, the separator is provided with a cyclone plate dehumidifier 3, which includes a cover tube 3.1 and cyclone blades 3.2 arranged in the cover tube, and the cyclone blades are evenly arranged in an inclined posture in the cover tube. The cyclone plate dehumidifier includes a support ring plate 3.3 abutting against the shell, and the support ring plate is evenly provided with tear holes 3.4; the outer ring of the cover tube and the inner wall of the shell cooperate with the support ring plate to form a liquid receiving groove.

[0042] The swirl blades are evenly arranged in an inclined posture in the cover tube, so that the washed liquid generates a rotational motion when passing through the swirl plate, thereby realizing the centrifugal separation of the liquid. And the rotation effect helps to accelerate the separation process of the liquid from solid or gas impurities and improve the washing efficiency. The inclined arrangement of the swirl blades can effectively increase the centrifugal force of the liquid, promote the separation of the liquid and impurities, and maintain the fluid dynamic balance inside the washing system. This design reduces the residence time of the liquid inside the scrubber, reduces energy consumption, and improves the purification efficiency of the washing liquid. Traditional scrubbers may use straight blades or lack an effective separation mechanism, which may lead to low washing efficiency and residual impurities in the washing liquid. The design of the swirl plate increases the separation efficiency and reduces the energy consumption during the washing process by increasing the centrifugal force. In addition, the uniform arrangement of the swirl blades ensures the consistency of the liquid flow inside the scrubber and avoids excessive wear or blockage in local areas. Those skilled in the art can further adjust the angle, length or material of the swirl blades to adapt to different washing needs, or integrate sensors and control elements to achieve real-time monitoring and regulation of the washing process.

[0043] The cyclone plate dehumidifier is connected to the scrubber housing through a support ring plate. The evenly arranged tear holes on the support ring plate allow the washing liquid to pass through and collect in the liquid receiving tank during the separation process. The outer ring of the cover tube and the inner wall of the housing cooperate with the support ring plate to form a liquid receiving tank. This design helps to effectively collect and discharge the washed liquid, avoid the liquid from being retained or refluxed inside the scrubber, and ensure the continuity and efficiency of the washing process. Through the tear hole design on the support ring plate, the discharge path of the washing liquid can be optimized, the dead zone and retention inside the scrubber can be reduced, and the washing efficiency can be improved. At the same time, the design of the liquid receiving tank helps to collect the washed liquid for subsequent treatment or recycling. Traditional scrubbers may have problems with poor washing liquid discharge, resulting in reduced washing efficiency or secondary contamination of the washing liquid. The design of the support ring plate and tear holes effectively avoids these problems by providing a uniform discharge path. In addition, the setting of the liquid receiving tank facilitates the collection of washing liquid, further improving the integration and operation convenience of the washing system. Those skilled in the art may also adjust the size, shape or distribution of the tear holes to adapt to different flow rates and viscosities of the washing liquid, or improve the corrosion resistance and wear resistance of the support ring plate by using special materials or coatings.

[0044] The core of the vacuum washing system for polyester equipment is to efficiently capture and remove impurities in the process, while realizing the recycling of washing liquid. The system consists of key components such as separator, internal extension washer, cyclone plate dehumidifier, etc. The mutual coordination and precise connection between them ensure the efficient operation of the whole system.

[0045] As a vertical cylindrical container, the separator has a structural design including an upper head, a cylinder and a conical shell, which is conducive to the efficient gas-liquid separation process. The upper head adopts an elliptical head structure with a center hole in the center and an externally extended scrubber. This design is conducive to the uniform distribution and full mixing of the scrubbing liquid EG. The cylinder part is provided with a gas outlet, from which the uncondensed gas is discharged, and the small head end of the conical shell is provided with a scrubbing liquid EG outlet, from which the washed EG is discharged for subsequent treatment.

[0046] The inner extension scrubber includes EG mixed steam inlet, washing EG liquid inlet pipe, solid conical nozzle and other components. The inner extension pipe end of the washing EG liquid inlet pipe is provided with a solid conical nozzle. This design enables the washing EG to form an atomization effect when sprayed, increases the contact area with the EG mixed steam, and improves the washing efficiency. The setting of the three-way interface allows the washing EG and the EG mixed steam to be effectively mixed in the process of co-flow.

[0047] The design of the cyclone plate dehumidifier further optimizes the separation effect of gas and liquid. The cyclone blades are evenly arranged in an inclined posture in the hood, so that the gas forms a rotating flow when passing through, promoting the centrifugal separation of droplets and improving the separation efficiency. The tear holes set on the support ring plate allow the separated droplets to enter the receiving tank and be discharged, keeping the system clean and operating efficiency.

[0048] During the entire washing process, the co-current design of washing EG and EG mixed steam is the key to improving washing efficiency. After the washing EG flows through the solid cone nozzle, it mixes with the EG mixed steam and flows in the same direction, which not only prolongs the contact time, but also increases the chance of capturing impurities. After washing in the scrubber and separation in the separator, the uncondensed gas is discharged through the gas outlet, while the washed EG is discharged through the washing EG outlet and recycled after filtration, pressurization, cooling and other treatments, achieving resource conservation and environmental protection.

[0049] The washing system disclosed in this embodiment has the characteristics of high efficiency, energy saving and environmental protection. The use of co-current design and solid conical nozzle improves washing efficiency and reduces energy consumption. The design of multi-stage filtration and cooling links ensures the cleanliness and suitable working temperature of the washing liquid, and prolongs the service life of the equipment. The recycling of washing liquid reduces the consumption of raw materials, reduces production costs, and reduces environmental pollution.

[0050] Example 2 In this embodiment, a working method of the vacuum washing system for the polyester device in Embodiment 1 is disclosed, including but not limited to the following steps: i. EG mixed steam enters the internal extension scrubber through the EG mixed steam inlet of the internal extension scrubber; ii. The washing EG enters the inner extension scrubber through the washing EG inlet pipe and mixes with the EG mixed steam; iii. The washing EG and the EG mixed steam flow in the same direction in the inner extension scrubber to capture and remove impurities; iv. The gas and liquid are separated inside the separator, and the uncondensed gas is discharged through the gas outlet; v. Washing EG is discharged through the washing EG outlet and recycled after filtering, pressurization and cooling.

[0051] In this system, a coarse filter 5 is provided between the outlet of the washing liquid EG and the circulation pump 6, and a fine filter 7 is provided between the circulation pump 6 and the washing EG inlet pipe; a cooler 8 is provided at the front end of the washing EG inlet pipe. The coarse filter is located between the outlet of the washing liquid EG and the circulation pump, and is used to remove large particle impurities in the washing liquid to prevent the circulation pump and subsequent equipment from being worn or blocked. The fine filter is arranged between the circulation pump and the washing EG inlet pipe to further filter tiny particles, ensure the cleanliness of the washing liquid, and improve the washing effect. The front-end cooler is used to reduce the temperature of the washing liquid, which is crucial for controlling the thermodynamic conditions in the washing process and preventing the equipment from overheating. Through the combination of coarse filtration, fine filtration and cooling, the washing system can achieve efficient management and optimization of the washing liquid. After the double filtration of coarse filtration and fine filtration, the washing liquid can maintain a high degree of cleanliness, thereby more effectively removing impurities during the washing process. The application of the cooler helps to control the temperature of the washing liquid to prevent the vacuum degree from being reduced and the capture efficiency from being reduced due to excessive temperature.

[0052] The method first introduces EG mixed steam through the EG mixed steam inlet of the inner extension scrubber, and then the washing EG enters the inner extension scrubber through the washing EG liquid inlet pipe and mixes with the EG mixed steam. The washing EG and the EG mixed steam flow in the same direction in the inner extension scrubber, which is conducive to the capture and removal of impurities. Subsequently, the gas and liquid are separated inside the separator, the uncondensed gas is discharged through the gas outlet, and the washing EG is discharged through the washing EG outlet. This method can ensure the continuity and efficiency of the washing process. The design of the same direction and parallel flow allows the washing EG and the EG mixed steam to be fully mixed, thereby improving the washing effect. The design of gas-liquid separation ensures the timely discharge of uncondensed gas, thereby avoiding the influence on the washing effect. Through this method, the washing EG can capture and remove impurities more effectively, thereby improving the washing efficiency. At the same time, the recycling of the washing EG reduces the consumption of raw materials and the generation of waste, thereby meeting the requirements of environmental protection and sustainable development.

[0053] The operation process of the vacuum washing system for polyester devices starts from the system startup. The operator needs to ensure that all connections are firm, the valve status is correct, and the instrument and sensor are calibrated so that the required data can be accurately read during operation. Subsequently, the EG mixed steam inlet valve is opened to allow the EG mixed steam from the spray condenser to flow into the scrubber 2. The steam enters the scrubber 2 through the inlet 2.6, and starts the washing EG circulation pump synchronously, so that the washing EG flows from the storage tank into the washing EG liquid inlet pipe 2.3, and is sprayed out through the solid cone nozzle 2.5, and contacts the EG mixed steam in the form of efficient atomization. The design of co-current and parallel flow allows the washing EG to evenly cover the EG mixed steam, thereby improving the washing efficiency. After passing through the diffuser 2.4, the washed mixed gas enters the separator 1. The design of the cyclone plate dehumidifier 3 allows the droplets in the gas to be separated by centrifugal force and deposited on the inner wall of the cylinder 1.2. The deposited droplets then flow along the wall into the washing EG outlet 1.7 at the bottom of the separator, and then flow into the washing EG collection tank 4. In the collection tank 4, the washed EG first passes through the coarse filter 5 to remove impurities, and then is pressurized by the circulation pump 6 to ensure that the flow rate and pressure meet the requirements. The pressurized washed EG flows through the fine filter 7 to further remove impurities, and then is cooled by the cooler 8 to control the temperature to avoid overheating affecting the washing effect. The cooled washed EG flows back to the washing EG inlet pipe 2.3 to complete the recycling process.

[0054] Throughout the entire process, operators need to pay attention to monitoring the key parameters of the system to ensure the continuity and stability of operation, while regularly inspecting and maintaining key components to improve the reliability and efficiency of system operation.

[0055] Example 3 In this embodiment, the technical solution of the system can be further refined, using different types of nozzles to achieve better atomization effects, or using different swirl blade designs to improve the separation efficiency of droplets. In addition, it is possible to consider using an intelligent control system to monitor and adjust various parameters in the washing process to achieve higher automation and optimize operating conditions. The application of new materials or coating technologies can also improve the corrosion resistance and wear resistance of the equipment and extend its service life.

Claims

1. A vacuum washing system for a polyester device, characterized in that: It includes a separator, which includes an upper head, a cylinder and a shell connected in sequence; the upper head is externally connected to an inner extension type washer; the shell is provided with a washing liquid EG outlet at the end away from the cylinder; Wherein, the washing liquid EG outlet is connected to a circulation pump, and the circulation pump can drive the washing EG to be circulated; Wherein, the inwardly extending scrubber comprises an EG mixed steam inlet and a washing EG liquid inlet pipe, and the washing EG and the EG mixed steam flow in the same direction and in parallel.

2. The vacuum cleaning system for polyester equipment according to claim 1, characterized in that: The inward-extending scrubber includes a three-way interface, the straight pipe ends of the three-way interface are respectively provided with a short pipe and a washing EG liquid inlet pipe, and the T-shaped end is the EG mixed steam inlet; the other end of the short pipe is connected to a gradually expanding pipe located inside the separator.

3. The vacuum cleaning system for polyester equipment according to claim 2, characterized in that: A solid conical nozzle is provided at the inner extension pipe end of the washing EG liquid inlet pipe, and the solid conical nozzle is connected to the T-shaped end, and the straight pipe end and the T-shaped end are arranged with equal diameters.

4. The vacuum cleaning system for polyester equipment according to claim 2, characterized in that: The center of the upper head is provided with a center hole externally connected to the inner extension type scrubber; the cylinder is provided with a gas outlet near the upper head.

5. The vacuum cleaning system for polyester equipment according to claim 2, characterized in that: A cyclone plate dehumidifier is arranged in the separator. The cyclone plate dehumidifier comprises a cover tube and cyclone blades arranged in the cover tube. The cyclone blades are evenly arranged in an inclined posture in the cover tube.

6. The vacuum cleaning system for polyester equipment according to claim 5, characterized in that: The cyclone plate dewatering device comprises a supporting ring plate abutting against a shell, and tear holes are evenly arranged on the supporting ring plate; the outer ring of the cover tube and the inner wall of the shell cooperate with the supporting ring plate to form a liquid receiving groove.

7. The vacuum cleaning system for polyester equipment according to claim 1, characterized in that: A cross-shaped anti-eddy current baffle is provided inside the shell near the outlet of the washing liquid EG.

8. The vacuum cleaning system for polyester equipment according to claim 2, characterized in that: The washing EG liquid inlet pipe is arranged concentrically with the short pipe and the gradually expanding pipe.

9. The vacuum cleaning system for a polyester device according to any one of independent claims 1 to 8, characterized in that: A coarse filter is arranged between the outlet of the washing liquid EG and the circulation pump, and a fine filter is arranged between the circulation pump and the washing EG inlet pipe; a cooler is arranged at the front end of the washing EG inlet pipe.

10. A method for operating a vacuum washing system for a polyester device according to any one of claims 1 to 9, characterized in that: Including but not limited to the following steps: S1: EG mixed steam enters the internal extension scrubber through the EG mixed steam inlet of the internal extension scrubber; S2: The scrubbing EG enters the inboard scrubber through the scrubbing EG liquid inlet pipe and mixes with the EG mixed steam; S3: The washing EG and the EG mixed steam flow in the same direction in the inner extension scrubber to capture and remove impurities; S4: Gas and liquid are separated inside the separator, and uncondensed gas is discharged through the gas outlet; S5: The washed EG is discharged through the washed EG outlet and recycled after filtering, pressurization and cooling.

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