A multi-basket filter for polyester production without disassembly and cleaning and a cleaning method thereof

Abstract

The present invention discloses a multi-basket filter for polyester production that does not require disassembly and cleaning, and a cleaning method, aiming to solve the problem that the multi-basket filter for polyester production needs to be disassembled for cleaning, which is inconvenient to operate and has low work efficiency. The invention includes a mounting cylinder, a plurality of filter baskets installed in the mounting cylinder, a support baffle installed at the lower position of the mounting cylinder, the support baffle divides the interior of the mounting cylinder into a liquid inlet chamber and a liquid outlet chamber, the filter basket is installed on the support baffle, a liquid inlet is arranged at the lower end of the filter basket, and the liquid inlet is connected to the liquid inlet chamber; a plurality of flushing nozzles arranged toward the filter basket are installed in the liquid inlet chamber, the mounting cylinder is connected to a flushing pipe, and the flushing nozzles are all connected to the flushing pipe; the mounting cylinder is provided with an EG inlet and an EG drain port connected to the liquid inlet chamber, and the mounting cylinder is provided with an EG outlet, a compressed air inlet, and a vent port connected to the liquid outlet chamber. The multi-basket filter achieves non-disassembly and cleaning, is easy to operate, and improves work efficiency.

Description

Technical Field

[0001] The invention relates to a polyester production device, and more particularly to a multi-basket filter for polyester production which does not require disassembly and cleaning, and a cleaning method. Background Art

[0002] Ethylene glycol (EG) is the main raw material for polyester production. All EG produced in the production process is recycled and reused to reduce raw material consumption. In the production device using the three-reactor process technology, it is necessary to inject excess EG into the pre-condensation reactor. EG vaporizes in the reactor and forms bubbles under vacuum conditions, which enhances heat transfer and reaction. The EG generated by the reaction and the injected excess EG enter the spray condenser for condensation and recycling.

[0003] The EG generated by the pre-polycondensation reaction carries a large amount of granular oligomer impurities. Filters are usually used to remove the oligomer particles, with a filtration accuracy of 20 mesh (corresponding to an impurity particle size of 0.8 mm). Two filters are usually configured, one for use and one for backup. The filter is usually a vertical straight-through positive filter type, multi-basket type, usually with a filter diameter of ≥800 mm, and about 10 filter baskets are installed.

[0004] Usually, according to the filter operation time, the filter basket of the offline filter is switched and cleaned regularly. To clean the filter basket, the upper head, connecting flange and fastening bolts need to be removed, and the filter baskets need to be cleaned one by one. After the filter basket is cleaned, the filter basket, upper head and connecting flange need to be reinstalled. The upper head and connecting flange are heavy and inconvenient to disassemble and assemble. The fastening bolts of the upper head and connecting flange are large in diameter and large in number, so disassembly and assembly are time-consuming and labor-intensive, and inefficient. After several disassemblies and assemblies, the fastening bolts are bitten or reversed. After several disassemblies and assemblies, the sealing gasket fails and there is a risk of leakage. Moreover, after the filter basket is blocked, the weight increases and it is difficult to disassemble, especially the filter basket near the center. Every time it is disassembled and assembled, ethylene glycol (EG) leaks into the water, which not only increases the consumption of raw materials, but also generates a large amount of wastewater. Every time it is cleaned, the filter basket is deformed and damaged, which increases the workload and loss of the filter basket repair. The disassembly and assembly time is long, generally more than 2 hours, and the work efficiency is low. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention provides a multi-basket filter and a cleaning method for polyester production, which realizes disassembly-free cleaning, reduces workload, reduces damage to fasteners, gaskets, and flanges caused by improper disassembly and assembly, reduces the generation of waste water during the cleaning process, improves cleaning efficiency, shortens cleaning time, and reduces loss to the filter basket.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a multi-basket filter for polyester production that does not require disassembly and cleaning, comprising a mounting cylinder, a plurality of filter baskets installed in the mounting cylinder, a supporting partition installed at the lower position of the mounting cylinder, the supporting partition divides the interior of the mounting cylinder into a liquid inlet chamber and a liquid outlet chamber, the filter basket is installed on the supporting partition, a liquid inlet is arranged at the lower end of the filter basket, and the liquid inlet is connected to the liquid inlet chamber; a plurality of flushing nozzles arranged toward the filter basket are installed in the liquid inlet chamber, the mounting cylinder is connected to a flushing pipe, and the flushing nozzles are all connected to the flushing pipe; the mounting cylinder is provided with an EG inlet and an EG drain port connected to the liquid inlet chamber, and the mounting cylinder is provided with an EG outlet, a compressed air inlet, and a vent port connected to the liquid outlet chamber.

[0007] When the multi-basket filter is working, the EG liquid enters the liquid inlet cavity through the EG inlet, and enters the filter basket from the liquid inlet of the filter basket, enters the liquid outlet cavity after being filtered by the filter basket, and finally is discharged from the EG outlet. When the multi-basket filter is blocked, the cleaning procedure is started to clean the filter. The cleaning includes the following steps: S1, close the EG inlet, then close the EG outlet, at this time the vent and EG drain ports are closed; S2, open the compressed air inlet, pressurize the EG inside the installation cylinder; S3, open the EG drain port, use the compressed air pressure to reduce the driving force generated by the volume expansion, and reversely flush the filter basket; S4, after the EG is drained, close the compressed air inlet and the EG drain port; S5, start the EG flushing pump, and the EG flushing pump inputs EG flushing liquid into the flushing pipe; S6, when EG emerges from the vent, turn off the EG flushing pump; S7, repeat S1 to S6; S8, after the cleaning is completed, turn on the EG flushing pump, fill the installation cylinder with liquid until EG emerges from the vent; turn off the EG flushing pump.

[0008] High-pressure air and EG are used to flush the filter basket. After the high-pressure air is passed into the installation cylinder, the EG first impacts the filter basket in reverse to clean the filter basket, and then the high-pressure air impacts the filter basket to clean the filter basket, completing the reverse cleaning. The EG flushing liquid impacts the filter basket for forward cleaning. Through multiple forward and reverse cleaning, the cleaning effect is good. Directly using EG liquid for cleaning instead of traditional water flow cleaning avoids the generation of sewage, and the EG cleaning liquid can be recycled. The entire cleaning process does not require the installation cylinder to be opened and the filter basket to be taken out for cleaning, and the cleaning operation is convenient.

[0009] The multi-basket filter achieves disassembly-free cleaning, which reduces workload and reduces damage to fasteners, gaskets, and flanges caused by improper disassembly and assembly. It reduces the generation of wastewater during the cleaning process, improves cleaning efficiency, shortens cleaning time, and reduces wear on the filter basket.

[0010] Preferably, the flushing nozzle is a spiral nozzle, which has a wide spray range, a large impact force, and a good flushing effect on the filter basket.

[0011] As a preferred embodiment, a short pipe is connected between the flushing nozzle and the flushing pipe, and a pipe clamp is connected between the short pipe and the flushing nozzle. The flushing nozzle is easy and reliable to install.

[0012] As a preferred embodiment, a three-way joint is installed at the lower part of the installation tube, one end of the three-way joint is connected to the installation tube, and the other two ends serve as the EG inlet and the EG drain outlet, respectively. The three-way joint facilitates the layout of the EG inlet and the EG drain outlet.

[0013] Preferably, a plurality of through-holes are provided on the support partition and on the filter basket in a one-to-one correspondence, the liquid inlet is connected to the through-holes in correspondence, a fixing ear is provided on the edge of the through-hole on the support partition, a slot is formed between the fixing ear and the support partition, a positioning ring is connected to the lower end of the filter basket, and the edge of the positioning ring is stuck in the slot. When the filter basket is installed, the positioning ring is stuck in the slot, the connection is reliable, and the disassembly and assembly are convenient.

[0014] Preferably, a handle is connected to the upper end of the filter basket, and the provision of the handle facilitates the disassembly, assembly and movement of the filter basket.

[0015] Preferably, a plurality of flushing pipes are arranged, each of which is connected to an extension pipe, which extends to the outside of the installation tube. A plurality of support rods are installed at the bottom of the installation tube, and the flushing pipes are fastened to the support rods.

[0016] The flushing pressure is ensured by laying out multiple flushing pipes, thereby ensuring the flushing effect on the filter basket.

[0017] Preferably, the installation cylinder comprises a cylinder body, a bottom head and a top head, the bottom head is welded to the bottom of the cylinder body, an upper flange is arranged at the lower end of the top head, a lower flange is arranged at the upper end of the cylinder body, and the upper flange and the lower flange are tightly connected. The installation cylinder is convenient and reliable to connect and assemble, and has good reliability after connection.

[0018] Preferably, a moving rod and a plurality of cleaning rings spaced apart up and down are installed in the filter basket, the cleaning rings are connected to the moving rod, a piston cylinder is provided in the installation cylinder and corresponding to the compressed air inlet, one end of the piston cylinder is connected to the compressed air inlet, a piston is installed in the piston cylinder, a piston rod is connected to the piston, a positioning spring is installed between the piston and the piston cylinder, the moving rods are connected to the piston rod, and an air outlet is provided on the side wall of the piston cylinder.

[0019] When the compressed air inlet is opened to pressurize the EG inside the installation cylinder, the high-pressure airflow pushes the piston to move, and then the piston rod pushes the moving rod downward, and the cleaning ring connected to the moving rod cleans the residue on the inner wall of the filter basket. When the compressed air inlet is closed, the piston is pushed by the positioning spring to return the cleaning ring, and the residue on the inner wall of the filter basket is scraped and cleaned. This structural setting greatly improves the cleaning effect of the filter basket.

[0020] A filter cleaning method is used to clean a multi-basket filter for polyester production, which does not require disassembly and cleaning, and comprises the following steps:

[0021] S1, close the EG inlet, then close the EG outlet, at this time the vent and EG drain outlet are closed;

[0022] S2, open the compressed air inlet to pressurize the EG inside the installation cylinder;

[0023] S3, open the EG drain port, use the compressed air pressure to reduce the driving force generated by volume expansion, and reversely flush the filter basket;

[0024] S4, after EG is exhausted, close the compressed air inlet and EG exhaust port;

[0025] S5, start the EG flushing pump, and the EG flushing pump inputs EG flushing liquid into the flushing pipe;

[0026] S6, when EG comes out from the vent, turn off the EG flushing pump;

[0027] S7, repeat S1 to S6;

[0028] S8. After cleaning, turn on the EG flushing pump and fill the installation cylinder with liquid until EG comes out of the vent; then turn off the EG flushing pump.

[0029] High-pressure air and EG are used to flush the filter basket. After the high-pressure air is passed into the installation cylinder, the EG first impacts the filter basket in reverse to clean the filter basket, and then the high-pressure air impacts the filter basket to clean the filter basket, completing the reverse cleaning. The EG flushing liquid impacts the filter basket for forward cleaning. Through multiple forward and reverse cleaning, the cleaning effect is good. Directly using EG liquid for cleaning instead of traditional water flow cleaning avoids the generation of sewage, and the EG cleaning liquid can be recycled. The entire cleaning process does not require the installation cylinder to be opened and the filter basket to be taken out for cleaning, and the cleaning operation is convenient.

[0030] Compared with the prior art, the beneficial effects of the present invention are: (1) the multi-basket filter can be cleaned without disassembly, which reduces the workload and the damage to fasteners, gaskets and flanges caused by improper disassembly and assembly, reduces the generation of waste water during the cleaning process, improves the cleaning efficiency, shortens the cleaning time and reduces the loss of the filter basket; (2) the multi-basket filter has a good cleaning effect through multiple forward cleaning and reverse cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0032] Figure 2 is a top view of Example 1 of the present invention after the top head is removed;

[0033] Figure 3 The present invention Figure 1Enlarged view of the D position in the middle;

[0034] Figure 4 It is a structural schematic diagram of the positioning ring of the present invention;

[0035] Figure 5 is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0036] Figure 6 The present invention Figure 5 A magnified view of the middle I position;

[0037] In the figure: 1, installation cylinder, 2, filter basket, 3, support foot, 4, support baffle, 5, liquid inlet chamber, 6, liquid outlet chamber, 7, liquid inlet, 8, flushing nozzle, 9, flushing pipe, 10, EG inlet, 11, EG drain port, 12, EG outlet, 13, compressed air inlet, 14, vent port, 15, tee joint, 16, short pipe, 17, pipe clamp, 18, extension pipe, 19, support rod, 20, flow Hole, 21, fixing ear, 22, slot, 23, positioning ring, 24, avoidance notch, 25, positioning pin, 26, lifting handle, 27, cylinder, 28, bottom head, 29, top head, 30, upper flange, 31, lower flange, 32, moving rod, 33, cleaning ring, 34, piston cylinder, 35, piston, 36, piston rod, 37, positioning spring, 38, air outlet, 39, lifting frame, 40, end cover. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0039] Example 1: A multi-basket filter for polyester production that does not require disassembly and cleaning (see attached Figure 1 To Attachment Figure 4), including a mounting tube 1, a plurality of filter baskets 2 mounted in the mounting tube, the mounting tube is a cylindrical structure, a plurality of legs 3 are connected to the lower part of the mounting tube, and the legs support the mounting tube. A support baffle 4 is installed at the lower part of the mounting tube, and the support baffle divides the interior of the mounting tube into a liquid inlet chamber 5 and a liquid outlet chamber 6. The filter basket is installed on the support baffle, and a liquid inlet 7 is arranged at the lower end of the filter basket, and the liquid inlet is connected to the liquid inlet chamber; a plurality of flushing nozzles 8 arranged toward the filter basket are installed in the liquid inlet chamber, and each filter basket is correspondingly provided with a flushing nozzle, and the mounting tube is connected to a flushing pipe 9, and the flushing nozzles are all connected to the flushing pipe; an EG inlet 10 and an EG drain port 11 connected to the liquid inlet chamber are provided on the mounting tube, and an EG outlet 12 connected to the liquid outlet chamber, a compressed air inlet 13, and a vent 14 are provided on the mounting tube. Valves are connected to the EG inlet, the EG drain port, the EG outlet, the compressed air inlet, and the vent. A three-way joint 15 is installed at the lower part of the mounting tube, one end of the three-way joint is connected to the mounting tube, and the other two ends serve as the EG inlet and the EG drain port respectively. The tee joint is an equal diameter tee. The EG inlet and EG outlet are led out through the tee joint, so that the liquid inlet pipe no longer occupies the internal space of the filter. The filter volume of the same filter area is smaller, the investment is lower, and the installation height can be reduced.

[0040] The flushing nozzle is a spiral nozzle. The jet angle of the spiral nozzle is 60 degrees. The spiral nozzle is located at the center of the filter basket inlet section, ensuring that each filter basket corresponds to a spiral nozzle, and the top of the spiral nozzle is flush with the filter basket inlet section, so that the filter basket is flushed in all directions without dead angles.

[0041] A short pipe 16 is connected between the flushing nozzle and the flushing pipe, and a pipe clamp 17 is connected between the short pipe and the flushing nozzle. Several flushing pipes are arranged, each flushing pipe is connected to an extension pipe 18, and the extension pipe extends to the outside of the installation cylinder. Several support rods 19 are installed at the bottom of the installation cylinder, and the flushing pipes are fastened to the support rods. Two circles of filter baskets are arranged in the installation cylinder, and several baskets are evenly arranged in each circle. There are three flushing pipes, two arc-shaped ones and one annular one. The annular flushing pipe is placed between the two arc-shaped flushing pipes.

[0042] A plurality of flow holes 20 are provided on the support baffle and on the filter basket in correspondence, and the liquid inlet is connected to the flow holes in correspondence. A fixing ear 21 is provided on the edge of the flow hole on the support baffle, and the fixing ear is in an inverted L-shaped structure. A slot 22 is formed between the fixing ear and the support baffle. A positioning ring 23 is connected to the lower end of the filter basket, and the edge of the positioning ring is stuck in the slot. An avoidance notch 24 is provided on the edge of the positioning ring for avoiding the fixing ear, and a positioning pin 25 is connected to the positioning ring. After the avoidance notch on the positioning ring is aligned with the fixing ear and inserted downward, the filter basket is turned to a certain angle so that the positioning pin rests on the side of the fixing ear, and the connection and installation of the filter basket and the support baffle are completed. The filter basket is installed vertically, and a lifting handle 26 is connected to the upper end of the filter basket. A plurality of filter holes are densely distributed on the side wall of the filter basket.

[0043] The installation cylinder includes a cylinder body 27, a bottom seal 28, and a top seal 29. The bottom seal is welded to the bottom of the cylinder body, an upper flange 30 is provided at the lower end of the top seal, and a lower flange 31 is provided at the upper end of the cylinder body. The upper flange and the lower flange are tightly connected. A three-way joint is connected to the bottom seal, a compressed air inlet and a vent are provided on the top seal, and an EG outlet is provided on the cylinder body.

[0044] A filter cleaning method is used to clean a multi-basket filter for polyester production, which does not require disassembly and cleaning, and comprises the following steps:

[0045] S1, close the EG inlet, then close the EG outlet, at this time the vent and EG drain outlet are closed;

[0046] S2, open the compressed air inlet to pressurize the EG inside the installation cylinder;

[0047] S3, open the EG drain port, use the compressed air pressure to reduce the driving force generated by volume expansion, and reversely flush the filter basket;

[0048] S4, after EG is exhausted, close the compressed air inlet and EG exhaust port;

[0049] S5, start the EG flushing pump, and the EG flushing pump inputs EG flushing liquid into the flushing pipe;

[0050] S6, when EG comes out from the vent, turn off the EG flushing pump;

[0051] S7, repeat S1 to S6;

[0052] S8. After cleaning, turn on the EG flushing pump and fill the installation cylinder with liquid until EG comes out of the vent; then turn off the EG flushing pump.

[0053] High-pressure air and EG are used to flush the filter basket. After the high-pressure air is passed into the installation cylinder, the EG first impacts the filter basket in reverse to clean the filter basket, and then the high-pressure air impacts the filter basket to clean the filter basket, completing the reverse cleaning. The EG flushing liquid impacts the filter basket for forward cleaning. Through multiple forward and reverse cleaning, the cleaning effect is good. Directly using EG liquid for cleaning instead of traditional water flow cleaning avoids the generation of sewage, and the EG cleaning liquid can be recycled. The entire cleaning process does not require the installation cylinder to be opened and the filter basket to be taken out for cleaning, and the cleaning operation is convenient.

[0054] Example 2: A multi-basket filter for polyester production that does not require disassembly and cleaning (see attached Figure 5 , Attachment Figure 6), its structure is similar to that of Example 1, the main difference is that in this embodiment, a moving rod 32 and a plurality of cleaning rings 33 spaced apart are installed in the filter basket, the cleaning rings are all connected to the moving rod, a piston cylinder 34 is provided in the installation cylinder and in correspondence with the compressed air inlet, one end of the piston cylinder is connected to the compressed air inlet, a piston 35 is installed in the piston cylinder, a piston rod 36 is connected to the piston, a positioning spring 37 is installed between the piston and the piston cylinder, the moving rods are all connected to the piston rod, and an air outlet 38 is provided on the side wall of the piston cylinder. The lower end of the piston rod is connected to a lifting frame 39, the upper ends of the moving rods are all connected to the lifting frame, a step surface is provided at the top of the piston cylinder, the piston seal abuts on the step surface, and the air outlet is provided at the lower position of the piston cylinder. The lower end of the piston cylinder is connected to an end cover 40, the piston rod extends downward from the end cover, and the positioning spring abuts between the end cover and the piston. The outer wall of the cleaning ring is adapted to the inner wall of the filter basket, and the cleaning ring and the moving rod are connected together by connecting ribs. The other structures are the same as those of Example 1.

[0055] When the compressed air inlet is opened in step S2 to pressurize the EG inside the installation cylinder, the high-pressure airflow pushes the piston to move, and then the piston rod pushes the moving rod to move downward, and the cleaning ring connected to the moving rod cleans the residue on the inner wall of the filter basket. When the compressed air inlet is closed, the piston is pushed by the positioning spring to return the cleaning ring, and the residue on the inner wall of the filter basket is scraped and cleaned. This method greatly improves the cleaning effect of the filter basket.

[0056] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A multi-basket filter for polyester production that does not require disassembly and cleaning, characterized in that: It includes a mounting cylinder and a plurality of filter baskets mounted in the mounting cylinder. A supporting baffle is mounted at the lower position of the mounting cylinder, and the supporting baffle divides the interior of the mounting cylinder into a liquid inlet chamber and a liquid outlet chamber. The filter basket is mounted on the supporting baffle, and a liquid inlet is arranged at the lower end of the filter basket, and the liquid inlet is connected to the liquid inlet chamber; a plurality of flushing nozzles arranged toward the filter basket are installed in the liquid inlet chamber, and the mounting cylinder is connected to a flushing pipe, and the flushing nozzles are all connected to the flushing pipe; an EG inlet and an EG drain port connected to the liquid inlet chamber are provided on the mounting cylinder, and an EG outlet, a compressed air inlet and a vent port connected to the liquid outlet chamber are provided on the mounting cylinder; a moving rod and a plurality of cleaning rings spaced apart up and down are installed in the filter basket, and the cleaning rings are all connected to the moving rod, a piston cylinder is correspondingly arranged in the mounting cylinder and in the compressed air inlet, one end of the piston cylinder is connected to the compressed air inlet, a piston is installed in the piston cylinder, a piston rod is connected to the piston, a positioning spring is installed between the piston and the piston cylinder, the moving rods are all connected to the piston rod, and an air outlet is provided on the side wall of the piston cylinder.

2. The multi-basket filter for polyester production according to claim 1, characterized in that: The flushing nozzle is a spiral nozzle.

3. The multi-basket filter for polyester production according to claim 1, characterized in that: A short pipe is connected between the flushing nozzle and the flushing pipe, and a pipe clamp is connected between the short pipe and the flushing nozzle.

4. The multi-basket filter for polyester production according to claim 1, characterized in that: A three-way joint is installed at the lower part of the installation tube, one end of the three-way joint is connected to the installation tube, and the other two ends serve as an EG inlet and an EG drain port respectively.

5. The multi-basket filter for polyester production according to claim 1, characterized in that: A plurality of flow holes are provided on the supporting partition and on the filter basket in one-to-one correspondence, the liquid inlet is connected to the flow holes correspondingly, a fixing ear is provided on the edge of the flow hole on the supporting partition, a slot is formed between the fixing ear and the supporting partition, a positioning ring is connected to the lower end of the filter basket, and the edge of the positioning ring is stuck in the slot.

6. The multi-basket filter for polyester production according to claim 1, characterized in that: The upper end of the filter basket is connected to a lifting handle.

7. The multi-basket filter for polyester production according to claim 1, characterized in that: A plurality of flushing pipes are arranged, each of which is connected to an extension pipe, which extends to the outside of the installation tube. A plurality of support rods are installed at the bottom of the installation tube, and the flushing pipes are fastened to the support rods.

8. The multi-basket filter for polyester production according to claim 1, characterized in that: The installation cylinder includes a cylinder body, a bottom head and a top head. The bottom head is welded to the bottom of the cylinder body, an upper flange is arranged at the lower end of the top head, and a lower flange is arranged at the upper end of the cylinder body. The upper flange and the lower flange are tightly connected.

9. A filter cleaning method, characterized in that: The cleaning of the multi-basket filter for polyester production according to any one of claims 1 to 8 comprises the following steps: S1, close the EG inlet, then close the EG outlet, at this time the vent and EG drain outlet are closed; S2, open the compressed air inlet to pressurize the EG inside the installation cylinder; S3, open the EG drain port, use the compressed air pressure to reduce the driving force generated by volume expansion, and reversely flush the filter basket; S4, after EG is exhausted, close the compressed air inlet and EG exhaust port; S5, start the EG flushing pump, and the EG flushing pump inputs EG flushing liquid into the flushing pipe; S6, when EG comes out from the vent, turn off the EG flushing pump; S7, repeat S1 to S6; S8. After cleaning, turn on the EG flushing pump and fill the installation cylinder with liquid until EG comes out of the vent; then turn off the EG flushing pump.

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