Rectification device of ethylene glycol production waste liquid recovery system

Abstract

The present application discloses a distillation device of ethylene glycol production waste liquid recovery system, comprising: a reboiler for distillation of material; a discharge pipe connected with the reboiler for discharging waste material; an output pipe connected with the reboiler for conveying material to the distillation column; an input pipe connected with the reboiler for receiving material from the distillation column and conveying to the inside of the reboiler; a cleaning unit connected with the reboiler for cleaning the inside of the reboiler; a heating unit arranged in the reboiler for heating treatment of the material in the cavity of the reboiler; and a discharge unit connected with the reboiler for discharging the scraped waste material. The present application improves the heat received by the material, reduces the material wall sticking, avoids the material blockage at the end of the input pipe, reduces the input efficiency, reduces the maintenance frequency, and further improves the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of distillation equipment technology, and more particularly to a distillation apparatus for a waste liquid recovery system in ethylene glycol production. Background Technology

[0002] Coal-to-ethylene glycol (CTO) is a process that uses coal as raw material to produce ethylene glycol through gasification, coupling, hydrogenation, and distillation. It plays a vital role in my country's coal chemical industry. The production process generates a significant amount of waste liquid, which is complex and contains nearly 40 different synthetic byproducts in varying amounts. However, ethylene glycol and diethylene glycol are present in the largest quantities, accounting for approximately 80% of the total waste liquid, thus possessing high utilization value. Current treatment methods primarily involve conventional vacuum distillation to recover ethylene glycol and diethylene glycol from the waste liquid.

[0003] Existing recovery devices generally use distillation columns for recycling and reuse. Distillation columns include reboilers and condensers. The reboiler heats and expands or even vaporizes the material, reducing its density and allowing it to leave the vaporization space and return smoothly to the column. The gas and liquid phases returning to the column are as follows: the gas phase rises through the trays, while the liquid phase falls to the bottom of the column.

[0004] Due to the static pressure difference, the bottom of the column will be continuously replenished with the evaporated liquid. However, the waste liquid stays in the reboiler for a long time and is prone to polymerization and coking at high temperatures, which can lead to blockage at the reboiler inlet. To address this, the present invention proposes a distillation device for a waste liquid recovery system in ethylene glycol production. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a distillation device for the ethylene glycol production waste liquid recovery system, which improves the heat received by the material, reduces material adhering to the wall, avoids material clogging at the end of the input pipe, thus reducing the input efficiency, reducing the frequency of maintenance, and further improving work efficiency.

[0006] The distillation apparatus of the ethylene glycol production waste liquid recovery system proposed in this invention includes:

[0007] A reboiler is used for the rectification of materials.

[0008] A discharge pipe, connected to the reboiler, is used to discharge waste material;

[0009] An output pipe, connected to the reboiler, is used to transport materials to the distillation column;

[0010] An inlet pipe, connected to the reboiler, is used to receive material from the distillation column and transport it into the reboiler.

[0011] A cleaning unit, connected to the reboiler, is used to clean the interior of the reboiler;

[0012] A heating unit is installed inside the reboiler for heating the material inside the reboiler cavity.

[0013] The discharge unit, connected to the reboiler, is used to discharge the scraped waste material.

[0014] Preferably, the cleaning unit includes a support box, a reciprocating cylinder, a movable block, a movable rod, a connecting rod, and a cleaning ring;

[0015] The support box is fixed to one side of the outer wall of the input pipe, and the support box is used to provide space for the movement of the movable block;

[0016] The reciprocating cylinder is mounted on the outside of the input pipe via a support frame, and the reciprocating cylinder is used to control the movement of the movable block;

[0017] The movable block is connected to the output end of the reciprocating cylinder and located in the inner cavity of the support box. The movable block is used to drive the movable rod to move axially.

[0018] The movable rod is slidably installed in the inner cavity of the input pipe, and the movable rod is used to drive the connecting rod to move synchronously;

[0019] The connecting rod is fixed to the outer wall of the movable rod. One end of the connecting rod is fixedly connected to a cleaning ring, and the other end of the connecting rod is fixedly connected to a reset unit. The reset unit drives the connecting rod and the cleaning ring to move synchronously.

[0020] Preferably, the reset unit includes a guide groove, a stop block, a telescopic block, a sealing plate, a first positioning rod, and a first spring;

[0021] The guide groove is formed in the inner cavity of the input tube and extends into the inside of the support box. The guide groove is used to guide the axial movement of the movable rod.

[0022] The abutment block is fixed on the guide groove, and the abutment block and the movable rod are misaligned along the axial movement trajectory;

[0023] The telescopic block is slidably mounted inside the movable rod and extends to the outside of the movable rod, and the telescopic block is used to receive the thrust from the movable block;

[0024] The sealing plate is fixed to both ends of the outer wall of the movable rod, and the sealing plate is used to separate the input pipe from the support box.

[0025] The first positioning rod is fixed to the end of the telescopic block and located in the inner cavity of the movable rod. The first positioning rod is used to provide guidance for the sliding of the telescopic block.

[0026] The first spring is respectively engaged with the outer wall of the telescopic block and the inner cavity of the movable rod, and the first spring is used to provide elastic force for the telescopic block to reset.

[0027] Preferably, the outer walls of the abutment block and the telescopic block are both inclined, and the inclined surfaces of the abutment block and the telescopic block are close to each other. The inner cavity of the movable rod is formed with a groove that matches the lateral movement trajectory of the telescopic block.

[0028] Preferably, the inner wall of the input pipe is formed with a movable groove for the axial movement of the sealing plate, so that when the sealing plate moves with the movable rod, the material inside the input pipe is prevented from entering the inner cavity of the support box.

[0029] Preferably, the outer wall of the movable block matches the inner cavity of the support box, and the telescopic block extends into the inner cavity of the support box, coinciding with the movement trajectory of the movable block.

[0030] Preferably, the outer wall of the cleaning ring is generally circular, and the outer wall of the cleaning ring matches the inner cavity of the input pipe.

[0031] Preferably, the heating unit includes a heater and heating tubes. The heater is fixed to the outer wall of the end of the reboiler and is used to control the operation of the heating tubes. The heating tubes are distributed inside the reboiler and are used to heat the material inside the reboiler.

[0032] Preferably, the discharge unit includes a discharge box, a first partition, a second partition, a third partition, a transmission rod, a second positioning rod, and a second spring;

[0033] The discharge box is fixed to the bottom of the input pipe and is used to collect scraped waste material;

[0034] The first partition is axially slidably installed inside the discharge box and extends into the inner cavity of the discharge box. The first partition is used for the first collection of waste.

[0035] The second partition is axially slidably installed on the outer wall of the discharge box and extends through the discharge box to the inside of the discharge box. The second partition is used to separate the discharge box from the input pipe. The first partition is also used for secondary collection of waste.

[0036] The third partition is axially slidably installed at the bottom of the discharge box. The third partition is used for the third collection of materials and to seal the bottom of the discharge box.

[0037] The transmission rod is located outside the discharge box and is fixed to the ends of the first partition, the second partition, and the third partition respectively. The transmission rod is used to synchronously drive the first partition, the second partition, and the third partition to move.

[0038] The second positioning rod is fixed to the outer wall of the discharge box and passes through the transmission rod. The second positioning rod is used to guide the axial movement of the transmission rod.

[0039] The two ends of the second spring are fixed to the outer wall of the discharge box and the outer wall of the transmission rod, respectively. The second spring is used to provide elastic force for the reset of the transmission rod.

[0040] Preferably, the inner cavity of the discharge box is formed with a docking groove for the first partition and the second partition to enter. The first partition, the second partition and the third partition are staggered vertically to isolate the discharge box and the input pipe one by one. The inner cavity of the discharge box is far from the inner side of the transmission rod and is formed with two inclined surfaces. The top of the first partition is fixed with a force-bearing rod extending into the inner cavity of the input pipe.

[0041] Beneficial technical effects of the present invention:

[0042] This invention improves work efficiency by incorporating a cleaning unit and a heating unit. By increasing the contact area between the heating tube and the material, the material receives more heat. The cleaning unit also cleans the material aggregated at the end of the input tube, reducing material buildup and preventing blockages that could reduce input efficiency. This lowers the frequency of maintenance and further improves work efficiency. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the distillation unit of the ethylene glycol production waste liquid recovery system proposed in this invention;

[0044] Figure 2 This is a cross-sectional view of the internal structure of the reboiler proposed in this invention;

[0045] Figure 3 This is a schematic diagram of the installation structure of the movable block proposed in this invention;

[0046] Figure 4 This is a partial enlarged view of point A of the active block proposed in this invention;

[0047] Figure 5 This is a schematic diagram of the installation structure of the telescopic block proposed in this invention;

[0048] Figure 6 This is a partial enlarged view of point B of the telescopic block proposed in this invention;

[0049] Figure 7 This is a schematic diagram of the material discharge unit proposed in this invention.

[0050] In the diagram: 1-Reboiler, 2-Discharge pipe, 3-Output pipe, 4-Input pipe, 5-Cleaning unit, 501-Support box, 502-Reciprocating cylinder, 503-Moving block, 504-Guide groove, 505-Abutting block, 506-Moving rod, 507-Telescopic block, 508-Sealing plate, 509-Connecting rod, 510-Cleaning ring, 511-First positioning rod, 512-First spring, 6-Heating unit, 601-Heater, 602-Heating tube, 7-Discharge unit, 701-Discharge box, 702-First partition, 703-Second partition, 704-Third partition, 705-Transmission rod, 706-Second positioning rod, 707-Second spring. Detailed Implementation

[0051] The present invention will be further explained below with reference to specific embodiments.

[0052] Reference Figure 1-3 and Figure 7 The distillation apparatus of the ethylene glycol production waste liquid recovery system proposed in this invention includes: a reboiler 1 for material distillation; a discharge pipe 2 connected to the reboiler 1 for discharging waste; an output pipe 3 connected to the reboiler 1 for conveying material to the distillation column; an input pipe 4 connected to the reboiler 1 for receiving material from the distillation column and conveying it into the reboiler 1; a cleaning unit 5 connected to the reboiler 1 for cleaning the interior of the reboiler 1; a heating unit 6 disposed inside the reboiler 1 for heating the material inside the reboiler 1; and a discharge unit 7 connected to the reboiler 1 for discharging the scraped waste.

[0053] Reference Figure 3 In a preferred embodiment of the present invention, the cleaning unit 5 includes a support box 501, a reciprocating cylinder 502, a movable block 503, a movable rod 506, a connecting rod 509, and a cleaning ring 510. The support box 501 is fixed to one side of the outer wall of the input pipe 4, and provides space for the movement of the movable block 503. The reciprocating cylinder 502 is mounted on the outside of the input pipe 4 via a support frame, and controls the movement of the movable block 503. The movable block 503 is connected to the reciprocating cylinder 502. The output end of 2 is located in the inner cavity of the support box 501. The movable block 503 is used to drive the movable rod 506 to move axially. The movable rod 506 is slidably installed in the inner cavity of the input pipe 4. The movable rod 506 is used to drive the connecting rod 509 to move synchronously. The connecting rod 509 is fixed on the outer wall of the movable rod 506. One end of the connecting rod 509 is fixedly connected to a cleaning ring 510, and the other end of the connecting rod 509 is fixedly connected to a reset unit. The reset unit drives the connecting rod 509 and the cleaning ring 510 to move synchronously.

[0054] Reference Figure 4-6As a preferred embodiment of the present invention, the reset unit includes a guide groove 504, a stop block 505, a telescopic block 507, a sealing plate 508, a first positioning rod 511, and a first spring 512; the guide groove 504 is formed in the inner cavity of the input pipe 4 and extends into the support box 501, and the guide groove 504 is used to guide the axial movement of the movable rod 506; the stop block 505 is fixed on the guide groove 504, and the stop block 505 and the movable rod 506 are misaligned along the axial movement trajectory; the telescopic block 507 is slidably installed inside the movable rod 506 and extends into the movable rod 506. Externally, the telescopic block 507 is used to receive the thrust from the movable block 503; the sealing plate 508 is fixed to both ends of the outer wall of the movable rod 506, and the sealing plate 508 is used to separate the input pipe 4 from the support box 501; the first positioning rod 511 is fixed to the end of the telescopic block 507 and located in the inner cavity of the movable rod 506, and the first positioning rod 511 is used to provide guidance for the sliding of the telescopic block 507; the two ends of the first spring 512 are respectively engaged with the outer wall of the telescopic block 507 and the inner cavity of the movable rod 506, and the first spring 512 is used to provide elastic force for the reset of the telescopic block 507.

[0055] In addition, the outer walls of the abutment block 505 and the telescopic block 507 are both inclined, and the inclined surfaces of the abutment block 505 and the telescopic block 507 are close to each other. The inner cavity of the movable rod 506 is formed with a groove that matches the lateral movement trajectory of the telescopic block 507. The inner wall of the input pipe 4 is formed with a movable groove for the axial movement of the sealing plate 508, so that when the sealing plate 508 moves with the movement of the movable rod 506, the material in the inner cavity of the input pipe 4 is prevented from entering the inner cavity of the support box 501.

[0056] Through the above structure, the setting of the abutment block 505 and the telescopic block 507 allows the movable block 503 to drive the telescopic block 507 to move back and forth synchronously during the reciprocating movement without contacting the abutment block 505. Furthermore, during the process of the movable block 503 pulling the telescopic block 507, the abutment block 505 can apply a squeezing force to the telescopic block 507, causing the abutment block 505 to enter the inner cavity of the movable rod 506 and disengage from the pull of the movable block 503.

[0057] The outer wall of the movable block 503 matches the inner cavity of the support box 501, and the telescopic block 507 extends into the inner cavity of the support box 501 and coincides with the movement trajectory of the movable block 503; the outer wall of the cleaning ring 510 is in the shape of a ring, and the outer wall of the cleaning ring 510 matches the inner cavity of the input pipe 4.

[0058] The above structure allows the cleaning ring 510 to clean the inner cavity of the input pipe 4 during the pulling process, and the telescopic block 507, which coincides with the moving trajectory of the movable block 503, can be driven by the movable block 503 to move synchronously.

[0059] Reference Figure 2As a preferred embodiment of the present invention, the heating unit 6 includes a heater 601 and a heating tube 602. The heater 601 is fixed to the outer wall of the end of the reboiler 1 and is used to control the operation of the heating tube 602. The heating tube 602 is distributed inside the reboiler 1 and is used to heat the material inside the reboiler 1.

[0060] When using this device, the heating tube 602 is started to work by activating the heater 601 to heat the material inside the reboiler 1. The curved heating tube 602 increases the contact area with the material by increasing the path, which further improves the heating efficiency.

[0061] Reference Figure 7 As a preferred embodiment of the present invention, the discharge unit 7 includes a discharge box 701, a first partition 702, a second partition 703, a third partition 704, a transmission rod 705, a second positioning rod 706, and a second spring 707. The discharge box 701 is fixed to the bottom of the input pipe 4 and is used to collect scraped waste. The first partition 702 is axially slidably installed inside the discharge box 701 and extends into the inner cavity of the discharge box 701. The first partition 702 is used for the first collection of waste. The second partition 703 is axially slidably installed on the outer wall of the discharge box 701 and penetrates the discharge box 701 to its interior. The second partition 703 is used to separate the discharge box 701 from the input pipe 4. The first partition 702 is also used for the second collection of waste. The third partition 704 is axially slidably installed at the bottom of the discharge box 701. The third partition 704 is used for the third collection of materials and to seal the bottom of the discharge box 701. The transmission rod 705 is located outside the discharge box 701 and is fixed to the ends of the first partition 702, the second partition 703, and the third partition 704 respectively. The transmission rod 705 is used to synchronously drive the first partition 702, the second partition 703, and the third partition 704 to move. The second positioning rod 706 is fixed to the outer wall of the discharge box 701 and passes through the transmission rod 705. The second positioning rod 706 is used to provide guidance for the axial movement of the transmission rod 705. The two ends of the second spring 707 are fixed to the outer wall of the discharge box 701 and the outer wall of the transmission rod 705 respectively. The second spring 707 is used to provide elastic force for the reset of the transmission rod 705.

[0062] During the material conveying process, the reciprocating cylinder 502 is activated. The operation of the reciprocating cylinder 502 pushes the movable block 503 connected to the output end to move reciprocally. As the movable block 503 moves forward, it contacts the inclined outer wall of the telescopic block 507. Since the telescopic block 507 is at its maximum moving distance position at this time, a compressive force is applied to the telescopic block 507, causing it to drive the first positioning rod 511 into the inner cavity of the movable rod 506 and apply a compressive force to the first spring 512 until the movable block 503 passes the telescopic block 506. 7. At this time, the telescopic block 507 will also reset under the elastic force of the first spring 512, and the movable block 503 will move to its maximum moving distance. Then, the movable block 503 will move backward under the action of the reciprocating cylinder 502. The outer wall of the movable block 503 will contact the vertical surface of the telescopic block 507, thereby driving the telescopic block 507 and the movable rod 506 to move axially synchronously. The axial movement of the movable rod 506 will synchronously drive the connecting rod 509 and the cleaning ring 510 to move axially, so that the outer wall of the cleaning ring 510 enters the inner cavity of the input pipe 4, thereby cleaning the input pipe. 4. Scrape the material at the outlet position of the inner cavity end to prevent material aggregation until the inclined outer wall of the telescopic block 507 contacts the inclined surface of the abutment block 505. The contacting telescopic block 507 will be subjected to the squeezing force from the abutment block 505, thus entering the inner cavity of the movable rod 506. The movable block 503 will no longer be in contact with the telescopic block 507, and the telescopic block 507, which has entered the inner cavity of the movable rod 506, will no longer be moved by the pulling force from the movable block 503. The movable block 503 will move forward again under the static pressure difference of the material exiting the end of the input pipe 4, completing the reset and achieving the desired result. To clean the inner cavity of the input pipe 4 and prevent material from accumulating, thus further improving work efficiency, it should be noted that if the movable rod 506 is not fully reset, the movable block 503, which moves forward again, will move with the inclined surface of the telescopic block 507. Since the movable rod 506 and the telescopic block 507 have not moved to their maximum moving distance at this time, the movable rod 506 will move axially along the inner cavity of the guide groove 504 under the thrust of the movable block 503. The telescopic block 507 will not retract into the inner cavity of the movable rod 506 if it has moved a distance.

[0063] Meanwhile, as the cleaning ring 510 cleans the inner cavity of the input pipe 4, the scraped waste material will enter the top of the first partition 702. The continued movement of the cleaning ring 510 will contact the force-bearing rod at the top of the first partition 702, thus providing a thrust to the discharge box 701. The discharge box 701, under this thrust, will synchronously drive the second partition 703 and the third partition 704 to move via the transmission rod 705. The opened first partition 702 allows the material on its upper surface to fall onto the second partition 703 or the third partition 704. The movement of the first partition 702 opens the connection between the input pipe 4 and the discharge box 701, while the third partition 704 still isolates the discharge box 701 from the outside. When the first partition 702 moves normally, the second partition 703... The end of the second partition 703 will enter the inner cavity of the discharge box 701, completing the sealing and isolation between the discharge box 701 and the input pipe 4. As the discharge box 701 continues to move, the third partition 704 will also open, and the waste will fall off the top of the transmission rod 705 after it is opened, completing the discharge. When the cleaning ring 510 is reset, the first partition 702, the second partition 703, and the third partition 704 will also be reset synchronously under the action of the transmission rod 705, which is reset under the elastic force of the second spring 707. The reset second partition 703 will open, and the waste on the upper surface of the second partition 703 will fall onto the upper surface of the third partition 704, waiting for the third partition 704 to open again. This cycle repeats to complete the discharge operation of the waste.

[0064] In addition, the inner cavity of the discharge box 701 is formed with a docking groove for the first partition 702 and the second partition 703 to enter. The first partition 702, the second partition 703 and the third partition 704 are staggered vertically to isolate the discharge box 701 and the input pipe 4 one by one. The inner cavity of the discharge box 701 is far from the inner side of the transmission rod 705 and has two inclined surfaces. The top of the first partition 702 is fixed with a force-bearing rod extending into the inner cavity of the input pipe 4.

[0065] The above structure allows the reciprocating cleaning ring 510 to move the second partition 702 synchronously at the last distance, thereby opening the connection between the second partition and the input pipe 4. The first partition 702, the second partition 703, and the third partition 704 are staggered to open the connection between the discharge box 701 and the outside layer by layer, so that the inside of the input pipe 4 is not in contact with the outside, thus completing the material discharge operation.

Claims

1. A distillation unit for an ethylene glycol production waste liquid recovery system, characterized in that, include: A reboiler (1) is used for the distillation of materials; The discharge pipe (2) is connected to the reboiler (1) and is used to discharge waste material; The output pipe (3) is connected to the reboiler (1) and is used to transport the material to the distillation column; The input pipe (4) is connected to the reboiler (1) and is used to receive material from the distillation column and transport it into the reboiler (1); The cleaning unit (5) is connected to the reboiler (1) and is used to clean the inside of the input pipe (4); A heating unit (6) is provided inside the reboiler (1) for heating the material inside the reboiler (1); The discharge unit (7) is connected to the input pipe (4) and is used to discharge the waste material scraped off by the cleaning unit (5); The discharge unit (7) includes a discharge box (701), a first partition (702), a second partition (703), a third partition (704), a transmission rod (705), a second positioning rod (706), and a second spring (707); The discharge box (701) is fixed to the bottom of the input pipe (4), and the discharge box (701) is used to collect scraped waste; The first partition (702) is axially slidably installed inside the discharge box (701) and extends into the inner cavity of the discharge box (701). The first partition (702) is used for the first collection of waste. The second partition (703) is axially slidably installed on the outer wall of the discharge box (701) and extends through the discharge box (701) to the interior of the discharge box (701). The second partition (703) is used to separate the discharge box (701) and the input pipe (4). The first partition (702) is also used for secondary collection of waste. The third partition (704) is axially slidably installed at the bottom of the discharge box (701). The third partition (704) is used for the third collection of materials and to seal the bottom of the discharge box (701). The transmission rod (705) is located outside the discharge box (701) and is fixed to the ends of the first partition (702), the second partition (703), and the third partition (704) respectively. The transmission rod (705) is used to synchronously drive the first partition (702), the second partition (703), and the third partition (704) to move. The second positioning rod (706) is fixed to the outer wall of the discharge box (701) and passes through the transmission rod (705). The second positioning rod (706) is used to provide guidance for the axial movement of the transmission rod (705). The two ends of the second spring (707) are respectively fixed to the outer wall of the discharge box (701) and the outer wall of the transmission rod (705). The second spring (707) is used to provide elastic force for the reset of the transmission rod (705). The inner cavity of the discharge box (701) is formed with a docking groove for the first partition (702) and the second partition (703) to enter. The first partition (702), the second partition (703) and the third partition (704) are staggered vertically to isolate the discharge box (701) and the input pipe (4) one by one. The inner cavity of the discharge box (701) is far from the inner side of the transmission rod (705) and has two inclined surfaces. The top of the first partition (702) is fixed with a force-bearing rod extending into the inner cavity of the input pipe (4).

2. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 1, characterized in that, The cleaning unit (5) includes a support box (501), a reciprocating cylinder (502), a movable block (503), a movable rod (506), a connecting rod (509), and a cleaning ring (510). The support box (501) is fixed to one side of the outer wall of the input pipe (4), and the support box (501) provides space for the movement of the movable block (503); The reciprocating cylinder (502) is mounted on the outside of the input pipe (4) via a support frame, and the reciprocating cylinder (502) is used to control the movement of the movable block (503); The movable block (503) is connected to the output end of the reciprocating cylinder (502) and located in the inner cavity of the support box (501). The movable block (503) is used to drive the movable rod (506) to move axially. The movable rod (506) is slidably installed in the inner cavity of the input pipe (4), and the movable rod (506) is used to drive the connecting rod (509) to move synchronously; The connecting rod (509) is fixed to the outer wall of the movable rod (506). One end of the connecting rod (509) is fixedly connected to a cleaning ring (510), and the other end of the connecting rod (509) is fixedly connected to a reset unit. The reset unit drives the connecting rod (509) and the cleaning ring (510) to move synchronously.

3. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 2, characterized in that, The reset unit includes a guide groove (504), a stop block (505), a telescopic block (507), a sealing plate (508), a first positioning rod (511), and a first spring (512). The guide groove (504) is formed in the inner cavity of the input pipe (4) and extends into the support box (501). The guide groove (504) is used to guide the axial movement of the movable rod (506). The abutment (505) is fixed on the guide groove (504), and the abutment (505) and the movable rod (506) are misaligned along the axial movement trajectory; The telescopic block (507) is slidably mounted inside the movable rod (506) and extends to the outside of the movable rod (506), and the telescopic block (507) is used to receive the thrust from the movable block (503); The sealing plate (508) is fixed to both ends of the outer wall of the movable rod (506), and the sealing plate (508) is used to separate the input pipe (4) from the support box (501). The first positioning rod (511) is fixed to the end of the telescopic block (507) and located in the inner cavity of the movable rod (506). The first positioning rod (511) is used to provide guidance for the sliding of the telescopic block (507). The first spring (512) is respectively engaged with the outer wall of the telescopic block (507) and the inner cavity of the movable rod (506). The first spring (512) is used to provide elastic force for the resetting of the telescopic block (507).

4. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 3, characterized in that, The outer walls of the abutment block (505) and the telescopic block (507) are both inclined, and the inclined surfaces of the abutment block (505) and the telescopic block (507) are close to each other. The inner cavity of the movable rod (506) is formed with a groove that matches the lateral movement trajectory of the telescopic block (507).

5. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 3, characterized in that, The inner wall of the input pipe (4) is formed with a movable groove for the axial movement of the sealing plate (508), so that when the sealing plate (508) moves with the movement of the movable rod (506), the material in the inner cavity of the input pipe (4) is prevented from entering the inner cavity of the support box (501).

6. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 3, characterized in that, The outer wall of the movable block (503) matches the inner cavity of the support box (501), and the telescopic block (507) extends into the inner cavity of the support box (501) and coincides with the movement trajectory of the movable block (503).

7. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 2, characterized in that, The outer wall of the cleaning ring (510) is generally circular, and the outer wall of the cleaning ring (510) matches the inner cavity of the input pipe (4).

8. The distillation apparatus of the ethylene glycol production waste liquid recovery system according to claim 1, characterized in that, The heating unit (6) includes a heater (601) and a heating tube (602). The heater (601) is fixed to the outer wall of the end of the reboiler (1). The heater (601) is used to control the operation of the heating tube (602). The heating tube (602) is distributed inside the reboiler (1). The heating tube (602) is used to heat the material inside the reboiler (1).

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