Separation system and washing tower

Abstract

The utility model relates to a separation system and a washing tower. The separation system comprises a first washing tower, a second washing tower and a washing device, wherein the first washing tower is used for carrying out washing treatment on steam containing polyamide degradation products to obtain a liquid first mixture and gas; the water washing device is used for carrying out water washing treatment on the liquid material discharged from the first washing tower; and the second washing tower is used for washing the gas. The separation system disclosed by the embodiment of the utility model can be used for treating the steam generated in the polyamide production process, and the problem of environmental pollution caused by direct emission is solved by absorbing and separating the steam.

Description

Technical Field

[0001] This utility model relates to a separation device, and more particularly to the separation of steam generated during the production of polyamide. Background Technology

[0002] The production process of polyamide generates vapors containing impurities, degraded polymers, and amines, with the amines being produced by polymer degradation. If these vapors are released into the environment, they will cause pollution. Therefore, these vapors need to be treated to reduce or eliminate the pollution they cause. Utility Model Content

[0003] To overcome at least one of the defects of the prior art, in a first aspect, one embodiment of the present invention provides a separation system, including a first washing tower, a second washing tower, and a water washing device; wherein, the first washing tower is used to wash vapor containing polyamide degradation products to obtain a liquid first mixture and a gas; the water washing device is used to wash the liquid material discharged from the first washing tower; and the second washing tower is used to wash the gas.

[0004] According to one embodiment of the present invention, a weir plate is provided in the first washing tower. The weir plate includes a horizontal part and an inclined part. A plurality of through holes are provided on the inclined part. The inclined part is located between the top of the first washing tower and the horizontal part, and is inclined relative to the horizontal part. Part of the liquid material falling from the top of the tower can fall to the horizontal part through the through holes.

[0005] According to one embodiment of the present invention, the weir plate is disposed on the side wall of the first washing tower; and / or,

[0006] The horizontal portion is connected to the inclined portion; and / or

[0007] Both the horizontal portion and the inclined portion are flat plates; and / or,

[0008] The angle between the horizontal portion and the inclined portion is 40° to 50°; and / or

[0009] The angle between the horizontal section and the height direction of the first washing tower is 85-90°.

[0010] According to one embodiment of the present invention, the height of the first washing tower is h, and the distance between the horizontal portion of the weir plate and the bottom of the first washing tower is 1 / 5 to 1 / 4h; and / or,

[0011] The angle between the horizontal section and the height direction of the first washing tower is 89-90°; and / or

[0012] A first liquid outlet is provided on the side wall of the first washing tower, and the third mixture located on the horizontal part can be discharged from the first washing tower through the first liquid outlet.

[0013] According to one embodiment of the present invention, along the height direction of the first washing tower, the first liquid outlet is located between the horizontal part and the inclined part; and / or, the first liquid outlet is connected to the water washing device.

[0014] According to one embodiment of the present invention, the separation system further includes a first filter and a first heat exchanger, wherein the second washing tower, the first filter, and the first heat exchanger are connected to each other to form a circulation path, and the liquid mixture discharged from the second washing tower can be returned to the second washing tower after being processed by the first filter and the first heat exchanger; and / or,

[0015] The separation system further includes a second filter and a second heat exchanger, the second filter being connected to the water washing device and the second heat exchanger, respectively.

[0016] According to one embodiment of this utility model, a third liquid inlet and a third liquid outlet are provided on the second washing tower, the third liquid outlet being connected to the first filter, and the third liquid inlet being connected to the first heat exchanger; and / or

[0017] A fourth liquid outlet is provided on the second washing tower, and the fourth liquid outlet is connected to the first washing tower; and / or,

[0018] The second heat exchanger is connected to the first washing tower.

[0019] According to one embodiment of the present invention, a first liquid inlet is provided on the first washing tower, and the first liquid inlet is located between the top of the first washing tower and the weir plate along the height direction of the first washing tower; the fourth liquid outlet is connected to the first liquid inlet.

[0020] Secondly, one embodiment of this utility model provides a washing tower, including a weir plate. The weir plate includes a horizontal part and an inclined part. A plurality of through holes are provided on the inclined part. The inclined part is located between the top of the washing tower and the horizontal part and is inclined relative to the horizontal part. Part of the liquid material falling from the top of the tower can fall to the horizontal part through the through holes.

[0021] According to one embodiment of the present invention, the weir plate is disposed on the side wall of the washing tower; and / or,

[0022] The angle between the horizontal portion and the inclined portion is 40° to 50°; and / or

[0023] The angle between the horizontal section and the height direction of the washing tower is 85° to 90°; and / or,

[0024] A first liquid outlet is provided on the side wall of the washing tower, through which liquid material located on the horizontal section can be discharged from the washing tower.

[0025] The separation system of this invention can be used to treat the steam generated during the production of polyamide. By absorbing and separating the steam, the environmental pollution problem caused by direct emission is solved. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0027] in:

[0028] Figure 1 This is a schematic diagram of the separation system according to one embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a weir plate according to one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the weir plate according to another embodiment of the present invention;

[0031] The annotations in the attached figures are explained as follows:

[0032] 10. First washing tower; 10a. Reserved opening; 11. Horizontal section; 11a. Overflow plate; 12. Inclined section; 12a. Through hole; 20. Second washing tower; 21. First filter; 22. Washing circulation pump; 23. First heat exchanger; 30. Water washing device; 31. Second filter; 32. Water washing circulation pump; 33. Second heat exchanger. Detailed Implementation

[0033] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the description herein is for illustrative purposes only and not intended to limit this utility model.

[0034] Reference Figure 1As shown, one embodiment of this utility model provides a separation system, including a first washing tower 10, a second washing tower 20, and a water washing device 30; wherein, the first washing tower 10 is used to wash the vapor containing polyamide degradation products to obtain a liquid first mixture and a gas; the water washing device 30 is used to wash the liquid material discharged from the first washing tower 10; the second washing tower 20 is used to wash the gas discharged from the first washing tower 10 to obtain a mixed liquid.

[0035] In one embodiment, the vapor processed by the separation system may include polyamide degradation products, amines, and other impurities.

[0036] In one embodiment, in the first scrubbing tower 10, the spraying of the spraying agent can rapidly condense and cool the steam to obtain a liquid first mixture and a gas. The gas is discharged from the top of the first scrubbing tower 10, and the first mixture falls inside the first scrubbing tower 10 under the action of gravity. The spraying agent can be water or an aqueous solution.

[0037] In one embodiment, the polyamide degradation products can be sublimated by the cooling spray of the first washing tower 10 and exist in the first mixture in solid form, while amines and other impurities are dissolved in the spraying agent and exist in the first mixture in the form of solutes.

[0038] In one embodiment, a weir plate is provided in the first washing tower 10, through which the first mixture can be separated to obtain a second mixture containing polyamide degradation solids collected at the bottom of the tower and a third mixture collected at the weir plate.

[0039] In one implementation, reference Figures 1 to 3 As shown, the weir plate can be installed on the side wall of the first washing tower 10. The weir plate includes a horizontal part 11 and an inclined part 12. A plurality of through holes 12a are provided on the inclined part 12. The inclined part 12 is located between the top of the first washing tower 10 and the horizontal part 11, and is inclined relative to the horizontal part 11. That is, the inclined part 12 is inclined above the horizontal part 11, and some liquid material falling from the top of the tower can fall onto the horizontal part 11 through the through holes 12a of the inclined part 12.

[0040] In one embodiment, the horizontal portion 11 and the inclined portion 12 have an included angle θ. The horizontal portion 11 is disposed substantially perpendicular to the side wall of the first washing tower 10 or is disposed substantially horizontally. The inclined portion 12 is disposed inclinedly on the horizontal portion 11, such that liquid falling in the vertical direction (or the height direction of the first washing tower 10) will slide down its surface or fall through the through hole 12a onto the horizontal portion 11 after falling onto the inclined portion 12.

[0041] In one embodiment, the included angle θ between the horizontal portion 11 and the inclined portion 12 can be 40 to 50°, for example 42°, 44°, 45°, 46°, or 48°.

[0042] In one embodiment, the through-hole 12a of the inclined portion 12 can be a circular hole with a diameter of 2-6 mm, such as 3 mm, 4 mm, or 5 mm. During operation, after the liquid first mixture falls onto the weir plate, the solid polyamide degradation products and a small portion of the spray agent slide from the surface of the inclined portion 12 to the bottom of the first washing tower 10 (second mixture), while most of the spray agent falls through the through-hole 12a to the horizontal portion 11 (third mixture). Furthermore, the liquid in the second mixture can be passed into the water washing device 30 for treatment, and the polyamide degradation products can be periodically cleaned through the reserved port 10a provided on the bottom side wall of the first washing tower 10.

[0043] In one embodiment, the sum of the angle between the axis of the through hole 12a of the inclined portion 12 and the horizontal portion 11 and the angle θ is 90°.

[0044] In one embodiment, both the horizontal portion 11 and the inclined portion 12 are flat plates, and the horizontal portion 11 and the inclined portion 12 are connected. Further, the angle between the horizontal portion 11 and the height direction (or the side wall of the first washing tower 10) can be 85–90°, more specifically 89–90°, for example 86°, 88°, 89.1°, 89.2°, 89.3°, 89.4°, 89.5°, 89.6°, 89.7°, 89.8°, or 89.9°.

[0045] In one embodiment, the height of the first washing tower 10 is h, and the distance between the horizontal portion 11 of the weir plate and the bottom of the first washing tower 10 is 1 / 5 to 1 / 4h.

[0046] In one embodiment, the first scrubbing tower 10 is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet, and a second liquid outlet; further, the first liquid inlet may be located above the second liquid inlet, and the first liquid inlet or the second liquid inlet may be opened on the top of the first scrubbing tower 10 or on the side wall adjacent to the top, and the first liquid inlet and the second liquid inlet may be used to provide spray agent to the first scrubbing tower 10.

[0047] In one embodiment, along the height direction of the first washing tower 10, both the first liquid inlet and the second liquid inlet can be located between the top of the first washing tower 10 and the weir plate.

[0048] In one embodiment, the first liquid outlet is located on the side wall of the first washing tower 10, adjacent to the horizontal section 11, so that the liquid third mixture on the horizontal section 11 can be discharged from the first washing tower 10 through the first liquid outlet. Furthermore, the first liquid outlet is connected to a water washing device 30, allowing the third mixture to enter the water washing device 30 for water washing treatment.

[0049] In one implementation, reference Figure 3 As shown, an overflow plate 11a can be installed on the horizontal portion 11 of the weir plate. The overflow plate 11a is installed on the side wall of the first scrubbing tower 10, and the first liquid outlet is located above the overflow plate 11a. The installation of the overflow plate 11a helps to fix the horizontal portion 11 to the side wall of the first scrubbing tower 10. Furthermore, the overflow plate 11a is connected to the horizontal portion 11 and is installed perpendicular to the horizontal portion 11. The height of the overflow plate 11a can be 280-320mm, for example, 290mm, 295mm, 298mm, 300mm, 302mm, 305mm, or 310mm.

[0050] In one embodiment, along the height direction of the first washing tower 10, the first liquid outlet is located between the horizontal portion 11 and the inclined portion 12.

[0051] In one embodiment, the second liquid outlet is located on the side wall of the first washing tower 10, near the bottom of the tower, and is connected to the water washing device 30. The liquid in the second mixture can enter the water washing device 30 through the second liquid outlet for water washing treatment.

[0052] In one embodiment, an air inlet is provided on the second scrubbing tower 20, which is connected to the top of the first scrubbing tower 10 to receive gas from the first scrubbing tower 10. The gas discharged from the first scrubbing tower 10 includes a large amount of water vapor and a small amount of amine compounds, which can be absorbed by the scrubbing (cooling and condensation treatment) of the second scrubbing tower 20.

[0053] In one embodiment, a third liquid inlet and a third liquid outlet are provided on the second washing tower 20. The third liquid inlet may be located at the top of the tower and the third liquid outlet may be located at the bottom of the tower.

[0054] In one embodiment, the separation system further includes a first filter 21 and a first heat exchanger 23. The second washing tower 20, the first filter 21, and the first heat exchanger 23 are connected to each other to form a circulation path. The liquid mixture discharged from the second washing tower 20 can be filtered by the first filter 21, heat-exchanged by the first heat exchanger 23, and then returned to the second washing tower 20 for reuse as a detergent. Furthermore, the second washing tower 20 is connected to the first heat exchanger 23 through a third inlet and to the first filter 21 through a third outlet.

[0055] In one embodiment, a washing circulation pump 22 is provided between the first filter 21 and the first heat exchanger 23 for transporting liquid in the circulation path.

[0056] In one embodiment, a fourth liquid outlet is provided on the second washing tower 20, which is connected to the first washing tower 10 and used to transport the liquid in the second washing tower 20 to the first washing tower 10 for use as a spraying agent. Further, the fourth liquid outlet of the second washing tower 20 is connected to the first liquid inlet of the first washing tower 10. Still further, the fourth liquid outlet is located on the side wall of the second washing tower 20, near the bottom, allowing a portion of the liquid material in the second washing tower 20 to overflow into the first washing tower 10 through the fourth liquid outlet.

[0057] In one embodiment, the washing device 30 can be a washing tank. The liquid material discharged from the first washing tower 10 can be fed into the washing device 30 for washing treatment. For example, the first mixture obtained from washing can be directly collected at the bottom of the tower, and then the liquid material at the bottom of the tower can be fed into the washing device 30 through the second liquid outlet; alternatively, the first mixture can be separated by a weir plate to obtain a second mixture collected at the bottom of the tower and a third mixture collected at the horizontal part 11 of the weir plate, and then the liquid material in the second mixture and the third mixture can be fed into the washing device 30 respectively.

[0058] In one embodiment, the washing device 30 includes a top inlet through which water can be added during operation. Furthermore, the washing device 30 is provided with an overflow outlet through which excess liquid can be discharged.

[0059] In one embodiment, the separation system further includes a second filter 31 and a second heat exchanger 33, the second filter 31 being connected to the water washing device 30 and the second heat exchanger 33 respectively; further, the second heat exchanger 33 is connected to the first washing tower 10. After the liquid discharged from the first washing tower 10 is washed by the water washing device 30, a portion of the liquid can be filtered by the second filter 31, heat-exchanged by the second heat exchanger 33, and then returned to the first washing tower 10 for reuse as a spraying agent.

[0060] In one embodiment, the second heat exchanger 33 is connected to the second inlet of the first washing tower 10.

[0061] In one embodiment, a water washing circulation pump 32 is provided between the second filter 31 and the second heat exchanger 33 for transporting liquid.

[0062] In one embodiment, corresponding auxiliary components, such as regulating valves, are provided on each connecting pipeline; a level gauge may be provided on the water washing device 30. The above-mentioned components are all auxiliary components that realize the corresponding functions, and will not be described in detail in this article.

[0063] Reference Figure 1 As shown, one embodiment of this utility model provides a washing tower, whose structure and usage are the same as the first washing tower 10.

[0064] In one embodiment of the separation system of this utility model, during operation, the steam to be treated is introduced into the first scrubbing tower 10 and cooled and condensed by a spraying agent to obtain a liquid first mixture containing polyamide degradation products and a small amount of gas. The gas is discharged from the top of the first scrubbing tower 10 and enters the second scrubbing tower 20 for washing. The liquid obtained from washing is processed by the first filter 21 and the first heat exchanger 23 and then returned to the second scrubbing tower 20 to be reused as a spraying agent. Part of the liquid in the second scrubbing tower 20 enters the first scrubbing tower 10 to be used as a spraying agent.

[0065] The first mixture falls into the first washing tower 10. When it reaches the inclined portion 12 of the weir plate, the polyamide degradation product and a small amount of liquid slide down the surface of the inclined portion 12 of the weir plate to the bottom of the first washing tower 10. Most of the liquid falls onto the horizontal portion 11 through the through hole 12a of the inclined portion 12, and then flows into the water washing device 30 through the first liquid outlet for water washing treatment. At the same time, a small amount of liquid mixed with the polyamide degradation product enters the water washing device 30 through the bottom of the first washing tower 10 for water washing treatment. In the water washing device 30, some liquid material is returned to the first washing tower 10 after being processed by the second filter 31 and the second heat exchanger 33 and reused as a spraying agent.

[0066] The separation system of this utility model can quickly condense and cool steam and separate polyamide degradation products through the spray of the first washing tower. It can effectively separate steam from polyamide degradation products and transfer amine compounds into liquid, thus solving the environmental pollution problem caused by steam carrying a small amount of amine emissions.

[0067] The separation system of this utility model, through the setting of the weir plate, can retain a small amount of mud-like material in the first mixture on the weir plate, preventing it from depositing at the bottom of the first washing tower. This reduces the frequency of cleaning the solids at the bottom of the tower and the occurrence of bottom outlet blockage and insufficient pump suction caused by solid accumulation, which is conducive to the stable operation of the system.

[0068] Unless otherwise specified, the terms used in this utility model have the meanings commonly understood by those skilled in the art.

[0069] The embodiments described in this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Those skilled in the art can make various other substitutions, changes and improvements within the scope of this utility model. Therefore, this utility model is not limited to the above embodiments, but is only defined by the claims.

Claims

1. A separation system, characterized in that, The system includes a first washing tower, a second washing tower, and a water washing device; wherein, the first washing tower is used to wash the vapor containing polyamide degradation products to obtain a liquid first mixture and a gas; the water washing device is used to wash the liquid material discharged from the first washing tower; and the second washing tower is used to wash the gas. A weir plate is provided in the first washing tower. The weir plate includes a horizontal part and an inclined part. A plurality of through holes are provided on the inclined part. The inclined part is located between the top of the first washing tower and the horizontal part and is inclined relative to the horizontal part. Some liquid material falling from the top of the tower can fall to the horizontal part through the through holes.

2. The separation system according to claim 1, characterized in that, The weir plate is disposed on the side wall of the first washing tower; and / or, The horizontal portion is connected to the inclined portion; and / or Both the horizontal portion and the inclined portion are flat plates; and / or, The angle between the horizontal portion and the inclined portion is 40° to 50°; and / or The angle between the horizontal section and the height direction of the first washing tower is 85-90°.

3. The separation system according to claim 1, characterized in that, The height of the first washing tower is h, and the distance between the horizontal part of the weir plate and the bottom of the first washing tower is 1 / 5 to 1 / 4h; and / or, The angle between the horizontal section and the height direction of the first washing tower is 89-90°; and / or A first liquid outlet is provided on the side wall of the first washing tower, and the liquid material located on the horizontal part can be discharged from the first washing tower through the first liquid outlet.

4. The separation system according to claim 3, characterized in that, Along the height direction of the first washing tower, the first outlet is located between the horizontal section and the inclined section; and / or, The first liquid outlet is connected to the water washing device.

5. The separation system according to claim 1, characterized in that, It also includes a first filter and a first heat exchanger. The second scrubbing tower, the first filter, and the first heat exchanger are connected to each other to form a circulation path. The liquid mixture discharged from the second scrubbing tower can be returned to the second scrubbing tower after being processed by the first filter and the first heat exchanger; and / or, The separation system further includes a second filter and a second heat exchanger, the second filter being connected to the water washing device and the second heat exchanger, respectively.

6. The separation system according to claim 5, characterized in that, The second washing tower is provided with a third inlet and a third outlet, the third outlet being connected to the first filter and the third inlet being connected to the first heat exchanger; and / or, A fourth liquid outlet is provided on the second washing tower, and the fourth liquid outlet is connected to the first washing tower; and / or, The second heat exchanger is connected to the first washing tower.

7. The separation system according to claim 6, characterized in that, A first liquid inlet is provided on the first washing tower, and along the height direction of the first washing tower, the first liquid inlet is located between the top of the first washing tower and the weir plate; the fourth liquid outlet is connected to the first liquid inlet.

8. A scrubbing tower, characterized in that, The system includes a weir plate, which comprises a horizontal section and an inclined section. The inclined section has multiple through holes. The inclined section is located between the top of the washing tower and the horizontal section and is inclined relative to the horizontal section. Some liquid material falling from the top of the tower can fall into the horizontal section through the through holes.

9. The scrubbing tower according to claim 8, characterized in that, The weir plate is disposed on the side wall of the washing tower; and / or, The angle between the horizontal portion and the inclined portion is 40° to 50°; and / or The angle between the horizontal section and the height direction of the washing tower is 85° to 90°; and / or, A first liquid outlet is provided on the side wall of the washing tower, through which liquid material located on the horizontal section can be discharged from the washing tower.

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