CN219897105U - Low-temperature methanol washing wastewater pretreatment device - Google Patents
Low-temperature methanol washing wastewater pretreatment device Download PDFInfo
- Publication number
- CN219897105U CN219897105U CN202321661272.7U CN202321661272U CN219897105U CN 219897105 U CN219897105 U CN 219897105U CN 202321661272 U CN202321661272 U CN 202321661272U CN 219897105 U CN219897105 U CN 219897105U
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- wastewater
- heat exchanger
- methanol
- pipeline
- outlet
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- 239000002351 wastewater Substances 0.000 title claims abstract description 102
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000005406 washing Methods 0.000 title claims abstract description 20
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 239000007791 liquid phase Substances 0.000 claims abstract description 22
- 239000010865 sewage Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Physical Water Treatments (AREA)
Abstract
The utility model belongs to the technical field of chemical wastewater treatment, and particularly discloses a low-temperature methanol washing wastewater pretreatment device which comprises a methanol-water separation tower, wherein a liquid phase outlet of the methanol-water separation tower is sequentially connected with a first cooling unit and a second cooling unit, the second cooling unit is a second heat exchanger, the first cooling unit is connected with a second wastewater inlet of the second heat exchanger through a pipeline, a desalted water inlet of the second heat exchanger is connected with a tail gas washing tower, and a second wastewater outlet of the second heat exchanger is communicated with a wastewater treatment device. According to the utility model, the wastewater at the liquid phase outlet of the methanol-water separation tower is cooled by the first cooling unit, then is introduced into the second heat exchanger for second cooling, the temperature of the wastewater after the two heat exchanges is finally lower than a preset value, and is discharged to the sewage treatment device from the second wastewater outlet of the second heat exchanger. By reducing the temperature of the wastewater, the long-period stable operation of the sewage treatment device is ensured.
Description
Technical Field
The utility model relates to the technical field of chemical wastewater treatment, in particular to a low-temperature methanol washing wastewater pretreatment device.
Background
In the operation process of the methanol-water separation tower, the temperature of the wastewater at the bottom of the methanol-water separation tower is about 128-133 ℃ and needs to be reduced by a heat exchanger, and then the wastewater is sent to a sewage treatment device for treatment; meanwhile, the contents of tar and impurities in the wastewater are higher, after the temperature of the feeding heater of the azeotropic tower is reduced, the impurities are condensed and agglomerated, so that the tube wall of the tube side of the feeding heater of the azeotropic tower is easily scaled and blocked, the heat exchange effect is poor, and the heat exchange efficiency is reduced.
The temperature of the waste water after heat exchange is about 60-75 ℃ and still higher than the preset temperature value of 47 ℃, if the waste water is directly sent to the sewage treatment device for treatment, the operation burden of the sewage treatment device can be increased due to the fact that the waste water temperature is too high, bacteria can grow, bacteria which can survive in a higher-temperature environment do not have the function of purifying sewage, water turbidity can be caused, meanwhile, the water pump and the fan of the sewage treatment device can be caused to be faulty due to the fact that the high-temperature waste water can seriously influence the stable operation of the sewage treatment device.
Disclosure of Invention
The utility model aims to provide a low-temperature methanol washing wastewater pretreatment device, which is used for solving the problems that the temperature reduction effect of wastewater with higher temperature generated by a methanol-water separation tower is not ideal, and the wastewater with higher temperature can cause the wastewater treatment device to not stably operate in the prior art.
In order to achieve the above purpose, the basic scheme provided by the utility model is as follows: the utility model provides a low temperature methanol-water washing pretreatment of water device, includes methanol-water separation tower, azeotropic tower and second heat exchanger, the liquid phase export of methanol-water separation tower is connected with the cooling unit that is used for carrying out preliminary cooling to the waste water that methanol-water separation water tower produced through the pipeline, first cooling unit is connected with the second waste water import and the azeotropic tower of second heat exchanger through the pipeline respectively, the liquid phase export of azeotropic tower (8) has third booster pump (9) through pipeline intercommunication, the export of third booster pump (9) is through pipeline and the liquid phase entry intercommunication of methanol-water separation tower (1), the desalted water import of second heat exchanger is connected with the tail gas scrubbing tower through the pipeline, the second waste water export of second heat exchanger is through pipeline and sewage treatment plant intercommunication.
The principle and the beneficial effects of the utility model are as follows: according to the utility model, the wastewater at the liquid phase outlet of the methanol-water separation tower is cooled by the cooling unit, then is introduced into the second heat exchanger for second cooling, desalted water at the outlet of the tail gas washing tower is selected as a heat exchange medium for cooling the wastewater, the temperature of the wastewater after the two heat exchanges is finally lower than a preset value, and the wastewater is discharged to the sewage treatment device from the second wastewater outlet of the second heat exchanger. By reducing the temperature of the wastewater, the long-period stable operation of the sewage treatment device is ensured.
The second scheme is a preferred scheme, the first cooling unit comprises a first heat exchanger and an extraction tank, the outlet of the methanol-water separation tower is communicated with a first booster pump, the outlet of the first booster pump is communicated with a first wastewater inlet of the first heat exchanger, the extraction tank is connected with a second booster pump through a pipeline, the outlet of the second booster pump is communicated with a methanol-water inlet of the first heat exchanger through a pipeline, and the methanol-water outlet and the first wastewater outlet of the first heat exchanger are respectively communicated with an azeotropic tower and a second wastewater inlet through pipelines;
the waste water discharged from the liquid phase outlet of the methanol-water separation tower is pumped into the first heat exchanger through the first booster pump, the temperature of the waste water is 128-133 ℃, methanol water at 38-43 ℃ at the outlet of the extraction tank is pumped into the first heat exchanger through the second booster pump and exchanges heat with the waste water, the temperature of the waste water after heat exchange is about 70 ℃ and is discharged from the first waste water outlet, and the waste water is sent into the second heat exchanger for secondary heat exchange.
A third aspect is the preference of the basic aspect, wherein a waste water pipeline is communicated with a pipeline close to the second waste water outlet of the second heat exchanger; the waste water subjected to twice heat exchange and cooling can be used for washing the raw gas through a waste water pipeline, and the waste water with lower temperature can be better used for cooling the raw gas.
A fourth aspect is the preference of the third aspect, wherein the waste water pipeline and the pipeline close to the sewage treatment device are respectively provided with a stop valve; by arranging two stop valves, when waste water is required to be used for washing raw gas, the stop valve on the waste water pipeline is opened, and the stop valve close to the sewage treatment device is closed, so that the second waste water outlet pipeline is communicated with the waste water pipeline, otherwise, the stop valve on the waste water pipeline is closed, and the stop valve close to the sewage treatment device is opened, so that the waste water is introduced into the sewage treatment device for treatment.
In a fifth aspect, the second aspect is preferable, and the pipelines near the first waste water outlet of the first heat exchanger and the second waste water outlet of the second heat exchanger are respectively provided with a bimetal thermometer; the temperature value of the wastewater at the liquid phase outlet of the methanol-water separation tower after the two cooling processes is conveniently monitored, so that the cooling effect of the wastewater after heat exchange is judged.
Drawings
Fig. 1 is a schematic diagram showing the front view structure of a low-temperature methanol washing wastewater pretreatment device according to the present utility model.
Detailed Description
The utility model is described in further detail below by way of specific embodiments:
reference numerals in the drawings of the specification include: 1. a methanol-water separation tower; 2. a first heat exchanger; 21. a first wastewater inlet; 22. a methanol water inlet; 23. a methanol water outlet; 24. a first waste water outlet; 3. a second heat exchanger; 31. a second wastewater inlet; 32. a desalted water inlet; 33. a second waste water outlet; 34. a desalted water outlet; 4. a stop valve; 5. an extraction tank; 6. a second booster pump; 7. a sewage treatment device; 8. an azeotropic column; 9. a third booster pump; 10. a first booster pump; 11. a waste water line; 12. a bimetal thermometer.
As shown in fig. 1: the utility model provides a low temperature methanol-water washing wastewater pretreatment device, including methanol-water separation tower 1, azeotropic tower 8 and second heat exchanger 3, first cooling unit includes first heat exchanger 2 and extraction tank 5, the liquid phase export of methanol-water separation tower 1 has first booster pump 10 through the pipeline connection, the export of first booster pump 10 and the first waste water import 21 of first heat exchanger 2 pass through the pipeline intercommunication, the waste water temperature of the liquid phase export of methanol-water separation tower 1 is 128-133 ℃, the liquid phase export of extraction tank 5 has second booster pump 6 through the pipeline intercommunication, the export of second booster pump 6 and the methanol water import 22 intercommunication of first heat exchanger 2, the methanol water temperature of extraction tank 5 liquid phase export is 38-43 ℃.
The methanol water outlet 23 and the first wastewater outlet 24 of the first heat exchanger 2 are respectively communicated with the liquid phase inlet of the azeotropic tower 8 and the second wastewater inlet 31 of the second heat exchanger 3 through pipelines, the liquid phase outlet of the azeotropic tower 8 is communicated with the third booster pump 9 through a pipeline, the outlet of the third booster pump 9 is communicated with the liquid phase inlet of the methanol-water separation tower 1 through a pipeline, the desalted water inlet 32 of the second heat exchanger 3 is communicated with the liquid phase outlet of the tail gas washing tower through a pipeline, the desalted water temperature of the desalted water inlet 32 of the second heat exchanger 3 is 3-7 ℃, and the second wastewater outlet 33 of the second heat exchanger 3 is communicated with the sewage treatment device 7 through a pipeline.
A pipeline close to the second wastewater outlet 33 of the second heat exchanger 3 is communicated with a wastewater pipeline 11, a pipeline close to the sewage treatment device 7 and the wastewater pipeline 11 are respectively provided with a stop valve 4, and desalted water is discharged through a desalted water outlet 34 of the second heat exchanger 3; the first waste water outlet 24 pipeline close to the first heat exchanger 2 and the second waste water pipeline 11 close to the second heat exchanger 3 are respectively provided with a bimetal thermometer 12, and the model of the bimetal thermometer 12 is WSS-411.
The implementation manner of this example is as follows: when the device is used, 128-133 ℃ high-temperature wastewater discharged from a liquid phase outlet of the methanol-water separation tower 1 is pressurized by the first booster pump 10 and enters the first heat exchanger 2 through a pipeline from a first wastewater inlet 21 of the first heat exchanger 2 to be subjected to first cooling, 38-43 ℃ methanol water output by a liquid phase outlet of the extraction tank 5 enters the first heat exchanger 2 through the second booster pump 6 to exchange heat with wastewater, the cooled wastewater reaches about 70 ℃, the cooled wastewater is discharged from a first wastewater outlet 24 of the first heat exchanger 2, enters the second heat exchanger 3 through a pipeline from a second wastewater inlet 31 of the second heat exchanger 3 to be subjected to second cooling, desalted water output from the liquid phase outlet of the tail gas washing tower enters the second heat exchanger 3 to exchange heat with wastewater, the temperature of the wastewater after heat exchange reaches about 40-50 ℃, a valve close to the sewage treatment device 7 is closed, a valve on a wastewater pipeline 11 is opened, the cooled wastewater is discharged from a second wastewater outlet 33 of the second heat exchanger 3 and is conveyed to the sewage treatment device 7, and meanwhile, the wastewater can be introduced into a raw water pipeline 11 for washing the wastewater through the wastewater pipeline 11.
The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (5)
1. The utility model provides a waste water pretreatment device is washed to low temperature methanol, its characterized in that, including methanol-water separation tower (1), azeotropic column (8) and second heat exchanger (3), the liquid phase export of methanol-water separation tower (1) is connected with the cooling unit that is used for carrying out preliminary cooling to the waste water that methanol-water separation tower (1) produced through the pipeline, the cooling unit is connected with second waste water import (31) and azeotropic column (8) of second heat exchanger (3) through the pipeline respectively, the liquid phase export of azeotropic column (8) is through pipeline intercommunication there is third booster pump (9), the export of third booster pump (9) is through pipeline and the liquid phase entry intercommunication of methanol-water separation tower (1), the demineralized water import (32) of second heat exchanger (3) are connected with the tail gas washing tower through the pipeline, the second waste water export (33) of second heat exchanger (3) are through pipeline and sewage treatment plant (7) intercommunication.
2. The low-temperature methanol washing wastewater pretreatment device according to claim 1, wherein the cooling unit comprises a first heat exchanger (2) and an extraction tank (5), an outlet of the methanol-water separation tower (1) is communicated with a first booster pump (10), an outlet of the first booster pump (10) is communicated with a first wastewater inlet (21) of the first heat exchanger (2), the extraction tank (5) is connected with a second booster pump (6) through a pipeline, an outlet of the second booster pump (6) is communicated with a methanol water inlet (22) of the first heat exchanger (2) through a pipeline, and a methanol water outlet (23) and a first wastewater outlet (24) of the first heat exchanger (2) are respectively communicated with an azeotropic tower (8) and a second wastewater inlet (31) through pipelines.
3. A low temperature methanol washing wastewater pretreatment device according to claim 1, characterized in that a line near the second wastewater outlet (33) of the second heat exchanger (3) is connected with a wastewater line (11).
4. A low temperature methanol washing wastewater pretreatment device according to claim 3, characterized in that the wastewater line (11) and the line near the wastewater treatment device (7) are respectively provided with a stop valve (4).
5. A low temperature methanol washing wastewater pretreatment device according to claim 2, characterized in that a bimetal thermometer (12) is arranged on the pipeline of the first wastewater outlet (24) close to the first heat exchanger (2) and the second wastewater outlet (33) of the second heat exchanger (3), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321661272.7U CN219897105U (en) | 2023-06-28 | 2023-06-28 | Low-temperature methanol washing wastewater pretreatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321661272.7U CN219897105U (en) | 2023-06-28 | 2023-06-28 | Low-temperature methanol washing wastewater pretreatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219897105U true CN219897105U (en) | 2023-10-27 |
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ID=88438277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321661272.7U Active CN219897105U (en) | 2023-06-28 | 2023-06-28 | Low-temperature methanol washing wastewater pretreatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219897105U (en) |
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2023
- 2023-06-28 CN CN202321661272.7U patent/CN219897105U/en active Active
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