CN215962865U - Corrosion prevention device for methanol-water separation tower in low-temperature methanol system - Google Patents
Corrosion prevention device for methanol-water separation tower in low-temperature methanol system Download PDFInfo
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- CN215962865U CN215962865U CN202121236963.3U CN202121236963U CN215962865U CN 215962865 U CN215962865 U CN 215962865U CN 202121236963 U CN202121236963 U CN 202121236963U CN 215962865 U CN215962865 U CN 215962865U
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- water
- methanol
- tail gas
- water separation
- separation tower
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- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000926 separation method Methods 0.000 title claims abstract description 67
- 238000005536 corrosion prevention Methods 0.000 title claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 103
- 238000005406 washing Methods 0.000 claims abstract description 49
- 239000002351 wastewater Substances 0.000 claims abstract description 45
- 238000005260 corrosion Methods 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 19
- 230000008020 evaporation Effects 0.000 claims abstract description 19
- 238000011033 desalting Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Gas Separation By Absorption (AREA)
Abstract
The utility model belongs to the technical field of methanol separation, and relates to an anti-corrosion device of a methanol-water separation tower in a low-temperature methanol system, which comprises the methanol-water separation tower, a heat exchanger, a tail gas washing tower and CO2A flash unit; the tail gas washing tower is respectively provided with a tail gas inletA tail gas outlet, a desalted water inlet and a washing water outlet; the tail gas inlet is communicated with the tail gas outlet; the desalted water inlet is communicated with the washing water outlet; the outlet of the washing water passes through a heat exchanger and CO2The flash evaporation units are communicated; the waste water of the methanol-water separation tower is communicated with a desalted water inlet through a heat exchanger; CO 22The flash evaporation unit is respectively communicated with the methanol-water separation tower and the tail gas inlet, and CO is2The flash unit comprises a flash tank; the flash tank is respectively communicated with the heat exchanger, the methanol-water separation tower and the tail gas inlet. The method can effectively reduce carbon dioxide in the alcohol-containing water, reduce the acidity degree of the alcohol-containing water, prevent the corrosion of equipment pipelines, and ensure the stable operation and the production safety of the equipment.
Description
Technical Field
The utility model belongs to the technical field of methanol separation, relates to an anti-corrosion device for a methanol-water separation tower, and particularly relates to an anti-corrosion device for a methanol-water separation tower in a low-temperature methanol system.
Background
In the low-temperature methanol system, the methanol-water separation tower mainly plays the roles of removing water in methanol in the system and recovering a small amount of methanol in tail gas washing tower water. But because the main component of the tail gas is CO2The tail gas washing tower is used for washing tail gas by desalted water to form acidic alcohol-containing water, the alcohol-containing water is pressurized by a waste water pump and then is sent to a methanol-water separation tower to recover methanol in the alcohol-containing water after being subjected to heat exchange and temperature rise by a heat exchanger, and equipment and a pipeline are extremely easy to corrode because the methanol-water separation tower, the pipe orifice of the heat exchanger, an alcohol-containing water pipeline and a pipe fitting are all made of carbon steel, so that the equipment and the pipeline are in an acidic environment, the pipeline can be leaked due to long time, the equipment is damaged, the operation of the equipment is influenced, and production safety accidents are caused in serious cases.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problem that the existing methanol-water separation tower is easy to corrode, the utility model provides the anti-corrosion device for the methanol-water separation tower in the low-temperature methanol system, which can effectively reduce carbon dioxide in alcohol-containing water, reduce the acidity degree of the alcohol-containing water, prevent the corrosion of equipment pipelines and ensure the stable operation and the production safety of equipment.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the anticorrosion device of the methanol-water separation tower comprises the methanol-water separation tower, a heat exchanger, a tail gas washing tower and CO2A flash unit; the tail gas washing tower is respectively provided with a tail gas inlet, a tail gas outlet, a desalted water inlet and a washing water outlet; the tail gas inlet is communicated with the tail gas outlet; the desalted water inlet is communicated with the washing water outlet; the washing water outlet passes through a heat exchanger and CO2The flash evaporation units are communicated; the wastewater of the methanol-water separation tower is communicated with a desalted water inlet through a heat exchanger; the CO is2The flash evaporation unit is respectively communicated with the methanol-water separation tower and the tail gas inlet.
Further, said CO2The flash unit comprises a flash tank; the flash tank is respectively communicated with the heat exchanger, the methanol-water separation tower and the tail gas inlet.
Further, said CO2The flash unit further comprises a methanol water control valve arranged between the flash tank and the methanol water separation tower.
Further, said CO2The flash unit further comprises a flash vent valve disposed between the flash tank and the tail gas inlet.
Further, the anti-corrosion device of the methanol-water separation tower further comprises a washing water return valve arranged between the flash tank and the heat exchanger.
Furthermore, the methanol-water separation tower corrosion prevention device also comprises a waste water pump arranged between the heat exchanger and the washing water outlet.
Furthermore, the methanol-water separation tower anti-corrosion device also comprises a waste water control valve arranged between the heat exchanger and the desalted water inlet.
Further, the methanol-water separation tower anti-corrosion device also comprises a desalting water pipeline; a desalted water control valve is arranged on the desalted water pipeline; the desalting water pipeline is communicated with a desalting water inlet through a desalting water control valve; the desalination water control valve is communicated with the heat exchanger through the waste water control valve.
Further, the methanol-water separation tower anti-corrosion device also comprises a wastewater discharge pipeline; the waste water discharge pipeline is respectively communicated with the heat exchanger and the waste water control valve; and a wastewater discharge valve is arranged on the wastewater discharge pipeline.
The utility model has the beneficial effects that: the utility model arranges CO between the heat exchanger and the methanol-water separation tower2Flash unit to dissolve CO in the washing alcohol-containing water2Flashing at a pressure to flash off CO2The gas is merged into a tail gas pipeline, is washed by desalted water and then is discharged, and the alcohol-containing water after flash evaporation is sent to a methanol-water separation tower, thereby reducing CO in the water2The acidity degree of the alcohol-containing water is reduced, and equipment and pipelines are prevented from being corroded, so that the equipment can stably run, and the production safety is ensured.
Drawings
FIG. 1 is a schematic view of an anti-corrosion device of a methanol-water separation tower in a low-temperature methanol system provided by the utility model;
wherein:
c1605-methanol-water separation tower; LV 16106-methanol water control valve; d1609, a flash tank; PV16102 — flash vent valve; LV 16040-washing water return valve; e1623-heat exchanger; FV 16028-waste control valve; p1609-waste water pump; c1606 — tail gas wash column; LV16039 — waste water discharge valve; FV 16029-desalination water control valve.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Examples
Referring to fig. 1, the corrosion protection device for a methanol-water separation tower provided by this embodiment includes a methanol-water separation tower C1605, a heat exchanger E1623, a tail gas washing tower C1606, and CO2A flash unit; a tail gas inlet, a tail gas outlet, a desalted water inlet and a washing water outlet are respectively arranged on the tail gas washing tower C1606; the tail gas inlet is communicated with the tail gas outlet; the desalted water inlet is communicated with the washing water outlet; the outlet of the washing water passes through a heat exchanger E1623 and CO2The flash evaporation units are communicated; methanol-water separation column C1605, communicating the waste water with a desalted water inlet through a heat exchanger E1623; CO 22The flash evaporation unit is respectively communicated with the methanol-water separation tower C1605 and the tail gas inlet.
In this embodiment, a tail gas outlet is arranged at the top of the tail gas washing tower C1606 and used for emptying the washing tail gas; the upper part of the side is provided with a desalted water inlet; the middle part of the side of the tail gas inlet is provided with a tail gas inlet; the bottom of the washing machine is provided with a washing water outlet.
CO provided by this example2The flash unit comprises a flash tank D1609; the flash tank D1609 is respectively communicated with the heat exchanger E1623, the methanol-water separation tower C1605 and the tail gas inlet. CO 22The flash unit also includes a methanol water control valve LV16106 disposed between flash tank D1609 and methanol-water separation column C1605. CO 22The flash unit further comprises a flash vent valve PV16102 arranged between the flash drum D1609 and the off-gas inlet.
Specifically, on the flash tank D1609, a flash gas outlet is arranged at the top part, a flash alcohol-containing water outlet is arranged at the bottom part, and a flash waste water inlet is arranged at the side part; the heat exchanger E1623 is communicated with the flash evaporation wastewater inlet through a washing water liquid return valve LV 16040; the flash evaporation gas outlet is communicated with the tail gas inlet through a flash evaporation exhaust valve PV 16102; the flash evaporation alcohol-containing water outlet is communicated with a methanol-water separation tower C1605 through a methanol water control valve LV 16106.
In this embodiment, the washing water outlet is communicated with the heat exchanger E1623 through a waste water pump P1609, and the desalted water inlet is communicated with the heat exchanger E1623 through a waste water control valve FV 16028.
The anti-corrosion device for the methanol-water separation tower provided by the embodiment also comprises a desalting water pipeline; a desalted water control valve FV16029 is arranged on the desalted water pipeline; the desalted water pipeline is communicated with a desalted water inlet through a desalted water control valve FV 16029; the desalted water control valve FV16029 is communicated with a heat exchanger E1623 through a waste water control valve FV 16028.
The anti-corrosion device for the methanol-water separation tower provided by the embodiment also comprises a wastewater discharge pipeline; the waste water discharge pipeline is respectively communicated with a heat exchanger E1623 and a waste water control valve FV 16028; a waste water discharge valve LV16039 is arranged on the waste water discharge pipeline.
The corrosion prevention device for the methanol-water separation tower further comprises a tail gas pipeline, wherein the tail gas pipeline is communicated with a tail gas inlet; the flash evaporation gas outlet is converged with a tail gas pipeline through a flash evaporation exhaust valve PV16102 and then communicated with the tail gas inlet.
In this embodiment, the heat exchanger E1623 is of a plate type, wherein if the passage of the flash evaporation wastewater inlet on the washing water outlet through the wastewater pump P1609, the heat exchanger E1623, the washing water return valve LV16040 and the flash evaporation tank D1609 is set as a first branch (mainly washing water coming out of the tail gas washing tower C1606), and the passage of the methanol-water separation tower C1605, the heat exchanger E1623, the wastewater control valve FV16028 and the desalted water inlet is set as a second branch (mainly waste water coming out of the methanol-water separation tower C1605), the two branches travel different paths in the heat exchanger E1623 to exchange heat, and thus saving energy consumption of the system.
The methanol-water separation tower anti-corrosion device that this embodiment provided, its working process is:
after tail gas generated in the low-temperature methanol system is collected, the tail gas enters a tail gas washing tower C1606 from a tail gas pipeline through a tail gas inlet, a desalted water control valve FV16029 on a desalted water pipeline is opened, desalted water enters the tail gas washing tower C1606 through a desalted water inlet, and because the position of the desalted water inlet is higher than that of the tail gas inlet, the desalted water flows downwards in the tail gas washing tower C1606, the tail gas flows upwards in the tail gas washing tower C1606 and runs in a reverse direction, the desalted water washes methanol contained in the tail gas, and the washed tail gas is discharged from a tail gas outlet at the top; discharging washed alcohol-containing water from a washing water outlet at the bottom, feeding the alcohol-containing water into a heat exchanger E1623 through a waste water pump P1609, feeding the alcohol-containing water into a flash tank D1609 through a washing water return valve LV16040 after heat exchange and temperature rise, flashing the alcohol-containing water under the pressure of 0.4MPa, and carrying out flash evaporation on residual CO in the alcohol-containing water2Flash off, flash off 62.31% of CO2The gas and the methanol are discharged into a tail gas pipeline, and then enter a tail gas washing tower C1606 again, and after methanol in tail gas is washed by desalted water, the methanol is discharged from a tail gas outlet, so that the operation is continuously repeated, and CO in the alcohol-containing water is reduced2The content of the alcohol-containing water reduces the acidity degree of the alcohol-containing water, effectively prevents the corrosion of pipelines and equipment, and ensures the stable operation of production; the alcohol-containing water after flash evaporation passes through a methanol water control valve LV16106 enters a methanol-water separation tower C1605 from a flash tank D1609 to realize alcohol-water separation, the separated wastewater is discharged from the bottom of the methanol-water separation tower C1605 and enters a heat exchanger E1623 to exchange heat with washing water and cool, and then is divided into two paths, one path of wastewater is used as washing water through a wastewater control valve FV16028 and enters a tail gas washing tower C1606 from a desalted water inlet, and is recycled, and the other path of wastewater enters a wastewater discharge pipeline through a wastewater discharge valve LV16039 to be discharged; when the method is implemented, the wastewater discharge or the recycling is regulated and controlled according to the actual production.
Claims (9)
1. The utility model provides a methanol-water separation tower anticorrosion device which characterized in that: the anticorrosion device of the methanol-water separation tower comprises a methanol-water separation tower (C1605), a heat exchanger (E1623), a tail gas washing tower (C1606) and CO2A flash unit; the tail gas washing tower (C1606) is respectively provided with a tail gas inlet, a tail gas outlet, a desalted water inlet and a washing water outlet; the tail gas inlet is communicated with the tail gas outlet; the desalted water inlet is communicated with the washing water outlet; the outlet of the washing water passes through a heat exchanger (E1623) and CO2The flash evaporation units are communicated; the wastewater of the methanol-water separation tower (C1605) is communicated with a desalted water inlet through a heat exchanger (E1623); the CO is2The flash evaporation unit is respectively communicated with the methanol-water separation tower (C1605) and the tail gas inlet.
2. The methanol-water separation tower corrosion prevention device according to claim 1, characterized in that: the CO is2The flash unit comprises a flash tank (D1609); the flash tank (D1609) is respectively communicated with the heat exchanger (E1623), the methanol-water separation tower (C1605) and the tail gas inlet.
3. The methanol-water separation tower corrosion prevention device according to claim 2, characterized in that: the CO is2The flash unit further comprises a methanol water control valve (LV16106) disposed between the flash tank (D1609) and the methanol-water separation column (C1605).
4. The methanol-water separation column corrosion prevention device according to claim 3, characterized in that: the CO is2The flash unit further comprises a flash vent valve (PV16102) arranged between the flash tank (D1609) and the off-gas inlet.
5. The methanol-water separation tower corrosion prevention device according to claim 4, wherein: the methanol-water separation tower anti-corrosion device further comprises a washing water liquid return valve (LV16040) arranged between the flash tank (D1609) and the heat exchanger (E1623).
6. The methanol-water separation column corrosion prevention device according to any one of claims 2 to 5, characterized in that: the methanol-water separation tower anti-corrosion device further comprises a waste water pump (P1609) arranged between the heat exchanger (E1623) and the washing water outlet.
7. The methanol-water separation tower corrosion prevention device according to claim 6, characterized in that: the methanol-water separation tower anti-corrosion device further comprises a waste water control valve (FV16028) arranged between the heat exchanger (E1623) and the desalted water inlet.
8. The methanol-water separation column corrosion prevention device according to claim 7, characterized in that: the methanol-water separation tower anti-corrosion device also comprises a desalting water pipeline; a desalted water control valve (FV16029) is arranged on the desalted water pipeline; the desalted water pipeline is communicated with a desalted water inlet through a desalted water control valve (FV 16029); the desalted water control valve (FV16029) is communicated with the heat exchanger (E1623) through a waste water control valve (FV 16028).
9. The methanol-water separation column corrosion prevention device according to claim 8, characterized in that: the methanol-water separation tower anti-corrosion device also comprises a wastewater discharge pipeline; the waste water discharge pipeline is respectively communicated with a heat exchanger (E1623) and a waste water control valve (FV 16028); and a waste water discharge valve (LV16039) is arranged on the waste water discharge pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121236963.3U CN215962865U (en) | 2021-06-03 | 2021-06-03 | Corrosion prevention device for methanol-water separation tower in low-temperature methanol system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121236963.3U CN215962865U (en) | 2021-06-03 | 2021-06-03 | Corrosion prevention device for methanol-water separation tower in low-temperature methanol system |
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| Publication Number | Publication Date |
|---|---|
| CN215962865U true CN215962865U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121236963.3U Active CN215962865U (en) | 2021-06-03 | 2021-06-03 | Corrosion prevention device for methanol-water separation tower in low-temperature methanol system |
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| CN (1) | CN215962865U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117018819A (en) * | 2023-08-28 | 2023-11-10 | 中国神华煤制油化工有限公司 | Method and system for reducing water content of low-temperature methanol washing system |
-
2021
- 2021-06-03 CN CN202121236963.3U patent/CN215962865U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117018819A (en) * | 2023-08-28 | 2023-11-10 | 中国神华煤制油化工有限公司 | Method and system for reducing water content of low-temperature methanol washing system |
| CN117018819B (en) * | 2023-08-28 | 2025-03-11 | 中国神华煤制油化工有限公司 | A method and system for reducing water content in a low-temperature methanol washing system |
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