CN216778413U - Depletion unit for low-temperature methanol washing - Google Patents
Depletion unit for low-temperature methanol washing Download PDFInfo
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- CN216778413U CN216778413U CN202220224147.9U CN202220224147U CN216778413U CN 216778413 U CN216778413 U CN 216778413U CN 202220224147 U CN202220224147 U CN 202220224147U CN 216778413 U CN216778413 U CN 216778413U
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Abstract
The utility model discloses a dilution unit for low-temperature methanol washing, which comprises a water separation tank, a methanol regeneration tower, a methanol-water separation tower and a controller, wherein a water phase outlet of the water separation tank is communicated with an inlet of the methanol-water separation tower, a gas phase outlet of the water separation tank is communicated with an inlet of the methanol washing tower, and a bottom outlet of the methanol washing tower is communicated with a CO (carbon monoxide) washing tower2Inlet of the desorption tower is communicated with CO2Bottom outlet of the stripper column and H2The inlet of the S concentration tower is communicated with H2The outlet of the S concentration tower is communicated with the inlet of the methanol regeneration tower; the top outlet of the methanol regeneration tower is communicated with the inlet of a water cooler, the outlet of the water cooler is communicated with a methanol reflux tank, and the bottom outlet of the methanol reflux tank is respectively communicated with the methanol regeneration towerIs communicated with a reflux opening of the methanol-water separation tower; the methanol separated in the methanol reflux tank and the poor methanol part filtered by the filter are sent into the methanol-water separation tower, so that the temperature of the top gas is reduced, and the water content in the methanol gas discharged from the top is ensured to reach the standard.
Description
The technical field is as follows:
the utility model relates to a dilution unit for low-temperature methanol washing, belonging to the field of chemical industry.
Background art:
the low-temperature methanol washing process is to utilize methanol to treat acid gas H in low-temperature and high-pressure environment2S、COS、CO2Etc.) have extremely high solubility to other components such as CH4CO and H2The process has the advantages of high gas purification degree and good selectivity, and the desulfurization and decarburization of the gas can be respectively and selectively carried out in the same process, thereby having wide application in the chemical industry.
The rich methanol of the acid gas absorbed by the low-temperature methanol washing needs to enter a subsequent depletion unit for depletion, namely the rich methanol after the washing change gas is sent into a water separation tank for gas-liquid separation, and the gas phase (mainly comprising CO and H) is2、CO2、H2S) is sent into a methanol washing tower, and lean methanol is utilized to absorb CO2、H2S, then sequentially feeding CO2Analytical column and H2CO removal in S concentration tower2And concentrating H2S, then sending the obtained product into a methanol regeneration tower, regenerating and removing acid gas, and obtaining poor methanol at the bottom of the tower; the water phase (mainly methanol and water) of the water separation tank is sent into a methanol-water separation tower for further separation of the methanol phase and the water phase, wastewater with the methanol content of less than 0.5 percent is obtained at the bottom of the tower, and methanol steam obtained at the top of the tower is sent into a methanol regeneration tower for treatment.
The methanol regeneration tower and the methanol-water separation tower are heated by a reboiler, and the problems exist,
1. the water phase separated by the water separation tank and fed into the methanol-water separation tower also comprises washing water in a tail gas washing tower (the tail gas washing tower is used for washing methanol in carbon dioxide vent gas), the treatment capacity is large, the components are unstable, the steam quantity of a reboiler needs to be increased for ensuring that the methanol content in the wastewater is less than 0.5 percent, but the increase of the steam quantity can cause the temperature at the top of the tower to rise, so that the water content in the methanol at the top of the methanol-water separation tower is increased, and the water is finally accumulated in poor methanol at the bottom of the tower after entering the methanol regeneration tower, so that the absorption capacity of the methanol is reduced, and the subsequent use and the product quality are influenced;
2. acid gas regenerated and removed by the methanol regeneration tower is discharged from the tower top and is exhausted after post-treatment, and gas discharged from the tower top also contains part of methanol, so that resource waste is caused.
The utility model has the following contents:
in order to solve the technical problem, the utility model aims to provide a depletion unit for low-temperature methanol washing.
The utility model is implemented by the following technical scheme: a dilution unit for low-temperature methanol washing is characterized by comprising a water separation tank, a methanol washing tower and CO2Analytical column, H2An S concentration tower, a methanol regeneration tower and a methanol-water separation tower,
the water phase outlet of the water separation tank is communicated with the inlet of the methanol-water separation tower, the gas phase outlet of the water separation tank is communicated with the inlet of the methanol washing tower, and the bottom outlet of the methanol washing tower is communicated with the CO2The inlet of the desorption tower is communicated with the CO2A bottom outlet of the stripping column and said H2The inlet of the S concentration tower is communicated with the H2The outlet of the S concentration tower is communicated with the inlet of the methanol regeneration tower;
the top outlet of the methanol regeneration tower is communicated with the inlet of a water cooler, the outlet of the water cooler is communicated with a methanol reflux tank, and the bottom outlet of the methanol reflux tank is respectively communicated with the reflux ports of the methanol regeneration tower and the methanol-water separation tower; the bottom outlet of the methanol regeneration tower is communicated with the inlet of the filter, and the outlet of the filter is communicated with the methanol recovery tank through a pipeline.
Furthermore, the outlet of the filter is communicated with the reflux port of the methanol-water separation tower through a pipeline.
The device further comprises a controller, a temperature sensor is arranged at an outlet at the top of the methanol-water separation tower, a first regulating valve is arranged on a pipeline communicated between the methanol reflux tank and the methanol-water separation tower, and a second regulating valve is arranged on a pipeline communicated between the filter and the methanol-water separation tower; the temperature sensor is in signal connection with the input end of the controller, and the output end of the controller is in signal connection with the first regulating valve and the second regulating valve.
The utility model has the advantages that:
1. the utility model realizes the recovery of the methanol by condensing and separating the acid gas removed from the top of the methanol regeneration tower and refluxing the methanol, thereby saving resources and reducing production cost.
2. The utility model realizes the cooling of the top gas by sending the methanol separated in the methanol reflux tank into the methanol-water separation tower, and in addition, the utility model also communicates the outlet of the filter with the reflux opening of the methanol-water separation tower, the poor methanol filtered by the filter is sent into the methanol-water separation tower for cooling, when the methanol of the filter is not enough to meet the requirement of cooling the top gas of the methanol-water separation tower, the methanol in the methanol reflux tank is sent into the methanol-water separation tower for cooling, thereby ensuring that the water content in the methanol gas discharged from the top reaches the standard.
3. The utility model is provided with a controller and a temperature sensor, the temperature of the outlet at the top of the methanol-water separation tower is monitored in real time by the temperature sensor, the controller is fed back in real time, and the opening degrees of a first regulating valve and a second regulating valve are controlled to realize the temperature regulation.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a depletion unit system for low temperature methanol washing according to this embodiment.
In the figure: the system comprises a water separation tank 1, a methanol regeneration tower 2, a methanol-water separation tower 3, a controller 4, a water cooler 5, a methanol reflux tank 6, a filter 7, a methanol recovery tank 8, a temperature sensor 9, a first regulating valve 10, a second regulating valve 11, a methanol washing tower 12, CO2 Analytical column 13, H2 S concentration column 14.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A dilution unit for low-temperature methanol washing comprises a water separation tank 1, a methanol regeneration tower 2, a methanol-water separation tower 3 and a controller 4,
the water phase outlet of the water separation tank 1 is communicated with the inlet of the methanol-water separation tower 3, the gas phase outlet of the water separation tank 1 is communicated with the inlet of the methanol washing tower 12, and the bottom outlet of the methanol washing tower 12 is communicated with the CO2The inlet of the desorption tower 13 is communicated with CO2Bottom outlet of the stripper column 13 and H2The inlet of the S concentration tower 14 is communicated with H2The outlet of the S concentration tower 14 is communicated with the inlet of the methanol regeneration tower 2;
the top outlet of the methanol regeneration tower 2 is communicated with the inlet of a water cooler 5, the outlet of the water cooler 5 is communicated with a methanol reflux tank 6, and the bottom outlet of the methanol reflux tank is respectively communicated with the reflux ports of the methanol regeneration tower 2 and the methanol-water separation tower 3; the outlet at the bottom of the methanol regeneration tower 2 is communicated with the inlet of a filter 7, and the outlet of the filter 7 is respectively communicated with the inlet of a methanol recovery tank 8 and the reflux port of the methanol-water separation tower 3 through pipelines;
a temperature sensor 9 is arranged at the top outlet of the methanol-water separation tower 3, a first regulating valve 10 is arranged on a pipeline communicated between the methanol reflux tank and the methanol-water separation tower 3, and a second regulating valve 11 is arranged on a pipeline communicated between the filter 7 and the methanol-water separation tower 3; the temperature sensor 9 is in signal connection with an input of the controller 4, and an output of the controller 4 is in signal connection with a first regulating valve 10 and a second regulating valve 11.
The working principle is as follows:
the shift gas is washed and absorbed by the sprayed methanol pumped by the poor methanol pump, the poor methanol which absorbs the acid gas is changed into rich methanol which firstly enters the water separation tank 1, and after the water phase and the gas phase are separated, the gas phase is sent into the methanol washing tower 12 from the top of the water separation tank 1 for sectional selective absorption. Absorb H2S and CO2The methanol-rich gas is decompressed to 0.24MPa and enters CO2The CO in the top of the desorption tower 13 is desorbed2The tail gas enters a tail gas washing tower to wash methanol, the methanol rich at the bottom of the tower is decompressed to 0.07MPa again and enters H2 S concentration column 14, small amount of CO at the top of the column2The tail gas enters the tail gas washing tower again to wash the methanol, and the tower bottom is rich in H2The rich methanol of S is sent to the methanol regeneration tower 2 after being pressurized by a pump. The methanol regeneration tower 2 is provided with a reboiler, the temperature of the regeneration tower is increased by increasing the steam dosage of 0.5MPa, the tower pressure is 0.26MPa, the tower top temperature is 87.5 ℃, the tower bottom temperature is 101.5 ℃, and the methanol steam at the tower top is cooled to 52 ℃ through a water cooler 5 and then enters a methanol reflux tank 6 for re-separation. The acid gas on the top of the methanol reflux tank 6 is sent to a sulfur recovery post for recovery, the methanol at the bottom of the tank is respectively sent to the upper parts of a methanol regeneration tower 2 and a methanol-water separation tower 3 through a pump, and the methanol at the bottom of the methanol regeneration tower 2 is pressurized by a filter 7 and then is respectively sent to a methanol recovery tank 8 and the methanol-water separation tower 3 through a pump.
The water phase in the water separation tank 1 is decompressed to 0.28MPa and then sent to a 15 th tray of the methanol-water separation tower 3. Washing the tower with tail gas to remove CO with 45 deg.C desalted water2Washing methanol carried in the vent gas, pumping the washed washing water into a 3-tower methanol-water separation tower, supplementing the temperature in the tower by a 1.0MPa reboiler, normally operating at 0.28MPa tower pressure, 140 deg.C tower bottom temperature, 95 deg.C tower top temperature, and 6.8m first regulating valve 10 in open state3H, controlling the top of the methanol-water separation column 3 by the methanol streamThe temperature is below 100 ℃. When the system is added or unstable, when the water phase of the water separation tank 1 is sent to excessive methanol/water, the steam consumption of the reboiler needs to be increased in order to maintain the tower temperature, at the moment, the tower top temperature rises to more than 100 ℃, the reflux methanol of the first regulating valve 10 needs to be opened for cooling, after the valve is fully opened, the tower top temperature still cannot be reduced, at the moment, the temperature sensor 9 and the controller 4 regulate the opening degree of the second regulating valve 11 to supplement the reflux amount, the tower top temperature is controlled, and the phenomenon that the poor methanol water content in the methanol regeneration tower exceeds the standard (the water content is less than 0.5%) is prevented due to the water carried by the methanol steam.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A dilution unit for low-temperature methanol washing is characterized by comprising a water separation tank, a methanol washing tower and CO2Analytical column, H2An S concentration tower, a methanol regeneration tower and a methanol-water separation tower,
the water phase outlet of the water separation tank is communicated with the inlet of the methanol-water separation tower, the gas phase outlet of the water separation tank is communicated with the inlet of the methanol washing tower, and the bottom outlet of the methanol washing tower is communicated with the CO2The inlet of the desorption tower is communicated with the CO2A bottom outlet of the stripping column and said H2The inlet of the S concentration tower is communicated with the H2The outlet of the S concentration tower is communicated with the inlet of the methanol regeneration tower;
the top outlet of the methanol regeneration tower is communicated with the inlet of a water cooler, the outlet of the water cooler is communicated with a methanol reflux tank, and the bottom outlet of the methanol reflux tank is respectively communicated with the reflux ports of the methanol regeneration tower and the methanol-water separation tower; the bottom outlet of the methanol regeneration tower is communicated with the inlet of the filter, and the outlet of the filter is communicated with the methanol recovery tank through a pipeline.
2. The dilution unit for low-temperature methanol washing according to claim 1, wherein the outlet of the filter is further communicated with the reflux port of the methanol-water separation tower through a pipeline.
3. The dilution unit of low-temperature methanol washing according to claim 2, further comprising a controller, wherein a temperature sensor is provided at a top outlet of the methanol-water separation column, a first regulating valve is provided on a pipe communicating between the methanol reflux tank and the methanol-water separation column, and a second regulating valve is provided on a pipe communicating between the filter and the methanol-water separation column; the temperature sensor is in signal connection with the input end of the controller, and the output end of the controller is in signal connection with the first regulating valve and the second regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220224147.9U CN216778413U (en) | 2022-01-26 | 2022-01-26 | Depletion unit for low-temperature methanol washing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220224147.9U CN216778413U (en) | 2022-01-26 | 2022-01-26 | Depletion unit for low-temperature methanol washing |
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| CN216778413U true CN216778413U (en) | 2022-06-21 |
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| CN202220224147.9U Active CN216778413U (en) | 2022-01-26 | 2022-01-26 | Depletion unit for low-temperature methanol washing |
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- 2022-01-26 CN CN202220224147.9U patent/CN216778413U/en active Active
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