CN214881194U - Methanol rectification extraction water transformation system - Google Patents
Methanol rectification extraction water transformation system Download PDFInfo
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- CN214881194U CN214881194U CN202121152474.XU CN202121152474U CN214881194U CN 214881194 U CN214881194 U CN 214881194U CN 202121152474 U CN202121152474 U CN 202121152474U CN 214881194 U CN214881194 U CN 214881194U
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Abstract
The utility model relates to the field of methanol rectification devices in a combined alcohol production process for synthetic ammonia, in particular to a methanol rectification extraction water transformation system; comprises a methanolizing device and a methanol rectifying device; the methanolizing device comprises a methanol synthesis tower, an inlet-outlet heat exchanger, a water cooler and a water washing tower which are sequentially connected through pipelines; the methanol rectifying device comprises a crude methanol tank, a pre-tower and a pressurizing tower which are sequentially connected through pipelines, wherein the top of the pre-tower is connected with a pre-tower reflux tank through a pipeline, and the top of the pressurizing tower is connected with a condensation reboiler through management; part of dilute methanol solution is led out from a liquid phase outlet of a water washing tower of a methylating device, and is stably conveyed to a reflux tank of a methanol rectification pre-tower through control of an adjusting valve after being metered to be used as an extractant, so that the stable supply of the extractant is realized; the dilute methanol solution produced by the bi-alcohol replaces the desalted water extractant, thereby reducing the consumption of desalted water, improving the concentration of crude methanol and reducing the rectification consumption.
Description
Technical Field
The utility model relates to a methanol rectification device field in the alcohol production process of synthetic ammonia, in particular to a methanol rectification extraction water transformation system.
Background
Ammonia synthesis plant for purifying ammonia synthesis feed gas (removing CO and CO in feed gas)2) And the part of processes adopts a double methanol process (methanolizing and methanation), so that a by-product crude methanol product can be produced while purifying the ammonia synthesis raw material gas. The methanol in the crude methanol produced by methanolizing adopts a mechanical separation device and is also subjected to water washing separation, the methanol solution obtained by the water washing separation has low concentration and high water content, and after being recycled to a crude methanol tank, the concentration of the crude methanol is reduced, and the steam consumption of methanol rectification is increased.
The methanol rectifying device is used for removing light components such as dimethyl ether and the like and other heavy components such as water, ethanol and the like in crude methanol produced by the methanol-methanol combination to produce high-purity refined methanol meeting the GB338-92 standard. In the crude methanol solution, small amounts of impurities which form an azeotrope with methanol and accumulate in the reflux drum are separated by extraction with the addition of a defined amount of desalted water in order to remove these impurities.
Disclosure of Invention
The utility model overcomes prior art's is not enough, a methanol rectification extract water transformation system, through increasing the UNICOM pipeline, will ally oneself with the diluted methanol solution of mellow wine production and replace the desalination extractant and use to reduce the consumption of demineralized water, improved the concentration of thick methyl alcohol simultaneously, reduced the rectification consumption.
For solving the technical problem, the utility model discloses the technical scheme who adopts does: a methanol rectification extraction water transformation system comprises a methanolizing device and a methanol rectification device; the methanol device comprises a methanol synthesis tower, an inlet and outlet heat exchanger, a water cooler and a water washing tower which are sequentially connected through pipelines, and a steam heater is connected between the inlet and outlet heat exchanger and the methanol synthesis tower through a pipeline; the methanol rectifying device comprises a crude methanol tank, a pre-tower and a pressurizing tower which are sequentially connected through a pipeline, the top of the pre-tower is connected with a pre-tower reflux groove through a pipeline, and the output end of the pre-tower reflux groove is communicated with the top of the pre-tower through a pipeline; the bottom of the pre-tower is connected with a pre-tower reboiler through a pipeline, and the output end of the pre-tower reboiler is communicated with the lower part of the pre-tower through a pipeline; the bottom of the pressurizing tower is connected with a pressurizing reboiler through a pipeline, and the output end of the pressurizing reboiler is communicated with the lower part of the pressurizing tower through a pipeline; the top of the pressurizing tower is connected with a condensation reboiler through management, and the output end of the condensation reboiler is communicated with the upper part of the pressurizing tower through a pipeline; the input end of the condensation reboiler is also connected with an atmospheric tower, the other output end of the condensation reboiler is also communicated with the input end of the atmospheric tower through a pipeline, the top of the atmospheric tower is connected with an atmospheric tower reflux tank through a pipeline, and the output end of the atmospheric tower reflux tank is communicated with the upper part of the atmospheric tower through a pipeline; the tops of the atmospheric tower reflux tank and the pressurizing tower are both connected with a product output pipeline and communicated with a finished product tank area; the water washing tower is also communicated with the crude methanol tank through a pipeline, and a liquid phase outlet of the water washing tower is also communicated with the pre-tower reflux groove through a pipeline.
The methylating device is a production process for synthesizing methanol by adopting water washing separation. The methanolizing process flow comprises the following steps: containing CO and CO2About 1% of raw gas enters an inlet-outlet heat exchanger to be heated to205 ℃, heating the mixture to 215 ℃ in a steam heater, then feeding the mixture into a heat-insulating fixed bed methanol synthesis tower, and introducing CO and CO in raw material gas in the methanol synthesis tower2And H2The reaction generates methanol, the gas after the reaction sequentially enters an inlet heat exchanger, an outlet heat exchanger and a water cooler, the temperature is reduced to be below 40 ℃, and then the gas enters a methanol washing tower, and the produced methanol is separated and sent to a methanol finished product tank area outside for storage; the process flow of the methanol rectifying device is as follows: crude methanol from the crude methanol tank enters the middle upper part of the pre-tower. And fractions such as methanol, MFOR, DME, water and non-condensable gas from the top of the pre-tower are condensed and cooled by the first pre-tower cooler and the second pre-tower cooler and then enter a pre-tower reflux groove, and are sent to the top of the pre-tower for reflux by a pre-tower reflux pump. The uncondensed light components and the uncondensed gas are separated by a gas-liquid separator and then sent to a three-waste furnace to be recycled as fuel. The pre-tower reflux tank can extract a small amount of light fraction to enter an isobutyl oil tank. The bottom of the pre-tower is methanol after ether removal. After the ether removal, the methanol is pressurized by a prognostic pump and then sent to the middle lower part of the pressurizing tower. The methanol steam from the top of the pressurizing tower enters a condensation reboiler for condensation, and the condensate enters a reflux tank and is sent to the top of the pressurizing tower for reflux through a reflux pump of the pressurizing tower. The bottom of the pressurizing tower is methanol water solution, and the methanol water solution enters the middle lower part of the atmospheric tower after being decompressed. And (3) extracting the refined methanol from the side line at the upper part of the pressurizing tower, cooling and then feeding the refined methanol into a refined methanol metering tank. The methanol vapor from the top of the atmospheric tower is condensed and cooled by a condenser of the atmospheric tower, enters a reflux tank, and the liquid phase is refluxed from the top of the atmospheric tower by a reflux pump of the atmospheric tower. And (3) extracting refined methanol from the reflux of the atmospheric tower, cooling the refined methanol by a cooler and then sending the refined methanol to a refined methanol metering tank. Part of dilute methanol solution is led out from a liquid phase outlet of a water washing tower of the methylating device and then is conveyed to a reflux groove of a methanol rectification pre-tower to be used as an extracting agent. Namely, a pipeline is laid at the liquid phase outlet of the methanol water washing tower to the inlet of the reflux tank of the methanol rectification pre-tower, so as to realize the stable supply of the extracting agent.
Compared with the prior art the utility model discloses following beneficial effect has:
the utility model discloses use rare methanol to replace methyl alcohol rectification desalination water extractant, the thick methyl alcohol of part of methylating device washing tower 5 does not get into thick methyl alcohol jar and mixes, has improved thick methyl alcohol concentration to the rectification expense of thick methyl alcohol has been reduced. Meanwhile, the methanol is conveyed to a methanol rectification pre-tower to replace a desalted water extracting agent, so that desalted water does not need to be specially provided, and the consumption of desalted water is reduced.
The utility model discloses the current apparatus for producing of make full use of, it is with low costs to reform transform, and construction cycle is short, and the construction difficulty is not high, does not need professional technical requirement, only need post staff and workshop management personnel familiar with environment, process flow and the equipment operating parameter after reforming transform can, realized adopting the rare methanol aqueous solution in the production to replace methyl alcohol rectification extractant, practiced thrift the desalinized water energy consumption, reduced the steam consumption of methyl alcohol rectification, gained better economic benefits.
Drawings
Fig. 1 is a schematic diagram of the system for reforming methanol rectification extract water of the utility model.
The figures are labeled as follows:
1-methanol tower, 2-steam heater, 3-inlet and outlet heat exchanger, 4-water cooler, 5-water washing tower, 6-crude methanol tank, 7-pre-tower, 8-pre-tower reflux tank, 9-pre-tower reboiler, 10-pressurizing tower, 11-pressurizing reboiler, 12-condensing reboiler, 13-atmospheric tower, 14-atmospheric tower reflux tank, 15-regulating valve, 16-flowmeter.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Examples
1. The utility model provides a methanol rectification extract water transformation system which characterized in that: comprises a methanolizing device and a methanol rectifying device; the methanol device comprises a methanol tower 1, an inlet and outlet heat exchanger 3, a water cooler 4 and a water washing tower 5 which are connected in sequence through pipelines, and a steam heater 2 is connected between the inlet and outlet heat exchanger 3 and the methanol tower 1 through a pipeline; the methanol rectifying device comprises a crude methanol tank 6, a pre-tower 7 and a pressurizing tower 10 which are sequentially connected through a pipeline, the top of the pre-tower 7 is connected with a pre-tower reflux tank 8 through a pipeline, and the output end of the pre-tower reflux tank 8 is communicated with the top of the pre-tower 7 through a pipeline; the bottom of the pre-tower 7 is connected with a pre-tower reboiler 9 through a pipeline, and the output end of the pre-tower reboiler 9 is communicated with the lower part of the pre-tower 7 through a pipeline; the bottom of the pressurizing tower 10 is connected with a pressurizing reboiler 11 through a pipeline, and the output end of the pressurizing reboiler 11 is communicated with the lower part of the pressurizing tower 10 through a pipeline; the top of the pressurizing tower 10 is connected with a condensation reboiler 12 through management, and the output end of the condensation reboiler 12 is communicated with the upper part of the pressurizing tower through a pipeline; the input end of the condensation reboiler 12 is further connected with an atmospheric tower 13, the other output end of the condensation reboiler 12 is further communicated with the input end of the atmospheric tower 13 through a pipeline, the top of the atmospheric tower 13 is connected with an atmospheric tower reflux tank 14 through a pipeline, and the output end of the atmospheric tower reflux tank 14 is communicated with the upper part of the atmospheric tower 13 through a pipeline; the tops of the atmospheric tower reflux tank 14 and the pressurizing tower 10 are both connected with a product output pipeline and communicated with a finished product tank area; the water washing tower 5 is also communicated with a crude methanol tank 6 through a pipeline, and a liquid phase outlet of the water washing tower 5 is also communicated with a pre-tower reflux groove 8 through a pipeline.
Furthermore, a regulating valve 15 is connected on a pipeline connecting the water washing tower 5 and the pre-tower reflux tank 8.
Furthermore, a flow meter 16 is connected to a pipeline connecting the water scrubber 5 and the pre-tower reflux tank 8, so that the extractant can be stably supplied.
Further, the bottom of the pressurizing tower 10 is connected with a wastewater treatment device through a pipeline.
The methylating device is a production process for synthesizing methanol by adopting water washing separation. The methanolizing process flow comprises the following steps: containing CO and CO2About 1% of raw material gas enters an inlet-outlet heat exchanger 3 to be heated to 205 ℃, enters a steam heater 2 to be heated to 215 ℃, enters an adiabatic fixed bed methanol synthesis tower 1, and CO in the raw material gas in the methanol synthesis tower 12And H2The reaction generates methanol, the gas after the reaction sequentially enters an inlet-outlet heat exchanger 3 and a water cooler 4, the temperature is reduced to be below 40 ℃, and then the gas enters a methanol washing tower 5, and the produced methanol is separated and sent to a methanol finished product tank area outside the world for storage; the process flow of the methanol rectifying device is as follows: crude methanol from the crude methanol tank 6 enters the upper middle part of the pre-tower 7. Fractions such as methanol, MFOR, DME, water and non-condensable gas from the top of the pre-tower 7 are condensed and cooled by the first pre-tower cooler and the second pre-tower cooler and then enter a pre-tower reflux tank 8, and are sent to the top of the pre-tower 7 by a pre-tower reflux pump to reflux. Uncondensed light components and no condensationThe gas is separated by a gas-liquid separator and then sent to a three-waste furnace to be recycled as fuel. The pre-tower reflux tank 8 can extract a small amount of light fraction to enter an isobutyl oil tank. The bottom of the pre-tower 7 is methanol after ether removal. After the ether removal, the methanol is pressurized by a prognostic pump and then sent to the lower middle part of the pressurizing tower 10. The methanol steam from the top of the pressurizing tower 10 enters a condensation reboiler 12 for condensation, and the condensate enters a reflux tank and is sent to the top of the pressurizing tower for reflux through a reflux pump of the pressurizing tower. The bottom of the pressurizing tower 10 is methanol water solution, and the methanol water solution enters the middle lower part of the atmospheric tower 13 after being decompressed. Refined methanol is extracted from the upper side line of the pressurizing tower 10, cooled and sent into a refined methanol metering tank. The methanol vapor from the top of the atmospheric tower 13 is condensed and cooled by the atmospheric tower condenser, and then enters the reflux tank 14, and the liquid phase is refluxed from the top of the tower by the atmospheric tower reflux pump. Refined methanol is extracted from the atmospheric tower 13 by reflux, and is sent to a refined methanol metering tank after being cooled by a cooler. Part of dilute methanol solution is led out from a liquid phase outlet of a water washing tower 5 of the methylating device and then is conveyed to a reflux groove 8 of a methanol rectification pre-tower to be used as an extracting agent. Part of dilute methanol solution is led out from a liquid phase outlet of a water washing tower of the methylating device and is stably conveyed to a reflux tank of a methanol rectification pre-tower through control of an adjusting valve after being measured to be used as an extracting agent. Namely, a pipeline is laid at the liquid phase outlet of the methanol water washing tower to the inlet of the reflux tank of the methanol rectification pre-tower, and an adjusting valve 15 and a flow meter 16 are added on the pipeline, so that the stable supply of the extracting agent is realized.
After transformation, part of crude methanol in the double-methanol process is not mixed with high-concentration methanol in a methanol separator, so that the concentration of the crude methanol is improved, and the crude methanol is conveyed to a methanol rectification pre-tower to replace a desalted water extracting agent, so that desalted water does not need to be specially provided, and the consumption of desalted water is reduced.
Claims (4)
1. The utility model provides a methanol rectification extract water transformation system which characterized in that: comprises a methanolizing device and a methanol rectifying device; the methanol device comprises a methanol tower (1), an inlet and outlet heat exchanger (3), a water cooler (4) and a water washing tower (5) which are sequentially connected through pipelines, and a steam heater (2) is connected between the inlet and outlet heat exchanger (3) and the methanol tower (1) through a pipeline; the methanol rectifying device comprises a crude methanol tank (6), a pre-tower (7) and a pressurizing tower (10) which are sequentially connected through a pipeline, the top of the pre-tower (7) is connected with a pre-tower reflux groove (8) through a pipeline, and the output end of the pre-tower reflux groove (8) is communicated with the top of the pre-tower (7) through a pipeline; the bottom of the pre-tower (7) is connected with a pre-tower reboiler (9) through a pipeline, and the output end of the pre-tower reboiler (9) is communicated with the lower part of the pre-tower (7) through a pipeline; the bottom of the pressurizing tower (10) is connected with a pressurizing reboiler (11) through a pipeline, and the output end of the pressurizing reboiler (11) is communicated with the lower part of the pressurizing tower (10) through a pipeline; the top of the pressurizing tower (10) is connected with a condensation reboiler (12) through management, and the output end of the condensation reboiler (12) is communicated with the upper part of the pressurizing tower through a pipeline; the input end of the condensation reboiler (12) is also connected with an atmospheric tower (13), the other output end of the condensation reboiler (12) is also communicated with the input end of the atmospheric tower (13) through a pipeline, the top of the atmospheric tower (13) is connected with an atmospheric tower reflux tank (14) through a pipeline, and the output end of the atmospheric tower reflux tank (14) is communicated with the upper part of the atmospheric tower (13) through a pipeline; the tops of the atmospheric tower reflux tank (14) and the pressurizing tower (10) are both connected with a product output pipeline and are communicated with a finished product tank area; the water washing tower (5) is also communicated with the crude methanol tank (6) through a pipeline, and a liquid phase outlet of the water washing tower (5) is also communicated with the pre-tower reflux groove (8) through a pipeline.
2. The methanol rectification extraction water reforming system of claim 1, which is characterized in that: and a regulating valve (15) is connected on a pipeline connecting the water washing tower (5) and the pre-tower reflux tank (8).
3. The methanol rectification extraction water reforming system of claim 2, wherein: and a flowmeter (16) is connected on a pipeline connecting the water washing tower (5) and the pre-tower reflux tank (8).
4. The methanol rectification extraction water reforming system of claim 2, wherein: the bottom of the pressurizing tower (10) is also connected with a wastewater treatment device through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121152474.XU CN214881194U (en) | 2021-05-27 | 2021-05-27 | Methanol rectification extraction water transformation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121152474.XU CN214881194U (en) | 2021-05-27 | 2021-05-27 | Methanol rectification extraction water transformation system |
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| CN214881194U true CN214881194U (en) | 2021-11-26 |
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