CN209848633U - Methanol washing and recovering device in methanol synthesis flash evaporation gas - Google Patents
Methanol washing and recovering device in methanol synthesis flash evaporation gas Download PDFInfo
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- CN209848633U CN209848633U CN201920473210.0U CN201920473210U CN209848633U CN 209848633 U CN209848633 U CN 209848633U CN 201920473210 U CN201920473210 U CN 201920473210U CN 209848633 U CN209848633 U CN 209848633U
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Abstract
The utility model discloses a methyl alcohol washing recovery unit in methyl alcohol synthesis flash distillation gas, remove fuel gas pipe network, thick methyl alcohol and remove methyl alcohol jar district and washing water pipe network, its characterized in that including flash tank, scrubbing tower, flash distillation gas: the flash tank comprises a gas-phase outlet arranged at the top end of the flash tank and a liquid-phase outlet arranged at the bottom end of the flash tank, the gas-phase outlet is connected with the flash gas-to-fuel gas pipe network, and the liquid-phase outlet is connected with the crude methanol-to-methanol tank region; the flash tank is connected with the washing tower through a pipeline, the top of the washing tower is connected with the flash gas-to-fuel gas pipe network through a pipeline, the bottom of the washing tower is connected with the crude methanol-removing tank area through a pipeline, and the washing water pipe network is connected with the washing tower through a pipeline; and a packing layer is arranged in the washing tower. This methyl alcohol washing recovery unit in methyl alcohol synthesis flash distillation gas, washing recovery effect is obvious, can retrieve the methyl alcohol of originally losing again, has reduced the loss of methyl alcohol and the waste of resource.
Description
Technical Field
The utility model relates to a coal chemical industry technical field especially relates to methyl alcohol washing recovery unit in methyl alcohol synthesis flash distillation gas.
Background
The coal-to-methanol production process is complex, and the main processes comprise a gasification process, a purification process, a methanol synthesis process, a rectification process and the like; the methanol synthesis process comprises the steps of reacting purified gas at a certain temperature, pressure and under the action of a catalyst to generate methanol, cooling, condensing and carrying out gas-liquid separation on the reacted gas to separate out liquid methanol, and carrying out flash evaporation on the liquid methanol to obtain a crude methanol product.
In the methanol synthesis process, the flash evaporation of crude methanol is an important process, and the purpose is to primarily separate light component impurities such as CO, H2, CO2 and DME dissolved in methanol by the principle of reduced pressure flash evaporation. The methanol flash evaporation gas is a gas phase component discharged after the crude methanol is subjected to reduced pressure flash evaporation, wherein a part of methanol liquid drops can be entrained. How to reduce the entrainment of methanol, reduce the loss of methanol along with gas phase components, and improve the gas-liquid separation efficiency and the methanol yield is also an important subject in the methanol synthesis process.
The methanol synthesis process comprises the step of reducing the loss of methanol along with gas phase components, and the step of improving the gas-liquid separation efficiency and the methanol recovery rate is obviously improved, wherein the methanol synthesis process comprises the university of eastern China (hereinafter referred to as Huali) is adopted, a horizontal methanol flash evaporation tank is adopted in a methanol flash evaporation system of the process, crude methanol is subjected to reduced pressure flash evaporation to separate H2, CO2 and other gases dissolved in the crude methanol, the entrained methanol liquid drops are separated from the flashed gas through a simple wire mesh demister, and then the flashed gas directly enters a fuel gas pipe network to be used as fuel gas or is discharged to a torch for combustion, but the unnecessary waste of methanol is caused due to the poor separation effect of the wire mesh demister, the methanol recovery rate is influenced, and the methanol in the flashed gas cannot be completely recycled.
Disclosure of Invention
To the problem that exists, the utility model aims at providing methanol washing recovery unit in methyl alcohol synthesis flash distillation gas, remove fuel gas pipe network, thick methyl alcohol and remove methyl alcohol jar district and washing water pipe network including flash tank, scrubbing tower, flash distillation gas.
In order to achieve the above object, the utility model adopts the following technical scheme: methanol washing recovery unit in methyl alcohol synthesis flash distillation gas, remove fuel gas pipe network, crude methyl alcohol and remove methyl alcohol tank district and washing water pipe network including flash tank, scrubbing tower, flash distillation gas, its characterized in that: the flash tank comprises a gas-phase outlet arranged at the top end of the flash tank and a liquid-phase outlet arranged at the bottom end of the flash tank, the gas-phase outlet is connected with the flash gas-to-fuel gas pipe network, and the liquid-phase outlet is connected with the crude methanol-to-methanol tank region; the flash tank is connected with the washing tower through a pipeline, the top of the washing tower is connected with the flash gas-to-fuel gas pipe network through a pipeline, the bottom of the washing tower is connected with the crude methanol-removing tank area through a pipeline, and the washing water pipe network is connected with the washing tower through a pipeline; and a packing layer is arranged in the washing tower.
Preferably, a flash tank pressure regulating valve is arranged between the gas phase outlet and a flash gas-to-fuel gas pipe network, and a flash tank liquid level regulating valve is arranged between the liquid phase outlet and the crude methanol-removing tank area.
Preferably, a washing water adjusting valve is disposed between the washing water pipe network and the washing tower.
Preferably, a flash tank pressure regulating valve is arranged between the gas phase outlet and the washing tower.
Preferably, a filtering and defoaming device is arranged at the top of the packing layer.
The utility model has the advantages that: compared with the prior art, the utility model discloses an improvement part lies in, adds a scrubbing tower in methyl alcohol flash tank gaseous phase export, and set up the packing layer in the scrubbing tower, add washing water in the packing layer, with flash tank gaseous phase export exhaust methyl alcohol through with packing layer reverse contact, absorption back, wash the flash distillation gas of flash tank export, can retrieve the methyl alcohol of originally discharging, practiced thrift the energy.
The design value and the measured mean value of the methanol content in the flash evaporation gas of the methanol flash evaporation system adopting the Hualiang synthesis device are compared as follows:
as can be seen from the comparison of the data, the methanol white loss of 6.21% still exists in the methanol flash evaporation system adopting the Huali synthesis device, so that the Huali synthesis flash evaporation system is necessary to be modified so as to recover the methanol in the methanol flash evaporation gas and reduce the methanol loss.
The comparison of the methanol content in the discharged gas before and after the methanol washing recovery device is installed in the methanol synthesis flash gas is as follows:
from the above table analysis data: after the methanol washing and recovering device in the methanol synthesis flash evaporation gas is implemented, the content of methanol in the directly discharged gas is reduced from 6.21% to 0.05%, and the quantity of the methanol recovered after transformation is as follows:
330×(6.21％-0.05％)＝20.33Nm3/h
20.33÷22.4×32＝29.04Kg/h
29.04×24＝696.9Kg
namely 696.9Kg of methanol can be recovered every day, the washing and recovery effect is obvious, and the expected effect is completely achieved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the filtering and defoaming device of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the technical solution of the present invention with reference to the accompanying drawings and embodiments.
Referring to the attached drawing 1, the methanol washing and recovering device in methanol synthesis flash evaporation gas comprises a flash evaporation tank 1, a washing tower 6, a flash evaporation gas-to-fuel gas pipe network 2, a crude methanol-to-methanol tank area 3 and a washing water pipe network 8, wherein the flash evaporation tank 1 comprises a gas phase outlet 11 arranged at the top end thereof and a liquid phase outlet 12 arranged at the bottom end thereof, the gas phase outlet 11 is connected with the flash evaporation gas-to-fuel gas pipe network 2, and the liquid phase outlet 12 is connected with the crude methanol-to-methanol tank area 3; the flash tank 1 is connected with the washing tower 6 through a pipeline, the top of the washing tower 6 is connected with the flash gas-to-fuel gas pipe network 2 through a pipeline, the bottom of the washing tower 6 is connected with the crude methanol-to-methanol tank area 3 through a pipeline, and the washing water pipe network 8 is connected with the washing tower 6 through a pipeline; the washing tower 6 is provided with a packing layer 61, and the washing water in the washing water pipe network 8 is desalted water (0.5-0.6 MPa, less than or equal to 40 ℃).
In order to adjust and control the gas pressure in the flash tank 1 and the washing tower 6 conveniently, a flash tank pressure regulating valve 4 is arranged between the gas phase outlet 11 and the flash gas discharging pipe network 2, and the flash tank pressure regulating valve 4 regulates and balances the pressure in the flash tank 1 to ensure that the pressure in the flash tank 1 is kept at a fixed value. A flash tank liquid level regulating valve 5 is arranged between the liquid phase outlet 12 and the crude methanol removal tank area 3, and is used for controlling the liquid drop amount of methanol liquid drops extracted from the flash tank 1 entering the crude methanol removal tank area 3.
In order to facilitate the control of the addition of the washing water, a washing water regulating valve 7 is arranged between the washing water pipe network 8 and the washing tower 6, and the washing water is added in a controlled manner according to the content of the methanol in the gas phase after washing in the packing layer 61.
In order to control the flash pressure of the flash tank 1 conveniently, a flash tank pressure regulating valve 4 is arranged between the gas phase outlet 11 and the washing tower 6, and the pressure of flash gas entering the washing tower 6 from the flash tank 1 through a pipeline is controlled by regulating the flash tank pressure regulating valve 4, so that the flash effect of the light component in the methanol flash tank is ensured.
In order to avoid liquid drops from being entrained in the gas after washing, the top of the packing layer 61 is provided with a filtering and defoaming device 62, the liquid drops entrained in the gas phase are removed through the filtering and defoaming device 62, and the liquid drops are prevented from being brought into the flash evaporation gas to the fuel gas pipe network 2.
The principle of the utility model is that: a washing tower 6 is arranged to recover the methanol which enters the flash steam to the fuel gas pipe network 2 or is sent to the torch combustion chamber along with the flash steam; a pipeline is arranged between the flash tank 1 and the flash gas-to-fuel gas pipe network 2 to guide the methanol gas to the washing tower 6 for washing and recovery, and the washed methanol liquid drops flow into the crude methanol-to-methanol tank area 3 from the bottom of the washing tower 6 for subsequent processing.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. Methanol washing recovery unit in methyl alcohol synthesis flash distillation gas, remove fuel gas pipe network (2), crude methyl alcohol and remove methyl alcohol jar district (3) and washing water pipe network (8) including flash tank (1), scrubbing tower (6), flash distillation gas, its characterized in that: the flash tank (1) comprises a gas phase outlet (11) arranged at the top end of the flash tank and a liquid phase outlet (12) arranged at the bottom end of the flash tank, the gas phase outlet (11) is connected with the flash evaporation gas-removing fuel gas pipe network (2), and the liquid phase outlet (12) is connected with the crude methanol-removing methanol tank area (3); the flash tank (1) is connected with the washing tower (6) through a pipeline, the top of the washing tower (6) is connected with the flash gas-to-fuel gas pipe network (2) through a pipeline, the bottom of the washing tower (6) is connected with the crude methanol-to-methanol tank area (3) through a pipeline, and the washing water pipe network (8) is connected with the washing tower (6) through a pipeline; a packing layer (61) is arranged in the washing tower (6).
2. The methanol washing and recovering device in methanol synthesis flash evaporation gas as claimed in claim 1, characterized in that: a flash tank pressure regulating valve (4) is arranged between the gas phase outlet (11) and the flash gas-removing fuel gas pipe network (2), and a flash tank liquid level regulating valve (5) is arranged between the liquid phase outlet (12) and the crude methanol-removing methanol tank area (3).
3. The methanol washing and recovering device in methanol synthesis flash evaporation gas as claimed in claim 2, characterized in that: a washing water adjusting valve (7) is arranged between the washing water pipe network (8) and the washing tower (6).
4. The methanol washing and recovering device in methanol synthesis flash evaporation gas as claimed in claim 3, characterized in that: a flash tank pressure regulating valve (4) is arranged between the gas phase outlet (11) and the washing tower (6).
5. The methanol washing and recovering device in methanol synthesis flash evaporation gas as claimed in claim 4, characterized in that: and a filtering and defoaming device (62) is arranged at the top of the packing layer (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920473210.0U CN209848633U (en) | 2019-04-10 | 2019-04-10 | Methanol washing and recovering device in methanol synthesis flash evaporation gas |
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| CN201920473210.0U CN209848633U (en) | 2019-04-10 | 2019-04-10 | Methanol washing and recovering device in methanol synthesis flash evaporation gas |
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| CN209848633U true CN209848633U (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577991A (en) * | 2021-06-29 | 2021-11-02 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
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2019
- 2019-04-10 CN CN201920473210.0U patent/CN209848633U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577991A (en) * | 2021-06-29 | 2021-11-02 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
| CN113577991B (en) * | 2021-06-29 | 2023-03-21 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
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