CN214781569U - Device for recovering methanol by coal-to-natural gas synthesis process - Google Patents
Device for recovering methanol by coal-to-natural gas synthesis process Download PDFInfo
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- CN214781569U CN214781569U CN202120382698.3U CN202120382698U CN214781569U CN 214781569 U CN214781569 U CN 214781569U CN 202120382698 U CN202120382698 U CN 202120382698U CN 214781569 U CN214781569 U CN 214781569U
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Abstract
A device that is used for coal system synthetic natural gas technology to retrieve methyl alcohol. High concentration H produced by low temperature methanol washing device2The acid gas of S contains more methanol, the acid gas containing the methanol can directly enter a hearth from a fire nozzle of a sulfur production combustion furnace to produce sulfur, and the methanol contained in the acid gas can be combusted to cause waste. The utility model comprises an acid gas washing tower (4) and an acid gas liquid separating tank (10), wherein an exhaust pipeline (17) at the top of the acid gas washing tower is communicated with an air inlet of the acid gas liquid separating tank, and the acid gas liquid separating tank is communicated with the exhaust pipelineThe liquid outlet at the bottom of the acid gas water scrubber is respectively communicated to a waste liquid pipeline (14) and a liquid inlet of the acid gas water scrubber through a circulating liquid pipeline (5), and the liquid inlet of the acid gas water scrubber is communicated with a desalted water supply pipeline (16). The utility model is used for the synthetic natural gas technology of coal system retrieves methyl alcohol.
Description
Technical Field
The utility model relates to a device for recovering methanol by a coal-based synthetic natural gas process.
Background
The low-temperature methanol washing methanol regeneration system for the coal-based synthetic natural gas project is mainly used for regenerating and recycling methanol rich in an H2S absorption tower and a CO2 absorption tower. The gas is mainly resolved through decompression flash evaporation, gas stripping and heating regeneration, the exhaust gas containing low-concentration H2S is washed by water and sent to a discharge barrel for discharge, and the acid gas containing high-concentration H2S is directly sent to a sulfur recovery system for treatment.
High concentration H produced by low temperature methanol washing device2The acid gas of S contains more methanol, the acid gas containing methanol and air are combusted in a sulfur-producing combustion furnace in proportion, and the hydrocarbon and ammonia are completely combusted by the air quantity. The elemental sulphur produced by the high temperature Claus and combustion reactions in the sulphur-making furnace is condensed to liquid sulphur. However, methanol contained in the acid gas is burned, resulting in a waste of resources.
Under the condition of certain temperature and pressure, the purpose of separating and recovering methanol in acid gas is realized by utilizing the different solubility of each component in the gas in water.
Disclosure of Invention
The utility model aims at providing a device that is used for coal system synthetic natural gas technology to retrieve methyl alcohol.
The above purpose is realized by the following technical scheme:
a device for recovering methanol by a coal-to-natural gas synthesis process comprises an acid gas washing tower and an acid gas liquid separating tank, wherein an exhaust pipeline at the top of the acid gas washing tower is communicated with an air inlet of the acid gas liquid separating tank, a liquid outlet at the bottom of the acid gas washing tower is respectively communicated to a waste liquid pipeline and a liquid inlet of the acid gas washing tower through a circulating liquid pipeline, and the liquid inlet of the acid gas washing tower is communicated with a desalted water liquid supply pipeline;
a liquid outlet of the acid gas liquid separation tank is respectively communicated to the circulating liquid pipeline and the waste liquid pipeline through a liquid discharge pipeline;
the waste liquid pipeline is communicated to the methanol regeneration system;
the exhaust port of the liquid separation tank is communicated to the sulfur production combustion furnace through an exhaust pipeline;
the circulating liquid pipeline is communicated with a sampling point.
The device for recovering the methanol by the coal-based synthetic natural gas process is characterized in that a circulating pump of a washing tower is installed on a circulating liquid pipeline, and a waste liquid pump is installed on a liquid discharge pipeline.
The device for recovering the methanol by the coal-based synthetic natural gas process is characterized in that an air inlet of the acid gas washing tower is respectively communicated with an air inlet pipeline of the main acid gas and an air inlet pipeline of the prewashing flash evaporation acid gas.
The device for recovering the methanol by the coal-based synthetic natural gas process is characterized in that liquid level sensors are arranged at the lower end of the acid gas washing tower and the acid gas liquid separation tank.
Has the advantages that:
1. the utility model discloses carry out the washing through the desalinized water with main acid gas and prewashing flash distillation acid gas through acid gas scrubbing tower, wash out the methyl alcohol that contains in the acid gas to the waste liquid in, the waste liquid washes regeneration system through low temperature methyl alcohol and carries out methyl alcohol regeneration, can carry out recycle, reduction production consumption to the methyl alcohol that contains in the acid gas.
2. The utility model discloses a desalinized water carries out the mode of washing to the acid gas and washes out methyl alcohol to the waste liquid in, can improve the rate of recovery of methyl alcohol.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
in the figure, 1, main acid gas, 2, prewashing flash evaporation acid gas, 3, an air inlet pipeline, 4, an acid gas water washing tower, 5, a circulating liquid pipeline, 6, a water washing tower circulating pump, 7, a sampling point, 8, a waste liquid pump, 9, a liquid discharge pipeline, 10, an acid gas liquid separation tank, 11, an exhaust pipeline, 12, a sulfur production combustion furnace, 13, a methanol regeneration system, 14, a waste liquid pipeline, 15, desalted water 16, a desalted water supply pipeline, 17, an air outlet pipeline, 18 and tower internals are included.
The specific implementation mode is as follows:
example 1:
a device for recovering methanol by a coal-based synthetic natural gas process comprises an acid gas washing tower 4 and an acid gas liquid separating tank 10, wherein a gas outlet pipeline 17 at the top of the acid gas washing tower is communicated with a gas inlet of the acid gas liquid separating tank, a liquid outlet at the bottom of the acid gas washing tower is respectively communicated to a waste liquid pipeline 14 and a liquid inlet of the acid gas washing tower through a circulating liquid pipeline 5, and the liquid inlet of the acid gas washing tower is communicated with a desalted water supply pipeline 16;
the liquid outlet of the acid gas liquid separation tank is respectively communicated to the circulating liquid pipeline 5 and the waste liquid pipeline 14 through a liquid outlet pipeline 9;
the waste liquid pipeline is communicated to the methanol regeneration system 13;
the exhaust port of the liquid separation tank is communicated to a sulfur production combustion furnace 12 through an exhaust pipeline 11;
and a sampling point 7 is communicated with the circulating liquid pipeline.
Example 2:
according to the device for recovering methanol in the process of synthesizing natural gas from coal in embodiment 1, the circulating liquid pipeline is provided with the circulating pump 6 of the water washing tower, and the liquid drainage pipeline is provided with the waste liquid pump 8.
Example 3:
according to the device for recovering methanol in the coal-to-natural gas synthesis process in the embodiment 1 or 2, the gas inlet of the acid gas water washing tower is respectively communicated with the gas inlet pipeline 3 of the main acid gas 1 and the pre-washing flash evaporation acid gas 2.
Example 4:
according to the device for recovering methanol in the process of synthesizing natural gas from coal in embodiment 1, 2 or 3, the lower end of the acid gas water washing tower and the acid gas liquid separation tank are both provided with liquid level sensors.
The acid gas washing tower is internally provided with tower internals 18 which comprise a liquid distribution device, a liquid collecting, redistributing, feeding and discharging device, a gas feeding and distribution device, a defoaming device and the like, and the mass transfer effect of the washing tower can be improved. The tray is in the form of a bubble cap, a float valve and the like, and the defoaming device is a mesh defoaming device, a baffle plate defoaming device and the like.
The working principle is that main acid gas and prewashing flash evaporation acid gas enter the lower part of an acid gas washing tower through an air inlet pipeline, desalted water enters the upper part of the acid gas washing tower through a desalted water supply pipeline, gas-liquid two phases in the washing tower are in reverse contact to remove methanol in the acid gas, the washed acid gas enters a liquid separating tank through an air outlet pipeline, the acid gas is discharged to a sulfur production combustion furnace through an acid gas liquid separating tank after gas-liquid separation through an exhaust pipeline, the separated liquid enters a waste liquid pipeline through a liquid discharge pipeline and is sent to a methanol regeneration system through a waste liquid pipeline, waste liquid after the acid gas washing tower is washed with water is discharged from the bottom of the acid gas washing tower and returns to the acid gas washing tower through a circulating liquid pipeline for recycling, the concentration of the methanol in the circulating liquid gradually rises along with the gradual rise of the liquid level of a tower kettle of the acid gas washing tower, and the liquid in the acid gas washing tower is discharged through a waste liquid pump, the circulating liquid pipeline and the waste liquid waste pipeline, the liquid level of the circulating liquid of the tower kettle of the acid gas water scrubber is supplemented through a desalted water supply pipeline, and the liquid level of the tower kettle of the acid gas water scrubber is controlled and adjusted through a liquid level control system. And (4) sending the waste liquid discharged from the tower bottom of the acid gas water washing tower to a methanol regeneration system for recycling methanol. In addition, the content of the methanol is analyzed through a sampling point of the circulating liquid pipeline, and the solubility of the circulating liquid is ensured to meet the absorption capacity of the circulating liquid on the methanol in the acid gas.
Claims (4)
1. The device for recovering the methanol by the coal-based synthetic natural gas process is characterized by comprising an acid gas washing tower and an acid gas liquid separating tank, wherein an exhaust pipeline at the top of the acid gas washing tower is communicated with an air inlet of the acid gas liquid separating tank, a liquid outlet at the bottom of the acid gas washing tower is respectively communicated to a waste liquid pipeline and a liquid inlet of the acid gas washing tower through a circulating liquid pipeline, and the liquid inlet of the acid gas washing tower is communicated with a desalted water liquid supply pipeline;
a liquid outlet of the acid gas liquid separation tank is respectively communicated to the circulating liquid pipeline and the waste liquid pipeline through a liquid discharge pipeline;
the waste liquid pipeline is communicated to the methanol regeneration system;
the exhaust port of the liquid separation tank is communicated to the sulfur production combustion furnace through an exhaust pipeline;
the circulating liquid pipeline is communicated with a sampling point.
2. The device for recovering the methanol by the coal-based synthetic natural gas process as claimed in claim 1, wherein a circulating pump of a washing tower is arranged on the circulating liquid pipeline, and a waste liquid pump is arranged on the liquid discharge pipeline.
3. The device for recovering the methanol by the coal-based synthetic natural gas process as claimed in claim 2, wherein the gas inlet of the acid gas water washing tower is respectively communicated with the gas inlet pipelines of the main acid gas and the prewashing flash evaporation acid gas.
4. The device for recovering the methanol by the coal-based synthetic natural gas process as claimed in claim 3, wherein liquid level sensors are arranged at the lower end of the acid gas water washing tower and the acid gas liquid separation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120382698.3U CN214781569U (en) | 2021-02-21 | 2021-02-21 | Device for recovering methanol by coal-to-natural gas synthesis process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120382698.3U CN214781569U (en) | 2021-02-21 | 2021-02-21 | Device for recovering methanol by coal-to-natural gas synthesis process |
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| Publication Number | Publication Date |
|---|---|
| CN214781569U true CN214781569U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120382698.3U Active CN214781569U (en) | 2021-02-21 | 2021-02-21 | Device for recovering methanol by coal-to-natural gas synthesis process |
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| Country | Link |
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| CN (1) | CN214781569U (en) |
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2021
- 2021-02-21 CN CN202120382698.3U patent/CN214781569U/en active Active
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