JP2013248598A - Device and method for separating mixed gas - Google Patents

Abstract

Provided is a mixed gas separation device and method capable of reducing energy consumption required for separating at least one kind of gas such as CO ₂ from a mixed gas such as combustion exhaust gas and reducing the operating cost of the device. The purpose is to do.
A compression unit that compresses a mixed gas, a heat exchange unit that cools through a mixed gas that has been compressed by the compression unit and has risen in temperature, and the mixture that is compressed by the compression unit and cooled by the heat exchange unit A gas hydrate generator that reacts gas and water to generate a gas hydrate of at least one gas component contained in the mixed gas, and a gas-liquid separation located downstream of the gas hydrate generator The gas hydrate slurry that has exited from the gas hydrate generating unit absorbs heat of the mixed gas through the heat exchange unit, and the gas hydrate is decomposed to cause the gas-liquid separation. It is configured to enter the department.
[Selection] Figure 1

Description

  The present invention relates to a mixed gas separation device that hydrates and separates at least one gas component such as carbon dioxide contained in a mixed gas such as combustion exhaust gas, process gas, natural gas, biogas, synthesis gas, and the like, and It is about the method.

Hydrate separation method for separating the CO ₂ from the gas mixture by hydrate the carbon dioxide (CO ₂₎ in the mixed gas such as flue gas, is possible to perform the separation of CO ₂ by using only water It is the cleanest method in terms of being able to do it, and is attracting attention.

However, when CO ₂ gas hydrate is generated, it is necessary to increase the pressure of the mixed gas to high pressure and low temperature generation conditions and to cool it. Further, in order to recover the separated CO ₂ gas, the CO ₂ gas hydrate is decomposed (regasified), and it is necessary to supply heat of decomposition for the decomposition. Therefore, it consumes a lot of energy and tends to increase the operating cost.

In Patent Document 1, CO _{2 in} combustion exhaust gas is separated by hydrated, and the pressure energy generated when the separated CO ₂ gas hydrate is thermally decomposed and regasified to CO ₂ is gasified. An energy saving technique for recovery by a power recovery device such as an expansion is described.

US Published Patent No. 2007/0248527

However, conventionally, the heat generated by the compression when the mixed gas is compressed and pressurized until it satisfies the pressure of the conditions for generating CO ₂ gas hydrate has been removed by a refrigerator or the like. Driving a refrigerator or the like requires a lot of energy.
Further, in order to decompose the CO ₂ gas hydrate and re-gasify it into CO ₂ , it is necessary to supply the CO ₂ gas hydrate with heat energy for decomposition and heat it.
In view of the energy problem and the environmental problems resulting from the energy problem, further energy saving is required.

◆◆◆ Purpose ◆◆◆
The present invention relates to an apparatus and method for separating a mixed gas, which can reduce the energy consumed when separating at least one kind of gas such as CO ₂ from a mixed gas such as combustion exhaust gas, and can reduce the operating cost of the apparatus. The purpose is to provide.

  In order to achieve the above object, a mixed gas separation device according to a first aspect of the present invention includes a compression unit that compresses a mixed gas, and a heat exchange unit that cools through the mixed gas that has been compressed by the compression unit and has risen in temperature. And a gas hydrate that generates a gas hydrate of at least one gas component contained in the mixed gas by reacting the mixed gas compressed in the compression unit and cooled in the heat exchange unit with water. And a gas-liquid separation unit located downstream of the gas hydrate generation unit, and the gas hydrate slurry from the gas hydrate generation unit passes through the heat exchange unit and mixes the gas hydrate slurry. The gas hydrate is decomposed by absorbing the heat of the gas and enters the gas-liquid separation unit.

Here, “the gas hydrate of at least one kind of gas component contained in the mixed gas” means the gas hydrate of the one kind of gas when the separation target gas is one kind such as CO ₂ , and the like. In addition to the gas hydrates of the plurality of types of gases when the separation target gases are a plurality of types, the following gas hydrates are also used.
That is, there is only one type of gas to be separated, but other types of gas that are close to the phase equilibrium curve for gas hydrate generation are included together in the mixed gas, depending on the generation conditions. In addition to the gas hydrate of the separation target gas, a plurality of gas hydrates including both the separation target gas and the other type of gas may be generated. In the present invention, the plurality of gas hydrates is also included. Used in meaning.

◆◆◆ Explanation of action ◆◆◆
According to this aspect, the gas hydrate slurry discharged from the gas hydrate generating section passes through the heat exchanging section to cool the mixed gas that has been compressed by the compressing section and rises in temperature, thereby generating the gas hydrate. Reduce to lower temperature. This eliminates the need for a conventional refrigerator.
At the same time, the slurry itself passes through the heat exchanging portion, thereby absorbing the heat of the mixed gas and decomposing the gas hydrate in the slurry. Thereby, the heat of the mixed gas which has been compressed by the compression unit and has risen in temperature can be effectively used as the heat for gas hydrate decomposition. That is, a dedicated heat source for gas hydrate pyrolysis is not required.
The gas hydrate is decomposed to become a mixture of gas and water and enters the gas-liquid separation unit, where it is separated into gas and liquid water to be separated.
As described above, according to this aspect, it is possible to reduce the energy consumed when separating at least one kind of gas such as CO ₂ from the mixed gas, and to reduce the operating cost of the separation device.

  In the mixed gas separation device according to a second aspect of the present invention, in the first aspect, the compression section is composed of a plurality of units arranged in series with respect to the flow direction of the mixed gas, and the heat exchange The section is configured by a plurality corresponding to the plurality of compression sections, and the gas hydrate slurry is configured to enter the gas-liquid separation section through the plurality of heat exchange sections. It is characterized by that.

  According to this aspect, due to the serial arrangement structure of a plurality of compression sections and heat exchange sections, the second and subsequent compression sections from the most upstream with respect to the flow direction of the mixed gas enter the mixed gas after being cooled. Therefore, energy consumption required for gas compression can be reduced.

  In the mixed gas separation device according to a third aspect of the present invention, in the first aspect, the compression section is composed of a plurality of units arranged in parallel with respect to the flow direction of the mixed gas, and the heat exchange The section is configured by a plurality corresponding to the plurality of compression sections, and the gas hydrate slurry is configured to enter the gas-liquid separation section through the plurality of heat exchange sections. It is characterized by that.

  According to this aspect, when trouble occurs in the compression unit or the heat exchange unit of one row due to the parallel arrangement structure of the plurality of compression units and the heat exchange unit, the operation of the row is stopped and another operation is performed. The row operation can be continued. And the recovery operation | work of the row | line | column which produced the trouble can be performed, continuing the driving | operation of the said separation apparatus.

  According to a fourth aspect of the present invention, there is provided the mixed gas separation device according to the second aspect or the third aspect, wherein the gas hydrate slurry passes through each of the plurality of heat exchanging units individually. It is configured to enter the liquid separation unit.

  According to this aspect, since the gas hydrate slurry passes through each of the plurality of heat exchange units and enters the gas-liquid separation unit, the decomposition efficiency of the gas hydrate in the slurry is good. Further, it is possible to reduce a possibility that an unexpected situation occurs in which the gas hydrate adheres to the slurry flow path and blocks the flow path.

  The mixed gas separation device according to a fifth aspect of the present invention is the gas separation apparatus according to any one of the first aspect to the fourth aspect, wherein the water separated in the gas-liquid separation unit generates the gas hydrate. It can supply to the flow path between a part and the said heat exchange part, It is characterized by the above-mentioned.

The gas hydrate slurry from the gas hydrate generator increases the transport resistance and increases the pump load when the gas hydrate content increases.
According to this aspect, when the conveyance resistance is increased, the gas-liquid separated water can be sent to the slurry flow path. Thereby, the conveyance resistance of the flow path of the slurry is reduced by the diluting action of the gas-liquid separated water, and an increase in pump load can be prevented.
Further, since the water that has been gas-liquid separated absorbs heat at the heat exchanger and rises in temperature, the temperature can be used as part of the heat for decomposition of the gas hydrate in the slurry. Yes, there is no waste of energy.

  In the mixed gas separation device according to the sixth aspect of the present invention, in any one of the first aspect to the fifth aspect, the gas to be hydrated and separated is carbon dioxide. Features.

According to this aspect, when the mixed gas is combustion exhaust gas, carbon dioxide in the combustion exhaust gas can be reduced, so that the amount of carbon dioxide released into the atmosphere is reduced, contributing to prevention of global warming. be able to.
In addition, when the mixed gas contains useful gas components such as natural gas, biogas, and synthesis gas and non-useful gas components, carbon dioxide, which is a non-useful component, is separated and removed from the mixture gas. Purification can be performed.

  In the mixed gas separation device according to the seventh aspect of the present invention, the mixed gas according to any one of the first aspect to the fifth aspect is a mixed gas of a useful gas component and a non-useful gas component. The gas that is hydrated and separated is the non-useful gas component.

  According to this aspect, when the mixed gas includes a useful gas component such as natural gas, biogas, and synthesis gas and a non-useful gas component, the non-useful component is separated and removed from the mixture gas. Concentration and purification can be performed.

The method for separating a mixed gas according to the eighth aspect of the present invention includes a compression step of compressing the mixed gas, a cooling step of cooling the mixed gas after the compression step by heat exchange, and the compression and cooling. A gas hydrate generating step of reacting the mixed gas with water to generate a gas hydrate of at least one kind of gas component contained in the mixed gas, and generated in the gas hydrate generating step The gas hydrate slurry absorbs heat by heat exchange with the mixed gas, and the gas hydrate is decomposed and sent to a gas-liquid separation step.
According to this aspect, the same effect as that of the first aspect can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the energy consumption concerning the hydrate separation of at least one kind of gas contained in the mixed gas can be reduced, and the operating cost of the apparatus can be reduced.

It is a schematic block diagram which shows the separation apparatus of the mixed gas which concerns on Example 1 of this invention. It is a schematic block diagram which shows the separation apparatus of the mixed gas which concerns on Example 2 of this invention. It is a schematic block diagram which shows the separation apparatus of the mixed gas which concerns on Example 3 of this invention. It is a schematic block diagram which shows the separation apparatus of the mixed gas which concerns on Example 4 of this invention.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.
Example 1 which is one embodiment of the mixed gas separation device according to the present invention will be described with reference to FIG. In each of the following embodiments, the mixed gas is combustion exhaust gas and the separation target gas is carbon dioxide. However, the present invention is not limited to this.

[Example 1]
Mixing separator 1 of the gas of the present embodiment includes a compression unit 2 that compresses the mixed gas G _0, and the heat exchange unit 3 for cooling through the mixed gas G ₀ which is the temperature rise is compressed by the compression section 2, the compression Gas hydrate that generates CO ₂ gas hydrate of carbon dioxide contained in the mixed gas G ₀ by reacting the mixed gas G ₀ compressed in the unit 2 and cooled in the heat exchange unit 3 with water A generator 4 and a gas-liquid separator 5 located downstream of the gas hydrate generator 4 are provided.
Further, the CO ₂ gas hydrate slurry S exiting from the gas hydrate generator 4 absorbs the heat of the mixed gas G ₀ through the heat exchanging unit 3 and decomposes the CO ₂ gas hydrate. And is configured to enter the gas-liquid separator 5.

The mixed gas G ₀ such as combustion exhaust gas and process gas is usually at a high temperature of about 40 to 200 ° C. and contains a small amount of drainage such as water (steam), oil, ash, and dust. Therefore, the mixed gas G ₀ is cooled to a predetermined temperature (for example, about 40 ° C.) before being sent to the compression unit 2, and the drain is removed by a drain removing device (not shown) such as a mist separator, a cyclone, or a wet cleaning device. Is removed and sent to the compression unit 2.

The CO ₂ gas hydrate varies depending on the CO ₂ concentration in the mixed gas, but can usually be generated under conditions of 5 to 20 MPa and 0 to 4 ° C. The mixed gas G ₀ is boosted in the compression unit 2 and cooled in the heat exchange unit 3 to be sent to the gas hydrate generation unit 4 under the conditions for generating the CO ₂ gas hydrate.

  The gas hydrate generation step in the gas hydrate generation unit 4 can be performed by a known method such as a bubbling method in which fine bubbles are blown into water or a spray method in which water is sprayed into gas. In particular, the bubbling method is preferable because the gas-liquid contact efficiency is good and the target gas hydrate can be efficiently produced.

When CO ₂ gas hydrate is generated, 65.2 kJ of heat is generated per mol of CO ₂ . In order to prevent the temperature in the gas hydrate generator 4 from rising due to the generated heat and to maintain the gas hydrate generator 4 at a predetermined temperature (for example, about 4 ° C.), the gas hydrate generator 4 A flow path (not shown) for extracting and circulating the water inside is provided, and the extracted water is cooled at about 0 to 1 ° C. by, for example, a cooler (not shown).

In the gas hydrate generator 4, CO ₂ in the mixed gas G ₀ is hydrated to form a CO ₂ gas hydrate slurry S. The water content of the CO ₂ gas hydrate slurry S is preferably 50 to 95 wt%. By forming the CO ₂ gas hydrate, 50 to 95 vol% of the CO ₂ gas in the mixed gas G ₀ can be separated.

Further, in the gas hydrate generator 4, the remaining gas (hydrate of non gas) G ₁ after being generated a CO ₂ gas hydrate carbon dioxide of the mixed gas G in _0, the content of carbon dioxide The amount is reduced and discharged from the gas hydrate generator 4. This can reduce the amount of carbon dioxide released into the atmosphere and contribute to the prevention of global warming.

The CO ₂ gas hydrate slurry S generated in the gas hydrate generator 4 flows through the flow path 6 and is sent to the heat exchanger 3 by the pump 7. The slurry S absorbs the heat of the mixed gas G ₀ through the heat exchanging unit 3 and the CO ₂ gas hydrate is decomposed into carbon dioxide (CO ₂ gas) G ₂ and water W. CO ₂ gas hydrate decomposes when heated to about 10 ° C. The decomposition of CO ₂ gas hydrate is an endothermic reaction, and the water generated by the decomposition is about 10 to 15 ° C.
The carbon dioxide G ₂ and the water W enter the gas-liquid separator 5 through the flow path 8 and are separated into the carbon dioxide G ₂ and the water W.

Since the carbon dioxide G ₂ regasified by decomposition in the heat exchange unit 3 has a pressure at the time of decomposition of about 1 to 5 MPa, the pressure necessary for transporting the pipe flow path by a gas compressor (not shown) ( For example, the pressure is increased to 10 to 15 MPa) and transported. Alternatively it is also possible to carbon dioxide G ₂ that regasification is cooled and recovered as liquid carbon dioxide.
The water W separated by the gas-liquid separator 5 is cooled, for example, and returned to the gas hydrate generator 4 as raw water. The gas hydrate generator 4 is supplied with makeup water W ₀ that supplements the water consumed in the gas hydrate reaction.

Next, the operation of the first embodiment will be described.
According to the present embodiment, the CO ₂ gas hydrate slurry S exiting from the gas hydrate generation unit 4 passes through the heat exchange unit 3 and is compressed by the compression unit 2 to generate the mixed gas G ₀ whose temperature has increased. Cool and lower to a temperature under conditions for producing CO ₂ gas hydrate. Thereby, the conventional refrigerator is unnecessary.
At the same time, the slurry S itself passes through the heat exchanging unit 3 to absorb the heat of the mixed gas G ₀ and decompose the CO ₂ gas hydrate in the slurry S. Thus, CO as ₂ gas hydrate decomposition for the heat, said compressed by the compression section 2 can be effectively utilizing the heat of the mixed gas G ₀ which temperature has risen. That is, a dedicated heat source for CO ₂ gas hydrate thermal decomposition is not necessary.
The CO ₂ gas hydrate is decomposed to become a mixture of carbon dioxide G ₂ and water W and enters the gas-liquid separation unit 5, where it is separated into carbon dioxide G ₂ and liquid water W to be separated.

As described above, according to this embodiment, the energy consumption according to the time of the separation of carbon dioxide from mixed gas G ₀ is reduced, thereby reducing the operating costs of the separator.

[Example 2]
Example 2 which is another embodiment of the mixed gas separation device according to the present invention will be described with reference to FIG.
Separation device 21 of the mixed gas according to the present embodiment, the compression unit 2 is arranged in series with respect to the flow direction of the mixed gas G _0, in this embodiment the two first compressing unit 2a the 2 compression section 2b. The heat exchanging section 3 is also composed of two first heat exchanging sections 3a and second heat exchanging sections 3b corresponding to the two first compressing sections 2a and the second compressing sections 2b.

The CO ₂ gas hydrate slurry S is sent to the first heat exchange section 3a and the second heat exchange section 3b through the first flow path 6a and the second flow path 6b in which the flow path 6 is divided. Then, it warmed each CO ₂ gas hydrate in the first heat exchange unit 3a and the second heat exchanging portion 3b is decomposed, and the first flow path 8a become water W of carbon dioxide G ₂ and the liquid second It is configured to enter the gas-liquid separator 5 through the flow path 8b.

Also, the CO ₂ gas hydrate slurry S passes through the two first heat exchange units 3a and 2b individually as shown in FIG. It is configured to enter. In FIG. 2, reference numerals 9a and 9b denote open / close valves whose operations are controlled by a control unit (not shown).
Since the other configuration is the same as that of the first embodiment shown in FIG. 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the plurality of (two) first compression units 2a and second compression units 2b and the corresponding two first heat exchange units 3a and second heat exchange units 3b are arranged in series. , the second and subsequent from the most upstream with respect to the flow direction of the mixed gas G _0, to the present embodiment the second compression unit 2b, the temperature of the mixed gas G ₀ is raised is compressed by the first compressing unit 2a the 1 It is absorbed and cooled by the heat exchanger 2a. Therefore, energy consumption required for gas compression in the second compression unit 2b can be reduced.

Furthermore, according to the present embodiment, the CO ₂ gas hydrate slurry S passes through the two first heat exchange units 3a and the second heat exchange units 3b individually as shown in FIG. Since it is configured to enter the gas-liquid separator 5, the decomposition efficiency of the CO ₂ gas hydrate in the slurry S is good. In addition, it is possible to reduce a possibility that an unexpected situation occurs in which the CO ₂ gas hydrate adheres to the flow path of the slurry S and blocks the flow path.

[Example 3]
Example 3 which is still another embodiment of the mixed gas separation device according to the present invention will be described with reference to FIG.
Separator 31 of the gas mixture according to the present embodiment, the compression unit 2 is disposed in parallel to the flow direction of the mixed gas G _0, in this embodiment the two first compression section 2c first It is composed of two compression units 2d. The heat exchange unit 3 is also composed of two first heat exchange units 3c and a second heat exchange unit 3d corresponding to the two first compression units 2c and the second compression unit 2d.

3, reference numeral 10a, 10b show a flow passage in which the mixed gas _{G 0} is fed is branched into two. The first compression section 2c and the first heat exchange section 3c are provided in one flow path 10a, and the second compression section 2d and the second heat exchange section 3d are provided in the other flow path 10b. In FIG. 3, reference numerals 11a and 11b denote on-off valves whose operations are controlled by a control unit (not shown).

The CO ₂ gas hydrate slurry S is sent to the first heat exchange section 3c and the second heat exchange section 3d through the first flow path 6c and the second flow path 6d obtained by dividing the flow path 6. Then, the CO ₂ gas hydrate is decomposed by being heated by the first heat exchanging unit 3c and the second heat exchanging unit 3d, respectively, and becomes carbon dioxide G ₂ and liquid water W to form the first flow path 8c and the second flow path. It is configured to enter the gas-liquid separator 5 through the flow path 8d.

Further, the CO ₂ gas hydrate slurry S passes through the two first heat exchange units 3c and the second heat exchange unit 3d individually as shown in FIG. It is configured to enter. In FIG. 3, reference numerals 9c and 9d denote on-off valves whose operations are controlled by a control unit (not shown).
Since the other configuration is the same as that of the first embodiment shown in FIG. 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to the present embodiment, two first compression sections 2c and second compression sections 2d and corresponding two first heat exchange sections 3c and second heat exchange sections 3d are arranged in a single row. When trouble occurs in the compression section or heat exchange section, the operation of the row can be stopped and the operation of the other row can be continued. And the recovery operation | work of the row | line | column which produced the trouble can be performed, with the driving | operation of the said separator 31 continued.

[Example 4]
Example 4 which is still another embodiment of the mixed gas separation device according to the present invention will be described with reference to FIG.
The mixed gas separation device 41 according to the present embodiment has the same basic structure as that of the first embodiment shown in FIG. The differences are as follows.
The water W separated by the gas-liquid separation unit 5 can be supplied to the channel 6 between the gas hydrate generation unit 4 and the heat exchange unit 3 through the channel 12. In the figure, reference numeral 13 denotes an on-off valve whose operation is controlled by a control unit (not shown).

The CO ₂ gas hydrate slurry S from the gas hydrate generator 4 increases the transport resistance in the flow path 6 and increases the load on the pump 7 when the content of CO ₂ gas hydrate increases.
According to the present embodiment, when the conveyance resistance increases, a part of the water W separated into gas and liquid can be sent to the flow path 6 of the slurry S. Thereby, the conveyance resistance of the flow path 6 of the slurry S is reduced by the diluting action of the water W which has been gas-liquid separated, and an increase in the load of the pump 7 can be prevented.
Further, since the water W that has been gas-liquid separated absorbs heat at the heat exchange unit 3 and rises in temperature, the temperature is a part of the heat for decomposition of the CO ₂ gas hydrate in the slurry S. It can be used as a waste of energy.

In each of the above embodiments, the mixed gas is the combustion exhaust gas and the separation target gas is carbon dioxide. However, as described above, the present invention is not limited to this. Separating target gas to be separated from the mixed gas G ₀ can be separated methane, ethane, propane, butane, mixed gas G ₀ by hydrate of even hydrogen sulfide. It goes without saying that the pressure and temperature of the compression unit 2, the heat exchange unit 3, the gas hydrate generation unit 4 and the like are changed according to the gas components to be separated.

1 separation device of mixed gas, 2 compression part, 2a 1st compression part,
2b 2nd compression part, 2c 1st compression part, 2d 2nd compression part,
3 heat exchange part, 3a 1st heat exchange part, 3b 2nd heat exchange part,
3c 1st heat exchange part, 3d 2nd heat exchange part, 4 gas hydrate production | generation part,
5 Gas-liquid separation part, 6 Flow path, 6a 1st flow path, 6b 2nd flow path,
6c 1st flow path, 6d 2nd flow path, 7 pump, 8 flow path,
8a 1st flow path, 8b 2nd flow path, 8c 1st flow path, 8d 2nd flow path,
9a On-off valve, 9b On-off valve, 9c On-off valve, 9d On-off valve,
10a flow path, 10b flow path, 11a on-off valve, 11b on-off valve,
12 channel, 13 on-off valve, 21 mixed gas separation device,
31 Separating device for mixed gas, 41 Separating device for mixed gas,
G ₀ gas mixture, remaining gas after generating G ₁ gas hydrate,
G ₂ regasified carbon dioxide, S CO ₂ gas hydrate slurry,
W water, W ₀ makeup water

Claims (8)

A compression section for compressing the mixed gas;
A heat exchanging section that cools through the mixed gas that has been compressed by the compression section and that has risen in temperature;
A gas hydrate generator that generates a gas hydrate of at least one gas component contained in the mixed gas by reacting the mixed gas compressed by the compressing unit and cooled by the heat exchange unit with water. When,
A gas-liquid separator located downstream of the gas hydrate generator,
The slurry of the gas hydrate exiting from the gas hydrate generating unit absorbs the heat of the mixed gas through the heat exchanging unit so that the gas hydrate is decomposed and enters the gas-liquid separation unit. An apparatus for separating a mixed gas, comprising: The mixed gas separator according to claim 1,
The compression part is composed of a plurality arranged in series with respect to the flow direction of the mixed gas,
The heat exchanging section is composed of a plurality corresponding to the plurality of compression sections,
The gas hydrate slurry is configured to pass through each of the plurality of heat exchange units and enter the gas-liquid separation unit. The mixed gas separator according to claim 1,
The compression part is composed of a plurality arranged in parallel with the flow direction of the mixed gas,
The heat exchanging section is composed of a plurality corresponding to the plurality of compression sections,
The gas hydrate slurry is configured to pass through each of the plurality of heat exchange units and enter the gas-liquid separation unit. The mixed gas separation device according to claim 2 or 3,
The gas hydrate slurry is configured to enter the gas-liquid separation section through the plurality of heat exchanging sections individually. In the separation apparatus of the mixed gas as described in any one of Claim 1 to 4,
The water separated by the gas-liquid separation unit can be supplied to a flow path between the gas hydrate generation unit and the heat exchange unit. In the mixed gas separation device according to any one of claims 1 to 5,
An apparatus for separating a mixed gas, wherein the gas to be separated after being hydrated is carbon dioxide. In the mixed gas separation device according to any one of claims 1 to 6,
The mixed gas is a mixed gas of a useful gas component and a non-useful gas component,
An apparatus for separating a mixed gas, wherein the gas to be separated after being hydrated is the non-useful gas component. A compression step of compressing the mixed gas;
A cooling step of cooling the mixed gas after the compression step by heat exchange;
A gas hydrate generating step of reacting the compressed and cooled mixed gas with water to generate a gas hydrate of at least one gas component contained in the mixed gas;
The gas hydrate slurry generated in the gas hydrate generation step absorbs heat by heat exchange with the mixed gas, and the gas hydrate is decomposed and sent to a gas-liquid separation step. To separate the mixed gas.

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