KR20240084666A - Carbon dioxide liquefaction system using lng and method performing thereof - Google Patents

Abstract

A carbon dioxide liquefaction system using LNG according to an embodiment of the present invention has a first line that provides a path for transferring liquid carbon dioxide discharged from a storage tank, and gaseous carbon dioxide discharged from the storage tank is distributed in a distributor. When introduced, a second line provides a path for liquefying the gaseous carbon dioxide into liquid carbon dioxide and transferring it to a storage container, and the temperature of the gaseous carbon dioxide distributed and introduced from the distributor is increased through heat exchange with LNG. The path through which liquid carbon dioxide is transferred to a carbon dioxide storage container is provided by a third line and liquefied LNG is vaporized through heat exchange between the gaseous carbon dioxide and the gaseous carbon dioxide is liquefied. It includes a fourth line that provides a path through which gaseous LNG is used as fuel gas.

Description

Carbon dioxide liquefaction system using LNG and its implementation method {CARBON DIOXIDE LIQUEFACTION SYSTEM USING LNG AND METHOD PERFORMING THEREOF}

The present invention relates to a carbon dioxide liquefaction system using LNG and a method of implementing the same. More specifically, the present invention relates to a system for liquefying carbon dioxide emitted from ships using the cold heat of LNG supplied to the engine to correspond to changes in the load of the engine. It relates to a carbon dioxide liquefaction system using LNG and its implementation method.

Most ships use heavy fuel oil (HFO) as fuel due to the nature of high output requirements, and exhaust gases containing many harmful substances are discharged into the atmosphere.

Representative harmful substances among these exhaust gases include fine particles, nitrogen oxides, sulfur oxides, and carbon dioxide.

In particular, carbon dioxide is designated as a greenhouse gas that causes global warming. Although the global warming potential of carbon dioxide is lower than that of other greenhouse gases, it accounts for 80% of all greenhouse gas emissions and that emissions can be regulated. is important in

As a result, the IMO (International Maritime Organization) finally decided to introduce the Energy Efficiency Design Index (EEDI) indicator for new ships to be built in the future, reducing greenhouse gas emissions by an average of 30% compared to existing ships by 2025. We are in a situation where we have to reduce it.

Accordingly, there is a trend of changing from the existing HFO (Heavy Fuel Oil) and MDO (Marine Diesel Oil) to LNG (Liquefied Natural Gas).

However, using LNG as a fuel can satisfy regulations related to NOx and SOx, but it is difficult to satisfy regulations related to CO2 emissions (ship energy efficiency design index) that will be strengthened in the future.

Here, the Energy Efficiency Design Index (EEDI) is an index indicating fuel efficiency and is the amount of CO2 emitted when transporting 1 ton of cargo for 1 sea mile.

In particular, EEDI Phase 3 (average 30% reduction) will be applied as the ship energy efficiency design index from 2025. In response to this, one of the ways to reduce CO2 emissions is to collect and store CO2 from combustion gas.

One of these needs is an absorption method that captures carbon dioxide using an amine solution.

The existing system requires a separate refrigerant system to store and transport carbon dioxide emitted from carbon dioxide capture facilities used in power plants by compressing it to ultra-high pressure or to store it in a high-pressure liquid state.

If LNG is used as a refrigerant, the supply of cold source energy does not meet the energy required to liquefy carbon dioxide, so it is possible to vaporize a large amount of liquid LNG or only partially liquefy carbon dioxide.

Additionally, since the load of the engine is not constant, when liquefying CO2 using LNG, the engine fuel, a system that can liquefy carbon dioxide according to the changing load of the engine must be provided.

The purpose of the present invention is to provide a carbon dioxide liquefaction system using LNG and a method of implementing the same, which allows carbon dioxide emitted from ships to be liquefied in response to changes in the load of the engine using the cold heat of LNG supplied to the engine. .

In addition, the present invention liquefies carbon dioxide emitted from ships and carbon dioxide evaporated from liquefied carbon dioxide storage containers using LNG supplied to the engine, thereby liquefying carbon dioxide and vaporizing liquid LNG without the need for a separate refrigerant, thereby liquefying the engine. The purpose is to provide a carbon dioxide liquefaction system using LNG that can be supplied to and a method of implementing the same.

In addition, the present invention provides a carbon dioxide liquefaction system using LNG that can re-liquefy carbon dioxide generated in a carbon dioxide storage container using LNG supplied to the engine, thereby reducing operating costs with a highly efficient liquefaction system, and a method of implementing the same. The purpose is to provide

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

A carbon dioxide liquefaction system using LNG to achieve this purpose has a first line that provides a path for transferring the liquid carbon dioxide discharged from the storage tank, and when the gaseous carbon dioxide discharged from the storage tank is distributed and introduced from the distributor, A second line provides a path for liquefying the gaseous carbon dioxide into liquid carbon dioxide and transferring it to a storage container, and the gaseous carbon dioxide distributed and introduced from the distributor is in a liquid state whose temperature is raised through heat exchange with LNG. The path through which carbon dioxide is transferred to the carbon dioxide storage container is provided by a third line and the liquefied LNG is vaporized through heat exchange between the gaseous carbon dioxide and the gaseous carbon dioxide is liquefied into a gaseous state. It includes a fourth line that provides a path through which LNG is used as fuel gas.

In one embodiment, the second line may include a second compressor that pressurizes the gaseous carbon dioxide introduced from the distributor and a second precooler that lowers the temperature of the gaseous carbon dioxide introduced from the second compressor. there is.

In one embodiment, it may further include a sixth line that provides a path for supplying liquid carbon dioxide that has passed through the second precooler and liquid carbon dioxide transferred through the first line to a carbon dioxide storage container. .

In one embodiment, the third line and the fourth line vaporize the liquid LNG through heat exchange between the gaseous carbon dioxide distributed and introduced from the distributor and the liquid state LNG and convert the gaseous carbon dioxide into It may include an evaporator for liquefaction.

In one embodiment, the fourth line is a third compressor that boosts the liquid LNG gas to the required pressure of the engine, and the liquid LNG remaining after the liquid LNG compressed in the third compressor is vaporized through the evaporator. When LNG flows in, a first heat exchanger exchanges heat with gaseous carbon dioxide transported through the third line, and when liquid LNG remaining after vaporization in the first heat exchanger flows in, it exchanges heat with G/W to exchange heat with gaseous carbon dioxide. It may include a second heat exchanger that vaporizes LNG.

In one embodiment, the third line may include a pressure reducing valve that lowers the pressure of liquid carbon dioxide flowing from the first heat exchanger to a low temperature so that the liquid carbon dioxide is transferred to the storage container.

In addition, a method of implementing a carbon dioxide liquefaction system using LNG to achieve this purpose includes distributing carbon dioxide discharged from a storage tank and transferring it to a second line and a third line, and distributing carbon dioxide in a gaseous state distributed from the distributor. Liquefying carbon dioxide in a liquid state and transferring it to a storage container through the second line, the liquid carbon dioxide whose temperature is raised through heat exchange with the gaseous carbon dioxide distributed from the distributor and the liquid LNG is transferred to the third line transferring the LNG to a carbon dioxide storage container through a heat exchanger between the liquefied LNG and the gaseous carbon dioxide, and when the liquefied LNG is liquefied, the gaseous carbon dioxide is liquefied through a fourth line. and transferring LNG to a fuel gas storage device.

In one embodiment, the step of liquefying the gaseous carbon dioxide distributed from the distributor into liquid carbon dioxide and transferring it to a storage container through the second line is performed by pressurizing the gaseous carbon dioxide introduced from the distributor and then pressurizing the gaseous carbon dioxide. It may include lowering the temperature of the gaseous carbon dioxide and transferring it to a storage container through the second line.

In one embodiment, the method of supplying carbon dioxide liquefied fuel further includes transferring the liquid carbon dioxide of which the temperature has been lowered and the liquid carbon dioxide transferred through the first line to a carbon dioxide storage container through a sixth line. can do.

In one embodiment, the method of supplying carbon dioxide liquefied fuel vaporizes the liquid LNG through heat exchange between the gaseous carbon dioxide distributed and introduced from the distributor and the liquid LNG, and is transported through the fourth line. It may include liquefying gaseous carbon dioxide and transferring it to the third line.

In one embodiment, the carbon dioxide liquefied fuel supply method boosts the liquid LNG gas to the required pressure of the engine, and liquid LNG remaining after the liquid LNG compressed in the third compressor is vaporized through the evaporator. When introduced, heat exchange with gaseous carbon dioxide transported through the third line, and when liquid LNG remaining after vaporization in the first heat exchanger flows in, vaporizing the liquid LNG through heat exchange with G/W. may include.

In one embodiment, the step of lowering the pressure of the liquid carbon dioxide to a low temperature and transferring the liquid carbon dioxide to the storage container through a third line may be further included.

According to the present invention as described above, there is an advantage that carbon dioxide emitted from a ship can be liquefied in response to changes in the load of the engine using the cold heat of LNG supplied to the engine.

In addition, according to the present invention, carbon dioxide emitted from ships and carbon dioxide evaporated from liquefied carbon dioxide storage containers are liquefied using LNG supplied to the engine, thereby liquefying carbon dioxide and vaporizing LNG in a liquid state without requiring a separate refrigerant. It has the advantage of being able to supply power to the engine.

In addition, according to the present invention, carbon dioxide generated in a carbon dioxide storage container can be re-liquefied using LNG supplied to the engine, which has the advantage of lowering operating costs with a highly efficient liquefaction system.

Figure 1 is a block diagram for explaining a conventional carbon dioxide liquefaction system.
Figure 2 is a block diagram for explaining a carbon dioxide liquefaction system using LNG according to an embodiment of the present invention.
Figure 3 is a configuration diagram for explaining a carbon dioxide liquefaction system using LNG according to an embodiment of the present invention.
Figure 4 is a flow chart to explain an embodiment of a carbon dioxide liquefaction system using LNG according to the present invention.

The above-described objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Figure 1 is a block diagram for explaining a conventional carbon dioxide liquefaction system.

Referring to Figure 1, the carbon dioxide liquefaction system includes an LNG tank 20, an LCO2 tank 20, a carbon dioxide capture system 30, a gas engine 40, a fuel supply system 50, and a CO2 liquefaction system 60. do.

The LNG tank 20 stores LNG fuel in a liquid state for use during the operation of the ship. The LNG fuel stored in the LNG tank 20 is supplied to the gas engine 40 through the fuel supply system 50.

Liquid carbon dioxide is stored in the LCO2 tank 20, and the liquid carbon dioxide is provided to the CO2 liquefaction system 60.

The gas engine 40 uses LNG fuel and air supplied from the fuel supply system 50 to propel the ship and emits high-temperature combustion gas. At this time, the combustion gas discharged from the gas engine 40 is one or more of nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and water (H2O).

The fuel supply system 50 supplies LNG flowing from the LNG tank 20 to the gas engine 40.

The conventional carbon dioxide liquefaction system described above requires a separate refrigerant system to store and transport carbon dioxide emitted from carbon dioxide capture equipment used in power plants by compressing it to ultra-high pressure or to store it in a high-pressure liquid state.

If LNG is used as a refrigerant, the supply of cold source energy does not meet the energy required to liquefy carbon dioxide, so only vaporization of a large amount of liquid LNG or partial liquefaction of gaseous carbon dioxide is possible.

Additionally, since the load of the gas engine 40 is not constant, when liquefying CO2 using LNG, which is the fuel of the engine, a system that can liquefy carbon dioxide according to the changing load of the engine must be provided.

Figure 2 is a block diagram for explaining a carbon dioxide liquefaction system using LNG according to an embodiment of the present invention.

Referring to FIG. 2, the carbon dioxide liquefaction system using LNG includes an LNG tank 100, an LCO2 tank 200, a carbon dioxide capture system 300, a gas engine 400, and a carbon dioxide liquefied fuel supply system 500.

The LNG tank 100 stores LNG fuel in a liquid state for use during the operation of the ship. In order to use this liquid LNG fuel as ship fuel, the liquid LNG fuel is vaporized and used as LNG fuel gas for ship propulsion. At this time, LNG in liquid state has cold heat.

Liquid carbon dioxide is stored in the LCO2 tank 200, and the liquid carbon dioxide is supplied to the carbon dioxide liquefied fuel supply system 500.

The carbon dioxide capture system 300 captures carbon dioxide from combustion gas discharged from the gas engine 400.

The gas engine 400 uses supplied LNG fuel and air to propel the ship and emits high-temperature combustion gas. At this time, the combustion gas discharged from the gas engine 11 is one or more of nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and water (H2O).

The carbon dioxide liquefied fuel supply system 500 liquefies carbon dioxide discharged from the carbon dioxide capture system 300 through LNG in the LNG tank 100.

First, the carbon dioxide liquefied fuel supply system 500 pressurizes the gaseous carbon dioxide discharged from the carbon dioxide capture system 300 to the pressure required in the storage tank. Thereafter, the carbon dioxide liquefied fuel supply system 500 cools the temperature of the gaseous carbon dioxide and stores the liquid carbon dioxide in the storage tank. At this time, liquid carbon dioxide and gaseous carbon dioxide may exist in the storage tank.

The carbon dioxide liquefied fuel supply system 500 distributes carbon dioxide in the gaseous state among the carbon dioxide in the storage tank, liquefies the carbon dioxide in the gaseous state into liquid carbon dioxide and stores it back in the storage tank, or performs heat exchange with LNG to liquefy the carbon dioxide. Afterwards, it is stored in a carbon dioxide storage container.

First, the carbon dioxide liquefied fuel supply system 500 will explain the process of liquefying gaseous carbon dioxide into liquid carbon dioxide and storing it back in the storage tank.

The carbon dioxide liquefied fuel supply system 500 pressurizes carbon dioxide in a gaseous state. As described above, when gaseous carbon dioxide is compressed, the pressure increases and the temperature rises at the same time, changing the gaseous carbon dioxide into liquid carbon dioxide.

Thereafter, the carbon dioxide liquefied fuel supply system 500 lowers the temperature of the gaseous carbon dioxide and then performs heat exchange between the liquid LNG and the gaseous carbon dioxide. Accordingly, the gaseous carbon dioxide is liquefied by the cold heat of the liquid state LNG, and the liquid state LNG is vaporized by the heat of the gaseous carbon dioxide.

As described above, the present invention can reduce the cost required to obtain the cold heat necessary for cooling carbon dioxide by liquefying carbon dioxide using LNG cold heat.

The carbon dioxide liquefied fuel supply system 500 depressurizes the liquid carbon dioxide and transfers it to a storage container, and performs heat exchange between the gaseous LNG and the incoming G/W. That is, the carbon dioxide liquefied fuel supply system 500 performs heat exchange between the gaseous LNG and the incoming G/W in consideration of the case where the amount of liquid carbon dioxide supplied is insufficient to increase the temperature of the LNG.

Figure 3 is a configuration diagram for explaining a carbon dioxide liquefaction system using LNG according to an embodiment of the present invention.

Referring to FIG. 3, the carbon dioxide liquefied fuel supply system 500 includes a storage tank 510, a first compressor 511, a first pre-cooler 512, a distributor 513, an evaporator 514, and a second compressor ( 515), a second pre-cooler 516, a first heat exchanger 517, a pressure reducing valve 518, a third compressor 519, and a second heat exchanger 520.

The storage tank 510 stores carbon dioxide introduced through a fifth line (L5) that transfers carbon dioxide discharged from the collection facility and a third line (L3) that liquefies gaseous carbon dioxide into liquid carbon dioxide. Carbon dioxide stored in the storage tank 510 is transferred to the first line (L1) or distributed through the distributor 513 and transferred to the second line (L2) and the third line (L3).

First, the storage tank 510 is connected to a fifth line (L5) that transfers carbon dioxide discharged from the capture facility. The fifth line (L5) provides a path to change gaseous carbon dioxide discharged from the collection facility into liquid carbon dioxide and transfer it to the storage tank 510. A first compressor 511 and a first pre-cooler 512 are formed in the fifth line L5.

The first compressor 511 pressurizes the gaseous carbon dioxide discharged from the collection facility to the pressure required by the storage tank 510. The temperature of the gaseous carbon dioxide introduced through the first compressor 511 decreases as it passes through the first free cooler 512, and the liquid carbon dioxide whose temperature has decreased is stored in the storage tank (LCO2).

The first pre-cooler 512 cools the gaseous carbon dioxide introduced from the first compressor 511 and supplies the liquid carbon dioxide to the storage tank 510.

Additionally, carbon dioxide stored in the storage tank 510 is transferred to the first line (L1). The first line (L1) provides a path for transferring liquid carbon dioxide discharged from the carbon dioxide storage tank 510 to the carbon dioxide storage container (LCO2).

Additionally, carbon dioxide stored in the storage tank 510 is distributed through the distributor 513 and transferred to the second line (L2) and the third line (L3). To this end, when gaseous carbon dioxide flows in from the storage tank 510, the distributor 513 distributes the gaseous carbon dioxide to each of the second line (L2) and the third line (L3).

The second line (L2) provides a path to liquefy the gaseous carbon dioxide distributed from the distributor 513 into liquid carbon dioxide and transfer it back to the storage tank 510.

In the third line (L3), gaseous carbon dioxide distributed from the distributor 513 performs heat exchange with LNG through the evaporator 514, and liquid carbon dioxide with an increased temperature is transferred to the carbon dioxide storage container (LCO2). Provides a route to do so.

Hereinafter, the second compressor 515, the second free cooler 516, the first heat exchanger 517, and the pressure reducing valve 518 formed in the second line L2 will be described.

The second compressor 515 pressurizes the gaseous carbon dioxide distributed from the distributor 513. At this time, when gaseous carbon dioxide is compressed through the second compressor 515, the pressure increases and the temperature increases at the same time.

The second pre-cooler 516 lowers the temperature of gaseous carbon dioxide flowing in from the second compressor 515 and then supplies it to the first heat exchanger 517 of the fourth line (L4).

The first heat exchanger 517 performs heat exchange between LNG in a liquid state transported through the fourth line L4 and carbon dioxide in a gaseous state through the second pre-cooler 516. The temperature of the gaseous carbon dioxide passing through the first heat exchanger 517 will decrease and the temperature of the liquid LNG will increase.

Therefore, the first heat exchanger 517 liquefies gaseous carbon dioxide using the cold heat of the liquid LNG and vaporizes the liquid LNG using the heat of the carbon dioxide. As described above, the present invention liquefies gaseous carbon dioxide using the cold heat of liquid LNG, thereby reducing the cost required to obtain the cold heat necessary for cooling carbon dioxide.

Liquid carbon dioxide that has passed through the first heat exchanger 517 is transferred to the pressure reducing valve 518 through the second line (L2), and gaseous LNG is transferred to the second heat exchanger ( 520).

The pressure reducing valve 518 lowers the pressure of the liquid carbon dioxide that has passed through the first heat exchanger 517 to a low temperature, thereby turning the liquid carbon dioxide into the storage container 510.

Hereinafter, the evaporator 514 formed in the third line L3 will be described.

The evaporator 514 vaporizes the liquid LNG using the gaseous carbon dioxide distributed from the distributor 513. The temperature of the gaseous carbon dioxide passing through the evaporator 514 increases, and the gaseous carbon dioxide changes into liquid carbon dioxide.

The liquid carbon dioxide that has passed through the evaporator 514 is fused with the liquid carbon dioxide discharged from the carbon dioxide storage tank 510 of the first line (L1) and is transferred to the carbon dioxide storage container (LCO2).

In the fourth line (L4), LNG is vaporized through the evaporator 514, and the remaining LNG is raised to the required temperature of the engine through a heat exchanger and is transferred to the gas storage tank 510.

Hereinafter, the third compressor 519, the evaporator 514, the first heat exchanger 517, and the second heat exchanger 520 formed in the fourth line L4 will be described.

The third compressor 519 boosts the liquid LNG gas to the required pressure of the engine. At this time, when the LNG is boosted through the third compressor 519, the pressure increases and the temperature increases at the same time.

When liquid LNG compressed through the third compressor 519 is introduced, the evaporator 514 vaporizes the liquid LNG using gaseous carbon dioxide transported through the third line L3.

At this time, the temperature of the gaseous carbon dioxide passing through the evaporator 514 increases, and the gaseous carbon dioxide changes into liquid carbon dioxide. Afterwards, the liquid carbon dioxide is transferred through the second line (L2), and the vaporized remaining liquid LNG is transferred through the fourth line (L4).

The first heat exchanger 517 performs heat exchange between LNG in a liquid state and carbon dioxide in a gaseous state through the second free cooler 516. The temperature of the gaseous carbon dioxide passing through the first heat exchanger 517 will decrease and the temperature of the liquid LNG will rise to the required temperature of the engine.

Accordingly, the gaseous carbon dioxide is liquefied by the cold heat of the liquid state LNG, and the liquid state LNG is vaporized by the heat of the gaseous carbon dioxide. Accordingly, liquid carbon dioxide is transferred through the third line L3, and liquid LNG remaining after being vaporized is transferred to the second heat exchanger 520.

When the gaseous LNG that has passed through the first heat exchanger 517 is introduced, the second heat exchanger 520 performs heat exchange between the gaseous LNG and the incoming G/W. That is, considering the case where the amount of liquid carbon dioxide supplied is insufficient, heat exchange is performed between liquid LNG and incoming G/W in the second heat exchanger 520, and liquid LNG is vaporized into fuel gas. may be used.

Figure 4 is a flow chart to explain an embodiment of a carbon dioxide liquefaction system using LNG according to the present invention.

Referring to FIG. 4, in step S410, carbon dioxide discharged from the storage tank is distributed in a distributor and transferred to the second line and the third line (step S410).

In step S420, the gaseous carbon dioxide distributed from the distributor is liquefied into liquid carbon dioxide and transferred to a storage container through the second line.

In step S430, the carbon dioxide liquefied fuel supply system undergoes heat exchange with the gaseous carbon dioxide and liquid LNG distributed from the distributor, and the liquid carbon dioxide, whose temperature has been raised, is transferred to the carbon dioxide storage container through the third line.

In step S440, the liquefied LNG is vaporized through heat exchange between the liquefied LNG and the gaseous carbon dioxide, and when the gaseous carbon dioxide is liquefied, the gaseous LNG is transferred to the fuel gas storage device through the fourth line. is transported.

Although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations can be made by those skilled in the art from these descriptions. Accordingly, the spirit of the present invention should be understood only by the scope of the claims set forth below, and all equivalent or equivalent modifications thereof shall fall within the scope of the spirit of the present invention.

100: LNG tank,
200: LCO2 tank,
300: carbon dioxide capture system,
400: gas engine,
500: Carbon dioxide liquefied fuel supply system
510: storage tank,
511: first compressor,
512: first pre-cooler,
513: distributor,
514: Evaporator
515: second compressor,
516: second pre-cooler,
517: first heat exchanger
518: pressure reducing valve,
519: third compressor,
520: Second heat exchanger

Claims (12)

A first line providing a path for transporting liquid carbon dioxide discharged from the storage tank;
When the gaseous carbon dioxide discharged from the storage tank is distributed and introduced from the distributor, a second line provides a path for liquefying the gaseous carbon dioxide into liquid carbon dioxide and transferring it to a storage container;
A third line providing a path through which the gaseous carbon dioxide distributed and introduced from the distributor undergoes heat exchange with LNG and the temperature of the liquid carbon dioxide is transferred to a carbon dioxide storage container; and
When the liquefied LNG is vaporized through heat exchange between the gaseous carbon dioxide and the gaseous carbon dioxide is liquefied, it includes a fourth line that provides a path through which the gaseous LNG is used as fuel gas. characterized by
Carbon dioxide liquefaction system using LNG.
According to paragraph 1,
The second line is
a second compressor that pressurizes gaseous carbon dioxide introduced from the distributor; and
Characterized in that it includes a second precooler that lowers the temperature of gaseous carbon dioxide flowing from the second compressor.
Carbon dioxide liquefaction system using LNG.
According to paragraph 2,
Characterized in that it further comprises a sixth line that provides a path for supplying the liquid carbon dioxide that has passed through the second precooler and the liquid carbon dioxide transferred through the first line to a carbon dioxide storage container.
Carbon dioxide liquefaction system using LNG.
According to paragraph 1,
The third and fourth lines are
Characterized in that it comprises an evaporator that vaporizes the liquid LNG and liquefies the gaseous carbon dioxide through heat exchange between the gaseous carbon dioxide distributed and introduced from the distributor and the liquid state LNG.
Carbon dioxide liquefaction system using LNG.
According to clause 4,
The fourth line is
A third compressor that boosts the liquid LNG gas to the required pressure of the engine;
A first heat exchanger that exchanges heat with gaseous carbon dioxide transferred through the third line when the remaining liquid LNG is introduced after the liquid LNG compressed in the third compressor is vaporized through the evaporator; and
When the liquid LNG remaining after being vaporized in the first heat exchanger is introduced, it comprises a second heat exchanger that vaporizes the liquid LNG through heat exchange with G/W.
Carbon dioxide liquefaction system using LNG.
According to clause 5,
The third line is
Characterized in that it includes a pressure reducing valve that lowers the pressure of the liquid carbon dioxide flowing from the first heat exchanger to a low temperature to transfer the liquid carbon dioxide to the storage container.
Carbon dioxide liquefaction system using LNG.
A step of distributing carbon dioxide discharged from the storage tank in a distributor and transferring it to a second line and a third line;
liquefying the gaseous carbon dioxide distributed from the distributor into liquid carbon dioxide and transferring it to a storage container through the second line;
Transferring the liquid carbon dioxide, whose temperature has been raised through heat exchange with the gaseous carbon dioxide distributed from the distributor and the liquid LNG, to a carbon dioxide storage container through a third line; and
When the liquefied LNG is vaporized through heat exchange between the gaseous carbon dioxide and the gaseous carbon dioxide is liquefied, the gaseous LNG is transferred to a fuel gas storage device through a fourth line. Characterized by including
How to implement a carbon dioxide liquefaction system using LNG.
In clause 7,
The step of liquefying the gaseous carbon dioxide distributed from the distributor into liquid carbon dioxide and transferring it to a storage container through the second line
After pressurizing the gaseous carbon dioxide introduced from the distributor, lowering the temperature of the pressurized gaseous carbon dioxide and transferring it to a storage container through the second line.
How to implement a carbon dioxide liquefaction system using LNG.
According to clause 8,
Characterized in that it further comprises the step of transferring the liquid carbon dioxide of which the temperature has been lowered and the liquid carbon dioxide transferred through the first line to a carbon dioxide storage container through a sixth line.
How to implement a carbon dioxide liquefaction system using LNG.
In clause 7,
Through heat exchange between the gaseous carbon dioxide distributed and introduced from the distributor and the liquid state LNG, the liquid state LNG is vaporized and transferred through the fourth line, and the gaseous carbon dioxide is liquefied to the third line. Characterized by comprising the step of transferring
How to implement a carbon dioxide liquefaction system using LNG.
According to clause 10,
The liquid LNG gas is boosted to the required pressure of the engine, and the liquid LNG compressed in the third compressor is vaporized through the evaporator. When the remaining liquid LNG is introduced, the gas is transferred through the third line. A step of exchanging heat with carbon dioxide and vaporizing the liquid LNG through heat exchange with G/W when the remaining liquid LNG vaporized in the first heat exchanger is introduced.
How to implement a carbon dioxide liquefaction system using LNG.
According to clause 11,
Further comprising the step of lowering the pressure of the liquid carbon dioxide to a low temperature and transferring the liquid carbon dioxide to the storage container through a third line.
How to implement a carbon dioxide liquefaction system using LNG.