KR101938912B1 - A Treatment System of Liquefied Gas - Google Patents

Abstract

The present invention relates to a liquefied gas processing system comprising: a liquefied gas supply line connected from a liquefied gas storage tank to a customer; And an evaporative gas re-liquefier provided on an evaporative gas liquefaction line for re-liquefying the evaporative gas generated in the liquefied gas storage tank, wherein the evaporative gas re-liquefier comprises a cooler for the refrigerant before compression, And the refrigerant after the compression is cooled in the refrigerant heat exchanger by utilizing the cold heat of the gas.
The liquefied gas processing system according to the present invention utilizes the cold heat of the refrigerant before the compression and the cold heat of the liquefied gas flowing through the liquefied gas supply line flowing through the refrigerant circulation line to cool the compressed refrigerant flowing through the refrigerant circulation line of the refrigerant heat exchanger It is possible to effectively cool the compressed refrigerant flowing into the refrigerant expansion device and to improve the liquefaction efficiency of the evaporated gas re-cryogenator, and furthermore, the liquefied gas supplied to the liquefied gas vaporizer can be cooled by the refrigerant before compression By utilizing the heat of the compressed refrigerant and raising the temperature, the load of the liquefied gas vaporizer can be reduced.

Description

Description of the Related Art A Treatment System of Liquefied Gas

The present invention relates to a liquefied gas processing system.

A ship is a means of transporting large quantities of minerals, crude oil, natural gas, or more than a thousand containers. It is made of steel and buoyant to float on the water surface. ≪ / RTI >

Such a ship generates thrust by driving a customer. At this time, the customer uses an engine that moves the piston by gasoline or diesel to rotate the crankshaft by the reciprocating motion of the piston. The shaft connected to the crankshaft is rotated, .

In recent years, however, LNG carriers have been used as fuel for LNG carriers that transport Liquefied Natural Gas (LNG). LNG carriers are used as fuel for LNG carriers, It is also applied to other ships.

Generally, it is known that LNG is a clean fuel and its reserves are more abundant than petroleum, and its usage is rapidly increasing as mining and transfer technology develops. This LNG is generally stored in a liquid state at a temperature of -162 ° C. or less under a pressure of 1 atm. The volume of liquefied methane is about one sixth of the volume of methane in a gaseous state in a standard state, Is 0.42, which is about one half of the specific gravity of crude oil.

However, the temperature and pressure required to drive demand can differ from the state of the LNG stored in the tank. Therefore, in recent years, research and development have been conducted on technologies for controlling the temperature and pressure of LNG stored in a liquid state and supplying it to customers.

(Prior Art 1) Registration Practical Utility Model No. 20-0394721 (published on Aug. 29, 2005)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquefied gas processing system capable of reducing the load of a liquefied gas vaporizer while improving liquefaction efficiency of an evaporation gas re- will be.

A liquefied gas processing system according to an aspect of the present invention includes a liquefied gas supply line connected from a liquefied gas storage tank to a customer site; And an evaporative gas re-liquefier provided on an evaporative gas liquefaction line for re-liquefying the evaporative gas generated in the liquefied gas storage tank, wherein the evaporative gas re-liquefier includes: And the refrigerant after the compression is cooled in the refrigerant heat exchanger by utilizing the cold heat of the gas.

Specifically, the refrigerant may be nitrogen.

Specifically, the evaporation gas re-liquefaction unit may include: a refrigerant circulation line for circulating the refrigerant; A refrigerant inflator provided on the refrigerant circulation line and adapted to expand and expand the refrigerant after being compressed by the refrigerant heat exchanger; An evaporative gas condenser provided on the refrigerant circulation line for cooling the evaporative gas using the refrigerant expanded in the refrigerant inflator; And a refrigerant compressor provided on the refrigerant circulation line for compressing the refrigerant introduced from the evaporative gas condenser before the compression.

Specifically, the refrigerant heat exchanger includes a refrigerant circulation line through which the refrigerant before the compression flows, a refrigerant circulation line through which the refrigerant after the compression flows, and a refrigerant circulation line through which the refrigerant flows, - BOG / refrigerant (before compression) / refrigerant (after compression) heat exchanger in stream structure.

Specifically, the apparatus may further include an evaporative gas compressor provided on the evaporative gas liquefaction line, and the evaporative gas remover may be installed at a rear end of the evaporative gas compressor.

Specifically, the apparatus may further include a liquefied gas vaporizer provided on the liquefied gas supply line and heating the liquefied gas discharged from the liquefied gas storage tank.

Specifically, the customer may be a gas turbine consuming evaporative gas; And a first turbine generator connected to the gas turbine.

Specifically, the customer may further include a steam generator for generating steam using the exhaust gas generated from the gas turbine.

Specifically, the customer may include: a steam turbine connected to the steam generator to consume steam; And a second turbine generator connected to the steam turbine.

Specifically, the customer may further include a steam condenser for condensing the steam discharged from the steam turbine and supplying the condensed steam to the steam generator.

The liquefied gas processing system according to the present invention utilizes the cold heat of the refrigerant before the compression and the cold heat of the liquefied gas flowing through the liquefied gas supply line flowing through the refrigerant circulation line to generate the compressed refrigerant flowing through the refrigerant circulation line of the refrigerant heat exchanger Is cooled in the refrigerant heat exchanger, the refrigerant after being compressed into the refrigerant inflator can be effectively cooled, and the liquefaction efficiency of the evaporation gas re-cure unit can be improved.

Further, the liquefied gas processing system according to the present invention can reduce the load of the liquefied gas vaporizer by raising the temperature of the liquefied gas supplied to the liquefied gas vaporizer by utilizing the heat of the refrigerant before the compression and after the compression.

1 is a conceptual diagram of a liquefied gas processing system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a customer 20, an evaporation gas liquefaction line 30, an evaporative gas compressor (not shown) 40, a vaporized gas remover 50, a liquefied gas supply line 60, a liquefied gas pump 70, a liquefied gas vaporizer 80, and a fruit supply unit 90.

Hereinafter, the liquefied gas may refer to LNG, and LNG may be used not only in the liquid state NG (natural gas) but also in the gas state, the supercooled state, and the NG, such as the supercritical state, The gas may be used to include not only gaseous vaporized gas but also liquefied vaporized gas.

It should be understood that the present invention is not limited to the application to the ship as described in the background art, but may be applied to any equipment that can be installed on a ship, onshore, etc. and consumes LNG to produce power.

The liquefied gas storage tank (10) stores liquefied gas to be supplied to the customer (20). The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, wherein the liquefied gas storage tank 10 may have the form of a pressure tank.

The liquefied gas storage tank 10 includes an outer tank (not shown), an inner tank (not shown), and a heat insulating portion (not shown). The outer tank may be made of steel, and the inner tank may be made of stainless steel and designed to withstand a pressure of 1 bar to 10 bar. The heat insulating portion is provided between the inner tank and the outer tank, and may be formed of a vacuum structure or a heat insulating material so as to prevent external heat energy from being transferred to the inner tank.

The customer 20 may include a gas turbine 21 or an engine and is driven through liquefied gas supplied from the liquefied gas storage tank 10 to generate power. At this time, the customer 20 may include a gas turbine 21, a first turbine generator 22, a steam generator 23, a steam turbine 24, and a second turbine generator 25.

The gas turbine 21 receives and consumes the evaporation gas generated in the liquefied gas storage tank 10 or the evaporation gas forcibly generated by the liquefied gas vaporizer 80. The gas turbine 21 can combust the evaporation gas with the compressed air to rotate the turbine wheel (not shown).

The gas turbine 21 may be connected to the first turbine generator 22. The first turbine generator 22 can generate power as the evaporation gas is consumed by the gas turbine 21. A plurality of gas turbines 21 may be provided according to the amount of power required, and a first turbine generator 22 may be connected to each gas turbine 21. When a plurality of gas turbines 21 are provided, a liquefied gas supply line 60 may be branched upstream of the gas turbine 21 to be connected to each gas turbine 21. At this time, the branched liquefied gas supply line 60 can also be connected to the upstream side of the steam generator 23.

The first turbine generator 22 is connected to the gas turbine 21 to produce power. At this time, the first turbine generator 22 is electrically connected to the output motor 27 (means (not shown) for current or voltage conversion may be provided at the front end of the output motor 27) As the motor 27 is connected to the propeller shaft via the reduction gear portion 28, the propeller 29 or the like can be rotated to advance or reverse the ship. Of course, the power generated by the first turbine generator 22 can be transmitted to the means requiring power consumption, in addition to the forward and backward movement of the ship.

The steam generator 23 generates steam by using the exhaust gas generated from the gas turbine 21. A duct burner (not shown) may be provided on the liquefied gas supply line 60 branched upstream of the gas turbine 21 and upstream of the steam generator 23, and the duct burner is connected to the liquefied gas supply line 60 The steam generator 23 generates steam by burning the vaporized liquefied gas supplied from the steam generator 23.

The steam generator 23 generates steam by using exhaust heat emitted from the gas turbine 21 and supplies the generated steam to the steam turbine 24. The steam turbine 21 is a steam turbine.

The steam turbine 24 is connected to the steam generator 23 to consume steam. The steam turbine 24 can rotate the turbine wheel (not shown) by the pressure of the steam and the second turbine generator 25 can be connected to the steam turbine 24 to produce power.

The second turbine generator 25 is connected to the steam turbine 24 and produces power similarly to the first turbine generator 22. [ The second turbine generator 25 may operate as a subsidiary generator of the first turbine generator 22 because the exhaust gas must be generated as the gas turbine 21 to which the first turbine generator 22 is connected is driven, This is because the steam turbine 24 to which the generator 25 is connected can be driven.

The customer 20 may further include a steam condenser 26 for condensing the steam discharged from the steam turbine 24 and supplying the condensed steam to the steam generator 23. The steam is discharged from the steam turbine 24 after the steam turbine 24 is turned under a strong pressure. The steam condenser 26 cools the steam discharged from the steam turbine 24 to generate condensed water, To the generator (23). In this case, the condensed water flowing into the steam generator 23 may be converted into steam by the exhaust of the gas turbine 21 and may flow into the steam turbine 24 again.

The evaporation gas liquefaction line (30) can be configured to re-liquefy the evaporated gas generated in the liquefied gas storage tank (10) and to be returned to the liquefied gas storage tank (10). An evaporative gas compressor 40 and an evaporative gas re-culling unit 50 may be provided on the evaporative gas liquefaction line 30.

In addition, an evaporation gas supply valve (not shown) is provided in the evaporation gas liquefaction line 30 so that the supply amount of the evaporation gas introduced into the evaporation gas compressor 40 can be adjusted according to the opening degree of the evaporation gas supply valve have.

An evaporation gas compressor (40) is provided on the evaporation gas liquefaction line (30) and compresses the evaporation gas discharged from the liquefied gas storage tank (10). A plurality of evaporation gas compressors (40) are provided in series to pressurize the evaporation gas at multiple stages. For example, three evaporation gases may be provided so that the evaporation gas is pressurized in three stages.

The plurality of evaporation gas compressors 40 are provided in parallel so that when one of the evaporation gas compressors 40 is broken or can not operate, the other evaporation gas compressor 40 is used to supply the evaporation gas Can be smoothly compressed.

The evaporative gas compressor 40 described above is disposed at the front end of the evaporative gas re-culling unit 50 to be described later and pressurizes the evaporative gas, thereby enhancing the liquefaction efficiency of the evaporative gas.

The evaporation gas re-curing unit (50) is provided on the evaporation gas liquefaction line (30) to re-liquefy the evaporation gas. The evaporated gas recovered to the liquefied gas storage tank 10 along the evaporative gas liquefaction line 30 is in the form of gas and can be pressurized to increase the pressure of the liquefied gas storage tank 10 when it is directly introduced into the liquefied gas storage tank 10 Which may increase the risk of breakage of the liquefied gas storage tank 10. In addition, if the evaporated gas flows into the liquefied gas storage tank 10 in a gaseous state, the introduced evaporated gas is discharged again from the liquefied gas storage tank 10 along the evaporated gas liquefaction line 30, It may not be achieved. Accordingly, the evaporated gas remanent unit 50 can liquefy and supply the evaporated gas to the liquefied gas storage tank 10 so that the liquefied gas storage tank 10 can be protected and the flow rate of the evaporated gas can be smoothly controlled in the system.

The evaporative gas remanent unit 50 may include a refrigerant compressor 52, a refrigerant inflator 53, an evaporative gas condenser 54, and a refrigerant heat exchanger 55. The respective constituents of the evaporative gas remanufacturing unit 50 may be connected by the refrigerant circulation line 51 and the refrigerant may be nitrogen and the refrigerant is circulated through the refrigerant compressor 52, the refrigerant heat exchanger 55, The refrigerant inflator 53, and the evaporative gas condenser 54, as shown in Fig.

The refrigerant compressor (52) is provided in the refrigerant circulation line (51) and compresses the refrigerant. A plurality of refrigerant compressors (52) are provided in series, similar to the evaporative gas compressor (40), so that the refrigerant can be multi-stage compressed. The refrigerant compressor 52 is connected to a refrigerant inflator 53, which will be described later, through a single shaft, and the refrigerant compressor 52 and the refrigerant inflator 53 constitute a refrigerant compander. The refrigerant compressor 52 can compress the heated refrigerant while exchanging heat with the evaporation gas in the evaporative gas condenser 54 and the refrigerant compressed by the refrigerant compressor 52 can be introduced into the refrigerant heat exchanger 55.

The refrigerant inflator (53) is provided in the refrigerant circulation line (51) and inflates the compressed refrigerant. The refrigerant inflator 53 is capable of expanding the refrigerant discharged from the refrigerant heat exchanger 55 and the rotational force generated by expansion of the refrigerant in the refrigerant inflator 53 is transmitted to the refrigerant compressor 53 connected to the refrigerant inflator 53 via a single shaft, (Not shown).

As the refrigerant inflator 53 expands the refrigerant, the refrigerant can be cooled down to a certain temperature while being reduced in pressure, and the cooled refrigerant can flow into the evaporation gas condenser 54 to liquefy the evaporation gas.

The evaporation gas condenser 54 is provided on the refrigerant circulation line 51 and the evaporation gas liquefaction line 30 and uses the refrigerant to cool the evaporation gas. The refrigerant may cool the evaporation gas to below -162 ° C at 1 bar to allow the evaporation gas to change to liquefied gas. Of course, the temperature at which the evaporated gas is cooled in the evaporative gas condenser 54 may vary depending on the pressure of the evaporated gas. For example, when the evaporated gas is at 3 bar, the refrigerant is heated to a boiling point of about 3 bar It can be cooled and liquefied.

That is, in the evaporative gas condenser 54, the refrigerant can cool the evaporated gas to a temperature lower than the boiling point corresponding to the current pressure of the evaporated gas, so that the evaporated gas is liquefied. At this time, the refrigerant can be heated while providing heat to the evaporation gas and heat to the evaporation gas.

The refrigerant heat exchanger 55 is provided on the refrigerant circulation line 51 at the rear stage of the evaporative gas condenser 54 and the refrigerant circulation line 51 at the rear stage of the refrigerant compressor 52 to supply the refrigerant compressed in the refrigerant compressor 52 (The refrigerant after the compression) and the refrigerant heated by the evaporative gas condenser 54 (the refrigerant before the compression) are exchanged with each other so that the refrigerant is cooled and transferred to the refrigerant inflator 53. The refrigerant heated by the evaporation gas condenser 54 Can be heated and delivered to the compressor.

The refrigerant expanded in the refrigerant inflator 53 can be first heated in the evaporative gas condenser 54 and heated in the refrigerant heat exchanger 55 in the second order and then introduced into the refrigerant compressor 52. In the refrigerant compressor 52, The discharged refrigerant (refrigerant after compression) can be cooled by the refrigerant heat exchanger 55 and then introduced into the refrigerant inflator 53. [

The refrigerant heat exchanger 55 can reduce the temperature of the refrigerant flowing into the refrigerant inflator 53 to reduce the volume of the refrigerant and reduce the load of the refrigerant inflator 53. This can reduce the load of the refrigerant inflator 53, Is determined proportionally to the volume of the refrigerant. That is, in order to reduce the load of the refrigerant inflator 53, it is necessary to sufficiently supply the cold heat in the refrigerant heat exchanger 55 before the refrigerant is introduced. To this end, in this embodiment, the refrigerant heat exchanger 55 includes a refrigerant circulation line 51 at the front end of the refrigerant compressor 52 in which the refrigerant before compression flows, and a refrigerant circulation line 51 at the rear end of the refrigerant compressor 52 in which the refrigerant after compression flows The refrigerant heat exchanger 55 may be provided on the refrigerant circulation line 51 as well as on the liquefied gas supply line 60 so as to utilize the cold heat of the liquefied gas, Refrigerant (before compression) / refrigerant (after compression) heat exchanger.

 In the refrigerant heat exchanger 55 as a three-stream LNG / refrigerant (before compression) / refrigerant (after compression) heat exchanger, the refrigerant heat exchanger 55 are preferably provided on the liquefied gas supply line 60 at the upstream side of the liquefied gas vaporizer 80 to be described later.

Accordingly, in the present embodiment, the cold heat of the refrigerant before the refrigerant flowing through the refrigerant circulation line 51 of the refrigerant heat exchanger 55 and the cold heat of the liquefied gas flowing through the liquefied gas supply line 60 are utilized to cool the refrigerant in the refrigerant heat exchanger The refrigerant after the compression which flows into the refrigerant circulation line 51 of the refrigerant circulation line 51 is cooled and thereby the refrigerant after the compression which flows into the refrigerant inflator 53 can be effectively cooled and the refrigerant expanded in the refrigerant inflator 53 is cooled at a low temperature Accordingly, the evaporation gas condenser 54 can utilize this, and the liquefaction efficiency of the evaporation gas re-culling unit 50 can be improved.

The liquefied gas supply line (60) is connected from the liquefied gas storage tank (10) to the customer (20).

A liquefied gas pump 70 provided in the liquefied gas storage tank 10 in the liquefied gas supply line 60 may be provided. The liquefied gas pump 70 may include a boosting pump 71 and a high-pressure pump 72. For example, the booster pump 71 may be a submergible pump and may be located inside the liquefied gas storage tank 10 to discharge the liquefied gas stored in the liquefied gas storage tank 10 to the outside. The high pressure pump 72 is provided downstream of the booster pump 71 and pressurizes the liquefied gas discharged from the booster pump 71. The high-pressure pump 72 can be pressurized to the required pressure of the liquefied gas required by the customer 20, and can be multi-stage.

The liquefied gas vaporizer 80 is provided on the liquefied gas supply line 60 so that the liquefied gas discharged and pressurized by the liquefied gas pump 70 can be supplied to the customer 20 in a vaporized gas state. The liquefied gas supply line (60) may be provided with a liquefied gas supply valve (61) for regulating the supply amount of liquefied gas. The liquefied gas supply valve 61 is provided at the front end of the gas turbine 21 and when a plurality of gas turbines 21 are provided, a liquefied gas supply valve 61 is provided at the front end of each gas turbine 21 .

In the above, the liquefied gas supply line 60 is not configured to flow directly from the liquefied gas storage tank 10 via the liquefied gas vaporizer 80, but is configured to pass through the refrigerant heat exchanger 55 as described above .

A liquefied gas vaporizer (80) is provided on the liquefied gas supply line (60) and heats the liquefied gas discharged from the liquefied gas storage tank (10). The liquefied gas vaporizer 80 can heat the liquefied gas and heat the liquefied gas by heat exchange with the liquefied gas, and the heated liquefied gas can be changed to an evaporated gas as it has a high temperature. As the fruit, glycol water or the like can be used.

The fruit can be circulated through the liquefied gas vaporizer 80. Specifically, the liquor is passed through the liquefied gas vaporizer 80 to the liquefier gas storage tank 92, the lyse pump 93, And then flows into the vaporizer 80 again.

Since the liquefied gas vaporizer 80 serves to vaporize the liquefied gas discharged from the liquefied gas storage tank 10 by utilizing the heat of the heat, it is necessary to sufficiently supply heat to the liquefied gas. The liquefied gas supply line 60 at the upstream end of the liquefied gas vaporizer 80 is connected to the refrigerant heat exchanger 55 and is supplied to the liquefied gas vaporizer 80 So that the temperature of the pre-liquefied gas can be increased by causing the liquid gas to be heat-exchanged with the refrigerant introduced into the refrigerant compressor (52) before the compression and the refrigerant discharged from the refrigerant compressor (52).

Thus, in this embodiment, the liquefied gas discharged from the liquefied gas storage tank 10 is heat-exchanged with the refrigerant before and after the compression from the refrigerant compressor 52 so that the liquefied gas supplied to the liquefied gas vaporizer 80 is stored in the liquefied gas storage The temperature is raised as compared with that supplied directly from the tank 10, and the load of the liquefied gas vaporizer 80 can be reduced.

The heat supply portion 90 supplies heat to the liquefied gas vaporizer 80. The fruit supply part 90 may include a fruit circulation line 91, a fruit storage tank 92, a fruit pump 93, and a fruit heater 94.

The fruit circulation line (91) circulates the fruit to the liquefied gas vaporizer (80). Here, the fruit is cooled in the liquefied gas vaporizer 80 by the liquefied gas discharged from the liquefied gas pump 70.

The fruit circulation line 91 has a closed loop structure and a fruit storage tank 92 capable of receiving the fruit from the outside or discharging the fruit to the outside is connected with the liquefied gas vaporizer 91 on the fruit circulation line 91, (Not shown). The fruit storage tank 92 may have a general tank structure.

The fruit pump 93 is provided on the fruit circulation line 91 and circulates the fruit. The heat pump 93 may be a centrifugal pump, and a plurality of heat pumps may be provided in parallel or in series, as in the case of the evaporative gas compressor 40. The fruit discharged from the fruit pump 93 may flow into the fruit heater 94.

The fruit heater 94 is provided on the fruit circulation line 91 and heats the fruit. The fruit heater 94 can heat the fruit using the waste heat in the ship or can receive the steam from the steam generator 23 to heat the fruit. For this purpose, a steam supply line (not shown) may be separately provided from the steam generator 23 to the heating heater 94.

As described above, in this embodiment, the refrigerant circulated through the refrigerant circulation line (51) is transferred to the refrigerant circulation line (51) of the refrigerant heat exchanger (55) by utilizing the cold heat of the refrigerant before compression and the cold heat of the liquefied gas flowing through the liquefied gas supply line The refrigerant after the compression flowing into the refrigerant inflator 53 can be cooled effectively and the liquefaction efficiency of the evaporation gas re-cryogenator 50 can be improved by cooling the compressed refrigerant flowing through the refrigerant heat exchanger 51 .

The present embodiment can reduce the load of the liquefied gas vaporizer 80 by raising the temperature of the liquefied gas supplied to the liquefied gas vaporizer 80 by utilizing the heat of the refrigerant before compression and the heat of the compressed refrigerant.

1: liquefied gas processing system 10: liquefied gas storage tank
20: customer demand 21: gas turbine
22: first turbine generator 23: steam generator
24: Steam turbine 25: Second turbine generator
26: Steam condenser 27: Output motor
28: reduction gear portion 29: propeller
30: Evaporative gas liquefaction line 40: Evaporative gas compressor
50: Evaporative gas remover 51: Refrigerant circulation line
52: Refrigerant compressor 53: Refrigerant expander
54: Evaporative gas condenser 55: Refrigerant heat exchanger
60: Liquefied gas supply line 61: Liquefied gas supply valve
70: liquefied gas pump 71: booster pump
72: high pressure pump 80: liquefied gas vaporizer
90: fruit supply part 91: fruit circulation line
92: fruit storage tank 93: fruit pump
94: Fruit Heater

Claims (10)

A liquefied gas supply line connected from the liquefied gas storage tank to the customer;
A pump and a liquefied gas vaporizer provided on the liquefied gas supply line for pressurizing or heating the liquefied gas discharged from the liquefied gas storage tank to a desired pressure and temperature of the customer;
An evaporative gas liquefaction line for re-liquefying the evaporated gas generated in the liquefied gas storage tank and returning it to the storage tank; And
And an evaporation gas re-curing unit provided on the evaporation gas liquefaction line,
Wherein the customer includes a gas turbine and a steam generator which are supplied with fuel from the pump and the liquefied gas vaporizer,
The steam generator receives heat from the gas turbine and receives heat from a duct burner that receives fuel from the pump and the liquefied gas vaporizer,
The evaporation gas re-liquefier may comprise:
Refrigerant circulation line;
A refrigerant compressor provided in the refrigerant circulation line for compressing the refrigerant;
A refrigerant inflator for expanding the refrigerant compressed in the refrigerant compressor;
An evaporative gas condenser for exchanging the refrigerant cooled in the refrigerant inflator with the evaporated gas generated in the liquefied gas storage tank; And
The refrigerant compressor is provided on the liquefied gas supply line with a refrigerant compressed in the refrigerant compressor and heat exchanged with the refrigerant delivered from the evaporative gas condenser to the refrigerant compressor and the liquefied gas supplied to the liquefied gas vaporizer, Wherein the refrigerant heat exchanger is a refrigerant heat exchanger. The refrigerating machine according to claim 1,
Wherein the nitrogen gas is nitrogen. delete The refrigerant heat exchanger according to claim 1,
A refrigerant circulation line through which the refrigerant before the compression flows, a refrigerant circulation line through which the refrigerant after the compression flows, and a BOG / refrigerant of a three-stream structure provided on the liquefied gas supply line through which the liquefied gas flows (Before compression) / refrigerant (after compression) heat exchanger. The method according to claim 1,
Further comprising an evaporative gas compressor provided on the evaporative gas liquefaction line,
The evaporation gas re-liquefier may comprise:
And is installed at the rear end of the evaporative gas compressor. delete The system according to claim 1,
Further comprising a first turbine generator coupled to the gas turbine. delete The system according to claim 1,
A steam turbine connected to the steam generator to consume steam; And
Further comprising a second turbine generator coupled to the steam turbine. 10. The system according to claim 9,
Further comprising: a steam condenser for condensing the steam discharged from the steam turbine and supplying the condensed steam to the steam generator.

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