KR20150039437A - A Treatment System and Method of Liquefied Gas - Google Patents

A Treatment System and Method of Liquefied Gas Download PDF

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Publication number
KR20150039437A
KR20150039437A KR20130118012A KR20130118012A KR20150039437A KR 20150039437 A KR20150039437 A KR 20150039437A KR 20130118012 A KR20130118012 A KR 20130118012A KR 20130118012 A KR20130118012 A KR 20130118012A KR 20150039437 A KR20150039437 A KR 20150039437A
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South Korea
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lpg
liquefied gas
gas
lng
storage tank
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KR20130118012A
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Korean (ko)
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백은성
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현대중공업 주식회사
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Priority to KR20130118012A priority Critical patent/KR20150039437A/en
Publication of KR20150039437A publication Critical patent/KR20150039437A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A liquefied gas processing system according to an embodiment of the present invention includes a first liquefied gas supply line connected from a first liquefied gas storage tank to a customer site; A pump installed on the first liquefied gas supply line; A heater provided on the first liquefied gas supply line between the demander and the pump; A second liquefied gas circulation line for liquefying and circulating the generated gas generated in the second liquefied gas storage tank to the second liquefied gas storage tank; A first liquefied gas supply line between the customer and the pump, and a liquefied gas heat exchanger provided on the second liquefied gas circulation line; A compressor installed in the second liquefied gas circulation line upstream of the liquefied gas heat exchanger; And a decompressor installed in the second liquefied gas circulation line downstream of the liquefied gas heat exchanger, wherein the first liquefied gas has a boiling point relatively lower than the second liquefied gas, and is generated from the second liquefied gas And the evaporated gas is liquefied by the cold heat of the first liquefied gas in the liquefied gas heat exchanger.
The liquefied gas processing system according to the present invention is a system for exchanging LPG vapor generated in an LPG storage tank with LNG liquefied gas supplied from a LNG storage tank to a consumer at a relatively low temperature, It is possible to prevent the LPG evaporation gas from being discarded and to improve the degree of recycling of the LPG evaporation gas and to improve the recycling efficiency of the LPG evaporation gas, The amount of heat required for vaporizing the LNG liquefied gas for use as the fuel of the engine can be reduced to the LPG evaporation gas So that the energy efficiency of the LNG fuel supplied to the customer can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a liquefied gas processing system.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas that is obtained by refining natural gas collected from a gas field. It is a colorless transparent liquid with almost no pollutants and high calorific value. On the other hand, liquefied petroleum gas is a liquid fuel made from compressed propane (C 3 H 8 ) and butane (C 4 H 10 ), which are derived from petroleum in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in an LNG storage tank installed on the ground or stored in an LNG storage tank provided in a ship which is a transportation means navigating the ocean. Liquefied natural gas is reduced to 1/600 volume by liquefaction, Liquefied petroleum gas has the advantages of liquefaction, which reduces the propane to 1/260 and the butane to the volume of 1/230, which is high storage efficiency.

These liquefied gases are supplied to various customers and used. Recently, LNG carrier that uses LNG as fuel for LNG carriers that transport liquefied natural gas has been developed. The method used is also applied to other vessels such as LPG carriers other than LNG carriers.

However, the temperature and pressure of the liquefied gas required by a customer such as an engine may be different from the state of the liquefied gas stored in the LNG storage tank. Therefore, recently, research and development have been conducted on technologies for controlling the temperature and pressure of the liquefied gas stored in a liquid state to supply it to a customer.

In addition, the LPG storage tank is installed on an LPG carrier or on the ground. Liquid LPG stored in the LPG storage tank is vaporized by heat penetration from the outside to generate boil-off gas (BOG) In order to lower the pressure of the tank to eliminate the risk of breakage of the tank, the LPG evaporation gas was simply discharged to the outside, but the LPG evaporation gas could not be utilized at all, resulting in energy waste. In order to solve this problem, there is an increasing need to develop a method of recycling the LPG vaporized gas, such as recovering the LPG vapor generated in the LPG storage tank to the LPG storage tank through the liquefaction device.

On the other hand, in order to re-liquefy the LPG evaporated gas, a system for exchanging the LPG evaporated gas with the LNG evaporated gas is disclosed in Korean Patent No. 10-1078645. However, since the LNG evaporated gas discharged from the LNG storage tank is configured to return to the LNG storage tank through the LNG re-liquefier after cooling the LPG evaporated gas, the temperature of the LPG evaporated gas and the heat exchanged LNG evaporated gas can be increased In order to liquefy the LNG evaporation gas, which has only a high temperature, there is a problem that the LNG re-liquefying apparatus requires a lot of cooling heat, thereby increasing energy consumption.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide an LPG storage tank, in which LPG evaporation gas generated from an LPG storage tank is supplied from an LNG storage tank to a customer, And to provide a liquefied gas processing system that can be re-liquefied without a separate liquefier.

It is another object of the present invention to provide a method and apparatus for recovering LNG liquefied gas from an LNG storage tank to a customer using a relatively high temperature LPG vapor generated in an LPG storage tank to obtain the amount of heat required for vaporizing the LNG liquefied gas from the LPG vapor And to provide a liquefied gas processing system that is capable of providing a liquefied gas.

A liquefied gas processing system according to an aspect of the present invention includes a first liquefied gas supply line connected from a first liquefied gas storage tank to a customer site; A pump installed on the first liquefied gas supply line; A heater provided on the first liquefied gas supply line between the demander and the pump; A second liquefied gas circulation line for liquefying and circulating the generated gas generated in the second liquefied gas storage tank to the second liquefied gas storage tank; A first liquefied gas supply line between the customer and the pump, and a liquefied gas heat exchanger provided on the second liquefied gas circulation line; A compressor installed in the second liquefied gas circulation line upstream of the liquefied gas heat exchanger; And a decompressor installed in the second liquefied gas circulation line downstream of the liquefied gas heat exchanger, wherein the first liquefied gas has a boiling point relatively lower than the second liquefied gas, and is generated from the second liquefied gas And the evaporated gas is liquefied by the cold heat of the first liquefied gas in the liquefied gas heat exchanger.

Specifically, the first liquefied gas is LNG, the second liquefied gas is LPG, the first liquefied gas supply line is an LNG liquefied gas supply line, and the second liquefied gas circulation line is LPG evaporation Gas recirculation line, the liquefied gas heat exchanger is an LNG / LPG heat exchanger, and the compressor may be an LPG evaporative gas compressor.

Specifically, the LPG evaporative gas compressor is installed in the LPG evaporative gas circulation line on the side from which the LPG evaporative gas is discharged from the LPG storage tank, and compresses the LPG evaporative gas and supplies it to the LNG / LPG heat exchanger can do.

Specifically, the LPG evaporation gas passing through the LPG evaporation gas compressor is higher in pressure than the LPG evaporation gas discharged from the LPG storage tank and higher in temperature than the LPG evaporation gas discharged from the LPG storage tank .

Specifically, the LNG / LPG heat exchanger exchanges heat between the LNG liquefied gas discharged from the pump through the LNG liquefied gas supply line and the LPG evaporated gas discharged from the LPG evaporative gas compressor through the LPG evaporative gas circulation line, .

In more detail, the LPG evaporation gas may include re-circulation of the LNG / LPG heat exchanger, which is lost heat and is recovered to the LPG storage tank.

Specifically, the LPG evaporating gas passed through the LNG / LPG heat exchanger is supplied to the LPG evaporating gas compressor through the LPG evaporating gas compressor, the pressure of which is equal to or lower than the pressure of the LPG evaporating gas passed through the LPG evaporating gas compressor, ≪ / RTI >

Specifically, the LNG liquefied gas passed through the LNG / LPG heat exchanger includes a pressure equal to or lower than the pressure of the LPG liquefied gas passed through the pump and a temperature higher than the temperature of the LPG liquefied gas passed through the pump .

Specifically, the pressure reducer is installed in the LPG evaporative gas circulation line on the side where the LPG evaporated gas discharged from the LPG storage tank is recovered to the LPG storage tank through the LPG evaporative gas compressor and the LNG / LPG heat exchanger, And reducing the LPG evaporating gas to be recovered to the LPG storage tank.

Specifically, the LPG evaporation gas passing through the pressure reducing unit is equal to the pressure of the LPG evaporating gas discharged from the LPG storage tank, and the temperature is equal to or higher than the temperature of the LPG evaporating gas passing through the LNG / LPG heat exchanger Low.

Specifically, the pump may include a high-pressure pump and a boosting pump for pressurizing the LNG discharged from the LNG storage tank.

Specifically, a heater may be provided on the LNG liquefied gas supply line between the customer and the pump.

The liquefied gas processing system according to the present invention is configured to heat exchange the LPG vapor generated in the LPG storage tank with the relatively low temperature LNG liquefied gas supplied from the LNG storage tank to the customer to prevent the LPG evaporated gas from being discarded Not only the recyclability of the LPG evaporation gas can be improved, but also the LPG evaporation gas can be re-liquefied without a separate liquefier, which can reduce the installation of the liquefier and the facility flow.

Further, the liquefied gas processing system according to the present invention is configured such that the LNG liquefied gas supplied from the LNG storage tank to the customer is heat-exchanged with the relatively high-temperature LPG evaporated gas generated in the LPG storage tank, A necessary amount of heat can be obtained from the LPG vaporized gas, and the energy efficiency of the LNG fuel supplied to the customer can be improved.

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

1, a liquefied gas processing system 2 according to an embodiment of the present invention includes an LNG storage tank 10, a customer 20, a pump 30, an LPG storage tank 110, an LPG An LNG / LPG heat exchanger 130, a pressure reducer 140, and a heater 150. The LNG / LPG heat exchanger 130, the LNG / LPG heat exchanger 130, The LNG storage tank 10 may be provided with an LNG evaporated gas discharge line 16 for treating the LNG evaporated gas naturally produced in the LNG storage tank 10 by external heat penetration.

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to the evaporative gas.

Also, in the present invention, the LNG may be the first liquefied gas and the LPG may be the second liquefied gas, wherein the boiling point of the first liquefied gas may be relatively lower than that of the second liquefied gas. Of course, the present invention does not limit the first and second liquefied gases to LNG and LPG, respectively, and the first and second liquefied gases may refer to all liquefied gases having different boiling points as well as LNG and LPG. Hereinafter, it is assumed that the first liquefied gas is LNG and the second liquefied gas is LPG for convenience.

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

The customer 20 receives the LNG liquefied gas from the LNG storage tank 10. The customer 20 may include a high-pressure liquefied gas consumer and a low-pressure liquefied gas consumer, and may be an engine driven through the LNG liquefied gas to generate power. For example, the high-pressure liquefied gas consumer may be a MEGI engine The low-pressure liquefied gas consumer may be a dual fuel engine (DFDE), a gas combustion unit (GCU), a boiler, or the like, which is a device for incinerating evaporated gas.

When the customer 20 is an engine, as the piston (not shown) inside the cylinder (not shown) reciprocates due to the combustion of the LNG liquefied gas, the crankshaft (not shown) connected to the piston rotates And a shaft (not shown) connected to the crankshaft can be rotated. Therefore, as the propeller (not shown) connected to the shaft finally rotates when the engine is driven, the hull is moved forward or backward.

Of course, in the present embodiment, the engine 20, which is the customer 20, may be an engine for driving the propeller, but may be an engine for generating power or an engine for generating other power. That is, the present embodiment does not specifically limit the type of engine. However, the engine may be an internal combustion engine that generates driving force by combustion of the LNG liquefied gas.

An LNG liquefied gas supply line 21 for delivering LNG liquefied gas may be installed between the LNG storage tank 10 and the customer 20 and a pump 30, an LNG / LPG A heat exchanger 130 and a heater 150 may be provided to supply the LNG liquefied gas to the customer 20.

At this time, a liquefied gas supply valve (not shown) is provided in the LNG liquefied gas supply line 21, and the supply amount of the LNG liquefied gas can be adjusted in accordance with the opening degree of the liquefied gas supply valve.

The pump 30 is provided on the LNG liquefied gas supply line 21 and pressurizes the LNG liquefied gas discharged from the LNG storage tank 10 to a pressure required by the customer 20. Of course, the pressure required by the customer 20 may vary depending on the type of the customer 20, such as a gas fuel engine (MEGI engine), a dual fuel engine (DFDE), a GCU, a boiler, The pump 30 may include a boosting pump 31 and a high pressure pump 32.

Hereinafter, the case where the customer 20 using the LNG liquefied gas as the fuel is the MEGI engine will be described as an example. The temperature and the pressure referred to herein as numerical values are only intended to facilitate understanding of the present invention. 2) may be varied depending on various factors such as the type of components used and environmental factors.

The boosting pump 31 may be provided on the LNG liquefied gas supply line 21 between the LNG storage tank 10 and the high pressure pump 32 or in the LNG storage tank 10, So that cavitation of the high-pressure pump 32 is prevented. The boosting pump 31 can pressurize the LNG liquefied gas from the LNG storage tank 10 to several to several tens of bar. The LNG liquefied gas passed through the boosting pump 31 is, for example, The LNG liquefied gas stored in the LNG storage tank 10 may have a boiling point of -162 DEG C under 1 atm, for example, -100 DEG C to -160 DEG C Lt; / RTI >

The LNG liquefied gas stored in the LNG storage tank 10 is in a liquid state. At this time, the boosting pump 31 can pressurize the LNG liquefied gas discharged from the LNG storage tank 10 to slightly increase the pressure and the temperature as described above. The LNG liquefied gas pressurized by the boosting pump 31 is still in the liquid Lt; / RTI >

The high pressure pump 32 pressurizes the LNG liquefied gas discharged from the boosting pump 31 to a high pressure so that the LNG liquefied gas is supplied to the customer 20. The LNG liquefied gas is discharged from the LNG storage tank 10 at a pressure within about 10 bar and is then primarily pressurized by the boosting pump 31. The high pressure pump 32 is in a state of being pressurized by the boosting pump 31 The LNG liquefied gas is secondarily pressurized and supplied to the customer 20 through the LNG / LPG heat exchanger 130 and the heater 150.

The high pressure pump 32 can pressurize the LNG liquefied gas to a pressure required by the customer 20, for example, 200 bar to 400 bar, so that the customer 20 can produce the power or the like through the LNG liquefied gas, At this time, the temperature of the LNG liquefied gas passed through the high-pressure pump 32 may be, for example, -80 ° C to -160 ° C.

The LPG storage tank 110 may be installed on an LPG carrier or onshore, and stores the LPG liquefied gas in a liquid state. The liquid LPG liquefied gas stored in the LPG storage tank 110 is vaporized by heat penetration from the outside to generate an evaporative gas. The LPG evaporative gas discharged from the LPG storage tank 110 is stored in the LPG storage tank 110 Considering that the LPG liquefied gas has a boiling point of -42 占 폚 under 1 atm, the temperature may be, for example, -38 占 폚 to -41 占 폚, and the pressure may be, for example, 1 bar to 2 bar.

The LPG storage tank 110 is provided with an LPG evaporation gas circulation line 115 so that the LPG evaporation gas can be exchanged with the relatively low temperature LNG liquefied gas supplied from the LNG storage tank 10 to the customer 20 .

The LPG evaporation gas circulation line 115 may be connected at one end to a portion of the LPG storage tank 110 and at the other end to the other portion of the LPG storage tank 110, An LPG evaporative gas compressor 120 to be described later may be installed in the evaporative gas circulation line 115 and a decompressor 140 to be described later may be installed in the LPG evaporative gas circulation line 115 on the side where the LPG evaporative gas is recovered And an LNG / LPG heat exchanger 130 to be described later may be provided in the LPG evaporative gas circulation line 115 between the LPG evaporative gas compressor 120 and the decompressor 140.

The LPG evaporation gas compressor 120 may be installed in the LPG evaporation gas circulation line 115 on the side from which the LPG evaporation gas is discharged from the LPG storage tank 110 and may be installed in the LPG evaporation gas circulation line 115, LPG heat exchanger 130, which will be described later, with reference to the flow direction of the LNG / LPG heat exchanger 130 as a reference. The LPG evaporated gas discharged from the LPG storage tank 110 may be in a gaseous state.

The LPG evaporating gas compressor 120 compresses the LPG evaporating gas discharged from the LPG storage tank 110 so that heat exchange efficiency can be increased in the LNG / LPG heat exchanger 130 to be described later, and the LNG / LPG heat exchanger The LPG evaporation gas may be supplied to the evaporator 130. At this time, the LPG evaporation gas passing through the LPG evaporative gas compressor 120 may have a pressure higher than the pressure of the LPG evaporative gas discharged from the LPG storage tank 110, for example, 3 bar to 5 bar, 110 < / RTI >

The LNG / LPG heat exchanger 130 is connected to the LPG evaporation gas circulation line 115 between the LPG evaporation gas compressor 120 and the decompressor 140 to be described later and the LNG liquefaction gas circulation line 115 between the pump 30 and the consumer 20. [ And may be provided on the gas supply line 21. Here, the LNG / LPG heat exchanger 130 is disposed downstream of the LPG evaporative gas compressor 120, downstream of the decompressor 140 (to be described later), on the basis of the flow direction of the LPG evaporative gas in the LPG evaporative gas circulation line 115 Can be located upstream.

In the LNG / LPG heat exchanger 130, the LNG liquefied gas discharged from the pump 30 through the LNG liquefied gas supply line 21 and the LNG liquefied gas discharged from the LPG evaporative gas compressor The LNG liquefied gas supplied to the heater 150, which will be described later, is heat-exchanged in the LNG / LPG heat exchanger 130 by the heat of the LPG evaporating gas, LPG evaporating gas recovered to the LPG storage tank 110 is supplied to the LNG / LPG heat exchanger 130. The LNG / LPG heat exchanger 130, The liquefied gas can be re-cooled by losing heat due to the cooling and heating of the LNG liquefied gas. In this case, the LPG evaporating gas passing through the LNG / LPG heat exchanger 130 may have a pressure equal to or slightly lower than the pressure of the LPG evaporating gas passing through the LPG evaporating gas compressor 120, Lt; RTI ID = 0.0 > -75 C < / RTI > The LNG liquefied gas passed through the LNG / LPG heat exchanger 130 may have a pressure equal to or slightly lower than the pressure of the LPG liquefied gas passing through the pump 30, Lt; 0 > C to -45 < 0 > C.

The LPG storage tank 110 is connected to the LPG storage tank 110 through the LPG evaporation gas compressor 120 and the LNG / LPG heat exchanger 130. The LPG storage tank 110 is connected to the LPG storage tank 110, LPG heat exchanger 130 when the flow direction of the LPG evaporation gas is taken as a reference in the LPG evaporation gas circulation line 115. The LNG / LPG heat exchanger 130 may be installed in the evaporation gas circulation line 115, The LPG evaporated gas recovered to the LPG storage tank 110 may be in a liquid state because it is re-liquefied through the LNG / LPG heat exchanger 130 to be described later.

The pressure reducer 140 decompresses the pressure of the LPG evaporating gas, which is equal to or similar to the internal pressure of the LPG storage tank 110, through the LPG evaporative gas compressor 120, and supplies the reduced pressure to the LNG / LPG heat exchanger 130 It is possible to recover the liquefied LPG evaporating gas without increasing the internal pressure of the LPG storage tank 110. The LPG evaporation gas passing through the pressure reducer 140 may be the same or similar to the pressure of the LPG evaporating gas discharged from the LPG storage tank 110, for example, 1 bar to 2 bar, and the temperature may be lower than the LNG / LPG heat exchanger May be equal to or slightly lower than the temperature of the LPG evaporating gas passed through the evaporator 130. Here, the temperature of the LPG evaporated gas recovered to the LPG storage tank 110 is equal to or slightly lower than the temperature of the LPG evaporated gas passed through the LNG / LPG heat exchanger 130, for example, -75 ° C to -135 ° C, The temperature of the LPG liquefied gas in the LPG storage tank 110 can be kept at a lower temperature when the boiling point of the LPG liquefied gas is -42 deg. C under one atmospheric pressure, thereby suppressing the generation of unnecessary LPG evaporated gas.

The heater 150 is provided on the LNG liquefied gas supply line 21 between the customer 20 and the pump 30, specifically between the customer 20 and the LNG / LPG heat exchanger 130, and the pump 30 Can be heated. The pump 30 for supplying the LNG liquefied gas to the heater 150 may be the high pressure pump 32 and the heater 150 may supply the LNG liquefied gas in the subcooled liquid state or the supercritical state to the high pressure pump 32 It is heated while maintaining the pressure of 200 bar to 400 bar to convert it into a liquefied gas in a supercritical state of 30 ° C to 60 ° C and supply it to the customer 20.

Since the LNG liquefied gas supplied from the pump 30 is firstly heated while passing through the LNG / LPG heat exchanger 130 provided upstream of the heater 150 in the present embodiment, It is possible to save heat energy when the LNG liquefied gas is directly supplied and heated to the temperature required by the customer 20.

The heater 150 heats the LNG liquefied gas using glycol water supplied from steam or a glycol heater (not shown) supplied through a boiler (not shown), or heats the LNG liquefied gas using electric energy Or the LNG liquefied gas can be heated using waste heat generated from a generator or other equipment provided on the ship.

As described above, in the present embodiment, the LPG evaporation gas generated in the LPG storage tank 10 is heat-exchanged with the LNG liquefied gas that is relatively low temperature supplied from the LNG storage tank 10 to the customer 20, The LNG liquefied gas supplied from the LPG storage tank 10 to the customer 20 is configured to be heat-exchanged with the relatively hot LPG evaporated gas generated in the LPG storage tank 110, whereby the LPG evaporated gas can be prevented from being discarded, It is possible not only to improve the degree of recycling of the evaporation gas but also to re-liquefy the LPG evaporation gas without any additional liquefaction device, thereby reducing the installation of the liquefaction device and the facility air flow, The amount of heat required for vaporizing the liquefied gas can be sufficiently obtained from the LPG vaporized gas, and the energy efficiency of the LNG fuel supplied to the customer can be improved.

2: Liquefied gas processing system 10: LNG storage tank
16: LNG evaporation gas discharge line 20:
21: LNG liquefied gas supply line 30: pump
31: boosting pump 32: high pressure pump
110: LPG storage tank 115: LPG evaporation gas circulation line
120: LPG evaporative gas compressor 130: LNG / LPG heat exchanger
140: Pressure reducer 150: Heater

Claims (12)

A first liquefied gas supply line connected from the first liquefied gas storage tank to a consumer site;
A pump installed on the first liquefied gas supply line;
A second liquefied gas circulation line for liquefying and circulating the generated gas generated in the second liquefied gas storage tank to the second liquefied gas storage tank;
A first liquefied gas supply line between the customer and the pump, and a liquefied gas heat exchanger provided on the second liquefied gas circulation line;
A compressor installed in the second liquefied gas circulation line upstream of the liquefied gas heat exchanger; And
And a decompressor installed in the second liquefied gas circulation line downstream of the liquefied gas heat exchanger,
The first liquefied gas has a lower boiling point than the second liquefied gas and the evaporated gas generated from the second liquefied gas is liquefied by the cold heat of the first liquefied gas in the liquefied gas heat exchanger The liquefied gas processing system comprising: The method according to claim 1,
Wherein the first liquefied gas is LNG,
The second liquefied gas is LPG,
The first liquefied gas supply line is an LNG liquefied gas supply line,
The second liquefied gas circulation line is an LPG evaporation gas circulation line,
The liquefied gas heat exchanger is an LNG / LPG heat exchanger,
Characterized in that the compressor is an LPG evaporative gas compressor. 3. The LPG evaporative gas compressor according to claim 2,
And the LPG gas is supplied to the LNG / LPG heat exchanger by being installed in the LPG evaporative gas circulation line on the side where the LPG evaporation gas is discharged from the LPG storage tank, and compressing the LPG evaporative gas. The method of claim 3, wherein the LPG evaporation gas, which has passed through the LPG evaporative gas compressor,
The pressure is higher than the pressure of the LPG vapor gas discharged from the LPG storage tank,
Wherein the temperature is higher than the LPG evaporation gas discharged from the LPG storage tank. 3. The LNG / LPG heat exchanger according to claim 2,
Wherein the LNG liquefied gas discharged from the pump through the LNG liquefied gas supply line and the LPG evaporated gas discharged from the LPG evaporative gas compressor through the LPG evaporative gas circulation line are heat exchanged with each other. 6. The method of claim 5,
Wherein the LNG / LPG heat exchanger loses heat to be re-liquidated and is recovered to the LPG storage tank. 6. The method of claim 5, wherein the LPG evaporated gas passed through the LNG /
The pressure is equal to or lower than the pressure of the LPG evaporating gas through the LPG evaporative gas compressor,
Wherein the temperature is lower than the temperature of the LPG evaporation gas through the LPG evaporative gas compressor. 6. The method of claim 5, wherein the LNG liquefied gas, which has passed through the LNG / LPG heat exchanger,
The pressure is equal to or lower than the pressure of the LPG liquefied gas passed through the pump,
Wherein the temperature is higher than the temperature of the LPG liquefied gas passed through the pump. 3. The apparatus according to claim 2,
An LPG evaporation gas discharged from the LPG storage tank is installed in the LPG evaporation gas circulation line through which the LPG evaporation gas compressor and the LNG / LPG heat exchanger are returned to the LPG storage tank, and the LPG evaporation gas is decompressed And is returned to the LPG storage tank. 10. The method according to claim 9, wherein the LPG evaporation gas,
Pressure is equal to the pressure of the LPG evaporating gas discharged from the LPG storage tank,
Wherein the temperature is equal to or lower than the temperature of the LPG evaporation gas passed through the LNG / LPG heat exchanger. 3. The pump according to claim 2,
A high pressure pump for pressurizing the LNG discharged from the LNG storage tank, and a boosting pump. 3. The method of claim 2,
And a heater is provided on the LNG liquefied gas supply line between the demander and the pump.
KR20130118012A 2013-10-02 2013-10-02 A Treatment System and Method of Liquefied Gas KR20150039437A (en)

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