KR20150080087A - A Treatment System Liquefied Gas - Google Patents

A Treatment System Liquefied Gas Download PDF

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Publication number
KR20150080087A
KR20150080087A KR1020130166854A KR20130166854A KR20150080087A KR 20150080087 A KR20150080087 A KR 20150080087A KR 1020130166854 A KR1020130166854 A KR 1020130166854A KR 20130166854 A KR20130166854 A KR 20130166854A KR 20150080087 A KR20150080087 A KR 20150080087A
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South Korea
Prior art keywords
liquefied
storage tank
gas
liquefied gas
nitrogen
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KR1020130166854A
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Korean (ko)
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허희승
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현대중공업 주식회사
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Priority to KR1020130166854A priority Critical patent/KR20150080087A/en
Publication of KR20150080087A publication Critical patent/KR20150080087A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy

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

Abstract

The present invention relates to a liquefied gas treatment system comprising: a liquefied gas storage tank which is connected to a fueling source by a liquefied gas fueling line, and to which an evaporation gas supply is connected; a liquid nitrogen storage tank including a liquid nitrogen discharge line; and a heat exchanger arranged on the evaporation gas supply line and the liquid nitrogen discharge line. According to the present invention, in the liquefied gas treatment system, evaporation gas generated inside the liquefied gas storage tank at the time of bunkering liquefied gas is heat-exchanged with liquid nitrogen, by which re-liquefied evaporation gas is capable of being returned to the liquefied gas storage tank or being supplied as fuel to a demander, so energy can be reduced due to recycling the evaporation gas, and energy efficiency can be increased.

Description

Description of the Related Art A Treatment System Liquefied Gas

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 obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. 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 a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

However, since the liquefied gas is kept in a liquefied state by increasing the pressure or lowering the temperature, it is important to secure the heat insulating property of the liquefied gas storage tank because the phase change due to external heat penetration is a concern. However, since the liquefied gas storage tank can not achieve perfect heat insulation, a part of the liquefied gas stored in the liquefied gas storage tank is phase-changed into the evaporated gas which is the gas by heat transmitted from the outside.

When the internal pressure of the liquefied gas storage tank exceeds the pressure that can be tolerated by the liquefied gas storage tank, the liquefied gas storage tank The tank may be damaged.

Therefore, conventionally, in order to keep the internal pressure of the liquefied gas storage tank at a constant level, a method has been used in which the evaporation gas is discharged to the outside to lower the internal pressure of the liquefied gas storage tank, if necessary. Or the evaporation gas was discharged to the outside of the liquefied gas storage tank, and then liquefied by using a separate liquefaction device and then recovered again into the liquefied gas storage tank.

However, when the evaporation gas is merely discharged to the outside, a problem of contamination of the external environment may occur, and in the case of using the re-liquefaction device, there arises a problem such as a cost and manpower required for installing and operating the liquefaction device. Therefore, it is required to develop an effective treatment method of the evaporation gas generated by external heat penetration.

In addition, the liquefied gas storage tank maintains a state of being higher than the temperature of the liquefied gas in which the internal temperature is injected by natural thermal infiltration from the outside while being empty, and bunching the liquefied gas from the main source to the liquefied gas storage tank, The liquefied gas supplied to the liquefied gas storage tank is vaporized to generate a large amount of boil-off gas (BOG). In the conventional method, the internal pressure of the liquefied gas storage tank amplified by the generated vapor gas In order to reduce the risk of damaging the tank, the evaporation gas is merely discharged to the outside or burned, but the evaporation gas can not be utilized at all, resulting in a waste of energy. Therefore, there is a need to develop an effective treatment method of evaporated gas generated in the liquefied gas storage tank at the time of liquefying gas bunkering.

This prior art is disclosed in Korean Patent Registration No. 10-1138401 (Registered on Apr. 13, 2012).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquefied gas storage tank which is capable of maintaining a liquefied gas storage tank at an internal temperature lower than a boiling point of the liquefied gas, Nitrogen and liquefied nitrogen can cool down the liquefied gas storage tank so that the initial liquefied gas can be brought into a subcooled state during the subsequent bunkering so that the generation of evaporation gas inside the liquefied gas storage tank can be suppressed The present invention relates to a liquefied gas processing system.

Another object of the present invention is to provide a liquefied gas storage tank capable of returning the re-liquefied evaporated gas to the liquefied gas storage tank or supplying the liquefied gas to the customer by heat-exchanging the evaporated gas generated in the liquefied gas storage tank with the liquefied nitrogen during the liquefied gas bunkering And a liquefied gas processing system capable of reducing energy by recycling evaporated gas.

It is still another object of the present invention to provide a liquefied gas storage tank which is capable of exchanging evaporated gas generated in a liquefied gas storage tank of a liquefied gas carrier or a propulsion line with liquefied nitrogen during liquefied gas bunching, Not only can the re-liquefied evaporated gas be fed into the liquefied gas storage tank of the bunkerability, but can be supplied as fuel to the demanded place of the bunkering ship, thereby saving energy by recycling the evaporated gas The present invention is intended to provide a liquefied gas processing system capable of smoothly liquefying liquefied gas from a bunkerable liquefied gas storage tank to a liquefied gas carrier or a liquefied gas storage tank of a propulsion line.

It is a further object of the present invention to provide a method and apparatus for heat exchange of evaporated gas generated in the liquefied gas storage tank with liquefied nitrogen at the time of liquefied gas bunkering and returning the liquefied evaporated gas to the liquefied gas storage tank In addition, since vaporized liquefied nitrogen can cool down or purgage the liquefied gas supply line between the liquefied gas storage tank and the customer and the main equipment therearound, And to provide a liquefied gas processing system capable of improving the efficiency of the fuel supply system.

A liquefied gas processing system according to an aspect of the present invention includes: a liquefied gas storage tank connected to a main source by a liquefied gas lubrication line and to which an evaporation gas supply line is connected; A liquefied nitrogen storage tank having a liquefied nitrogen effluent line; And a heat exchanger provided on the evaporative gas supply line and the liquefied nitrogen discharge line.

Specifically, it may further include a customer connected to the liquefied gas storage tank by a liquefied gas supply line.

Specifically, the heat exchanger may cause heat exchange between the relatively high temperature evaporated gas flowing out of the liquefied gas storage tank and the relatively low temperature liquefied nitrogen flowing out of the liquefied nitrogen storage tank during bunkering.

Specifically, the heat-exchanged evaporated gas may be returned to the liquefied gas storage tank through a first evaporated gas return line branched from the evaporated gas supply line at a rear end of the heat exchanger.

Specifically, the evaporation gas supply line may further include a temporary storage tank installed downstream of the heat exchanger.

Specifically, the temporary storage tank may be connected to the liquefied gas storage tank by a second evaporative gas return line, and return liquefied evaporative gas to the liquefied gas storage tank through the second evaporative gas return line .

Specifically, the temporary storage tank may be connected to the customer by the evaporation gas supply line, and may supply the non-liquefied evaporation gas to the demander through the evaporation gas supply line.

Specifically, the temporary storage tank may be a gas-liquid separator.

The liquefied gas processing system according to the present invention is characterized in that the liquefied gas storage tank is cooled down with vaporized liquefied nitrogen (nitrogen gas) and liquefied nitrogen to maintain the internal temperature of the liquefied gas storage tank below the boiling point of the liquefied gas before the liquefied gas bunching, The first liquefied gas can be made to be in a subcooled state during the subsequent bunkering so that the evaporation gas can be prevented from being generated in the liquefied gas storage tank and a separate system for treating the evaporated gas can be provided So that it is possible to reduce the facility flow.

Further, the liquefied gas processing system according to the present invention is a system for heat-exchanging evaporated gas generated in the liquefied gas storage tank with liquefied nitrogen at the time of liquefied gas bunkering, returning the re-liquefied evaporated gas to the liquefied gas storage tank, The energy can be saved by recycling the evaporation gas, and the energy efficiency can be increased.

Further, the liquefied gas processing system according to the present invention is a system for heat-exchanging evaporated gas generated in the liquefied gas storage tank of a liquefied gas carrier or propulsion line with liquefied nitrogen at the time of liquefied gas bunching, And it is possible to supply the refueled gas to the demand site of the bunkerability by returning the re-liquefied evaporation gas to the liquefied gas storage tank of the bunkerability, or by supplying the fuel to the demand place of the bunkering ship, thereby saving energy by recycling the evaporation gas The energy efficiency can be increased and liquefied gas can be smoothly supplied from the bunker-able liquefied gas storage tank to the liquefied gas carrier or the liquefied gas storage tank of the propulsion line.

Further, the liquefied gas processing system according to the present invention is a system in which liquefied gas is heat-exchanged with liquefied nitrogen generated in the liquefied gas storage tank during liquefied gas bunkering, and the liquefied vaporized gas is returned to the liquefied gas storage tank, Fuel can be supplied to the liquefied gas storage tank and the liquefied gas supply line between the liquefied gas storage tank and the customer with the vaporized liquefied nitrogen and the surrounding main equipment can be cooled down or purged, The recycling of the gas not only saves energy, it also increases the energy efficiency and improves the efficiency of the fuel supply system.

1 is a configuration diagram of a liquefied gas processing system according to a first embodiment of the present invention.
2 is a configuration diagram of a liquefied gas processing system according to a second embodiment of the present invention.
3 is a configuration diagram of a liquefied gas processing system according to a third embodiment of the present invention.
4 is a configuration diagram of a liquefied gas processing system according to a fourth embodiment of the present invention.
5 is a configuration diagram of a liquefied gas processing system according to a fifth 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 configuration diagram of a liquefied gas processing system according to a first embodiment of the present invention.

1, the liquefied gas processing system 100 according to the first embodiment of the present invention includes a main source 110, a liquefied gas storage tank 120, a customer 130, a liquefied nitrogen (LN 2 ) And a storage tank 140.

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. For convenience, LNG can be used to mean both NG (natural gas) as well as NG as a supercritical state for the sake of convenience. The evaporation gas generated from the LNG includes not only gaseous evaporation gas but also liquefied evaporation gas Can be used to mean.

In addition, the liquefied nitrogen can be used to mean nitrogen (LN 2 ) which is generally stored in a liquid state, and when it is not in a liquid state by heating or pressurization, the liquefied nitrogen can be expressed conveniently as liquefied nitrogen. (N 2 ) as well as the liquid / gaseous state in which the liquefied nitrogen has not been completely vaporized.

The main supply source 110 is installed on land or in the sea such as a liquefied gas production bunker or a liquefied gas bunker port to supply liquefied gas to a liquefied gas carrier or liquefied gas propulsion line that carries liquefied gas or uses liquefied gas as fuel. And may be connected to the liquefied gas storage tank 120, which will be described later, by the liquefied gas lube line 101. The main source 110 installed on the sea may include a bunkering ship.

The liquefied gas storage tank 120 may be connected to the mainstream source 110 by the liquefied gas liquefaction line 101 to receive the liquefied gas from the mainstream source 110, For example, a liquefied gas carrier or a liquefied gas propulsion line, and the liquefied gas must be stored in a liquid state, which may be in the form of a pressure tank. It goes without saying that the customer 130 and the liquid nitrogen storage tank 140 to be described later together with the liquefied gas storage tank 120 may be provided in all ships that transport liquefied gas or use liquefied gas as fuel.

The liquefied gas storage tank 120 may be connected to the demander 130 through the liquefied gas supply line 102 to supply fuel to the demander 130 when the liquefied gas propulsion line is provided.

However, the temperature of the liquefied gas to which the internal temperature is supplied by natural thermal infiltration from the outside (for example, the temperature of the liquefied gas is lower than the temperature of the liquefied gas When the liquefied gas is bunkering from the main source 110 to the liquefied gas storage tank 120, the liquefied gas stored in the liquefied gas storage tank 120 The boil-off gas (BOG) is generated.

Since the evaporated gas generated in a large amount may excessively increase the internal pressure of the liquefied gas storage tank 120, there is a danger of damaging the tank. Therefore, the gas may be discharged to the outside through the gas discharge line 105, In the first embodiment, the vaporized nitrogen outflow line 103 and the liquefied nitrogen (NOx) are supplied to the liquefied gas storage tank 120 in the same manner as in the first embodiment, A liquefied nitrogen storage tank 140, which is connected to the outflow line 104, is provided to enable effective treatment of the evaporative gas, which will be described in detail later.

The customer 130 is connected to all the drive engines that can be driven by supplying the liquefied gas from the liquefied gas storage tank 120 through the liquefied gas supply line 102, for example, a MEGI engine, which is a high- A low-pressure engine, a dual fuel engine (DFDE), an engine for power generation, an engine or gas turbine for generating other power, and the like.

A variety of equipment (not shown) including a liquefied gas supply line 102 is provided between the liquefied gas storage tank 120 and the demander 130 so as to stably supply the liquefied gas to the customer 130 Of course.

The liquefied nitrogen storage tank 140 stores liquefied nitrogen and may be connected to the liquefied gas storage tank 120 by a vaporized nitrogen outlet line 103 and a liquefied nitrogen outlet line 104. Here, the liquefied nitrogen has a boiling point of -196 캜, which is relatively lower than the boiling point of the liquefied gas mentioned in this embodiment.

A pressure build-up unit 141 may be provided in the liquid nitrogen storage tank 140 and a first heater 142 and a first valve 144 may be provided on the nitrogen gas outlet line 103 And a pump 146 and a second valve 148 may be provided on the liquefied nitrogen effluent line 104.

The pressure raising device 141 is configured to cause the liquid nitrogen stored in the liquid nitrogen storage tank 140 to circulate back to the liquid nitrogen storage tank 120 via the second heater 141a via the liquid nitrogen circulation line 106 Thereby increasing the internal pressure and temperature of the liquefied nitrogen storage tank 40 so as to control the flow rate or to produce nitrogen gas.

The first heater 142 provided in the nitrogen gas outlet line 103 together with the pressure raising device 141 serves to raise the temperature of the nitrogen gas supplied to the liquefied gas storage tank 120, If the temperature difference between nitrogen and the inside of the liquefied gas storage tank 120 is large, the internal temperature of the liquefied gas storage tank 120 may be reduced by the supplied nitrogen gas, and the tank may be damaged. The vaporized nitrogen supplied to the liquefied gas storage tank 120 serves to cool down the liquefied gas storage tank 120. The vaporized nitrogen is discharged to the atmosphere through the gas discharge line 105, 105 may be provided with a temporary storage tank (not shown) to be recycled.

The pump 146 provided in the liquefied nitrogen effluent line 104 together with the pressure raising device 141 regulates the output according to the temperature condition of the liquefied gas storage tank 120 and is supplied to the liquefied gas storage tank 120 It is possible to efficiently control the flow rate of the liquefied nitrogen. The liquefied nitrogen supplied to the liquefied gas storage tank 120 is vaporized while cooling the liquefied gas storage tank 120. The vaporized liquefied nitrogen is discharged to the atmosphere through the gas discharge line 105, A temporary storage tank (not shown) may be provided on the gas discharge line 105 so as to be recycled.

Each of the first valve 144 provided in the nitrogen gas outlet line 103 and the second valve 148 provided in the liquefied nitrogen outlet line 104 may be an opening control valve, It is possible to cool down the liquefied gas storage tank 120 efficiently by adjusting the opening degree of the first valve 144 or the second valve 148 according to the temperature condition, thereby shortening the bunkering preparation time.

Specifically, considering that the boiling point of the liquid nitrogen stored in the liquid nitrogen storage tank 140 is -196 ° C., the temperature of the relatively high temperature nitrogen gas supplied to the liquefied gas storage tank 120 is, for example, -150 Lt; 0 > C to -50 < 0 > C, and the temperature of the relatively low temperature of the liquefied nitrogen may be, for example, -190 DEG C to -150 DEG C.

In order to shorten the bunkering preparation time, it is preferable to increase the supply amount of the relatively low temperature of the liquefied nitrogen. The temperature of the liquefied gas storage tank 120, which can prevent the damage of the tank due to the internal temperature drop of the liquefied gas storage tank 120, The opening of the second valve 148 can be efficiently widened by monitoring the state, thereby shortening the bunkering preparation time.

The liquefied nitrogen storage tank 140 is connected to the liquefied gas storage tank 120 so that the internal temperature of the liquefied gas storage tank 120 is maintained below the boiling point of the liquefied gas before the liquefied gas bunching, Thereby cooling down the liquefied gas storage tank 120. As a result, the initial liquefied gas can be brought into a subcooled state at the time of bunkering, so that the generation of the evaporated gas can be minimized do.

A method of cooling down the liquefied gas storage tank 120 using the liquefied nitrogen storage tank 140 will be described below.

First, the internal temperature of the liquefied gas storage tank 120 is checked, and the temperature of the nitrogen gas is appropriately elevated by using the first heater 142 so as to prevent the internal temperature of the liquefied gas storage tank 120 from dropping And gradually supplies the nitrogen gas to the liquefied gas storage tank 120 while gradually opening the opening of the first valve 144 until it is completely opened. At this time, the second valve 148 is kept closed. The internal temperature of the liquefied gas storage tank 120 is monitored in real time while the nitrogen gas is being supplied and when the internal temperature of the liquefied gas storage tank 120 is lowered to some extent, the opening of the first valve 144 is gradually The opening degree of the second valve 148 is gradually widened so that nitrogen gas and liquefied nitrogen are mixedly supplied into the liquefied gas storage tank 120. The first valve 144 is closed and the second valve 148 is opened so that liquefied nitrogen is supplied into the liquefied gas storage tank 120 so that the liquefied gas stored in the liquefied gas storage tank 120 Allowing the internal temperature to be maintained at a temperature that allows the initial liquefied gas to subcooled during bunkering. Thereby, the bunkering preparation step is completed, and it is possible to suppress the generation of the evaporation gas inside the liquefied gas storage tank 120 at the time of the bunkering performed subsequently.

The first embodiment of the present invention can be applied to the liquefied gas storage tank 120 with vaporized liquefied nitrogen (nitrogen gas) and liquefied nitrogen so that the internal temperature of the liquefied gas storage tank 120 is kept at a boiling point of the liquefied gas before the liquefied gas bunching 120 can be cooled down so that the initial liquefied gas can be brought into a subcooled state during the subsequent bunkering, so that generation of evaporation gas in the liquefied gas storage tank 120 can be suppressed, It is not necessary to provide a separate system for processing, and thus the number of facilities can be reduced.

2 is a configuration diagram of a liquefied gas processing system according to a second embodiment of the present invention.

2, the liquefied gas processing system 200 according to the second embodiment of the present invention includes a main source 210, a liquefied gas storage tank 220, first and second consumers 230a and 230b, A liquefied nitrogen (LN 2 ) storage tank 240, a heat exchanger 250, and a temporary storage tank 260.

The main source 210 is installed on a land or sea such as a liquefied gas production base or a liquefied gas bunker port to supply liquefied gas to a liquefied gas carrier or liquefied gas propulsion line that carries liquefied gas or uses liquefied gas as fuel. And may be connected to the liquefied gas storage tank 220, which will be described later, by the liquefied gas lubrication line 201. The main source 210 installed on the sea may include a bunkering ship.

The liquefied gas storage tank 220 can be connected to the main source 210 by the liquefied gas lube 201 in order to receive the liquefied gas from the main source 210 and to use the liquefied gas as fuel For example, a liquefied gas carrier or a liquefied gas propulsion line, and the liquefied gas must be stored in a liquid state, which may be in the form of a pressure tank. The first and second consumers 230a and 230b to be described later together with the liquefied gas storage tank 220 and the liquid nitrogen storage tank 240 to be described later and the heat exchanger 250 and the temporary storage tank 260 , And may be provided to all vessels that transport liquefied gas or use liquefied gas as fuel.

When the liquefied gas storage tank 220 is provided in the liquefied gas propulsion line, the liquefied gas storage tank 220 can be connected to the first customer site 230a by the liquefied gas supply line 202 to supply fuel to the first customer site 230a, And is connected to the second customer site 230b by the evaporation gas supply line 203 to supply fuel to the second customer site 230b.

However, the temperature of the liquefied gas to which the internal temperature is supplied by natural thermal infiltration from the outside (for example, the temperature of the liquefied gas is lower than the temperature of the liquefied gas When the liquefied gas is bunkering from the main source 210 to the liquefied gas storage tank 220, the liquefied gas stored in the liquefied gas storage tank 220 The boil-off gas (BOG) is generated.

Since the evaporated gas generated in a large amount may excessively increase the internal pressure of the liquefied gas storage tank 220 and damage the tank, the gas may be discharged through a separate gas discharge line like the gas discharge line 105 of the first embodiment There is a method of discharging the gas to the outside or burning the gas through a gas combustion device (not shown). However, since the evaporation gas is not utilized at all, energy is wasted. In the second embodiment, 240, a heat exchanger 250 to be described later, and a temporary storage tank 260, which will be described later, so as to effectively treat the evaporated gas. The detailed description will be given later.

The first customer 230a is connected to all the drive engines that can be driven by supplying the liquefied gas from the liquefied gas storage tank 220 through the liquefied gas supply line 202, for example, a high pressure engine MEGI A dual fuel engine (DFDE), a low pressure engine, an engine for power generation, an engine or gas turbine for generating other power, and the like.

Various equipment (not shown) including a liquefied gas supply line 202 is provided between the liquefied gas storage tank 220 and the first customer site 230a so as to stably supply the liquefied gas to the first customer site 230a Of course.

The second demand point 230b is a line for supplying the evaporation gas generated from the inside of the liquefied gas storage tank 220 through the evaporation gas supply line 203 to all drive engines capable of being driven, A dual fuel engine (DFDE), a low-pressure engine, an engine for power generation, an engine or a gas turbine for generating other power, and the like.

Various equipment (not shown) including the evaporation gas supply line 203 is provided between the liquefied gas storage tank 220 and the second customer site 230b so as to stably supply the evaporation gas to the second customer site 230b Of course.

In the second embodiment of the present invention, the first and second consumers 230a and 230b are described as consumers, but the evaporation gas supply line 203 connected to the second consumer 230b may be referred to as a first consumer 230a , It is possible to omit the component called the second customer place 230b.

The liquefied nitrogen storage tank 240 stores liquefied nitrogen. Here, the liquefied nitrogen has a boiling point of -196 캜, which is relatively lower than the boiling point of the liquefied gas mentioned in this embodiment. The liquid nitrogen storage tank 240 may be provided with the pressure raising device 141 of the first embodiment described above.

The liquefied nitrogen storage tank 240 supplies the liquefied nitrogen to the heat exchanger 250 to be described later through the liquefied nitrogen outflow line 204 so that the evaporated gas flowing out from the liquefied gas storage tank 220 at the time of bunkering Exchanged, so that the evaporated gas (which may be in a gas-liquid state) in which the temperature is lowered can be returned to the liquefied gas storage tank 220.

The heat exchanger 250 may be provided on the evaporation gas supply line 203 and the liquefied nitrogen effluent line 204.

In the heat exchanger 250, a relatively high temperature evaporation gas (eg, LNG vapor) is supplied from the liquefied gas storage tank 220 through the evaporation gas supply line 203 during bunkering (for example, at -160 ° C. -100 占 폚) and relatively low temperature liquid nitrogen (for example, -196 占 폚) flowing out from the liquid nitrogen storage tank 240 through the liquid nitrogen outflow line 204 can be mutually heat exchanged.

Through this heat exchange, the evaporation gas is liquefied by taking cold heat from the liquefied nitrogen, and the liquefied evaporation gas (which may be in a gas-liquid state) flows from the evaporation gas supply line 203 at the rear end of the heat exchanger 250 to the first evaporation gas It returns to the liquefied gas storage tank 220 through the return line 203a to lower the internal temperature of the liquefied gas storage tank 220 so that the generation of the evaporated gas during the bunkering can be suppressed and also the liquefied evaporated gas (Which may be in a vapor state) may be supplied to the temporary storage tank 260, which will be described later, installed in the evaporation gas supply line 203 downstream of the heat exchanger 250, so that the processing of the evaporated gas re-liquefied in the temporary storage tank 260 Can be easily performed. On the other hand, the liquefied nitrogen is vaporized by obtaining heat from the evaporated gas, and the vaporized liquefied nitrogen is discharged to the atmosphere through the gas discharge line 205 connected to the rear end of the heat exchanger 250, A temporary storage tank (not shown) may be provided and recycled.

The temporary storage tank 260 may be installed in the evaporation gas supply line 203 between the heat exchanger 250 and the second customer 230b and may temporarily store evaporative gas via the heat exchanger 250 have.

The temporary storage tank 260 may be a gas-liquid separator and return the evaporated gas liquefied in the heat exchanger 250 to the liquefied gas storage tank 220 through the second evaporative gas return line 203b, , The internal temperature of the liquefied gas storage tank 220 is lowered, so that generation of evaporative gas during the bunkering can be suppressed. The temporary storage tank 260 also supplies the un-liquefied evaporated gas to the second customer site 230b through the evaporation gas supply line 203 to be used as fuel. The temporary storage tank 260 temporarily stores the evaporated gas in a liquefied or non-liquefied state so that it can be recycled for use other than the above-mentioned purpose.

3 is a configuration diagram of a liquefied gas processing system according to a third embodiment of the present invention.

3, the liquefied gas processing system 300 according to the third embodiment of the present invention includes a main source 310, a liquefied gas storage tank 320, first and second consumers 330a and 330b, A liquefied nitrogen (LN 2 ) storage tank 340, a heat exchanger 350, and a temporary storage tank 360. These components are only indicated by different reference numerals in the drawings, The same components as those of the liquefied gas processing system 200 according to the first embodiment may be the same as those of the liquefied gas processing system 200 according to the first embodiment. Therefore, detailed descriptions of the same components will not be repeated here, and only differences will be described below.

Among the components of the liquefied gas processing system 200 according to the second embodiment, the liquefied gas storage tank 220, the first and second consumers 230a and 230b, the liquefied nitrogen storage tank 240, the heat exchanger 250 For example, a liquefied gas carrier or a liquefied gas propulsion line, the temporary storage tank 260 may be provided in any vessel that carries liquefied gas or uses liquefied gas as a fuel, but the liquefied gas processing according to the third embodiment The liquefied gas storage tank 320, the first and second consumers 330a and 330b, the liquefied nitrogen storage tank 340, the heat exchanger 350, and the temporary storage tank 360, among the components of the system 300, And the container line 370 for transporting the container.

The liquefied nitrogen storage tank 340 is not fixed to the container line 370 but may be separately formed in a container shape and configured to be detachable from the container line 70 as required or required. By configuring the liquefied nitrogen storage tank 340 so as to be detachable in a container shape, it is possible to easily install the container in the container loading space of the container line 370 as if the container is loaded, and after the bunkering is completed, So that it is not only advantageous in securing the loading space of the container line 370 but also commonly used for other container ships, thereby effectively performing the bunkering operation.

In the second and third embodiments, the evaporation gas generated in the liquefied gas storage tanks 220 and 320 is heat-exchanged with the liquefied nitrogen during the liquefied gas bunching, and the re-liquefied evaporated gas is supplied to the liquefied gas storage tank 220, and 320) or to be supplied as fuel to the consumers (230b, 330b), energy can be saved by recycling evaporative gas, and energy efficiency can be increased.

4 is a configuration diagram of a liquefied gas processing system according to a fourth embodiment of the present invention.

4, a liquefied gas processing system 400 according to a fourth embodiment of the present invention includes a main source 410, a liquefied gas storage tank 415, a liquefied gas storage tank 420, second and third demand (430a, 430b, 430c), liquid nitrogen (LN 2), the storage tank 440, first and second heat exchangers (450a, 450b), the first and second temporary storage tanks (460a, 460b.

The main fuel supply source 410 is connected to a liquefied gas carrier or a liquefied gas propulsion line that directly transports liquefied gas or uses liquefied gas as fuel or directly supplies liquefied gas to a liquefied gas carrier or bunker The liquefied gas bunker harbor can be installed on land or in the sea such as a liquefied gas producing bunker port or a liquefied gas bunker harbor so as to supply the liquefied gas to the ship 470. A bunkering ship 470 described later by the first liquefied gas lining line 401a, To the liquefied gas storage tank 415 of the liquefied gas storage tank 415.

The liquefied gas reservoir tank 415 is provided with a bunkering sheath (reservoir) 418 for reserving the liquefied gas so as to supply the liquefied gas supplied from the main supply source 410 through the first liquefied gas lube line 401a to the liquefied gas carrier liner or the liquefied gas propulsion line 470, and the liquefied gas must be stored in a liquid state, which may be in the form of a pressure tank. The bunkering ship 470 equipped with the liquefied gas storage tank 415 may be a kind of marine mainstream source. A third customer 430c to be described later together with a liquefied gas storage tank 415, a liquefied nitrogen storage tank 440 to be described later, a first heat exchanger 450a to be described later, and a first temporary storage tank 460a, And may be provided in the bunkering shaft 470.

The liquefied gas storage tank 415 can supply the liquefied gas stored in the liquefied gas storage tank 420, which will be described later, through the second liquefied gas lubrication line 401b, and the liquefied gas stored in the first evaporated gas supply line 403 And may be connected to a third customer 430c to be described later to supply the third customer 430c with evaporative gas as fuel. The first evaporation gas supply line 403 may be combined with the second evaporation gas supply line 404 provided in the vessel 480 to be described later in the bunkering operation.

When the liquefied gas storage tank 415 is empty and the liquefied gas is to be supplied from the main supply source 410, the bunkering operation must be performed. When only the components of the bunkering ship 470 itself are viewed, It will be understood by those skilled in the art that the components of the liquefied gas processing system 200 according to the exemplary embodiment are different from those of the liquefied gas processing system 200 according to the drawings, 415 will not be described in detail. Hereinafter, the case where the liquefied gas storage tank 415 is filled with the liquefied gas will be described.

The liquefied gas storage tank 420 can be connected to the liquefied gas storage tank 415 by the second liquefied gas lubrication line 401b to receive the liquefied gas from the liquefied gas storage tank 415, For example, a liquefied gas carrier or a liquefied gas propulsion line, and it is necessary to store the liquefied gas in a liquid state, in which case it has a form of a pressure tank . The first and second consumers 430a and 430b to be described later and the second heat exchanger 450b and a second temporary storage tank 460b to be described later together with the liquefied gas storage tank 420 are connected to the ship 480 Of course.

When the liquefied gas storage tank 420 is provided in the liquefied gas propulsion line 480, the liquefied gas storage tank 420 is connected to the first demand site 430a by the liquefied gas supply line 402 to supply fuel to the first demand site 430a And is connected to the second demander 430b by the second evaporation gas supply line 404 to supply fuel to the second demander 430b. The liquefied gas storage tank 420 is connected to the second evaporation gas supply line 404 of the vessel 480 at a first evaporation upstream of the first heat exchanger 450a, Gas supply line 403 to be connected to the third customer 430c provided in the bunkering ship 470 to supply fuel to the third customer 430c.

However, the liquefied gas storage tank 420 is heated by the temperature of the liquefied gas to which the internal temperature is supplied by the natural heat infiltration from the outside (for example, the temperature of the liquefied gas supplied from the liquefied gas storage tank 415, When the liquefied gas is LNG liquefied gas, the boiling point is maintained at a higher level than the boiling point of -163 deg. C). When the liquefied gas is bunkering from the liquefied gas storage tank 415 to the liquefied gas storage tank 420, The liquefied gas supplied into the storage tank 420 is vaporized to generate a large amount of boil-off gas (BOG).

In the fourth embodiment, the liquefied nitrogen storage tank 440, a first heat exchanger 450a to be described later, and a first temporary storage tank 460a to be described later are provided in the bunkering ship 470, A second heat exchanger 450b to be described later, and a second temporary storage tank 460b to be described later, so that the evaporative gas can be effectively treated, which will be described later in detail.

The first customer demand 430a is installed in the ship 480 and supplies the liquefied gas from the liquefied gas storage tank 420 through the liquefied gas supply line 402 to all drive engines that can be driven, A high-pressure engine such as a MEGI engine, a low-pressure engine, a dual fuel engine (DFDE), an engine for power generation, an engine or a gas turbine for generating other power, and the like.

A variety of equipment (not shown) including a liquefied gas supply line 402 is provided between the liquefied gas storage tank 420 and the first customer 430a in order to stably supply the liquefied gas to the first customer 430a Of course.

The second demand site 430b is provided in the ship 480 and is connected to all the drive engines 420 that can be driven by receiving the evaporated gas generated in the liquefied gas storage tank 420 through the second evaporation gas supply line 404, For example, a MEGI engine which is a high-pressure engine mounted on a ship, a dual fuel engine (DFDE) which is a low-pressure engine, an engine for power generation, an engine or a gas turbine for generating other power, and the like.

A variety of equipment (not shown) including the second evaporation gas supply line 404 is provided between the liquefied gas storage tank 420 and the second customer 430b in order to stably supply the evaporation gas to the second customer 430b. Of course.

In the fourth embodiment of the present invention, the first and second consumers 430a and 430b are described as consumers. However, the second evaporation gas supply line 404 connected to the second consumer 430b may be referred to as a first consumer (430a), thereby omitting a component called the second customer place (430b).

The third demand point 430c is provided in the bunkering ship 470 and is connected to the first evaporation gas supply line 403 of the bunkering ship 470 coupled to a part of the second evaporation gas supply line 404 of the ship 480 For example, various engines or gas turbines of the bunching ring 470, etc., which can be driven by the evaporation gas generated in the liquefied gas storage tank 420 through the bypass line 440. [

The first and second evaporator gas supply lines 403 and 404 are provided between the liquefied gas storage tank 420 and the third consumer 430c in order to stably supply the evaporated gas to the third customer 430c. It is needless to say that equipment (not shown) is provided.

The liquefied nitrogen storage tank 440 is provided in the bunkering well 470 and stores liquefied nitrogen. Here, the liquefied nitrogen has a boiling point of -196 캜, which is relatively lower than the boiling point of the liquefied gas mentioned in this embodiment. The liquid nitrogen storage tank 440 may be provided with the pressure raising device 141 of the first embodiment described above.

The liquefied nitrogen storage tank 440 supplies liquefied nitrogen to a first heat exchanger 450a of a bunchering ship 470 through a first liquefied nitrogen outflow line 405a of the bunchering ship 470, Exchanged with the evaporated gas flowing out from the liquefied gas storage tank 420 of the ship 480 at the time of the liquefied gas storage tank 415 and the evaporated gas whose temperature has been lowered And return to the second liquefied gas lubrication line 401b at the rear end of the stock tank 415. [

The liquefied nitrogen storage tank 440 is connected to the second heat exchanger 450b of the ship 480 through a second liquefied nitrogen outflow line 405b connecting the bunkering ship 470 and the ship 480 to the second heat exchanger 450b, Nitrogen is supplied to mutually exchange heat with the evaporated gas flowing out from the liquefied gas storage tank 420 of the vessel 480 at the time of bunkering so that evaporated gas (which may be in a vapor state) in which the temperature is lowered is supplied to the liquefied gas storage tank 420, or may be supplied to the first heat exchanger 450a of the bunkering shovel 470.

The first heat exchanger 450a is provided in the bunkering sheath 470 and may be provided on the first evaporative gas supply line 403 and the first liquefied nitrogen discharge line 405a.

In the first heat exchanger 450a, the second evaporation gas supply line 404 of the ship 480 and the first evaporation gas supply line 460 of the bunkering ship 470 coupled thereto from the liquefied gas storage tank 420 during bunkering, (E.g., -160 ° C. to -100 ° C. in the case of LNG evaporation gas) supplied through line 403 and the first liquefied nitrogen effluent from the liquefied nitrogen storage tank 440 (For example, -196 ° C) of relatively low temperature flowing out through the heat exchanger 405a can be mutually heat exchanged.

Through this heat exchange, the evaporation gas is liquefied by taking cold heat from the liquefied nitrogen, and the liquefied evaporation gas (which may be in a vapor state) is branched from the first evaporation gas supply line 403 at the rear end of the first heat exchanger 450a It is possible to return to the liquefied gas storage tank 415 through the first evaporated gas return line 403a to prevent waste of the evaporated gas and to prevent the liquefied evaporated gas (which may be in a vapor state) from flowing into the first heat exchanger 450a, The first temporary storage tank 460a, which will be described later, is installed in the first temporary storage tank 460a. Therefore, the evaporated gas liquefied in the first temporary storage tank 460a can be easily processed.

The liquefied vaporized gas (which may be in a vapor state) is supplied to the liquefied gas storage tank 403 through the third evaporated gas return line 403c branched from the first evaporated gas supply line 403 at the rear end of the first heat exchanger 450a. The flow returns to the second liquefied gas lubrication line 401b at the rear end of the second liquefied gas lubrication line 415 to increase the flow rate of liquefied gas inside the second liquefied gas lubrication line 401b so that the flow rate to the liquefied gas storage tank 420 can be increased .

On the other hand, the liquefied nitrogen is vaporized by getting heat from the evaporated gas, and the vaporized liquefied nitrogen is discharged to the atmosphere through the first gas discharge line 406a connected to the rear end of the first heat exchanger 450a, A temporary storage tank (not shown) may be provided on the line 406a for recycling.

The second heat exchanger 450b may be provided on the ship 480 and may be provided on the second evaporative gas supply line 404 and the second liquefied nitrogen discharge line 405b.

In the second heat exchanger 450b, a relatively high-temperature evaporation gas (for example, LNG vapor) supplied through the second evaporation gas supply line 404 from the liquefied gas storage tank 420 at the time of bunkering , -160 ° C. to -100 ° C.) and relatively low temperature liquefied nitrogen (eg -196 ° C.) flowing out of the liquefied nitrogen storage tank 440 through the second liquefied nitrogen outflow line 405b Heat exchange can be achieved.

Through this heat exchange, the evaporated gas is liquefied by receiving cold heat from the liquefied nitrogen, and the liquefied evaporated gas (which may be in a vapor state) is branched from the second evaporated gas supply line 404 at the rear end of the second heat exchanger 450b It returns to the liquefied gas storage tank 420 through the first evaporation gas return line 404a to lower the internal temperature of the liquefied gas storage tank 420 so that the generation of the evaporation gas during bunkering can be suppressed, Waste of gas can be prevented.

In addition, since the liquefied evaporated gas (which may be in a gas-liquid state) is supplied to the second temporary storage tank 460b to be described later provided on the downstream side of the second heat exchanger 450b, The processing of the evaporated gas can be facilitated.

On the other hand, the liquefied nitrogen is vaporized by heating from the evaporated gas, and the vaporized liquefied nitrogen is discharged to the atmosphere through the second gas discharge line 406b connected to the latter end of the second heat exchanger 450b, A temporary storage tank (not shown) may be provided on the line 406b for recycling.

The first temporary storage tank 460a may be provided in the bunkering ship 470 and installed in the first evaporating gas supply line 403 between the first heat exchanger 450a and the third customer 430c, It is possible to temporarily store the evaporated gas via the first heat exchanger 450a.

The first temporary storage tank 460a may be a gas-liquid separator and returns the evaporated gas liquefied in the first heat exchanger 450a to the liquefied gas storage tank 415 through the second evaporative gas return line 403b . In addition, the first temporary storage tank 460a supplies the non-liquefied vaporized gas to the third customer site 430c through the first vaporized gas supply line 403 to be used as fuel. The first temporary storage tank 460a temporarily stores the evaporated gas in a liquefied or non-liquefied state so that it can be recycled for other uses than those described above.

The second temporary storage tank 460b may be provided in the ship 480 and may be installed in the second evaporative gas supply line 404 between the second heat exchanger 450b and the second consumer 430b, 2 heat exchanger 450b can be temporarily stored.

The second temporary storage tank 460b may be a gas-liquid separator and may return the evaporated gas liquefied in the second heat exchanger 450b to the liquefied gas storage tank 420 through the second evaporated gas return line 404b Thereby lowering the internal temperature of the liquefied gas storage tank 420, so that the generation of evaporative gas during bunkering can be suppressed. In addition, the second temporary storage tank 460b supplies the non-liquefied vaporized gas to the second customer site 430b through the second vaporized gas supply line 404 to be used as fuel. The second temporary storage tank 460b temporarily stores the evaporated gas in a liquefied or non-liquefied state, so that the second temporary storage tank 460b can be recycled for other purposes than those described above.

Thus, in the fourth embodiment, the evaporation gas generated inside the liquefied gas storage tank 420 of the liquefied gas carrier or the propulsion line 480 at the liquefied gas bunching is heat-exchanged with the liquefied nitrogen, The liquefied gas can be returned to the liquefied gas storage tank 420 or supplied as fuel to the second customer 430b as well as returned to the liquefied gas storage tank 415 of the bunkering ship 470, The energy of the liquefied gas can be supplied from the liquefied gas storage tank 415 of the bunkering ship 470 to the liquefied gas storage tank 415 of the bunkering ship 470, It is possible to smoothly supply the liquefied gas to the liquefied gas storage tank 420 of the carrier line or the propulsion line 480.

5 is a configuration diagram of a liquefied gas processing system according to a fifth embodiment of the present invention.

5, the liquefied gas processing system 500 according to the fifth embodiment of the present invention includes a main source 510, a liquefied gas storage tank 520, first and second consumers 530a and 530b, A liquefied nitrogen (LN 2 ) storage tank 540, a heat exchanger 550, a temporary storage tank 560, and a nitrogen gas treatment unit 570.

In the fifth embodiment of the present invention, the remaining components except for the nitrogen-nitrogen processing apparatus 570 are different from the components of the liquefied gas processing system 200 according to the second embodiment of the present invention only in the drawing In order to avoid duplication of description, detailed description of each of the same components will be omitted. A nitrogen monoxide processing apparatus 570, which is a component different from the second embodiment of the present invention, .

The nitrogen nitride processing apparatus 570 is installed between the gas discharge line 505 for discharging the nitrogen gas at the rear end of the heat exchanger 550 and the evaporation gas supply line 502 at the rear end of the liquefied gas storage tank 520 And can cool down or purge the main equipment of the liquefied gas supply line 502 and its vicinity by the nitrogen gas. Nitrogen treatment apparatus 570 may include a distributor 572, a nitrogen nitrogen storage tank 574,

One side of the distributor 572 is connected to the end of the gas discharge line 505 and the other side thereof is connected to one end of the nitrogen purge line 506 and one end of the nitrogen oxide storage line 507. The other end of the nitrogen nitrogen purge line 506 may be connected to the liquefied gas supply line 502 at the end of the liquefied gas storage tank 520 and the other end of the nitrogen oxide storage line 507 may be connected to a nitrogen gas storage tank 574, respectively.

The distributor 572 collects the nitrogen oxides discharged through the gas discharge line 505 and supplies the vaporized nitrogen to the liquefied gas supply line 505 between the liquefied gas storage tank 520 and the first customer 530a, The nitrogen gas is supplied through the nitrogen nitrogen purge line 506 or the nitrogen gas is supplied through the nitrogen gas storage line 507 to the nitrogen gas purge line 506 in order to cool down or purge the main equipment (not shown) To the nitrogen nitrogen storage tank 574 to be described later.

The nitrogen nitrogen storage tank 574 is capable of storing nitrogen nitrogen and temporarily storing the stored nitrogen nitrogen. When a cool down or purging is required, for example, in a liquefied gas bunker, , The stored nitrogen gas is supplied to the nitrogen nitrogen purge line 506 to cool down or purge the main equipment of the liquefied gas supply line 505 and its surroundings.

When the difference between the temperature of the liquefied gas supply line 505 or the temperature inside the main equipment and the temperature of the nitrogen gas is large when the main equipment of the liquefied gas supply line 505 and its vicinity is cooled down or purged by using nitrogen gas It is preferable that the liquefied gas supply line 505 or the main equipment is damaged and the nitrogen gas is completely vaporized at the time of purging so that the first heater 576 is provided on the nitrogen gas purge line 506 Or a second heater 578 on the nitrogen gas storage line 507.

A pump 545 may also be provided on the liquefied nitrogen efflux line 504 between the liquefied nitrogen storage tank 540 and the heat exchanger 550 which is connected to the liquefied nitrogen storage tank 540 The leaking liquefied nitrogen is pressurized toward the heat exchanger 550 to maintain smooth flow.

The vaporization nitrogen treatment apparatus 570 operates during the liquefied gas bunching operation to cool down or purge the liquefied gas supply line 505 and the main equipment around the liquefied gas supply line 505, Thereby facilitating the supply of liquefied gas fuel from the liquefied gas storage tank 520 to the first customer 530a in the preparation stage for operation of the ship during liquefied gas bunkering or after bunkering.

In the fifth embodiment of the present invention, as in the second embodiment of the present invention, the demanders are described as the first and second consumers 530a and 530b. However, the evaporator 530b connected to the second consumer 530b By configuring the gas supply line 503 to be connected to the first demand point 530a, a component called the second demand point 430b can be omitted.

In the fifth embodiment, the evaporated gas generated in the liquefied gas storage tank 520 is exchanged with the liquefied nitrogen during the liquefied gas bunching, and the re-liquefied evaporated gas is returned to the liquefied gas storage tank 520 The liquefied gas supply line 502 between the liquefied gas storage tank 520 and the first demand point 530a and the main equipment in the vicinity of the liquefied gas supply line 502 can be supplied as fuel to the second demand point 530b, So that the energy can be saved by recycling the evaporation gas, the energy efficiency can be increased, and the efficiency of the fuel supply system can be improved.

Although the present invention has been specifically described by categorizing the present invention into the first to fifth embodiments, the present invention is not limited to the first, second, third, fourth, or fifth embodiments, It will be apparent that other embodiments which are expected to be implemented or modified from the respective combinations or modified combinations or combinations of the first to fifth embodiments may also be included in the scope of the present invention.

100, 200, 300, 400, 500: liquefied gas processing system
110, 210, 310, 410, 510:
120, 220, 320, 420, 520: Liquefied gas storage tank
130, 230a, 230b, 330a, 330b, 430a, 430b, 430c, 530a, 530b:
140, 240, 340, 440, 540: Liquefied nitrogen storage tank
141: pressure raising device 141a, 142, 576, 578: heater
146, 545: Pump 144, 148: Valve
250, 350, 450a, 450b, 550: heat exchanger
260, 360, 460a, 460b: temporary storage tank 370: container ship
415: Liquefied gas storage tank 470: Bunkering ship
480: Vessel 570: Nitrogen gas treatment apparatus
572: Dispenser 574: Nitrogen storage tank
101, 201, 301, 401a, 401b, 501: liquefied gas lubrication line
102, 202, 302, 402, 502: liquefied gas supply line
103,: nitrogen gas spill line
104, 204, 304, 405a, 405b, 504: liquefied nitrogen effluent line
105, 205, 305, 406a, 406b, 505:
106: Liquefied nitrogen circulation line
203, 303, 403, 404, 503: an evaporation gas supply line
203a, 203b, 303a, 303b, 404a, 404b, 503a, 503b:
403a, 403b, 403c: Evaporative gas regression line
506: Nitrogen purge line 507: Nitrogen storage line

Claims (8)

A liquefied gas storage tank connected to a main source by a liquefied gas lubrication line and connected to an evaporation gas supply line;
A liquefied nitrogen storage tank having a liquefied nitrogen effluent line; And
And a heat exchanger provided on the evaporative gas supply line and the liquefied nitrogen discharge line. The method according to claim 1,
Further comprising a customer connected to the liquefied gas storage tank by a liquefied gas supply line. The heat exchanger according to claim 1,
Wherein during bunkering, the relatively high temperature evaporated gas leaving the liquefied gas storage tank and the relatively low temperature liquefied nitrogen flowing out of the liquefied nitrogen storage tank are exchanged with each other. 4. The method of claim 3, wherein the heat-
And returned to the liquefied gas storage tank through a first evaporative gas return line branched from the evaporative gas supply line at a rear end of the heat exchanger. The method of claim 3,
Further comprising: a temporary storage tank installed downstream of the heat exchanger in the evaporation gas supply line. 6. The apparatus of claim 5, wherein the temporary storage tank comprises:
And connected to the liquefied gas storage tank by a second evaporative gas return line, and returns the liquefied evaporative gas to the liquefied gas storage tank through the second evaporative gas return line. 6. The apparatus of claim 5, wherein the temporary storage tank comprises:
And supplies the un-liquefied evaporated gas to the customer through the evaporation gas supply line, wherein the liquefied gas is connected to the customer by the evaporation gas supply line. 6. The apparatus of claim 5, wherein the temporary storage tank comprises:
Liquid separator.
KR1020130166854A 2013-12-30 2013-12-30 A Treatment System Liquefied Gas KR20150080087A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109357159A (en) * 2018-11-14 2019-02-19 江苏科技大学 A kind of deep cooling supercritical fluid regasifies experimental system and working method
WO2020226504A1 (en) * 2019-05-09 2020-11-12 Ann Rigmor Nerheim A method and a system for heating lng before it enters a storage tank of a ship or other gas
US11760462B2 (en) 2016-03-31 2023-09-19 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Boil-off gas re-liquefying device and method for ship

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11760462B2 (en) 2016-03-31 2023-09-19 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Boil-off gas re-liquefying device and method for ship
US12006017B2 (en) 2016-03-31 2024-06-11 Hanwha Ocean Co., Ltd. Boil-off gas reliquefication apparatus and method for vessel
CN109357159A (en) * 2018-11-14 2019-02-19 江苏科技大学 A kind of deep cooling supercritical fluid regasifies experimental system and working method
WO2020226504A1 (en) * 2019-05-09 2020-11-12 Ann Rigmor Nerheim A method and a system for heating lng before it enters a storage tank of a ship or other gas

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