KR20230136920A - Fuel providing system used for ship, and liquefied gas fueled ship having the same - Google Patents

Abstract

A marine fuel supply system and a liquefied gas fuel propulsion ship equipped with the same are disclosed. The marine fuel supply system according to an embodiment of the present invention includes a first heat exchanger that precools the fluid compressed by the compression unit by heat exchange with the boil-off gas of the liquefied gas supplied from the storage tank, and a second heat exchanger that liquefies the precooled fluid. A heat exchange unit comprising; A gas-liquid separator that separates the gas-liquid fluid that has passed through the heat exchanger; A boil-off gas supply line that sends the boil-off gas through the first heat exchanger to the compression unit, the first heat exchanger, the second heat exchanger, and the gas-liquid separator; A gas component confluence line that merges the gas components separated by the gas-liquid separator into the front end of the first heat exchanger of the boil-off gas supply line; A first fuel supply line that supplies the liquefied gas supplied from the storage tank to the first consumer through a second heat exchanger; and a pressurization pump provided in the first fuel supply line and compressing the fluid that has passed through the second heat exchanger to suit the fuel supply conditions of the first consumer; including, but not limited to, liquefied gas supplied from the storage tank during cooling for initial startup. flows to the gas-liquid separator through the second heat exchanger and the pressurization pump, and the gas component separated by the gas-liquid separator is recovered to the storage tank through the first heat exchanger.

Description

Marine fuel supply system and liquefied gas fuel propulsion vessel equipped with the same {FUEL PROVIDING SYSTEM USED FOR SHIP, AND LIQUEFIED GAS FUELED SHIP HAVING THE SAME}

The present invention relates to a marine fuel supply system and a liquefied gas fuel propulsion ship equipped with the same.

As the International Maritime Organization (IMO)'s regulations on the emission of greenhouse gases and various air pollutants are strengthened, the shipbuilding and shipping industry is using natural gas, a clean energy source, instead of using existing fuels such as heavy oil and diesel oil. It is increasingly being used as fuel gas for ships.

Natural gas, which is widely used among fuel gases, contains methane as its main ingredient, and is usually converted to liquefied gas with its volume reduced to 1/600 and stored in a storage tank.

Inside the storage tank where the liquefied gas is stored, evaporation gas is generated due to the influx of external heat. This can be supplied as fuel to the customer, but if the flow rate exceeds the fuel supply required by the customer, it can be re-liquefied and recovered to the storage tank. There is a need.

In addition, the evaporation gas generated in the storage tank can be compressed to high pressure (approximately 300 barg) through a compression unit including a multi-stage compressor of about 5 stages and then supplied as fuel for a high-pressure injection engine. At this time, various facilities such as piping related to the high-pressure compression section must be designed accordingly to withstand high pressure, and a separate large-capacity gas tank can be applied to lower the internal settle-out pressure when the operation is stopped.

In addition, the boil-off gas compressed to high pressure through the compression unit can be supplied to low-pressure consumers that require low-pressure fuel, such as generators and boilers. To achieve this, the boil-off gas compressed at high pressure must be expanded and converted into low-pressure gas of around 8 barg, and a heater can be used to compensate for the rapid drop in gas temperature due to mass decompression.

As such, in the past, there was an inefficient problem in operating the entire fuel supply system, such as performing a large amount of decompression in order to supply boil-off gas compressed at high pressure as fuel to low-pressure consumers. As related technology, please refer to the existing Korean Patent No. 10-1613236 (registered on April 11, 2016).

Meanwhile, in the past, for the initial start-up of the fuel supply system, the liquefied gas supplied from the storage tank was sent to a pressurized pump and then returned to the storage tank to cool down the line through which the liquefied gas flows.

However, as described above, for example, if the fuel supply system includes equipment for processing evaporation gas generated inside the storage tank, the conventional method requires cooling of the overall equipment included in the fuel supply system for initial startup. There is difficulty in performing the down operation, and there is a problem that a separate cool down line must be provided. As related technology, please refer to the existing Korean Patent No. 10-1526770 (registration date: June 1, 2015).

Korean Patent No. 10-1613236 (registered on April 11, 2016) Korean Patent No. 10-1526770 (registration date: 2015.06.01)

An embodiment of the present invention is a marine fuel supply system that can increase the efficiency of cooling work by flowing liquefied gas throughout the system during cooling work for initial startup without having a separate cool-down line, and a liquefied gas equipped with the same. We want to provide fuel-propelled ships.

In addition, we aim to provide a marine fuel supply system that can increase operational efficiency by compressing boil-off gas supplied from a storage tank to low pressure and supplying it to low-pressure consumers, and a liquefied gas fuel propulsion ship equipped with the same.

In addition, it is intended to provide a marine fuel supply system that can convert and supply liquefied gas supplied from a storage tank to suit the fuel supply conditions of low-pressure demand and a liquefied gas fuel propulsion ship equipped with the same.

According to one aspect of the present invention, a heat exchanger comprising a first heat exchanger that precools the fluid compressed by the compression unit by heat exchange with the boil-off gas of the liquefied gas supplied from the storage tank, and a second heat exchanger that liquefies the precooled fluid. wealth; a gas-liquid separator that separates gas-liquid from the fluid passing through the heat exchanger; A boil-off gas supply line that sends the boil-off gas through the first heat exchanger to the compression unit, the first heat exchanger, the second heat exchanger, and the gas-liquid separator; a gas component confluence line that merges the gas components separated by the gas-liquid separator into the front end of the first heat exchanger of the boil-off gas supply line; A first fuel supply line that supplies the liquefied gas supplied from the storage tank to a first consumer through the second heat exchanger; And a pressurization pump provided in the first fuel supply line and compressing the fluid that has passed through the second heat exchanger to suit the fuel supply conditions of the first demand source; including, when cooling for initial start-up, from the storage tank. A marine fuel supply system is provided in which the supplied liquefied gas flows to the gas-liquid separator through the second heat exchanger and the pressurization pump, and the gas component separated by the gas-liquid separator is recovered to the storage tank through the first heat exchanger. It can be.

A first cooling medium recovery line is connected to the pressurization pump and the storage tank, and a first control valve is provided, and a second control valve is provided, and the gas and liquid of the boil-off gas supply line is branched from the first cooling medium recovery line. It further includes a cooling line connected to the front end of the separator, wherein the liquefied gas supplied from the storage tank during the cooling operation for the initial start passes through the second heat exchanger and the pressurizing pump through the first fuel supply line and is then cooled. It may flow toward the gas-liquid separator through the line.

A temperature measuring device provided at the rear end of the first heat exchanger of the boil-off gas supply line, a second cooling medium recovery line branched from the rear end of the first heat exchanger of the boil-off gas supply line and connected to the storage tank, and the second cooling medium recovery line It further includes a third control valve provided in the line, and the opening and closing of one or more of the first control valve to the third control valve may be controlled based on the value measured by the temperature measuring device.

A first vaporizer that vaporizes the fluid compressed by the pressurization pump according to the fuel supply conditions of the first consumer, and a vaporizer that branches off from the rear end of the second heat exchange part of the first fuel supply line and requires low-pressure fuel. It may further include a second fuel supply line connected to the second demand source, and a second vaporizer provided in the second fuel supply line and vaporizing the fluid that has passed through the heat exchanger according to the fuel supply conditions of the second demand source.

It may further include a compressed gas supply line branched between the compression unit and the heat exchange unit and connected to the rear end of the second vaporizer of the second fuel supply line, and supplying the fluid passing through the compression unit to the second demand source. there is.

The compression unit may include a preheater that heats the fluid, a low-pressure compressor that compresses the fluid heated by the preheater to a low pressure to suit the fuel supply conditions of the second demand source, and a cooler that cools the compressed fluid. there is.

It is provided between the heat exchange part of the boil-off gas supply line and the gas-liquid separator, and may further include an expander that expands the fluid passing through the heat exchange part.

According to another aspect of the present invention, a liquefied gas fuel propulsion ship equipped with the above-described fuel supply system can be provided.

The marine fuel supply system according to an embodiment of the present invention and the liquefied gas fuel propulsion ship equipped with the same provide cooling work by flowing liquefied gas throughout the system during cooling work for initial startup without having a separate cool-down line. Efficiency can be increased.

In addition, operational efficiency can be increased by compressing the boil-off gas supplied from the storage tank to low pressure and supplying it to low-pressure consumers.

In addition, the liquefied gas supplied from the storage tank can be converted and supplied to suit the fuel supply conditions of the low-pressure consumer.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Figure 1 shows a fuel supply system for ships according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

Figure 1 shows a fuel supply system for ships according to an embodiment of the present invention.

Referring to Figure 1, a first heat exchanger 121 that precools the fluid compressed by the compression unit 110 according to an embodiment of the present invention by heat exchange with the boil-off gas of the liquefied gas supplied from the storage tank 102; , a heat exchange unit 120 including a second heat exchanger 122 for liquefying the pre-cooled fluid, a gas-liquid separator 140 for separating gas and liquid from the fluid passing through the heat exchange unit 120, and a first heat exchanger for evaporating gas. To the boil-off gas supply line (L11) which is sent through the compressor (121) to the compression unit (110), the first heat exchanger (121), the second heat exchanger (122), and the gas-liquid separator (140), and the gas-liquid separator (140). A gas component confluence line (L21) that merges the separated gas components into the front end of the first heat exchanger (121) of the boil-off gas supply line (L11), and the liquefied gas supplied from the storage tank (102) to the second heat exchanger ( 122), which is provided in the first fuel supply line (L12) and a first fuel supply line (L12) supplied to the first consumer (E1), and the fluid that has passed through the second heat exchanger (122) is supplied to the first consumer (E1). It includes a pressurization pump 150 that compresses the fuel supply conditions of (E1), and the liquefied gas supplied from the storage tank 102 during cooling for initial start-up is a second heat exchanger 122 and a pressurization pump 150. ) flows to the gas-liquid separator 140, and the gas component separated by the gas-liquid separator 140 is recovered to the storage tank 102 through the first heat exchanger 121.

In addition, the marine fuel supply system 100 connects the pressurization pump 150 and the storage tank 102, and includes a first cooling medium recovery line (L31) equipped with a first control valve (V1), and a second control valve ( V2) is provided, and includes a cooling line (L32) branched from the first cooling medium recovery line (L31) and connected to the front end of the gas-liquid separator (140) of the boil-off gas supply line (L11), and performing cooling operations for initial startup. The liquefied gas supplied from the storage tank 102 passes through the second heat exchanger 122 and the pressurization pump 150 through the first fuel supply line (L12) and then through the cooling line (L32) to the gas-liquid separator (140). ) can flow towards.

In addition, the marine fuel supply system 100 includes a temperature gauge 180 provided at the rear of the first heat exchanger 121 of the boil-off gas supply line (L11), and a first heat exchanger 121 of the boil-off gas supply line (L11). It includes a second cooling medium recovery line (L33) branched from the rear end and connected to the storage tank 102, and a third control valve (V3) provided in the second cooling medium recovery line (L33), and The opening and closing of one or more of the first control valve (V1) to the third control valve (V3) may be controlled based on the value measured by the control valve.

In addition, the marine fuel supply system 100 includes a first vaporizer 160 that vaporizes the fluid compressed by the pressurization pump 150 according to the fuel supply conditions of the first demand source (E1), and a first fuel supply line (L12) ) is branched from the rear end of the second heat exchange unit 120 and is provided in the second fuel supply line (L13) and the second fuel supply line (L13) connected to the second consumer (E2) requiring low-pressure fuel. , It may include a second vaporizer 170 that vaporizes the fluid that has passed through the heat exchanger 120 according to the fuel supply conditions of the second demand source (E2).

In addition, the marine fuel supply system 100 is branched between the compression unit 110 and the heat exchange unit 120 and connected to the rear end of the second carburetor 170 of the second fuel supply line (L13), and the compression unit 110 It may include a compressed gas supply line (L14) that supplies the fluid that has passed through to the second demand source (E2).

In addition, the marine fuel supply system 100 is provided between the heat exchange part 120 of the boil-off gas supply line (L11) and the gas-liquid separator 140, and includes an expander 130 that expands the fluid passing through the heat exchange part 120. may include.

Hereinafter, each component of the fuel supply system 100 will be described in detail.

The fuel supply system 100 is, for example, a liquefied fuel carrier, a liquefied fuel RV (Regasification Vessel), a container ship, a general merchant ship, an LNG FPSO (Floating, Production, Storage and Off-loading), an LNG FSRU (Floating Storage and Regasification Unit), etc. It can be equipped on various ships, including.

In an embodiment of the present invention, application of the fuel supply system 100 to a liquefied gas fuel propulsion ship will be described as an example.

The storage tank 102 may store, for example, LNG (Liquefied Natural Gas) as a liquefied gas, and may include a membrane-type tank or an IMO Type-B tank that stores fuel in a liquefied state while maintaining insulation.

The storage tank 102 is a low-pressure storage tank, and can store LNG at a cryogenic temperature ranging from approximately -150°C to -163°C at a pressure of approximately 0.0 bar to 0.7 bar.

The boil-off gas of the liquefied gas inside the storage tank 102 is supplied through the boil-off gas supply line (L11).

The boil-off gas supply line (L11) transfers the boil-off gas supplied from the storage tank 102 through the first heat exchanger 121 to the compression unit 110, the first heat exchanger 121, the second heat exchanger 122, and Send it to the gas-liquid separator (140).

The first heat exchanger 121 performs heat exchange between the boil-off gas supplied from the storage tank 102 and the fluid passing through the compression unit 110.

At this time, when the gas components separated by the gas-liquid separator 140 are mixed by joining the front end of the first heat exchanger 121 of the boil-off gas supply line L11 through the gas component joining line L21, the first heat exchanger (121) can perform heat exchange between the mixed fluid and the fluid that passed through the compression unit (110). The mixed fluid that has passed through the first heat exchanger (121) flows to the compression unit (110) along the boil-off gas supply line (L11).

The compression unit 110 includes a preheater 111 that heats the fluid, a low pressure compressor 112 that compresses the fluid heated by the preheater 111 to a low pressure in accordance with the fuel supply conditions of the second demand source (E2), and , It may include a cooler 113 that cools the fluid compressed by the low pressure compressor 112.

Specifically, the preheater 111 heats the above-mentioned mixed fluid according to the supply conditions of the compressor 112. At this time, if the compressor 112 is for cryogenic temperatures, the preheater 111 can be omitted.

The compressor 112 compresses the fluid heated by the preheater 111 to suit the fuel supply conditions of the second demand source (E2), which is a low pressure demand source. The compressor 112 may, for example, compress the fluid heated by the preheater 111 to approximately 7 barg to 9 barg.

The cooler 113 cools the fluid compressed by the compressor 112. The temperature of the fluid compressed by the compressor 112 may be controlled by the cooler 113 to match the temperature of the set value.

At least some of the fluid compressed by the compression unit 110 may be supplied as fuel to the second consumer (E2) through the compressed gas supply line (L14), and the flow rate exceeds the fuel supply amount to the second consumer (E2). may be supplied to the heat exchanger 120 and liquefied.

The compressed gas supply line (L14) branches off between the compression unit (110) and the heat exchange unit (120) and is connected to the rear end of the second vaporizer (170) of the second fuel supply line (L13).

Conventionally, it was necessary to compress boil-off gas to high pressure through a compression unit containing a multi-stage compressor and then decompress it in large quantities to supply it as fuel to low-pressure consumers. However, through an embodiment of the present invention, the fluid is compressed by the compression unit 110. It can be compressed to low pressure and then supplied directly to the second consumer (E2).

The heat exchange unit 120 can re-liquefy the flow rate exceeding the fuel supply amount of the second demand source (E2) among the fluid compressed by the compression unit 110, and the first heat exchanger 121 and the second heat exchanger ( 122).

The first heat exchanger 121 precools the fluid compressed by the compression unit 110 by exchanging heat with the boil-off gas of the liquefied gas supplied from the storage tank 102. As described above, when the gas components separated by the gas-liquid separator 140 are mixed by joining the front end of the first heat exchanger 121 of the boil-off gas supply line L11 through the gas component joining line L21, the first heat exchanger 121 is mixed. The heat exchanger 121 can perform heat exchange between the mixed fluid and the fluid that passed through the compression unit 110.

The second heat exchanger 122 converts the fluid pre-cooled by the first heat exchanger 121 of the boil-off gas supply line (L11) into liquefied gas supplied from the storage tank 102 through the first fuel supply line (L12). Heat exchange. Through this, the liquefied gas supplied from the storage tank 102 is re-liquefied by using cold heat, and the liquefied gas supplied from the storage tank 102 is pressurized by the second heat exchanger 122 (150). It is converted to a state suitable for , and as a result, the capacity of the first vaporizer 160 can be reduced.

The heat exchange unit 120 may include a first heat exchanger 121 and a second heat exchanger 122, or, in another example, may be manufactured as a single 3-stream heat exchanger.

Thereafter, the fluid liquefied by the heat exchanger 120 is supplied to the expander 130 of the boil-off gas supply line L11, expands, and is then separated into a gas component and a liquid component by the gas-liquid separator 140.

The gas component separated by the gas-liquid separator 140 joins the front end of the first heat exchanger 121 of the boil-off gas supply line L11 through the gas component joining line L21.

Through this, the cold heat of the gas component separated by the gas-liquid separator 140 in the first heat exchanger 121 can be used to pre-cool the boil-off gas supplied from the storage tank 102.

The liquid component separated by the gas-liquid separator 140 is recovered to the storage tank 102 through the liquid component recovery line (L22). The liquid component separated by the gas-liquid separator 140 can be used to adjust the pressure inside the storage tank 102. The liquid component separated by the gas-liquid separator 140 may be supplied to the bottom of the storage tank 102, or may be sprayed into the gas space inside the storage tank 102 by a nozzle (not shown).

The liquefied gas stored in the storage tank 102 is pumped by the pump (P) provided inside the storage tank 102, passes through the heat exchanger 120, and then passes through the first fuel supply line (L12) to the first demand source ( E1), and at least some of it may be supplied to the second demand source (E2), which requires fuel of a lower pressure than the first demand source (E1), through the second fuel supply line (L13).

The first consumer (E1) is combustion with fuel gas of high pressure (approximately 150-700 bar) injection engines such as the ME-GI engine (Gas Injection engine of Man B&W) and medium-pressure (approximately 16-18 bar) X-DF engines. It may include a medium pressure gas injection engine capable of

The second consumer (E2) may include a power generation engine, a boiler, etc., and in the case of a liquefied gas fuel-propelled ship, a significant amount of fuel is consumed in the boiler or a power generation engine, so the liquefied gas stored in the storage tank 102 At least part of it can be supplied to the second demand source (E2) through the second fuel supply line (L13).

The liquefied gas supplied from the storage tank 102 flows through the first fuel supply line (L12) and is combined with the fluid that passed through the first heat exchanger (121) in the second heat exchanger (122) of the boil-off gas supply line (L11). After the heat is exchanged and cold heat is transferred, it can be supplied to the first consumer (E1) through the pressurizing pump 150 and the first vaporizer 160.

The pressurizing pump 150 provided in the first fuel supply line (L12) pressurizes the fluid passing through the heat exchanger 120 according to the fuel supply conditions of the first demand source (E1).

And, the first vaporizer 160 vaporizes the fluid pressurized by the pressure pump 150 in accordance with the fuel supply conditions of the first demand source E1.

At least some of the liquefied gas supplied from the storage tank 102 is smaller than the first consumer (E1) through the second fuel supply line (L13) branched from the rear end of the heat exchanger 120 of the first fuel supply line (L12). It can be supplied as fuel to the second consumer (E2) that requires pressure fuel.

The second vaporizer 170 provided in the second fuel supply line (L13) vaporizes the liquefied gas according to the fuel supply conditions of the second consumer (E2).

The fluid vaporized by the second carburetor (170) is supplied to the second consumer (E2) along with the fluid that joins the rear end of the second carburetor (170) of the second fuel supply line (L13) through the compressed gas supply line (L14). Can be supplied as fuel.

Meanwhile, for the initial startup of the fuel supply system 100, cooling work is required for each equipment that constitutes the fuel supply system 100.

To this end, first, the liquefied gas supplied from the storage tank 102 flows through the second heat exchanger 122 through the first fuel supply line (L12) to the pressurizing pump 150.

Then, the liquefied gas flows toward the gas-liquid separator 140 through a cooling line (L32) branched from the first cooling medium recovery line (L31) connecting the pressurization pump (150) and the storage tank (102).

Here, the cooling line (L32) is branched from the first cooling medium recovery line (L31) and connected to the front end of the gas-liquid separator 140 of the boil-off gas supply line (L11).

Next, the gas component separated by the gas-liquid separator 140 is joined to the front end of the first heat exchanger 121 of the boil-off gas supply line L11 through the gas component joining line L21, and the first heat exchanger 121 ) and then recovered to the storage tank (102).

Through this, it is possible to perform overall cooling on the devices that make up the fuel supply system 100 without having to separately provide a cool-down line.

The first control valve (V1) is provided in the above-described first cooling medium recovery line (L31), and is branched from the first cooling medium recovery line (L31) to the front end of the gas-liquid separator 140 of the boil-off gas supply line (L11). A second control valve (V2) is provided on the connected cooling line (L32).

In addition, a temperature meter 180 is provided at the rear end of the first heat exchanger 121 of the boil-off gas supply line (L11), and is branched from the rear end of the temperature meter 180 of the boil-off gas supply line (L11) to the storage tank 102. A third control valve (V3) is provided in the second cooling medium recovery line (L33) connected to.

At this time, when the cool-down operation is sufficiently performed based on the value measured by the temperature measuring device 180, the opening and closing of one or more of the first control valve (V1) to the third control valve (V3) may be controlled.

For example, when it is determined that the cool-down operation has been sufficiently performed based on the value measured by the temperature measuring device 180, the third control valve (V3) of the second cooling medium recovery line (L33) is opened to allow cool-down. The used fluid can be recovered into the storage tank 102. At this time, the above-described first control valve (V1) is opened and the second control valve (V2) is closed.

When the fuel supply system 100 is operated after performing the above-described cool-down operation, the fourth control valve V4 provided in front of the compression unit 110 of the boil-off gas supply line L11 can be opened. At this time, the first control valve (V1) to the third control valve (V3) may be in a closed state.

In this way, through an embodiment of the present invention, the efficiency of cooling work can be increased by flowing liquefied gas throughout the system during cooling work for initial startup without having a separate cool-down line.

In addition, the compressor 112 according to an embodiment of the present invention can minimize initial investment and operating costs by applying a low-pressure compressor, unlike the conventional high-pressure multi-stage compressor, and improve safety by increasing operating convenience and minimizing high-pressure hazardous areas. You can.

In addition, the liquefied gas supplied from the storage tank 102 absorbs the energy of the boil-off gas in the second heat exchanger 122 and is converted to a state suitable for the pressurization pump 150, resulting in the capacity of the first vaporizer 160. can be reduced.

Looking at the Molier Diagram (Pressure-Enthalpy Diagram) of a general boil-off gas, conventionally cooling was performed in a high pressure area above the critical point to reduce the energy consumed for liquefying the boil-off gas.

However, in the case of the fuel supply system 100 according to an embodiment of the present invention, the process of boosting the boil-off gas to high pressure is unnecessary to reduce the energy required to liquefy the boil-off gas, and liquefaction efficiency can be improved even at low pressure. there is.

In addition, when the boil-off gas liquefied by the heat exchange unit 120 is expanded by the expander 130 to the pressure of the storage tank 102, the isothermal curve slope of the Molière diagram in the liquid region is positive, so the outlet of the heat exchange unit 120 If the temperature is the same, the amount of liquefied boil-off gas may increase at low pressure.

In addition, by minimizing the use of boil-off gas, light hydrocarbon components can be effectively preserved, and the fuel components in the storage tank 102 can be maintained in good condition.

In the above, specific embodiments are shown and described. However, the present invention is not limited to the above-described embodiments, and those skilled in the art can make various changes without departing from the gist of the technical idea of the invention as set forth in the claims below. You will be able to.

102: storage tank 110: compression unit
120: heat exchanger 130: expander
140: Gas-liquid separator 150: Pressurization pump
160: first vaporizer 170: second vaporizer
L11: Evaporative gas supply line L12: First fuel supply line
L13: Second fuel supply line L14: Compressed gas supply line
L21: Gas component confluence line L22: Liquid component recovery line
L31: First cooling medium recovery line L32: Cooling line
L33: Second cooling medium recovery line

Claims (8)

A heat exchange unit including a first heat exchanger that precools the fluid compressed by the compression unit by heat exchange with the boil-off gas of the liquefied gas supplied from the storage tank, and a second heat exchanger that liquefies the precooled fluid;
a gas-liquid separator that separates gas-liquid from the fluid passing through the heat exchanger;
A boil-off gas supply line that sends the boil-off gas through the first heat exchanger to the compression unit, the first heat exchanger, the second heat exchanger, and the gas-liquid separator;
a gas component confluence line that merges the gas components separated by the gas-liquid separator into the front end of the first heat exchanger of the boil-off gas supply line;
A first fuel supply line that supplies the liquefied gas supplied from the storage tank to a first consumer through the second heat exchanger; and
A pressurizing pump provided in the first fuel supply line and compressing the fluid that has passed through the second heat exchanger according to the fuel supply conditions of the first demand source,
During the cooling operation for initial start-up, the liquefied gas supplied from the storage tank flows to the gas-liquid separator through the second heat exchanger and the pressurization pump, and the gas component separated by the gas-liquid separator passes through the first heat exchanger to the gas-liquid separator. A marine fuel supply system that is returned to a storage tank. According to paragraph 1,
A first cooling medium recovery line connecting the pressurization pump and the storage tank and equipped with a first control valve;
A second control valve is provided, and a cooling line branches off from the first cooling medium recovery line and connected to the front end of the gas-liquid separator of the boil-off gas supply line,
During the cooling operation for the initial start, the liquefied gas supplied from the storage tank passes through the second heat exchanger and the pressurization pump through the first fuel supply line and then flows toward the gas-liquid separator through the cooling line to supply marine fuel. system. According to paragraph 2,
A temperature measuring device provided at the rear of the first heat exchanger of the boil-off gas supply line,
A second cooling medium recovery line branched from the rear end of the first heat exchanger of the boil-off gas supply line and connected to the storage tank,
It further includes a third control valve provided in the second cooling medium recovery line,
A marine fuel supply system in which the opening and closing of one or more of the first control valve to the third control valve is controlled based on the value measured by the temperature measuring device. According to paragraph 1,
a first vaporizer that vaporizes the fluid compressed by the pressurization pump according to the fuel supply conditions of the first demand source;
A second fuel supply line branched from the rear end of the second heat exchanger of the first fuel supply line and connected to a second demand source requiring low-pressure fuel,
A marine fuel supply system provided in the second fuel supply line and further comprising a second vaporizer that vaporizes the fluid that has passed through the heat exchanger according to the fuel supply conditions of the second consumer. According to paragraph 4,
A marine vessel further comprising a compressed gas supply line branched between the compression unit and the heat exchange unit and connected to a rear end of the second vaporizer of the second fuel supply line, and supplying the fluid passing through the compression unit to the second demand source. Fuel supply system. According to paragraph 4,
The compression section
A preheater that heats the fluid,
a low-pressure compressor that compresses the fluid heated by the preheater to a low pressure in accordance with the fuel supply conditions of the second consumer;
A marine fuel supply system including a cooler that cools the compressed fluid. According to paragraph 1,
A marine fuel supply system provided between the heat exchange part of the boil-off gas supply line and the gas-liquid separator, further comprising an expander that expands the fluid passing through the heat exchange part. A liquefied gas fuel propulsion vessel equipped with a fuel supply system according to any one of paragraphs 1 to 7.

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