Gas treatment system and ship including same

Abstract

The present invention relates to a gas treatment system and a ship including same. The gas treatment system comprises: a fuel storage tank which stores liquefied gas; a fuel supply unit which pressurizes and vaporizes the liquefied gas of the fuel storage tank to supply the liquefied gas in a gaseous state to a demand source; and a fuel discharge unit which discharges remaining gas of the fuel supply unit when the demand source is not consuming the liquefied gas, and the fuel discharge unit comprises: a fuel recovery line through which the gas discharged from the fuel supply unit is transferred to the fuel storage tank; a fuel discharge line which is branched from the fuel recovery line so as to be connected to an atmospheric discharge device; and a control unit which controls gas flow of the fuel recovery line and the fuel discharge line in accordance with internal pressure of the fuel storage tank.

Description

Gas processing system and ship including the same

[0001] The present invention relates to a gas processing system and a vessel including the same.

[0002] In response to the recent tightening of environmental regulations by the International Maritime Organization (IMO) and demands to reduce greenhouse gas emissions, the application of LNG vessels using liquefied natural gas (LNG) as fuel for ship propulsion and operation is expanding. LNG is considered an eco-friendly fuel because it emits relatively lower amounts of sulfur oxides, nitrogen oxides, and carbon dioxide compared to conventional heavy fuel oil; consequently, the construction and operation of LNG-fueled vessels are continuously increasing.

[0003] Such LNG vessels are equipped with an LNG fuel supply system to stably supply fuel from an LNG storage tank to an engine or boiler. The fuel supply system includes a storage tank, pump, evaporator, valve, piping, and control device, and is configured to supply liquefied LNG to a combustion device by adjusting it to the required pressure and temperature. In particular, in the event of a shutdown, inspection, or abnormal situation, it is necessary to properly treat residual gas within the piping and equipment to ensure internal pressure control and safety.

[0004] In conventional LNG fuel supply systems, the primary method used to treat the residual gas has been to discharge it directly into the atmosphere through piping or vent lines. However, this method of discharge into the atmosphere can cause greenhouse gas emissions due to the release of gases, including methane, and raises concerns regarding environmental pollution around the vessel and reduced safety. Furthermore, as there are limitations in meeting increasingly stringent environmental regulations and emission standards, there is a continuous demand for technologies that can treat residual gas in a more eco-friendly and efficient manner.

[0005] The present invention aims to provide a gas treatment system and a vessel including the same, which can treat residual gas more environmentally and efficiently by recovering residual gas from a fuel supply unit through a fuel recovery line in a vessel using liquefied gas as fuel.

[0006] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0007] A gas treatment system according to one aspect of the present invention comprises a fuel storage tank for storing liquefied gas, a fuel supply unit for pressurizing and vaporizing the liquefied gas of the fuel storage tank and supplying it to a demand location in a gaseous state, and a fuel discharge unit for discharging residual gas from the fuel supply unit when the demand location is in a state where it cannot consume the liquefied gas. The fuel discharge unit comprises a fuel recovery line for delivering gas discharged from the fuel supply unit to the fuel storage tank, a fuel discharge line branched from the fuel recovery line and connected to an atmospheric discharge device, and a control unit for controlling the gas flow of the fuel recovery line and the fuel discharge line according to the internal pressure of the fuel storage tank.

[0008] Specifically, the control unit may allow the residual gas of the fuel supply unit to be transferred to the fuel storage tank through the fuel recovery line when the operation of the demand source is stopped, and may allow the residual gas of the fuel supply unit to be transferred to the atmospheric discharge device through the fuel discharge line when the inside of the fuel storage tank is in an overpressure state.

[0009] Specifically, the fuel supply unit includes a fuel supply line connected to the demand source and a gas valve unit provided on the fuel supply line that delivers liquefied gas, with its temperature and pressure controlled according to the requirements of the demand source, to the demand source, and the fuel recovery line may be connected to the gas valve unit or branched off upstream of the gas valve unit.

[0010] Specifically, the fuel recovery line includes a first recovery valve provided on the fuel supply line side and a second recovery valve provided on the fuel storage tank side, and the fuel discharge line includes a discharge valve and can be branched between the first recovery valve and the second recovery valve.

[0011] Specifically, the control unit may open the first recovery valve and the second recovery valve and close the discharge valve when the operation of the demand source is interrupted, and close the second recovery valve and open the discharge valve when the inside of the fuel storage tank is in an overpressure state.

[0012] Specifically, the above demand source includes a main engine, a first power generation engine, a second power generation engine, and a boiler, and the fuel supply line may include a first supply line connected to the main engine, a second supply line connected to the first power generation engine, a third supply line connected to the second power generation engine, and a fourth supply line connected to the boiler.

[0013] Specifically, the fuel recovery line is connected to the first supply line, the second supply line, the third supply line, and the fourth supply line, respectively, and the first recovery valve may include a first-1 recovery valve provided on the side of the first supply line, a first-2 recovery valve provided on the side of the second supply line, a first-3 recovery valve provided on the side of the third supply line, and a first-4 recovery valve provided on the side of the fourth supply line.

[0014] Specifically, the fuel supply unit includes a gas valve unit that delivers liquefied gas, with its temperature and pressure controlled according to the requirements of the demand location, to the demand location, and the fuel recovery line delivers the gas remaining in the fuel supply unit to the fuel storage tank through the gas valve unit, recovering the gas for a first section between the fuel storage tank and the gas valve unit, and also recovering the gas for a second section between the gas valve unit and the demand location through the gas valve unit, and when the operation of the demand location is stopped, the gas for the first section and the gas for the second section can be recovered and delivered to the fuel storage tank.

[0015] Specifically, the fuel supply unit further includes a fuel supply line connected to the demand source, and the fuel supply line may include the first section upstream of the gas valve unit and the second section downstream of the gas valve unit.

[0016] Specifically, the gas valve unit is opened to both the first section and the second section when the operation of the demand source is stopped, and the fuel recovery line is provided with an oil filter on the side of the gas valve unit, and recovers the residual gas inside the first section and the residual gas inside the second section of the fuel supply line together through the gas valve unit, while filtering the oil flowing in together with the gas through the oil filter.

[0017] Specifically, the system further includes a liquefaction unit that liquefies the evaporated gas of the fuel storage tank into the liquefied gas of the fuel supply unit, wherein the fuel supply unit includes a recondenser that mixes the evaporated gas with the liquefied gas, a first pump provided downstream of the recondenser that pressurizes the liquefied gas, and a separator provided between the recondenser and the first pump that separates gas and liquid, and the fuel recovery line delivers the gas discharged from the fuel supply unit to the separator, and the liquefaction unit may include a compressor that compresses the evaporated gas generated in the fuel storage tank and a cooler that cools the evaporated gas compressed by the compressor.

[0018] Specifically, the separator mixes the gas discharged from the fuel supply unit with the liquefied gas or evaporated gas delivered from the recondenser and separates the gas and liquid, delivers the separated liquefied gas to the first pump, and the liquefied gas separated through the separator can be supplied to the demand source by sequentially passing through the first pump and the cooler.

[0019] A vessel according to one aspect of the present invention comprises a cargo area provided in the hull for loading cargo and a gas processing system, wherein the fuel supply unit is provided adjacent to a demand source that propels the hull and comprises a gas valve unit that delivers liquefied gas, with its temperature and pressure controlled according to the requirements of the demand source, to the demand source and a fuel supply line connected to the demand source, wherein the fuel discharge unit further comprises a fuel recovery tank provided to be unloadable in the cargo area adjacent to the gas valve unit, and the fuel recovery line delivers gas discharged from the fuel supply unit to the fuel recovery tank, wherein the fuel recovery line is connected to the gas valve unit or branches off upstream of the gas valve unit and recovers gas from the fuel supply line and delivers it to the fuel recovery tank when the operation of the demand source is stopped.

[0020] Specifically, the system further includes an engine room provided at the stern of the hull and accommodating the demand source, and an engine casing provided at the stern of the hull and positioned above the engine room to discharge exhaust from the demand source, and the fuel recovery tank may be provided at a location adjacent to the engine room and the engine casing.

[0021] Specifically, the apparatus further includes a gas valve unit room that accommodates the gas valve unit and is provided inside the engine room at the lower side of the engine casing or outside the engine room at one side of the engine casing, and the fuel recovery tank may be provided at the rear of the gas valve unit room.

[0022] The gas treatment system according to the present invention and the vessel including the same can treat the residual gas more environmentally friendly and efficiently by recovering the residual gas from the fuel supply unit through a fuel recovery line in a vessel that uses liquefied gas as fuel.

[0023] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0024] FIG. 1 is a drawing showing a gas treatment system according to a first embodiment of the present invention.

[0025] FIG. 2 is a drawing showing a gas treatment system according to a second embodiment of the present invention.

[0026] FIG. 3 is a diagram illustrating the movement of residual gas in a gas treatment system according to a second embodiment of the present invention.

[0027] FIG. 4 is a drawing showing a gas treatment system according to a third embodiment of the present invention.

[0028] FIG. 5 is a drawing showing a gas treatment system and a vessel according to the fourth embodiment of the present invention.

[0029] FIG. 6 is a drawing for explaining the arrangement of fuel recovery tanks in a ship according to the fourth embodiment of the present invention.

[0030] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that in assigning reference numerals to the components of each drawing in this specification, identical components are assigned the same number whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention.

[0031] In addition, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included.

[0032] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0033] In addition, it should be noted that terms indicating directionality such as forward, backward, left, right, longitudinal, and transverse are defined based on a ship consisting of a bow, stern, sides (port and starboard), upper deck, and bottom.

[0034] Furthermore, it should be noted that in this specification, the term "ship" encompasses not only merchant vessels that transport cargo from a place of origin to a destination, but also offshore structures that float at a certain point on the sea and perform specific tasks.

[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0036] In the following, with reference to FIG. 1, a gas treatment system (10) according to a first embodiment of the present invention and a vessel including the same will be described.

[0037] For reference, the gas treatment system according to the first embodiment of the present invention of FIG. 1 may correspond to or be connected to at least a part of the components included in other embodiments of the present invention.

[0038] In addition, the fuel used in the vessel according to the first embodiment of the present invention may be a liquefied gas such as LNG, but is not limited thereto; however, for convenience, the fuel is selected as LNG as the liquefied gas for the following description.

[0039] FIG. 1 is a drawing showing a gas treatment system according to a first embodiment of the present invention.

[0040] Referring to FIG. 1, a gas treatment system (10) according to a first embodiment of the present invention includes a fuel storage tank (100), a fuel supply unit, and a fuel discharge unit.

[0041] The fuel storage tank (100) can store liquefied gas.

[0042] A pressure measuring sensor (105) for measuring internal pressure may be provided in the fuel storage tank (100).

[0043] For example, the fuel storage tank (100) may be configured to store LNG in a liquid state at cryogenic temperatures and may suppress the generation of evaporative gases by including an insulating structure to minimize the inflow of external heat. Additionally, the fuel storage tank (100) may be formed as a single tank or a multiple tank structure depending on the storage capacity, pressure conditions, and installation environment.

[0044] The fuel supply unit can pressurize and vaporize the liquefied gas of the fuel storage tank (100) and supply it to the demand location (110) in a gaseous state.

[0045] The fuel supply unit may include a fuel gas supply system (201).

[0046] For example, the fuel supply unit may include a pump, a vaporizer, and a valve, and can stably supply fuel in response to the required flow rate and pressure conditions of the demand location (110) by pressurizing LNG to a set pressure, converting it into gaseous gas through heat exchange, and delivering it to the demand location (110) through a supply line.

[0047] The fuel discharge unit can discharge the remaining gas from the fuel supply unit when the demand location (110) is in a state where it cannot consume the liquefied gas.

[0048] The fuel discharge section may include a fuel recovery line (L30), a fuel discharge line (L35), and a control section (303).

[0049] The fuel recovery line (L30) can transfer the gas discharged from the fuel supply unit to the fuel storage tank (100).

[0050] The fuel discharge line (L35) can be branched from the fuel recovery line (L30) and connected to the atmospheric discharge device (301).

[0051] The control unit (303) can control the gas flow of the fuel recovery line (L30) and the fuel discharge line (L35) according to the internal pressure of the fuel storage tank (100).

[0052] The control unit (303) can allow the remaining gas of the fuel supply unit to be transferred to the fuel storage tank (100) through the fuel recovery line (L30) when the operation of the demand source (110) is stopped.

[0053] The control unit (303) can allow residual gas from the fuel supply unit to be transferred to the atmospheric discharge device (301) through the fuel discharge line (L35) when the inside of the fuel storage tank (100) is in an overpressure state.

[0054] That is, the control unit (303) recovers the remaining gas in the fuel supply unit through the fuel recovery line (L30) in the event of interruption or emergency stop of the demand source (110), but can discharge the remaining gas into the atmosphere through the fuel discharge line (L35) when the internal pressure of the fuel storage tank (100) rises excessively.

[0055] The fuel supply unit may include a fuel supply line (L20) and a gas valve unit (210).

[0056] The fuel supply line (L20) can be connected to the fuel gas supply system (201) and the demand source (110).

[0057] The gas valve unit (210) is provided on the fuel supply line (L20) and can deliver liquefied gas with controlled temperature and pressure to the demand location (110) according to the requirements of the demand location (110).

[0058] The fuel recovery line (L30) may be connected to the gas valve unit (210) or branched off upstream of the gas valve unit (210).

[0059] The fuel recovery line (L30) may include a first recovery valve (310) and a second recovery valve (320).

[0060] The first recovery valve (310) can be provided on the fuel supply line (L20) side.

[0061] The second recovery valve (320) can be provided on the fuel storage tank (100) side.

[0062] The fuel discharge line (L35) may include a discharge valve (330).

[0063] The fuel discharge line (L35) can be branched between the first recovery valve (310) and the second recovery valve (320).

[0064] The control unit (303) can open the first recovery valve (310) and the second recovery valve (320) and close the discharge valve (330) when the operation of the demand source (110) is interrupted.

[0065] The control unit (303) can close the second recovery valve (320) and open the discharge valve (330) when the inside of the fuel storage tank (100) is in an overpressure state.

[0066] That is, when recovery of residual gas from the fuel supply unit is required, the control unit (303) controls the first recovery valve (310), the second recovery valve (320), and the discharge valve (330) so that the residual gas is recovered to the fuel storage tank (100) through the fuel recovery line (L30) or discharged to the atmosphere through the fuel discharge line (L35).

[0067] The demand source (110) may include a main engine (111), a first power generation engine (113), a second power generation engine (115), and a boiler (117).

[0068] For example, the main engine (111) is a primary power source that generates propulsion for the vessel (1) and can be configured to use LNG as fuel to improve combustion efficiency and reduce exhaust gas. In this case, the main engine (111) may require a relatively large amount of fuel supply depending on the operating load.

[0069] For example, the first power generation engine (113) is a power source responsible for supplying power to the ship (1) or facility, and may be configured to produce electricity using LNG fuel and may be selectively operated in response to power demand while sailing or anchored.

[0070] For example, the second power generation engine (115) may be provided in parallel with or as a backup configuration with the first power generation engine (113), and may be driven independently using LNG as fuel to respond to power load distribution or emergency operation.

[0071] For example, the boiler (117) may be configured to provide a heat source for heating, supplying hot water, or heating auxiliary equipment within the vessel (1), and may generate the necessary thermal energy by burning LNG or vaporized natural gas as fuel.

[0072] The fuel supply line (L20) may include a first supply line (L21), a second supply line (L22), a third supply line (L23), and a fourth supply line (L24).

[0073] The first supply line (L21) can be connected to the main engine (111).

[0074] The second supply line (L22) can be connected to the first power generation engine (113).

[0075] The third supply line (L23) can be connected to the second power generation engine (115).

[0076] The fourth supply line (L24) can be connected to the boiler (117).

[0077] The fuel recovery line (L30) can be connected to the first supply line (L21), the second supply line (L22), the third supply line (L23), and the fourth supply line (L24), respectively.

[0078] The first recovery line (L31) may include a first-1 recovery valve (311), a first-2 recovery valve (312), a first-3 recovery valve (313), and a first-4 recovery valve (314).

[0079] The first-1 recovery valve (311) can be provided on the first supply line (L21) side.

[0080] The first-second recovery valve (312) can be provided on the second supply line (L22) side.

[0081] The first-third recovery valve (313) can be provided on the third supply line (L23) side.

[0082] The first-fourth recovery valve (314) can be provided on the side of the fourth supply line (L24).

[0083] The fuel recovery line (L30) may include a first recovery line (L31), a second recovery line (L32), a third recovery line (L33), and a fourth recovery line (L34).

[0084] The first recovery line (L31) is connected to the first supply line (L21), and a first-1 recovery valve (311) may be provided.

[0085] The second recovery line (L32) is connected to the second supply line (L22), and a first-second recovery valve (312) may be provided.

[0086] The third recovery line (L33) is connected to the third supply line (L23), and a first-third recovery valve (313) may be provided.

[0087] The fourth recovery line (L34) is connected to the fourth supply line (L24), and a first-to-fourth recovery valve (314) may be provided.

[0088] The gas valve unit (210) may include a first valve unit (211), a second valve unit (212), a third valve unit (213), and a fourth valve unit (214).

[0089] For example, the first valve unit (211) can be provided as a gas valve train.

[0090] The first recovery line (L31) can be connected to the first valve unit (211).

[0091] The second recovery line (L32) can be branched off from the upstream side of the second valve unit (212).

[0092] The third recovery line (L33) can be branched off from the upstream side of the third valve unit (213).

[0093] The fourth recovery line (L34) can be branched off from the upstream side of the fourth valve unit (214).

[0094] The first recovery line (L31), the second recovery line (L32), the third recovery line (L33), and the fourth recovery line (L34) can be joined upstream of the branching point where the fuel discharge line (L35) branches off.

[0095] A first pressure sensor (321) for measuring pressure within the line may be provided in the fuel recovery line (L30).

[0096] The first pressure sensor (321) may be provided downstream of the first-1 recovery valve (311) on the first recovery line (L31).

[0097] A vessel (1) according to the first embodiment of the present invention includes a gas treatment system (10) according to the first embodiment of the present invention.

[0098] In the following, with reference to FIGS. 2 and FIGS. 3, a gas treatment system (10) according to a second embodiment of the present invention and a vessel (1) including the same will be described.

[0099] For reference, the gas treatment system (10) according to the second embodiment of the present invention of FIGS. 2 and FIGS. 3 may correspond to or be connected to at least a part of the components included in other embodiments of the present invention.

[0100] In addition, the fuel used in the vessel (1) according to the second embodiment of the present invention may be a liquefied gas such as LNG, but is not limited thereto; however, for convenience, the fuel is selected as LNG as the liquefied gas for the following description.

[0101] FIG. 2 is a drawing showing a gas treatment system (10) according to a second embodiment of the present invention. FIG. 3 is a drawing for explaining the movement of residual gas in a gas treatment system (10) according to a second embodiment of the present invention.

[0102] Referring to FIGS. 2 and FIGS. 3, a gas treatment system (10) according to a second embodiment of the present invention includes a fuel storage tank (100), a fuel supply unit, and a fuel discharge unit.

[0103] The fuel storage tank (100) can store liquefied gas.

[0104] For example, the fuel storage tank (100) may be configured to store LNG in a liquid state at cryogenic temperatures and may suppress the generation of evaporative gases by including an insulating structure to minimize the inflow of external heat. Additionally, the fuel storage tank (100) may be formed as a single tank or a multiple tank structure depending on the storage capacity, pressure conditions, and installation environment.

[0105] The fuel supply unit can pressurize and vaporize the liquefied gas of the fuel storage tank (100) and supply it to the demand location (110) in a gaseous state.

[0106] The fuel supply unit may include a fuel gas supply system (201).

[0107] For example, the fuel supply unit may include a pump, a vaporizer, and a valve, and can stably supply fuel in response to the required flow rate and pressure conditions of the demand location (110) by pressurizing LNG to a set pressure, converting it into gaseous gas through heat exchange, and delivering it to the demand location (110) through a supply line.

[0108] The fuel discharge unit can discharge the remaining gas from the fuel supply unit when the demand location (110) is in a state where it cannot consume the liquefied gas.

[0109] The fuel supply unit may include a gas valve unit (210).

[0110] The gas valve unit (210) can deliver liquefied gas with controlled temperature and pressure to the demand location (110) according to the requirements of the demand location (110).

[0111] The fuel discharge section may include a fuel recovery line (L30).

[0112] The fuel recovery line (L30) can transfer the gas remaining in the fuel supply unit to the fuel storage tank (100) through the gas valve unit (210).

[0113] The fuel recovery line (L30) can recover gas for the first section between the fuel storage tank (100) and the gas valve unit (210).

[0114] For example, the first section may be the section between the fuel gas supply system (201) and the gas valve unit (210).

[0115] The fuel recovery line (L30) can recover gas for the second section between the gas valve unit (210) and the demand location (110) through the gas valve unit (210).

[0116] That is, the fuel recovery line (L30) recovers the remaining gas from the fuel supply unit through the gas valve unit (210) when the operation of the demand source (110) is stopped, and can recover the gas for the first section and the second section corresponding to both sides of the gas valve unit (210) together.

[0117] The fuel recovery line (L30) can recover gas from the first section and gas from the second section and transfer them to the fuel storage tank (100) when the operation of the demand source (110) is stopped.

[0118] The fuel supply unit may further include a fuel supply line (L20) connected to a demand source (110).

[0119] The fuel supply line (L20) can be connected to the fuel gas supply system (201) and the demand source (110).

[0120] The fuel supply line (L20) may include a first section upstream of the gas valve unit (210) and a second section downstream of the gas valve unit (210).

[0121] The gas valve unit (210) can be opened to both the first section and the second section when the operation of the demand source (110) is stopped.

[0122] The fuel recovery line (L30) may be provided with an oil filter (301, 302, 303) on the side of the gas valve unit (210).

[0123] The fuel recovery line (L30) can recover residual gas inside the first section and residual gas inside the second section of the fuel supply line (L20) together through the gas valve unit (210).

[0124] The fuel recovery line (L30) can filter oil that flows in with gas through the oil filters (301, 302, 303).

[0125] The demand source (110) may include a main engine (111), a power generation engine (113), and a boiler (117).

[0126] For example, the main engine (111) is a primary power source that generates propulsion for the vessel (1) and can be configured to use LNG as fuel to improve combustion efficiency and reduce exhaust gas. In this case, the main engine (111) may require a relatively large amount of fuel supply depending on the operating load.

[0127] For example, the power generation engine (113) is a power source responsible for supplying power to the ship (1) or facility, and can be configured to produce electricity using LNG fuel and can be selectively operated in response to power demand while sailing or anchored.

[0128] For example, the boiler (117) may be configured to provide a heat source for heating, supplying hot water, or heating auxiliary equipment within the vessel (1), and may generate the necessary thermal energy by burning LNG or vaporized natural gas as fuel.

[0129] The fuel supply line (L20) may include a first supply line (L21), a second supply line (L22), and a third supply line (L23).

[0130] The first supply line (L21) can be connected to the main engine (111).

[0131] The second supply line (L22) can be connected to the power generation engine (113).

[0132] The third supply line (L23) can be connected to the boiler (117).

[0133] The fuel recovery line (L30) can be connected to the first supply line (L21), the second supply line (L22), and the third supply line (L23), respectively.

[0134] The fuel recovery line (L30) may include a first recovery line (L31), a second recovery line (L32), and a third recovery line (L33).

[0135] The gas valve unit (210) may include a first valve unit (211), a second valve unit (212), and a third valve unit (213).

[0136] For example, the first valve unit (211) can be provided as a gas valve train.

[0137] The first recovery line (L31) can be connected to the first valve unit (211).

[0138] The second recovery line (L32) can be connected to the second valve unit (212).

[0139] The third recovery line (L33) can be connected to the third valve unit (213).

[0140] The first recovery line (L31) is connected to the first supply line (L21) through the first valve unit (211), and a first recovery valve (311) may be provided.

[0141] The second recovery line (L32) is connected to the second supply line (L22) through the second valve unit (212), and a second recovery valve (312) may be provided.

[0142] The third recovery line (L33) is connected to the third supply line (L23) through the third valve unit (213), and a third recovery valve (313) may be provided.

[0143] The first recovery valve (311) can have its opening controlled according to the pressure of the first recovery line (L31).

[0144] Downstream of the first recovery valve (311), a first pressure sensor (321) for measuring the pressure of the first recovery line (L31) may be provided.

[0145] The second recovery valve (312) can have its opening controlled according to the pressure of the second recovery line (L32).

[0146] Downstream of the second recovery valve (312), a second pressure sensor (322) for measuring the pressure of the second recovery line (L32) may be provided.

[0147] The third recovery valve (313) can have its opening controlled according to the pressure of the third recovery line (L33).

[0148] Downstream of the third recovery valve (313), a third pressure sensor (323) for measuring the pressure of the third recovery line (L33) may be provided.

[0149] The oil filters (301, 302, 303) may include a first oil filter (301), a second oil filter (302), and a third oil filter (303).

[0150] The first oil filter (301) can be provided upstream of the first recovery valve (311) in the first recovery line (L31).

[0151] The second oil filter (302) can be provided upstream of the second recovery valve (312) in the second recovery line (L32).

[0152] The third oil filter (303) can be provided upstream of the third recovery valve (313) in the third recovery line (L33).

[0153] The first recovery line (L31), the second recovery line (L32), and the third recovery line (L33) can be joined downstream and connected to the fuel storage tank (100).

[0154] A vessel (1) according to the second embodiment of the present invention includes a gas treatment system (10) according to the second embodiment of the present invention.

[0155] In the following description, with reference to FIG. 4, a gas treatment system (10) according to a third embodiment of the present invention and a vessel (1) including the same will be described.

[0156] For reference, the gas treatment system (10) according to the third embodiment of the present invention of FIG. 4 may correspond to or be connected to at least a part of the components included in other embodiments of the present invention.

[0157] In addition, the fuel used in the vessel (1) according to the third embodiment of the present invention may be a liquefied gas such as LNG, but is not limited thereto; however, for convenience, the fuel is selected as LNG as the liquefied gas for the following description.

[0158] FIG. 4 is a drawing showing a gas treatment system (10) according to a third embodiment of the present invention.

[0159] Referring to FIG. 4, a gas treatment system (10) according to the third embodiment of the present invention includes a fuel storage tank (100), a fuel supply unit, a liquefaction unit, and a fuel discharge unit.

[0160] The fuel storage tank (100) can store liquefied gas.

[0161] For example, the fuel storage tank (100) may be configured to store LNG in a liquid state at cryogenic temperatures and may suppress the generation of evaporative gases by including an insulating structure to minimize the inflow of external heat. Additionally, the fuel storage tank (100) may be formed as a single tank or a multiple tank structure depending on the storage capacity, pressure conditions, and installation environment.

[0162] The fuel supply unit can pressurize and vaporize the liquefied gas of the fuel storage tank (100) and supply it to the demand location (110) in a gaseous state.

[0163] The fuel supply unit may include a fuel gas supply system (201).

[0164] For example, the fuel supply unit may include a pump, a vaporizer, and a valve, and can stably supply fuel in response to the required flow rate and pressure conditions of the demand location (110) by pressurizing LNG to a set pressure, converting it into gaseous gas through heat exchange, and delivering it to the demand location (110) through a supply line.

[0165] The liquefaction unit can liquefy the evaporated gas of the fuel storage tank (100) into the liquefied gas of the fuel supply unit.

[0166] For example, the liquefaction unit may be configured to convert the LNG boil-off gas (BOG) generated within the fuel storage tank (100) back into a liquid state through a re-cooling or compression-cooling process, and by resupplying the liquefied fuel to the fuel supply unit, fuel loss can be reduced and pressure rise within the storage tank can be suppressed.

[0167] The fuel discharge unit can discharge the remaining gas from the fuel supply unit when the demand location (110) is in a state where it cannot consume the liquefied gas.

[0168] The fuel supply unit may include a recondenser (202), a first pump (204), and a separator (203).

[0169] For example, the fuel supply unit may include a pretreatment configuration for supplying to a demand location (110) while maintaining the state of LNG stably, and may be configured to perform the recycling of evaporated gas and the pressurization of liquefied gas in stages.

[0170] The recondenser (202) can mix evaporated gas with liquefied gas.

[0171] For example, the recondenser (202) can be configured to re-condense the LNG boil-off gas generated in the fuel storage tank (100), etc., by bringing it into contact with a relatively low-temperature liquefied gas, thereby recovering the boil-off gas as liquefied gas and reducing fuel loss.

[0172] The first pump (204) is provided downstream of the recondenser (202) and can pressurize the liquefied gas.

[0173] For example, the first pump (204) can be configured to pressurize the liquefied LNG stabilized through the recondenser (202) to a set pressure and transfer it to the fuel supply line (L20), thereby enabling continuous fuel supply in response to the required pressure conditions of the demand location (110).

[0174] The separator (203) is provided between the recondenser (202) and the first pump (204) to separate gas and liquid.

[0175] For example, the separator (203) may be configured to separate the remaining gaseous components from the LNG mixed in the recondenser (202) and the evaporated gas, thereby allowing only the liquid components to flow into the first pump (204), which can suppress pump cavitation and improve pressurization efficiency.

[0176] The fuel discharge section may include a fuel recovery line (L30).

[0177] The fuel recovery line (L30) can transfer the gas discharged from the fuel supply unit to the separator (203).

[0178] That is, the fuel recovery line (L30) can recover the residual gas from the fuel supply unit and transfer it to the separator (203) so that it is processed together with the gas in the fuel storage tank (100).

[0179] The liquefaction unit may include a compressor (401) that compresses evaporative gas generated in a fuel storage tank (100) and a cooler (402) that cools the evaporative gas compressed by the compressor (401).

[0180] For example, the compressor (401) may be configured to compress the LNG boil-off gas generated in the fuel storage tank (100) to a set pressure to make it suitable for a downstream liquefaction process.

[0181] For example, the cooler (402) is configured to remove heat by cooling the evaporated gas whose temperature has risen during the compression process so that condensation is possible, and can perform a pretreatment role for regenerating the evaporated gas into liquefied gas or supplying it to the recondenser (202).

[0182] The separator (203) can separate the gas and liquid after mixing the gas discharged from the fuel supply unit with the liquefied gas or evaporated gas delivered from the recondenser (202).

[0183] The separator (203) can transfer the separated liquefied gas to the first pump (204).

[0184] The liquefied gas separated through the separator (203) can be supplied to the demand source (110) by sequentially passing through the first pump (204) and the cooler (402).

[0185] For example, the first pump (204) may be configured as a High Pressure Pump (HPP) to pressurize the liquefied gas separated from the separator (203) to a high pressure. The first pump (204) increases only the pressure while maintaining the liquid state of the liquefied gas without vaporizing it, thereby creating conditions suitable for generating high-pressure gaseous fuel in the subsequent vaporization process.

[0186] For example, a cooler (402) is provided downstream of the first pump (204) and may be configured to regulate the temperature of the pressurized liquefied gas. The cooler (402) may mitigate temperature changes caused by external heat inflow or pump operation so that the liquefied gas is delivered to the downstream vaporization device while maintaining a stable liquid state.

[0187] The fuel supply unit may further include a gas valve unit (210) and a fuel supply line (L20).

[0188] The gas valve unit (210) can deliver liquefied gas with controlled temperature and pressure to the demand location (110) according to the requirements of the demand location (110).

[0189] The fuel supply line (L20) can be connected to the fuel gas supply system (201) and the demand source (110).

[0190] The fuel recovery line (L30) can recover gas from the fuel supply line (L20) through the gas valve unit (210) and transfer it to the separator (203) when the operation of the demand source (110) is stopped.

[0191] The fuel recovery line (L30) is provided with an oil filter (301, 302, 303) on the side of the gas valve unit (210), and can recover residual gas inside the fuel supply line (L20) together through the gas valve unit (210).

[0192] The fuel recovery line (L30) can filter oil that flows in with gas through the oil filters (301, 302, 303).

[0193] The demand source (110) may include a main engine (111), a power generation engine (113), and a boiler (117).

[0194] For example, the main engine (111) is a primary power source that generates propulsion for the vessel (1) and can be configured to use LNG as fuel to improve combustion efficiency and reduce exhaust gas. In this case, the main engine (111) may require a relatively large amount of fuel supply depending on the operating load.

[0195] For example, the power generation engine (113) is a power source responsible for supplying power to the ship (1) or facility, and can be configured to produce electricity using LNG fuel and can be selectively operated in response to power demand while sailing or anchored.

[0196] For example, the boiler (117) may be configured to provide a heat source for heating, supplying hot water, or heating auxiliary equipment within the vessel (1), and may generate the necessary thermal energy by burning LNG or vaporized natural gas as fuel.

[0197] The fuel supply line (L20) may include a first supply line (L21), a second supply line (L22), and a third supply line (L23).

[0198] The first supply line (L21) can be connected to the main engine (111).

[0199] The second supply line (L22) can be connected to the power generation engine (113).

[0200] The third supply line (L23) can be connected to the boiler (117).

[0201] The fuel recovery line (L30) can be connected to the first supply line (L21), the second supply line (L22), and the third supply line (L23), respectively.

[0202] The fuel recovery line (L30) may include a first recovery line (L31), a second recovery line (L32), and a third recovery line (L33).

[0203] The gas valve unit (210) may include a first valve unit (211), a second valve unit (212), and a third valve unit (213).

[0204] For example, the first valve unit (211) can be provided as a gas valve train.

[0205] The first recovery line (L31) can be connected to the first valve unit (211).

[0206] The second recovery line (L32) can be connected to the second valve unit (212).

[0207] The third recovery line (L33) can be connected to the third valve unit (213).

[0208] The first recovery line (L31) is connected to the first supply line (L21) through the first valve unit (211), and a first recovery valve (311) may be provided.

[0209] The second recovery line (L32) is connected to the second supply line (L22) through the second valve unit (212), and a second recovery valve (312) may be provided.

[0210] The third recovery line (L33) is connected to the third supply line (L23) through the third valve unit (213), and a third recovery valve (313) may be provided.

[0211] The first recovery valve (311) can have its opening controlled according to the pressure of the first recovery line (L31).

[0212] Downstream of the first recovery valve (311), a first pressure sensor (321) for measuring the pressure of the first recovery line (L31) may be provided.

[0213] The second recovery valve (312) can have its opening controlled according to the pressure of the second recovery line (L32).

[0214] Downstream of the second recovery valve (312), a second pressure sensor (322) for measuring the pressure of the second recovery line (L32) may be provided.

[0215] The third recovery valve (313) can have its opening controlled according to the pressure of the third recovery line (L33).

[0216] Downstream of the third recovery valve (313), a third pressure sensor (323) for measuring the pressure of the third recovery line (L33) may be provided.

[0217] The oil filters (301, 302, 303) may include a first oil filter (301), a second oil filter (302), and a third oil filter (303).

[0218] The first oil filter (301) can be provided upstream of the first recovery valve (311) in the first recovery line (L31).

[0219] The second oil filter (302) can be provided upstream of the second recovery valve (312) in the second recovery line (L32).

[0220] The third oil filter (303) can be provided upstream of the third recovery valve (313) in the third recovery line (L33).

[0221] The first recovery line (L31), the second recovery line (L32), and the third recovery line (L33) can be joined downstream and connected to the fuel storage tank (100).

[0222] The fuel supply unit may further include a second pump (205), a first pressure valve (206), and a second pressure valve (207).

[0223] For example, the fuel supply unit may selectively configure a high-pressure fuel supply system and a low-pressure fuel supply system, and may be configured to perform the transfer, pressurization, and pressure control of liquefied gas corresponding to each system.

[0224] For example, the second pump (205) may be a Low Pressure Pump (LSP) provided in the fuel storage tank (100).

[0225] For example, the second pump (205) may be configured to transport the liquefied gas in the fuel storage tank (100) at a relatively low pressure, and may transmit the liquefied gas to the upstream end of the fuel supply system while maintaining a liquid state without vaporizing it, thereby forming supply conditions suitable for pressure control or vaporization processes at the downstream end.

[0226] For example, the first pressure valve (206) may be a High Pressure Valve (HPV).

[0227] For example, the first pressure valve (206) is provided in a high-pressure system and can be configured to convert liquefied gas pressurized by HPP into high-pressure gaseous fuel while vaporizing it, and to regulate or cut off the pressure of the gaseous fuel, thereby stably controlling the fuel supply to a demand source (110) that requires high-pressure fuel, such as a main engine (111).

[0228] For example, the second pressure valve (207) may be a Low Pressure Valve (LPV).

[0229] For example, the second pressure valve (207) may be configured to be provided in a low-pressure system to vaporize liquefied gas and convert it into low-pressure gaseous fuel, and to adjust the pressure of the gaseous fuel to a low-pressure range so as to supply it to a demand source (110) that uses low-pressure fuel, such as a power generation engine (113) or a boiler (117).

[0230] The first supply line (L21) can be sequentially connected to the second pump (205), recondenser (202), separator (203), first pump (204), cooler (402), first pressure valve (206), first valve unit (211), and main engine (111).

[0231] The second supply line (L22) can be sequentially connected to the second pump (205), the second pressure valve (207), the second valve unit (212), and the power generation engine (113).

[0232] The third supply line (L23) can be sequentially connected to the second pump (205), the second pressure valve (207), the third valve unit (213), and the boiler (117).

[0233] A vessel (1) according to the third embodiment of the present invention includes a gas treatment system (10) according to the third embodiment of the present invention.

[0234] In the following, with reference to FIGS. 5 and 6, a gas treatment system (10) according to a fourth embodiment of the present invention and a vessel (1) including the same will be described.

[0235] For reference, the gas treatment system (10) according to the fourth embodiment of the present invention of FIGS. 5 and 6 may correspond to or be connected to at least a part of the components included in other embodiments of the present invention.

[0236] In addition, the fuel used in the vessel (1) according to the fourth embodiment of the present invention may be a liquefied gas such as LNG, but is not limited thereto; however, for convenience, the fuel is selected as LNG as the liquefied gas for the following description.

[0237] FIG. 5 is a drawing showing a gas treatment system (10) and a ship (1) according to a fourth embodiment of the present invention. FIG. 6 is a drawing for explaining the arrangement of a fuel recovery tank (350) in a ship (1) according to a fourth embodiment of the present invention.

[0238] Referring to FIGS. 5 and 6, a vessel (1) according to the fourth embodiment of the present invention includes a hull and a cargo area for loading cargo. A gas treatment system (10) according to the fourth embodiment of the present invention includes a fuel storage tank (100), a fuel supply unit, and a fuel discharge unit.

[0239] A fuel storage tank (100) is provided in the hull and can store liquefied gas.

[0240] For example, the fuel storage tank (100) may be configured to store LNG in a liquid state at cryogenic temperatures and may suppress the generation of evaporative gases by including an insulating structure to minimize the inflow of external heat. Additionally, the fuel storage tank (100) may be formed as a single tank or a multiple tank structure depending on the storage capacity, pressure conditions, and installation environment.

[0241] The fuel supply unit can pressurize and vaporize the liquefied gas of the fuel storage tank (100) and supply it to the demand location (110) in a gaseous state.

[0242] The fuel supply unit may include a fuel gas supply system (201).

[0243] For example, the fuel supply unit may include a pump, a vaporizer, and a valve, and can stably supply fuel in response to the required flow rate and pressure conditions of the demand location (110) by pressurizing LNG to a set pressure, converting it into gaseous gas through heat exchange, and delivering it to the demand location (110) through a supply line.

[0244] The fuel discharge unit can discharge the remaining gas from the fuel supply unit when the demand location (110) is in a state where it cannot consume the liquefied gas.

[0245] The fuel supply unit may include a gas valve unit (210).

[0246] The gas valve unit (210) can deliver liquefied gas with controlled temperature and pressure to the demand location (110) according to the requirements of the demand location (110).

[0247] The gas valve unit (210) can be provided adjacent to the demand location (110) that propels the hull.

[0248] The fuel discharge section may include a fuel recovery tank (350) and a fuel recovery line (L30).

[0249] The fuel recovery tank (350) can be provided to be unloaded in a cargo area adjacent to the gas valve unit (210).

[0250] The fuel recovery line (L30) can transfer gas discharged from the fuel supply unit to the fuel recovery tank (350).

[0251] The fuel supply unit may further include a fuel supply line (L20) connected to a demand source (110).

[0252] The fuel recovery line (L30) may be connected to the gas valve unit (210) or branched off upstream of the gas valve unit (210).

[0253] The fuel recovery line (L30) can recover gas from the fuel supply line (L20) and transfer it to the fuel recovery tank (350) when the operation of the demand source (110) is stopped.

[0254] A vessel (1) according to the fourth embodiment of the present invention may further include an engine room (20) and an engine casing (30).

[0255] The engine room (20) is located at the stern of the hull and can accommodate the demand place (110).

[0256] The engine casing (30) is provided on the upper side of the engine room (20) and can discharge exhaust from the demand place (110).

[0257] The fuel recovery tank (350) can be provided in a location adjacent to the engine room (20) and the engine casing (30).

[0258] The vessel (1) according to the fourth embodiment of the present invention may further include a gas valve unit (210) room.

[0259] The gas valve unit (210) room can accommodate the gas valve unit (210).

[0260] The gas valve unit (210) room may be provided inside the engine room (20) (e.g., 40b in FIG. 4) on the lower side of the engine casing (30) relative to the upper deck (11), or outside the engine room (20) (e.g., 40a in FIG. 4) on one side of the engine casing (30).

[0261] The fuel recovery tank (350) can be provided at the rear of the gas valve unit (210) room.

[0262] The fuel recovery line (L30) may include a first recovery valve (310) and a second recovery valve (320).

[0263] The first recovery valve (310) can be provided on the fuel supply line (L20) side.

[0264] The second recovery valve (320) can be provided on the fuel recovery tank (350) side.

[0265] The first recovery valve (310) and the second recovery valve (320) can be opened when the operation of the demand source (110) is stopped.

[0266] That is, when it is necessary to recover residual gas from the fuel supply unit, the first recovery valve (310) and the second recovery valve (320) are opened so that the residual gas can be recovered to the fuel recovery tank (350) through the fuel recovery line (L30).

[0267] The demand source (110) may include a main engine (111), a first power generation engine (113), a second power generation engine (115), and a boiler (117).

[0268] For example, the main engine (111) is a primary power source that generates propulsion for the vessel (1) and can be configured to use LNG as fuel to improve combustion efficiency and reduce exhaust gas. In this case, the main engine (111) may require a relatively large amount of fuel supply depending on the operating load.

[0269] For example, the first power generation engine (113) is a power source responsible for supplying power to the ship (1) or facility, and may be configured to produce electricity using LNG fuel and may be selectively operated in response to power demand while sailing or anchored.

[0270] For example, the second power generation engine (115) may be provided in parallel with or as a backup configuration with the first power generation engine (113), and may be driven independently using LNG as fuel to respond to power load distribution or emergency operation.

[0271] For example, the boiler (117) may be configured to provide a heat source for heating, supplying hot water, or heating auxiliary equipment within the vessel (1), and may generate the necessary thermal energy by burning LNG or vaporized natural gas as fuel.

[0272] The fuel supply line (L20) may include a first supply line (L21), a second supply line (L22), a third supply line (L23), and a fourth supply line (L24).

[0273] The first supply line (L21) can be connected to the main engine (111).

[0274] The second supply line (L22) can be connected to the first power generation engine (113).

[0275] The third supply line (L23) can be connected to the second power generation engine (115).

[0276] The fourth supply line (L24) can be connected to the boiler (117).

[0277] The fuel recovery line (L30) can be connected to the first supply line (L21), the second supply line (L22), the third supply line (L23), and the fourth supply line (L24), respectively.

[0278] The first recovery line (L31) may include a first-1 recovery valve (311), a first-2 recovery valve (312), a first-3 recovery valve (313), and a first-4 recovery valve (314).

[0279] The first-1 recovery valve (311) can be provided on the first supply line (L21) side.

[0280] The first-second recovery valve (312) can be provided on the second supply line (L22) side.

[0281] The first-third recovery valve (313) can be provided on the third supply line (L23) side.

[0282] The first-fourth recovery valve (314) can be provided on the side of the fourth supply line (L24).

[0283] The fuel recovery line (L30) may include a first recovery line (L31), a second recovery line (L32), a third recovery line (L33), and a fourth recovery line (L34).

[0284] The first recovery line (L31) is connected to the first supply line (L21), and a first-1 recovery valve (311) may be provided.

[0285] The second recovery line (L32) is connected to the second supply line (L22), and a first-second recovery valve (312) may be provided.

[0286] The third recovery line (L33) is connected to the third supply line (L23), and a first-third recovery valve (313) may be provided.

[0287] The fourth recovery line (L34) is connected to the fourth supply line (L24), and a first-to-fourth recovery valve (314) may be provided.

[0288] The gas valve unit (210) may include a first valve unit (211), a second valve unit (212), a third valve unit (213), and a fourth valve unit (214).

[0289] For example, the first valve unit (211) can be provided as a gas valve train.

[0290] The first recovery line (L31) can be connected to the first valve unit (211).

[0291] The second recovery line (L32) can be branched off from the upstream side of the second valve unit (212).

[0292] The third recovery line (L33) can be branched off from the upstream side of the third valve unit (213).

[0293] The fourth recovery line (L34) can be branched off from the upstream side of the fourth valve unit (214).

[0294] The first recovery line (L31), the second recovery line (L32), the third recovery line (L33), and the fourth recovery line (L34) can be joined upstream of the branching point where the fuel discharge line (L35) branches off.

[0295] A first pressure sensor (321) for measuring pressure within the line may be provided in the fuel recovery line (L30).

[0296] The first pressure sensor (321) may be provided downstream of the first-1 recovery valve (311) on the first recovery line (L31).

[0297] A vessel (1) according to the fourth embodiment of the present invention includes a gas treatment system (10) according to the fourth embodiment of the present invention.

[0298] The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known technology as another embodiment.

[0299] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention, and the invention is not limited thereto. It will be apparent that modifications or improvements can be made by those skilled in the art within the technical scope of the invention.

[0300] Furthermore, all simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims.

Claims

1. Fuel storage tank for storing liquefied gas; A fuel supply unit that pressurizes and vaporizes the liquefied gas of the above-mentioned fuel storage tank and supplies it to a demand source in a gaseous state; and A fuel discharge unit that discharges residual gas from the fuel supply unit when the above-mentioned demand source is in a state where it cannot consume liquefied gas; is included. The above fuel discharge unit is, A fuel recovery line that transfers the gas discharged from the fuel supply unit to the fuel storage tank; A fuel discharge line branched from the above fuel recovery line and connected to an atmospheric discharge device; and A gas treatment system comprising: a control unit that controls the gas flow of the fuel recovery line and the fuel discharge line according to the internal pressure of the fuel storage tank.

2. In Paragraph 1, The above control unit is, In the event that the operation of the above demand source is interrupted, the residual gas of the above fuel supply unit is transferred to the above fuel storage tank through the above fuel recovery line, and A gas treatment system that allows residual gas from the fuel supply unit to be transferred to the atmospheric discharge device through the fuel discharge line when the interior of the fuel storage tank is in an overpressure state.

3. In Paragraph 1, The above fuel supply unit is, A fuel supply line connected to the above-mentioned demand source; and A gas valve unit provided on the fuel supply line and delivering liquefied gas, with its temperature and pressure controlled according to the requirements of the demand source, to the demand source; comprising The above fuel recovery line is, A gas treatment system connected to the above gas valve unit or branched upstream of the above gas valve unit.

4. In Paragraph 3, The above fuel recovery line is, A first recovery valve provided on the fuel supply line side; and It includes a second recovery valve provided on the fuel storage tank side; and The above fuel discharge line is, A gas treatment system comprising a discharge valve; and branching between the first recovery valve and the second recovery valve.

5. In Paragraph 4, The above control unit is, If the operation of the above-mentioned demand source is interrupted, the first recovery valve and the second recovery valve are opened, and the discharge valve is closed. A gas treatment system that closes the second recovery valve and opens the discharge valve when the interior of the fuel storage tank is in an overpressure state.

6. In Paragraph 4, The above-mentioned customer is, It includes a main engine, a first power generation engine, a second power generation engine, and a boiler, The above fuel supply line is, A first supply line connected to the main engine above; A second supply line connected to the first power generation engine; A third supply line connected to the second power generation engine; and A gas treatment system comprising a fourth supply line connected to the above boiler.

7. In Paragraph 6, The above fuel recovery line is, Each is connected to the first supply line, the second supply line, the third supply line, and the fourth supply line, respectively. The above-mentioned first recovery valve is, A first-1 recovery valve provided on the first supply line side; A first-2 recovery valve provided on the second supply line side above; A first-third recovery valve provided on the third supply line side; and A gas treatment system comprising: a first- to fourth recovery valve provided on the side of the fourth supply line.

8. In Paragraph 1, The above fuel supply unit is, It includes a gas valve unit that delivers liquefied gas, with its temperature and pressure controlled according to the requirements of the above-mentioned demand source, to the above-mentioned demand source; and The above fuel recovery line is, The gas remaining in the fuel supply unit is transferred to the fuel storage tank through the above gas valve unit, Gas is recovered for the first section between the fuel storage tank and the gas valve unit, and gas is also recovered for the second section between the gas valve unit and the demand source through the gas valve unit. A gas processing system that recovers gas for the first section and gas for the second section and delivers them to the fuel storage tank when the operation of the above-mentioned demand source is interrupted.

9. In Paragraph 8, The above fuel supply unit is, It further includes a fuel supply line connected to the above-mentioned demand source, The above fuel supply line is, The first section upstream of the above gas valve unit and A gas treatment system comprising the second section downstream of the above gas valve unit.

10. In Paragraph 9, The above gas valve unit is, If the operation of the above-mentioned demand source is interrupted, both the above-mentioned first section and the above-mentioned second section are opened, and The above fuel recovery line is, An oil filter is provided on the gas valve unit side, and A gas treatment system that recovers residual gas inside the first section and residual gas inside the second section of the fuel supply line together through the gas valve unit, and filters oil flowing in together with the gas through the oil filter.

11. In Paragraph 1, A liquefaction unit that liquefies the evaporated gas of the fuel storage tank into the liquefied gas of the fuel supply unit; further comprising The above fuel supply unit is, Recondenser that mixes evaporated gas with liquefied gas; A first pump provided downstream of the above-mentioned recondenser and pressurizing liquefied gas; and A separator for gas-liquid separation provided between the above-mentioned recondenser and the above-mentioned first pump; comprising The above fuel recovery line is, The gas discharged from the above fuel supply unit is transferred to the above separator, and The above liquefaction unit is, A compressor for compressing evaporative gas generated in the above fuel storage tank; and A gas treatment system comprising: a cooler for cooling the evaporated gas compressed by the above compressor.

12. In Paragraph 11, The above separator is, The gas discharged from the fuel supply unit is mixed with the liquefied gas or evaporated gas delivered from the recondenser, and then gas-liquid separation is performed, and the separated liquefied gas is delivered to the first pump. A gas processing system in which liquefied gas separated through the separator passes sequentially through the first pump and the cooler and is supplied to the demand source.

13. In Paragraph 1, A cargo area provided in the hull for loading cargo; and The above gas treatment system; including, The above fuel supply unit is, A gas valve unit provided adjacent to a demand source propelling the above-mentioned hull, and delivering liquefied gas with temperature and pressure controlled according to the requirements of the said demand source to the said demand source; and A fuel supply line connected to the above-mentioned demand source; including, The above fuel discharge unit is, It further includes a fuel recovery tank configured to be unloadable in the cargo area adjacent to the gas valve unit; The above fuel recovery line is, The gas discharged from the above fuel supply unit is transferred to the above fuel recovery tank, The above fuel recovery line is, A vessel connected to the above gas valve unit or branched off upstream of the above gas valve unit, and recovering gas from the fuel supply line and transferring it to the fuel recovery tank when the operation of the above demand source is stopped.

14. In Paragraph 13, An engine room provided at the stern of the hull and accommodating the demand location; and It further includes an engine casing provided at the stern of the hull, positioned above the engine room, for discharging exhaust from the demand source; The above fuel recovery tank is provided in a location adjacent to the above engine room and the above engine casing, in a ship.

15. In Paragraph 14, The apparatus further includes a gas valve unit room that accommodates the above gas valve unit and is provided inside the engine room at the lower side of the engine casing or provided outside the engine room at one side of the engine casing. The above fuel recovery tank is a ship provided at the rear of the above gas valve unit room.

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