KR101644384B1 - Fuel gas supplying system in ships - Google Patents

Fuel gas supplying system in ships Download PDF

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Publication number
KR101644384B1
KR101644384B1 KR1020150075706A KR20150075706A KR101644384B1 KR 101644384 B1 KR101644384 B1 KR 101644384B1 KR 1020150075706 A KR1020150075706 A KR 1020150075706A KR 20150075706 A KR20150075706 A KR 20150075706A KR 101644384 B1 KR101644384 B1 KR 101644384B1
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KR
South Korea
Prior art keywords
gas
nitrogen
separator
concentration
line
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KR1020150075706A
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Korean (ko)
Inventor
이효은
최재웅
고민수
윤호병
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삼성중공업 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention relates to a fuel gas supplying system in ships. According to an embodiment of the present invention, the fuel gas supplying system comprises: a storage tank to receive a liquefied gas and an evaporation gas; a first fuel gas supply line provided with a compression unit to pressurize the evaporation gas of the storage tank, and to supply the pressurized evaporation gas to a first engine; a nitrogen separator to separate a portion of the pressurized evaporation gas into a first gas flow containing nitrogen component having a first concentration and a second gas flow containing nitrogen component having a second concentration; a nitrogen consuming line to supply the first gas flow separated by the nitrogen separator to the first engine; and a re-liquefaction line to receive and re-liquefy the second gas flow separated by the nitrogen separator.

Description

[0001] FUEL GAS SUPPLYING SYSTEM IN SHIPS [0002]

The present invention relates to a fuel gas supply system, and more particularly, to a fuel gas supply system for a ship capable of efficiently using and managing fuel gas.

As IMO regulations on the emission of greenhouse gases and various air pollutants are strengthened, shipbuilding and marine industries are replacing the use of conventional oil and diesel oil with natural gas, which is a clean energy source, In many cases.

Natural gas is typically a liquefied natural gas (Liquefied Natural Gas), a colorless transparent cryogenic liquid with a volume reduced to 1/600 by cooling the natural gas to about -162 degrees Celsius for ease of storage and transportation. Management and operation.

Such liquefied natural gas is contained in a storage tank installed in an insulated manner on the hull and stored and transported. However, since it is virtually impossible to completely contain the liquefied natural gas, the external heat is continuously transferred to the inside of the storage tank, and the evaporated gas generated by naturally vaporizing the liquefied natural gas is accumulated in the storage tank . It is necessary to treat and remove the evaporated gas since the evaporated gas may increase the internal pressure of the storage tank and cause deformation and damage of the storage tank.

Conventionally, evaporation gas is flowed into a vent mast provided on the upper side of a storage tank, or a method of burning evaporation gas by using a GCU (Gas Combustion Unit) has been used. However, this is not desirable from the viewpoint of energy efficiency. Therefore, a method of re-liquefying the evaporation gas by supplying the evaporation gas with the liquefied natural gas or the fuel gas to the engine of the ship respectively, or using the re- .

Natural gas, on the other hand, is a mixture containing not only methane but also ethane, propane, butane, nitrogen and the like. The nitrogen boiling point is about -195.8 degrees Celsius, which is much lower than that of methane (boiling point -161.5 degrees) and ethane (boiling point-89 degrees Celsius).

As a result, the evaporation gas generated from the natural vaporization in the storage tank contains a large amount of nitrogen component having a relatively low boiling point, which causes deterioration of the re-liquefaction efficiency of the evaporation gas and thus affects the utilization and treatment of the evaporation gas I am crazy.

Accordingly, there is a need for a method capable of effectively treating the nitrogen component contained in the evaporated gas to improve the efficiency of re-liquefaction of the evaporated gas, and to efficiently utilize and manage the fuel gas.

Korean Patent Publication No. 10-2010-0035223 (published on Apr. 05, 2010)

An embodiment of the present invention is to provide a fuel gas supply system capable of improving the re-liquefaction efficiency of evaporation gas.

An embodiment of the present invention seeks to provide a fuel gas supply system that can efficiently use and manage fuel gas.

An embodiment of the present invention is intended to provide a fuel gas supply system that can efficiently utilize and consume nitrogen components contained in an evaporative gas.

The embodiment of the present invention is intended to provide a fuel gas supply system that can achieve efficient facility operation with a simple structure.

An embodiment of the present invention is to provide a fuel gas supply system capable of improving energy efficiency.

According to an aspect of the present invention, there is provided a gas turbine engine comprising a storage tank for storing a liquefied gas and an evaporated gas, a first portion for supplying a vaporized gas pressurized by the compressed portion to a first engine, A fuel gas supply line, a nitrogen separator for receiving a portion of the pressurized evaporated gas and separating the gas stream into a first gas stream containing a first concentration of nitrogen component and a second gas stream containing a second concentration of nitrogen component, A nitrogen exhaust line for supplying the first gas flow separated by the separator to the first engine, and a re-liquefaction line for re-liquefying the second gas flow separated by the nitrogen separator.

The nitrogen separator may be provided with a cyclone.

The nitrogen separator may be provided with a gas centrifuge.

The nitrogen separator may be provided with a vortex tube.

And the second liquefaction line comprises a first expansion valve for primarily depressurizing the second gas flow, a cooling section for cooling the second gas flow passing through the first expansion valve, And a gas-liquid separator for separating the gas-liquid mixture component into a gas component and a liquid component through the second expansion valve and the second expansion valve.

Liquid separator, wherein the re-liquefaction line comprises a liquefied gas recovery line for supplying the liquid component separated in the gas-liquid separator to the storage tank, and a gas-liquid separator for separating the gas component separated from the gas-liquid separator in the storage tank or the front portion And an evaporative gas recovery line for supplying the evaporative gas to the evaporator.

The cooling unit may be provided with a heat exchanger for heat-exchanging the second gas flow with the evaporation gas before the compression unit.

And a second fuel gas supply line branched from the intermediate portion of the compression unit and supplying a partially pressurized evaporated gas to the second engine or the GCU (Gas Combustion Unit) by the compression unit.

The nitrogen component of the first concentration may be provided to contain a nitrogen component at a higher concentration than the nitrogen component of the second concentration.

The fuel gas supply system according to the embodiment of the present invention has the effect of improving the efficiency and performance of re-liquefaction of the evaporation gas.

The fuel gas supply system according to the embodiment of the present invention has an effect of efficiently using and consuming the nitrogen component contained in the evaporation gas.

The fuel gas supply system according to the embodiment of the present invention has the effect of efficiently utilizing and managing the fuel gas.

The fuel gas supply system according to the embodiment of the present invention has an effect of improving the energy efficiency.

The fuel gas supply system according to the embodiment of the present invention has an effect of enabling efficient facility operation as a simple structure.

1 is a conceptual diagram showing a fuel gas supply system 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 following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 is a conceptual diagram showing a fuel gas supply system 100 according to an embodiment of the present invention.

Referring to FIG. 1, a fuel gas supply system 100 according to an embodiment of the present invention includes a storage tank 110, a compression unit 121 for pressurizing evaporative gas of the storage tank 110, a compression unit 121 A first fuel gas supply line 120 for supplying a pressurized evaporative gas to the first engine, a first fuel gas supply line 120 for supplying a pressurized evaporative gas to the first engine, A nitrogen consumption line 140 for supplying a first gas flow containing a nitrogen component of a first concentration separated by the nitrogen separator 130 and the nitrogen separator 130 to the first engine, A re-liquefaction line 150 for re-liquefying the second gas flow containing the nitrogen component of the second concentration separated from the second engine, Or a second fuel gas supply line 160 for supplying the gas to the gas-combus- tion unit (GCU) There.

In the following examples, liquefied natural gas and evaporative gas generated therefrom are used as an example to help understand the present invention. However, the present invention is not limited thereto, and various liquefied gases such as liquefied ethane gas and liquefied hydrocarbon gas, The same technical idea should be understood in the same way.

The storage tank 110 is provided to receive or store the liquefied natural gas and the evaporative gas generated therefrom. The storage tank 110 may be provided with a membrane-type cargo hold that is heat-treated to minimize vaporization of liquefied natural gas due to external heat penetration. The storage tank 110 stores the liquefied natural gas and the evaporation gas in a stable manner until the liquefied natural gas is received from the production site of the natural gas, The power generation engine of the present invention can be used as a fuel gas.

Since the storage tank 110 is generally installed in a heat-treated state, it is practically difficult to shut off the intrusion of external heat completely. Therefore, there is an evaporative gas generated by naturally vaporizing the liquefied natural gas in the storage tank 110 do. Such evaporated gas raises the internal pressure of the storage tank 110, and there is a risk of deformation and explosion of the storage tank 110. Therefore, it is necessary to remove or treat the evaporated gas from the storage tank 110. [ Accordingly, the evaporated gas generated in the storage tank 110 can be used as the fuel gas of the engine by the first fuel gas supply line 120 or the second fuel gas supply line 160 as in the embodiment of the present invention, Liquefied by the liquefaction line 150 and re-supplied to the storage tank 110. In addition, although not shown in the drawing, the evaporation gas may be supplied or consumed by supplying a vent mast (not shown) provided at an upper portion of the storage tank 110.

The engine may be supplied with fuel gas such as liquefied natural gas and vaporized gas stored in the storage tank 110 to generate propulsive force of the ship or generate electric power for power generation such as internal equipment of the ship. The engine may include a first engine that generates an output by receiving a relatively high-pressure fuel gas, and a second engine that generates an output by receiving a relatively low-pressure fuel gas. For example, the first engine may be an ME-GI engine or an X-DF engine capable of generating an output with a relatively high-pressure fuel gas, and the second engine may include a DFDE An engine, or the like. However, the present invention is not limited thereto, and it should be equally understood that various numbers of engines and various kinds of engines are used.

The first fuel gas supply line 120 pressurizes the evaporation gas present in the storage tank 110 and supplies the pressurized gas as a fuel gas to the first engine and the second engine or to the refueling line 150 through the nitrogen separator 130. [ As shown in Fig. The first fuel gas supply line 120 has an inlet end connected to the inside of the storage tank 110, an outlet end connected to the first engine, and a second fuel gas supply line 160 connected to the outlet, And the evaporation gas supply line 125 may be branched. The first fuel gas supply line 120 is provided with a compression section 121 having a plurality of stages of compressors 121a so that the evaporation gas can be processed according to the conditions required by the engine.

The compression unit 121 may include a compressor 121a for compressing the evaporated gas and a cooler 121b for cooling the heated evaporated gas while being compressed. In the case where the engine is composed of a plurality of engines having different pressure conditions, the second fuel gas supply line 160, which will be described later, branches from the intermediate portion of the compression portion 121 to supply the evaporated gas partially pressurized by the second engine or the GCU .

1, the compression unit 121 is composed of five compressors 121a and a cooler 121b. However, the compression unit 121 may have various numbers of compressors A compressor 121a and a cooler 121b. A cooling unit 152 of a re-liquefying line 150, which will be described later, may be installed at a front end of the compression unit 121 on the first fuel gas supply line 120, and a detailed description thereof will be given later.

The nitrogen separator 130 is provided to separate a nitrogen component contained in the pressurized evaporated gas by supplying a part of the pressurized evaporative gas through the compression unit 121.

The nitrogen separator 130 may be supplied with a part of the evaporated gas pressurized through the evaporation gas supply line 125 provided at the downstream end of the compression section 121 on the first fuel gas supply line 120. The nitrogen separator 130 separates the pressurized evaporation gas into a first gas flow containing a first concentration of nitrogen component and a second gas flow containing a second concentration of nitrogen component, (140) to be used as fuel gas to the first engine, and the second gas flow is provided to supply to the refueling line (150) described later.

The nitrogen component of the first concentration and the nitrogen component of the second concentration, which are described in this embodiment, refer to a nitrogen component of a high concentration and a nitrogen component of a low concentration, respectively. The nitrogen component of the first concentration is compared with the nitrogen component of the second concentration And the nitrogen component of the second concentration has a relatively low nitrogen component as compared with the nitrogen component of the first concentration. The first concentration and the second concentration are not limited to a specific value but should be understood as relative terms depending on the concentration difference between the first concentration and the second concentration.

Natural gas is a mixture containing ethane, propane, butane, nitrogen and the like in addition to the main component methane. Among them, the boiling point of nitrogen is about -195.8 degrees Celsius, which is much lower than that of methane (boiling point -161.5 degrees Celsius) and ethane (boiling point -89 degrees Celsius). Accordingly, the natural evaporation gas generated by spontaneously vaporizing in the storage tank 110 is relatively vaporized with a relatively low boiling point nitrogen component, thereby containing a large amount of nitrogen component. When the evaporation gas is to be re-liquefied, the re-liquefaction efficiency becomes lower as the concentration of the nitrogen component of the evaporation gas increases, because the nitrogen component has a low boiling point and is thus difficult to re-cure.

The nitrogen separator 130 receives a portion of the pressurized evaporation gas through the first fuel gas supply line 120 and the evaporation gas supply line 125, separates the nitrogen component contained therein, The first gas stream containing the components is supplied to the fuel gas of the first engine and the second concentration of nitrogen components is fed to the re-liquefaction line 150, whereby the re- Can be improved.

The nitrogen separator 130 may be any one of a cyclone, a gas centrifuge, or a vortex tube.

Cyclone forms a part of the pressurized evaporation gas supplied through the evaporation gas supply line 125 as a swirling flow and exerts a centrifugal force on the evaporation gas to separate nitrogen components and components other than nitrogen such as methane and ethane It can be separated into a first gas flow containing a first concentration of nitrogen component and a second gas flow containing a second concentration of nitrogen component of a relatively low concentration.

A gas centrifuge is provided to separate a portion of the pressurized evaporated gas in a gaseous mixture state by centrifugation. The gas centrifuge separates a portion of the pressurized evaporation gas supplied through the evaporation gas supply line 125 into a component other than nitrogen component and nitrogen component by centrifugal force so that a part of the pressurized evaporation gas flows into the first gas flow and the second Gas flow.

The Vortex tube is a device that has a narrow tube and separates the hot air stream from the cold air stream by supplying a high pressure gas in a tangential form inside a narrow tube. When the nitrogen separator 130 is formed of a vortex tube, the pressurized evaporation gas supplied through the evaporation gas supply line 125 is supplied to the interior of the vortex tube, and a low temperature nitrogen component having a relatively low boiling point, By separating components other than nitrogen, such as high methane, ethane, a portion of the pressurized vapor can be separated into a first gas stream and a second gas stream.

As described above, the nitrogen separator 130 is composed of a cyclone, a gas centrifuge or a vortex tube, so that a part of the pressurized evaporation gas is separated into the first gas flow and the second gas flow according to the concentration of the nitrogen component, The second gas flow containing a low concentration of nitrogen component may be supplied to the re-liquefaction line 150 to improve the liquefaction efficiency of the re-liquefaction line 150, and the first gas flow containing a high concentration of the nitrogen component By consuming the fuel gas through the nitrogen consumption line 140, the total nitrogen content in the fuel gas system 100 can be gradually lowered to improve the facility operation efficiency.

A first gas stream separated by the nitrogen separator 130 and containing a nitrogen component of a first concentration can be supplied to the first engine as fuel gas through the nitrogen exhaust line 140. The first gas flow containing a relatively large amount of nitrogen components among the gas flows separated by the nitrogen separator 130 is used and consumed as the fuel gas so as to make efficient use of the fuel gas and to improve the re- Can be increased. The nitrogen consumption line 140 may be connected to the first fuel gas supply line 120 so that the outlet end of the nitrogen consumption line 140 joins the first fuel gas supply line 120. Although not shown in the figure, the nitrogen consumption line 140 is provided with a flow control valve And the supply amount of the first gas flow may be adjusted according to the required calorific value of the first engine.

The re-liquefying line 150 may be provided to separate and re-liquefy the second gas flow containing the second concentration of nitrogen component by the nitrogen separator 130.

The re-liquefaction line 150 includes a first expansion valve 151 for primarily depressurizing the second gas flow, a cooling section 152 for cooling the second gas flow passing through the first expansion valve 151, A second expansion valve 153 that secondarily reduces the second gas flow that has passed through the first expansion valve 152 and a second expansion valve 153 that separates the vaporized gas in the gas-liquid mixed state into a gas component and a liquid component Liquid separator 154 and the gas-liquid separator 154 to the storage tank 110 and the gas component separated by the gas-liquid separator 154 into the storage tank 110 or the gas- And an evaporated gas recovery line 156 for re-supplying the exhaust gas to the first fuel gas supply line 120 side.

The first expansion valve 151 is provided to primarily depressurize the second gas flow separated by the nitrogen separator 130. The first expansion valve 151 can increase the re-liquefaction efficiency by previously reducing the pressure and cooling the second gas flow and then supplying it to the cooling unit 152. [ The first expansion valve 151 may be provided to vary the degree of decompression depending on the content of the nitrogen component of the second gas flow for maximizing the re-liquefaction efficiency. For example, when the second gas flow is pressurized to about 300 bar by the compression unit 121 and the nitrogen component is separated by the nitrogen separator 130 so that the concentration of the nitrogen component is about 10 mole% or less, (151) can reduce the second gas flow to 140 bar to 160 bar and supply it to the cooling part (152). In contrast, as the nitrogen component is further separated by the nitrogen separator 130 and the concentration of the nitrogen component is lowered, the first expansion valve 151 reduces the degree of decompression of the second gas flow more greatly, The liquefaction efficiency can be increased. The first expansion valve 151 may be a Joule-Thomson valve, but may be a variety of devices such as an expander if the second gas flow can be reduced.

The cooling unit 152 is provided to cool the second gas flow that has been primarily reduced through the first expansion valve 151. [ The cooling unit 152 may be a heat exchanger for heat-exchanging the second gas flow with the evaporated gas before the compression unit 121 conveyed along the first fuel gas supply line 120. Since the second gas flow is pressurized by the compression section 121 and the temperature and the pressure are increased, the second gas flow is heat-exchanged with the low-temperature evaporation gas before passing through the compression section 121 on the first fuel gas supply line 120, The gas flow can be cooled. By providing the cooling section 152 as a heat exchanger in this way, the pressurized evaporated gas can be cooled without a separate cooling device, so unnecessary waste of electric power can be prevented, facilities can be simplified, and facility operation efficiency can be achieved.

The second expansion valve 153 may be provided at the rear end of the cooling section 152. The second expansion valve 153 can reduce the second gas flow sequentially passing through the first expansion valve 151 and the cooling section 152 to achieve re-liquefaction of the second gas flow. The second expansion valve 153 can reduce the pressure of the second gas flow to a pressure level corresponding to the internal pressure of the storage tank 110. The second expansion valve 153 may include, for example, a Joule-Thomson valve, but may include a variety of devices such as an expander.

The gas-liquid separator 154 is cooled and decompressed while passing through the second expansion valve 153 to receive the second gas flow in the vapor-liquid mixed state, and to separate the liquid component and the gas component. When the second gas flow passes through the second expansion valve 153, most of the re-liquidization is performed, but a flash gas is generated in the process of reducing pressure, so that a gas component may be generated. Thus, the separated liquid component of the second gas flow sequentially passed through the first expansion valve 151, the cooling section 152, and the second expansion valve 153 and supplied to the gas-liquid separator 154 is supplied to the liquid- The separated gas components are supplied to the storage tank 110 or the first fuel gas supply line 120 by the evaporation gas recovery line 156 to be described later .

The liquefied gas recovery line 155 may be provided to connect the gas-liquid separator 154 and the storage tank so as to re-supply the liquid component separated by the gas-liquid separator 154 to the storage tank 110. The liquefied gas recovery line 155 may be provided such that its inlet side end communicates with the lower side of the gas-liquid separator 154 and its outlet side end communicates with the interior of the storage tank 110. The liquefied gas recovery line 155 may be provided with an on-off valve (not shown) for regulating the supply amount of the re-liquefied second gas flow recovered to the storage tank 110.

The evaporated gas recovery line 156 is connected to the gas-liquid separator 154 and the storage tank 110 so as to re-supply the gas components separated by the gas-liquid separator 154 to the storage tank 110 or the first fuel gas supply line 120. [ Or may be provided between the gas-liquid separator 154 and the first fuel gas supply line 120. 1 shows that the gas component in the gas-liquid separator 154 is supplied again to the upstream side of the compression unit 121 on the first fuel gas supply line 120 in the vapor-liquid recovery line 156, The first fuel gas supply line 120 and the storage tank 110 are supplied from the first fuel gas supply line 154 to the storage tank 110 or the first fuel gas supply line 120 and the storage tank 110, respectively.

The second fuel gas supply line 160 is branched from the intermediate portion of the compression unit 121 of the first fuel gas supply line 120 and is provided to supply the partially pressurized evaporative gas to the second engine or the GCU. The second fuel gas supply line 160 may be provided such that the inlet side end portion is connected to the intermediate portion of the compression portion 121 and the outlet side end portion is branched so that one side is connected to the second engine and the other side is connected to the GCU .

Since the second engine generates the output by receiving the relatively low-pressure fuel gas, the second engine is branched from the intermediate portion of the compression unit 121 that compresses the evaporated gas, . When the supply amount of the partially pressurized evaporative gas supplied through the second fuel gas supply line 160 is larger than the supply amount of the fuel gas required by the second engine, the GCU supplies and consumes the surplus pressurized evaporative gas .

The fuel gas supply system 100 according to an embodiment of the present invention having such a structure is configured to supply a portion of the evaporated gas pressurized by the nitrogen separator 130 composed of a cyclone, a gas centrifuge or a vortex tube to a nitrogen component And a second gas flow containing a second concentration of nitrogen component and supplying the second gas flow to the re-liquefaction line (140) to re-liquefy, thereby reducing the re-liquefaction efficiency of the evaporation gas .

In addition, the first gas flow, which is inferior in the re-liquefying efficiency, is used and consumed as the fuel gas of the engine, so that the efficient use and management of the fuel gas can be achieved and the continuous reduction of the total nitrogen content in the fuel gas supply system 100 The efficiency of re-liquefaction can be increased and the facility can be operated efficiently.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

100: fuel gas supply system 110: storage tank
120: first fuel gas supply line 121: compression unit
130: nitrogen separator 140: nitrogen consumption line
150: re-liquefaction line 151: first expansion valve
152: cooling section 153: second expansion valve
154: gas-liquid separator 155: liquefied gas recovery line
156: Evaporative gas recovery line 160: Second fuel gas supply line

Claims (9)

A storage tank for storing the liquefied gas and the evaporated gas;
A first fuel gas supply line provided with a compression unit for pressurizing the evaporation gas of the storage tank and supplying the evaporation gas pressurized by the compression unit to the first engine;
A nitrogen separator for separating the nitrogen component contained in the evaporation gas into a first gas flow containing a first concentration of nitrogen component and a second gas flow containing a second concentration of nitrogen component, ;
A nitrogen consumption line for supplying said first gas flow separated by said nitrogen separator to said first engine;
And a re-liquefaction line for re-liquefying the second gas flow separated by the nitrogen separator,
The re-liquefaction line
A first expansion valve provided in the first expansion valve to primarily reduce the second gas flow and adjust the degree of decompression according to the nitrogen content of the second gas flow; A second expansion valve that secondarily reduces the second gas flow that has passed through the cooling section; and a gas-liquid separator that separates the vaporized gas in the gas-liquid mixed state from the gas- And a separator. The method according to claim 1,
The nitrogen separator
A fuel gas supply system comprising a cyclone. The method according to claim 1,
The nitrogen separator
A gas fuel supply system comprising a gas centrifuge. The method according to claim 1,
The nitrogen separator
A fuel gas delivery system comprising a vortex tube. delete The method according to claim 1,
The re-liquefaction line
Liquid separator; a liquefied gas recovery line for supplying the liquid component separated in the gas-liquid separator to the storage tank; and a vaporizing gas supply unit for supplying a gas component separated in the gas- Further comprising a recovery line. The method according to claim 6,
The cooling unit
And a heat exchanger for heat-exchanging the second gas flow with the evaporation gas at the upstream end of the compression section. 8. The method of claim 7,
And a second fuel gas supply line which branches from a middle portion of the compression section and supplies the partially pressurized evaporated gas to the second engine or a GCU (Gas Combustion Unit) by the compression section. The method according to claim 1,
The nitrogen component of the first concentration
And a nitrogen component at a higher concentration than the nitrogen component at the second concentration.


KR1020150075706A 2015-05-29 2015-05-29 Fuel gas supplying system in ships KR101644384B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006160977A (en) * 2004-12-10 2006-06-22 Mitsui Eng & Shipbuild Co Ltd Method and system for splitting natural gas hydrate
KR20080057461A (en) * 2006-12-20 2008-06-25 신영중공업주식회사 Lng bog reliquefaction apparatus and method
KR20100035223A (en) 2008-09-26 2010-04-05 현대중공업 주식회사 Fuel gas supply system for lng carrier using duel fuel diesel electric propulsion engine
KR20110012917A (en) * 2009-07-31 2011-02-09 삼성중공업 주식회사 Apparatus for treating boil-off gas
KR20120006621A (en) * 2010-07-13 2012-01-19 (주) 에이에프에스 An impurities filtering apparatus which is filled of natural gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006160977A (en) * 2004-12-10 2006-06-22 Mitsui Eng & Shipbuild Co Ltd Method and system for splitting natural gas hydrate
KR20080057461A (en) * 2006-12-20 2008-06-25 신영중공업주식회사 Lng bog reliquefaction apparatus and method
KR20100035223A (en) 2008-09-26 2010-04-05 현대중공업 주식회사 Fuel gas supply system for lng carrier using duel fuel diesel electric propulsion engine
KR20110012917A (en) * 2009-07-31 2011-02-09 삼성중공업 주식회사 Apparatus for treating boil-off gas
KR20120006621A (en) * 2010-07-13 2012-01-19 (주) 에이에프에스 An impurities filtering apparatus which is filled of natural gas

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