KR101672196B1 - Fuel gas supplying system in ships - Google Patents

Fuel gas supplying system in ships Download PDF

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Publication number
KR101672196B1
KR101672196B1 KR1020150080542A KR20150080542A KR101672196B1 KR 101672196 B1 KR101672196 B1 KR 101672196B1 KR 1020150080542 A KR1020150080542 A KR 1020150080542A KR 20150080542 A KR20150080542 A KR 20150080542A KR 101672196 B1 KR101672196 B1 KR 101672196B1
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KR
South Korea
Prior art keywords
gas
line
calorific value
fuel gas
gas flow
Prior art date
Application number
KR1020150080542A
Other languages
Korean (ko)
Inventor
이원두
최재웅
윤호병
Original Assignee
삼성중공업 주식회사
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Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020150080542A priority Critical patent/KR101672196B1/en
Priority to CN201680008507.9A priority patent/CN107848605B/en
Priority to PCT/KR2016/000818 priority patent/WO2016126037A1/en
Priority to JP2017557258A priority patent/JP6498785B2/en
Application granted granted Critical
Publication of KR101672196B1 publication Critical patent/KR101672196B1/en
Priority to JP2018169653A priority patent/JP6843099B2/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • 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
    • 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
    • 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
    • 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
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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
    • F02M25/089—Layout of the fuel vapour installation
    • 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
    • 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

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

Abstract

A fuel gas supply system is disclosed. A fuel gas supply system according to an embodiment of the present invention includes a storage tank for storing a liquefied gas and an evaporation gas, an evaporation gas supply line having a compression unit for pressurizing the evaporation gas of the storage tank, A nitrogen separator for separating 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 first fuel gas supply line And a re-liquefaction line for supplying and re-liquefying the second gas flow.

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).

Accordingly, the evaporation gas generated by naturally vaporizing 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, thereby affecting the utilization and treatment of the evaporation gas I am crazy.

In addition, when the evaporation gas is supplied to the engine of the ship as the fuel gas, the nitrogen component of the evaporation gas affects the decrease in the calorific value of the fuel gas, thereby improving the liquefaction efficiency of the evaporation gas and the calorific value of the fuel gas, It is necessary to plan for citation and management.

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 capable of effectively regulating and maintaining the calorific value of the fuel gas supplied to the engine.

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 an evaporation apparatus comprising: a storage tank for storing a liquefied gas and an evaporation gas; an evaporation gas supply line having a compression section for pressurizing the evaporation gas of the storage tank; Into a first gas flow containing a nitrogen component of a first concentration and a second gas flow containing a second concentration of nitrogen component, a first fuel gas supply line supplying the first gas flow to a first engine, And a re-liquefaction line for supplying and re-liquefying the second gas flow.

The nitrogen separator may be provided including a membrane filter.

The second liquefaction line comprises a heat exchange unit for exchanging the second gas flow with the evaporation gas at the upstream end of the compression unit, an expansion valve for reducing the pressure of the second gas flow which has passed through the heat exchange unit and heat- A gas-liquid separator for separating the decompressed second gas flow into a gas component and a liquid component, a liquefied gas recovery line for supplying the liquid component of the second gas flow separated in the gas-liquid separator to the storage tank, And an evaporative gas recovery line for supplying the gas component of the second gas stream to the upstream side of the compression section on the storage tank or the evaporative gas supply line.

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

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 the effect of efficiently utilizing and managing the fuel gas.

The fuel gas supply system according to the embodiment of the present invention has the effect of effectively controlling and maintaining the calorific value of 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.
2 is a conceptual diagram showing a fuel gas supply system according to another 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, an evaporation gas supply unit 120 having a compression unit 121 for pressurizing evaporation gas of the storage tank 110, A line 120, a nitrogen separator 130 for separating the nitrogen component contained in the evaporated gas pressurized by the compressing section 121, a first nitrogen component separator 130 for separating nitrogen components contained in the first concentration nitrogen component separated by the nitrogen separator 130, A refueling line 140 for re-liquefying a second gas stream containing a second concentration of nitrogen component separated by the nitrogen separator 130, a first fuel gas supply line 150 for supplying the gas stream to the first engine, A second fuel gas supply line 170 branched from the stop of the compression unit 121 and supplying a partially pressurized evaporated gas to the second engine or GCU (Gas Combustion Unit) by the compression unit 121, And a calorific value adjustment unit 160 for measuring and adjusting the calorific value of the supplied fuel gas .

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. [ The evaporated gas generated in the storage tank 110 may be used as the fuel gas of the engine by the first fuel gas supply line 150 or the second fuel gas supply line 170 as in the embodiment of the present invention, Liquefied by the liquefaction line (140) 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 evaporation gas supply line 120 pressurizes the evaporation gas present in the storage tank 110 and supplies it as fuel gas to the second engine or to the first engine and refueling line 140 via the nitrogen separator 130 . The evaporation gas supply line 120 is provided with an inlet side end connected to the inside of the storage tank 110 and an outlet side end is connected to the first fuel gas supply line 150 through the nitrogen separator 130, Line 140 as shown in FIG. The evaporation gas supply line 120 is provided with a compression unit 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. When the engine is composed of a plurality of engines having different pressure conditions, the second fuel gas supply line 170, which will be described later, branches from the intermediate portion of the compression section 121 to supply the evaporated gas partially pressurized by the second engine or GCU .

The pressure of the compressed gas that has been pressurized by the compressing unit 121 may pass through the nitrogen separator 130 as described later so that the pressure of the compressed gas may decrease. It is possible to pressurize and supply the evaporation gas to a pressure higher than the pressure condition by a predetermined magnitude.

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. Further, a heat exchanging unit 141 of a re-liquefaction line 140, which will be described later, may be installed at a front end of the compression unit 121 on the evaporation gas supply line 120, and a detailed description thereof will be described later.

The nitrogen separator 130 may be provided at the outlet side end of the evaporation gas supply line 120 so as to separate nitrogen components contained in the pressurized evaporated gas passing through the compression section 121. The nitrogen separator 130 classifies the pressurized evaporative 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, 1 fuel gas supply line 150 to be used as fuel gas to the first engine and the second gas flow is provided to supply to the refueling line 140 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). As a result, the natural evaporation gas generated by spontaneous vaporization in the storage tank 110 is vaporized to a large extent by the nitrogen component having a low boiling point. 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 separates the nitrogen component contained in the pressurized evaporated gas through the evaporation gas supply line 120 so that the first gas stream containing the nitrogen component of the first concentration passes through the fuel gas And the nitrogen component of the second concentration is supplied to the re-liquefaction line 140, so that the performance and efficiency of the re-liquefaction line 140 can be improved.

The nitrogen separator 130 may be a membrane filter. The membrane filter has a substance having high affinity with the nitrogen component and the pressurized evaporation gas passes through the membrane filter by the pressure so that the nitrogen component is filtered by the membrane filter and supplied to the first fuel gas supply line 150 And the components other than nitrogen such as methane can be passed through and supplied to the refueling line 140.

The first fuel gas supply line 150 is provided to supply a first gas flow containing the first concentration of nitrogen component separated by the nitrogen separator 130 to the first engine as fuel gas. As described above, the pressurized evaporation gas is passed through the nitrogen separator 130 to produce a first gas stream containing a first concentration of nitrogen component at a relatively high concentration and a second gas stream containing a nitrogen component at a second concentration at a relatively low concentration 2 gas flow, the first fuel gas supply line 150 supplies and uses the first gas flow having a low re-liquefying efficiency as the fuel gas to the first engine and thereby makes efficient use of the fuel gas And the efficiency of re-liquefaction of the second gas flow can be increased at the same time.

The liquefying line 140 is provided to separate and re-liquefy the second gas flow containing the nitrogen component of the second concentration by the nitrogen separator 130. As the nitrogen content in the evaporative gas to be liquefied increases, the re-liquefaction efficiency of the evaporated gas is lowered due to the low boiling point of the nitrogen component. Thus, the re-liquefaction line 140 is formed by the low concentration nitrogen component And the second gas flow containing the second gas flow is supplied to the second gas flow channel, thereby improving the re-liquefaction efficiency of the evaporation gas.

The re-liquefaction line 140 includes a heat exchange unit 141 for exchanging and cooling the second gas flow separated by the nitrogen separator 130, an expansion valve 142 for decompressing the second gas flow passing through the heat exchange unit 141 A gas-liquid separator 143 for receiving a second gas flow that has been depressurized through the expansion valve 142, a liquefied gas recovery line for re-supplying the liquid components separated from the gas-liquid separator 143 to the storage tank 110 And an evaporative gas recovery line 145 for re-supplying the gas components separated in the gas-liquid separator 143 to the storage tank 110 or the evaporation gas supply line 120 side.

The heat exchange unit 141 is arranged to exchange heat between the second gas flow supplied to the re-liquefaction line 140 and the evaporation gas before the compression unit 121 conveyed along the evaporation 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 of the evaporation gas supply line 120, To cool the pressurized second gas flow flowing along line 140. The second gas flow passing through the compression section 121 and the nitrogen separator 130 and being pressurized can be cooled by heat exchange with the low temperature evaporation gas passing through the evaporation gas supply line 120, Unnecessary power supply is prevented from being wasted, facilities are simplified, and facility operation efficiency can be improved.

The expansion valve 142 may be provided at the rear end of the heat exchange unit 141. The expansion valve 142 is further cooled and expanded by depressurizing the pressurized and cooled second gas flow sequentially through the compression section 121, the nitrogen separator 130 and the heat exchange section 141, It can be liquefied. The expansion valve 142 may be, for example, a Joule-Thomson valve.

The gas-liquid separator 143 is provided to separate the liquid component and the gas component of the re-liquefied second gas flow by receiving the re-liquefied second gas flow through the expansion valve 142 while being cooled and decompressed. Although the second gas flow is largely re-liquidized when passing through the expansion valve 142, a gas component may be generated due to flash gas generated during the decompression process. The separated liquid component of the second gas flow passing through the heat exchanger 141 and the expansion valve 142 and supplied to the gas-liquid separator 143 is supplied to the storage tank 110 through the liquefied gas recovery line 144, And the separated gaseous components may be supplied to the storage tank 110 or the evaporation gas supply line 120 by the evaporation gas recovery line 145 to be described later.

The liquefied gas recovery line 144 may be provided between the gas-liquid separator 143 and the storage tank 110 so as to re-supply the liquid component of the evaporated gas separated by the gas-liquid separator 143 to the storage tank 110. The liquefied gas recovery line 144 may be provided in such a manner that its inlet side end communicates with the lower side of the gas-liquid separator 143 and its outlet side end communicates with the inside of the storage tank 110. The liquefied gas recovery line 144 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 evaporation gas recovery line 145 is connected to the gas liquid separator 143 and the storage tank 110 so as to re-supply the gas component of the evaporated gas separated by the gas-liquid separator 143 to the storage tank 110 or the evaporation gas supply line 120 Or between the gas-liquid separator 143 and the evaporation gas supply line 120. 1 shows that the gas component in the gas-liquid separator 143 is supplied again to the upstream side of the compression unit 121 on the evaporation gas supply line 120 in the evaporation gas recovery line 145, To the storage tank 110, or to the evaporation gas supply line 120 and the storage tank 110 together.

The second fuel gas supply line 170 is branched from the intermediate portion of the compression unit 121 of the first fuel gas supply line 150 and is provided to supply the partially pressurized evaporative gas to the second engine or the GCU. The second fuel gas supply line 170 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 170 is larger than the supply amount of the fuel gas required by the second engine, the GCU supplies and consumes some surplus pressurized evaporative gas .

The calorific value adjustment unit 160 is provided to measure and adjust the calorific value of the fuel gas supplied to the first engine.

The heating value means the amount of heat released when the fuel gas of a unit mass is completely burned. Methane, butane, and propane in natural gas have a relatively high calorific value, which increases the calorific value of the fuel gas (the calorific value of methane is about 12,000 kcal / kg, the calorific value of butane is about 11,863 kcal / kg and the calorific value of propane is about 2,000 kcal / kg), whereas the calorific value of nitrogen is very low (calorific value of nitrogen: about 60 kcal / kg). The higher the absolute content or concentration of nitrogen component, the lower the total calorific value of the fuel gas. If the total calorific value of the fuel gas supplied to the engine is too low to meet the minimum calorific value required by the engine, it affects the output of the engine and causes an unnecessary load on the engine.

As described above, in order to raise the liquefaction efficiency of the refueling line 140, the nitrogen gas separator 130 supplies the second gas flow containing the low-concentration nitrogen component of the pressurized gas to the refueling line 140 , The first gas flow is supplied to the first fuel gas supply line 150 and the amount of heat generated by the first gas flow is lower than the amount of heat required by the first engine due to the nitrogen component at a high concentration contained in the first gas flow There is a concern.

Referring to FIG. 1, a calorific value adjustment unit 160 of a fuel gas supply system 100 according to an embodiment of the present invention includes a calorific value measurer 161 for measuring or calculating a calorific value of fuel gas supplied to a first engine, And a heating value raising line 162 for supplying the evaporated gas pressurized by the compression unit 121 to the first fuel gas supply line 150.

The calorific value measuring device 161 can measure the calorific value of the fuel gas including the first gas flow supplied to the first engine to the first fuel gas supply line 150 in real time. The calorific value measuring device 161 transmits the calorific value information of the fuel gas measured by a display unit (not shown) such as a display to notify the occupant of the vessel or transmits calorific value information of the measured fuel gas to a control unit , The control unit compares the conditionally calorific value of the first engine and the calorific value information of the fuel gas transmitted from the calorific value measuring device 161 to determine the opening degree of the flow rate regulating valve 163 provided in the calorific value increasing line 162 Can be controlled.

In FIG. 1, the calorific value measuring device 161 is provided on the first fuel gas supply line 150 to measure the calorific value of the fuel gas. However, if the calorific value of the fuel gas supplied to the first engine can be measured, May be variously modified.

The heating amount rising line 162 may be provided such that the inlet side end portion is connected to the downstream end of the compression portion 121 on the evaporation gas supply line 120 and the outlet side end portion is connected to the first fuel gas supply line 150. The heating amount increase line 162 allows the evaporated gas passed through the compression section 121 to merge into the first gas flow flowing through the first fuel gas supply line 150 without passing through the nitrogen separator 130. Thereby, the concentration of the nitrogen component of the fuel gas composed of the first gas flow supplied to the first engine and the pressurized evaporation gas is lowered, and the concentration of the component having a high calorific value such as methane and butane is increased to increase the total calorific value of the fuel gas .

The heating amount increase line 162 may be provided with a flow rate control valve 163 for adjusting the supply amount of the pressurized evaporation gas flowing along the heating amount increase line 162. The flow regulating valve 163 is automatically controlled by the operator or controlled by the operator based on the calorific value information of the fuel gas measured by the calorific value measuring device 161 and the condition calorific value information of the first engine, The supply amount of the pressurized evaporation gas flowing along the line 162 can be controlled.

2 is a conceptual diagram showing a fuel gas supply system 100 according to another embodiment of the present invention. Referring to FIG. 2, the calorific value adjustment unit 160 of the fuel gas supply system 100 according to another embodiment of the present invention includes a calorific value measuring device 161 for measuring or calculating the calorific value of the fuel gas supplied to the first engine, The first gas flow supplied along the heat generation amount increase line 162 and the first fuel gas supply line 150 for supplying the evaporated gas pressurized by the unit 121 to the first fuel gas supply line 150 is re- And a heating rate adjustment line 164 for circulating the refrigerant to the line 140.

The fuel gas supply system 100 according to another embodiment of the present invention will now be described with reference to the accompanying drawings. It is omitted.

The calorific value measurer 161 can measure the calorific value of the fuel gas including part of the first gas flow supplied to the first engine to the first fuel gas supply line 150 in real time. The calorific value measuring device 161 transmits the calorific value information of the fuel gas measured by a display unit (not shown) such as a display to notify the occupant of the vessel or transmits calorific value information of the measured fuel gas to a control unit The control unit compares the conditional calorific value of the first engine and the calorific value information of the fuel gas transmitted from the calorific value measuring device 161 with reference to the calorific value increase line 162 or the calorific value adjustment line 164 provided in the calorific value adjustment line 164, The opening and closing degree of the flow rate control valves 163 and 165 can be controlled.

In FIG. 2, the calorific value measuring device 161 is provided on the first fuel gas supply line 150 to measure the calorific value of the fuel gas. However, if the calorific value of the fuel gas supplied to the first engine can be measured, May be variously modified.

The heating amount rising line 162 may be provided such that the inlet side end portion is connected to the downstream end of the compression portion 121 on the evaporation gas supply line 120 and the outlet side end portion is connected to the first fuel gas supply line 150. The heating amount increase line 162 allows the evaporated gas passed through the compression section 121 to merge into the first gas flow flowing through the first fuel gas supply line 150 without passing through the nitrogen separator 130. As a result, the concentration of the nitrogen component of the fuel gas supplied to the first engine is lowered, and the concentration of the component having a high calorific value such as methane and butane is raised, thereby raising the total calorific value of the fuel gas.

The heating amount increase line 162 may be provided with a flow rate control valve 163 for adjusting the supply amount of the pressurized evaporation gas flowing along the heating amount increase line 162. The flow regulating valve 163 is automatically controlled by the operator or controlled by the operator based on the calorific value information of the fuel gas measured by the calorific value measuring device 161 and the condition calorific value information of the first engine, The supply amount of the pressurized evaporation gas flowing along the line 162 can be controlled.

The calorific value adjustment line 164 is connected to the front end of the point where the inlet side end portion is connected to the first fuel gas supply line 150 and the heat generation amount rise line 162 joins together and the outlet side end portion is connected to the refueling line 140 As shown in FIG. As described above, the first gas flow contains a nitrogen component at a high concentration, and thus the calorific value is lower than that of the pressurized evaporated gas. Therefore, a part of the first gas flow flowing along the first fuel gas supply line 150 can be circulated to the refueling line 140 side to increase and adjust the total calorific value of the fuel gas supplied to the first engine. At the same time, the calorific value adjustment line 164 recovers a part of the first gas flow to the refueling line 140, so that the pressurized evaporation through the calorific value increase line 162 corresponding to the required supply amount of the fuel gas of the first engine It is possible to prevent an excessive increase of the total supply amount of the fuel gas due to the confluence of the gases and efficiently regulate the supply amount of the fuel gas.

The calorific value adjustment line 164 may be provided with a flow rate regulating valve 165 for regulating the supply amount of a part of the first gas flow flowing along the calorific value adjustment line 164. The flow rate control valve 165 is manually or manually controlled by the operator on the basis of the calorific value information of the fuel gas measured by the calorific value measuring device 161 and the condition calorific value information of the first engine, The amount of the first gas flow that flows along the line 164 can be controlled. Alternatively, although not shown in the figure, the amount of fuel supplied to the first fuel gas supply line 150 or the first engine may be controlled based on the fuel gas supply amount information measured by the flow rate sensing unit (not shown) The degree of opening and closing of the flow control valve 165 may be controlled.

The fuel gas supply system 100 according to the embodiment of the present invention having such a configuration is configured such that the evaporated gas pressurized by the nitrogen separator 130 is supplied to the first gas flow containing the nitrogen component of the first concentration and the second gas flow containing the nitrogen component of the second concentration The second gas flow is classified into a second gas flow containing nitrogen component and the second gas flow is supplied to the re-liquefaction line 140 to re-liquefy, thereby improving the re-liquefaction efficiency of the evaporated gas.

Further, the calorific value adjustment unit 160 measures and regulates the calorific value of the fuel gas, thereby controlling the calorific value of the fuel gas in accordance with the calorific value required by the engine, thereby effectively using and managing the fuel gas.

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: evaporation gas supply line 121: compression section
130: nitrogen separator 140: reflux line
141: heat exchanger 142: expansion valve
143: gas-liquid separator 144: liquefied gas recovery line
145: Evaporative gas recovery line 150: First fuel gas supply line
160: calorific value adjuster 161: calorie calorie meter
162: heat generation increase line 164: heat generation adjustment line
170: second fuel gas supply line

Claims (6)

A storage tank for storing the liquefied gas and the evaporated gas;
An evaporation gas supply line having a compression section for pressurizing the evaporation gas of the storage tank;
A nitrogen separator for separating the pressurized evaporated gas passing through the compression section 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 first fuel gas supply line for supplying the first gas flow to the first engine;
A re-liquefaction line for re-liquefying the second gas flow; And
And a calorific value adjustment unit for measuring and adjusting the calorific value of the fuel gas supplied to the first engine,
The calorific value adjustment unit
A calorific value measuring device for measuring a calorific value of the fuel gas supplied to the first engine,
And a calorific value increase line for directly supplying a part of the evaporated gas that has passed through the compression section and is pressurized to the first fuel gas supply line. The method according to claim 1,
The calorific value adjustment unit
Further comprising a calorific value adjustment line for circulating at least a portion of the first gas flow flowing along the first fuel gas supply line to the refill liquefaction line. 3. The method of claim 2,
The heating value increasing line and the heating value adjusting line
And a flow control valve for controlling the supply amount of the pressurized evaporation gas and the first gas flow flowing along the heating value increasing line and the heating value adjusting line,
Wherein each of the flow rate control valves is controlled in accordance with the calorific value information of the fuel gas measured by the calorific value measuring device. The method of claim 3,
Wherein the nitrogen separator comprises a membrane filter. 5. The method according to any one of claims 1 to 4,
The re-liquefaction line
A heat exchanging unit for exchanging the second gas flow with the evaporation gas at a front end of the compression unit; an expansion valve for reducing the pressure of the second gas flow that has passed through the heat exchanging unit to heat- Liquid separator for separating the gas flow into a gas component and a liquid component, a liquefied gas recovery line for supplying a liquid component of the second gas flow separated in the gas-liquid separator to the storage tank, and a second gas flow And an evaporative gas recovery line for supplying a gas component of the compressed gas to the upstream side of the compression section on the storage tank or the evaporative gas supply line. 6. The method of claim 5,
And a second fuel gas supply line which is branched from a middle portion of the compression section and supplies an evaporated gas pressurized by the compression section to a second engine or a gas combustion unit (GCU).
KR1020150080542A 2015-02-04 2015-06-08 Fuel gas supplying system in ships KR101672196B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020150080542A KR101672196B1 (en) 2015-06-08 2015-06-08 Fuel gas supplying system in ships
CN201680008507.9A CN107848605B (en) 2015-02-04 2016-01-26 Apparatus and method for treating boil-off gas of ship
PCT/KR2016/000818 WO2016126037A1 (en) 2015-02-04 2016-01-26 Apparatus and method for treating boil-off gas of vessel
JP2017557258A JP6498785B2 (en) 2015-02-04 2016-01-26 Ship evaporative gas processing apparatus and processing method
JP2018169653A JP6843099B2 (en) 2015-02-04 2018-09-11 Evaporative gas treatment equipment and treatment method for ships

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