KR100766145B1 - Gas supply system and method for LNG ship - Google Patents

Gas supply system and method for LNG ship Download PDF

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Publication number
KR100766145B1
KR100766145B1 KR1020050100568A KR20050100568A KR100766145B1 KR 100766145 B1 KR100766145 B1 KR 100766145B1 KR 1020050100568 A KR1020050100568 A KR 1020050100568A KR 20050100568 A KR20050100568 A KR 20050100568A KR 100766145 B1 KR100766145 B1 KR 100766145B1
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South Korea
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nitrogen
air
valve
gas supply
high pressure
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KR1020050100568A
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Korean (ko)
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KR20070044541A (en
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권순빈
김남수
홍성일
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대우조선해양 주식회사
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    • 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
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0447—Composition; Humidity
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

본 발명은 액화천연가스 운반선용 가스 공급 시스템 및 방법에 관한 것으로서, 보다 상세하게는 액화천연가스 운반선에서 리 도킹(Re-Docking) 시 카고탱크를 청소하는데 필요한 비활성기체 공급장치와 단열구역에 공급되는 질소가스 공급 장치를 별개로 장착하는데 따른 설치 공간 점유 및 비용 절감을 할 수 있도록 한 것이다.The present invention relates to a gas supply system and method for a liquefied natural gas carrier, and more particularly, is supplied to an inert gas supply device and an insulated zone for cleaning a cargo tank during re-docking in a liquefied natural gas carrier. In order to save installation space and cost by separately installing the nitrogen gas supply device.

본 발명의 목적은, 선박 운항중 항상 사용하는 질소가스 공급장치와 비활성 기체 공급장치를 일체로 제작하여 제작을 단순화함과 아울러 밸브의 조절에 따라 질소가스공급장치 또는 비활성기체공급장치로 변환하여 사용할 수 있도록 함으로써, 제작 경비 절감 및 소요 공간의 절감을 이룰 수 있도록 하고 있는 것이다.The object of the present invention is to simplify the production by integrating the nitrogen gas supply device and the inert gas supply device which is always used during the operation of the vessel, and to convert to the nitrogen gas supply device or inert gas supply device according to the adjustment of the valve. By doing so, it is possible to achieve a reduction in production cost and a space required.

상기한 목적을 실현하기 위하여 본 발명은, 서로 병렬 연결됨과 아울러 제1, 2배출밸브(1, 2)가 각각 연결된 2대의 에어컴프레셔(3)와, 상기한 에어컴프레셔(3)에서 고압 공기를 공급받도록 설치되고 입력 밸브(4, 5)가 연결된 질소발생기(6, 7)와, 상기한 질소발생기(6, 7)에 배출밸브(8, 9)를 통해 연결되고 제3입력밸브(10)가 설치됨과 아울러 카고탱크 및 단열구역으로 감압밸브(11, 11')를 통해 연결된 저장탱크(12)와, 상기한 에어컴프레셔(3)에 제4입력밸브(13)를 통해 고압 공기가 제습기(15)로 입력되고 제5배출밸브(14)가 제3입력밸브(10)의 전에 연결되어 사용목적에 따라서 제습기(15) 또는 질소발생기(6, 7)의 작동 시 질소가스 또는 제습된 고압공기가 저장되는 저장탱크(12)로 구성함을 특징으로 한다.In order to realize the above object, the present invention provides a high-pressure air in the air compressor (3) and the two air compressors (3) connected to each other in parallel and connected to the first and second discharge valves (1, 2), respectively. Nitrogen generators 6 and 7 installed to be supplied and connected with input valves 4 and 5, and third input valves 10 connected to the nitrogen generators 6 and 7 through discharge valves 8 and 9; In addition, the storage tank 12 connected to the cargo tank and the insulated zone through the pressure reducing valves 11 and 11 ', and the high pressure air through the fourth input valve 13 to the air compressor 3 are dehumidified ( 15) and the fifth discharge valve 14 is connected before the third input valve 10 so that nitrogen gas or dehumidified high pressure air is operated when the dehumidifier 15 or the nitrogen generators 6 and 7 are operated according to the purpose of use. It is characterized by consisting of a storage tank 12 is stored.

또한, 본 발명에 따른 가스 공급 방법은, 선박 운항중 질소가스를 단열구역에 공급하기 위해 에어컴프레셔(3)를 작동시킴과 아울러 에어컴프레셔(3)의 공기가 제1, 2질소발생기(6, 7)로 공급되도록 하는 단계와,In addition, the gas supply method according to the present invention, while operating the air compressor (3) to supply nitrogen gas to the adiabatic zone during the ship operation, the air of the air compressor (3) is the first, second nitrogen generator (6, 7) supplying,

상기한 제1,2질소발생기(6,7)에서 발생된 질소가스가 저장탱크(12)와 감압밸브(11,11')를 사용목적에 따라 통과 적절한 압력으로 단열구역 및 카고탱크에 공급하는 단계와,Nitrogen gas generated in the first and second nitrogen generators 6 and 7 passes through the storage tank 12 and the pressure reducing valves 11 and 11 'according to the purpose of use, and supplies them to the thermal insulation zone and the cargo tank at an appropriate pressure. Steps,

상기한 에어컴프레셔(3)에서 발생된 고압공기가 제습기(15)를 통과하면서 수분이 제거되는 단계와,Removing water while the high pressure air generated by the air compressor 3 passes through the dehumidifier 15;

선박의 리도킹시 상기한 제습기(15)를 통과한 제습된 고압공기가 저장탱크(12)에 저장되면 제4입력밸브(13) 및 제5배출밸브(14)를 잠궈서 제1,2질소발생기(6,7) 작동을 멈추게 하는 단계와,If the dehumidified high pressure air passing through the dehumidifier 15 is stored in the storage tank 12 when the vessel is redocked, the fourth input valve 13 and the fifth discharge valve 14 are locked to the first and second nitrogen. Stopping the generator (6,7) operation;

저장된 습도가 낮은 고압공기를 감압밸브(11)를 통과 적절한 압력으로 카고탱크 또는 단열구역에 공급되도록 하는 단계로 구성함을 특징으로 한다.It characterized in that it comprises a step of supplying the high pressure air stored low humidity through the pressure reducing valve 11 to the cargo tank or adiabatic zone at an appropriate pressure.

LNG 운반선용 가스 공급 시스템, 액화천연가스 Gas supply system for LNG carriers, LNG

Description

액화천연가스 운반선용 가스 공급 시스템 및 방법{Gas supply system and method for LNG ship}Gas supply system and method for LNG ships

도1은 본 발명에 따른 액화천연가스(LNG) 운반선용 가스 공급 시스템을 도시한 개략도,1 is a schematic diagram showing a gas supply system for a LNG carrier according to the present invention;

도2는 일반적인 액화천연가스 운반선에서 단열구역에 공급하는 질소가스 공급 장치를 도시한 개략도,Figure 2 is a schematic diagram showing a nitrogen gas supply device for supplying a thermal insulation zone in a typical LNG carrier;

도3은 일반적인 액화천연가스 운반선에서 카고탱크의 청소 시 사용되는 비활성 기체 공급 장치를 도시한 개략도.Figure 3 is a schematic diagram showing an inert gas supply device used for cleaning the cargo tank in a typical LNG carrier.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

1: 제1배출밸브 2: 제2배출밸브1: first discharge valve 2: second discharge valve

3: 에어컴프레셔 4: 제1입력밸브3: air compressor 4: first input valve

5: 제2입력밸브 6: 제1질소발생기5: 2nd input valve 6: 1st nitrogen generator

7: 제2질소발생기 8: 제3배출밸브7: 2nd nitrogen generator 8: 3rd discharge valve

9: 제4배출밸브 10: 제3입력밸브9: 4th discharge valve 10: 3rd input valve

11, 11': 감압밸브 12: 저장탱크11, 11 ': Pressure Reducing Valve 12: Storage Tank

13: 제4입력밸브 14: 제5배출밸브13: 4th input valve 14: 5th discharge valve

15: 제습기15: Dehumidifier

본 발명은 액화천연가스 운반선용 가스 공급 시스템 및 방법에 관한 것으로서, 보다 상세하게는 액화천연가스 운반선에서 리 도킹(Re-Docking) 시 카고탱크를 청소하는데 필요한 비활성기체 공급장치와 단열구역에 공급되는 질소가스 공급 장치를 별개로 장착하는데 따른 설치 공간 점유 및 비용 절감을 할 수 있도록 한 것이다.The present invention relates to a gas supply system and method for a liquefied natural gas carrier, and more particularly, is supplied to an inert gas supply device and an insulated zone for cleaning a cargo tank during re-docking in a liquefied natural gas carrier. In order to save installation space and cost by separately installing the nitrogen gas supply device.

일반적으로, 액화천연가스 즉, LNG(Liquified Petroleum Gas)는 메탄을 주성분으로 하는 천연가스(NG;Natural Gas)를 영하 162℃의 초저온 상태로 냉각하여 그 부피를 대략 1/600정도로 감소시킨 것이다.In general, liquefied natural gas, that is, LNG (Liquified Petroleum Gas) is a natural gas (NG; natural gas) containing methane as the main component is cooled to an extremely low temperature of minus 162 ℃ to reduce the volume to approximately 1/600.

상기한 액화천연가스를 에너지원으로 사용하기 위해서는 액화천연가스(LNG)의 생산기지로부터 수요자까지 대량 이송하는 것이 필요하게 되는 바, 이를 위해 액화천연가스 운반선이 필요하게 된다.In order to use the liquefied natural gas as an energy source, a large amount of liquefied natural gas (LNG) needs to be transported from the production base to the consumer, and for this, a liquefied natural gas carrier is required.

상기한 액화천연가스 운반선에는 극저온 상태인 액화천연가스를 저장하기 위한 카고탱크(LNG를 싣고 다니는 탱크) 및 상기 카고탱크의 외부를 감싸고 있는 단열상자와 같은 단열구역(Cargo Containment System)이 필요하게 되는 바, 상기한 단열구역은 예를 들어, 내측면은 스테인리스 스틸을 사용하고 외부에는 폴리우레탄 폼을 사용하여 보온성능을 극대화시킨 것을 사용하게 된다.The LNG carrier requires an insulation zone such as a cargo tank (a tank carrying LNG) for storing the LNG in a cryogenic state and an insulation box surrounding the outside of the cargo tank. Bar, the heat insulation zone is, for example, the inner surface is to use a stainless steel and the outer polyurethane foam to maximize the insulation performance.

또한, 상기한 단열구역에는 액화천연가스의 온도 유지를 위해 질소(N₂) 가스를 공급하게 되는 바, 상기한 질소가스 공급 장치는 도2에 도시된 바와 같이 병렬 배치된 2개의 에어컴프레셔(50)와, 상기한 에어컴프레셔(50)의 고압 공기가 공급되고 질소가스를 생성하는 질소가스 발생기(51)와, 상기한 질소가스 발생기(51)에서 발생된 질소를 일정량 저장하는 질소 버퍼(52)와, 상기한 에어컴프레셔(50), 질소가스 발생기(51), 질소 버퍼(52)의 사이에는 설치되어 질소가스 및 공기의 유동을 온/오프시키는 밸브(53)로 이루어져 있다.In addition, the adiabatic zone is supplied with nitrogen (N 2) gas to maintain the temperature of the liquefied natural gas, the nitrogen gas supply device is two air compressors 50 arranged in parallel as shown in FIG. And a nitrogen gas generator 51 for supplying the high pressure air of the air compressor 50 and generating nitrogen gas, and a nitrogen buffer 52 for storing a predetermined amount of nitrogen generated in the nitrogen gas generator 51; In addition, the air compressor 50, the nitrogen gas generator 51, the nitrogen buffer 52 is provided between the valve 53 for turning on and off the flow of nitrogen gas and air.

또한, 상기한 액화천연가스 운반선에는 5년마다 정비를 위해 도크(Dock)에 들어가는 리 도킹(Re-Docking) 시 카고탱크의 청소를 위해 사용하는 비활성 기체 공급 장치가 설치되어 있는 바, 이는 도3에 도시된 바와 같이 병렬로 연결된 2개의 블로워(54)와, 상기한 블로워(54)에서 공기를 공급받아 비활성 기체를 생성하는 비활성 기체 발생기(55)와, 상기한 비활성 기체의 온도를 낮추는 냉각기(56)와, 상기한 냉각기(56)를 통과한 비활성 기체의 수분을 제거하는 드라이어(57)로 구성되어 있다.In addition, the liquefied natural gas carrier is provided with an inert gas supply device used for cleaning the cargo tank during re-docking that enters the dock for maintenance every five years. As shown in FIG. 2, two blowers 54 connected in parallel, an inert gas generator 55 that receives air from the blower 54 to generate inert gas, and a cooler that lowers the temperature of the inert gas ( 56 and a dryer 57 for removing moisture of the inert gas that has passed through the cooler 56 described above.

물론, 상기한 각 구성부품들 사이의 유체 이동을 제어하기 위해 다수의 밸브(58)가 설치되어 있게 된다.Of course, a plurality of valves 58 are installed to control fluid movement between the above-described components.

상기한 비활성 기체 공급 장치는 선박의 리도킹시 비활성 기체를 생성하여 카고탱크로 공급함으로써, 카고탱크를 청소하는 역할을 하게 된다.The inert gas supply device serves to clean the cargo tank by generating an inert gas and supplying it to the cargo tank when the ship is redocked.

그러나, 상기한 바와 같이 대략 5년마다 한번씩 사용하는 비활성 기체 공급 장치와, 선박 운항중 항상 사용하는 질소가스 공급 장치를 별도로 제작 및 설치하게 되면, 비교적 부피가 큰 장치를 별개로 설치하는데 따른 공간의 낭비 및 설치 비용의 증가가 발생되는 문제점이 있다.However, if the inert gas supply device used about once every five years and the nitrogen gas supply device which is always used during ship operation are separately manufactured and installed as described above, the space for installing the relatively bulky device separately can be reduced. There is a problem that an increase in waste and installation costs occurs.

즉, 5년에 한번씩밖에 사용하지 않는 비활성기체 공급장치를 많은 비용을 들여 제작하고 설치하게 되면 매우 비효율적일 뿐만 아니라 설치 공간의 낭비가 발생되는 것이다.In other words, if an inert gas supply device that is used only once every five years is manufactured and installed at a high cost, it is not only inefficient, but also waste of installation space.

따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로서, 선박 운항중 항상 사용하는 질소가스 공급장치와 비활성 기체 공급장치를 일체로 제작하여 제작을 단순화함과 아울러 밸브의 조절에 따라 질소가스공급장치 또는 비활성기체공급장치로 변환하여 사용할 수 있도록 함으로써, 제작 경비 절감 및 소요 공간의 절감을 이룰 수 있도록 하고 있는 것이다.Accordingly, an object of the present invention is to solve the above problems, by simplifying the production of the nitrogen gas supply unit and the inert gas supply unit that is always used during the operation of the vessel while simplifying the production and supply of nitrogen gas under the control of the valve By converting into a device or an inert gas supply device, it is possible to reduce the production cost and the space required.

상기한 목적을 실현하기 위하여 본 발명은, 서로 병렬 연결됨과 아울러 제1, 2배출밸브가 각각 연결된 2대의 에어컴프레셔와, 상기한 에어컴프레셔에서 고압 공기를 공급받도록 설치되고 입력 밸브가 연결된 질소발생기와, 상기한 질소발생기에 배출밸브를 통해 연결되고 제3입력밸브가 설치됨과 아울러 카고탱크 및 단열구역으로 감압밸브를 통해 연결된 저장탱크와, 상기한 에어컴프레셔에 제4입력밸브를 통해 고압 공기가 제습기로 입력되고 제5배출밸브가 제3입력밸브의 전에 연결되어 사용목적에 따라서 제습기 또는 질소발생기의 작동 시 질소가스 또는 제습된 고압공기가 저장되는 저장탱크로 구성함을 특징으로 한다.In order to achieve the above object, the present invention provides two air compressors connected in parallel to each other and connected to the first and second discharge valves, a nitrogen generator installed to receive high pressure air from the air compressor, and an input valve connected thereto. The dehumidifier is connected to the nitrogen generator through a discharge valve, and a third input valve is installed, and a storage tank connected to a cargo tank and an adiabatic zone through a pressure reducing valve and a fourth input valve to the air compressor. And a fifth discharge valve is connected before the third input valve, and is configured as a storage tank in which nitrogen gas or dehumidified high pressure air is stored during operation of the dehumidifier or the nitrogen generator according to the purpose of use.

또한, 본 발명에 따른 가스 공급 방법은, 선박 운항중 질소가스를 단열구역에 공급하기 위해 에어컴프레셔를 작동시킴과 아울러 에어컴프레셔의 공기가 제1, 2질소발생기로 공급되도록 하는 단계와,In addition, the gas supply method according to the present invention, the step of operating the air compressor to supply nitrogen gas to the insulation zone during the ship operation and the air of the air compressor to be supplied to the first and second nitrogen generator,

상기한 제1,2질소발생기에서 발생된 질소가스가 저장탱크와 감압밸브를 사용목적에 따라 통과 적절한 압력으로 단열구역 및 카고탱크에 공급하는 단계와,Supplying the nitrogen gas generated in the first and second nitrogen generators to the insulation zone and the cargo tank at an appropriate pressure through the storage tank and the pressure reducing valve according to the purpose of use;

상기한 에어컴프레셔에서 발생된 고압공기가 제습기를 통과하면서 수분이 제거되는 단계와,Removing water while the high pressure air generated by the air compressor passes through the dehumidifier;

선박의 리도킹시 상기한 제습기를 통과한 제습된 고압공기가 저장탱크에 저장되면 제4입력밸브 및 제5배출밸브를 잠궈서 제1,2질소발생기 작동을 멈추게 하는 단계와,Stopping the operation of the first and second nitrogen generators by locking the fourth input valve and the fifth discharge valve when the dehumidified high pressure air passing through the dehumidifier is stored in the storage tank when the vessel is redocked;

저장된 습도가 낮은 고압공기를 감압밸브를 통과 적절한 압력으로 카고탱크 또는 단열구역에 공급되도록 하는 단계로 구성함을 특징으로 한다.It characterized in that it comprises the step of supplying the high pressure air with low humidity stored in the cargo tank or the insulation area at an appropriate pressure through the pressure reducing valve.

도1은 본 발명에 따른 액화천연가스 운반선용 가스 공급 시스템을 도시한 개략도로서, 시스템 용량 100%이고 서로 병렬 연결됨과 아울러 제1, 2배출밸브(1, 2)가 각각 연결된 2대의 에어컴프레셔(3)와, 상기한 에어컴프레셔(3)에서 고압 공기를 공급받도록 설치되고 입력 밸브(4, 5)가 연결된 질소발생기(6, 7)와, 상기한 질소발생기(6, 7)에 배출밸브(8, 9)를 통해 연결되고 제3입력밸브(10)가 설치됨과 아울러 카고탱크 및 단열구역으로 감압밸브(11, 11')를 통해 연결된 저장탱크(12)와, 상기한 에어컴프레셔(3)에 제4입력밸브(13)를 통해 고압 공기가 제습기(15)로 입력되고 제5배출밸브(14)가 제3입력밸브(10)의 전에 연결되어 사용목적에 따라서 제습기(15) 또는 질소발생기(6, 7)의 작동 시 질소가스 또는 제습된 고압공기가 저장되는 저장탱크(12)로 구성되어 있다.Figure 1 is a schematic diagram showing a gas supply system for a liquefied natural gas carrier according to the present invention, the system capacity is 100% and two air compressors connected to each other in parallel with each other and the first and second discharge valves (1, 2) ( 3), nitrogen generators 6 and 7 installed to receive high pressure air from the air compressor 3 and connected to input valves 4 and 5, and discharge valves to the nitrogen generators 6 and 7; 8 and 9 and the storage tank 12 connected to the cargo tank and the insulating section through the pressure reducing valves 11 and 11 'and the third input valve 10 are installed, and the air compressor 3 described above. The high pressure air is input to the dehumidifier 15 through the fourth input valve 13, and the fifth discharge valve 14 is connected to the third input valve 10 before the dehumidifier 15 or the nitrogen generator depending on the purpose of use. It consists of a storage tank (12) in which nitrogen gas or dehumidified high pressure air is stored during operation (6, 7).

상기한 질소발생기(6,7)는 제1, 2입력밸브(4,5)를 통해 에어컴프레셔(3)에 병렬 연결됨과 아울러 제3, 4배출밸브(8,9)를 통해 저장탱크(12)와 병렬 연결되는 2개의 제1, 2질소발생기(6,7)로 분할 설치하게 된다.The nitrogen generators 6 and 7 are connected in parallel to the air compressor 3 through the first and second input valves 4 and 5, and the storage tanks 12 through the third and fourth discharge valves 8 and 9. ) And two first and second nitrogen generators 6 and 7 connected in parallel to each other.

한편, 본 발명은 선박 운항중 질소가스를 단열구역에 공급하기 위해 에어컴프레셔(3)를 작동시킴과 아울러 에어컴프레셔(3)의 공기가 제1, 2질소발생기(6, 7)로 공급되도록 하는 단계와,On the other hand, the present invention is to operate the air compressor (3) to supply the nitrogen gas to the thermal insulation zone during the ship operation and to ensure that the air of the air compressor (3) is supplied to the first, second nitrogen generator (6, 7) Steps,

상기한 제1,2질소발생기(6,7)에서 발생된 질소가스가 저장탱크(12)와 감압밸브(11,11')를 사용목적에 따라 통과 적절한 압력으로 단열구역 및 카고탱크에 공급하는 단계와,Nitrogen gas generated in the first and second nitrogen generators 6 and 7 passes through the storage tank 12 and the pressure reducing valves 11 and 11 'according to the purpose of use, and supplies them to the thermal insulation zone and the cargo tank at an appropriate pressure. Steps,

상기한 에어컴프레셔(3)에서 발생된 고압공기가 제습기(15)를 통과하면서 수분이 제거되는 단계와,Removing water while the high pressure air generated by the air compressor 3 passes through the dehumidifier 15;

선박의 리도킹시 상기한 제습기(15)를 통과한 제습된 고압공기가 저장탱크(12)에 저장되면 제4입력밸브(13) 및 제5배출밸브(14)를 잠궈서 제1,2질소발생기(6,7) 작동을 멈추게 하는 단계와,If the dehumidified high pressure air passing through the dehumidifier 15 is stored in the storage tank 12 when the vessel is redocked, the fourth input valve 13 and the fifth discharge valve 14 are locked to the first and second nitrogen. Stopping the generator (6,7) operation;

저장된 습도가 낮은 고압공기를 감압밸브(11)를 통과 적절한 압력으로 카고탱크 또는 단열구역에 공급되도록 하는 단계로 구성함을 특징으로 하는 액화천연가스 운반선용 가스 공급 방법도 제공하고 있다.Also provided is a gas supply method for a liquefied natural gas carrier ship, characterized in that configured to be supplied to the cargo tank or the insulation area at a suitable pressure through the pressure-reducing valve (11) with low humidity stored.

즉, 상기한 다수의 입력밸브 및 배출밸브를 조절하는 것을 통해 제1, 2질소발생기(6, 7)와 제습기(15)로 인입되는 압축공기의 경로를 제어함과 아울러 저장탱크(12)에 질소가스 또는 제습된 공기를 저장하여 리도킹시 질소가스 또는 제습된 공기를 강한 압력으로 방출하여 종래 비활성기체발생기의 역할을 하도록 구성된 것이다.That is, by controlling the plurality of input valves and discharge valves described above, the path of the compressed air introduced into the first and second nitrogen generators 6 and 7 and the dehumidifier 15 is also controlled. It is configured to store nitrogen gas or dehumidified air and release nitrogen gas or dehumidified air at a strong pressure when redocking to serve as a conventional inert gas generator.

여기서, 상기한 에어컴프레셔(3) 및 질소발생기(6, 7)를 2대 설치한 것은 비상시를 위한 것이고, 특히 질소발생기(6, 7)를 2개로 분할한 것은 질소가스의 필요량에 1대 또는 2대의 질소발생기를 적절하게 사용할 수 있도록 하여 시스템 효율을 향상시킬 수 있도록 하기 위한 것이다.Here, the installation of the two air compressors 3 and the nitrogen generators 6 and 7 described above is for emergency purposes, and the division of the nitrogen generators 6 and 7 into two is one or the required amount of nitrogen gas. This is to improve the system efficiency by allowing two nitrogen generators to be used properly.

상기한 바와 같은 본 발명의 작용 효과를 설명하면 단열구역의 온도 유지를 위해 선박 운항중 질소가스를 단열구역에 공급하기 위해서는, 용량에 따라 에어컴프레셔(3)중 하나 또는 2개를 작동시키게 된다.Referring to the operation and effect of the present invention as described above, in order to supply nitrogen gas to the insulation zone during the ship operation to maintain the temperature of the insulation zone, one or two of the air compressor (3) is operated according to the capacity.

예를 들어, 하나의 에어컴프레셔(3)를 작동시킴과 아울러 제1배출밸브(1)를 개방시키고, 제1, 2입력밸브(4, 5)를 개방시키며, 제3, 4배출밸브(8, 9)와 제3입력밸브(10)를 개방시키게 된다.For example, while operating one air compressor 3, the first discharge valve 1 is opened, the first and second input valves 4 and 5 are opened, and the third and fourth discharge valves 8 are operated. , 9) and the third input valve 10 are opened.

또한, 단열구역으로 연결된 감압밸브(11')를 열고 카고탱크로 연결된 감압밸브(11)를 잠그고, 제4입력밸브(13)와 제5배출밸브(14)를 닫게 된다.In addition, the pressure reducing valve 11 'connected to the adiabatic zone is opened, the pressure reducing valve 11 connected to the cargo tank is closed, and the fourth input valve 13 and the fifth discharge valve 14 are closed.

상기한 바와 같이 밸브를 조절하게 되면 에어컴프레셔(3)에서 발생된 고압 공기가 제1, 2질소발생기(6, 7)로 공급되면서 질소가스가 발생되고, 수분이 제거된 질소가스가 감압밸브(11')를 통해 단열구역으로 공급되면서 단열구역의 누추로 인한 위험성을 제거하게 된다.When the valve is adjusted as described above, nitrogen gas is generated while the high pressure air generated by the air compressor 3 is supplied to the first and second nitrogen generators 6 and 7, and the nitrogen gas from which the water is removed is reduced-pressure valve ( 11 '), which is supplied to the insulation zone, eliminates the risk of leaking in the insulation zone.

상기한 단열구역에 질소가스의 공급이 완료되면 상기한 감압밸브(11')를 닫아서 상기한 질소발생기(6, 7)에서 발생된 질소가스가 제3입력밸브(10)를 통해 저장탱크(12)에 저장된다.When the supply of nitrogen gas to the adiabatic zone is completed, the pressure reducing valve 11 'is closed so that the nitrogen gas generated from the nitrogen generators 6 and 7 is transferred to the storage tank 12 through the third input valve 10. )

저장탱크(12)에 질소가스가 충분히 저장되면 상기한 제3입력밸브(10)를 잠그게 되는 바, 상기한 저장탱크(12)에는 질소가스가 일정 압력으로 충진되어 있는 상태가 됨으로써, 이 상태에서 선박이 운항을 계속하게 된다.When the nitrogen gas is sufficiently stored in the storage tank 12, the third input valve 10 is locked, and the storage tank 12 is filled with nitrogen gas at a constant pressure, thereby Will continue to operate.

여기서, 상기한 액화천연가스 운반선을 리도킹시키게 되면 상기한 카고탱크를 청소하게 되는 바, 상기한 에어컴프레셔(3)를 작동시킴과 아울러 제4입력밸브(13)를 열고 제1, 2입력밸브(4, 5)를 닫는다.In this case, when the liquefied natural gas carrier ship is redocked, the cargo tank is cleaned. The air compressor 3 is operated and the fourth input valve 13 is opened to open the first and second input valves. Close (4, 5).

또한, 상기한 제3, 4배출밸브(8, 9)를 닫고, 제5배출밸브(14)를 개방시킴과 아울러 제3입력밸브(10)를 열고 카고탱크측의 감압밸브(11)를 개방시킴과 아울러 단열구역측의 감압밸브(11')를 닫게 된다.In addition, the third and fourth discharge valves 8 and 9 are closed, the fifth discharge valve 14 is opened, the third input valve 10 is opened, and the pressure reducing valve 11 on the cargo tank side is opened. In addition, the pressure reducing valve 11 'on the side of the insulation zone is closed.

제5배출밸브(14)를 열게 되면 저장탱크(12) 내부에 일정 압력으로 충진되어 있는 질소가스 또는 제습기(15)를 통과한 습도가 낮은 고압공기가 감압밸브(11')를 통해 카고탱크로 공급된다.When the fifth discharge valve 14 is opened, the high pressure air having low humidity passing through the nitrogen gas or the dehumidifier 15 filled in the storage tank 12 at a predetermined pressure into the cargo tank through the pressure reducing valve 11 '. Supplied.

물론, 상기한 에어컴프레셔(3)에서 계속적으로 소정 압력의 공기를 공급하기 때문에, 저장탱크(12)의 질소 또는 제습된 공기가 일정 압력으로 계속 카고탱크로 공급될 수 있게 된다.Of course, since the air compressor 3 continuously supplies air of a predetermined pressure, nitrogen or dehumidified air of the storage tank 12 can be continuously supplied to the cargo tank at a constant pressure.

이상과 같이 본 발명은 2대의 질소발생기로 단열구역에 질소가스를 공급함과 아울러 질소가스를 저장탱크에 저장한 상태에서 선박의 리도킹시 상기 저장탱크에 저장된 질소가스로 카고탱크의 청소등을 하게 됨으로써, 하나의 장치로 종래 질소공급장치 및 비활성기체 공급장치의 역할을 하게 되어 선박에서 가스 공급 장치의 구성을 단순화하고 부피를 줄일 수 있는 잇점이 있는 것이다.As described above, the present invention supplies nitrogen gas to the adiabatic zone with two nitrogen generators and cleans the cargo tank with nitrogen gas stored in the storage tank when the vessel is redocked while the nitrogen gas is stored in the storage tank. By doing so, it is possible to serve as a conventional nitrogen supply device and an inert gas supply device as a single device, thereby simplifying the configuration of the gas supply device in the ship and reducing the volume.

또한, 대략 5년에 한번 사용하는 비활성기체 공급장치를 별도로 설치하지 않아 이로 인한 제작비의 절감을 이룰 수 있는 잇점이 있는 것이다.In addition, there is an advantage that can be achieved by reducing the production cost by not installing a separate inert gas supply device used about once every five years.

Claims (3)

서로 병렬 연결됨과 아울러 제1, 2배출밸브(1, 2)가 각각 연결된 2대의 에어컴프레셔(3)와, 상기한 에어컴프레셔(3)에서 고압 공기를 공급받도록 설치되고 입력 밸브(4, 5)가 연결된 질소발생기(6, 7) 및 제습기(15)와, 상기한 질소발생기(6, 7)에 배출밸브(8, 9)를 통해 연결되고 제3입력밸브(10)가 설치됨과 아울러 카고탱크 및 단열구역으로 감압밸브(11, 11')를 통해 연결된 저장탱크(12)와, 상기한 에어컴프레셔(3)에 제4입력밸브(13)를 통해 고압 공기가 제습기(15)로 입력되고 제5배출밸브(14)가 제3입력밸브(10)의 전에 연결되어 사용목적에 따라서 제습기(15) 또는 질소발생기(6, 7)의 작동 시 질소가스 또는 제습된 고압공기가 저장되는 저장탱크(12)로 구성함을 특징으로 하는 액화천연가스 운반선용 가스 공급 시스템.Two air compressors 3 connected in parallel to each other and connected to the first and second discharge valves 1 and 2, respectively, and are installed to receive high pressure air from the air compressors 3 and the input valves 4 and 5, respectively. Is connected to the nitrogen generator (6, 7) and the dehumidifier (15) and the nitrogen generator (6, 7) through the discharge valve (8, 9) and the third input valve (10) is installed and the cargo tank And the high pressure air is input to the dehumidifier 15 through the storage tank 12 connected to the insulated zone through the pressure reducing valves 11 and 11 'and the fourth input valve 13 to the air compressor 3. The storage tank (5) is connected to the discharge valve (14) before the third input valve (10) to store nitrogen gas or dehumidified high pressure air during operation of the dehumidifier (15) or the nitrogen generator (6, 7) according to the purpose of use ( 12) Gas supply system for liquefied natural gas carrier. 제1항에 있어서,The method of claim 1, 상기한 질소발생기(6,7)는 제1, 2입력밸브(4,5)를 통해 에어컴프레셔(3)에 병렬 연결됨과 아울러 제3, 4배출밸브(8,9)를 통해 저장탱크(12)와 병렬 연결되는 2개의 제1, 2질소발생기(6,7)로 분할 설치함을 특징으로 하는 액화천연가스 운반선용 가스 공급 시스템.The nitrogen generators 6 and 7 are connected in parallel to the air compressor 3 through the first and second input valves 4 and 5, and the storage tanks 12 through the third and fourth discharge valves 8 and 9. The gas supply system for liquefied natural gas carriers, which is divided into two first and second nitrogen generators (6,7) connected in parallel. 선박 운항중 질소가스를 단열구역에 공급하기 위해 에어컴프레셔(3)를 작동시킴과 아울러 에어컴프레셔(3)의 공기가 제1, 2질소발생기(6, 7)로 공급되도록 하는 단계와,Operating the air compressor (3) to supply nitrogen gas to the adiabatic zone while operating the ship, and allowing the air of the air compressor (3) to be supplied to the first and second nitrogen generators (6, 7), 상기한 제1,2질소발생기(6,7)에서 발생된 질소가스가 저장탱크(12)와 감압밸브(11,11')를 사용목적에 따라 통과 적절한 압력으로 단열구역 및 카고탱크에 공급하는 단계와,Nitrogen gas generated in the first and second nitrogen generators 6 and 7 passes through the storage tank 12 and the pressure reducing valves 11 and 11 'according to the purpose of use, and supplies them to the thermal insulation zone and the cargo tank at an appropriate pressure. Steps, 상기한 에어컴프레셔(3)에서 발생된 고압공기가 제습기(15)를 통과하면서 수분이 제거되는 단계와,Removing water while the high pressure air generated by the air compressor 3 passes through the dehumidifier 15; 선박의 리도킹시 상기한 제습기(15)를 통과한 제습된 고압공기가 저장탱크(12)에 저장되면 제4입력밸브(13) 및 제5배출밸브(14)를 잠궈서 제1,2질소발생기(6,7) 작동을 멈추게 하는 단계와,If the dehumidified high pressure air passing through the dehumidifier 15 is stored in the storage tank 12 when the vessel is redocked, the fourth input valve 13 and the fifth discharge valve 14 are locked to the first and second nitrogen. Stopping the generator (6,7) operation; 저장된 습도가 낮은 고압공기를 감압밸브(11)를 통과 적절한 압력으로 카고탱크 또는 단열구역에 공급되도록 하는 단계로 구성함을 특징으로 하는 액화천연가스 운반선용 가스 공급 방법.A method of supplying a gas for a liquefied natural gas carrier, characterized in that it comprises the step of supplying a high pressure air of low humidity stored in the cargo tank or the insulation area at a suitable pressure through the pressure reducing valve (11).
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