KR20170133985A - Refrigerant Tank Maintenance Method of FLNG Ship - Google Patents
Refrigerant Tank Maintenance Method of FLNG Ship Download PDFInfo
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- KR20170133985A KR20170133985A KR1020160065536A KR20160065536A KR20170133985A KR 20170133985 A KR20170133985 A KR 20170133985A KR 1020160065536 A KR1020160065536 A KR 1020160065536A KR 20160065536 A KR20160065536 A KR 20160065536A KR 20170133985 A KR20170133985 A KR 20170133985A
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- refrigerant
- gas
- tank
- refrigerant tank
- natural gas
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012423 maintenance Methods 0.000 title abstract 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 39
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 25
- 239000001294 propane Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000003345 natural gas Substances 0.000 claims abstract description 18
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001273 butane Substances 0.000 claims abstract description 17
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims abstract description 17
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 3
- 239000002826 coolant Substances 0.000 claims description 31
- 238000005194 fractionation Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 238000003306 harvesting Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000003949 liquefied natural gas Substances 0.000 abstract description 10
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 238000007726 management method Methods 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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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
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
-
- 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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
-
- 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
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0249—Controlling refrigerant inventory, i.e. composition or quantity
- F25J1/025—Details related to the refrigerant production or treatment, e.g. make-up supply from feed gas itself
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/448—Floating hydrocarbon production vessels, e.g. Floating Production Storage and Offloading vessels [FPSO]
-
- 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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
- F17C2227/0348—Water cooling
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/72—Processing device is used off-shore, e.g. on a platform or floating on a ship or barge
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
본 발명은 부유식 채취선의 냉매탱크 관리방법에 관한 것으로서, 특히 냉매탱크를 관리하는 과정 중에 개싱 업(Gassing up)단계(S1c)와 웜 업(Warm up)단계(S2b)에서 분류 처리된 가스를 이용할 수 있도록 구성한 것이다.The present invention relates to a method of managing a refrigerant tank of a floating sampling line, and more particularly, to a method of managing a refrigerant tank in which a gas classified in a gassing up step (S1c) and a warm up step (S2b) So that it can be used.
LNG(Liquefied Natural Gas)나 LPG(Liquefied Petroleum Gas) 등의 액화가스의 소비량이 전 세계적으로 증가하고 있는 추세이다.The consumption of liquefied gas such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) is increasing worldwide.
특히 액화천연가스(Liquefied Natural Gas, 이하 "LNG"라 함)는 연소시 대기오염 물질 배출이 적은 친환경 연료로서 여러 분야에서 사용이 늘어나고 있다.In particular, Liquefied Natural Gas (hereinafter referred to as "LNG") is an eco-friendly fuel with little emission of air pollutants during combustion, and is increasingly used in various fields.
통상적으로 가스전에서 채취한 천연가스는 메탄(CH4), 에탄(C2H6), 프로판(C3H8), 부탄(C4H10), 질소(N2) 등을 주성분으로 하며, 채취한 천연가스는 천연가스액체(NGL)로 추출(Extraction)되고, 이를 에탄(C2H6), 프로판(C3H8), 부탄(C4H10)으로 분류(Fractionation)한 후 응축과정을 통해 부피를 감축시킨 상태로 탱크에 보관한다.The natural gas collected from the gas field is mainly composed of methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), nitrogen (N2) And fractionated into ethane (C2H6), propane (C3H8), and butane (C4H10), and stored in a tank in a reduced volume through a condensation process.
한편, 해저에 위치한 가스전에서 천연가스를 채취하기 위해 최근에 부유식 채취선인 FLNG, FSRU, FPSO 등이 건조되며, 처리된 액화천연가스를 육상으로 운송하기 위한 캐리어선 등이 개발 건조되고 있다.On the other hand, FLNG, FSRU, FPSO, etc., which are floating collecting vessels, have been recently constructed to collect natural gas from the submarine gas field, and carrier lines have been developed and transported for transporting processed liquefied natural gas to the land.
이와 같이 해상 가스전에서 채취된 천연가스를 액화천연가스로 분류하기 위해서는 분류된 천연가스를 액화하기 위한 액화공정이 필요하며, 액화공정에서 냉매는 반드시 필요하다.In order to classify the natural gas collected from the marine gas field into liquefied natural gas, a liquefaction process for liquefying the natural gas is required, and a refrigerant is necessarily required in the liquefaction process.
이런 냉매를 보관하는 탱크가 냉매탱크이며, 냉매탱크의 관리 시에 사용되는 유체는 냉매탱크에 저장하는 물질에 따라 다르게 된다.The tank for storing such refrigerant is a refrigerant tank, and the fluid used in managing the refrigerant tank differs depending on the substance stored in the refrigerant tank.
따라서 냉매탱크에 저장되는 물질에 따라 다른 유체를 저장 보관하고 있어야 함에 따라 부유식 채취선의 탑 사이드(Top Side)에는 추가적인 장비가 증가하게 되며, 그에 따른 공간활용도가 떨어지는 문제점이 있다.Therefore, since different fluids must be stored and stored according to the substances stored in the coolant tank, additional equipment is increased in the top side of the float type collecting line, and the space utilization is accordingly lowered.
본 발명은 앞에서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 발명된 것으로서, 부유식 채취선의 탑 사이드(Top Side)로 통과하는 액화천연가스, 에탄, 프로판, 부탄 중 어느 한 유체를 분기하여 냉매탱크의 전처리와 후처리 단계에 속하는 개싱 업(Gassing up)단계(S1c)와 웜 업(Warm up)단계(S2b)의 관리 유체로 이용할 수 있도록 구성한 부유식 채취선의 냉매탱크 관리방법을 제공하는 데 그 목적이 있다.Disclosure of the Invention The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method for separating liquefied natural gas, ethane, propane and butane, which flows through a top side of a floating type collecting line, A method of managing a refrigerant tank of a floating harvesting line configured to be used as a management fluid for a gassing up step (S1c) and a warm up step (S2b) belonging to a pre-treatment and post-treatment step of There is a purpose.
상기와 같은 목적을 달성하기 위한 본 발명은 분류된 탄화수소를 액화하기 위한 냉매를 보관하는 부유식 채취선의 냉매탱크 관리방법으로서, 냉매탱크의 내부를 불활성가스에서 냉매가스로 치환하는 개싱 업단계와 냉매탱크의 내부를 상온의 냉매가스로 치환하는 웜 업단계에서 냉매탱크로 공급되는 유체는 추출된 천연가스액체(NGL), 에탄(C2H6), 프로판(C3H8), 부탄(C4H10) 중 어느 하나인 것을 기술적 특징으로 한다.According to another aspect of the present invention, there is provided a method for managing a refrigerant tank in a floating harvesting line for storing refrigerant for liquefying classified hydrocarbons, the method comprising: a gas-tightening step of replacing the inside of the refrigerant tank with a refrigerant gas; The fluid supplied to the coolant tank in the warm-up stage for replacing the inside of the tank with the coolant gas at room temperature is any one of the extracted natural gas liquid (NGL), ethane (C2H6), propane (C3H8), and butane It is a technical feature.
또한, 본 발명의 바람직한 실시예에 따르면, 추출장치에서 분류장치로 이송되는 천연가스액체(NGL)를 분기하여 냉매탱크로 공급한다.Further, according to a preferred embodiment of the present invention, the natural gas liquid (NGL) transferred from the extracting device to the sorter is branched and supplied to the refrigerant tank.
또한, 본 발명의 바람직한 실시예에 따르면, 추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 에탄(C2H6)은 분류장치 중 에탄(C2H6) 분류장치에서 분기하여 냉매탱크로 공급한다.Further, according to a preferred embodiment of the present invention, the natural gas liquid supplied from the extraction device to the fractionation device is classified into a separate liquid gas by carbon number, and the ethane (C2H6) is branched from the ethane (C2H6) To the refrigerant tank.
또한, 본 발명의 바람직한 실시예에 따르면, 추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 프로판(C3H8)은 분류장치 중 프로판(C3H8) 분류장치에서 분기하여 냉매탱크로 공급한다.Further, according to a preferred embodiment of the present invention, the natural gas liquid supplied from the extraction device to the fractionation device is classified into a separate liquid gas by carbon number, and propane (C3H8) is branched from the propane (C3H8) To the refrigerant tank.
또한, 본 발명의 바람직한 실시예에 따르면, 추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 부탄(C4H10)은 분류장치 중 부탄(C4H10) 분류장치에서 분기하여 냉매탱크로 공급한다.According to a preferred embodiment of the present invention, the natural gas liquid supplied from the extraction device to the fractionation device is classified into a separate liquid gas by carbon number, and butane (C4H10) is branched from a C4 To the refrigerant tank.
앞서 설명한 바와 같이, 본 발명에 따른 부유식 채취선의 냉매탱크 관리방법은 냉매탱크의 관리에 필요한 유체를 추출한 액화천연가스 또는 분류처리된 에탄, 프로판, 부탄 중 어느 한 유체를 이용함에 따라 종래에 냉매탱크의 관리에 필요한 유체를 보관 처리하는 장치들이 필요치 않다는 장점이 있다. As described above, the method for managing the refrigerant tank of the floating harvesting line according to the present invention uses the liquid natural gas extracted from the fluid necessary for the management of the refrigerant tank, or the classified ethane, propane and butane, There is an advantage in that there is no need to store the fluid necessary for tank management.
따라서 선박의 건조 단가 및 보관 처리 장치들이 설치되었던 탑 사이드의 공간활용도를 증대시킬 수 있다는 장점이 있다.Therefore, there is an advantage that the space utilization of the top side where the drying unit price of the ship and the storage apparatus are installed can be increased.
도 1은 냉매탱크의 일반적인 관리방법을 나타낸 개념도이고,
도 2는 본 발명의 냉매탱크 관리방법에 따른 필요 유체 공급방식을 나타낸 개념도이며,
도 3은 도 2에 도시된 냉매탱크 관리방법 중 개싱 업단계와 웜 업단계에 필요 유체 공급단계를 나타낸 개념도이다.1 is a conceptual view showing a general management method of a coolant tank,
2 is a conceptual diagram showing a necessary fluid supply system according to the coolant tank management method of the present invention,
FIG. 3 is a conceptual diagram illustrating a necessary fluid supply step in a gas-up step and a warm-up step in the coolant tank management method shown in FIG.
아래에서는 본 발명에 따른 부유식 채취선의 냉매탱크 관리방법의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for managing a refrigerant tank of a floating harvesting line according to the present invention will be described in detail with reference to the accompanying drawings.
도면에서, 도 1은 냉매탱크의 일반적인 관리방법을 나타낸 개념도이고, 도 2는 본 발명의 냉매탱크 관리방법에 따른 필요 유체 공급방식을 나타낸 개념도이며, 도 3은 도 2에 도시된 냉매탱크 관리방법 중 개싱 업단계와 웜 업단계에 필요 유체 공급단계를 나타낸 개념도이다.2 is a conceptual view showing a necessary fluid supply system according to the coolant tank management method of the present invention. FIG. 3 is a schematic view showing a coolant tank management method FIG. 3 is a conceptual diagram showing a supply step of the fluid necessary for the gas-up step and the warm-up step.
도 1에 도시된 바와 같이, 본 발명에 따른 냉매탱크 관리방법은 냉매탱크를 점검하는 관리단계(Sm)와 냉매탱크에 채워진 냉매로 작동하는 가동단계(So)를 포함하며, 가동단계(So) 전에 전처리단계(S1)와 가동단계(So) 이후의 후처리단계(S2)를 포함한다.1, a method of managing a coolant tank according to the present invention includes a management step (Sm) for checking a coolant tank and an operation step (So) operating as a coolant filled in a coolant tank, And includes a pre-processing step (S1) and a post-processing step (S2) after the operating step (So).
먼저 전처리단계(S1)는 관리단계(Sm) 이후에 드라잉(Drying)단계(S1a), 인너팅(Inerting)단계(S1b), 개싱 업(Gassing up)단계(S1c), 쿨 다운(Cool down)단계(S1d), 로딩(Loading)단계(S1e)를 포함하며, 후처리단계(S2)는 가동단계(So) 이후에 트랜스퍼(Transfer)단계(S2a), 웜 업(Warm up)단계(S2b), 개스 프링(Gas freeing)단계(S2c), 에어레이션(Aeration)단계(S2d)를 포함한다.First, the preprocessing step S1 includes a drying step S1a, an ingening step S1b, a gassing up step S1c, and a cooling down process S1c after the management step Sm. ) Step S1d and a loading step S1e. The post-processing step S2 includes a transfer step S2a, a warm-up step S2b A gas freeing step S2c, and an aeration step S2d.
여기에서, 드라잉단계(S1a)는 냉매탱크 내부의 수분을 제거하는 공정으로서, 쿨 다운(Cool down)단계(S1d)에서 아이스(ice)와 부식물질 생성을 방지하고, 듀 포인트(Dew point)를 만족시키기 위한 단계이며, 건조 공기(Dry air)를 공급하여 냉매탱크 내부의 에어를 배출하는 단계이다.Here, the drying step S1a is a step of removing moisture inside the coolant tank. In the cool down step S1d, ice and corrosive substances are prevented from being generated, and a dew point is generated. And is a step for discharging air inside the coolant tank by supplying dry air.
다음으로 인너팅(Inerting)단계(S1b)는 냉매탱크 내부의 산소를 제거하기 위한 공정으로서, 산소의 농도를 낮춰 화재 폭발을 방지하기 위해 불활성가스(질소 또는 이산화탄소)를 공급한다.Next, the Inerting step (S1b) is a process for removing oxygen in the refrigerant tank. The inert gas (nitrogen or carbon dioxide) is supplied to lower the concentration of oxygen to prevent a fire explosion.
그리고 개싱 업(Gassing up)단계(S1c)는 냉매탱크 내부의 불활성가스를 냉매가스로 치환하는 과정으로서, 쿨 다운(Cool down) 시 이산화탄소가 동결되어 하이드래이트(hydrate) 발생을 방지하기 위한 과정이며, 종래에는 냉매를 기화하여 상온의 냉매가스를 탱크에 공급하였으나, 본 발명에서는 채취된 천연가스로부터 추출된 천연가스액체(NGL) 또는 분류된 에탄(C2H6), 프로판(C3H8) 또는 부탄(C4H10)을 냉매탱크에 공급하여 개싱 업단계(S1c)를 수행한다. 이때 개싱 업단계(S1c)를 통해 냉매탱크 내부의 불활성 가스는 배출된다. The gassing up step S1c is a process of replacing the inert gas in the coolant tank with the refrigerant gas and is a process for preventing the generation of hydrate by freezing the carbon dioxide during the cooling down (NGL) or classified ethane (C 2 H 6), propane (C 3 H 8), or butane (C 4 H 10) extracted from natural gas collected in the present invention, Is supplied to the coolant tank to perform the gas-up step (S1c). At this time, the inert gas in the coolant tank is discharged through the gas-up step S1c.
다음으로 쿨 다운(Cool down)단계(S1d)는 냉매탱크의 내부를 냉각시키기 위해 냉매를 분무하는 단계로서, 냉매의 증발잠열을 이용하여 냉매탱크의 내부를 냉각시킨다.Next, the cooling down step S1d is a step of spraying the coolant to cool the inside of the coolant tank, and uses the latent heat of evaporation of the coolant to cool the inside of the coolant tank.
이와 같이 냉매탱크가 냉각되면 다음으로 냉매의 로딩(Loading)단계(S1e)가 수행되며, 각 냉매탱크에 천연가스에서 분류된 에탄(C2H6), 프로판(C3H8), 부탄(C4H10)을 각 냉매탱크에 저장한다.When the refrigerant tank is cooled as described above, a loading step (S1e) of the refrigerant is performed next. Ethane (C2H6), propane (C3H8), and butane (C4H10) classified in natural gas are supplied to the respective refrigerant tanks .
냉매의 로딩이 완료되면 가동단계(So)를 수행하면서, 에탄(C2H6), 프로판(C3H8), 부탄(C4H10)을 냉매로 액화공정이 진행된다.When the loading of the refrigerant is completed, the process of liquefying ethane (C2H6), propane (C3H8), and butane (C4H10) with refrigerant proceeds while performing the operation step (So).
한편, 가동단계(So)가 완료되면, 냉매탱크의 관리를 위해 냉매탱크의 후처리단계(S2)가 진행된다.On the other hand, when the operation step So is completed, the post-treatment step S2 of the coolant tank is performed for the management of the coolant tank.
후처리 과정으로서 트랜스퍼(Transfer)단계(S2a)는 냉매탱크의 냉매를 이송하는 단계로서, 관리하고자 하는 냉매탱크의 냉매를 관리하지 않는 다른 냉매탱크로 이동시켜 비운다.As a post-process, the transfer step S2a is a step of transferring the refrigerant in the coolant tank, and the coolant in the coolant tank to be managed is moved to another coolant tank that is not managed and emptied.
다음으로 웜 업(Warm up)단계(S2b)를 통해 빈 냉매탱크를 상온의 냉매가스로 치환한다. 웜 업단계(S2b)는 쿨 다운(Cool down)단계(S1d)의 반대의 운전으로 종래에는 냉매를 히터로 가열 및 기화하여 냉매탱크 내부로 순환시켜 잔류 냉매를 증발시켰으나, 본 발명에서는 추출된 천연가스액체(NGL) 또는 분류된 에탄(C2H6), 프로판(C3H8) 또는 부탄(C4H10)을 냉매탱크에 공급하여 잔류 냉매를 증발시켜 배출한다.Next, the empty refrigerant tank is replaced with the refrigerant gas at room temperature through a warm-up step (S2b). In the warm-up step S2b, in contrast to the cooling down step S1d, the refrigerant is conventionally heated and vaporized by a heater to circulate the refrigerant into the refrigerant tank to evaporate the residual refrigerant. In the present invention, Gas liquid (NGL) or fractionated ethane (C2H6), propane (C3H8) or butane (C4H10) is supplied to the refrigerant tank to evaporate and discharge the residual refrigerant.
그리고 냉매탱크의 내부에 불활성 가스로 치환하는 개스 프링(Gas freeing)단계(S2c)를 수행하여 냉매가스를 완전히 제거한다.Then, a gas freeing step (S2c) for replacing the inside of the coolant tank with an inert gas is performed to completely remove the refrigerant gas.
냉매탱크에서 냉매가스가 완전히 제거되면, 작업자가 냉매탱크의 내부로 진입할 수 있는 조건을 형성하기 위해 냉매탱크에 에어를 공급하는 에어레이션(Aeration)단계(S2d)가 진행되고, 이후 작업자가 냉매탱크의 상태를 점검 및 보수를 수행하는 관리단계(Sm)가 진행된다.When the refrigerant gas is completely removed from the refrigerant tank, an aeration step (S2d) for supplying air to the refrigerant tank is performed in order to form a condition for the operator to enter the inside of the refrigerant tank, And a management step (Sm) for performing a check and a repair of the state of the server.
앞서 설명한 바와 같이, 본 발명에서는 개싱 업(Gassing up)단계(S1c)와 웜 업(Warm up)단계(S2b)에서 추출된 천연가스액체(NGL) 또는 분류된 에탄(C2H6), 프로판(C3H8) 또는 부탄(C4H10)을 이용하는 것에 특징이 있으며, 이를 위해서 도 2에 도시된 바와 같이 천연가스액체 추출장치(110) 또는 분류된 에탄(C2H6), 프로판(C3H8) 또는 부탄(C4H10)의 분류장치(120)로부터 유체들을 각각 분기시켜 냉매탱크(130)로 공급한다.As described above, in the present invention, the natural gas liquid (NGL) or the classified ethane (C2H6), propane (C3H8) extracted in the gasing up step S1c and the warm up step S2b, (C 2 H 6), propane (C 3 H 8), or butane (C 4 H 10), as shown in FIG. 2, 120 to the
이와 같이 본 발명에서는 천연가스에서 추출된 에탄(C2H6), 프로판(C3H8), 부탄(C4H10)을 냉매탱크의 개싱 업(Gassing up)과 웜 업(Warm up) 과정에 필요한 유체로 이용함으로써, 종래와 같이 에탄(C2H6), 프로판(C3H8), 부탄(C4H10) 등을 기화시키기 위한 별도의 장치가 필요치 않으며 선체의 탑 사이드의 공간활용도를 증대시킬 수 있다.As described above, in the present invention, ethane (C2H6), propane (C3H8), and butane (C4H10) extracted from natural gas are used as fluids for gassing up and warm- There is no need for a separate device for vaporizing ethane (C2H6), propane (C3H8), butane (C4H10), etc., and the space utilization of the top side of the hull can be increased.
110 : 추출장치
120 : 분류장치
130 : 냉매탱크110: Extraction device
120: Classifier
130: Refrigerant tank
Claims (5)
냉매탱크의 내부를 불활성가스에서 냉매가스로 치환하는 개싱 업단계와 냉매탱크의 내부를 상온의 냉매가스로 치환하는 웜 업단계에서 냉매탱크로 공급되는 유체는 추출된 천연가스액체(NGL), 에탄(C2H6), 프로판(C3H8), 부탄(C4H10) 중 어느 하나인 것을 특징으로 하는 부유식 채취선의 냉매탱크 관리방법.
CLAIMS 1. A method for managing a refrigerant tank in a floating harvest line storing a refrigerant for liquefying classified hydrocarbons,
A gasifying step of replacing the interior of the refrigerant tank with a refrigerant gas in an inert gas and a fluid supplied to the refrigerant tank in a warm-up step of replacing the inside of the refrigerant tank with the refrigerant gas at room temperature, (C2H6), propane (C3H8), and butane (C4H10).
추출장치에서 분류장치로 이송되는 천연가스액체(NGL)를 분기하여 냉매탱크로 공급하는 것을 특징으로 하는 부유식 채취선의 냉매탱크 관리방법.
The method according to claim 1,
Wherein the natural gas liquid (NGL) fed from the extraction device to the sorting device is branched and supplied to the refrigerant tank.
추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 에탄(C2H6)은 분류장치 중 에탄(C2H6) 분류장치에서 분기하여 냉매탱크로 공급하는 것을 특징으로 하는 부유식 채취선의 냉매탱크 관리방법.
3. The method according to claim 1 or 2,
Characterized in that the natural gas liquid fed to the fractionator from the extraction device is classified as a separate liquid gas by carbon number and the ethane (C2H6) is branched from the ethane (C2H6) fractionator of the fractionator and fed to the coolant tank How to manage the refrigerant tank of the harvesting line.
추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 프로판(C3H8)은 분류장치 중 프로판(C3H8) 분류장치에서 분기하여 냉매탱크로 공급하는 것을 특징으로 하는 부유식 채취선의 냉매탱크 관리방법.
3. The method according to claim 1 or 2,
Characterized in that the natural gas liquid fed from the extraction device to the fractionation device is classified as a separate liquid gas by carbon number and propane (C3H8) is branched from the propane (C3H8) fractionation device of the fractionation device and fed to the coolant tank How to manage the refrigerant tank of the harvesting line.
추출장치에서 분류장치로 공급된 천연가스액체는 탄소수별 별도의 액체가스로 분류되며, 부탄(C4H10)은 분류장치 중 부탄(C4H10) 분류장치에서 분기하여 냉매탱크로 공급하는 것을 특징으로 하는 부유식 채취선의 냉매탱크 관리방법.3. The method according to claim 1 or 2,
Characterized in that the natural gas liquid supplied from the extraction device to the fractionation device is classified as a separate liquid gas by carbon number and the butane (C4H10) is branched from the butane C4H10 fractionation device of the fractionation device and supplied to the coolant tank How to manage the refrigerant tank of the harvesting line.
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| KR20130088141A (en) * | 2010-06-30 | 2013-08-07 | 쉘 인터내셔날 리써취 마트샤피지 비.브이. | Method of treating a hydrocarbon stream comprising methane, and an apparatus therefor |
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| KR20100110090A (en) * | 2009-04-02 | 2010-10-12 | 대우조선해양 주식회사 | Replacement apparatus of a liquefied gas storage tank using nitrogen |
| KR20130088141A (en) * | 2010-06-30 | 2013-08-07 | 쉘 인터내셔날 리써취 마트샤피지 비.브이. | Method of treating a hydrocarbon stream comprising methane, and an apparatus therefor |
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