KR101511211B1 - LNG storage tank with BOG reduction device - Google Patents

LNG storage tank with BOG reduction device Download PDF

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KR101511211B1
KR101511211B1 KR20130145573A KR20130145573A KR101511211B1 KR 101511211 B1 KR101511211 B1 KR 101511211B1 KR 20130145573 A KR20130145573 A KR 20130145573A KR 20130145573 A KR20130145573 A KR 20130145573A KR 101511211 B1 KR101511211 B1 KR 101511211B1
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South Korea
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lng
storage tank
bog
reducing valve
pressure reducing
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KR20130145573A
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Korean (ko)
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고재우
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대우조선해양 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/016—Preventing slosh

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

Abstract

The present invention relates to an LNG storage tank having a boil off gas (BOG) reduction device. More specifically, the LNG storage tank reduce a pressure of an LNG by a Joule-Thomson effect to enable the LNG to have a reduced temperature using the movement of the LNG due to rolling of the LNG storage tank; thus reducing the generation of the BOG inside the LNG storage tank. According to the present invention, the LNG storage tank includes: a partition arranged to divide a space inside the storage tank to store the LNG into a plurality of divided spaces; and a reduction valve provided to the partition to connect the divided spaces to each other, reducing the pressure of the LNG passed by rolling the storage tank. The temperature of the LNG is reduced when the LNG passes through the reduction valve, and the generation of the BOG inside the storage tank is reduced.

Description

ＢＯＧ 저감장치를 가진 ＬＮＧ 저장탱크{LNG storage tank with BOG reduction device}[0001] LNG storage tank with BOG reduction device [0002]

본 발명은 BOG 저감장치를 가진 LNG 저장탱크에 관한 것으로서, 더욱 구체적으로는 저장탱크의 동요에 의한 LNG의 운동을 이용하여 LNG를 줄-톰슨 효과로 감압하여 온도를 낮춤으로써, 탱크 내의 BOG 발생을 줄일 수 있도록 구성된 BOG 저감장치를 가진 LNG 저장탱크에 관한 것이다.The present invention relates to an LNG storage tank having a BOG reduction device, and more specifically, by reducing the temperature of LNG by reducing the pressure of the LNG by a line-Thomson effect using the movement of LNG by fluctuation of the storage tank, The present invention relates to an LNG storage tank having a BOG abatement apparatus configured to reduce the BOG reduction apparatus.

일반적으로, LNG(Liquefied Natural Gas)는 천연가스를 대략 -163℃로 냉각하여 얻어지는 것으로서, 가스 상태일 때보다 그 부피가 대폭적으로 감소되어 해상을 위한 원거리 운반에 적합하다. 이러한 LNG는 LNGC(LNG Carrier)에 의해 바다를 통해서 육상의 소요처로 운반되는데, LNGC에는 LNG의 극저온에 견딜 수 있는 LNG 저장탱크가 마련된다.Generally, Liquefied Natural Gas (LNG) is obtained by cooling natural gas to approximately -163 ° C, and its volume is considerably reduced compared with that in a gaseous state, which makes it suitable for remote transportation for marine applications. These LNGs are transported by sea to LNGC (LNG Carrier) through the sea. LNGC is equipped with LNG storage tanks that can withstand the extreme temperatures of LNG.

LNG 저장탱크는 LNGC 뿐만 아니라, LNG RV(LNG Regasification Vessel)와 같은 선박이나, LNG FSRU(LNG Floating Storage and Regasification Unit), LNG FPSO(LNG Floating Production Storage and Off-loading) 등과 같은 해양 구조물에도 설치된다. LNG 저장탱크는 단열처리가 되어 있으나, 외부의 열이 LNG에 지속적으로 전달되므로 LNG가 기화되어 증발가스(Boil-Off Gas, 이하, "BOG"라 함)를 발생시키게 된다. 이러한 BOG는 LNG 저장탱크 내의 압력을 증가시키며, 선박의 동요에 따라 LNG의 유동을 가속시켜 구조적인 문제를 일으킬 수 있기 때문에 그 발생을 억제시킬 필요가 있다.LNG storage tanks are installed not only in LNGC but also in offshore structures such as LNG RV (LNG Regasification Vessel), LNG Floating Storage and Regasification Unit (LNG FSRU), LNG Floating Production Storage and Off-loading (LNG FPSO) . Although the LNG storage tank is adiabatically treated, since the external heat is continuously transferred to the LNG, the LNG is vaporized to generate boil-off gas (hereinafter referred to as "BOG"). These BOGs increase the pressure in the LNG storage tank and may cause structural problems by accelerating the flow of LNG in response to the fluctuation of the ship.

LNG 저장탱크 내에서 BOG를 억제시키기 위한 방법으로는 BOG를 LNG 저장탱크의 외부로 배출시켜서 소각시키는 방법, BOG를 LNG 저장탱크의 외부로 배출시켜서 재액화시킨 후 다시 LNG 저장탱크에 저장하는 방법, BOG를 선박의 추진기관에서 연료로서 사용하는 방법, LNG 저장탱크의 내부 압력을 높게 유지함으로써 증발가스의 발생을 억제하는 방법 등이 있다.As a method for suppressing BOG in the LNG storage tank, there are a method of discharging BOG to the outside of the LNG storage tank and incineration, a method of releasing BOG to the outside of the LNG storage tank to re-liquefy and then storing it in the LNG storage tank, A method of using BOG as fuel in a propulsion engine of a ship, and a method of suppressing the generation of evaporation gas by keeping the internal pressure of the LNG storage tank high.

종래에서 LNG 저장탱크의 BOG 억제 방법으로는 한국공개특허 제10-2013-0062006호의 "LNG 증발가스의 재액화 장치 및 방법"이 있다. 이는 액화천연가스(LNG)가 저장되는 저장탱크; 저장탱크에서 발생되어 배출되는 증발가스를 압축시키는 압축기; 저장탱크에서 압축기로 공급되는 증발가스와 압축기를 통해 압축된 후 배출되는 증발가스를 상호 열교환시켜 압축기를 통해 배출되는 증발가스를 냉각시키는 열교환유닛; 및 열교환유닛에서 배출되는 증발가스와 저장탱크에서 공급되는 액화천연가스를 상호 혼합하여 증발가스를 액화시키는 믹싱유닛을 포함한다.Conventionally, as a method for suppressing BOG of an LNG storage tank, there is "apparatus and method for re-liquefying LNG vaporized gas" of Korean Patent Laid-Open No. 10-2013-0062006. A storage tank in which liquefied natural gas (LNG) is stored; A compressor for compressing the evaporated gas generated and discharged from the storage tank; A heat exchange unit for exchanging heat between the evaporation gas supplied to the compressor from the storage tank and the evaporation gas discharged after being compressed through the compressor to cool the evaporation gas discharged through the compressor; And a mixing unit for mixing the evaporated gas discharged from the heat exchange unit and the liquefied natural gas supplied from the storage tank to liquefy the evaporated gas.

그러나, 이와 같은 종래 기술은 BOG의 발생을 능동적으로 억제하는 것이 아니라, 발생되는 BOG를 재액화하여 재저장하도록 함으로써 BOG의 재액화 및 재저장에 필요한 많은 장치와 배관을 필요로 하고, 이로 인해 구조적으로 복잡할 뿐만 아니라, BOG의 재액화에 많은 에너지를 필요로 하는 문제가 있다.However, such a conventional technique does not actively suppress the occurrence of BOG, but re-liquefies and re-stores the generated BOG, so that many devices and pipes necessary for re-liquefaction and restoration of the BOG are required, And there is a problem that much energy is required for re-liquefaction of BOG.

본 발명은 상기한 바와 같은 종래의 문제점을 해결하기 위한 것으로서, LNG 저장탱크의 동요에 의한 LNG의 운동을 줄-톰슨 효과(Joule-Thomson effect)를 이용하여 감압함으로써 온도를 낮추어 LNG 저장탱크 내의 BOG 발생을 억제하도록 하여, 구조적으로 간단하도록 하여 제작 비용을 줄이며, 에너지 사용이 불필요하도록 하여 운영비용을 절감할 수 있는 LNG 저장탱크를 제공하는데 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to reduce the temperature of the LNG due to the fluctuation of the LNG storage tank by using the Joule-Thomson effect, The present invention aims at providing an LNG storage tank that can be structurally simple to reduce the production cost and can reduce the operation cost by making energy use unnecessary.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, LNG 저장탱크에 있어서,According to an aspect of the present invention, there is provided an LNG storage tank,

LNG 저장을 위한 저장탱크 내의 공간을 복수의 분할공간으로 구획하도록 마련되는 격벽; 및A partition wall configured to partition a space in the storage tank for LNG storage into a plurality of divided spaces; And

상기 분할공간을 서로 연결하도록 상기 격벽에 마련되고, 상기 저장탱크의 동요에 의해 통과되는 LNG의 압력을 낮추는 감압밸브를 포함하여,And a pressure reducing valve provided on the partition wall for connecting the divided spaces to each other and lowering the pressure of the LNG passed by the fluctuation of the storage tank,

상기 감압밸브를 통과하며 감압으로 LNG의 온도가 낮아지면서 상기 저장탱크 내의 BOG 발생이 저감되는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크가 제공된다.And the BOG reduction in the storage tank is reduced as the temperature of the LNG is lowered through the pressure reducing valve and reduced.

바람직하게는 상기 격벽은, 상기 저장탱크 내에 상하방향으로 설치되고, 상기 분할공간을 연결시키는 복수의 통과홀이 형성되며, 상기 통과홀 각각에 상기 감압밸브가 설치될 수 있다.Preferably, the partition wall is vertically installed in the storage tank, and a plurality of through holes for connecting the divided spaces are formed, and the pressure reducing valve may be installed in each of the through holes.

바람직하게는 상기 감압밸브는, J-T 밸브로 이루어질 수 있다.Preferably, the pressure reducing valve may be a J-T valve.

바람직하게는 상기 감압밸브는, 상기 LNG가 통과시 가이드날개에 의해 회전하여 감압되는 스테이터(stator)를 가지는 회전형 밸브로 이루어질 수 있다.
Preferably, the pressure reducing valve may be a rotary valve having a stator that is rotated by the guide vane when the LNG passes through the pressure reducing valve.

본 발명의 다른 측면에 따르면 LNG 저장탱크에 있어서,According to another aspect of the present invention, in the LNG storage tank,

저장탱크 내에 격벽으로 구획되는 복수의 분할공간 사이에 감압밸브가 설치되고, A pressure reducing valve is provided between a plurality of divided spaces partitioned by partition walls in the storage tank,

상기 저장탱크의 동요에 의해 LNG가 상기 감압밸브를 통과하여 감압되어 온도가 낮아지면서 상기 저장탱크 내의 BOG의 발생이 감소되는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크가 제공된다.The LNG is reduced by the fluctuation of the storage tank through the pressure reducing valve and the temperature is lowered, so that the occurrence of BOG in the storage tank is reduced, and the LNG storage tank is provided.

본 발명에 따르면, LNG 저장탱크의 동요에 의한 LNG의 운동을 이용하여 LNG를 줄-톰슨 효과(Joule-Thomson effect)로 감압하여 온도를 낮춤으로써, 이로 인해 LNG 저장탱크 내의 BOG 발생을 억제할 수 있다. 이러한 본 발명의 저장탱크는 구조적으로 간단하도록 하여 제작 비용을 크게 높이지 않고 별도의 에너지 사용이 불필요하면서 BOG 발생을 억제할 수 있다. According to the present invention, it is possible to suppress the occurrence of BOG in the LNG storage tank by lowering the temperature of the LNG by reducing the pressure of the LNG to the Joule-Thomson effect using the movement of the LNG by the fluctuation of the LNG storage tank have. The storage tank according to the present invention is structurally simple, so that the production cost is not greatly increased and the use of energy is unnecessary, and BOG generation can be suppressed.

본 발명의 LNG 저장탱크는 BOG 발생량을 감소시킬 수 있어 BOG의 재액화를 위한 시스템 운영비용을 절감할 수 있고, 격벽에 의해 저장탱크 내에서의 LNG의 슬로싱(sloshing)을 줄일 수 있다.The LNG storage tank of the present invention can reduce the amount of BOG generated, thereby reducing the system operation cost for re-liquefaction of the BOG, and reducing the sloshing of the LNG in the storage tank by the partition walls.

도 1은 본 발명의 일 실시예에 따른 BOG 저감장치를 가진 LNG 저장탱크를 개략적으로 도시한 구성도이다.
도 2는 본 발명의 일 실시예에 따른 BOG 저감장치를 가진 LNG 저장탱크의 스테이터를 도시한 사시도이다.
도 3은 본 발명의 다른 실시예에 따른 BOG 저감장치를 가진 LNG 저장탱크를 개략적으로 도시한 구성도이다. 1 is a schematic view showing an LNG storage tank having a BOG reduction device according to an embodiment of the present invention.
2 is a perspective view illustrating a stator of an LNG storage tank having a BOG reduction device according to an embodiment of the present invention.
3 is a schematic view showing an LNG storage tank having a BOG reduction device according to another embodiment of the present invention.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대한 구성 및 작용을 상세히 설명하면 다음과 같다. 또한 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

도 1은 본 발명의 일 실시예에 따른 BOG 저감장치를 가진 LNG 저장탱크를 도시한 구성도이다.FIG. 1 is a block diagram showing an LNG storage tank having a BOG reduction device according to an embodiment of the present invention.

도 1에 도시된 바와 같이, 본 실시예에 따른 BOG(Boil Off Gas) 저감장치를 가진 LNG 저장탱크(100)는 LNG 저장을 위한 저장탱크(110) 내에 복수로 구획된 분할공간(111) 사이에 감압밸브(130)를 마련하고, 저장탱크(110)의 동요에 의해 감압밸브(130)를 통과하는 LNG를 감압시킴으로써 온도를 낮추도록 한다. 1, an LNG storage tank 100 having a boil off gas (BOG) reduction device according to the present embodiment is divided into a plurality of divided spaces 111 in a storage tank 110 for LNG storage And the LNG passing through the pressure reducing valve 130 is depressurized by the fluctuation of the storage tank 110 to lower the temperature.

LNG 저장탱크는 단열재에 화물의 하중이 직접적으로 작용하는지 여부에 따라 독립탱크형(Independent Type)과 멤브레인형(Membrane Type)으로 분류되는데, 본 실시예의 BOG 저감장치는 예를 들어 압력 용기로 제작되는 독립형 저장탱크에 적용되는 것이 바람직하나, 압력 용기가 아닌 독립형 탱크나 멤브레인형 저장탱크에도 적용될 수 있다. The LNG storage tank is classified into an independent type and a membrane type according to whether the load of the cargo directly acts on the heat insulating material. The BOG abatement device of this embodiment is manufactured, for example, from a pressure vessel It is preferably applied to a stand-alone storage tank, but may be applied to a stand-alone tank or a membrane-type storage tank other than a pressure vessel.

이러한 저장탱크(110)는 LNG의 저장을 위하여, LNCC(LNG Carrier) 뿐만 아니라, LNG RV(LNG Regasification Vessel)와 같은 선박이나, LNG FSRU(LNG Floating Storage and Regasification Unit), LNG FPSO(LNG Floating Production Storage and Off-loading) 등과 같은 해양 구조물에도 설치될 수 있고, LNG의 극저온에 견디기 위한 재질 및 구조를 가지며, 단열재에 의해 단열 처리된다. 또한 저장탱크(110) 내에는 내측 공간을 다수로 구획하기 위한 격벽(120)이 마련될 수 있다. 탱크 내 격벽(120)의 설치 방법에는 공지된 기술을 적용할 수 있다. The storage tank 110 may be a vessel such as an LNG regasification vessel or an LNG Floating Storage and Regasification Unit (LNG FSRU), an LNG Floating Production Storage and Off-loading), and it has the material and structure to withstand the cryogenic temperature of LNG and is insulated by insulation. In addition, the storage tank 110 may be provided with a partition 120 for partitioning a plurality of inner spaces. A well-known technique can be applied to the method of installing the partition wall 120 in the tank.

격벽(120)은 본 실시예에서처럼 저장탱크(110) 내에 상하방향으로 설치됨으로써 저장탱크(110) 내의 공간을 다수의 분할공간(111)으로 구획하도록 하는 벌크 헤드(bulk head)로 이루어질 수 있고, 탱크 내의 분할공간(111)을 서로 연결시키는 통과홀(121)이 격벽(120)에 복수로 마련된다. The partition wall 120 may be a bulkhead that is vertically installed in the storage tank 110 to divide the space in the storage tank 110 into a plurality of partition spaces 111 as in the present embodiment, A plurality of through holes 121 are formed in the partition 120 to connect the divided spaces 111 in the tank.

이러한 통과홀(121) 각각에 감압밸브(130)가 설치될 수 있다. 또한 격벽(120)은 본 실시예에서처럼 선체의 폭 방향 또는 길이 방향을 기준으로 저장탱크(110) 내의 중심부에 수직으로 설치될 수 있고, 이로 인해 저장탱크(110) 내에서 분할공간(111)이 선체의 좌현과 우현, 또는 선수와 선미 방향에 대칭을 이루도록 형성될 수 있다.A pressure reducing valve 130 may be installed in each of the through holes 121. The partition wall 120 may be vertically installed in the center of the storage tank 110 with respect to the width direction or the longitudinal direction of the hull as in the present embodiment so that the partition space 111 is formed in the storage tank 110 And may be formed so as to be symmetrical with respect to the port side and the starboard side of the hull, or the bow and stern side direction.

감압밸브(130)는 BOG 저감을 위한 장치로서, 격벽(120)에 분할공간(111)을 서로 연결시키도록 설치되어, 저장탱크(110)의 동요에 의해 LNG가 갑압밸브(130)를 통과하면서 분할공간(111) 사이를 이동하게 된다. 이때 감압밸브(130)는 통과되는 LNG의 압력을 낮추는데, 감압밸브(130)를 통과한 LNG는 감압에 의한 줄-톰슨 효과(Joule-Thomson effect)로 온도를 낮아지게 되며, LNG 온도가 낮아지면서 저장탱크(110) 내의 LNG 기화로 인한 BOG 발생이 저감된다. The decompression valve 130 is a device for reducing the BOG and is provided to connect the divided spaces 111 to the partition 120. When the LNG passes through the sub-valve 130 due to the oscillation of the storage tank 110 And moves between the divided spaces (111). At this time, the pressure reducing valve 130 lowers the pressure of the LNG passing through the reducing valve 130. The LNG passing through the reducing valve 130 is lowered in temperature due to the Joule-Thomson effect due to the reduced pressure, BOG generation due to LNG vaporization in the storage tank 110 is reduced.

감압밸브(130)는 일례로 JT(Joule Thomson) 냉각에 사용되어, 유체를 냉각시키는 J-T(Joule Thomson) 밸브로 이루어질 수 있다. The pressure reducing valve 130 may be, for example, a Joule Thomson (JT) valve that is used in JT (Joule Thomson) cooling to cool the fluid.

도 2에 도시된 바와 같이, 감압밸브(130)는 LNG가 통과될 때 가이드날개(131)에 의해 회전하여 감압되도록 하는 스테이터(stator, 132)를 가지는 회전형 밸브로 이루어질 수 있다. 2, the pressure reducing valve 130 may be a rotatable valve having a stator 132 that is rotated by the guide vane 131 to be depressurized when the LNG is passed therethrough.

스테이터(132)는 격벽(120)의 통과홀(121)에 설치되는 하우징(133) 내에서 LNG의 통과 유로(134) 상에 설치될 수 있고, 선체와 함께 동요하는 저장탱크(110) 내에서 유동하는 LNG가 유로(134)를 통과시, LNG가 가이드날개(131)에 의해 회전하여 통과함으로써 팽창 작용에 의해 고압에서 저압으로 변환되도록 한다. 또한 스테이터(132)는 LNG의 감압을 위하여, LNG가 유입되는 측의 직경이 LNG가 배출되는 측의 직경보다 작도록 형성됨으로써, 대략 꼭지점이 생략된 콘(cone) 형태를 가질 수 있고, 가이드날개(131)가 일측면에 중심으로부터 그 둘레에 다수로 돌출되도록 형성되되, LNG의 회전을 가이드하기 위하여 와류 형태로 형성될 수 있으며, 하우징(133)과 함께 LNG의 극저온에 견디도록 예컨대 스테인레스스틸(SUS)로 이루어질 수 있다.The stator 132 may be installed on the passage 134 of the LNG in the housing 133 provided in the through hole 121 of the partition 120 and may be installed in the storage tank 110, When the flowing LNG passes through the flow path 134, the LNG is rotated and passed by the guide vane 131 to be converted from a high pressure to a low pressure by an expansion action. The stator 132 may have a cone shape in which the substantially LNG inlet side is smaller than the LNG outlet side diameter, (131) is formed on one side thereof so as to protrude a large number around the center thereof, and may be formed in a vortex shape to guide the rotation of the LNG. The housing (133) may be formed of, for example, stainless steel SUS).

하우징(133)은 스테이터(132)의 형상에 상응하는 통과유로(134)가 내측에 형성된다. In the housing 133, a passage 134 corresponding to the shape of the stator 132 is formed on the inner side.

도 1에 도시된 본 실시예의 감압밸브(130)는 격벽(120)에 동일한 방향으로 LNG가 통과되도록 설치됨을 나타내나, 도 3에 도시된 본 발명의 다른 실시예에서와 같이 저장탱크 내 LNG의 양방향 감압을 위하여 격벽(120)에 서로 상이한 방향으로 LNG가 통과할 수 있도록 설치될 수도 있다.
1 shows that the LNG is installed to pass through the partition wall 120 in the same direction as the pressure reducing valve 130 of the present embodiment shown in FIG. The LNG can be installed to pass through the partition 120 in different directions for bi-directional decompression.

이상에서 살펴본 바와 같은 본 실시예들에 따른 BOG 저감장치를 가진 LNG 저장탱크의 작용을 설명하기로 한다.The operation of the LNG storage tank having the BOG reduction device according to the present invention as described above will be described.

선체 동요로 인한 저장탱크(110)의 동요에 의해 저장탱크(110)에 저장된 LNG가 유동하게 됨으로써 격벽(120)에 의해 구획된 분할공간(111) 사이의 홀을 통과하면서 LNG의 이동이 발생하게 된다. 이때 격벽의 홀에는 감압밸브(130)가 마련되어, 갑압밸브를 LNG가 통과함으로써 LNG의 압력 감소를 가져오게 되고, 이러한 압력 변화에 따른 줄-톰슨 효과(Joule-Thomson effect)에 의해 저장탱크(110) 내의 온도를 낮추도록 한다. 이러한 LNG의 온도 저하는 저장탱크(110) 내의 LNG 기화를 억제하여, 탱크 내의 BOG 발생을 저감시킬 수 있다.The LNG stored in the storage tank 110 is caused to flow by the fluctuation of the storage tank 110 due to the hull shaking, thereby causing the movement of the LNG while passing through the holes between the divided spaces 111 partitioned by the partition walls 120 do. At this time, a pressure reducing valve 130 is provided in the hole of the partition wall, and the pressure of the LNG is reduced by passing the LNG through the LVG valve. By the Joule-Thomson effect according to the pressure change, Lt; / RTI > Such lowering of the temperature of the LNG can suppress the LNG vaporization in the storage tank 110, thereby reducing the occurrence of BOG in the tank.

이와 같은 감압밸브(130)는 선체 동요에 의한 저장탱크(110) 내의 LNG 유동(sloshing)을 이용함으로써, 별도의 에너지 사용이 불필요하도록 하다. 따라서 본 실시예는 BOG 발생을 효과적으로 억제할 수 있으면서, BOG 발생 억제나 BOG 재액화를 위한 운영비용을 절감할 수 있고, 구조적으로 간단하여, 제작 비용을 줄일 수 있다.Such a pressure reducing valve 130 uses LNG flow (sloshing) in the storage tank 110 by hull swinging, so that it is unnecessary to use separate energy. Therefore, the present embodiment can effectively suppress the occurrence of BOG, reduce the operating cost for suppressing BOG generation and BOG re-liquefaction, and is structurally simple, thereby reducing manufacturing costs.

또한 본 실시예들에서는 저장탱크(110) 내에 설치된 격벽(120)에 의해 탱크 내의 공간이 구획됨으로써 LNG의 슬로싱(sloshing)을 줄일 수 있어, 슬로싱 충격에 의한 저장탱크 및 선체의 구조적인 문제 발생을 억제할 수 있다.
Also, in the present embodiment, the space in the tank is partitioned by the partition 120 installed in the storage tank 110, so that the sloshing of the LNG can be reduced, and the structural problem of the storage tank and the hull due to the sloshing impact Generation can be suppressed.

본 발명은 실시예에 한정되지 않고, 본 발명의 기술적 요지를 벗어나지 아니하는 범위 내에서 다양하게 수정 또는 변형되어 실시될 수 있음은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 있어서 자명한 것이다.It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. will be.

110 : 저장탱크 111 : 분할공간
120 : 격벽 121 : 통과홀
130 : 감압밸브 131 : 가이드날개
132 : 스테이터 133 : 하우징
134 : 통과유로110: storage tank 111: partition space
120: partition wall 121: through hole
130: Pressure reducing valve 131: Guide blade
132: stator 133: housing
134: Passage passage

Claims (5)

LNG 저장탱크에 있어서,
LNG 저장을 위한 저장탱크 내의 공간을 복수의 분할공간으로 구획하도록 마련되는 격벽; 및
상기 분할공간을 서로 연결하도록 상기 격벽에 마련되고, 상기 저장탱크의 동요에 의해 통과되는 LNG의 압력을 낮추는 감압밸브를 포함하여,
상기 감압밸브를 통과하며 감압으로 LNG의 온도가 낮아지면서 상기 저장탱크 내의 BOG(Boil Off Gas) 발생이 저감되는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크.In the LNG storage tank,
A partition wall configured to partition a space in the storage tank for LNG storage into a plurality of divided spaces; And
And a pressure reducing valve provided on the partition wall for connecting the divided spaces to each other and lowering the pressure of the LNG passed by the fluctuation of the storage tank,
Wherein the boil-off gas in the storage tank is reduced due to the reduced pressure of the LNG passing through the pressure reducing valve. 청구항 1에 있어서,
상기 격벽은, 상기 저장탱크 내에 상하방향으로 설치되고, 상기 분할공간을 연결시키는 복수의 통과홀이 형성되며, 상기 통과홀 각각에 상기 감압밸브가 설치되는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크.The method according to claim 1,
Wherein the partition wall is vertically installed in the storage tank and has a plurality of through holes for connecting the divided spaces, and the pressure reducing valve is installed in each of the through holes. Tank. 청구항 1 또는 청구항 2에 있어서,
상기 감압밸브는, J-T 밸브로 이루어지는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크.The method according to claim 1 or 2,
Wherein the pressure reducing valve is a JT valve. 청구항 1 또는 청구항 2에 있어서,
상기 감압밸브는, 상기 LNG가 통과시 가이드날개에 의해 회전하여 감압되는 스테이터(stator)를 가지는 회전형 밸브로 이루어지는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크.The method according to claim 1 or 2,
Wherein the pressure reducing valve comprises a rotary valve having a stator which is rotated and reduced by a guide vane when the LNG passes through the LNG storage tank. LNG 저장탱크에 있어서,
저장탱크 내에 격벽으로 구획되는 복수의 분할공간 사이에 감압밸브가 설치되고,
상기 저장탱크의 동요에 의해 LNG가 상기 감압밸브를 통과하여 감압되어 온도가 낮아지면서 상기 저장탱크 내의 BOG의 발생이 감소되는 것을 특징으로 하는 BOG 저감장치를 가진 LNG 저장탱크.In the LNG storage tank,
A pressure reducing valve is provided between a plurality of divided spaces partitioned by partition walls in the storage tank,
Wherein the LOG is reduced due to the fluctuation of the storage tank and the temperature is lowered so that the occurrence of BOG in the storage tank is reduced.
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KR20170030781A (en) 2015-09-10 2017-03-20 현대중공업 주식회사 LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same
US11460244B2 (en) 2016-06-30 2022-10-04 Baker Hughes Oilfield Operations Llc System and method for producing liquefied natural gas
KR102690247B1 (en) * 2022-02-18 2024-08-05 국립한국해양대학교산학협력단 apparatus of combination storage for liquefied natural gas and heavy hydro carbon

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KR100972137B1 (en) 2009-12-16 2010-07-28 장용수 Device to prevent sloshing in lng containers by flotage with wings
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Publication number Priority date Publication date Assignee Title
KR20170030781A (en) 2015-09-10 2017-03-20 현대중공업 주식회사 LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same
US11460244B2 (en) 2016-06-30 2022-10-04 Baker Hughes Oilfield Operations Llc System and method for producing liquefied natural gas
KR102690247B1 (en) * 2022-02-18 2024-08-05 국립한국해양대학교산학협력단 apparatus of combination storage for liquefied natural gas and heavy hydro carbon

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