KR20090055529A - Nonfreezing water pumping system for preventing lng sloshing in the cargo container of lng ship - Google Patents

Nonfreezing water pumping system for preventing lng sloshing in the cargo container of lng ship Download PDF

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KR20090055529A
KR20090055529A KR1020090033785A KR20090033785A KR20090055529A KR 20090055529 A KR20090055529 A KR 20090055529A KR 1020090033785 A KR1020090033785 A KR 1020090033785A KR 20090033785 A KR20090033785 A KR 20090033785A KR 20090055529 A KR20090055529 A KR 20090055529A
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valve
lng
water
pipe
cargo hold
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KR1020090033785A
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Korean (ko)
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KR100921507B1 (en
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장용수
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장용수
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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
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • 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

A nonfreezing water pumping system for preventing LNG sloshing in a cargo container of an LNG ship to prevent resonance and hydroelasticity by injecting water or tide. A nonfreezing water pumping system for preventing LNG sloshing in a cargo container of an LNG ship comprises a container(103), a first valve(201), a sensor(130) and a water floating pumping unit. The container is connected from a LNG cargo space(100) and the LNG ship to outside. The first valve is opened and closed according to the pressure of the gas vaporized in the LNG cargo space. The sensor senses the highest point signal and the lowest point signal of the LNG surface. The water floating pumping unit injects the water inside the container according to the signal generated from the sensor.

Description

액화천연가스 선박의 화물창내 액화천연가스의 슬로싱을 방지하기 위한 물부동펌핑장치{NONFREEZING WATER PUMPING SYSTEM FOR PREVENTING LNG SLOSHING IN THE CARGO CONTAINER OF LNG SHIP}NONFREEZING WATER PUMPING SYSTEM FOR PREVENTING LNG SLOSHING IN THE CARGO CONTAINER OF LNG SHIP} To prevent sloshing of liquefied natural gas in cargo hold of LNG tank

본 발명은 액화천연가스(LNG)의 슬로싱을 방지하기 위한 물부동펌핑장치에 관한 것으로서, 보다 상세하게는 슬로싱 현상 및 LNG소모 현상을 해소하기 위하여 일반 물 또는 바닷물을 LNG 화물창내로 투입시켜 얼음으로 변환 후, 비중이 높은 얼음이 화물창내에 가라앉으면 LNG를 최저점 이상으로 유지시켜 출렁거림 현상을 방지시키는 LNG선박의 화물창내 LNG의 슬로싱을 방지하기 위한 물부동펌핑장치에 대한 것이다.The present invention relates to a water floating pumping device for preventing sloshing of liquefied natural gas (LNG), and more particularly, in order to solve the sloshing phenomenon and the LNG consumption phenomenon by putting general water or sea water into the LNG cargo hold ice After the conversion, the high specific gravity ice sinks in the cargo hold and the water float pumping device for preventing the sloshing of LNG in the cargo hold of the LNG ship to keep the LNG above the lowest point to prevent a slump.

일반적으로 선박이 고체 또는 액체 화물을 이송할 경우 고체 화물은 무게 중심이 안정되어 화물로 인한 선박의 요동이 없고 비교적 처리하기가 쉬워 안전한 운항을 할 수 있으나, 액체 화물을 이런 경우 어려운 점이 많이 발생했다.In general, when a ship transports a solid or liquid cargo, the solid cargo has a stable center of gravity, so that there is no fluctuation of the ship due to the cargo and it is relatively easy to handle, so that the safe operation can be performed. .

특히 액체 화물 중 -162도를 유지해야하는 LNG와 같은 특이 화물은 외부온도의 영향을 상당히 받으므로 인해 운항 시간이 길어질수록 LNG 화물창 내에 20~30%의 증발가스 공간이 생겨 액상의 LNG를 화물창 내에서 움직이지 못하도록 고정시키 기는 어려운 것이 현실이다.Particularly cargoes such as LNG, which have to maintain -162 degrees among liquid cargos, are significantly affected by the external temperature, so that the longer the operating time, the more 20 to 30% of the boil-off gas space is created in the LNG cargo hold. The reality is that it is difficult to fix it.

즉 LNG 선박이 바람이나 파도에 의해 주기적으로 진동할 경우 선박 화물창 내에 유탄성이 발생되어 화물창의 강도가 약해질 수 있고 특히 주기적인 진동과 선박 화물창 내부의 슬로싱(sloshing)의 진동이 같아졌을 경우 공진현상이 발생하여 화물창이 파손될 수도 있다.In other words, if the LNG vessel is periodically vibrated by wind or waves, the elasticity of the cargo hold may be weakened in the cargo hold, especially when the periodic vibration is equal to the sloshing of the sloshing inside the cargo hold. Resonance may occur and the cargo hold may be damaged.

따라서 LNG 선박과 같이 안정성과 신뢰성이 요구되는 환경에서의 슬로싱 등을 방지할 수 있는 구조를 가진 선박의 개발이 해당 업무 종사자들의 큰 관심사가 되고 있다.Therefore, development of a vessel having a structure that can prevent sloshing in an environment requiring stability and reliability, such as an LNG vessel, has become a big concern for the relevant workers.

본 발명에 따른 LNG의 슬로싱을 방지하는 물부동펌핑장치는 일반 물 또는 바닷물을 LNG 화물창내로 투입시켜 슬로싱 현상 등이 완전히 억제되어 화물창 내의 유탄성과 공진현상을 방지하고자 하는 목적이 있다.Water floating pumping device for preventing the sloshing of the LNG according to the present invention is intended to prevent the elasticity and resonant phenomenon in the cargo hold by the general water or sea water is introduced into the LNG cargo hold, the sloshing phenomenon is completely suppressed.

본 발명에 따른 LNG의 슬로싱을 방지하는 물부동펌핑장치는 다수개의 체크 밸브와 센서의 구조로서 슬로싱 현상과 유탄성과 공진현상을 억제하고자하는 목적이 있다.Water floating pumping device for preventing the sloshing of LNG according to the present invention has the purpose of suppressing the sloshing phenomenon and the elasticity and resonance phenomenon as a structure of a plurality of check valves and sensors.

본 발명에 따른 LNG선박의 화물창내 LNG의 슬로싱을 방지하기 위한 물부동펌핑장치는 LNG선박의 LNG 화물창으로부터 외부 상측으로 연통된 통; 상기 LNG 화물창내에서 기화되는 가스의 임의 설정 압력에 따라 개폐되는 제1밸브; 상기 통에 설치되어 LNG 수면의 최고점 신호 및 최저점 신호를 감지하는 센서; 및 상기 센서부터 발생된 신호에 따라 물을 상기 통로 유입시키는 물부동펌핑수단을 포함하여 통내로 유입되는 물을 얼음으로 변환시켜 LNG보다 비중이 높은 얼음이 LNG 화물창내에 가라앉아 LNG 수면이 통내에 위치하도록 유지시켜 슬로싱 현상을 방지하는 것이 바람직하다.       Water floating pumping device for preventing the sloshing of LNG in the cargo hold of the LNG vessel according to the present invention is a barrel communicated to the outside from the LNG cargo hold of the LNG vessel; A first valve opened and closed according to an arbitrary set pressure of gas vaporized in the LNG cargo hold; A sensor installed in the barrel to detect a peak signal and a lowest signal of the surface of LNG; And a water floating pumping means for introducing water into the passage according to the signal generated from the sensor, thereby converting the water flowing into the barrel into ice so that ice having a higher specific gravity than the LNG sinks in the LNG cargo hold so that the LNG surface is located in the barrel. It is desirable to keep the mold to prevent sloshing.

본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창은 슬로싱 현상 등이 완전히 억제되어 화물창 내의 유탄성과 공진현상을 방지할 수 있고, 특히 종래 LNG 선박 보다 화물창의 LNG를 20~30% 절약할 수 있는 효과가 있다.Cargo hold having a structure to prevent the sloshing of LNG according to the present invention can prevent the sloshing phenomenon and the like completely to prevent the elasticity and resonance phenomenon in the cargo hold, in particular 20 to 30% of LNG in the cargo hold than conventional LNG ships It can work.

본 발명은 5개의 체크 밸브와 센서의 구조로서 슬로싱 현상과 유탄성과 공진현상을 억제할 수 있는 효과가 있다. The present invention has the effect of suppressing sloshing, elasticity and resonance as a structure of five check valves and sensors.

이하 도면을 참조하여 본 발명의 실시를 위한 구체적인 내용을 자세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도2는 본 발명의 LNG의 슬로싱을 방지하는 구조를 가지는 화물창을 갖추고 있는 LNG 선박의 평면도이고, 도3과 도4는 본 발명의 LNG의 슬로싱을 방지하는 구조를 가지는 화물창을 갖추고 있는 LNG 선박의 화물창과 증발가스탱크의 측면도를 나타낸다.2 is a plan view of an LNG ship having a cargo hold having a structure for preventing sloshing of LNG of the present invention, and FIGS. 3 and 4 are LNG having a cargo hold having a structure for preventing sloshing of LNG of the present invention. Side view of the cargo hold and the boil-off gas tank of the ship.

본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창(貨物艙)은 크게 LNG 화물창(10)과 파이프 부분이 선박에 연결되어 있으며, 도2의 선박을 보면 갑판위에 본 장치의 파이프가 올라온 부분이 하나의 LNG 화물창(10)당 가로로 3개씩 위치하게 되며, 도3의 LNG 화물창(10)에서 갑판위로 뻗어나온 통(103) 부분의 올라온 형상이 설치되고, 도4는 도3의 가~나 부분의 절단면으로 LNG 화물창(10) 위로 뻗어나온 통 부분에 최고점과 최저점상으로 LNG 수면이 위치하게 된다.Cargo hold (구조 物 艙) having a structure for preventing the sloshing of LNG according to the present invention is largely connected to the LNG cargo hold 10 and the pipe portion, and when looking at the vessel of Figure 2 the pipe of the device is raised on the deck The portion is located three horizontally per one LNG cargo hold 10, the raised shape of the barrel 103 extending from the LNG cargo hold 10 of Figure 3 extending over the deck is installed, Figure 4 is The surface of LNG is located at the highest point and the lowest point in the barrel portion extending above the LNG cargo hold 10 with the cut surface of the portion.

본 발명은 LNG선박의 LNG 화물창(100)으로부터 외부 상측으로 연통된 통(103); 상기 LNG 화물창(100)내에서 기화되는 가스의 임의 설정 압력에 따라 개폐되는 제1밸브(201); 상기 통(103)에 설치되어 LNG 수면의 최고점 신호 및 최저점 신호를 감지하는 센서(130); 및 상기 센서(130)로부터 발생된 신호에 따라 물을 상기 통(103)내로 유입시키는 물부동펌핑수단을 포함한다.       The present invention is a container 103 communicated to the outside from the LNG cargo hold 100 of the LNG vessel; A first valve 201 opened and closed according to an arbitrary set pressure of the gas vaporized in the LNG cargo hold 100; A sensor (130) installed in the barrel (103) for detecting a peak signal and a lowest signal of the surface of LNG; And water floating pumping means for introducing water into the barrel 103 according to a signal generated from the sensor 130.

상기 물부동펌핑수단은 상기 통(103)과 연통되고, 상기 물이 얼지 않도록 진공파이프관(120)으로 이루어진 제1파이프관(120a) 및 상기 제1파이프관(102a)과 연통되어 상기 통(103)내로 유입되는 제2파이프관(120b)을 포함하는 이중송수관(110); 상기 이중송수관(110)의 일측에 설치되어 상기 센서(130)의 최저점 신호에 의해 작동되고 상기 최고점 신호에 의해 정지하는 펌프(105); 상기 이중송수관(110)상에 설치되고, 상기 펌프(105)와 통(103) 사이에 설치되어 상기 펌프(105)가 작동되면 폐쇄되고, 정지하면 개방되는 제2밸브(202); 상기 제2밸브(202)가 개방되고 배수 완료되면 상기 제1파이프관(120a)을 폐쇄하는 제3밸브(203); 상기 제3밸브(203) 작동 후 제2파이프관(120b)을 폐쇄하는 제4밸브(204); 상기 제3밸브(203) 내부에 물로 인해 얼음이 생길 경우 이를 배출시키기 위한 제5밸브(205);를 포함한다.       The water floating pumping means communicates with the barrel 103 and communicates with the first pipe tube 120a and the first pipe tube 102a formed of a vacuum pipe tube 120 so that the water does not freeze. A double water pipe 110 including a second pipe pipe 120b introduced into the 103; A pump 105 installed at one side of the double water pipe 110 and operated by the lowest signal of the sensor 130 and stopped by the highest signal; A second valve 202 installed on the double water pipe 110 and installed between the pump 105 and the barrel 103 to close when the pump 105 is operated and to open when stopped; A third valve 203 for closing the first pipe pipe 120a when the second valve 202 is opened and drainage is completed; A fourth valve 204 for closing the second pipe pipe 120b after the third valve 203 is operated; And a fifth valve 205 for discharging ice when water is generated in the third valve 203 due to water.

본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창(100)은, 일반 물 또는 바닷물을 LNG 화물창(100)내로 투입시키면 얼음으로 변환돼 비중이 높은 얼음이 화물창내에 가라앉아 LNG를 최저점 이상으로 유지시켜 출렁거림 현상을 방지하는 원리를 이용하여, LNG 화물창(100) 및 상기 LNG 화물창(100)으로부터 상 측으로 연장되고 직경이 상기 LNG 화물창(100)보다 직경이 훨씬 작아진 통(103)이 설치되고, LNG 화물창(100)내부에서 가스의 압력이 설정해 놓은 내부 압력에 도달하면 상기 통(103)의 센서(130)를 통해 LNG 수면의 최고점 및 최저점을 감지하고 가스 압력에 의해 제1밸브(201)가 개방되어 설정 압력보다 낮아지면 제1밸브(201)가 폐쇄되며, 송수물이 얼지 않도록 그 주위를 둘러싼 진공파이프관(120)을 포함하는 이중송수관(110)이 설치되고, 센서(130)는 기준 수치 범위 내에서 최고점 이상 신호와 최저점 이하 신호를 발생시키며, 펌프(105)는 상기 이중송수관(110)에 설치되어 상기 센서(130)의 최저점 이하 신호에 의해 작동되며 상기 최고점 이상 신호에 의해 정지되고, 제2밸브(202)는 상기 펌프(105)가 작동되면 닫히며, 정지하면 열리고, 제3밸브(203)는 상기 제2밸브(202)가 열리고 통수물이 배수 완료되면 제1파이프관(120a)을 폐쇄하며, 제4밸브(204)는 상기 제3밸브(203) 작동 후 제2파이프관(120b)을 폐쇄하고, 상기 제3밸브(203) 내부에 물로 인해 얼음이 생길 경우 제5밸브(205)를 개방하여 고온 스팀 작업 등으로 얼음을 제거하고, 제3밸브(203)가 정상 작동하도록 유지시키는 구조를 갖는다.The cargo hold 100 having a structure for preventing sloshing of LNG according to the present invention is converted into ice when general water or seawater is put into the LNG hold 100 so that ice having a high specific gravity sinks in the hold so that LNG is above a minimum point. By using the principle to prevent the slump phenomenon, the tank 103 is extended upward from the LNG cargo hold 100 and the LNG cargo hold 100 and the diameter is much smaller than the LNG cargo hold 100 is Installed, when the pressure of the gas reaches the internal pressure set in the LNG cargo tank 100, the sensor 130 of the barrel 103 detects the highest point and the lowest point of the LNG surface and the first valve ( When 201 is opened and lower than the set pressure, the first valve 201 is closed, and a double water pipe 110 including a vacuum pipe 120 surrounding the water so that the water does not freeze is installed, and the sensor 130 ) Is a standard A high point signal and a low point signal within a range of values, the pump 105 is installed in the double water pipe 110 is operated by the signal below the low point of the sensor 130 and stopped by the signal above the high point The second valve 202 is closed when the pump 105 is operated and is opened when stopped. The third valve 203 is opened when the second valve 202 is opened and the water is completed. 120a) is closed, and the fourth valve 204 closes the second pipe pipe 120b after the third valve 203 is operated, and when ice is generated in the third valve 203 due to water, the fifth valve is closed. The valve 205 is opened to remove ice by a high temperature steam operation or the like, and the third valve 203 is maintained to operate normally.

상술한 본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창의 작동 방법을 도4의 A 부분을 확대한 도5를 이용하여 자세히 설명하면, 먼저 LNG 선박 운항 중 가스의 압력에 의해 상기 제1밸브(201)가 열리고 닫는 것을 반복한 후 LNG 수면이 최저점에 도달하면 제2밸브(202)는 폐쇄되고, 제3밸브(203) 및 제4밸브(204)가 열리고 제5밸브(205)는 폐쇄된 상태에서 상기 펌프(105)에 의해 상기 이중송수관(110)으로 송수물을 투입하면, 상기 유입된 송수물은 얼음으로 바뀌어 LNG 화물창(100)내부 바닥으로 가라앉고 LNG수면은 상기 최저점에서 최고점으로 올라가서 상기 펌프(105)가 정지하며, 상기 펌프(105)의 정지에 따라 상기 제3밸브(203)가 먼저 폐쇄되고, 상기 제4밸브(204)가 다음에 패쇄된 후, 상기 제2밸브(202)가 열려 이중송수관(110)내의 남아있는 물을 외부로 유출시키고, 제5밸브(205)가 개방되어 제1파이프관(120a)내의 물 및 얼음을 별도 고온 스팀 작업 등으로 제거하며, 이러한 작동의 반복으로 LNG의 수면을 최저점 이상으로 유지시킨다.The operation of the cargo hold having a structure for preventing sloshing of LNG according to the present invention described above will be described in detail with reference to FIG. 5 in which the portion A of FIG. 4 is enlarged. After the first valve 201 is repeatedly opened and closed, when the LNG surface reaches the lowest point, the second valve 202 is closed, the third valve 203 and the fourth valve 204 are opened, and the fifth valve 205 is closed. When the water is fed into the double water pipe 110 by the pump 105 in the closed state, the incoming water is changed to ice to sink to the inner bottom of the LNG cargo hold 100 and the LNG surface at the lowest point The pump 105 stops ascending to the highest point, and the third valve 203 is first closed in response to the stop of the pump 105, and the second valve 204 is then closed. The valve 202 opens to drain the remaining water in the double water pipe 110 to the outside. And, fifth, and valve 205 is opened to remove the water and ice in the first pipe tube (120a) including a separate hot steam operation, to maintain the surface of the LNG to the repetition of such operation above the lowest point.

이때, 어떠한 일이 있어도 제4밸브(204)가 얼어 작동이 안되는 일이 없도록 제3밸브(203)가 제4밸브(204) 보다 먼저 닫힌다.At this time, in any case, the third valve 203 is closed before the fourth valve 204 so that the fourth valve 204 does not freeze.

상술한 단계를 반복해가면서, 본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창의 LNG 수면을 화물창 위로 최저점과 최고점 사이에 유지시켜 LNG 소모를 획기적으로 막을 수 있다.By repeating the above-described steps, the LNG surface of the cargo hold having a structure to prevent sloshing of the LNG according to the present invention can be maintained between the lowest point and the highest point over the cargo hold to prevent LNG consumption.

또한 상기 제1밸브(201) 내지 제5밸브(205)는 일방향성을 가진 체크밸브인 것이 바람직하며 상기 센서(130)도 도5와 같이 육안으로 확인 가능한 센서일 수도 있고, 자동화된 유량센서로 대체될 수 있다.In addition, the first valve 201 to the fifth valve 205 is preferably a check valve having a one-way, the sensor 130 may also be a sensor that can be visually confirmed as shown in Figure 5, or as an automated flow sensor Can be replaced.

그리고 본 발명에 따른 LNG 선박은 목적지에 도착 후, LNG를 빼낸 후에 화물창 안에 있는 얼음은 별도 고온 세척에 의해 녹여 청소가 가능해 용이하게 관리가 가능하다.After the LNG ship according to the present invention arrives at the destination, after removing the LNG, the ice in the cargo hold can be easily melted and cleaned by high temperature washing, and thus can be easily managed.

따라서, 본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창은 종래발명과 달리 슬로싱 현상 등이 완전히 억제되어 화물창 내의 유탄성과 공진현 상을 방지할 수 있는 것이다.Therefore, the cargo hold having a structure for preventing the sloshing of LNG according to the present invention, unlike the present invention, the sloshing phenomenon is completely suppressed to prevent the elasticity and resonance phenomenon in the cargo hold.

이상에서 설명한 본 발명은 전술한 실시예 및 첨부된 도면에 의해 한정되는 것은 아니며, 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 변경 및 변형이 가능하다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어 명백하다 할 것이다.The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, changes, and modifications are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

도1은 종래 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창의 개략적인 구조를 나타내는 도면.1 is a view showing a schematic structure of a cargo hold having a structure for preventing sloshing of LNG according to the conventional invention.

도2는 본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창의 NG 선박의 평면도.Figure 2 is a plan view of the NG vessel of the cargo hold having a structure to prevent sloshing of LNG according to the present invention.

도3은 본 발명의 LNG의 슬로싱을 방지하는 구조를 가지는 화물창을 갖추고 있는 LNG 선박의 화물창.3 is a cargo hold of an LNG ship having a cargo hold having a structure for preventing sloshing of LNG of the present invention.

도4는 본 발명의 LNG의 슬로싱을 방지하는 구조를 가지는 화물창을 갖추고 있는 증발가스탱크의 측면도.Figure 4 is a side view of the boil-off gas tank having a cargo hold having a structure for preventing the sloshing of LNG of the present invention.

도5는 본 발명에 따른 LNG의 슬로싱을 방지하는 구조를 가지는 화물창의 상세도.5 is a detailed view of a cargo hold having a structure for preventing sloshing of LNG according to the present invention.

<도면의 주요부분에 대한 설명><Description of main parts of drawing>

10, 100 : LNG 화물창 10, 100: LNG Cargo Depot

103 : 통 105 : 펌프 103: barrel 105: pump

110 : 이중송수관 120 : 진공파이프관110: double water pipe 120: vacuum pipe pipe

130 : 센서 201 : 제1밸브130 sensor 201 first valve

202 : 제2밸브 203 : 제3밸브202: second valve 203: third valve

204 : 제4밸브 205 : 제5밸브204: fourth valve 205: fifth valve

Claims (3)

LNG선박의 LNG 화물창(100)으로부터 외부 상측으로 연통된 통(103);       The barrel 103 communicated to the outside from the LNG cargo hold 100 of the LNG vessel; 상기 LNG 화물창(100)내에서 기화되는 가스의 임의 설정 압력에 따라 개폐되는 제1밸브(201);       A first valve 201 opened and closed according to an arbitrary set pressure of the gas vaporized in the LNG cargo hold 100; 상기 통(103)에 설치되어 LNG 수면의 최고점 신호 및 최저점 신호를 감지하는 센서(130); 및       A sensor (130) installed in the barrel (103) for detecting a peak signal and a lowest signal of the surface of LNG; And 상기 센서(130)로부터 발생된 신호에 따라 물을 상기 통(103)내로 유입시키는 물부동펌핑수단을 포함하여 통(103)내로 유입되는 물을 얼음으로 변환시켜 LNG보다 비중이 높은 얼음이 LNG 화물창(100)내에 가라앉아 LNG 수면이 통(103)내에 위치하도록 유지시켜 슬로싱 현상을 방지하는 것을 특징으로 하는       Including the water floating pumping means for introducing water into the barrel 103 in accordance with the signal generated from the sensor 130 converts the water introduced into the barrel 103 into ice to ice with a higher specific gravity than LNG cargo hold Sink in (100) to maintain the LNG water surface in the barrel 103 to prevent sloshing phenomenon 액화천연가스 선박의 화물창내 액화천연가스의 슬로싱을 방지하기 위한 물부동펌핑장치.       Liquefied natural gas Water floating pump to prevent sloshing of liquefied natural gas in the cargo hold of a ship. 제1항에 있어서,       The method of claim 1, 상기 물부동펌핑수단은        The water floating pumping means 상기 통(103)과 연통되고, 상기 물이 얼지 않도록 진공파이프관(120)으로 이루어진 제1파이프관(120a) 및 상기 제1파이프관(102a)과 연통되어 상기 통(103)내로 유입되는 제2파이프관(120b)을 포함하는 이중송수관(110);       The first tube pipe 120a and the first pipe pipe 102a made of a vacuum pipe tube 120 to communicate with the cylinder 103 so as not to freeze the water flowing into the cylinder 103 Double water pipe 110 including a two pipe pipe (120b); 상기 이중송수관(110)의 일측에 설치되어 상기 센서(130)의 최저점 신호에 의해 작동되고 상기 최고점 신호에 의해 정지하는 펌프(105);A pump 105 installed at one side of the double water pipe 110 and operated by the lowest signal of the sensor 130 and stopped by the highest signal; 상기 이중송수관(110)상에 설치되고, 상기 펌프(105)와 통(103) 사이에 설치되어 상기 펌프(105)가 작동되면 폐쇄되고, 정지하면 개방되는 제2밸브(202); A second valve 202 installed on the double water pipe 110 and installed between the pump 105 and the barrel 103 to close when the pump 105 is operated and to open when stopped; 상기 제2밸브(202)가 개방되고 배수 완료되면 상기 제1파이프관(120a)을 폐쇄하는 제3밸브(203);A third valve 203 for closing the first pipe pipe 120a when the second valve 202 is opened and drainage is completed; 상기 제3밸브(203) 작동 후 제2파이프관(120b)을 폐쇄하는 제4밸브(204);A fourth valve 204 for closing the second pipe pipe 120b after the third valve 203 is operated; 상기 제3밸브(203) 내부에 물로 인해 얼음이 생길 경우 이를 배출시키기 위한 제5밸브(205);를 포함하되,And a fifth valve 205 for discharging ice when water is generated in the third valve 203 due to water. 상기 제1밸브(201)가 개방되고 폐쇄되는 것을 반복한 후 제2밸브(202)가 폐쇄되고, 제3밸브(203) 및 제4밸브(204)가 개방되며, 제5밸브(205)는 폐쇄된 상태에서 상기 펌프(105)에 의해 상기 이중송수관(110) 및 통(103) 내부로 물을 투입하면, 상기 유입된 물은 얼음으로 바뀌어 LNG 화물창(100)내부 바닥으로 가라앉고 LNG 수면은 최고점에 도달하면서 상기 센서(130)의 최고점 신호에 의해 상기 펌프(105)가 정지되고,After the first valve 201 is repeatedly opened and closed, the second valve 202 is closed, the third valve 203 and the fourth valve 204 are opened, and the fifth valve 205 is closed. When water is introduced into the double water pipe 110 and the barrel 103 by the pump 105 in the closed state, the introduced water is turned into ice and sinks to the inner bottom of the LNG cargo hold 100 and the surface of LNG is The pump 105 is stopped by the peak signal of the sensor 130 while reaching the highest point, 상기 펌프(105)의 정지에 따라 상기 제3밸브(203)가 먼저 폐쇄되고, 상기 제4밸브(204)가 다음에 패쇄된 후, 상기 제2밸브(202) 및 제5밸브(205)가 개방되는 것을 특징으로 하는 액화천연가스 선박의 화물창내 액화천연가스의 슬로싱을 방지하기 위한 물부동펌핑장치.As the pump 105 is stopped, the third valve 203 is first closed, and the fourth valve 204 is subsequently closed, and then the second valve 202 and the fifth valve 205 are closed. A water floating pump for preventing sloshing of liquefied natural gas in a cargo hold of a liquefied natural gas ship, characterized in that it is opened. 제2항에 있어서,The method of claim 2, 상기 제1밸브(201) 내지 제5밸브(205)는 체크밸브인 것을 특징으로 하는 액화천연가스 선박의 화물창내 액화천연가스의 슬로싱을 방지하기 위한 물부동펌핑장치.The first valve 201 to the fifth valve 205 is a water floating pump for preventing the sloshing of the liquefied natural gas in the cargo hold of the liquefied natural gas ship, characterized in that the check valve.
KR1020090033785A 2009-04-17 2009-04-17 Nonfreezing water pumping system for preventing lng sloshing in the cargo container of lng ship KR100921507B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190064897A (en) * 2017-12-01 2019-06-11 주식회사 포스코 Storage tank
KR20190068838A (en) * 2017-12-11 2019-06-19 주식회사 포스코 Storage tank

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03684A (en) * 1989-05-12 1991-01-07 Takenaka Komuten Co Ltd Sloshing control construction for liquid storage tank
JP2000103388A (en) 1998-09-30 2000-04-11 Kinzo Ri Offshore structure
KR20000025585A (en) * 1998-10-13 2000-05-06 이해규 Reducing device for resistance of moon pool in ship
KR100899997B1 (en) * 2007-10-11 2009-05-29 삼성중공업 주식회사 Sloshing free cargo tank by re-liquefaction of boil off gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190064897A (en) * 2017-12-01 2019-06-11 주식회사 포스코 Storage tank
KR20190068838A (en) * 2017-12-11 2019-06-19 주식회사 포스코 Storage tank

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