KR20170065292A - Tank for reducing boil off gas - Google Patents

Tank for reducing boil off gas Download PDF

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Publication number
KR20170065292A
KR20170065292A KR1020150171547A KR20150171547A KR20170065292A KR 20170065292 A KR20170065292 A KR 20170065292A KR 1020150171547 A KR1020150171547 A KR 1020150171547A KR 20150171547 A KR20150171547 A KR 20150171547A KR 20170065292 A KR20170065292 A KR 20170065292A
Authority
KR
South Korea
Prior art keywords
liquid
liquid cargo
cooling unit
bog
cargo
Prior art date
Application number
KR1020150171547A
Other languages
Korean (ko)
Inventor
서가희
Original Assignee
삼성중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020150171547A priority Critical patent/KR20170065292A/en
Publication of KR20170065292A publication Critical patent/KR20170065292A/en

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B65D88/744—Large containers having means for heating, cooling, aerating or other conditioning of contents heating or cooling through the walls or internal parts of the container, e.g. circulation of fluid inside the walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/52—Anti-slosh 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A liquid cargo storage tank for BOG reduction is disclosed.
According to an embodiment of the present invention, there is provided a liquid container comprising: a tank body in which liquid contents are stored; A cooling unit which is installed above the oil level of the liquid cargo inside the tank body and receives a liquefied gas having a temperature lower than the boiling point temperature of the liquid cargo; And a connecting means for connecting the cooling unit to the inside of the tank body may be provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid storage tank for reducing BOG,

The present invention relates to a liquid cargo storage tank for BOG reduction.

Liquid cargo generally refers to a liquid gaseous substance, a liquid compound, a flammable liquid substance, an epidemic liquid substance, and the like, and may be present at a cryogenic temperature (for example, about -163 ° C) of 0 ° C or less.

Cryogenic liquefied natural gas (LNG) can be stored in a liquefied state in a cargo hold and carried by a liquefied natural gas carrier or an Eljen transport. The cargo hold on the liquefied natural gas carrier can be divided into independent tank type and membrane type according to the classification of the cargo storage tank. In addition, a liquefied natural gas carrier may be provided with a cargo hold including any installation for storing liquid cargo associated with a plurality of cargo storage tanks.

In addition, a BOG liquefaction system, which treats BOG (Boil Off Gas) generated by evaporation by heat input around liquid cargo (eg, LNG) stored in the cargo storage tank using the cool heat of the liquid cargo itself .

However, since the conventional liquid cargo storage tank as described above focuses on the treatment of the generated BOG, it does not suggest a technique for suppressing the generation of BOG in the cargo storage tank. Therefore, There is a problem that must continue to occur in the storage tank.

In addition, in the conventional liquid storage tank, when the carrier sharply swings, there is a problem that the BOG is promoted due to the slushing by causing the liquid cargo to slack out.

Korean Patent Laid-Open No. 10-2009-130267 (disclosed on December 21, 2009)

An embodiment of the present invention is to provide a liquid cargo storage tank for reducing BOG, which suppresses the generation of BOG in a liquid cargo tank for storing liquid cargo and prevents the elapse of liquid cargo.

According to an aspect of the present invention, there is provided a liquid container comprising: a tank body in which liquid contents are stored; A cooling unit which is installed above the oil level of the liquid cargo inside the tank body and receives a liquefied gas having a temperature lower than the boiling point temperature of the liquid cargo; And a connecting means for connecting the cooling unit to the inside of the tank body may be provided.

Further, the cooling unit is formed to have a size corresponding to the oil surface area of the liquid cargo, so that it is possible to suppress the oil surface from being swollen.

The liquefied gas may also be liquefied nitrogen.

The connecting means may be provided in the form of a chain in which a plurality of rings are connected to each other so that the cooling means can move along with the liquid contents.

Further, the cooling unit may be connected to a manifold for injecting or discharging the liquefied gas into the cooling unit.

According to the embodiment of the present invention, it is possible to provide a liquid cargo storage tank for BOG reduction, which suppresses the generation of BOG in the liquid cargo tank storing the liquid cargo and prevents the liquid cargo from being swollen.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a carrier carrying a liquid cargo storage tank for BOG reduction according to an embodiment of the present invention;
2 is a side view showing a liquid cargo storage tank for BOG reduction according to an embodiment of the present invention,
3 is a plan view of a liquid cargo storage tank for BOG reduction according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, a liquid storage tank for BOG reduction according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a side view of a liquid storage tank for BOG reduction according to an embodiment of the present invention. FIG. 2 is a side view showing a liquid cargo storage tank for reducing BOG according to an embodiment of the present invention. 3 is a plan view showing a liquid cargo storage tank for BOG reduction according to an embodiment of the present invention.

Referring to FIG. 1, a plurality of storage tanks 100 for storing and storing the liquid cargo in a liquefied state may be provided on a carrier 10 for transporting liquid cargo such as LNG.

The storage tank 100 has an internal structure of a narrow upper part and a wider lower part. The liquid storage stored in the storage tank 100 evaporates due to the surrounding heat and generates BOG.

Therefore, in order to suppress the occurrence of BOG, it is helpful to keep the temperature of the liquid cargo from rising. For example, when the liquid is a liquefied natural gas (LNG), the LNG has a boiling point of -162 DEG C, so that the LNG is maintained in a liquid state at a temperature lower than -162 DEG C. However, when the internal temperature of the storage tank 100 rises, , It is possible to suppress the generation of BOG by maintaining a temperature of -162 ° C or lower in order to prevent vaporization of LNG.

In addition, even when the carrier 10 meets a wave during a voyage and flows severely, the generation of BOG increases while the liquid cargo is swollen. Thus, prevention of swelling of the liquid cargo can also suppress the occurrence of BOG.

Hereinafter, a liquid storage tank 100 for BOG reduction according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. The BOG reducing liquid storage tank 100 according to the present embodiment may include a tank body 110, a cooling unit 120, and a connection unit 130.

The tank body 110 may be made of a pressure vessel capable of effectively holding internal pressure, for example, for storing a liquid material 20 such as LNG. Also, the tank body 110 may be a single structure container composed of a single container and a heat insulating material surrounding it, or a dual structure container made up of an inner container, an outer container, and a heat insulating material provided therebetween.

Here, the internal temperature of the tank body 110 may be determined according to the type of the liquid cargo 20 to be stored. When the liquid cargo 20 is a material that maintains a liquid state at a cryogenic temperature, 110) shall be used as a metal that can withstand cryogenic temperatures and its thickness shall be determined to withstand the internal pressure.

The cooling unit 120 is installed in the tank body 110 above the oil level 21 of the liquid body 20 and has a temperature lower than the boiling point of the liquid body 20 121 are accommodated.

That is, the cooling unit 120 may store or receive a liquefied gas 121 that maintains a temperature lower than the boiling point of the liquid cargo 20, and the cooling unit 120 may surround the liquid cargo 20 It is possible to prevent BOG of the liquid cargo 20 from ultimately being generated. In addition, the BOG already generated in a small amount can be reduced by condensing on the surface of the cooling unit 120 having a relatively low temperature to be re-liquefied.

Specifically, the cooling unit 120 may have a predetermined accommodation space therein and may be disposed at a position higher than the oil level 21 of the liquid cargo 20 (e.g., LNG) stored in the tank body 110 And may have a size corresponding to the area of the oil surface 21 of the liquid body 20. In this embodiment, the cooling unit 120 is made of a lightweight stainless steel material and is formed in a rectangular shape, but the shape of the cooling unit 120 may be variously presented.

The cooling unit 120 may be filled with or supplied with the liquefied gas 121 having a temperature lower than the boiling point temperature of the liquid cargo 20. The temperature of the liquefied gas 121 may be supplied to the cooling unit 120, The entire body is cooled and the ambient temperature is lowered to prevent vaporization of the liquid cargo 20 stored in the tank body 110, thereby suppressing the generation of BOG.

Since the cooling unit 120 is formed to have a size corresponding to the area of the oil surface 21 of the liquid material 20 so as to cover the oil surface 21 of the liquid material 20, Even if sloshing of the liquid cargo 20 occurs, it is possible to minimize the fluidity of the liquid cargo 20 by preventing the entanglement, thereby minimizing the occurrence of BOG. Here, the liquefied gas 121 may be liquefied nitrogen whose temperature is lower than that of the LNG when the liquid cargo 20 is LNG. The boiling point of the LNG is -162 ° C. and the liquefied nitrogen is -196 ° C., It is possible to prevent LNG from being vaporized by using low liquid nitrogen.

3, the connecting unit 130 connects the cooling unit 120 to the inside of the tank body 110. The cooling unit 120 is connected to the cooling unit 120 120 may be formed in a chain shape in which a plurality of rings are connected to each other so as to be relatively free to move. The connecting means 130 may also be made of stainless steel for weight saving.

A manifold 140 through which the liquefied gas 121 moves may be connected to the cooling unit 120 to inject or discharge the liquefied gas 121 into the cooling unit 120. The manifold 140 is connected to a pump tower (not shown) provided at an upper portion of the tank body 110 to receive and discharge the liquefied gas 121.

Therefore, according to the embodiment of the present invention, the liquid cargo 20 stored in the tank body 110 is vaporized by the temperature of the liquefied gas 121 supplied to the cooling unit 120 through the manifold 140 And the cooling unit 120 reduces sloshing when slushing of the liquid cargo 20 occurs, thereby suppressing the occurrence of BOG in the tank body 110. Particularly, when the liquid cargo 20 is swirled in the tank body 110, the connecting means 130, which is provided in a chain form, moves together to suppress the swelling of the liquefied cargo.

While the present invention has been described in connection with what is presently considered to be preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto.

10: Carrier 120: Cooling unit
20: liquid cargo 130: connecting means
21: Oil level of liquid cargo 140: Manifold
100: Liquid cargo storage tank
110: tank body

Claims (4)

A tank body in which liquid cargo is stored;
A cooling unit which is installed above the oil level of the liquid cargo inside the tank body and receives a liquefied gas having a temperature lower than the boiling point temperature of the liquid cargo; And
Connecting means for connecting the cooling unit to the inside of the tank body;
And a liquid storage tank for reducing BOG. The method according to claim 1,
Wherein the cooling unit is formed to have a size corresponding to the oil surface area of the liquid cargo and inhibits the oil surface from being swollen. The method according to claim 1,
Wherein the connecting means is provided in the form of a chain in which a plurality of rings are connected to each other so that the cooling means can move along with the liquid cargo. The method according to claim 1,
Wherein the cooling unit is connected to a manifold for injecting or discharging the liquefied gas into the cooling unit.
KR1020150171547A 2015-12-03 2015-12-03 Tank for reducing boil off gas KR20170065292A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020150171547A KR20170065292A (en) 2015-12-03 2015-12-03 Tank for reducing boil off gas

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KR20170065292A true KR20170065292A (en) 2017-06-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190066178A (en) * 2017-12-05 2019-06-13 대우조선해양 주식회사 Boil-of-rate reduction system for lng cargo
KR20210034365A (en) * 2019-09-20 2021-03-30 삼성중공업 주식회사 LNG fuel tank for BOG reduction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190066178A (en) * 2017-12-05 2019-06-13 대우조선해양 주식회사 Boil-of-rate reduction system for lng cargo
KR20210034365A (en) * 2019-09-20 2021-03-30 삼성중공업 주식회사 LNG fuel tank for BOG reduction

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