KR20170029196A - Ship for storage of liquefied gas - Google Patents

Ship for storage of liquefied gas Download PDF

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Publication number
KR20170029196A
KR20170029196A KR1020150126213A KR20150126213A KR20170029196A KR 20170029196 A KR20170029196 A KR 20170029196A KR 1020150126213 A KR1020150126213 A KR 1020150126213A KR 20150126213 A KR20150126213 A KR 20150126213A KR 20170029196 A KR20170029196 A KR 20170029196A
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South Korea
Prior art keywords
liquefied gas
storage tank
tank
gas
storage
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KR1020150126213A
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Korean (ko)
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KR101763708B1 (en
Inventor
조성인
김현철
방창선
이종규
황정오
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삼성중공업 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • 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
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • 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)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A liquefied gas storage vessel is disclosed. A liquefied gas storage vessel according to an embodiment of the present invention includes a storage tank for storing a liquefied gas and an evaporated gas; A stand-alone tank disposed above the storage tank and storing the liquefied gas; And a cooling line for supplying the liquefied gas stored in the independent tank to the storage tank to cool the inner wall of the storage tank.

Figure P1020150126213

Description

[0001] SHIP FOR STORAGE OF LIQUEFIED GAS [0002]

The present invention relates to a liquefied gas storage vessel.

As IMO regulations on the emission of greenhouse gases and various air pollutants are strengthened, shipbuilding and marine industries are replacing the use of conventional oil and diesel oil with natural gas, which is a clean energy source, In many cases.

Natural gas, which is widely used in fuel gas, is mainly stored as methane and is stored and transported in a liquefied gas state where the volume thereof is reduced to 1/600.

The vessel storing such liquefied gas is provided with a storage tank which is insulated to store the liquefied gas. At this time, the engine of the ship uses the liquefied gas of the storage tank as the fuel by forcibly vaporizing or uses the boiled off gas naturally occurring in the storage tank as the fuel. For example, a high-pressure (about 5 to 8 bar) injection engine such as a DFDE (Dual Fuel Disel Electric) engine and a ME-GI engine (Man B & W's Gas Injection engine) 150 ~ 400 bar) injection engines are widely used. In addition, a medium pressure gas injection engine capable of combusting with medium pressure (about 16 to 18 bar) fuel gas has been developed and used.

1 shows a conventional liquefied gas storage vessel.

Meanwhile, in order to eliminate the possibility of fire or explosion, before the liquefied gas is shipped again to the storage tank which has conventionally been loaded with liquefied gas or exhausted by the ship fuel, inert gas is supplied into the liquefied gas storage tank to remove oxygen .

1, the liquefied gas remaining in the first storage tank 11 is moved along the connection pipe 20 to cool the inner wall of each of the other storage tanks 12 to 14 . After the cooling operation is completed, a loading process is performed to fill each of the storage tanks 11 to 14 with liquefied gas, and the liquefied gas stored in the storage tank is used as the engine fuel.

The above-described cooling operation is performed to prevent thermal shock from occurring when the liquefied gas is directly filled into the storage tanks 12 to 14. [

However, in order to perform such a cooling operation, the liquefied gas in all of the storage tanks 11 to 14 can not be unloaded, and an appropriate amount of liquefied gas must be left in the first storage tank 11. In addition, since the liquefied gas in the first storage tank 11 is first unloaded and then the liquefied gas is sprayed to each of the other storage tanks 12 to 14, the cooling operation is performed. Therefore, it takes a considerable time and is inefficient. As a technology related to cooling operation, refer to Korean Patent Laid-Open No. 10-2010-0110500 (published on October 13, 2010).

Korean Patent Laid-Open No. 10-2010-0110500 (disclosed on October 13, 2010)

An embodiment of the present invention is to provide a liquefied gas storage vessel that allows an efficient cooling operation to be performed.

According to an aspect of the present invention, there is provided a storage tank for storing a liquefied gas and an evaporated gas; A free-standing tank disposed above the storage tank and storing the liquefied gas; And a cooling line for supplying liquefied gas stored in the independent tank to the storage tank to cool the inner wall of the storage tank.

And a fuel replenishing line for supplying the liquefied gas stored in the independent tank to the fuel of the engine.

A re-liquefaction line for supplying the liquefied gas of the independent tank to the storage tank so that the re-liquefaction of the liquefied gas stored in the storage tank is performed, and a liquefaction line for supplying liquefied gas supplied through the liquefaction line to the inside of the storage tank The refueling line may be branched from the cooling line and extend to the inside of the storage tank.

A condenser for compressing the liquefied gas evaporated gas supplied from the storage tank; a heat exchanger for performing heat exchange between the liquefied gas supplied from the independent tank and the compressed liquefied gas evaporation gas; An expanding portion for expanding the gas,

Further comprising a separator for separating the expanded liquefied gas evaporated gas into a liquid component and a gaseous component, wherein the separated liquid component is stored in the storage tank, and the separated gas component can be stored in the independent tank.

And a circulation line for circulating and supplying the liquefied gas in the independent tank to be stored again in the independent tank through the heat exchanger.

A plurality of the storage tanks may be installed in the vessel, and one or more of the independent tanks may be installed on the vessel deck.

The independent type tank may be a pressure type tank.

The liquefied gas storage vessel according to the embodiment of the present invention can perform an efficient cooling operation.

Also, the liquefied gas stored in the independent tank can be used as fuel for the engine.

In addition, the liquefied gas stored in the independent tank can be used for liquefaction of the liquefied gas evaporated gas in each storage tank.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 shows a conventional liquefied gas storage vessel.
2 shows a liquefied gas storage vessel according to an embodiment of the present invention.
3 shows a liquefied gas storage vessel according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

2, a liquefied gas storage vessel 100 (hereinafter referred to as "vessel 100") according to an embodiment of the present invention is disposed above a storage tank 101 for storing liquefied gas, The liquefied gas stored in the independent tank 110 is supplied to the storage tank 101 before the liquefied gas is filled in the storage tank 101 so that the liquefied gas stored in the inner tank And a cooling line L1 for allowing a cooling operation to be performed on the cooling line L1.

The ship 100 can be used for a variety of liquefied fuel carriers, liquefied fuel RVs (Regasification Vessels), container ships, general merchant ships, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage and Regasification Unit) . In addition, the liquefied gas according to an embodiment of the present invention may include any of liquefied natural gas, liquefied ethane, liquefied ethylene, liquefied petroleum gas, liquefied propane, and liquefied butane.

A plurality of storage tanks (101) are provided inside the vessel (100), and may include, for example, a membrane tank and an SPB tank. The cooling operation can be performed after the liquefied gas is unloaded or the liquefied gas is completely exhausted from the vessel fuel and the deactivation operation is performed on the empty storage tank 101 inside. The deactivation operation can be performed using various known techniques, so that a related description will be omitted.

The cooling operation can be performed using the liquefied gas stored in the independent tank 110. That is, conventionally, a cooling operation is performed by leaving a remaining amount of liquefied gas in one of the storage tanks. However, in the embodiment of the present invention, the cooling operation can be performed using liquefied gas stored in advance in the independent tank.

The independent tank 110 may be a pressure type C type tank of the International Maritime Organization (IMO), or may be implemented as a variety of pressure type tanks.

When the stand-alone tank 110 is made of a pressure tank, the liquefied gas vapor can be held for a substantial period of time without performing evaporative gas treatment caused by the liquefied gas.

The independent tanks 110 may be disposed above the storage tank 101, and one or more of them may be installed on the ship 100 deck. The independent tank 110 is very small in size compared to the storage tank 101 and can be easily installed on the ship deck.

Since the independent tank 110 does not occupy the internal space of the vessel where the storage tank 101 is disposed, the storage tank 101 is designed to receive a large amount of liquefied gas without being interfered with by the independent tank 110 It can be effectively installed inside the vessel.

Since the independent tank 110 is positioned higher than the storage tank 101, the liquefied gas in the independent tank 110 is discharged to the storage tank 101 through the cooling line L1 by the pressure corresponding to the difference in position, Can be effectively exported. One side of the cooling line L1 is connected to the independent tank 110 and the other side is extended to the inside of the storage tank 101. [

In addition, although not shown, the liquefied gas supplied from the independent tank 110 may be sprayed to the inner wall of the storage tank 101 by a spray device to perform a cooling operation. The spray device (not shown) is provided in the cooling line L1 inside the storage tank 101 and can spray the liquefied gas supplied from the independent tank 110 to the inner wall of the storage tank 101. [

The liquefied gas stored in the independent tank 110 may be of the same type as the liquefied gas to be filled into the storage tank 101. Assume, for example, that after the liquefied gas (first liquefied gas) stored in the storage tank 101 has been exhausted by the fuel, the liquefied gas of another kind (second liquefied gas) is filled in the storage tank 101 after the vessel is anchored Let's see.

In this case, if the second liquefied gas to be shipped in the storage tank 101 is stored in advance in the independent tank 110, the second liquefied gas is supplied to the storage tank 101, It is possible to perform the cooling operation in advance.

Because the storage tank 101 is typically quite large, it can take a lot of time to perform the cooling operation. If such cooling work is carried out after berthing, it may be a hindrance to ship freight according to schedule at the ship operation and the supply point. Accordingly, the independent tank 110 can be provided to perform the cooling operation with the second liquefied gas to be loaded into the storage tank 101 during the ship operation, so that a quick and efficient cargo loading work can be performed in the future.

Likewise, if the liquefied gas (the first liquefied gas) stored in the storage tank 101 is loaded and then the other type of liquefied gas (the second liquefied gas) is loaded into the storage tank 101, And the cooling operation for the storage tank 101 can be performed using the stored second liquefied gas.

However, in the embodiment of the present invention, the liquefied gas is stored in the storage tank 101 at a higher level than the storage tank 101, The collective cooling operation for the plurality of storage tanks 101 can be effectively performed by using the liquefied gas stored in the disposed independent tanks 110. [

After the cooling operation for the inner wall of the storage tank 101 is completed using the liquefied gas stored in the independent tank 110, the liquefied gas is loaded into the storage tank 101, and the liquefied gas stored in the storage tank 101 Is supplied to the engine E as fuel. The engine E may include a low pressure, medium pressure or high pressure gas injection engine. The low pressure gas injection engine may include a power generation engine such as a DFDE engine. The low-pressure gas injection engine may be a dual fuel engine that can use not only natural gas but also heavy oil (HFO) as fuel. The medium pressure gas injection engine can utilize fuel gas of about 16 to 18 bar. The high-pressure gas injection engine may include an ME-GI engine using about 150 to 400 bar of fuel gas.

At this time, in the process of supplying the liquefied gas filled in the storage tank 101 to the fuel of the engine E during the operation of the ship 100, the liquefied gas supplied from the storage tank 101 is supplied to the fuel E The fuel replenishing line L2 for supplying the liquefied gas stored in the independent tank 110 to the fuel of the engine E may be provided to compensate for the insufficient fuel amount. In this case, in a state in which the first valve V1 on the cooling line L1 is closed, the second valve V2 on the fuel supplement line L2 is opened. A sensor for measuring the amount of liquefied gas stored in the storage tank 101 and the fuel consumption amount of the engine E may be provided and the control unit controls the valves V1 and V2 based on the measured values Can be controlled.

A re-liquefaction line (L3) for supplying the liquefied gas of the independent tank (110) to the storage tank (101) so that re-liquidization of the liquefied gas stored in the storage tank (101) And a spray nozzle 120 for spraying the liquefied gas, which has been supplied through the spray nozzle 120, into the storage tank 101.

The re-liquefaction line (L3) may be branched from the cooling line (L1) and extend to the inside of each storage tank (101). At this time, the third valve V3 on the remelting line L3 is opened while the first valve V1 is opened, the fourth valve V4 on the cooling line L1 extending inside the storage tank 101, Is closed. Then, the injection nozzle 120 injects the liquefied gas supplied through the re-liquefaction line L3 into the storage tank 101. The injection nozzle 120 may be provided at the end of the refill line L3.

3, as another example, the evaporation gas generated in the storage tank 101 can be re-liquefied by using the liquefied gas stored in the independent tank 110 as a heat exchange medium. A liquefied gas supplied from the independent tank 110 and a liquefied gas evaporated gas compressed by the compressing unit 130 are supplied to the compression unit 130. The compression unit 130 compresses the liquefied gas evaporated gas supplied from the storage tank 101, (150) for expanding the liquefied gas evaporated gas that has passed through the heat exchanging unit (140), and a condenser for condensing the liquefied gas evaporated gas expanded by the expanding unit (150) And a separator 160 for separating the liquid component into liquid components.

The evaporation gas line L4 connects the storage tank 101, the compression unit 130, the heat exchange unit 140, the expansion unit 150, the separator 160, and the independent tank 110.

The liquefied gas in the independent tank 110 is supplied to the heat exchanging unit 140 through the circulation line L5 to perform heat exchange with the liquefied gas evaporated gas in the storage tank 101, It is saved again.

The liquefied gas evaporated gas in the storage tank 101 supplied through the evaporation gas line L4 flows into the separator 160 via the compression unit 130, the heat exchange unit 140 and the expansion unit 150, . The separated liquid component is stored in the storage tank 101 via a return line L6 connected to the upstream end of the compression section 130 of the evaporation gas line L4, And stored in the tank 110.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

101: Storage tank 110: Stand-alone tank
120: injection nozzle 130:
140: Heat exchanger 150: Expansion part
160: separator L1: cooling line
L2: fuel replenishment line L3: refueling line
L4: Evaporation gas line L5: Circulation line
L6: return line

Claims (6)

A storage tank for storing the liquefied gas and the evaporated gas;
A free-standing tank disposed above the storage tank and storing the liquefied gas; And
And a cooling line for supplying liquefied gas stored in the independent tank to the storage tank to cool the inner wall of the storage tank. The method according to claim 1,
And a fuel replenishing line for supplying liquefied gas stored in the independent tank to the fuel of the engine. The method according to claim 1,
A re-liquefaction line for supplying liquefied gas of the independent tank to the storage tank so that re-liquidization of the liquefied gas stored in the storage tank is performed for the evaporation gas;
And a spray nozzle for spraying the liquefied gas supplied through the re-liquefaction line into the storage tank,
And the re-liquefaction line is branched from the cooling line and extends to the inside of the storage tank. The method according to claim 1,
A compression unit for compressing the liquefied gas evaporated gas supplied from the storage tank,
A heat exchange unit for performing heat exchange between the liquefied gas supplied from the independent tank and the compressed liquefied gas evaporated gas,
An expanding section for expanding the liquefied gas evaporated gas that has passed through the heat exchanging section,
Further comprising a separator for separating the expanded liquefied gas evaporated gas into a liquid component and a gaseous component,
The separated liquid component is stored in the storage tank,
Wherein the separated gas component is stored in the independent tank. 5. The method of claim 4,
And a circulation line for circulating and supplying the liquefied gas in the independent tank to be stored again in the independent tank through the heat exchanger. 6. The method according to any one of claims 1 to 5,
A plurality of the storage tanks are installed in the vessel,
The liquefied gas storage vessel in which at least one independent tank is installed on the ship deck.
KR1020150126213A 2015-09-07 2015-09-07 Ship for storage of liquefied gas KR101763708B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190103566A (en) * 2018-02-28 2019-09-05 삼성중공업 주식회사 Liquefied gas storage ship, and operating method thereof
KR20210027713A (en) 2019-09-02 2021-03-11 삼성중공업 주식회사 Cooling down system for liquefied gas storage tank of ship

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230157559A (en) 2022-05-09 2023-11-17 삼성중공업 주식회사 Cool down system for liquefied gas storage tank of ship

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100110500A (en) 2009-04-03 2010-10-13 대우조선해양 주식회사 Replacement method of a liquefied gas storage tank using nitrogen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6184822B2 (en) * 2013-09-26 2017-08-23 泉鋼業株式会社 Marine gas supply system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100110500A (en) 2009-04-03 2010-10-13 대우조선해양 주식회사 Replacement method of a liquefied gas storage tank using nitrogen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190103566A (en) * 2018-02-28 2019-09-05 삼성중공업 주식회사 Liquefied gas storage ship, and operating method thereof
KR20210027713A (en) 2019-09-02 2021-03-11 삼성중공업 주식회사 Cooling down system for liquefied gas storage tank of ship

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