KR20170030781A - LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same - Google Patents

LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same Download PDF

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Publication number
KR20170030781A
KR20170030781A KR1020150128111A KR20150128111A KR20170030781A KR 20170030781 A KR20170030781 A KR 20170030781A KR 1020150128111 A KR1020150128111 A KR 1020150128111A KR 20150128111 A KR20150128111 A KR 20150128111A KR 20170030781 A KR20170030781 A KR 20170030781A
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KR
South Korea
Prior art keywords
tank
storage tank
lng storage
inert gas
bog
Prior art date
Application number
KR1020150128111A
Other languages
Korean (ko)
Inventor
표은석
Original Assignee
현대중공업 주식회사
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Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020150128111A priority Critical patent/KR20170030781A/en
Publication of KR20170030781A publication Critical patent/KR20170030781A/en

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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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • 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
    • F17C3/027—Wallpanels for so-called membrane tanks
    • 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
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • F17C3/085—Cryostats
    • 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

     The present invention relates to a method for measuring the temperature of an inert gas filled in a sealed state in a tank holding space provided with an arrangement structure for enclosing an outer wall of an LNG storage tank in real time and for reducing the temperature of the inert gas to a set temperature The BOG reduction system can be operated to reduce the BOG effectively and improve the performance against the heat insulation. The BOG reduction system is provided with an LNG storage tank, a ballast tank enclosing the LNG storage tank, A tank holding space formed between the tanks and filled with an inert gas in a sealed state, the LNG storage tank assembly comprising: a tank holding space in which a temperature A measuring member; At least one cooling water step that is installed in the tank holding space to cool the inert gas during operation; A control unit electrically connected to the temperature measuring member and the cooling water terminal respectively and controlling the operation of the cooling unit according to the measured temperature of the inert gas; An LNG storage tank assembly having a BOG abatement system constructed therefrom.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LNG storage tank assembly having a BOG reduction system and an LNG storage tank assembly having the BOG reduction system,

The present invention relates to an LNG storage tank assembly having a BOG reduction system and an LNG ship having the BOG reduction system. More particularly, the present invention relates to an LNG storage tank assembly having a BOG reduction system, Therefore, the BOG reduction system for lowering the temperature of the inert gas to the set temperature can be operated to improve the insulation performance and effectively reduce and suppress the BOG.

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 to the off-shore sites through the sea using LNG vessels. LNG vessels are equipped with LNG storage tanks that can withstand the extreme temperatures of LNG. Furthermore, LNG storage tanks are installed not only in the aforementioned LNG carriers but also in offshore structures.

Generally, in the case of an LNG ship, a ballast tank filled with ballast is disposed between the LNG storage tank and the wall of the hull. A tank holding space in which an inert gas is filled in a sealed state is provided between the ballast tank and the LNG storage tank.

In other words, the inert gas of the tank holding space and the ballast water of the ballast tank have a commonality in the heat insulating function for preventing the external heat from being transferred to the LNG storage tank. Especially, the inert gas prevents the fire due to LNG leakage Function.

However, despite the presence of the ballast tank filled with the tank holding space filled with the inert gas and the ballast water as described above, the temperature of the inert gas rises due to the heat transmitted from the outside, thereby increasing the vaporization of the LNG, -Off Gas, hereinafter referred to as "BOG").

As described above, the BOG generated from the LNG storage tank causes the explosion by increasing the pressure in the LNG storage tank. In addition, since the flow of the LNG is accelerated according to the fluctuation of the ship, It is necessary to reduce and inhibit it.

In general, BOG is discharged to the outside of the LNG storage tank to be burnt by a method for treating BOG generated in the LNG storage tank, and BOG is discharged to the outside of the LNG storage tank to re-liquefy, And how to use the BOG as a fuel in a ship's generator or propulsion.

However, when the BOG is excessively generated in the LNG storage tank, the generator or the propulsion engine of the ship can not consume 100% of the BOG. Therefore, the BOG is consumed as the fuel to consume 100% of the BOG There is a problem in that it is necessary to unnecessarily operate various other devices.

As described above, the conventional BOG processing method is merely a passive processing method that expects the fuel saving effect by re-storing the BOG generated by re-liquefying the generated BOG or by using BOG as fuel instead of substantially reducing and suppressing the occurrence of BOG.

Korean Registered Patent Publication No. 10-1511211 (Registered on May 4, 2015)

     SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described in the background of the present invention, and it is an object of the present invention to provide an apparatus for measuring the temperature of an inert gas filled in a sealed state in a tank holding space in real time, And an object of the present invention is to provide an LNG storage tank assembly having a BOG reduction system capable of effectively reducing and suppressing BOG, and an LNG ship having the BOG reduction system.

The LNG storage tank includes a LNG storage tank, a ballast tank enclosing the LNG storage tank, and a tank holding space formed between the ballast tank and the LNG storage tank and filled with an inert gas in a sealed state. A storage tank assembly comprising: a temperature measurement member installed at least one inside a tank holding space to measure a temperature of an inert gas in real time; At least one cooling water step that is installed in the tank holding space to cool the inert gas during operation; A control unit electrically connected to the temperature measuring member and the cooling water terminal respectively and controlling the operation of the cooling unit according to the measured temperature of the inert gas; An LNG storage tank assembly having a BOG abatement system constructed therefrom.

Further, an LNG storage tank assembly having a BOG abatement system in which a heat exchange enhancing part composed of a curved surface structure, a concavo-convex structure, or a bent structure is formed to widen a heat exchange area with respect to a wall surface of a ballast tank partitioned by a tank holding space / RTI >

The LNG storage tank includes a LNG storage tank, a ballast tank enclosing the LNG storage tank, and a tank holding space formed between the ballast tank and the LNG storage tank and filled with an inert gas in a sealed state. A tank assembly comprising: a heat exchange line installed inside a tank holding space in such a structure that an inlet portion and an outlet portion are connected to a ballast tank; A drive pump for providing a circulating supply of ballast water to the heat exchange line; A temperature measuring member installed at least one inside the tank holding space to measure the temperature of the inert gas in real time; A control unit electrically connected to the drive pump and the temperature measuring member, respectively, for controlling the operation of the drive pump according to the measurement temperature of the inert gas; An LNG storage tank assembly having a BOG abatement system constructed therefrom.

Further, an LNG storage tank assembly having a BOG abatement system in which a heat exchange enhancing part composed of a curved surface structure, a concavo-convex structure, or a bent structure is formed to widen a heat exchange area with respect to a wall surface of a ballast tank partitioned by a tank holding space / RTI >

Also, an LNG ship equipped with an LNG storage tank assembly having a BOG reduction system according to the present invention is provided.

     As described above, according to the present invention, when the LNG storage tank assembly having the BOG reduction system and the LNG ship having the BOG reduction system are applied, the BOG reduction system is operated according to the measured temperature of the inert gas to rapidly lower the temperature of the inert gas, It is possible to maintain a stable temperature and to improve the heat insulating function and to remarkably reduce and suppress the occurrence of BOG, thereby reducing the consumption of LNG.

Also, in order to completely exhaust the BOG as in the prior art, it is possible to expect economical operation by enabling unnecessary driving of various driving devices and complete exhaustion of the BOG generated without waste of energy.

1 is a view showing an LNG storage tank assembly having a BOG reduction system according to the present invention and an LNG ship having the same.
2 is a view showing another embodiment of an LNG storage tank assembly having a BOG reduction system according to the present invention and an LNG ship having the same.

     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, a ballast tank 16 for filling the ballast water 14 is disposed between the LNG storage tank 10 and the wall surface of the hull 12, as shown in FIG. 1 A tank holding space 20 in which an inert gas 18 is filled in a sealed state is disposed between the ballast tank 16 and the LNG storage tank 10.

The LNG storage tank assembly having the BOG reduction system according to the present invention includes a cooling unit 22 and a temperature measurement member 24 provided inside the tank holding space 20, And a control unit 26 electrically connected to the means 22 and the temperature measuring member 24 for signals E1 and E2, respectively.

The temperature measuring member 24 and the cooling means 22 are installed at various positions in the tank holding space 20. The temperature measuring member 24 and the cooling means 22 are disposed at various positions The reason why the inert gas 18 is installed is to prevent the temperature measurement and the cooling operation from being stopped when any one of the temperature measuring unit 24 and the cooling unit 22 fails, To be able to be measured at various positions, and to ensure that all the cooling means 22 are simultaneously operated during the cooling operation to quickly lower the temperature of the inert gas 18 in a short time.

Since the cooling unit 22 is electrically connected to the control unit 26 through the signals E1 and E2 as described above, the cooling unit 22 is connected to the electric signal E1 The control operation for repeating the cooling operation and the stopping operation is performed. As the cooling means 22, a unit cooler or a fan coil unit may be applied.

Therefore, the temperature measuring member 24 measures the temperature of the inert gas 18 at various positions in real time, and inputs the measured temperature value of the measured inert gas 18 to the control unit 26. The control unit 26 compares the measured temperature value with a preset temperature value preset in the controller 26. When the measured temperature value is less than the set temperature value, the controller 26 determines that the signal corresponding to the cooling unit 22 So that the operation stop state of the cooling means 22 is maintained.

For example, when it is determined that the measured temperature value input to the controller 26 exceeds the preset temperature value, the controller 26 applies a signal corresponding to the cooling means 22 to the cooling means 22 The temperature of the inert gas 18 is lowered. This cooling operation is continued until the temperature of the inert gas 18 becomes lower than the set temperature value set in the control unit 26. [

When the temperature of the inert gas 18 becomes lower than the set temperature value by the above cooling operation, the control unit 26 applies the signal to the cooling means 22 as described above, The operation is stopped.

Accordingly, the temperature of the inert gas 18 filled in the tank holding space 20 can be stably maintained at the temperature set by the BOG reduction system described above, so that external heat is supplied to the LNG via the inert gas 18 It can be prevented more effectively and the heat insulating function can be further improved. As a result, the generation of BOG can be remarkably reduced and the consumption of LNG can be reduced.

Even if the BOG reduction system configured as above is applied, the BOG that is generated is utilized as a fuel in the ship's generator or propulsion engine described in the Background Art. In this case, in order to completely exhaust the BOG, Various driving devices are unnecessarily driven to cause unnecessary operation and waste of energy. However, in the present invention, since the occurrence of BOG is reduced and suppressed, the amount of generated BOG is not so large, so that BOG can be exhausted completely without the need of operating various unnecessary driving devices, So that the driving of the vehicle can be achieved.

In the previously described FIG. 1, cooling means 22, that is, a unit cooler or a fan coil unit, is preferably applied in order to lower the temperature of the inert gas 18, but the cooling means 22 consisting of a unit cooler or fan coil unit There is no need to limit the structure, and a structure in which the heat exchange line 30 is installed in the tank holding space 20 is described in Fig.

Specifically, the tank holding space 20 is provided with a heat exchange line 30 in a state where an inlet portion 30a and an outlet portion 30b are connected to the ballast tank 16, and the heat exchange line 30, a drive pump 34 is provided.

In addition, a heat sink 30c may be further installed in the heat exchange line 30 to maximize heat exchange.

The temperature measurement member 32 and the drive pump 34 are connected to the control unit 36 in a signal connection manner in the tank holding space 20, have.

That is, the temperature measuring member 32 measures the temperature of the inert gas 18 in real time, and inputs the measured temperature value to the control unit. If the measured temperature value is lower than the preset temperature value, the control unit 36 applies a signal corresponding to the drive pump 34 to the drive pump 34, The operation stop of the motor 34 is maintained.

For example, when the measured temperature value inputted to the controller 36 is determined to be equal to or higher than the preset temperature value, the controller 36 applies a signal corresponding to the drive pump 34 to stop the drive pump 34 And the ballast water 14 of the ballast tank 16 is circulated along the heat exchange line 30 through the operation of the drive pump 34 to perform heat exchange between the ballast water 14 and the inert gas 18 The temperature of the inert gas 18 is lowered.

The heat exchange between the ballast water 14 and the inert gas 18 continues until the temperature of the inert gas 18 is lowered below the set temperature value and the operation of the drive pump 34 continues until the temperature of the inert gas 18 The control unit 36 repeats the operation of applying the signal to the drive pump 34 to stop the operation of the drive pump 34 as described above.

Further, as shown in Figs. 1 and 2 described above, in order to lower the temperature of the inert gas 18, a cooling means 22 and a heat exchange line (not shown) having a drive pump 34 for circulating the ballast water 14 The wall surface of the ballast tank 16, which is in contact with the tank holding space 20 so as to be separated from the tank holding space 20, may be formed of any one of a curved surface structure, The heat exchange enhancement unit 40 is formed to increase the heat exchange area of the inert gas 18 and increase the heat exchange between the inert gas 18 and the ballast water 14, Can be presented.

As described above, although the present invention has been described with reference to specific examples and drawings, the present invention is not limited thereto. 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 present invention as defined by the appended claims.

10: LNG storage tank 12: Hull
14: Number of ballast 16: Ballast tank
18: inert gas 20: tank holding space
22: cooling means 24: temperature measuring member
26, 36: control unit 30: heat exchange line
32: temperature measuring member 34: drive pump
40: Heat exchange enhancement part

Claims (5)

An LNG storage tank, a ballast tank enclosing the LNG storage tank, and a tank holding space formed between the ballast tank and the LNG storage tank and filled with an inert gas in a sealed state, In this case,
A temperature measuring member installed at least one inside the tank holding space to measure the temperature of the inert gas in real time;
At least one cooling water step that is installed in the tank holding space to cool the inert gas during operation;
A control unit electrically connected to the temperature measuring member and the cooling water terminal respectively and controlling the operation of the cooling unit according to the measured temperature of the inert gas;
And an LNG storage tank assembly having a BOG reduction system.
The method according to claim 1,
An LNG storage tank having a BOG abatement system having a curved surface structure, a concavo-convex structure, and a bent structure is formed to widen the heat exchange area with respect to the wall surface of the ballast tank partitioned by the tank holding space. assembly.
An LNG storage tank, a ballast tank enclosing the LNG storage tank, and a tank holding space formed between the ballast tank and the LNG storage tank and filled with an inert gas in a sealed state, In this case,
A heat exchange line installed in the tank holding space in such a structure that an inlet portion and an outlet portion are connected to the ballast tank;
A drive pump for providing a circulating supply of ballast water to the heat exchange line;
A temperature measuring member installed at least one inside the tank holding space to measure the temperature of the inert gas in real time;
A control unit electrically connected to the drive pump and the temperature measuring member, respectively, for controlling the operation of the drive pump according to the measurement temperature of the inert gas;
And an LNG storage tank assembly having a BOG reduction system.
The method of claim 3,
An LNG storage tank having a BOG abatement system having a curved surface structure, a concavo-convex structure, and a bent structure is formed to widen the heat exchange area with respect to the wall surface of the ballast tank partitioned by the tank holding space. assembly.
An LNG carrier having an LNG storage tank assembly with a BOG reduction system according to any one of claims 1 to 4.
KR1020150128111A 2015-09-10 2015-09-10 LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same KR20170030781A (en)

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KR1020150128111A KR20170030781A (en) 2015-09-10 2015-09-10 LNG Storage Tank with BOG Reduction System, LNG Ship Having the Same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018185190A1 (en) * 2017-04-04 2018-10-11 Lnt Marine Pte. Ltd. Multi-layered insulation system for liquefied gas carriers
KR20210073936A (en) * 2019-12-11 2021-06-21 삼성중공업 주식회사 Vessel energy efficiency management system using heat of low temperature fuel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101511211B1 (en) 2013-11-27 2015-04-10 대우조선해양 주식회사 LNG storage tank with BOG reduction device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101511211B1 (en) 2013-11-27 2015-04-10 대우조선해양 주식회사 LNG storage tank with BOG reduction device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018185190A1 (en) * 2017-04-04 2018-10-11 Lnt Marine Pte. Ltd. Multi-layered insulation system for liquefied gas carriers
KR20210073936A (en) * 2019-12-11 2021-06-21 삼성중공업 주식회사 Vessel energy efficiency management system using heat of low temperature fuel

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