KR20150074519A - Cooling System Using Seawater - Google Patents
Cooling System Using Seawater Download PDFInfo
- Publication number
- KR20150074519A KR20150074519A KR1020130162382A KR20130162382A KR20150074519A KR 20150074519 A KR20150074519 A KR 20150074519A KR 1020130162382 A KR1020130162382 A KR 1020130162382A KR 20130162382 A KR20130162382 A KR 20130162382A KR 20150074519 A KR20150074519 A KR 20150074519A
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- KR
- South Korea
- Prior art keywords
- seawater
- trunk
- fresh water
- fpso
- cooling
- Prior art date
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- 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
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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 seawater cooling system is disclosed. The seawater cooling system of the present invention includes: a fresh water circulation unit in which fresh water for cooling equipment provided in an FPSO is circulated; A seawater trunk provided in the hull of the FPSO and storing seawater that is heat-exchanged with the fresh water circulating in the fresh water circulating unit to cool the fresh water; And a caisson connected to the seawater trunk for receiving seawater and supplying the seawater to the seawater trunk, wherein the seawater is taken from the deep sea by natural pressure and supplied to the seawater trunk.
Description
The present invention relates to a seawater cooling system, and more particularly, to a seawater cooling system that includes a fresh water circulation unit for circulating fresh water for cooling equipment provided in an FPSO, a seawater trunk for storing seawater, To a seawater cooling system for collecting seawater from deep water and cooling the fresh water by exchanging heat with fresh water, including a caisson supplied to the trunk.
Liquefied natural gas (LNG) is a colorless, odorless transparent liquid obtained by cooling and liquefying methane-based natural gas at about -162 ° C. Compared to natural gas, And has a volume of about 1/600.
Such LNG is conventionally produced in a production plant constructed onshore and supplied to the consumer through a carrier. However, due to the recent development of offshore gas fields, it is difficult to transfer natural gas from a land-based gas field to a land-based plant when pipelines transport natural gas. And the development of marine structures equipped with production plants to produce LNG by liquefying natural gas at sea is becoming active.
Floating Liquefied Natural Gas (FLNG) is an offshore structure that floats on the sea and treats LNG. Typically, LNG-FPSO (Floating Production, Storage and Offloading) ) And LNG-FSRU (Floating Storage and Regasification Unit). In particular, LNG-FPSO is a special ship capable of producing LNG, storing and liquefying LNG, and storing and storing LNG with natural gas drilled from offshore gas fields.
Since LNG-FPSO treats production, liquefaction and storage stages at once, it can save time and cost for production and supply of LNG compared to conventional method, and when production is finished in one gas field, it can be moved to another sea gas field Therefore, it is economical.
Such a superstructure of FPSO is equipped with equipment for processing various processes, many of which use fresh water for cooling during the process.
It is easy to take seawater from the FPSO on the sea, but it is not easy to supply. Therefore, fresh water for cooling is provided in a closed loop, and the fresh water used for equipment cooling is cooled again and circulated by a circulation pump provided in the FPSO.
Cooling of fresh water uses seawater which can be easily taken from the sea, and deep sea water with relatively low temperature is used. A submergible pump can be installed inside the caisson of the FPSO for the withdrawal of seawater in the deep sea so that seawater can be taken and supplied for fresh water cooling. Such a submersible pump is expensive, There is a complicated problem.
The present invention solves this problem and proposes a system capable of supplying deep sea water for cooling the freshwater of FPSO by taking deepwater seawater at relatively low cost.
According to an aspect of the present invention, there is provided a clean water circulation unit in which fresh water for cooling equipment provided in an FPSO is circulated;
A seawater trunk provided in the hull of the FPSO and storing seawater that is heat-exchanged with the fresh water circulating in the fresh water circulating unit to cool the fresh water; And
A caisson connected to the seawater trunk for receiving seawater and supplying the seawater to the seawater trunk,
Wherein the seawater is taken from the deep sea and supplied to the seawater trunk.
Preferably, one end of the water intake caisson is located at a depth of 30 to 200 m, and seawater can be collected through the water intake caisson by the pressure difference at both ends.
Preferably, the fresh water circulation unit includes a heat exchange cooler in which the fresh water is cooled by heat exchange with the seawater,
And a seawater supply pump provided in the hull to supply the seawater stored in the seawater trunk to the heat exchange cooler.
Preferably, the seawater supply pump may be a centrifugal pump provided outside the seawater trunk.
According to another aspect of the present invention, there is provided a method of recovering seawater, comprising: 1) taking seawater from deep water and storing it in a seawater trunk of FPSO; And
2) pumping seawater from the seawater trunk to cool the equipment provided in the FPSO and heat exchange with the fresh water to be discharged to cool the fresh water,
And the seawater is collected by the pressure difference between the deep sea and the seawater trunk.
Preferably, a centrifugal pump for pumping seawater may be provided outside the seawater trunk.
The seawater cooling system of the present invention includes a seawater trunk for storing seawater and a caisson for receiving seawater and supplying the seawater to the seawater trunk. The seawater is collected from the deep sea by natural pressure and stored, To supply sea water. By providing the seawater trunk, it is possible to supply seawater for cooling by applying a centrifugal pump which can collect and store deep sea water by natural pressure and is relatively inexpensive and easy to operate. Therefore, it is easy to handle the equipment while reducing the installation cost of the system, and it is possible to stably supply the cooling seawater required for the FPSO by the seawater trunk.
Figure 1 schematically illustrates a portion of a seawater cooling system in accordance with an embodiment of the present invention.
In order to fully understand the operational advantages of the present invention and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which illustrate preferred embodiments of the present invention, and to the contents of the accompanying drawings.
Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.
FIG. 1 schematically shows a part of a seawater cooling system according to an embodiment of the present invention.
1, the seawater cooling system according to the present embodiment includes a fresh water circulation unit (not shown) in which fresh water for cooling equipment provided in FPSO (Floating Production Storage and Offloading) is circulated, A seawater trunk (ST) in which seawater for cooling fresh water is stored by heat exchange with fresh water circulating in the fresh water circulating section, and a seawater trunk (ST) connected to a trunk (ST) and supplied with seawater trunk Caisson (C), the seawater is taken from the deep sea and fed to the seawater trunk (ST).
LNG-FPSO is a special ship capable of producing LNG from natural gas, storing it, and loading and unloading it with LNG carriers. Various modules for LNG production and liquefaction facilities are installed on the topside of FPSO and offloading And the like are also provided. In the processes of LNG production and liquefaction as well as various processes in FPSO, clean water is supplied to cool the equipment. Fresh water is circulated through a clean water circulation part of the present embodiment in a closed loop and supplied for cooling various equipment. The cool water that cools and discharges the equipment is heated by absorbing the heat, and the fresh water is cooled by the sea water and recirculated.
In order to effectively cool the fresh water, it is preferable to take the low temperature seawater and heat-exchange it. In case of seawater, it is preferable to take seawater of deep sea which maintains a relatively stable low temperature because surface temperature varies greatly according to season and latitude and relatively high temperature. Deep seawater of about 200 m in temperature drops to around 2 ° C and maintains the temperature irrespective of the season and latitude.
In order to collect such low temperature seawater, one end of the water receiving caisson (C) is provided so as to be located at a depth of 30 to 200 m, preferably 60 to 100 m, so that seawater at 20 ° C or lower, preferably 17 ° C or lower And stores it in a seawater trunk (ST).
On the other hand, as the water goes down to the deep sea, the water pressure due to seawater increases. Since the pressure increases by 1 atm per 10 m of water, a pressure of about 6 to 10 atm is applied at a depth of 60 to 100 m. Therefore, the seawater is taken in through the water intake caisson (C) by the pressure difference between the deep water pressure at one side end of the water intake caisson (C) and the seawater trunk (ST) Lt; / RTI >
The fresh water circulation unit (not shown) includes a centralized FW /
A
As described above, according to the present embodiment, 1) taking seawater from deep water and storing it in a seawater trunk (ST) of FPSO; 2) Pumping seawater from the seawater trunk (ST), cooling the equipment provided in the FPSO and heat-exchanging it with the fresh water to be discharged, cooling the fresh water to cool and recycle the closed-loop fresh water.
The seawater is collected and stored by the pressure difference between the deep sea and the seawater trunk (ST), and a centrifugal pump for pumping seawater is provided outside the seawater trunk (ST) to supply seawater.
Thus, by providing the seawater trunk ST, seawater can be stably supplied for cooling the fresh water, and the seawater is collected and stored by the pressure difference between the deep sea where the one end of the caisson is located and the seawater trunk ST, There is no electricity consumption for economical. In addition, since the seawater taken in the seawater trunk (ST) is pumped by the centrifugal pump provided outside the trunk, it is possible to reduce the installation cost for preparing a complicated and expensive submersible pump, thereby enhancing the cost competitiveness of the FPSO, This is simple and easy to maintain.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.
F: FPSO hull
ST: Seawater trunk
C: Water intake caisson
100: Seawater supply pump
200: Heat exchange cooler
Claims (6)
A seawater trunk provided in the hull of the FPSO and storing seawater that is heat-exchanged with the fresh water circulating in the fresh water circulating unit to cool the fresh water; And
A caisson connected to the seawater trunk for receiving seawater and supplying the seawater to the seawater trunk,
Wherein the seawater is taken from the deep sea and supplied to the seawater trunk.
Wherein one end of the intake caisson is located at a depth of 30 to 200 m, and seawater is collected through the intake caisson by a pressure difference at both ends.
Wherein the fresh water circulation unit includes a heat exchange cooler in which the fresh water is cooled by heat exchange with the seawater,
And a seawater supply pump provided in the hull to supply the seawater stored in the seawater trunk to the heat exchange cooler.
Wherein the seawater supply pump is a centrifugal pump provided outside the seawater trunk.
2) pumping seawater from the seawater trunk to cool the equipment provided in the FPSO and heat exchange with the fresh water to be discharged to cool the fresh water,
Wherein the seawater is collected by the pressure difference between the deep sea and the seawater trunk.
And a centrifugal pump for pumping seawater is provided outside the seawater trunk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130162382A KR20150074519A (en) | 2013-12-24 | 2013-12-24 | Cooling System Using Seawater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130162382A KR20150074519A (en) | 2013-12-24 | 2013-12-24 | Cooling System Using Seawater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20150074519A true KR20150074519A (en) | 2015-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020130162382A KR20150074519A (en) | 2013-12-24 | 2013-12-24 | Cooling System Using Seawater |
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| Country | Link |
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| KR (1) | KR20150074519A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180044034A (en) | 2016-10-21 | 2018-05-02 | 대우조선해양 주식회사 | Temporary seawater supply system for offshore facility |
-
2013
- 2013-12-24 KR KR1020130162382A patent/KR20150074519A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180044034A (en) | 2016-10-21 | 2018-05-02 | 대우조선해양 주식회사 | Temporary seawater supply system for offshore facility |
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