KR20160142159A - Device and method for BOG re-liquefaction - Google Patents
Device and method for BOG re-liquefaction Download PDFInfo
- Publication number
- KR20160142159A KR20160142159A KR1020150078143A KR20150078143A KR20160142159A KR 20160142159 A KR20160142159 A KR 20160142159A KR 1020150078143 A KR1020150078143 A KR 1020150078143A KR 20150078143 A KR20150078143 A KR 20150078143A KR 20160142159 A KR20160142159 A KR 20160142159A
- Authority
- KR
- South Korea
- Prior art keywords
- gas
- compressor
- heat exchanger
- evaporated
- evaporated gas
- Prior art date
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Classifications
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- 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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- 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
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
- F25J1/0025—Boil-off gases "BOG" from storages
-
- 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
- F17C2227/0171—Arrangement
- F17C2227/0185—Arrangement comprising several pumps or compressors
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0358—Heat exchange with the fluid by cooling by expansion
-
- 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
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/01—Purifying the fluid
- F17C2265/015—Purifying the fluid by separating
-
- 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
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
BACKGROUND OF THE
The storage tank for storing liquefied gas such as Natural Liquefied Gas (LNG) or Liquefied Petroleum Gas (LPG) and the like is provided around the inside of the storage tank and the outside of the storage tank Perfect insulation is impossible. Therefore, boil off gas (BOG) is continuously generated in the storage tank due to heat exchange inside and outside the storage tank.
When the evaporation gas is continuously accumulated in the storage tank, the pressure inside the storage tank increases and the safety becomes poor. Since the evaporation gas inside the storage tank accelerates the evaporation of the liquefied gas in the storage tank, It will accelerate.
Therefore, it is necessary to discharge or evaporate the evaporated gas to the outside. However, the process of re-liquefaction of such evaporated gas does not occur by itself. Especially, equipment for re-liquefaction of evaporation gas consumes power because it requires energy. Therefore, it is necessary to minimize the energy consumed in the equipment for compressing the evaporative gas in terms of power saving.
On the other hand, the evaporation gas discharged from the storage tank contains not only hydrocarbons but also nitrogen components. Taking liquefied natural gas as an example, the main component of liquefied natural gas is methane, but the evaporative gas discharged from the storage tank contains not only methane but also nitrogen.
Accordingly, an object of the present invention is to provide an apparatus for re-liquefying a vaporized gas discharged from a storage tank, the apparatus including: an evaporator for removing nitrogen contained in the evaporated gas to reduce the amount of evaporated gas to be cooled, There is a reduction.
According to an aspect of the present invention, there is provided an apparatus for re-liquefying an evaporated gas discharged from a storage tank for storing liquefied gas, the apparatus comprising: a compressor for compressing evaporative gas discharged from the storage tank; A heat exchanger provided downstream of the compressor for cooling the evaporated gas discharged from the compressor; And a nitrogen filter for separating nitrogen contained in the evaporated gas from the evaporated gas; An evaporation gas re-liquefying apparatus is provided.
A first expansion means provided downstream of the heat exchanger for decompressing the evaporated gas cooled by the heat exchanger; And a gas-liquid separator provided downstream of the first expansion means, for separating the gas-liquid mixture, which is decompressed through the first expansion means, into a gas and a liquid; As shown in FIG.
A cooler provided downstream of the compressor for cooling the evaporated gas discharged from the compressor; As shown in FIG.
The heat exchanger exchanges the evaporated gas discharged during the compression in the compressor with the mixed gas of the evaporated gas discharged from the storage tank and the mixed gas discharged from the gas-liquid separator to cool the evaporated gas discharged during the compression in the
A second expansion means provided between the first heat exchanger and the second heat exchanger for further reducing the pressure of the evaporated gas cooled by the first heat exchanger to further cool the evaporated gas; As shown in FIG.
Four compressors are provided in series to compress the evaporation gas in four stages or a multi-stage compressor to compress the evaporation gases in four stages.
Said nitrogen filter comprising: a membrane for separating nitrogen from the evaporation gas according to the size of the molecule; . ≪ / RTI >
According to another aspect of the present invention, there is provided an apparatus for re-liquefying an evaporated gas discharged from a storage tank for storing liquefied gas, the apparatus comprising: A nitrogen filter for separating the nitrogen gas from the nitrogen gas; Wherein the nitrogen filter is provided downstream of the compressor for compressing the evaporated gas.
According to another aspect of the present invention, there is provided a method for re-liquefying an evaporated gas discharged from a storage tank storing a liquefied gas, the method comprising: compressing an evaporated gas discharged from the storage tank; Separating nitrogen from the compressed evaporated gas; And an evaporation gas re-liquefaction method.
According to the present invention, it is possible to reduce the power consumption for re-liquefying the evaporation gas. In particular, it is possible to reduce the power consumed in the compressor by reducing the amount of evaporative gas to cool by separating nitrogen from the evaporated gas before the evaporated gas is supplied to the compressor.
1 is a view showing an evaporative gas remelting apparatus according to a first embodiment of the present invention.
2 is a view showing an evaporative gas remelting apparatus according to a second embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention will be described with reference to the embodiments shown in the drawings, but it is to be understood that various modifications and equivalent embodiments may be made by those skilled in the art without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.
FIG. 1 is a view showing an evaporative gas remelting apparatus according to a first embodiment of the present invention, and FIG. 2 is a view showing an evaporating gas remelting apparatus according to a second embodiment of the present invention. As will be described later, the evaporation gas remelting apparatus shown in FIG. 1 uses a separate refrigerant to re-liquefy the evaporation gas, whereas the evaporation gas re-liquefying apparatus shown in FIG. 2 uses the evaporation gas discharged from the storage tank Partial Re-liquefaction device that re-liquefies evaporated gas using cold heat of gas. First, a first embodiment of the present invention will be described with reference to FIG. The liquefied gas stored in the storage tank is not limited to liquefied natural gas but may be a liquefied natural gas such as liquefied petroleum gas (hereinafter, referred to as " liquefied natural gas " It contains all kinds of liquefied gas.
1, the apparatus for liquefying vaporized gas according to the first embodiment of the present invention includes a
The evaporated gas discharged from the storage tank (1) is pressurized while passing through the compressor (10). The pressurized evaporation gas is supplied to the nitrogen filter (40). As described above, nitrogen can be more efficiently separated from the pressurized evaporated gas in the
The nitrogen separated from the
According to the first embodiment of the present invention, the liquefaction performance is improved as compared with the case where the evaporation gas is supplied to the
1 shows a case where the
2 is a view showing an evaporative gas remelting apparatus according to a second embodiment of the present invention. As described above, FIG. 2 shows a partial re-liquefaction apparatus for re-liquefying evaporated gas using the cold heat of the evaporated gas discharged from the storage tank without a separate refrigerant, unlike FIG.
As shown in FIG. 2, the evaporative gas remelting apparatus according to the second embodiment of the present invention includes a
Downstream of the first to
Further, downstream of the
As shown in FIG. 2, the evaporative gas remelting apparatus according to the second embodiment of the present invention diffuses the evaporated gas discharged from the
Downstream of the second heat exchanger (122) is provided a first expansion means (140) for decompressing and cooling the evaporated gas cooled in the second heat exchanger (122) to produce a vapor-liquid mixture from the evaporated gas, wherein the first expansion means 140), a gas-liquid separator (130) for passing the gas-liquid mixture through the first expansion means (140) and separating the gas-liquid mixture into gas and liquid may be provided.
A second expansion means 142 provided between the
Hereinafter, the operation of the evaporation gas remelting apparatus according to the second embodiment of the present invention will be described with reference to FIG.
The evaporated gas discharged from the
The evaporated gas discharged from the
Meanwhile, the evaporated gas heated in the
2 shows a case where the
1 - Storage tank
10 - Compressor
20 - Heat exchanger
30 - Cooling system
40 - Nitrogen filter
100 - first compressor
102 - Second compressor
104 - third compressor
106 - Fourth compressor
110 - first cooler
112 - second cooler
114 - Third Cooler
116 - Fourth cooler
120 - first heat exchanger
122 - a second heat exchanger
130 - gas-liquid separator
140 - a first expansion means
142 - a second expansion means
150 - Nitrogen filter
Claims (9)
A compressor for compressing the evaporated gas discharged from the storage tank;
A heat exchanger provided downstream of the compressor for cooling the evaporated gas discharged from the compressor; And
A nitrogen filter for separating nitrogen contained in the evaporated gas from the evaporated gas; / RTI >
Evaporating gas remelting device.
A first expansion means provided downstream of the heat exchanger for decompressing the evaporated gas cooled by the heat exchanger; And
A gas-liquid separator provided downstream of the first expansion means, for separating the gas-liquid mixture, which is decompressed through the first expansion means, into a gas and a liquid; ≪ / RTI >
Evaporating gas remelting device.
A cooler provided downstream of the compressor for cooling the evaporated gas discharged from the compressor; ≪ / RTI >
Evaporating gas remelting device.
The heat exchanger
A first heat exchanger which cools the evaporated gas discharged during the compression in the compressor by exchanging heat with the mixed gas of the evaporated gas discharged from the storage tank and the gas discharged from the gas-liquid separator, ; And
A second heat exchanger for heat-exchanging the evaporated gas cooled in the first heat exchanger with the evaporated gas discharged after being compressed in the compressor to cool the evaporated gas discharged after being compressed in the compressor to the last; / RTI >
Evaporating gas remelting device.
A second expansion means provided between the first heat exchanger and the second heat exchanger for further reducing the pressure of the evaporated gas cooled by the first heat exchanger to further cool the evaporated gas; ≪ / RTI >
Evaporating gas remelting device.
The compressor includes:
Four in series, compressing the evaporation gas in four stages,
A multi-stage compressor, comprising:
Evaporating gas remelting device.
Said nitrogen filter comprising: a membrane for separating nitrogen from the evaporation gas according to the size of the molecule; / RTI >
Evaporating gas remelting device.
A nitrogen filter for separating nitrogen contained in the evaporated gas discharged from the storage tank from the evaporated gas; / RTI >
Wherein the nitrogen filter is provided downstream of the compressor for compressing the evaporation gas,
Evaporating gas remelting device.
Compressing the evaporated gas discharged from the storage tank;
Separating nitrogen from the compressed evaporated gas; / RTI >
Evaporation gas re-liquefaction method.
Priority Applications (1)
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KR1020150078143A KR101686513B1 (en) | 2015-06-02 | 2015-06-02 | Device and method for BOG re-liquefaction |
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KR1020150078143A KR101686513B1 (en) | 2015-06-02 | 2015-06-02 | Device and method for BOG re-liquefaction |
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KR20160142159A true KR20160142159A (en) | 2016-12-12 |
KR101686513B1 KR101686513B1 (en) | 2016-12-14 |
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KR1020150078143A KR101686513B1 (en) | 2015-06-02 | 2015-06-02 | Device and method for BOG re-liquefaction |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080057461A (en) * | 2006-12-20 | 2008-06-25 | 신영중공업주식회사 | Lng bog reliquefaction apparatus and method |
KR20110019156A (en) * | 2009-08-19 | 2011-02-25 | 삼성중공업 주식회사 | Liquefied natural gas reliquefaction apparatus |
KR20120103406A (en) * | 2011-03-11 | 2012-09-19 | 대우조선해양 주식회사 | System and method for supplying fuel for high pressure natural gas injection engine |
KR101459962B1 (en) * | 2013-10-31 | 2014-11-07 | 현대중공업 주식회사 | A Treatment System of Liquefied Gas |
-
2015
- 2015-06-02 KR KR1020150078143A patent/KR101686513B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080057461A (en) * | 2006-12-20 | 2008-06-25 | 신영중공업주식회사 | Lng bog reliquefaction apparatus and method |
KR20110019156A (en) * | 2009-08-19 | 2011-02-25 | 삼성중공업 주식회사 | Liquefied natural gas reliquefaction apparatus |
KR20120103406A (en) * | 2011-03-11 | 2012-09-19 | 대우조선해양 주식회사 | System and method for supplying fuel for high pressure natural gas injection engine |
KR101459962B1 (en) * | 2013-10-31 | 2014-11-07 | 현대중공업 주식회사 | A Treatment System of Liquefied Gas |
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