KR101750890B1 - Apparatus for reliquefaction of boil off gas in liquefied gas carrier - Google Patents
Apparatus for reliquefaction of boil off gas in liquefied gas carrier Download PDFInfo
- Publication number
- KR101750890B1 KR101750890B1 KR1020150042267A KR20150042267A KR101750890B1 KR 101750890 B1 KR101750890 B1 KR 101750890B1 KR 1020150042267 A KR1020150042267 A KR 1020150042267A KR 20150042267 A KR20150042267 A KR 20150042267A KR 101750890 B1 KR101750890 B1 KR 101750890B1
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- South Korea
- Prior art keywords
- gas
- tank
- compressor
- fuel
- liquefied
- Prior art date
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Classifications
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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
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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
- 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
- F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
- F17C2227/0348—Water 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
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/0439—Temperature
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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
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
-
- 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
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with 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
- 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
An evaporative gas re-liquefying apparatus for a liquefied gas carrier is disclosed.
According to one embodiment of the present invention, a first tank in which a first gas used as fuel is stored in a liquefied state; A fuel gas vaporizer installed between the first tank and the engine to vaporize the first gas and supply the gas to the engine; A second tank in which the transporting second gas is stored in a liquefied state; A compressor for compressing the evaporated gas vaporized in the second tank and supplying the compressed gas to the fuel gas vaporizer; A liquid recovery pipe that recovers the evaporated gas provided by the compressor to the second tank when the evaporated gas provided by the compressor is cooled and liquefied by the fuel gas vaporizer; And a heat exchanger for heat-exchanging evaporation gas discharged from a downstream end of the compressor with evaporation gas input to a front end of the compressor to supply the evaporated gas to the fuel gas vaporizer.
Description
The present invention relates to an evaporative gas re-liquefying apparatus for a liquefied gas carrier.
Generally, the liquefied gas can be carried in a gaseous state via land or sea gas piping, or in a liquefied state and stored in a liquefied gas carrier, to be transported to a distant consumer.
Liquefied gas such as LNG or LPG is obtained by cooling natural gas or petroleum gas at a very low temperature (approximately -163 ° C. in the case of LNG), and its volume is significantly reduced compared to when it is in a gaseous state, .
The liquefied gas carrier is for carrying the liquefied gas and operating the sea for unloading the liquefied gas to the onshore target, and for this purpose, it may include a storage tank capable of withstanding the cryogenic temperature of the liquefied gas. Examples of the offshore structure having the storage tank capable of storing the liquefied gas at such a low temperature state include ships such as LNG RV (Regasification Vessel), LNG FSRU (Floating Storage and Regasification Unit), LNG FPSO (Floating, Production, Storage and off-loading), and the like.
LNG RV is a LNG regasification facility installed on a liquefied gas carrier capable of self-sailing and floating, and LNG FSRU stores liquefied natural gas unloaded from LNG carrier in offshore sea, in storage tank, It is an offshore structure that supplies natural gas to the demand of the land by vaporizing.
LNG FPSO is an offshore structure that is used to purify mined natural gas from the sea, directly liquefy it, store it in a storage tank, and transfer LNG stored in this storage tank to LNG transport, if necessary. In the present specification, the term "offshore structure" includes not only liquefied gas carrier, LNG RV, but also LNG FPSO and LNG FSRU.
Since the liquefaction temperature of natural gas is a cryogenic temperature of about -163 ° C at normal pressure, LNG is evaporated even if its temperature is slightly higher than -163 ° C at normal pressure. For example, in the case of a conventional LNG carrier, the LNG storage tank of the LNG carrier is heat-treated, but since the external heat is continuously transferred to the LNG, LNG is transported by the LNG carrier, It is continuously vaporized in the LNG storage tank, and the boil-off gas (BOG) may be generated in the LNG storage tank.
The generated evaporation gas increases the pressure in the storage tank and accelerates the flow of the liquefied gas in accordance with the shaking motion of the ship, which may cause a structural problem, so it is necessary to suppress the generation of the evaporation gas.
In order to suppress the evaporation gas in the storage tank of the liquefied gas carrier, conventionally, a method of discharging the evaporation gas to the outside of the storage tank and incinerating it, a method of discharging the evaporation gas to the outside of the storage tank, And then returning to the storage tank, a method of using evaporation gas as the fuel used in the propulsion engine of the ship, and a method of suppressing the generation of evaporation gas by keeping the internal pressure of the storage tank high.
In the case of a conventional liquefied gas carrier equipped with an evaporation gas remelting device, in order to maintain an appropriate pressure of the storage tank, the evaporation gas inside the storage tank is discharged to the outside of the storage tank and re-liquefied through the re-liquefaction device. The evaporation gas is compressed to a low pressure and supplied to the re-liquefier. The compressed evaporated gas is re-liquefied by heat exchange with the nitrogen cooled at the cryogenic temperature in a liquefaction device comprising a nitrogen refrigeration cycle and then returned to the storage tank.
However, in the conventional evaporation gas remelting device, there is a disadvantage in that a separate gas (for example, nitrogen gas) for heat exchange is required in order to re-liquefy the evaporation gas. When the amount of evaporation gas required for re- And the space of the ship is restricted.
In addition, in the case of a ship using LNG as a fuel in recent years, the liquefaction of evaporated gas is realized by using the low temperature of LNG. However, in this case, the liquefaction efficiency is low and when the amount of evaporated gas is large, There is a problem that the unstable evaporation gas is discharged outboard.
An embodiment of the present invention is to provide an evaporation gas re-liquefying apparatus for a liquefied gas carrier which can increase the efficiency of re-liquefaction of a liquefied gas carrier and recover the evaporated gas without releasing it to the outside of the ship, as much as possible.
Further, the embodiment of the present invention can improve the engine performance by improving the vaporization performance by raising the temperature of the fuel gas supplied to the engine through the heat exchange when the liquefied gas is re-liquefied in the carrier using another liquefied gas as the fuel gas And to provide an evaporating gas re-liquefying apparatus for a liquefied gas carrier.
According to an aspect of the present invention, there is provided a fuel cell system comprising: a first tank in which a first gas used as fuel is stored in a liquefied state; A fuel gas vaporizer installed between the first tank and the engine to vaporize the first gas and supply the gas to the engine; A second tank in which the transporting second gas is stored in a liquefied state; A compressor for compressing the evaporated gas vaporized in the second tank and supplying the compressed gas to the fuel gas vaporizer; A liquid recovery pipe that recovers the evaporated gas provided by the compressor to the second tank when the evaporated gas provided by the compressor is cooled and liquefied by the fuel gas vaporizer; And a heat exchanger for heat-exchanging the evaporated gas discharged from the downstream end of the compressor with the evaporated gas input to the upstream side of the compressor to supply the evaporated gas to the fuel gas vaporizer.
A cooling water heat exchanger for further lowering the temperature of the evaporation gas may be installed between the compressor and the heat exchanger.
A first gas heater installed between the compressor and the heat exchanger for increasing the temperature of the first gas through heat exchange with the evaporation gas at a rear end of the compressor having a temperature and a pressure increased; A bypass pipe that branches from a main pipe connecting the rear end of the fuel gas vaporizer and the engine and is connected to the first gas and is supplied with the first gas whose temperature has been raised through the first gas heater, . ≪ / RTI >
The main pipe located behind the branch point of the bypass pipe may be provided with a first flow rate valve for regulating the flow rate of the first gas, and a second flow rate valve may be installed in the bypass pipe.
A temperature sensor installed at a downstream end of the first gas discharge pipe and measuring a temperature of the first gas; And a controller for receiving the signal from the temperature sensor and closing the second flow rate control valve when the temperature of the first gas is lower than a predetermined value.
And a gas heater portion for raising the temperature of the first gas supplied to the engine may be provided at a rear end of the first flow control valve in the main pipe.
Further, a flash tank for separating gaseous flash gas which has not been liquefied in the fuel gas vaporizer may be installed in the liquid recovery pipe.
According to another aspect of the present invention, there is provided a fuel cell system comprising: a fuel supply line for vaporizing liquid fuel in a first tank to supply the liquid fuel to an engine; A re-liquefaction line for re-liquefying the evaporated gas (BOG) generated in the second tank and supplying it to the second tank; A fuel gas vaporizer provided at an intersection of the fuel supply line and the refill liquor line for exchanging heat between the liquid fuel and the evaporative gas (BOG) to vaporize the liquid fuel and liquefy the evaporated gas (BOG); And a heat exchanger provided at a point of intersection of the refueling line and cooling the evaporation gas (BOG) supplied to the fuel gas vaporizer.
According to the embodiment of the present invention, as the evaporation gas evaporated in the liquefied gas is cooled in multiple stages and the liquefaction efficiency of the liquefied gas is increased, the evaporation gas can be recovered through the liquefaction as much as possible without discharging it to the outside.
Further, the engine performance can be improved by improving the vaporization performance by raising the temperature of the fuel gas supplied to the engine through the heat exchange when the liquefied gas is re-liquefied in the carrier using another liquefied gas as the fuel gas.
Brief Description of the Drawings Fig. 1 is a schematic view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a first embodiment of the present invention;
FIG. 2 is a view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a second embodiment of the present invention;
3 is a schematic view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a third embodiment of the present invention.
4 is a schematic view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a fourth 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.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a structural view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a first embodiment of the present invention, and FIG. 2 is a view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a second embodiment of the present invention FIG.
Referring to FIGS. 1 and 2, an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a first embodiment of the present invention includes a
In the
The
Generally, the liquefied gas is vaporized when it absorbs heat. The
The
Meanwhile, although the second gas is stored in the
It is preferable that the evaporation gas is removed as soon as it is evaporated as described above and the volume is greatly expanded and the internal pressure of the
Meanwhile, the
The
Accordingly, the second gas, which has been heat-exchanged with the first gas in the
At this time, the
The
Referring to FIG. 2, a second embodiment of the present invention includes a
The cooling
Generally, the cooling water is variously provided to the ship, and therefore, it may be used as it is, or cooling water for cooling the
According to the second embodiment of the present invention, in addition to the
A third embodiment of the present invention will be described below with reference to Fig.
FIG. 3 is a configuration diagram showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a third embodiment of the present invention. As shown in FIG. 3, the third embodiment of the present invention may further include a
The
The
The temperature of the evaporated gas passing through the
Accordingly, the first gas vaporized through the
The
Accordingly, if the vaporization rate of the first gas passing through the
In addition, the third embodiment of the present invention may further include a
The
When the temperature of the first gas is lower than a predetermined value, the
A
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a view showing an evaporative gas re-liquefying apparatus for a liquefied gas carrier according to a fourth embodiment of the present invention. As shown in FIG. 4, the fourth embodiment of the present invention may further include a
The
The second gas that has passed through the
The flash gas stored in the
On the other hand, the fifth embodiment of the present invention will be described with reference to FIG.
1, the fifth embodiment of the present invention may include a fuel supply line L1, a refueling line L2, a
The fuel supply line L1 vaporizes the liquid fuel in the
The re-liquefaction line (L2) re-liquefies the evaporation gas (BOG) generated in the second tank (300) and supplies it again to the second tank (300) The
The
The
Here, the detailed description of the above configurations applies to the first embodiment of the present invention.
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.
1: engine
100: first tank 200: fuel gas vaporizer
210: main pipe 211: first flow valve
300: Second tank 400: Compressor
500: liquid recovery pipe 600: heat exchanger
700: cooling water heat exchanger 800: first gas heat exchanger
810: bypass pipe 811: second flow valve
820: Temperature sensor 830:
840: gas heater part 900: flash tank
L1: fuel supply line L2: refueling line
Claims (7)
A fuel gas vaporizer installed between the first tank and the engine to vaporize the first gas and supply the gas to the engine;
A second tank in which the transporting second gas is stored in a liquefied state;
A compressor for compressing the evaporated gas vaporized in the second tank and supplying the compressed gas to the fuel gas vaporizer;
A liquid recovery pipe that recovers the evaporated gas provided by the compressor to the second tank when the evaporated gas provided by the compressor is cooled and liquefied by the fuel gas vaporizer;
A heat exchanger for heat-exchanging evaporative gas discharged from a downstream end of the compressor with evaporative gas input to a front end of the compressor, and supplying the evaporated gas to the fuel gas vaporizer;
A first gas heater installed between a rear end of the compressor and the heat exchanger for raising the temperature of the first gas through heat exchange with the evaporation gas at a rear end of the compressor in which temperature and pressure are increased; And
A bypass pipe that branches from a main pipe connecting the rear end of the fuel gas vaporizer and the engine and is connected to the first gas and is supplied with the first gas whose temperature has been raised through the first gas heater, ;
And an evaporation gas re-liquefying device for evaporating the gas in the liquefying gas carrier.
And a cooling water heat exchanger for further lowering the temperature of the evaporation gas is provided between the rear end of the compressor and the heat exchanger.
A first flow rate valve for regulating the flow rate of the first gas is provided in the main pipe located behind the branch point of the bypass pipe and a second flow rate valve is provided in the bypass pipe, Liquefaction device.
A temperature sensor installed at a downstream end of the first gas discharge pipe in the bypass pipe and measuring a temperature of the first gas; And
A control unit for receiving the signal of the temperature sensor and closing the second flow rate valve when the temperature of the first gas is less than a preset value;
And an evaporation gas re-liquefying device for liquefying the gas carrier.
And a gas heater portion for raising the temperature of the first gas supplied to the engine is provided at a rear end of the first flow rate valve in the main pipe.
Wherein the liquid recovery pipe is provided with a flash tank for separating gaseous flash gas which has not been liquefied in the fuel gas vaporizer.
Priority Applications (1)
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KR1020150042267A KR101750890B1 (en) | 2015-03-26 | 2015-03-26 | Apparatus for reliquefaction of boil off gas in liquefied gas carrier |
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KR1020150042267A KR101750890B1 (en) | 2015-03-26 | 2015-03-26 | Apparatus for reliquefaction of boil off gas in liquefied gas carrier |
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KR20160115147A KR20160115147A (en) | 2016-10-06 |
KR101750890B1 true KR101750890B1 (en) | 2017-07-03 |
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KR101957091B1 (en) * | 2018-01-29 | 2019-03-11 | 동아대학교 산학협력단 | Lng fuel supply system utilizing phase changing fluid |
CN109404079A (en) * | 2018-11-27 | 2019-03-01 | 大连理工大学 | A kind of BOG for LNG receiving station is condensed and LNG cold energy generation integrated system again |
Citations (1)
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KR101356004B1 (en) * | 2012-10-24 | 2014-02-05 | 대우조선해양 주식회사 | Method for treating boil-off gas for a ship |
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KR20120107832A (en) | 2011-03-22 | 2012-10-04 | 대우조선해양 주식회사 | System and method for supplying fuel for high pressure natural gas injection engine |
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KR101356004B1 (en) * | 2012-10-24 | 2014-02-05 | 대우조선해양 주식회사 | Method for treating boil-off gas for a ship |
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