CN216113357U - LNG boil-off gas reliquefaction system - Google Patents

LNG boil-off gas reliquefaction system Download PDF

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Publication number
CN216113357U
CN216113357U CN202120221238.2U CN202120221238U CN216113357U CN 216113357 U CN216113357 U CN 216113357U CN 202120221238 U CN202120221238 U CN 202120221238U CN 216113357 U CN216113357 U CN 216113357U
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Prior art keywords
boil
gas
lng
heat exchanger
pump
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CN202120221238.2U
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Chinese (zh)
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郑济宪
崔金植
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Chuanbao Unitech Co ltd
Sunbo Industries Co ltd
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Chuanbao Unitech Co ltd
Sunbo Industries Co ltd
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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 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/06—Apparatus for de-liquefying, e.g. by heating
    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
    • 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
    • F17C2265/02—Mixing fluids
    • F17C2265/022—Mixing fluids identical fluid
    • 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
    • F17C2265/031—Treating the boil-off by discharge
    • 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
    • F17C2265/05—Regasification
    • 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
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention relates to an LNG boil-off gas reliquefaction system that can efficiently recycle boil-off gas (BOG) that is wasted even in a medium-and small-sized ship that is not equipped with a separate reliquefaction system, and can save the cost of sailing the medium-and small-sized ship and the cost of refueling the ship, by reliquefying the boil-off gas (BOG) that is generated from Liquefied Natural Gas (LNG) that is widely used as clean fuel a plurality of times using a plurality of heat exchangers.

Description

LNG boil-off gas reliquefaction system
Technical Field
The present invention relates to a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium and small sized Liquefied Natural Gas (LNG) fueled ship, and more particularly, to a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium and small sized Liquefied Natural Gas (LNG) fueled ship, which can reliquefy boil-off gas (BOG) generated from Liquefied Natural Gas (LNG) widely used as clean fuel many times by using a plurality of heat exchangers, can effectively recycle the waste boil-off gas (BOG) even in a medium and small sized ship not equipped with a separate reliquefaction system, and can save the sailing cost and refueling cost of the medium and small sized ship.
Background
In general, since Liquefied Natural Gas (LNG) can reduce emissions of harmful substances such as SOx, NOx, and carbon dioxide and greenhouse gases as compared with conventional fossil fuels, it is widely used as a clean fuel and has been widely used not only on land but also in the marine, i.e., shipbuilding, and marine fields.
Liquefied Natural Gas (LNG) exists in an ultra-low temperature liquid state of-162 ℃ under atmospheric pressure conditions, and is supplied to various demand locations after being stored inside an ultra-low temperature tank. For reference, the pressure of the main pipe supply pipe network of natural gas connected to the main demand location in each country is the same in each part, but is typically controlled within the range of 70-120 bar.
Although the Liquefied Natural Gas (LNG) stored inside the storage tank suppresses heat inflow by using a heat insulating material, heat inflow inevitably occurs because of a temperature difference between the atmospheric temperature and the inside of the tank, and recently about 0.15% vol% of the Liquefied Natural Gas (LNG) is vaporized every day in a membrane tank used on a ship with the development of a heat insulating technology. The boil-off gas that has been vaporized is compressed by a boil-off gas (BOG) compressor, and the Liquefied Natural Gas (LNG) stored in the tank is vaporized and sent out after being pressurized to the pressure of the main pipe supply pipe network by a low-pressure pump and a high-pressure pump.
The boil-off gas reliquefaction apparatus is an apparatus for cooling/liquefying boil-off gas (BOG) by using Sub-cooled Sensible heat (Sensible heat) of the Liquefied Natural Gas (LNG) by directly contacting the Liquefied Natural Gas (LNG) subjected to the 1 st pressure increase by the low-pressure pump and the pressurized boil-off gas (BOG) with each other. Finally, the Liquefied Natural Gas (LNG) liquefied from boil-off gas (BOG) is transferred to a high-pressure pump.
The boil-off gas reliquefaction apparatus as described above is provided in a large-sized Liquefied Natural Gas (LNG) carrier, but has a problem in that it is difficult to provide a related facility in a small-sized and medium-sized Liquefied Natural Gas (LNG) fueled ship because of its limited scale.
Therefore, there is an urgent need for a reliquefaction apparatus that can efficiently cool the Boil Off Gas (BOG) discarded and reuse it as fuel in a medium-and small-sized Liquefied Natural Gas (LNG) fueled ship.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium-to-small Liquefied Natural Gas (LNG) fueled ship, which can effectively reuse waste boil-off gas (BOG) even in a medium-to-small sized ship not equipped with a separate reliquefaction system, and can save the cost for sailing the medium-to-small sized ship and the cost for refueling the ship.
The Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium and small sized Liquefied Natural Gas (LNG) fuel propulsion ship, which is applicable to one embodiment of the present invention, is characterized by comprising: a boil-off gas compressor connected to a Liquefied Natural Gas (LNG) fuel tank, for compressing boil-off gas (BOG) in the LNG fuel tank; an In-tank pump (In-tank pump) which is provided inside a Liquefied Natural Gas (LNG) fuel tank and pressurizes and supplies the Liquefied Natural Gas (LNG) fuel to an engine; a booster pump connected to the in-tank pump, for pressurizing Liquefied Natural Gas (LNG) fuel supplied from the in-tank pump to a required pressure required by the engine and supplying the pressurized LNG fuel to the engine; a 1 st heat exchanger disposed between the in-tank pump and the pressurizing pump, for cooling the boil-off gas by heat exchange between Liquefied Natural Gas (LNG) fuel supplied from the in-tank pump and the boil-off gas supplied from the boil-off gas compressor; and a 2 nd heat exchanger disposed between the booster pump and the boil-off gas compressor, for cooling the boil-off gas by heat exchange between Liquefied Natural Gas (LNG) fuel supplied from the booster pump and the boil-off gas supplied from the boil-off gas compressor; wherein the boil-off gas compressed by the boil-off gas compressor is cooled 1 st time by the 2 nd heat exchanger, then cooled 2 nd time by the 1 st heat exchanger, and then supplied to the engine direction by the pressurizing pump.
In one embodiment, the present invention is characterized by further comprising: and a 3 rd heat exchanger for additionally cooling the boil-off gas compressed by the boil-off gas compressor by exchanging heat between the boil-off gas supplied to the boil-off gas compressor and the boil-off gas compressed by the boil-off gas compressor.
In one embodiment, the present invention is characterized by further comprising: and an additional compressor for the boil-off gas, wherein the boil-off gas compressed by the boil-off gas compressor is recompressed.
In one embodiment, the present invention is characterized by further comprising: and a booster pump which is disposed between the in-tank pump and the 1 st heat exchanger and which additionally pressurizes the Liquefied Natural Gas (LNG) fuel pressurized by the in-tank pump.
In one embodiment, the utility model features: a vaporizer for vaporizing the Liquefied Natural Gas (LNG) fuel heat-exchanged by the 2 nd heat exchanger is provided between the 2 nd heat exchanger and the engine.
In one embodiment, the utility model features: the 1 st heat exchanger supplies the cooled boil-off gas to a pipeline connecting the in-tank pump and the 1 st heat exchanger, thereby mixing the boil-off gas with Liquefied Natural Gas (LNG) fuel supplied by the in-tank pump.
In one embodiment, the utility model features: the 1 st heat exchanger mixes the cooled boil-off gas with Liquefied Natural Gas (LNG) fuel supplied by the in-tank pump.
An aspect of the present invention is to effectively recycle boil-off gas (BOG) discarded even in a small and medium-sized ship not equipped with a separate reliquefaction system by reliquefying the BOG a plurality of times using a plurality of heat exchangers.
In addition, another aspect of the present invention can effectively reliquefy boil-off gas and reuse it as fuel without restriction of sailing conditions in a medium-small sized Liquefied Natural Gas (LNG) fueled ship using naturally occurring boil-off gas, thereby saving the sailing cost of the ship and the refueling cost of the ship.
Drawings
Fig. 1 is a schematic diagram illustrating a configuration of a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system 100 for a medium-to-small Liquefied Natural Gas (LNG) fueled ship to which an embodiment of the present invention is applied.
Fig. 2 is a schematic diagram illustrating another embodiment of the 1 st heat exchanger 140 illustrated in fig. 1.
Fig. 3 is a schematic diagram illustrating a process of reliquefying Liquefied Natural Gas (LNG) boil-off gas using the Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium-to-small sized Liquefied Natural Gas (LNG) fueled propulsion ship illustrated in fig. 1 in a series of order.
Description of the reference numerals
100: liquefied Natural Gas (LNG) boil-off gas reliquefaction system for medium and small-sized LNG (LNG) fuel propelled ship
110: evaporation gas compressor
120: in-tank pump
130: pressure pump
140: the 1 st heat exchanger
150: 2 nd heat exchanger
160: no. 3 heat exchanger
170: additional compressor for evaporation gas
180: booster pump
190: gasification machine
Detailed Description
Next, preferred embodiments will be described to help understanding of the present invention. However, the following examples are provided only to aid understanding of the present invention, and the contents of the present invention are not limited thereto.
Fig. 1 is a schematic diagram illustrating a configuration of a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system 100 for a medium-to-small Liquefied Natural Gas (LNG) fueled ship to which an embodiment of the present invention is applied.
Referring to fig. 1, a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system 100 for a medium-to-small sized Liquefied Natural Gas (LNG) fueled ship to which an embodiment of the present invention is applied may generally include a boil-off gas compressor 110, an in-tank pump 120, a booster pump 130, a 1 st heat exchanger 140, and a 2 nd heat exchanger 150.
In an additional embodiment, the system may further include a 3 rd heat exchanger 160, an additional vapor compressor 170, an additional pump 180, and a vaporizer 190.
First, the boil-off gas compressor 110 is connected to the Liquefied Natural Gas (LNG) fuel tank 10, and functions to increase the temperature of the low-pressure boil-off gas (BOG) generated inside the Liquefied Natural Gas (LNG) fuel tank 10 by pressurizing and compressing the BOG.
In particular, boil-off gas compressor 110 may raise the temperature of the boil-off gas to a temperature in the range of 100 degrees celsius to 150 degrees celsius by compressing the low pressure boil-off gas at a pressure in the range of 30barg to 100barg, preferably at a pressure equivalent to 50 barg. The boil-off gas as described above may be heat-exchanged by the 1 st and 2 nd heat exchangers 140 and 150 in a subsequent process, thereby being cooled to a subzero temperature of-130 to-155 degrees and liquefied.
The In-tank pump (In-tank pump)120 is provided inside a Liquefied Natural Gas (LNG) fuel tank, and functions to pressurize the Liquefied Natural Gas (LNG) fuel and supply the pressurized LNG fuel to a pressurizing pump 130 described later. At this time, the pressure value at which the Liquefied Natural Gas (LNG) fuel is pressurized by the in-tank pump 120 corresponds to the pressure value required by the pressurization pump 130.
The pressurization pump 130 is connected to the in-tank pump 120, and serves to additionally pressurize the pressurized Liquefied Natural Gas (LNG) fuel supplied by the in-tank pump 120 to a pressure required by the engine and supply the pressurized LNG fuel to the engine.
The 1 st heat exchanger 140 is located between the in-tank pump 120 and the pressurizing pump 130, and serves to cool the boil-off gas by heat exchange between the cold heat of the pressurized Liquefied Natural Gas (LNG) fuel supplied from the in-tank pump 120 and the boil-off gas supplied from the boil-off gas compressor 110.
At this time, the boil-off gas supplied by the boil-off gas compressor 110 corresponds to the boil-off gas subjected to the 1 st cooling by the 2 nd heat exchanger 150 described later. That is, the 1 st heat exchanger 140 may convert the boil-off gas into Liquefied Natural Gas (LNG) fuel in a liquefied state by performing 2 nd additional cooling on the boil-off gas subjected to the 1 st cooling by the 2 nd heat exchanger 150, which will be described later.
The boil-off gas (liquefied state) additionally cooled 2 nd time by the 1 st heat exchanger 140 is supplied again to the engine direction by the pressurizing pump 130.
At this time, the 1 st heat exchanger 140 supplies the cooled boil-off gas to a pipeline connecting the in-tank pump 120 and the 1 st heat exchanger 140 to each other, thereby mixing with the Liquefied Natural Gas (LNG) fuel supplied to the direction of the pressurizing pump 130 by the in-tank pump 120.
Therefore, the evaporation gas after 2 nd cooling can be directly used as fuel of the engine.
The 1 st heat exchanger 140 may supply the boil-off gas subjected to the 2 nd additional cooling to the pipe line connecting the in-tank pump 120 and the 1 st heat exchanger 140 to each other, but the boil-off gas is not supplied to the 1 st heat exchanger 140 from the outside of the 1 st heat exchanger 140 but is supplied to the pressurizing pump 130 by itself in the 1 st heat exchanger 140, which will be described in detail with reference to fig. 2.
Fig. 2 is a schematic diagram illustrating another embodiment of the 1 st heat exchanger 140 illustrated in fig. 1.
Referring to fig. 2, the 1 st heat exchanger 140 illustrated in fig. 2 is different from the 1 st heat exchanger 140 illustrated in fig. 1 in that the boil-off gas subjected to the 2 nd additional cooling is supplied to a pipeline connecting the in-tank pump 120 and the 1 st heat exchanger 140 to each other, but is not supplied from the outside of the 1 st heat exchanger 140 but is supplied from the inside thereof.
That is, the 1 st heat exchanger 140 illustrated in fig. 1 mixes the additionally cooled boil-off gas with the Liquefied Natural Gas (LNG) fuel supplied from the in-tank pump 120 through a pipe connected to the outside of the 1 st heat exchanger 140, but the 1 st heat exchanger 140 illustrated in fig. 2 mixes the additionally cooled boil-off gas with the Liquefied Natural Gas (LNG) fuel supplied from the in-tank pump 120 through a pipe connected to the inside of the 1 st heat exchanger 140.
In this case, the temperature of the additional cooled boil-off gas does not increase due to the outside temperature of the 1 st heat exchanger 140, and therefore, the efficiency thereof can be maximized.
Referring back to fig. 1, the 2 nd heat exchanger 150 is located between the pressurizing pump 130 and the boil-off gas compressor 110, and may perform a 1 st cooling of the boil-off gas by heat exchange between cold and heat of the pressurized Liquefied Natural Gas (LNG) fuel supplied from the pressurizing pump 130 and the boil-off gas supplied from the boil-off gas compressor 110. That is, after the 2 nd heat exchanger 150 first cools the boil-off gas, the 1 st heat exchanger 140 may further cool the boil-off gas as described above.
The process of cooling the boil-off gas by the 1 st and 2 nd heat exchangers 140 and 150 as described above will be described in more detail with reference to fig. 3.
In the present invention, the method further comprises: the 3 rd heat exchanger 160 additionally cools the boil-off gas compressed by the boil-off gas compressor 110 by using the cooling heat of the boil-off gas supplied from the Liquefied Natural Gas (LNG) fuel tank 10 to the boil-off gas compressor 110.
The 3 rd heat exchanger 160 is disposed on both a pipeline connecting the Liquefied Natural Gas (LNG) fuel tank 10 and the boil-off gas compressor 110 and a pipeline connecting the boil-off gas compressor 110 and the 2 nd heat exchanger 150.
Thereby, the boil-off gas supplied to the 2 nd heat exchanger 150 through the boil-off gas compressor 110 is cooled by the cold heat of the boil-off gas passing through the 3 rd heat exchanger 160 from the Liquefied Natural Gas (LNG) fuel tank 10.
Further, in an embodiment, the present invention may include an evaporation gas additional compressor 170 for further compressing the evaporation gas compressed by the evaporation gas compressor 110.
The boil-off gas supplementary compressor 170 may function to re-compress and re-supply the remaining boil-off gas, which is not used in a DF engine (DFGE) using natural gas as fuel, to the boil-off gas compressor 110 at a demand location for compressing the boil-off gas. In the case as described above, it is possible to improve the reliquefaction efficiency and the reliquefaction amount by further increasing the pressure of the reliquefied boil-off gas.
For example, when the pressure of the boil-off gas is about 150 to 170bar, the reliquefaction amount will be at a maximum, and the boil-off gas additional compressor 170 may additionally compress the boil-off gas compressed by the boil-off gas compressor 110 to have a pressure of 150 to 170 bar.
Further, in an embodiment, the present invention may include a booster pump 180 for additionally pressurizing Liquefied Natural Gas (LNG) fuel pressurized by the in-tank pump 120 between the in-tank pump 120 and the 1 st heat exchanger 140. The booster pump 180 may further pressurize the Liquefied Natural Gas (LNG) fuel pressurized by the in-tank pump 120, thereby supplying the Liquefied Natural Gas (LNG) fuel of high pressure (e.g., 300barg) into the 1 st heat exchanger 140.
In addition, in an embodiment, the present invention may include a vaporizer 190 for vaporizing Liquefied Natural Gas (LNG) fuel that is heat-exchanged by the 2 nd heat exchanger 150, between the 2 nd heat exchanger 150 and the engine of the ship. At this time, the vaporizer 190 may function to vaporize Liquefied Natural Gas (LNG) fuel pressurized and heat-exchanged by the pressurization pump 130 to a temperature required for the engine. The gasification machine as described above may use high-temperature water or steam as a heat medium.
Next, a reliquefaction process of the boil-off gas of the Liquefied Natural Gas (LNG) will be described in detail in order with reference to fig. 3.
Fig. 3 is a schematic diagram illustrating a process of reliquefying Liquefied Natural Gas (LNG) boil-off gas using the Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a medium-to-small sized Liquefied Natural Gas (LNG) fueled propulsion ship illustrated in fig. 1 in a series of order.
First, in step S301, the boil-off gas discharged from the Liquefied Natural Gas (LNG) fuel tank 10 is compressed by the boil-off gas compressor 110 connected to the LNG fuel tank 10.
Next, in step S302, the Liquefied Natural Gas (LNG) fuel is pressurized by the in-tank pump 120 provided inside the Liquefied Natural Gas (LNG) fuel tank 10, and then the required pressure required for the engine is formed by the pressurization pump 130 connected to the in-tank pump 120 and supplied to the engine.
Next, in step S303, the Liquefied Natural Gas (LNG) fuel supplied by the booster pump 130 and the boil-off gas supplied by the boil-off gas compressor 110 are heat-exchanged with each other by the 2 nd heat exchanger 150 provided between the boil-off gas compressor 110 and the booster pump 130, thereby performing the 1 st cooling of the boil-off gas.
Next, in step S304, the Liquefied Natural Gas (LNG) fuel supplied by the in-tank pump 120 and the boil-off gas subjected to the 1 st cooling by the 2 nd exchanger are heat-exchanged with each other by the 1 st heat exchanger 140 provided between the pressurizing pump 130 and the in-tank pump 120, so that the boil-off gas is subjected to the 2 nd cooling and supplied to the Liquefied Natural Gas (LNG) fuel tank 130.
As described above, according to the present invention, the boil-off gas (BOG) discarded can be effectively reused even in a medium or small sized ship not equipped with a separate reliquefaction system by performing the 1 st and 2 nd reliquefaction of the boil-off gas inside the Liquefied Natural Gas (LNG) fuel tank 10 using the 1 st heat exchanger 140 and the 2 nd heat exchanger 150.
While the present invention has been described in detail with reference to the preferred embodiments, those skilled in the relevant art will recognize that the utility model can be practiced with modification and alteration within the spirit and scope of the appended claims.

Claims (6)

1. An LNG boil-off gas reliquefaction system, comprising:
a boil-off gas compressor connected to an LNG fuel tank, for compressing boil-off gas in the LNG fuel tank;
an in-tank pump disposed inside the LNG fuel tank, for pressurizing the LNG fuel and supplying the pressurized LNG fuel to the engine;
a pressurization pump connected to the in-tank pump, for pressurizing the LNG fuel supplied from the in-tank pump to a required pressure required by the engine and supplying the LNG fuel to the engine;
a 1 st heat exchanger disposed between the in-tank pump and the pressurizing pump, for cooling the boil-off gas by heat exchange between the LNG fuel supplied from the in-tank pump and the boil-off gas supplied from the boil-off gas compressor; and the number of the first and second groups,
a 2 nd heat exchanger disposed between the booster pump and the boil-off gas compressor, for cooling the boil-off gas by heat exchange between the LNG fuel supplied from the booster pump and the boil-off gas supplied from the boil-off gas compressor;
wherein the boil-off gas compressed by the boil-off gas compressor is cooled 1 st time by the 2 nd heat exchanger, then cooled 2 nd time by the 1 st heat exchanger, and supplied to the engine direction by the pressurizing pump,
the first heat exchanger 1 described above is provided with,
the cooled boil-off gas is supplied to a line connecting the in-tank pump and the 1 st heat exchanger to be mixed with the LNG fuel supplied by the in-tank pump.
2. The LNG boil-off gas reliquefaction system of claim 1, further comprising:
a 3 rd heat exchanger for performing heat exchange between the boil-off gas supplied to the boil-off gas compressor and the boil-off gas compressed by the boil-off gas compressor,
thereby additionally cooling the boil-off gas compressed by the boil-off gas compressor.
3. The LNG boil-off gas reliquefaction system of claim 1, further comprising:
and an additional compressor for the boil-off gas, wherein the boil-off gas compressed by the boil-off gas compressor is recompressed.
4. The LNG boil-off gas reliquefaction system of claim 1, further comprising:
and a booster pump which is disposed between the tank pump and the 1 st heat exchanger and which additionally pressurizes the LNG fuel pressurized by the tank pump.
5. The LNG boil-off gas reliquefaction system of claim 1, wherein:
between the 2 nd heat exchanger and the engine,
a vaporizer for vaporizing the LNG fuel heat-exchanged by the 2 nd heat exchanger.
6. The LNG boil-off gas reliquefaction system of claim 1, wherein:
the first heat exchanger 1 described above is provided with,
the cooled boil-off gas is mixed with LNG fuel supplied by the in-tank pump.
CN202120221238.2U 2020-03-02 2021-01-27 LNG boil-off gas reliquefaction system Active CN216113357U (en)

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KR1020200026079A KR102388679B1 (en) 2020-03-02 2020-03-02 Lng boil-off re-liquefaction system for small and medium lng fuel propulsion ships and method to re-liquefaction lng boil-off using therefore
KR10-2020-0026079 2020-03-02

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JP3586501B2 (en) * 1995-08-25 2004-11-10 株式会社神戸製鋼所 Cryogenic liquid and boil-off gas processing method and apparatus
US8028724B2 (en) * 2007-02-12 2011-10-04 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and unloading of LNG from the tank
KR102632391B1 (en) * 2016-12-28 2024-02-01 한화오션 주식회사 Fuel supply system for ship
KR20180093405A (en) 2017-02-13 2018-08-22 대우조선해양 주식회사 Method of BOG Reliquefaction
KR20190081519A (en) * 2017-12-29 2019-07-09 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel
KR102110325B1 (en) * 2018-02-14 2020-05-13 주식회사 동화엔텍 Reliquefaction system of boil-off gas for ship

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