CN214701458U - LNG boil-off gas reliquefaction system - Google Patents

LNG boil-off gas reliquefaction system Download PDF

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Publication number
CN214701458U
CN214701458U CN202120221241.4U CN202120221241U CN214701458U CN 214701458 U CN214701458 U CN 214701458U CN 202120221241 U CN202120221241 U CN 202120221241U CN 214701458 U CN214701458 U CN 214701458U
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China
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gas
boil
lng
liquefied natural
natural gas
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CN202120221241.4U
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Chinese (zh)
Inventor
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
    • 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 
    • 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 
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/0157—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
    • F17C2227/01—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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a 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
    • F17C2265/03—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
    • F17C2265/03—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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • 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
    • F17C2265/038—Treating the boil-off by recovery with expanding
    • 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
    • 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)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (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 utility model relates to a LNG boil-off gas reliquefaction system, include: 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; by re-liquefying boil-off gas (BOG) generated from Liquefied Natural Gas (LNG) widely used as clean fuel a plurality of times using a plurality of heat exchangers, it is possible to effectively reuse the waste boil-off gas (BOG) even in a medium-sized or small-sized ship not equipped with a separate re-liquefying system, and it is possible to save the cost for sailing the medium-sized or small-sized ship and the cost for refueling the ship.

Description

LNG boil-off gas reliquefaction system
Technical Field
The utility model relates to a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system that is arranged in middle-size and small-size Liquefied Natural Gas (LNG) fuel to impel boats and ships, especially, relate to one kind through utilizing a plurality of heat exchangers to carry out many times reliquefaction from boil-off gas (BOG) that produces in the Liquefied Natural Gas (LNG) that is regarded as clean fuel and is widely used, even can also recycle discarded boil-off gas (BOG) effectively in the middle-size and small-size boats and ships that are not equipped with solitary reliquefaction system, and can also save the navigation cost of middle-size and small-size boats and ships and the Liquefied Natural Gas (LNG) boil-off gas reliquefaction system that is arranged in middle-size and small-size Liquefied Natural Gas (LNG) fuel propulsion boats and ships that is refueled the cost.
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
An object of the present invention is to solve the above-mentioned problems and to provide a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a small and medium-sized Liquefied Natural Gas (LNG) fuel propulsion ship, which can effectively recycle the waste boil-off gas (BOG) even in a small and medium-sized ship not equipped with a separate reliquefaction system, and can save the sailing cost of the small and medium-sized ship and the ship refueling cost.
Be suitable for the Liquefied Natural Gas (LNG) boil-off gas reliquefaction system that is used for middle-size and small-size Liquefied Natural Gas (LNG) fuel to impel boats and ships of an embodiment of the utility model, a serial communication port, include: 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 and then cooled 2 nd time by the 1 st heat exchanger.
In an 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 an 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 an 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 present invention is characterized in that: 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 an embodiment, the present invention is characterized by further comprising: and a flow control valve disposed between the 1 st heat exchanger and the Liquefied Natural Gas (LNG) fuel tank, for expanding the boil-off gas cooled by the 1 st heat exchanger to convert the boil-off gas into Liquefied Natural Gas (LNG) fuel, and then supplying the Liquefied Natural Gas (LNG) fuel to the LNG fuel tank.
In an embodiment, the present invention is characterized by further comprising: and a gas-liquid separator provided between the flow rate control valve and the Liquefied Natural Gas (LNG) fuel tank, for separating the boil-off gas remaining in the Liquefied Natural Gas (LNG) fuel supplied through the flow rate control valve and then re-supplying the separated boil-off gas to the boil-off gas compressor.
The utility model discloses an aspect can carry out many times reliquefaction to boil-off gas (BOG) through utilizing a plurality of heat exchangers, even do not be equipped with in the middle-size and small-size boats and ships of solitary reliquefaction system and also can recycle discarded boil-off gas (BOG) effectively.
Furthermore, the utility model discloses an on the other hand can carry out effectual reliquefaction and recycle it as fuel to boil off gas in the middle-size and small-size Liquefied Natural Gas (LNG) fuel propulsion boats and ships that use the boil off gas of natural production without the restriction of navigation condition to save the navigation cost and the boats and ships refueling cost of boats and ships.
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-and small-sized Liquefied Natural Gas (LNG) fueled ship to which an embodiment of the present invention is applied.
Fig. 2 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
200: flow control valve
210: gas-liquid separator
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 present invention is not limited to the examples.
Fig. 1 is a schematic diagram illustrating a configuration of a Liquefied Natural Gas (LNG) boil-off gas reliquefaction system 100 for a medium-and small-sized 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 and 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 boil-off gas compressor 170, a booster pump 180, a vaporizer 190, a flow control valve 200, and a gas-liquid separator 210.
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 2 nd heat exchanger 150 is located between the booster pump 130 and the boil-off gas compressor 110, and may perform a function of performing the 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 booster 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. 2.
The utility model discloses in, still include: 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.
Furthermore, in an embodiment, the present invention may include an boil-off gas additional compressor 170 for further compressing the boil-off gas compressed by the boil-off 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.
In addition, 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.
Further, in an embodiment, the present invention may include a flow control valve 200 for supplying the Liquefied Natural Gas (LNG) fuel converted into a liquefied state by expanding the boil-off gas cooled by the 1 st heat exchanger 140 between the 1 st heat exchanger 140 and the Liquefied Natural Gas (LNG) fuel tank 10, and then supplying the Liquefied Natural Gas (LNG) fuel into the Liquefied Natural Gas (LNG) fuel tank.
The flow control valve 200 corresponds to a joule-thomson (joule thomson) valve, and by rapidly expanding the boil-off gas cooled by the 1 st heat exchanger 140, the boil-off gas can be converted into Liquefied Natural Gas (LNG) fuel in a liquefied state by a pressure drop of the compressed gas and supplied to the Liquefied Natural Gas (LNG) fuel tank 10. By means of the flow control valve 200 as described above, it can be re-liquefied at a temperature of about-160 degrees below zero.
Further, in an embodiment, the present invention may include a gas-liquid separator 210 for re-supplying the separated boil-off gas into the boil-off gas compressor 110 after separating the boil-off gas remaining in the Liquefied Natural Gas (LNG) fuel in a liquefied state supplied through the flow control valve 200 between the flow control valve 200 and the Liquefied Natural Gas (LNG) fuel tank 10.
The gas-liquid separator 210 is divided into a pipeline for supplying Liquefied Natural Gas (LNG) fuel, which is reliquefied in the flow control valve 200, to the inside of the Liquefied Natural Gas (LNG) fuel tank 10, and a pipeline for re-supplying the separated boil-off gas to the boil-off gas supply pipeline connecting the Liquefied Natural Gas (LNG) fuel tank 10 and the boil-off gas compressor 110 after separating the boil-off gas remaining in the reliquefied Liquefied Natural Gas (LNG) fuel.
Thereby, the boil-off gas separated by the gas-liquid separator 210 is supplied to the boil-off gas compressor 110 after being recombined with the Liquefied Natural Gas (LNG) fuel supplied from the LNG fuel tank 10.
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. 2.
First, in step S201, 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 S202, 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 S203, 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 S204, 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 10.
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 invention can be practiced with modification and alteration within the spirit and scope of the appended claims.

Claims (7)

1. A Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for a small and medium sized Liquefied Natural Gas (LNG) fueled propulsion vessel, 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 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 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 and then cooled 2 nd time by the 1 st heat exchanger.
2. The Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in 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 Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in 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 Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in claim 1, 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.
5. The Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in claim 1, wherein:
between the 2 nd heat exchanger and the engine,
a vaporizer for vaporizing the Liquefied Natural Gas (LNG) fuel heat-exchanged by the 2 nd heat exchanger.
6. The Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in claim 1, further comprising:
and a flow control valve disposed between the 1 st heat exchanger and the Liquefied Natural Gas (LNG) fuel tank, for expanding the boil-off gas cooled by the 1 st heat exchanger to convert the boil-off gas into Liquefied Natural Gas (LNG) fuel, and then supplying the Liquefied Natural Gas (LNG) fuel to the LNG fuel tank.
7. The Liquefied Natural Gas (LNG) boil-off gas reliquefaction system for small and medium sized Liquefied Natural Gas (LNG) fueled marine vessels as claimed in claim 6, further comprising:
and a gas-liquid separator provided between the flow rate control valve and the Liquefied Natural Gas (LNG) fuel tank, for separating the boil-off gas remaining in the Liquefied Natural Gas (LNG) fuel supplied through the flow rate control valve and then re-supplying the separated boil-off gas to the boil-off gas compressor.
CN202120221241.4U 2020-02-20 2021-01-27 LNG boil-off gas reliquefaction system Active CN214701458U (en)

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KR1020200020804A KR102418019B1 (en) 2020-02-20 2020-02-20 Lng boil-off re-liquefaction system for small and medium lng fuel propulsion ships and method to re-liquefaction lng boil-off using therefore
KR10-2020-0020804 2020-02-20

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CN114017989A (en) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 LNG-BOG reliquefaction system and mixed refrigerant suitable for same
CN114017988A (en) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 BOG (boil-off gas) reliquefaction circulation system for LNG (liquefied Natural gas) ship based on mixed working medium refrigeration technology

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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
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017989A (en) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 LNG-BOG reliquefaction system and mixed refrigerant suitable for same
CN114017988A (en) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 BOG (boil-off gas) reliquefaction circulation system for LNG (liquefied Natural gas) ship based on mixed working medium refrigeration technology

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