US20080127673A1 - Lng Transportation Vessel and Method For Transporting Hydrocarbons - Google Patents

Lng Transportation Vessel and Method For Transporting Hydrocarbons Download PDF

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Publication number
US20080127673A1
US20080127673A1 US11/665,889 US66588905A US2008127673A1 US 20080127673 A1 US20080127673 A1 US 20080127673A1 US 66588905 A US66588905 A US 66588905A US 2008127673 A1 US2008127673 A1 US 2008127673A1
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United States
Prior art keywords
heat exchanger
natural gas
vessel
fluid
gas
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Abandoned
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US11/665,889
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English (en)
Inventor
Ronald R. Bowen
Brandon T. Stone
Eric D. Nelson
Kevin N. Stanley
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Individual
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Individual
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Priority to US11/665,889 priority Critical patent/US20080127673A1/en
Publication of US20080127673A1 publication Critical patent/US20080127673A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • 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
    • F17C5/04—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases requiring the use of refrigeration, e.g. filling with helium or hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
    • F25J1/0251—Intermittent or alternating process, so-called batch process, e.g. "peak-shaving"
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F25J1/0278—Unit being stationary, e.g. on floating barge or fixed platform
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J1/0284—Electrical motor as the prime mechanical driver
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
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    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0294—Multiple compressor casings/strings in parallel, e.g. split arrangement
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    • 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
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    • 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
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    • 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
    • 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
    • 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
    • F17C2270/011—Barges
    • 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
    • F17C2270/011—Barges
    • F17C2270/0113—Barges floating
    • 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
    • F17C2270/0118—Offshore
    • F17C2270/0121—Platforms
    • 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
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • F17C2270/0136—Terminals
    • 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
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0171—Trucks

Definitions

  • Embodiments of the present invention generally relate to the transportation of hydrocarbons. More particularly, embodiments of the present invention relate to an integrated design for a liquefied natural gas transportation vessel. In addition, embodiments of the present invention relate to a method for combining liquefaction, transportation and regasification processes.
  • the gas may be taken through a liquefaction process.
  • the liquefied natural gas (“LNG”) is formed by chilling very light hydrocarbons, e.g., gases containing methane, to approximately ⁇ 160° C.
  • the liquefied gas may be stored at ambient pressure in special, cryogenic tanks disposed on large ships.
  • LNG may be liquefied at an increased pressure and at a warmer temperature, i.e., above ⁇ 160° C., in which case it is known as Pressurized LNG (“PLNG”).
  • PLNG Pressurized LNG
  • PLNG Pressurized LNG
  • LNG Pressurized LNG
  • LNG tankers The transportation of LNG to the importing nation or locale is expensive.
  • gas is taken through a liquefaction process at a location proximate the point of production. This means that a large gathering and liquefaction center is erected in the producing country.
  • the liquefaction process may take place offshore on a platform or vessel, such as a floating production, storage and offloading (FPSO) vessel. From there, the hydrocarbon product is loaded in its liquefied state onto marine transport vessels.
  • FPSO floating production, storage and offloading
  • the LNG product Upon arrival at a destination country, the LNG product is offloaded at a receiving terminal.
  • the receiving terminal may be onshore or “near shore” relative to the importing nation.
  • the gas is temporarily maintained in storage in its chilled and liquefied state. Liquefaction enables larger volumes of gas to be stored in insulated tanks until introduced into the gas grid, or delivered to a customer.
  • the chilled gas is transported in specially insulated vessels on the back of a trailer and hauled over-the-road to markets.
  • the imported LNG is “vaporized” into the grid for the market.
  • LNG technology generally requires large investments of capital and resources at the export and import terminals. It also requires cryogenic transfer of liquids at each end. In many locations, natural gas resources are present in insufficient quantities to justify the expense of building a gas liquefaction processing facility in the producing country or at the producing site. In addition, the transfer of cryogenic material, particularly from an FPSO, is difficult. Alternatively, consumer demand at the importing location may not economically justify the fabrication of a regasification facility. Therefore, there is a need for an integrated vessel that is capable of receiving a light hydrocarbon product at an export terminal of a producing country, chilling the gas to a liquefied state, and then transporting the gas to a location in greater proximity to the desired market.
  • a method for transporting liquefied natural gas includes the steps of on-loading natural gas in a substantially gaseous phase onto a vessel at a first location; cooling the natural gas on the vessel so as to convert it substantially into liquefied natural gas; storing the liquefied gas in an insulated container; transporting the liquefied natural gas on the vessel from the first location to a second location; heating the liquefied natural gas on the vessel so as to reconvert it back into a substantially gaseous phase; and off-loading the natural gas from the vessel at the second location.
  • the steps of cooling the natural gas and heating the liquefied natural gas are each accomplished by using a gas processing facility. More preferably, the same gas processing facility is used for both cooling (liquefying) the natural gas and heating the liquefied natural gas.
  • the method for transporting LNG may be accomplished on a variety of vessels. Examples include a marine vessel, a barge vessel, and an over-the-road trailer vessel.
  • a method for transporting liquefied natural gas on a vessel.
  • the method generally comprises the steps of providing a gas transfer system for the vessel; on-loading the natural gas onto the vessel through the gas transfer system, the natural gas being in essentially a gaseous phase; providing a gas processing facility on the vessel, the gas processing facility selectively cooling and heating the natural gas; flowing the natural gas through the gas processing facility so as to cool the natural gas to a lower temperature where the natural gas is in a substantially liquefied phase, and providing a containment structure on the vessel for containing the liquefied natural gas during transport.
  • a vessel for transporting liquefied natural gas includes a gas transfer system for on-loading and off-loading natural gas to and from the vessel in its essentially gaseous phase; a gas processing facility for selectively (i) cooling the natural gas from a temperature where the natural gas is in a gaseous phase, to a lower temperature where the natural gas is in a substantially liquefied phase; and (ii) heating the natural gas from a temperature where the natural gas is in a substantially liquefied phase, to a temperature where the natural gas is converted back to its gaseous phase; a power generator for providing power to the gas processing facility; and a containment structure for containing the liquefied natural gas during transport.
  • the vessel again may be any type of transport vessel, including for example a marine vessel, a barge vessel, or an over-the-road trailer vessel.
  • the gas transfer system may further comprise a buoyed line for placing the gas processing facility in fluid communication with a marine jumper line.
  • the gas transfer system may further comprise a line for placing the gas processing facility in fluid communication with a land hose.
  • the containment structure may be one or more Moss sphere tanks, it may be a membrane tank, or it may be a plurality of pressurized bottles in fluid communication. The plurality of bottles maintain the LNG under pressures greater than ambient.
  • the gas processing facility comprises at least one heat exchanger through which the natural gas thermally contacts a heat exchanger fluid; and at least one fluid movement device.
  • the fluid movement device may be either a compressor or a pump.
  • the gas processing facility cools the natural gas by providing a first heat exchanger for cooling the natural gas by thermal contact between the natural gas and a heat exchanger fluid; a compressor wherein the heat exchanger fluid is compressed and temporarily warmed after flowing through the first heat exchanger; a second heat exchanger wherein the compressed heat exchanger fluid is cooled; and an expander wherein the compressed heat exchanger fluid is further cooled, and decompressed before returning through the first heat exchanger.
  • the gas processing facility heats the natural gas by providing a first heat exchanger for warming the natural gas by thermal contact between the natural gas and a heat exchanger fluid; and a second heat exchanger wherein the heat exchanger fluid is warmed after flowing through the first heat exchanger.
  • the heat exchanger fluid movement device may be a compressor wherein the heat exchanger fluid is compressed and further warmed after flowing through the second heat exchanger and before returning through the first heat exchanger.
  • the fluid movement device is a pump disposed in line between the first and second heat exchangers for pressurizing the liquefied heat exchanger fluid.
  • the power generator is configured to selectively provide power to propel the vessel when the natural gas is stored in the containment structure, and to provide power to the gas processing facility when the natural gas is being cooled or heated.
  • the vessel may further have an ancillary compressor for circulating and cooling the heat exchanger fluid while the vessel is transporting the LNG in order to recondense any natural gas that becomes vaporized during transport, or to generally keep the heat exchanger fluid and system equipment cool.
  • FIG. 1A presents a plan view of the main deck of a fluid transportation vessel.
  • the exemplary vessel is a marine vessel. Visible in this view are a bridge, a cargo storage area, and a gas processing facility.
  • the cargo storage area represents one or more individual tanks within a liquefied gas containment structure.
  • FIG. 1B presents an alternate marine vessel for transporting fluids in a temperature-controlled environment.
  • the containment structure of the LNG transportation vessel of FIG. 1B is a Moss sphere tank.
  • FIG. 1C presents yet an additional alternate marine vessel for transporting fluids in a temperature-controlled environment.
  • the containment structure of the LNG transportation vessel of FIG. 1C is a membrane tank.
  • the illustrative vessel is again a marine vessel.
  • FIG. 2 is a side view of the vessel of FIG. 1A .
  • the profile of the vessel can be seen. Visible in this view is a side of the containment structure of FIG. 1A .
  • FIG. 3 presents a schematic view of the gas processing facility of FIG. 1A , in one embodiment. Arrows depict the process of liquefaction for the light hydrocarbons.
  • FIG. 4A presents another schematic view of the gas processing facility of FIG. 1A .
  • arrows depict the process of regasification for the light hydrocarbons.
  • FIG. 4B presents an alternate arrangement for the regasification facility of FIG. 4A .
  • arrows again depict the process of regasification for the light hydrocarbons.
  • FIG. 5A demonstrates an LNG transportation vessel as a barge vessel.
  • the barge vessel is being towed by a tug boat.
  • FIG. 5B demonstrates the LNG transportation vessel as a trailer vessel.
  • the trailer vessel is being pulled by an over-the-road rig.
  • Natural gas means a light hydrocarbon gas or a mixture including two or more light hydrocarbon gases that includes greater than 25 molar percent methane on a hydrocarbon species basis.
  • natural gas may contain methane along with other hydrocarbon components such as, but not limited to, ethane, propane, butane, or isomers thereof.
  • Natural gas may also include non-hydrocarbon contaminant species such as, for example, carbon dioxide, hydrogen sulfide, water, carbonyl sulfide, mercaptans and nitrogen.
  • LNG or “liquefied natural gas” means natural gas or a portion thereof that has been liquefied.
  • LNG includes, for example, natural gas induced into a liquid form through cooling at about atmospheric pressure and by both cooling and application of increased pressure over ambient pressure such as “PLNG.”
  • “Vessel” means any fluid transportation structure. Non-limiting examples of a vessel include a marine vessel, a barge vessel, or a trailer vessel.
  • Marine vessel means a vessel configured to transport volumes of fluids such as LNG over an ocean or other large water body.
  • Barge vessel means a vessel configured to transport volumes of fluids such as LNG over a river or within a marine inlet or bay.
  • Trailer vessel means a vessel configured to transport volumes of fluids such as LNG on a trailer. The trailer is pulled by a truck, a rig, or other mechanized vehicle over-the-road.
  • on-loading and “off-loading” refer to the movement of fluids onto and off of a vessel, respectively. The terms are not limited as to the manner in which fluid movement is accomplished.
  • Gas transfer system means a system for on-loading or off-loading of fluids in at least a partially gaseous phase.
  • Non-limiting examples of features for a gas transfer system include compressors, valves, conduits and pumps.
  • Ambient temperature refers to the temperature prevailing at any particular location.
  • Expander means any device capable of reducing pressure in a fluid line, including but not limited to an expansion valve or turboexpander.
  • natural gas includes a light hydrocarbon gas or a mixture including two or more light hydrocarbon gases that includes greater than 25 molar percent methane.
  • natural gas may include greater than 40 molar percent methane or greater than 70 molar percent methane on a hydrocarbon species basis.
  • Some embodiments of the invention include apparatus and methods for liquefying natural gas to form LNG or regasifying LNG to reform natural gas.
  • LNG includes natural gas or a portion thereof that has been liquefied.
  • LNG may include any light hydrocarbon or mixture of two or more light hydrocarbons in substantially liquid form that includes greater than 25 molar percent methane on a hydrocarbon species basis.
  • LNG may include greater than 40 molar percent methane or greater than 70 molar percent methane on a hydrocarbon species basis.
  • FIG. 1A presents a plan view of a fluid transportation vessel 100 .
  • the illustrative fluid transportation vessel 100 is a marine vessel.
  • the vessel 100 is specifically configured to carry liquefied natural gas, or “LNG,” over an ocean or other large water body.
  • LNG liquefied natural gas
  • the vessel 100 is nominally 300 meters in length.
  • the vessel 100 includes a main deck 12 , visible in the plan view of FIG. 1A .
  • FIG. 2 provides a side view of the vessel 100 of FIG. 1A .
  • a profile of the vessel 100 can be seen, defined by a hull 16 .
  • the hull 16 is generally under the main deck 12 .
  • the hull 16 provides for a “ship-shaped” vessel that is preferably self-propelled. However, it is understood that the scope of the present inventions is not limited to vessels that are ship-shaped or self-propelled.
  • the marine vessel 100 includes a bridge 20 .
  • the bridge 20 is typically at either the fore or aft sections of the vessel.
  • the bridge 20 is seen in both FIGS. 1A and 2 at the bow of the ship 100 .
  • the bridge 20 is positioned on the deck 12 , and provides living quarters for the ship's officers and crew members.
  • the bridge 20 also provides navigational and operational controls for the ship 100 . It is understood that the vessel will also have a navigation system that will include a steering or guidance mechanism, a rudder and instrumentation (all not shown).
  • the marine vessel 100 further includes a cargo storage area 30 , or “containment structure.”
  • the containment structure 30 is shown schematically in FIGS. 1A and 2 , and is intended to represent a single “insulated compartment.”
  • the illustrative containment structure 30 includes a plurality of containers 30 A configured to hold a cryogenic fluid such as LNG under pressure.
  • the containment structure 30 is cut away in each of FIGS. 1A and 2 to expose a sampling of containers 30 A. It is understood that the containment structure 30 is not limited to a single “insulated compartment;” the containers 30 A may be individually insulated.
  • Selected sets of bottles 30 A are in fluid communication with one another to form a “tank.”
  • the bottles 30 A have appropriate valving 32 for moving LNG into and out of the bottles 30 A.
  • four-inch piping connections are provided for moving cryogenic fluids into and out of the containers 30 A, though it is understood that other dimensions may be employed.
  • the containers 30 A may be at ambient pressure or slightly higher, and contain natural gas chilled to a temperature of approximately ⁇ 160° F. ( ⁇ 106.7° C.) or less to provide liquefaction. Alternately the natural gas may be chilled to a temperature of approximately ⁇ 190° F. ( ⁇ 123.3° C.) or less.
  • the containers may be at ambient pressure or slightly higher, and contain natural gas chilled to a temperature of between approximately ⁇ 200° F. to ⁇ 270° F. ( ⁇ 128.9° C. to ⁇ 167.8° C.).
  • the containers 30 A may alternatively be stored at a higher pressure above approximately 150 psi, and at temperature of approximately ⁇ 193° F. ( ⁇ 125° C.) or more.
  • the containers may be stored at a pressure in the range of approximately 250-450 psi, and at temperature between about ⁇ 175° F. and ⁇ 130° F. ( ⁇ 115° C. to ⁇ 90° C.).
  • the liquefaction temperature of a hydrocarbon will depend upon its pressure and composition.
  • the bottles 30 A are preferably cylindrical in shape, and are typically fabricated from a steel material. Where the containers 30 A serve as a pressure vessel, they are preferably fabricated from a steel material having walls of appropriate thickness. One or more bottles 30 A in fluid communication together form a single “tank.”
  • FIG. 1B presents a containment structure for an LNG transportation vessel 100 B as a plurality of Moss sphere tanks 30 B.
  • the exemplary vessel 10 is again a marine vessel.
  • the Moss sphere tanks 30 B are semispherical or elongated in shape, and may have a diameter of up to 40 or more meters. Typically, three to five Moss sphere tanks will be placed on a single marine vessel. LNG is stored in the Moss sphere tanks at ambient pressure.
  • FIG. 1C presents a containment structure 30 C for an LNG transportation vessel 100 C as a membrane tank.
  • the exemplary vessel 100 C is again a marine vessel.
  • a membrane tank is typically a square or rectangular structure having steel lining (not shown) for providing a fluid-tight compartment.
  • the lining is structurally supported by a frame that is insulated.
  • the framing forms an insulated cargo hold.
  • Each membrane tank 30 C may be 40 meters ⁇ 40 meters in footprint, for example.
  • Each illustrative marine vessel 100 , 100 B, 100 C also includes a gas processing facility.
  • the gas processing facility is shown schematically at 40 , and is intended to represent any facility that can selectively cool or heat fluids such as natural gas.
  • the gas processing facility 40 will first cool the natural gas from an essentially ambient temperature where the natural gas is in a gaseous phase, to a lower temperature where the natural gas is in a substantially liquefied phase. This occurs in connection with a procedure for on-loading of natural gas onto the vessel, e.g., vessel 100 .
  • the gas processing facility 40 will preferably also heat the natural gas from a temperature where the natural gas is in a substantially liquefied phase, to an essentially ambient temperature where the natural gas is converted back to its gaseous phase. This occurs in connection with a procedure for off-loading of natural gas from the vessel 100 , 100 B or 100 C.
  • FIG. 3 presents a more detailed view of the gas processing facility 40 , in one embodiment.
  • the gas processing facility 40 is set up for the cooling of fluids, or “liquefaction.”
  • Arrows depict the flow of fluids for the process of cooling the natural gas. More specifically, arrow G shows the movement of gas through the gas processing facility 40 located on the vessel 100 , while arrow C demonstrates the pumping of a coolant to cryogenically refrigerate the gas.
  • FIGS. 4A and 4B present other schematic views of the gas processing facility 40 of FIGS. 1 , 1 B and 1 C.
  • the gas processing facility 40 is set up for the heating of fluids, or “regasification.”
  • Arrows depict the flow of fluids for a process of regasification of light hydrocarbons.
  • Arrow G shows the movement of gas through the gas processing facility 40 located on the vessel 100
  • arrow H demonstrates the pumping of a heat exchanger fluid to warm the gas.
  • FIGS. 4A and 4B provide alternate gas processing systems for regasification.
  • the gas processing facility of FIG. 3 is an intermediate facility between the reception of natural gas from the field, and the storage of LNG in the containment structure 30 for transport.
  • the gas processing facilities of FIGS. 4A and 4B each provide an intermediate facility between the offloading of natural gas from the containment structure 30 to an import terminal.
  • a gas transfer system is provided.
  • the gas transfer system is represented schematically by line 50 in FIGS. 3 , 4 A and 4 B.
  • the gas transfer system 50 will comprise a line that provides fluid communication between the gas processing facility 40 and a line (not shown) external to the vessel 100 .
  • the fluid transportation vessel is a marine vessel (such as the vessel 100 of FIG.
  • the line will connect to a marine jumper.
  • the marine jumper will preferably be buoyed with either integral or attached buoys.
  • the fluid transportation vessel is a trailer vessel (seen in FIG. 5B )
  • the line will connect to a land hose.
  • FIG. 5A demonstrates an LNG transportation vessel as a barge vessel 500 A.
  • the barge vessel 500 A is being towed by a tug boat 510 A.
  • the vessel 500 A includes a gas transfer system 502 A, a gas processing facility 504 A, and a fluid containment structure 506 A.
  • the gas transfer system 502 A will typically define a hose configured to connect to a marine jumper line (not shown).
  • the barge vessel 500 A is preferably pulled by a tug 510 A.
  • the vessel 500 A may be integral to the tug 510 A, but is preferably a separate floating apparatus that can be hitched and unhitched.
  • FIG. 5A shows a hitching line 501 A.
  • the tug 510 A includes an engine and propeller (not shown).
  • the engine is typically diesel or gasoline powered, and operates to drive the propeller in the water W.
  • the barge 510 A may also include a battery (not shown) for powering electrical equipment such as lights.
  • the gas processing facility 504 A is powered by either the engine or the battery of the tug 510 A.
  • FIG. 5B demonstrates the LNG transportation vessel as a trailer vessel 500 B.
  • the vessel 500 B includes a gas transfer system 502 B, a gas processing facility 504 B, and a fluid containment structure 506 B.
  • the gas transfer system 502 B will typically define a valve and, perhaps, a hose configured to connect to a supply line (not shown).
  • the trailer vessel 500 B is being pulled by an over-the-road rig 510 B.
  • the trailer vessel 500 B is disposed on a multi-axle trailer 520 B for land-based transport.
  • the trailer vessel 500 B is propelled by being pulled behind the rig 510 B, or “truck.”
  • the vessel 500 B may be integral to the truck 510 B, but is preferably on a separate trailer 520 B that can be hitched and unhitched.
  • the truck 510 B includes an engine and shaft (not shown).
  • the engine is typically diesel or gasoline powered, and operates to drive a shaft that transmits rotational motion to a transmission.
  • the truck 510 B also includes a battery (not shown) for powering electrical equipment.
  • the gas processing facility 504 B is powered by the engine of the truck 510 B, reducing equipment requirements.
  • the engine may drive an electrical generator for creating electrical power for the gas processing facility 504 B.
  • a volume of fluid such as natural gas is brought from the field to a gathering center.
  • the gathering center may be on land, near shore, or offshore.
  • the natural gas is stored at an essentially ambient temperature.
  • the vessel is offshore and receives natural gas pumped from the gathering facility (not shown) onto the vessel through the gas transfer system 50 .
  • the natural gas is not stored directly in the containment structure 30 of the vessel 100 ; rather, it is pumped through the gas processing facility 40 for liquefaction in accordance with FIG. 3 .
  • a gas process facility 40 is again shown.
  • the gas process facility 40 is used for the purpose of condensing a fluid, such as natural gas.
  • Arrow G depicts the flow of gas during liquefaction, as described above.
  • the gas process facility 40 includes a first heat exchanger 42 .
  • the first heat exchanger 42 acts to cool the natural gas by thermal contact between the natural gas and a heat exchanger fluid.
  • the first heat exchanger 42 provides suitable adjacent fluid channels (not shown) for directing hydrocarbons and a heat exchanger fluid, respectively, so that the two channels are in thermal contact with one another.
  • the heat exchanger fluid acts as a refrigerant flowing through lines “C.”
  • the gas process facility 40 also includes a compressor 44 .
  • the compressor 44 receives the heat exchanger fluid, or refrigerant, as it cycles from the first heat exchanger 42 , and compresses the refrigerant.
  • the process of compressing the refrigerant also acts to temporarily warm the refrigerant as it moves through the compressor 44 .
  • the refrigerant is approximately 35° F. (1.7° C.) upon exiting the first heat exchanger 42 , and is 300° F. (148.9° C.) upon exiting the compressor 44 .
  • the gas process facility 40 also includes a second heat exchanger 46 .
  • the compressed refrigerant is cooled in the second heat exchanger 46 .
  • the second heat exchanger 46 provides adjacent fluid channels (not shown) through which the refrigerant and a coolant fluid flow.
  • the coolant fluid acts to chill the refrigerant through thermal contact.
  • the coolant may be the abundantly available sea water or air.
  • the coolant may be fresh water or air.
  • a trailer vessel such as vessel 500 B seen in FIG. 5B
  • the coolant is most typically air.
  • the gas process facility 40 also includes an expander 48 .
  • the expander 48 acts to expand the compressed refrigerant.
  • the expander 48 may be an expansion valve, a turboexpander, or any other device for expanding fluid.
  • the process of expanding the compressed refrigerant acts not only to decompress the refrigerant, but also to further chill it.
  • the refrigerant is at a temperature of approximately 65° F. upon exiting the second heat exchanger 46 , but is ⁇ 170° F. upon exiting the expander 48 .
  • the significantly chilled refrigerant is then cycled back through the first heat exchanger 42 where it again acts to refrigerate the natural gas.
  • the natural gas is condensed into a substantially liquid phase.
  • the gas process facility 40 of FIG. 3 acts as a liquefaction facility.
  • FIG. 4A the gas process facility 40 is again shown.
  • the gas process facility 40 is used for the purpose of heating a fluid, such as natural gas.
  • Arrow G depicts the process of regasification for the light hydrocarbons as described above. The arrows are generally directed in opposite directions from the arrows of FIG. 3 .
  • the gas process facility 40 again includes a first heat exchanger 42 .
  • the first heat exchanger 42 acts to warm the natural gas by thermal contact between the natural gas and the heat exchanger fluid.
  • the heat exchanger fluid acts as a heating fluid flowing through lines “H.”
  • the first heat exchanger 42 provides suitable fluid channels (not shown) for directing natural gas in its liquid phase, and a heat exchanger fluid, so that the two channels are in thermal contact with one another.
  • the heat exchanger fluid acts as a heating fluid.
  • the heat exchanger fluid moves to the second heat exchanger 46 .
  • the heat exchanger fluid bypasses the expander 48 . It can be seen in FIG. 4A that the arrows do not indicate the flow of fluids through the expander 48 .
  • the second heat exchanger 46 now acts to warm the heat exchanger fluid.
  • the process of cycling the heat exchanger fluid through the first heat exchanger 42 has produced a cooling of the heat exchanger fluid.
  • the heat exchanger fluid is now very cold upon exiting the exchanger 42 .
  • the heat exchanger fluid is warmed in the second heat exchanger 46 .
  • the second heat exchanger 46 provides adjacent fluid channels (not shown) through which the heat exchanger fluid and a warming fluid flow.
  • the warming fluid acts to warm the heat exchanger fluid through thermal contact.
  • the warming fluid may be sea water.
  • the warming fluid is fresh water maintained on the vessel at ambient temperature by a combustion or other warming process not shown.
  • the second heat exchanger 46 may be a tank which receives and heats fresh water directly, such as through combustion.
  • the warming fluid may be either air or water.
  • the heat exchanger fluid moves through the compressor 44 .
  • the compressor 44 compresses the heating fluid, and delivers it to the first heat exchanger 42 in a further warmed state.
  • the process of compressing the fluid also acts to warm the fluid as it moves through the compressor 44 .
  • the heat exchanger fluid is approximately 55° F. upon exiting the second heat exchanger 46 , but is approximately 300° F. upon exiting the compressor 44 .
  • the significantly warmed heat exchanger fluid is then cycled back through the first heat exchanger 42 where it again acts to warm the natural gas.
  • the natural gas is vaporized into a substantially gaseous phase for offloading.
  • the gas process facility 40 of FIG. 4 acts as a regasification facility.
  • the scope of the present inventions is not limited to any particular temperatures, so long as the temperature of the heat exchanger fluid as it enters the first heat exchanger is sufficiently low to liquefy the natural gas (or other fluid) in the liquefaction process, and sufficiently high to vaporize the natural gas (or other fluid) in the gasification process. It is noted, however, that the gas processing facility 40 operates more efficiently where water is available in the second heat exchanger 46 that is warm, i.e., five degrees Fahrenheit or more above freezing. In an environment that lacks a suitable ambient temperature warming medium, integration of the liquefaction and vaporization heat exchangers is difficult. In this scenario, the gas processing facility 40 would preferably employ a vaporization means heated through combustion of a portion of the natural gas product. The fired vaporization facilities would benefit from the integration of utilities like water supply and fuel gas systems with the liquefaction process.
  • FIG. 4B presents an alternate arrangement for the gas processing facility of FIG. 4A .
  • arrows again depict the process of regasification for the light hydrocarbons.
  • the system is now shown at 40 ′.
  • the heat exchanger fluid is again cycled through the first heat exchanger 42 in order to warm (“regasify”) the LNG.
  • the regasified hydrocarbons exit the gas processing facility 40 ′ through line 50 .
  • the natural gas is vaporized into a substantially gaseous phase for offloading.
  • the gas process facility 40 ′ of FIG. 4B also acts as a regasification facility.
  • the process of cycling the heat exchanger fluid through the first heat exchanger 42 has produced a cooling of the heat exchanger fluid, substantially liquefying it.
  • the heat exchanger fluid is first moved through a pump 49 .
  • the pump 49 serves as an alternate fluid movement device vis-à-vis the compressor 44 . It can again be seen that the heat exchanger fluid again bypasses the expander 48 .
  • the pump 49 is provided after the first 42 heat exchanger in order to energize and warm the heat exchanger fluid.
  • the pump 49 also transfers the liquid heat exchanger fluid, e.g., sea water, towards the second heat exchanger 46 .
  • the second heat exchanger 46 acts to further warm the heat exchanger fluid.
  • the second heat exchanger 46 provides adjacent fluid channels (not shown) through which the heat exchanger fluid and a warming fluid flow.
  • the warming fluid acts to warm the heat exchanger fluid through thermal contact.
  • the warming fluid may again be seawater or fresh water that has been warmed through a direct combustion process.
  • the warming fluid may be either air or water.
  • the heat exchanger fluid returns directly to the first heat exchanger 42 where it again acts to warm the natural gas. It can be seen that the compressor 44 has been bypassed in FIG. 4B .
  • the compressor 44 is optionally not used when a pump 49 is employed. The process of pumping the fluid through pump 44 provides the pressure needed to cycle the heat exchanger fluid through the system 40 ′.
  • FIGS. 3 , 4 A and 4 B it can be seen from the arrangements of FIGS. 3 , 4 A and 4 B that substantially the same physical equipment and heat exchange fluids for both the liquefaction operation and the regasification operation may be employed.
  • By modifying the refrigeration system operation as shown in FIG. 3 it is possible to use the same heat exchangers and heat transfer fluids for vaporization of the gas via systems 40 , 40 ′ of FIGS. 4A and 4B . This results in equipment savings on the vessel.
  • the vessel is a marine vessel
  • the water temperature at the import location is warm, i.e., approximately five degrees Fahrenheit or more above freezing, or if ambient heating medium of any type is available from a source near the import location, it is possible to install the liquefaction and regasification equipment 40 on the vessel, e.g., vessel 100 , in a more cost-effective manner.
  • the heat exchanger fluid is moved through the system 40 by compression. Compression may be accomplished by using the compressor 44 as the fluid movement device.
  • the heat exchanger fluid is moved through the system by pumping. Pumping may be accomplished in connection with pump 49 as the fluid movement device. Power is provided to either the compressor 44 or the pump 49 (and other mechanical parts of the gas process facilities 40 and 40 ′) by a power generator.
  • a power generator is shown schematically at 41 in FIGS. 3 , 4 A and 4 B.
  • the power generator 41 is preferably an engine.
  • the engine may be gas-powered, with the gas being provided from either naturally-occurring boil-off of natural gas from the LNG stored in the containment structure 30 , or from an independent fuel supply (not shown).
  • the engine may be diesel powered. In this instance, a diesel supply (not shown) would be provided on the ship.
  • the power generator 41 drives a motor 43 m .
  • Arrow “e” indicates an electric line providing power to the motor 43 m .
  • the motor 43 m in turn, provides mechanical power to run the vessel's propulsion system, shown schematically at 43 .
  • Arrow “s” is indicative of a mechanical shaft going to the propulsion system 43 .
  • the ship's propulsion system 43 be integrated with the power system for powering the gas processing facility 40 or 40 ′.
  • the power generator may be used to drive separate motors 44 m and 49 m ( 49 m not shown).
  • the motors 44 m and 49 m provide mechanical power to either the compressor 44 (in the arrangement of FIGS. 3 and 4A and B) or the pump 49 (in the arrangement of FIG. 4B ), respectively.
  • the power requirements should be generally comparable.
  • a single, integrated power generation plant and electric or hydrocarbon motor drive may be installed to provide the power needed for both operations.
  • the gas compression 44 and ship propulsion 43 are preferably not used at the same time so as to minimize the overall power generation needs for the ship.
  • the power generator 41 is a power generation plant that feeds a single variable frequency drive (VFD). The VFD is used to alternately control the ship's propulsion 43 and to power refrigeration motors 44 m and 49 m .
  • VFD variable frequency drive
  • the present inventions are not limited to the way in which power is shared or transferred between the propulsion system 43 and the gas processing facility 40 .
  • Other power arrangements may be used, such as the modification of motor windings, or the use of a gear box system that employs mechanical shafts.
  • the ship's power generator 41 may be used for initial liquefaction of the natural gas, as described above in connection with FIG. 3 .
  • a smaller separate compressor 45 may optionally be provided to provide power to the gas processing facility 40 during the transport stage.
  • natural gas that vaporizes during transport due to an increase in temperature within the containment structure 30 would be captured in the first heat exchanger 42 .
  • the compressor 45 would be activated by an ancillary smaller motor 45 m to temporarily operate the condensing process in order to re-cool the natural gas without interrupting the ship's propulsion power 43 .
  • the ancillary motor 45 m draws a smaller amount of power from the power generator 41 .
  • An electric line “e” is shown between the power generator 41 and the smaller generator 45 m . Further, a mechanical shaft “s” is shown going into the compressor 45 . Finally, a bypass loop “b” is provided to circulate heat exchanger fluid through the smaller compressor 45 rather than the primary compressor 44 .
  • a smaller, ancillary compressor 45 has many advantages. First, this arrangement allows reliquefaction of hydrocarbons during transit. This, in turn, accommodates a much higher boil-off gas rate from the containment structure 30 . This also reduces the insulation requirements for the cryogenic storage. Further, the use of a smaller, ancillary compressor 45 keeps the heat exchanger fluid and system equipment cold during transit, allowing the vessel to be prepared more quickly to receive natural gas more quickly upon docking at an export terminal for liquefaction.
  • two independent power generation systems are provided.
  • One system operates to power the ship's propulsion system 43
  • the other system operates the gas processing facility 40 along with the miscellaneous process equipment associated with liquefaction and vaporization.
  • process equipment may include firefighting equipment, gas processing controls, fluid pumps, and drain valves.
  • a method for transporting liquefied natural gas on a vessel is also provided.
  • the vessel may be a marine vessel such as vessel 100 of FIG. 1A , a barge vessel such as vessel 500 A of FIG. 5A , or a trailer vessel such as vessel 500 B of FIG. 5B .
  • a gas transfer system such as system 50 of FIG. 3 , is provided on the vessel.
  • a containment structure is provided on the vessel for containing the liquefied natural gas.
  • the containment structure may be, by example, one of the structures shown in FIG. 1A , 1 B, 1 C, 5 A or 5 B.
  • a gas processing facility is provided on the vessel.
  • the gas processing facility may be such as facility 40 of FIGS. 3 and 4A or facility 40 ′ of FIG. 4B , and may selectively cool and heat the natural gas.
  • the natural gas is on-loaded onto the outfitted vessel at an export terminal.
  • the natural gas is on-loaded through a gas transfer system at essentially ambient temperature and in a gaseous phase.
  • the transport vessel may optionally be integrated with the natural gas production system.
  • the transport vehicle would receive raw fluids from the well, and provide the facilities to process the fluids into gas, ambient hydrocarbon liquid, and produced water.
  • the production facilities would receive utility and operating benefits through integration with the liquefaction and vaporization facilities.
  • the transport vehicle would also have the storage capacity to transport and deliver any ambient liquid hydrocarbon products created in the production system.
  • the natural gas flows through the first heat exchanger 42 of the gas processing facility 40 so as to cool the natural gas from its ambient temperature.
  • the natural gas is brought to a lower temperature where it is in a substantially liquefied phase.
  • the natural gas is “liquefied.”
  • the liquefied natural gas is then stored in the containment structure 30 , and is ready for transport on the vessel to an import terminal.
  • the ship's propulsion system 43 is preferably shut down.
  • the ship's power generator 41 diverts power to the liquefaction process facilities 40 .
  • the gas processing system 40 is shut down, and the ship propulsion system 43 is started.
  • the vessel 100 then transports the cryogenic cargo to the import location.
  • the gas Upon arrival at an import terminal, the gas is off-loaded.
  • the gas In order to off-load the gas, the gas is pumped through the gas processing facility 40 so as to heat the natural gas from a temperature where the natural gas is in its substantially liquefied phase, to a temperature where the natural gas is converted back to its gaseous phase.
  • the natural gas is then off-loaded through the gas transfer system 50 .
  • the ship's propulsion system 43 is again shut down, and the cryogenic cargo is regasified as it is unloaded from the vessel 100 . This allows for optionally an integrated power generator for both the ship's propulsion system 43 and the gas processing facility 40 .
  • partially regasified fluids are pumped into a gas storage device on land.
  • a gas storage device on land.
  • An example is a salt dome cavern facility.
  • the gas storage device is integrated with the vessel to store pressurized gas off-loaded at the gas receiving terminal.
  • the facility can be sized to supply continuous gas at the average delivery rate between deliveries. Pressurized gas storage is ideal because the cryogenic fluid can be inexpensively pumped to storage pressures before vaporization rather than having expensive gas compression with the storage facility.
  • an LNG transportation vessel is provided, and that a method for transporting LNG or other hydrocarbon fluids is also provided.
  • the method of transporting in one aspect, combines liquefaction, transportation and regasification processes.
  • an integrated system is provided for transporting natural gas.

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
US11/665,889 2004-11-05 2005-10-17 Lng Transportation Vessel and Method For Transporting Hydrocarbons Abandoned US20080127673A1 (en)

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CA2585211A1 (en) 2006-05-18
JP2008519210A (ja) 2008-06-05
KR20070085611A (ko) 2007-08-27

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