Fuel gas supply system for supplying a high-pressure gas injection engine with gas stored in a liquefied gas tank, preferably an LNG tank, having a high-pressure pump to which liquefied gas is supplied. The system including a condenser with a high-pressure heat exchanger, a high-pressure vaporizer which is connected to the high-pressure pump via the high-pressure heat exchanger and is arranged downstream of the condenser. Gas fed to the high-pressure gas injection engine downstream of the high-pressure evaporator. A compressor to which boil-off gas is fed is connected downstream to the condenser via an inlet. A condensation core generator to which liquid gas is supplied from the high-pressure pump in such a manner that the condensation nuclei generated by the condensation nucleus generator promote condensation of the supplied boil-off gas. The liquid gas formed in the condenser is supplied to the high-pressure pump and/or to the liquid gas tank.

The disclosure relates to a method and apparatus for cooling, preferably liquefying a boil off gas (BOG) stream from a liquefied cargo in a floating transportation vessel, said liquefied cargo having a boiling point of greater than −110° C. at 1 atmosphere and comprising a plurality of components, said method comprising at least the steps of: compressing a boil off gas stream (01) from said liquefied cargo in two or more stages of compression comprising at least a first stage (65) and a final stage (75) to provide a compressed BOG discharge stream (06), wherein said first stage (65) of compression has a first stage discharge pressure and said final stage (75) of compression has a final stage suction pressure and one or more intermediate, optionally cooled, compressed BOG streams (02, 03, 04) are provided between consecutive stages of compression; cooling the compressed BOG discharge stream (06) to provide a cooled vent stream (51) and a cooled compressed BOG stream (08); expanding, optionally after further cooling, a portion of the cooled compressed BOG stream (08) to a pressure between that of the first stage discharge pressure and the final stage suction pressure to provide an expanded cooled BOG stream (33); heat exchanging the expanded cooled BOG stream (33) against the cooled vent stream (51) to provide a further cooled vent stream (53).

A hydrogen fuel supply system 1 comprises a tank 2 which stores liquid hydrogen therein; a supply line 4 which takes the liquid hydrogen out of the tank 2, vaporizes the liquid hydrogen into a hydrogen gas, and supplies the hydrogen gas to a use point 3; and a pressurization line 5 which compresses the hydrogen gas generated by vaporization of the liquid hydrogen inside the tank 2 by use of a compressor 59 so that a pressure of the hydrogen gas is increased, and sends the hydrogen gas with the increased pressure to a gaseous phase part inside the tank 2.

A system for reliquefying a boil off gas generated in a storage tank includes a first compressor compressing a partial amount (hereinafter, referred to as ‘fluid a’) of boil off gas discharged from the storage tank, a second compressor compressing another partial amount (hereinafter, referred to as ‘fluid b’) of boil off gas discharged from the storage tank, a second expanding unit expanding a partial amount (hereinafter, referred to as ‘fluid c’) of a flow formed as the fluid a and the fluid b join, a heat-exchanger cooling another partial amount (hereinafter, referred to as ‘fluid d’) of the flow formed as the fluid a and the fluid b join, and a first expanding unit expanding the fluid d cooled by the heat-exchanger, wherein the heat-exchanger heat-exchanges the fluid d with the fluid c as a coolant expanded by the second expanding unit to cool the fluid d.

Provided is a liquefied gas treatment system for a vessel, which includes a cargo tank storing liquefied natural gas (LNG), and an engine using the LNG as fuel. The liquefied gas treatment system includes: a compressor line configured to compress boil-off gas (BOG) generated in the cargo tank by a compressor and supply the compressed BOG to the engine as fuel; a high pressure pump line configured to compress the LNG stored in the cargo tank by a pump and supply the compressed LNG to the engine as fuel; and a heat exchanger configured to liquefy a part of BOG, which is compressed by the compressor, by exchanging heat with BOG that is discharged from the cargo tank and transferred to the compressor.

A floating type LNG station floats on the sea and is used for refueling a ship or a marine structure using LNG. The floating LNG station comprises: a floating structure; an LNG tank which is prepared for storing LNG in the floating structure; an LNG line for discharging the LNG from the LNG tank to the ship or the marine structure; and an LNG pump which provides the LNG line with pumping force for discharging the LNG.

A refuelling device for supplying liquefied gas is provided, including a feed system adapted to place each reservoir in fluidic through connection with a tank and including withdrawal ducts for withdrawing the liquefied gas from the reservoirs; an inlet duct for introducing the liquefied gas into the tank; a collection manifold for conveying the withdrawal ducts into the inlet duct; a pump adapted to move the liquefied gas in the feed system; and a pressure gauge to measure the inlet pressure of the liquefied gas in the pump; and a valve adapted to regulate the flow in the inlet duct according to the inlet pressure.

The invention relates to a system for supplying a gaseous fuel that comprises a low temperature tank for receiving the fuel in its liquid aggregate state achieved by cooling and comprises a rail that is fluidically connected to at least one injector device for discharging gaseous fuel into a combustion space. The system is characterized in that it has a pressure store that is configured to receive gaseous fuel and that is fluidically connectable to both the low temperature tank and the rail to buffer fuel coming from the low temperature tank and to supply it to the rail.

A station and method for refilling a tank or tanks with pressurized gas in which liquefied gas is vaporized in a vaporizer. One portion of the vaporized gas is compressed to produce a compressed gas. Another portion of the vaporized gas is not compressed but instead is fed to a heat exchanger where it is used to cool the compressed gas. The thus-warmed gas is reinjected into a filling line that feeds the liquefied gas to the vaporizer.

An apparatus for reliquefaction of boil-off gas for a vessel, comprises: a compression unit for compressing the boil-off gas discharged from the storage tank; and a heat exchanger for heat-exchanging the compressed boil-off gas compressed by the compression unit with the boil-off gas discharged from the storage tank; a first expansion means for dividing the boil-off gas passing through the heat exchanger into at least two flows including a first flow and a second flow, and expanding the divided first flow; a first intercooler for cooling the second flow remaining after the division of the first flow by using the first flow expanded by the expansion means as a refrigerant; and a receiver for receiving a second flow having passed through the first intercooler, in which a downstream pressure of the compression unit is controlled by a flow discharged from the receiver.