The present disclosure relates to a hydrogen liquefaction system and hydrogen liquefaction method capable of increasing a hydrogen liquefaction amount through a pre-cooling process, and may comprise a hydrogen pipe, where gaseous hydrogen is introduced at a front end, heat exchange occurs in a heat exchange section leading to liquefaction of gaseous hydrogen into liquid hydrogen, and liquefied liquid hydrogen can be discharged at a rear end; a pre-cooling device formed between the front end of the hydrogen pipe and the heat exchange section, pre-cooling gaseous hydrogen; and a cooling cycle device, which is in thermal contact with the heat exchange section of the hydrogen pipe so as to perform heat exchange with the heat exchange section of the hydrogen pipe such that pre-cooled gaseous hydrogen can be liquefied into liquid hydrogen.

An apparatus is provided for maintaining a steady flow rate and pressure of a carbon dioxide stream at high pressure when a low-pressure source of the carbon dioxide varies with time. Liquid level in an accumulator that is sized to accommodate variations in supply rate is controlled by sub-cooling of liquid entering the accumulator and heating in the accumulator, the sub-cooling and heating being controlled by a pressure controller operable in the accumulator.

A method of producing liquefied natural gas (LNG) is disclosed. A natural gas is compressed in at least two serially arranged compressors to a pressure of at least 2,000 psia and cooled to form a cooled compressed natural gas stream. The cooled compressed natural gas stream is additionally cooled to a temperature below an ambient temperature to form an additionally cooled compressed natural gas stream, which is expanded in at least one work producing natural gas expander to a pressure that is less than 3,000 psia and no greater than the pressure to which the at least two serially arranged compressors compress the natural gas stream, to thereby form a chilled natural gas stream. The chilled natural gas stream is liquefied by indirect heat exchange with a refrigerant to form liquefied natural gas and a warm refrigerant. The cooled compressed natural gas stream is additionally cooled using the warm refrigerant.

The invention relates to a method and apparatus for partially solidifying a methane comprising stream. The method comprisesproviding a liquid methane comprising stream (30) at a first pressure (P1),passing the liquid methane comprising stream (30) to a slush vessel (300) which is kept at a second pressure (P2), the second pressure (P2) being lower than the first pressure (P1), thereby cooling and at least partially solidifying the methane comprising stream (30) generating a methane comprising slush, andcollecting the methane comprising slush.

Disclosed herein is a BOG reliquefaction system for LNG vessels. The BOG reliquefaction system includes a compressor compressing BOG, a heat exchanger cooling the compressed BOG by exchanging heat between the compressed BOG and BOG used as a refrigerant, and an expansion unit for expanding the BOG having been cooled by the heat exchanger, wherein the heat exchanger includes a core, in which heat exchange between a hot fluid and a cold fluid occurs, the core including a plurality of diffusion blocks, and a fluid diffusion member diffusing a fluid introduced into the core or a fluid discharged from the core.

Closed-loop refrigeration cycles for liquid oxygen densification are disclosed. The disclosed refrigeration cycles may be turbine-based refrigeration cycles or a Joule-Thompson (JT) expansion valve based refrigeration cycles and include a refrigerant or working fluid comprising a mixture of neon or helium together with nitrogen and/or oxygen.

A method of cooling a process stream with an auxiliary stream is described, wherein the exchange of heat between the process stream and the auxiliary stream is effected in a first heat exchanger and a second heat exchanger connected downstream thereof.

A process for liquefying methane-rich gases comprising providing a stream of feed methane-rich gas at a pressure of from 40 bar to 120 bar and containing higher hydrocarbons; providing a stream of methane-rich recycle gas at a pressure of from 40 bar to 120 bar; mixing the feed gas with a first part of the recycle gas; passing the resulting mixture to a gas expander, the expander outlet having a pressure of between 3 bar and 50 bar, so as to form a mixture of vapor and a condensed liquid containing higher hydrocarbons; separating the expander outlet stream into a liquid stream and a vapor stream; reheating and compressing said vapor stream to a pressure of from 40 bar to 120 bar to form a first constituent of the above-said recycle gas; cooling a second part of the said recycle gas to a temperature higher than the outlet temperature of the said expander; passing said cooled second part of the recycle gas into a liquefaction unit to form liquefied methane and a second vapor stream; reheating and compressing said second vapor stream to a pressure of from 40 bar to 120 bar to form a second constituent of the above-said recycle gas.

The invention relates to a facility for the liquefaction of hydrogen in a cryogenic liquefied-hydrogen store, via a downstream end of a circuit for hydrogen that is to be cooled, the cryogenic store being equipped with a withdrawing pipe configured to allow liquefied hydrogen to be supplied to at least one tank that is to be filled, particularly a mobile tank, the facility comprising a set of heat exchangers in a heat exchange relationship with the circuit for the hydrogen that is to be cooled, and a cooling device in a heat exchange relationship with the set of heat exchangers, said cooling device comprising a refrigerator with a cycle-gas refrigeration cycle, the facility comprising at least a first pipe for recovering boil-off gas, comprising a first end intended to be connected to a tank and a second end connected to the downstream end of the circuit for the hydrogen that is to be cooled, said first recovery pipe comprising at least a cryogenic compressor and a portion in a heat exchange relationship with at least a part of the set of heat exchangers, the first recovery pipe being configured to recover the boil-off hydrogen, compress it and then cool it and mix it with the liquefied hydrogen at the downstream end of the hydrogen circuit.

A precool heat exchanger system receives a stream of first cryogenic fluid for warming a second cryogenic fluid. A first splitter receives and divides a first cryogenic fluid stream into a motive stream and a secondary cooling stream. An ejector receives the motive stream. An expansion device receives and expands the secondary cooling stream and directs at least a portion of it to the precool heat exchanger system so that a second cryogenic fluid is cooled. First cryogenic fluid from the precool heat exchanger is directed into the ejector suction port and the pressure therein is reduced. A primary separation device divides a first cryogenic fluid mixed phase stream from the ejector into a first cryogenic fluid vapor stream and a liquid recycle stream that exit the primary separation device. A recycle pump directs first cryogenic fluid to the first splitter.