The invention relates to a method of using an indirect heat exchanger comprising a plurality of heat exchange modules arranged in a rectangular grid. Each heat exchange module comprises a plurality of first and second fluid flow channels extending in a first and second direction. The indirect heat exchanger comprises first and second manifolds fluidly connecting the first and second fluid flow channels of one heat exchange module with the first and second fluid flow channels of adjacent heat exchange modules thereby forming one or more first fluid paths. The invention also relates to a facility for processing liquefied natural gas including at least one indirect heat exchanger as described above.

Systems and methods are provided for increasing the efficiency of liquefied natural gas production and heavy hydrocarbon distillation. In one embodiment, air within an LNG production facility can be utilized as a heat source to provide heat to HHC liquid for distillation in a HHC distillation system. The mechanism of heat transfer from the air can be natural convection. In another embodiment, heat provided by natural gas, or compressed natural gas, can be used for HHC distillation. In other embodiments, various other liquids can be used to transfer heat to HHC liquid for distillation.

A method and system for cooling a process fluid is disclosed. An inlet air stream of a turbine is cooled with an inlet air cooling system. Moisture contained in the cooled inlet air stream is condensed and separated from the cooled inlet air stream to produce a water stream in an open-loop circuit. The water stream is sprayed into an air cooler air stream. The combined air cooler air stream and sprayed water stream is directed through an air cooler. Heat is exchanged between the process fluid and the combined air cooler air stream and sprayed water stream to thereby condense, chill, or sub-cool the process fluid.

A highly efficient refrigeration system and process for precooling of a hydrogen feed stream with concurrent nitrogen liquefaction is disclosed. The disclosed refrigeration system and associated methods employ a reverse Brayton refrigeration cycle using a nitrogen based refrigerant and a fully integrated three pinion bridge (BriM) machine operatively coupling at least two turbine/expanders and at least four nitrogen refrigerant compression stages.

An apparatus and process for pre-liquefaction processing of a fluid (e.g. hydrogen) can permit a reduction in capital costs and also an improvement in operational efficiency in flexibility. Embodiments can be configured to account for large variations in feed to be provided for liquefaction and also permit capital cost reductions associated with pre-liquefaction processing so the overall capital cost for liquefaction can be greatly reduced while also providing improved operational flexibility. For instance, embodiments can be configured to utilize one or more common pre-liquefaction processing elements to treat a fluid for pre-cooling of a fluid to a pre-selected liquefaction feed temperature.

An apparatus and process for processing of a fluid (e.g. hydrogen) for liquefaction can permit a reduction in power consumption and also an improvement in operational efficiency in flexibility. Embodiments can be configured to account for large variations in feed to be provided for liquefaction and also permit operational cost reductions associated with liquefaction processing so the overall power consumption and operational cost for liquefaction can be greatly reduced while also providing improved operational flexibility. For instance, embodiments can be configured to feed a fluid to multiple liquefiers of a train of liquefiers based on a pre-selected set of feed routing criteria for improving power consumption and providing greater operational flexibility for liquefaction operations.

The invention relates to a method for providing high-pressure oxygen using low-pressure oxygen containing water, in which method the low-pressure oxygen is subjected to a drying process and subsequently to a pressure increase, the drying process comprising an adsorption step. In the adsorption step, a regeneration gas is used which is provided using oxygen that is provided using the pressure increase and using at least part of the low-pressure oxygen. The pressure increase is performed above 0 C. and using a plurality of compressors or compressor stages which have an intercooler between two compressors and/or compressor stages. At least part of the oxygen which is used to form the regeneration gas is removed from the pressure increase between two of the compressors or compressor stages upstream of the intercooler. Alternatively, the pressure increase is carried out by means of internal compression.

The invention relates to a method for cooling hydrogen, in which method liquefied natural gas is heated by indirect heat exchange in a first heat exchanger with an intermediate fluid flow, the intermediate fluid flow is cooled, a hydrogen gas flow is cooled in a second heat exchanger without being condensed, and a gas flow derived from the cooled intermediate fluid is heated in a second heat exchanger to a temperature of between 150 C. and 90 C., which gas flow is withdrawn from the second heat exchanger at said temperature and compressed in a compressor with an inlet temperature of between 150 C. and 90 C.

Disclosed is a device for refrigerating or liquefying a fluid such as natural gas or hydrogen, comprising a fluid circuit that is to be cooled and has an upstream end for connection to a source of gaseous fluid as well as a downstream end for connection to a member for collecting the cooled or liquefied fluid, the device comprising a heat exchanger assembly in heat exchange with the fluid circuit to be cooled, the device comprising a refrigerator in heat exchange with at least a portion of the exchanger assembly, the refrigerator being of the type that has a cycle for refrigerating a cycle gas containing at least one of: helium, hydrogen, nitrogen or neon; said refrigerator comprising in series in a cycle circuit: a mechanism for compressing the cycle gas, at least one member for cooling the cycle gas, a mechanism for expanding the cycle gas, and at least one member for reheating the expanded cycle gas, wherein the compression mechanism comprises a plurality of compression stages in series composed of a centrifugal compressor assembly, the compression stages being mounted on a set of shafts that are rotationally driven by a motor assembly, the at least one member for cooling the cycle gas comprising at least one heat exchanger at the outlet of at least one compression stage in heat exchange with the cycle circuit, said heat exchanger being cooled by a heat transfer fluid, characterized in that the compression mechanism comprises at least two compression stages that are arranged successively in series and do not include any member for cooling the cycle gas such as a heat exchanger therebetween.

A carbon dioxide recovery system of the present disclosure includes an outdoor unit of a first heat pump device, the outdoor unit including a heat exchanger and a first blower, a recovery unit that has an adsorbent onto which carbon dioxide is adsorbable and is configured to recover carbon dioxide from air, and a separation unit configured to separate the carbon dioxide from the adsorbent moved from the recovery unit, in which the first blower sends out an airflow heated by the heat exchanger toward the separation unit in a case where the first heat pump device performs a cooling operation.