A method for operating an air separation unit during an unexpected disturbance is provided. The method can include the steps of: determining that a process disturbance has occurred; starting-up a liquid back-up system that is configured to deliver a product gas at a desired product pressure; and introducing compressed air from an air accumulator into the air separation unit at a location that is downstream a main air compressor and upstream a cold box, wherein the compressed air is introduced in an amount that is effective for maintaining nominal operation of the air separation unit during the process disturbance and until the liquid back-up system is delivering the product gas at the desired product pressure.

A device includes a heat exchanger having one end connected to an air line through which air flows, and the other end connected to a hydrogen line through which liquid-state hydrogen flows. The heat exchanger is configured to produce liquid-state air as the air and the liquid-state hydrogen exchange heat with each other. The device also includes an air storage container connected to the heat exchanger via the air line and configured to store the liquid-state air discharged from the heat exchanger, and an evaporator connected to the air storage container via the air line and configured to evaporate the liquid-state air, supplied from the air storage container, through heat exchange. The device additionally includes a power generator configured to receive the air, discharged from the evaporator, via the air line, thereby producing electrical power.

A device includes a heat exchanger connected to an air line through which air flows and to a hydrogen line through which liquid-state hydrogen flows. The heat exchanger is configured to produce liquid-state air as the air and the liquid-state hydrogen exchange heat with each other. The device also includes a carbon dioxide separator connected to the heat exchanger via the air line and the hydrogen line. The carbon dioxide separator is configured to separate at least a portion of carbon dioxide from the air. The device also includes an air storage container connected to the heat exchanger via the air line. The air storage container is configured to store the liquid-state air discharged from the heat exchanger. The carbon dioxide separator is configured such that the air and the hydrogen exchange heat with each other inside the carbon dioxide separator.

A device includes a heat exchanger connected to an air line through which air flows and to a hydrogen line through which liquid-state hydrogen flows. The heat exchanger is configured to produce liquid-state air as the air and the liquid-state hydrogen exchange heat with each other. The device also includes a carbon dioxide separator connected to the heat exchanger via the air line and the hydrogen line. The carbon dioxide separator is configured to separate at least a portion of carbon dioxide from the air. The device also includes an air storage container connected to the heat exchanger via the air line. The air storage container is configured to store the liquid-state air discharged from the heat exchanger. The carbon dioxide separator is configured such that the air and the hydrogen exchange heat with each other inside the carbon dioxide separator.

The invention relates to a facility and a method for the liquefaction of hydrogen, comprising a hydrogen circuit having an upstream end configured to be connected to a source of gaseous hydrogen and a downstream end connected to at least one store, the facility comprising a cold box housing a set of heat exchangers in a heat exchange relationship with the hydrogen circuit, the facility comprising a cooling device in a heat exchange relationship with at least part of the set of heat exchangers, the facility comprising a collecting pipe configured to collect boil-off gas and equipped with at least one upstream end connected to the store and/or a tank to be filled, and a downstream end connected to the hydrogen circuit, inside the cold box, said downstream end of the collecting pipe comprising, ahead of its connection to the hydrogen circuit, a portion in a heat exchange relationship with at least one heat exchanger of the set of heat exchangers.

Liquefaction systems and methods are disclosed that are adapted to process a natural gas stream having a substantial concentration of hydrogen and where the concentration of hydrogen may vary in the natural gas stream. In some implementations, an expanded liquefied natural gas stream may be separated into a hydrogen enriched endflash stream and a hydrogen depleted LNG stream, and a second gaseous hydrogen depleted stream may be produced from the hydrogen enriched endflash stream and/the hydrogen depleted LNG stream. In other implementations, the pressure of the endflash compressor may be controlled for the purpose of maintaining a hydrogen concentration in a fuel stream (often the endflash stream) within a desired range. Some implementations may include pre- or post-liquefaction purification using, for example, membranes, adsorption, partial condensation, distillation, stripping, and electrochemical membranes.