Hydrogen liquefaction device and liquefied hydrogen supply system

A liquefied hydrogen supply system comprising:

• a transport module including a mobile trailer or a container that is movable by being towed by a transport means or loaded on the transport means;
• a hydrogen liquefaction device installed on one side of the transport module to generate hydrogen in a gaseous state into liquefied hydrogen in a liquid state;
• a utility module installed on other side of the transport module to supply utilities required for the hydrogen liquefaction device;
• and
• a hydrogen supply module installed on another side of the transport module to store or generate hydrogen in a gaseous state to be supplied to the hydrogen liquefaction device,
• wherein the hydrogen liquefaction device includes:
• a cradle that forms an accommodating space in which a mobile storage container capable of storing liquefied hydrogen or a mobility that uses liquefied hydrogen as a power source can be accommodated, being formed to be movable;
• and
• a liquefier installed on one side of the cradle, cooling hydrogen in a gaseous state supplied from the hydrogen supply module to a temperature which is equal to or below liquefaction temperature to generate liquefied hydrogen in a liquid state so as to supply liquefied hydrogen to the mobile storage container or the mobility, or recover vaporized gas generated from the mobile storage container in which liquefied hydrogen is stored or from the mobility for re-liquefaction into liquefied hydrogen.

A hydrogen liquefaction device comprising:

• a cradle that forms an accommodating space in which a mobile storage container capable of storing liquefied hydrogen or a mobility that uses liquefied hydrogen as a power source can be accommodated, being formed to be movable;
• and
• a liquefier installed on one side of the cradle, cooling hydrogen in a gaseous state supplied from outside to a temperature which is equal to or below liquefaction temperature to generate liquefied hydrogen in a liquid state so as to supply liquefied hydrogen to the mobile storage container or the mobility, or recover vaporized gas generated from the mobile storage container in which liquefied hydrogen is stored or from the mobility for re-liquefaction into liquefied hydrogen;
• wherein the liquefier includes:
• a liquefaction chamber that forms a liquefaction space into which hydrogen in a gaseous state supplied from outside is flowed and liquified;
• a cryocooler installed on one side of the liquefaction chamber, cooling hydrogen to a temperature which is equal to or below liquefaction temperature so as to liquefy hydrogen flowed into the liquefaction space;
• a supply line that connects an external hydrogen supply source and the liquefaction chamber so as to supply hydrogen to the liquefaction chamber;
• a discharge line that connects the liquefaction chamber and the mobile storage container, or connects the liquefaction chamber and the mobility so as to supply liquefied hydrogen generated in the liquefaction chamber to the mobile storage container or to the mobility;
• a recovery line that connects the mobile storage container and the liquefaction chamber, or connects the mobility and the liquefaction chamber, so as to recover vaporized gas generated from the mobile storage container or the mobility;
• and
• a vent port connected to the recovery line so as to vent at least a portion of vaporized gas generated and recovered from the mobile storage container or the mobility to outside;
• wherein the supply line is connected to a supply port formed at an upper part of the liquefaction space, where liquefied hydrogen is accommodated, in the liquefaction chamber, so as to allow hydrogen supplied from the hydrogen supply source to flow into the upper part of the liquefaction space,
• the discharge line is connected to a discharge port that is formed on a lower side of the liquefaction chamber, so as to discharge hydrogen generated in the liquefaction chamber to the accommodating space,
• the recovery line, during a process of recovering vaporized gas generated from the mobile storage container or the mobility towards the liquefaction chamber, is connected to a recovery port that connects the lower side of the liquefaction chamber and the supply port, so as to allow vaporized gas to flow into the liquefaction space in a mixed state with hydrogen supplied from the hydrogen supply source, and
• the vent port includes at least one or more following lines:
• a first vent line including a bypass valve so as to control pressure and flow rate of vaporized gas recovered to the recovery line;
• and
• a second vent line including a relief valve so that pressure of vaporized gas recovered to the recovery line does not exceed a predetermined pressure.