Small-scale hydrogen liquefaction system equipped with cryocooler

A small-scale hydrogen liquefaction system employing multiple cryocoolers to liquefy gaseous hydrogen through multiple cooling stages, the system comprising:

• a gas supply line to supply a gaseous hydrogen;
• n cryocoolers each connected to the gas supply line to be connected in parallel and configured such that the gaseous hydrogen supplied from the gas supply line is divided into n portions, and the n portions flow through the n cryocoolers, respectively, and are cooled to a liquefaction temperature, wherein n is a natural number equal to or greater than 2;
• n heat exchangers each attached to a cold head of each of the n cryocoolers;
• and
• a low-temperature chamber providing an accommodation space to accommodate the n cryocoolers therein,
• wherein the heat exchangers attached to the respective cold heads each are a tube-cylinder heat exchanger (TCHX) in which a tube through which gaseous hydrogen flows is wound around an outer surface of a cylinder.

A small-scale hydrogen liquefaction system employing multiple cryocoolers to liquefy gaseous hydrogen through multiple cooling stages, the system comprising:

• a gas supply line to supply a gaseous hydrogen;
• n cryocoolers each connected to the gas supply line to be connected in parallel and configured such that the gaseous hydrogen supplied from the gas supply line is divided into n portions, and the n portions flow through the n cryocoolers, respectively, and are cooled to a liquefaction temperature, wherein n is a natural number equal to or greater than 3;
• n heat exchangers each attached to a cold head of each of the n cryocoolers;
• and
• a low-temperature chamber providing an accommodation space to accommodate the n cryocoolers therein,
• wherein the low-temperature chamber includes:
• an outer chamber providing an accommodation space to accommodate the pre-cooling heat exchanger and the n cryocoolers therein;
• a liquefaction chamber installed in the outer chamber and containing liquid hydrogen liquefied by the condensation plates;
• and
• an upper plate installed at an upper end of the outer chamber and fixing the pre-cooling heat exchanger and the n cryocoolers.

A small-scale hydrogen liquefaction system employing multiple cryocoolers to liquefy gaseous hydrogen through multiple cooling stages, the system comprising:

• a gas supply line to supply a gaseous hydrogen;
• n cryocoolers each connected to the gas supply line to be connected in parallel and configured such that the gaseous hydrogen supplied from the gas supply line is divided into n portions, and the n portions flow through the n cryocoolers, respectively, and are cooled to a liquefaction temperature, wherein n is a natural number equal to or greater than 2;
• n heat exchangers each attached to a cold head of each of the n cryocoolers;
• a low-temperature chamber providing an accommodation space to accommodate the n cryocoolers therein;
• a vertical bar installed at a lower end of at least one of the n cryocoolers;
• and
• a plurality of temperature sensors arranged at regular intervals on a surface of the vertical bar to detect a level of liquid hydrogen in the liquefaction chamber and to determine stop timing of the hydrogen liquefaction system.

A small-scale hydrogen liquefaction system employing multiple cryocoolers to liquefy gaseous hydrogen through multiple cooling stages, the system comprising:

• a gas supply line to supply a gaseous hydrogen;
• n cryocoolers each connected to the gas supply line to be connected in parallel with each other and configured such that the gaseous hydrogen supplied from the gas supply line is divided into n portions, and the n portions flow through the n cryocoolers, respectively and are cooled to a liquefaction temperature, wherein n is a natural number equal to or greater than 2;
• n condensation plates arranged to be in contact with the n cryocoolers, respectively, to liquefy the gaseous hydrogen, the n portions of which are cooled to the liquefaction temperature by the n cryocoolers, respectively;
• and
• a low-temperature chamber providing an accommodation space to accommodate the n cryocoolers therein.