Liquid hydrogen vaporizer

A liquid hydrogen vaporizer that performs heat exchange between liquid hydrogen and a heating medium and that vaporizes liquid hydrogen, the liquid hydrogen vaporizer comprising:

• a fin tube that is configured of a tube through which liquid hydrogen flows and a fin assembly that is attached to an outer periphery of the tube;
• and
• a casing in which the heating medium flows on an outer side of the fin tube accommodated inside the casing,
• wherein the fin assembly is configured of
• a sleeve that is mounted on an outer surface of the tube, and
• a plurality of fins attached to an outer peripheral surface of the sleeve, and
• wherein the sleeve is slidable in a longitudinal direction of the tube,
• wherein the tube is configured of a single folded flow path in which an upper folded portion, a first lateral folded portion, a lower folded portion, and a second lateral folded portion are repeated in order with a straight pipe portion interposed between the upper folded portion, the first lateral folded portion, the lower folded portion, and the second lateral folded portion,
• wherein the fin assembly is provided in the straight pipe portion,
• wherein each of the fins is a plurality of strip-shaped plates in which a longitudinal direction extends in a radial direction from the outer peripheral surface of the sleeve, and each of the fins is attached to the sleeve such that a width direction is an extending direction of the sleeve,
• wherein the plurality of fins is arranged in a line with a gap along the extending direction of the sleeve.