System and method for supplying liquefied hydrogen

A system for supplying liquefied hydrogen, comprising:

• at least one liquefied hydrogen storage tank configured to store liquefied hydrogen and comprising a temperature control unit configured to control an internal temperature of the at least one liquefied hydrogen storage tank to maintain an inside of the at least one liquefied hydrogen storage tank at a first pressure;
• at least one pressure tank configured to receive liquefied hydrogen to be supplied to a liquefied hydrogen demand site from the at least one liquefied hydrogen storage tank and store the received liquefied hydrogen, the at least one pressure tank having a smaller capacity than the at least one liquefied hydrogen storage tank and maintained at a second pressure higher than the first pressure of the at least one liquefied hydrogen storage tank;
• a liquefied hydrogen supply line comprising a flow path through which liquefied hydrogen is transferred from the at least one pressure tank to the liquefied hydrogen demand site;
• a compressor configured to compress boil-off hydrogen gas generated in the at least one liquefied hydrogen storage tank and supply the compressed boil-off hydrogen gas to the at least one pressure tank to generate a pressure required for delivery of liquefied hydrogen from the at least one pressure tank to the liquefied hydrogen demand site;
• an energy conversion unit configured to produce electric power using boil-off gas compressed by the compressor as a fuel;
• a buffer tank configured to temporarily store boil-off gas compressed by the compressor and maintained at a third pressure higher than the second pressure of the at least one pressure tank;
• a first boil-off gas distribution line through which boil-off gas is supplied from the buffer tank to the at least one pressure tank;
• and
• a second boil-off gas distribution line through which boil-off gas is supplied from the buffer tank to the energy conversion unit;
• a first return line through which boil-off gas generated at the liquefied hydrogen demand site and the liquefied hydrogen supply line during supply of liquefied hydrogen to the liquefied hydrogen demand site is returned to the at least one pressure tank to be used to generate a pressure required for delivery of liquefied hydrogen from the at least one pressure tank to the liquefied hydrogen demand site;
• and
• a second return line through which boil-off gas generated at the liquefied hydrogen demand site and the liquefied hydrogen supply line during supply of liquefied hydrogen to the liquefied hydrogen demand site is returned to the compressor to be supplied to the at least one pressure tank or the energy conversion unit, and
• wherein the temperature control unit comprises:
• a first heat transfer medium flow path to allow a heat transfer medium to flow therein and configured to maintain at least a portion of the stored liquefied hydrogen at a first temperature being a densification temperature;
• and
• a second heat transfer medium flow path to allow the heat transfer medium to flow therein and configured to maintain at least a portion of the stored liquefied hydrogen at a second temperature higher than the first temperature.