Fuel supply method for high-pressure natural gas injection engine

A fuel supply method of a fuel supply system for a high-pressure natural gas injection engine installed in a marine structure, characterized in that:

• the fuel supply system for the high-pressure natural gas injection engine comprises:
• a BOG compression unit configured to receive and compress BOG generated in a storage tank storing a liquefied gas;
• a reliquefaction apparatus configured to receive and liquefy the BOG compressed by the BOG compression unit;
• a high-pressure pump configured to compress the liquefied BOG generated by the reliquefaction apparatus;
• and
• a high-pressure gasifier configured to gasify the liquefied BOG compressed by the high-pressure pump and supply the gasified BOG to the high-pressure natural gas injection engine;
• the BOG generated in the storage tank is discharged from the storage tank and compressed in a medium pressure range;
• the compressed BOG is liquefied;
• and
• the liquefied BOG is compressed to a high pressure, gasified and supplied to the high-pressure natural gas injection engine,
• wherein the medium pressure range is 12 to 45 bara (absolute pressure);
• and
• all of the liquefied BOG is supplied to the high-pressure natural gas injection engine when an amount of fuel required by the high-pressure natural gas injection engine of the marine structure is larger than an amount of the BOG generated in the storage tank.