SYSTEM AND METHOD FOR SUPPLYING FUEL GAS FOR A SHIP

摘要

The present invention relates to a system and a method for supplying fuel gas for a ship, which are capable of supplying fuel gas in response to a methane number required by an engine which can compress and vaporize liquefied natural gas (LNG), and can receive the LNG to use as fuel. According to the present invention, a system for supplying fuel gas for a ship and a method for supplying fuel gas using the system are provided. The system for supplying fuel gas for a ship comprises a storage tank which stores LNG, and an engine which receives the LNG stored in the storage tank to use as fuel. More specifically, the system includes: a compressor line which compresses BOG generated in the storage tank by a compressor and supplies the BOG as fuel to the engine; a high-pressure pump line which compresses LNG contained in the storage tank by a high-pressure pump and supplies the LNG as fuel to the engine; an expansion valve which is provided on the high-pressure pump line to decompress the LNG compressed by the high-pressure pump up to pressure required by the engine; and a vapor-liquid separator which is provided on the high-pressure pump line to adjust a methane number of LNG to a value required by the engine by separating hydrocarbon components from the LNG decompressed through the expansion valve.