A system for supplying fuel to an engine of a ship. The system includes a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine, a hydraulic motor driving the high pressure pump and a chamber carrying the high pressure pump and the hydraulic motor. The chamber is substantially free of electric sparks.

A VOC fuel supply system and method for supplying volatile organic compounds (VOCs) as fuel of an engine and a vessel using VOCs as fuel. The VOC fuel supply system includes: an engine operable in a gas fuel mode using a gas as fuel; a VOC supply unit supplying VOCs (Volatile Organic Compounds) as fuel to the engine; a fuel supply line connecting the VOC supply unit to the engine and defining a path for transfer of a gaseous VOC fuel from the VOC supply unit to the engine; and a drain filter provided to the fuel supply line upstream of the engine and filtering out recondensed liquid VOCs contained in the VOC fuel.

A VOC fuel supply system and method for supplying volatile organic compounds (VOCs) as fuel of an engine and a vessel using VOCs as fuel. The VOC fuel supply system includes: an engine operable in a gas fuel mode using a gas as fuel; a VOC supply unit supplying VOCs (Volatile Organic Compounds) as fuel to the engine; a fuel supply line connecting the VOC supply unit to the engine and defining a path for transfer of a gaseous VOC fuel from the VOC supply unit to the engine; and a drain filter provided to the fuel supply line upstream of the engine and filtering out recondensed liquid VOCs contained in the VOC fuel.

An ammonia mixed combustion engine 1 that operates by burning ammonia and a hydrocarbon liquid fuel causes a control unit 2 to implement at least one of decrease or increase in an air excess ratio in fuel, advance or retard in injection timing of the liquid fuel, and decrease or increase in injection pressure of the liquid fuel in accordance with increase or decrease in a mixed fuel burning ratio of ammonia in the fuel.