A LARGE TURBOCHARGED TWO-STROKE UNIFLOW CROSSHEAD INTERNAL COMBUSTION ENGINE

Described is a large turbocharged two-stroke uniflow crosshead internal combustion engine, which has at least one mode of operation in which the main fuel is a low flash point fuel, such as ammonia, methanol, ethanol, DME, methane, ethane or LPG, the engine comprising at least one cylinder with a cylinder liner (1), a reciprocating piston (10) therein and cylinder cover (22) covering the cylinder, a combustion chamber formed inside the cylinder between the reciprocating piston (10) and the cylinder cover (22), a low flash point fuel system (30) comprising fuel supply and return lines (36, 38) and configured for supplying pressurized fuel to at least one fuel valve (50) that is arranged in the cylinder cover (22) or in the cylinder liner (1), and a purging system for evacuation of the low flash point fuel from the fuel supply and return lines (36, 38). The engine is peculiar in that said purging system comprises means (40, 75, 41) for directing liquid, such as water or diesel, through at least the fuel supply and return lines (36, 38) of the low flash point fuel system (30). Hence, the low flash point fuel can be evacuated from the fuel system in a safe and economic way, where the low flash point fuel may be collected in a tank for reuse as fuel and a costly and complicated handling of a mixture of nitrogen and fuel is avoided, as no inert gas, such as nitrogen is used for purging.