| abstract |
The ship is equipped with a general fuel (C heavy oil) tank 3 and a low sulfur fuel (A heavy oil) tank 4. In the exhaust system of the engine 1, an SCR catalyst 10 of the urea water spray system is disposed, and a bypass exhaust pipe 16 through which the exhaust gas passes without passing through the SCR catalyst 10 is disposed. By combining the vessel position automatic detection means (B) and the regulation map, the distance to the regulated sea area is automatically calculated, and the fuel is automatically switched from the normal fuel to the low sulfur fuel in accordance with the arrival of the regulated sea area. Gas flows into the bypass exhaust pipe 16 to stop the function of the SCR catalyst 10. Switching of the exhaust gas purifying state is automatically performed. |