The Shinho Maru, an ultra-modern energy-saving very large bulk carrier, features more than 11 innovations for energy-saving and minimizing the ship running cost per unit weight of bulk cargo, and these innovations are incorporated so as to achieve, as a whole, the reduction in fuel consumption, labor cost, and maintenance cost. For the above purpose, D-MAP MARK II diesel ship propulsion plant was employed with Mitsubishi electronic diesel engine remote control system as the plant control system. D-MAP MARK II plant contains a thyristor-controlled shaft generator, in addition to the basic economizer/ turbogenerator system design. The propulsion plant and its control system proved quite successful, true to the expectation.
With regard to possibilities of burning gas fuel on the conventional diesel engine keeping its superior features, the following items were studied. (1) Performance tests were conducted on a test engine. The thermal efficiency equivalent to conventional diesel engine was confirmed to be kept with gas fuel. (2) Basing on the test results, the application design for the fuel system and the governing system was made. The design for the LNG carrier was also carried out, taking into account the arrangement of the gas injection diesel engine, the gas delivery compressor and some special accessories. (3) Feasibility study on propulsion machinery for the LNG carrier was done. As a result, it is found that the LNG carrier with the gas injection diesel engine is more advantageous as compared with the other propulsion machineries.