The rest of 4 ships are equipped with the steam turbine, and their total output of 85,895kW (116,817PS) increased by 26,795kW (36,441PS) of 1 ship.
Table2.2-1 Output Classification of Main Engines Mounted on Newly-Classed Ships
Note) All 275 ships on which 2-stroke engine is mounted are 1-engine and 1-shaft ship. Among 84 4-stroke engine mounted ships, 39 are of 1-engine and 1-shaft type, 45 are of 2-engine and 2-shaft type.
2.3 Studies at Ship Research Institute
Since the emission control from ships by IMO (the International Maritime Organization) will be scheduled to come into force on after January 1, 2000 and the substances to cause the global warming effect are regarded as a problem, Power and energy engineering division in Ship Research Institute has been challenging the researches concerning reduction of harmful exhaust gas to be emitted from marine engines.
Studies in 1998
(1) A study on water emulsion fuel
As the long-term field test of the power generating system using water emulsion fuel on training ship Nippon-maru, which was joint research with the Institute for Sea Training, was finished, the data analysis was carried out. As a result, it was verified that the water emulsion fuel was effective for the NOx reduction on the actual ship as shown in Fig. 2.3-1.
On the other hand, it was proposed from the inspection parts of the fuel injection system and the analysis of the deposit on the combustion chamber, that the use of appropriate parts and some change of the configuration of the combustion chamber are necessary for good combustion with water emulsion fuel.
(2) A study on the emission characteristics in combined use of water emulsion fuel with EGR NOx reduction tests on a small high speed diesel engine in combined use of the water emulsion fuel with EGR were carried out. As a result, it was confirmed that the more reduction of NOx can be achieved with EGR in addition to the effect by the water emulsion fuel.
