The development of the “Ultra Clean Marine Diesel Engine†is expected to complete the offshore operation test within 5 years, and its ground test will be completed within 3 and a half years. The research and development is divided into three parts: the "low-speed diesel engine" group with Mitsubishi Heavy Industries as the main body, the "medium speed diesel engine" group with Niigata prime mover as the main body, and the "small high-speed diesel engine" group with Yanmar as the main body. At present, the preparation work for each project is progressing smoothly.
In terms of low-speed machine development, Mitsubishi Heavy Industries and Akasaka Iron Works are developing SCR (Selective Catalytic Reduction Unit) for four-stroke and two-stroke diesel engines in order to achieve the goal of reducing nitrogen emissions by 60% to 80%. 370 million yen. In the development of medium-speed machines, Niigata prime movers, Daihatsu diesel engines and Mitsui Shipbuilding Co., Ltd. aim to reduce nitrogen emissions by 80%. For medium-speed four-stroke diesel engines, SCR denitration devices that can cope with fuel improvement and high-temperature exhaust gas are being developed. The total cost of technology development and development is about 640 million yen. In the research and development of small high-speed diesel engines, since the fuel of the small high-speed main engine is mainly low-sulfur A heavy oil and the machine is placed in a small space, how to realize the miniaturization of the denitration device has become an important issue to be solved. In the auxiliary machine, since C heavy oil is used as fuel, the development of a denitration device for high-concentration sulfur has become an important issue.
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