Semi-permanent use of lubricating oil and No waste oil in marine diesel engines

摘要

In the conventional system of lubrication, lubricating oil is renewed with fresh oil after it is used for some period. Accordingly, waste oil is generated in the conventional system. The authors have developed a new system that makes it possible to use lubricating oil semi-permanently without oil renewal. In the new system, therefore, no waste oil is generated and it is enough to supply only a small amount of fresh oil sometimes to compensate for the lost oil. This system has been working well in about 1000 units of marine and cogeneration diesel engines in practice. The new system always keeps the lubricating oil dean as the kidney of animals always keeps their blood clean. This is why lubricating oil can be used semi-permanently and the new system is called kidney system. This paper reports the theory, the process of R&D and the results of practical use of the new technology.