7. Consideration
One of the conditions for this test was not to cause any troubles in the navigational plan or the maintenance plan since the practical training must be fulfilled.
The technology to reduce the NOx concentration by using the emulsified fuel in the diesel engine for the electric generator has been substantially established on the laboratory level, and the targets of this test were as follows:
1] Operation for a long time onboard the ship;
2] Examination of the influence of the long-term continuous operation on the diesel engine; and
3] Verification that the emulsified fuel manufacturing device is adaptable for the severe environment onboard the ship.
Fortunately enough, the satisfactory results could be obtained with the results of at least 2,000 hours, and it is considered significant that the test was carried out using the diesel engine for the electric generator whose load was roughly fluctuated. The author feels happy if the results of this test will be of help to the research and development toward the year 2,000.
The authors express their gratitude to those in the Internal Combustion Engine laboratory, Engine Power Department and the Function Evaluation Laboratory of Material Machining Department of the Ship Research Institute for their advice to the measurement of the NOx concentration in the exhaust gas and the determination of the appropriate research condition, and the cooperation in the analysis of the materials and the observation of the parts, and to the crew onboard Nippon Maru for their cooperation on the implementation of the research.
Literature: (Being omitted)
Questions and Answers:
1) Question: The drain was periodically removed from the bottom part of the secondary filter of the piping system, and what are the frequency and the drain stored a day?
Answer: The drain of about 100 to 150 ml (completely separated into water) was discharged once a day.
2) Question: The switching time from the emulsified fuel to the A-oil was reported to be about 1 hour, and how was the switching judged? What will be the switching time of the fuel oil if the water addition ratio is increased?
Answer: The switching time is defined as the time at which the leaked oil from the fuel injection valve is changed from the emulsified fuel to the A-oil. If the water addition ratio is increased, the quantity of the A-oil to the emulsified fuel at the same discharge rate is decreased; and the discharge rate is increased by increasing the rack quantity (the discharge capacity of the fuel injection pump), and it seems that there is little difference in the switching time of the fuel oil.
Reference
1) Nishio, et al., MEST Regular Session in Autumu (1997) P.62
2) Yamashita, et al., MEST Regular Session Autumu (1996) P.18-20
3) An investigation on purification of the exhaust gas by emulsification of fuels, MESJ Report No.34 (1997)
