The awareness-improvement training for marine engineers was considered as well as the CRM and the BRM training methods on the basis of the first principles of safe & efficient navigation and preventing accidents/incidents in the Marine Technical College. In this study, the importance of Team-Minds was explained, and a training framework was concretely developed and demonstrated. The training program was named “Team-Minds Producing training”, or the so-called “ETM (Engine-room Team Management) training”. It focuses especially on the quality of teamwork rather than individual skills. In this report, an overview of the proposed Team-Minds Producing Training was introduced.
The “Team-Minds Producing training” or the so-called “ETM (Engine-room Team Management) training” was developed by the Marine Technical College. The 1st report of this study introduced the background of the Team-Minds Producing training, the training framework and the training programs, etc.. In the next step, Team-Mind Producing trainings for active senior-class and junior-class marine engineers in ocean-going and coasting vessels was made open to the public and verified. In this report, the concrete contents and results concerning Team-Minds Producing trainings are presented. Furthermore, based on the results of questionnaires on awareness-improvement and training-contents, the validity of Team-Minds Producing training was discussed.
It seems that the ship management companies and marine engineers have been less aware of the water quality control of marine auxiliary boilers in general. A few years after the completion of a ship, auxiliary boilers of 1MPa or less have been experiencing some troubles caused by corrosion. One of these is the pitting corrosion in the entrance pipe near the internal feed pipe. Another is caused by the boiler water leakage. This paper investigates, therefore, these trouble cases, and describes the cause and its measures first. Next, the current state of the support system related to water quality control is investigated, and the obligation of related posts necessary for safety management is made clear. Lastly, the paper proposes the standardization of the log sheet for boiler water analysis to prevent troubles due to the incompleteness of the support system.
Now remotely operated underwater vehicle (ROV) becomes main tool to explore or to make work in the sea and high performance is expected as a usual matter. The authors have been studying how to improve the performance of robot arm on the ROV and proposed here a new technology to show the image of the objects more clearly with diminishing interference of robot arm as a 1st result. This technology uses computer graphics and builds 3D vision through the image of robot arm with it. That is as follows; when we get the interfering image of object and robot arm, we replace the image of robot with the graphic model and fill the interfered parts of object with the data without interference. This method proved usefulness with experiments and it is on the improvement for actual use now.
Polycyclic Aromatic Hydrocarbons (PAHs) are formed by incomplete combustion of fuels and discharged into the environment. Some compounds have been identified as carcinogenic, mutagenic, and teratogenic. Exhaust gas from a 4 stroke marine diesel engine was trapped in the resin and filters, and PAHs were analyzed by GC/MS. The relationship between PAHs emissions and the engine operating condition was examined. The results show that as the engine load increases, SOF concentration decreases. Low-molecular PAHs in gaseous state were trapped in the resin. On the other hand, high-molecular PAHs bound to particulate matter were trapped in the filter. PAHs emissions were highest when the engine was operated at 25% load using Heavy Fuel Oil (HFO). Highly toxic PAHs were also detected at this operating condition. PAHs from exhaust gas using HFO were more than those of Marine Diesel Oil. It is necessary to monitor and a accumulate data of PAHs emissions in the exhaust gas of marine diesel engines.
In this research an assist-injector was newly developed to improve the CO, THC and smoke emissions from a marine diesel engine fueled with vegetable oil. The effect of pre-injection and after-injection on the combustion characteristics and the exhaust emissions were investigated by engine test bench experiments. Results show that the assist-injector is effective for CO, THC and smoke emissions reduction. The reduction efficiency of CO, THC and smoke is about 30% with after-injection, and is over 50% with pre-injection.
In order to reduce NOx and Smoke emissions from diesel engines with coconut oil methyl ester (CME), emulsified coconut oil methyl ester (ECME) was made using crude glycerol which is a by-product of transesterification, as an emulsifier. The combustion characteristics and exhaust emissions of ECME were investigated using a DI diesel engine. ECME showed better stability than emulsified rapeseed oil methyl ester (ERME). NOx and Smoke emissions of ECME reduced when the water content was increased up to 20 mass%. ECME with a water content of 15 mass% has lower HC, CO, NOx and Smoke emissions compared to ERME with the same water content due to the lower exhaust emissions of the CME base fuel. From the experimental results, it is concluded that the combustion characteristics and exhaust emissions of emulsified biodiesel are affected by the base fuel.
Biodiesel fuel (BDF) is a renewable resource, and is a promising carbon neutral fuel. However, BDF has the properties of high viscosity and poor volatility. Therefore, the atomization of its spray seems to be inhibited, which results in problems such as severe engine deposits and injector coking. In this study, BDF is mixed with a low boiling fuel to improve its fuel properties. Ethanol was chosen as the fuel to be mixed with BDF because of its higher oxygen content, lower ignitability and higher volatility. The ethanol addition would exert a large influence on mixture formation, ignition, combustion, and exhaust emissions. In the experiments, the spray characteristics were measured by shadowgraph photography and Mie-scattered light photography, while the mixture concentration and ignitability were measured by chemiluminescence photography. The experimental results show that the liquid phase penetration decreased with increasing of the mixture ratio of ethanol to BDF, and the ignition timing and ignition position can be controlled by changing the mixture ratio of BDF and ethanol.