Analysis of the Requirement for the Ships Using Methanol as Fuel

Methanol is a safe, cost-effective alternative marine fuel. It is one of promised solution for being shipping fuel because of it feedstock and produces less pollution than fossil fuel. Methanol is one of new fuel in the shipping industry; because of that there are lack of regulation for this fuel. IMO has not release regulation of using methanol as fuel but there is some draft is in process. The document that can be found to represent the draft of IMO IGF Code is report of Sub-Committee of Carriage Cargo and Containers (CCC) 3-3. Classification society that has the regulation for using methanol is LR and DNV GL. Comparing the three regulations and selecting the regulation that has high safety level is the best way to design the methanol-fueled ship. The result shows that there still some different opinion on the three regulations that regulate the methanol as ship fuel. Some regulation also doesn’t mention about the detail material that should be use in the system. Calculation method to selecting pipes thickness also different. To make it safe, the thick one should be used. Implementation the regulation on board ship resulting loses the payload of their cargo. The specific fuel consumption will be increased by factor 46% compared to fuel oil SFOC and the storage tank shall be protected by cofferdam that takes a lot of space. To safe ships space the service tank is recommended put in the main deck to prevent the use of protective cofferdam

Concept for a LNG Gas Handling System for a Dual Fuel Engine

Nowadays, ships are using LNG as main engine fuel because based on the facts that LNG has no sulphur content, and its combustion process, LNG produces low NOx content compared to heavy fuel oil and marine diesel oil. LNG is not only produces low gas emission, but may have economic advantages. In the engine laboratory of maritime studies department in Warnemunde, Germany, there is a diesel engine type MAN 6L23/30 A, where the mode operation of these engine would be changed to dual fuel engine mode operation. Therefore, in this thesis, the use dual fuel engine will be compared where it will utilize natural gas and marine diesel oil and select the required components for fuel gas supply system. By conducting the process calculation, engine MAN 6L23/30 A requires the capacity natural gas of 12.908  for 5 days at full load. A concept for LNG supply system would be arranged from storage tank until engine manifold. Germanischer Lloyd and Project Guide of dual fuel engine will be used as a guidelines to develop an optimal design and arrangement which comply with the regulation

Integration of an Energy Storage in Connection with the Combustion Chamber of a Diesel Engine to Reduce the NOx Emission

This thesis is focusing on how to reduce the NOx emission since it has been an issue in all over the world. An idea that reduced the combustion temperature by integrating an external chamber connected with the combustion chamber as a temporary energy storage. This method is implementing the pressure-temperature law, where the pressure is reduced by expanding the volume that resulted a temperature decreased. The aims of this study were to make a feasibility study of the previous invention, a combustion model simulation and technical drawings design of the external chamber. The simulation model involves an analysis of how the temporary energy stored effected the combustion temperature and calculating the pipeline losses. The results showed that by installing the external chamber, the combustion temperature was reduced significantly by 6.15% for the burn zone and 17.8% for the unburn zone. Furthermore, a comparison of the pipeline heat loss showed that an insulated pipe saved 94.1% more heat energy than the uninsulated. The important factor in designing the external chamber were the spring deflection and piston bore. An analysis shown that the larger the deflection and piston bore, the bigger the pressure drop would be which is why an optimization of those factors were needed