Pages 50-57: Hybrid Propulsion System

Regional and global air pollution from marine transportation is a growing concern. In descending the sources of such pollution, researchers have now become more interested in tracking where along the total fuel life cycle, these emissions occur. Mechanical power and electric power work together in the propulsion train optimizing the propulsion efficiency for ships with a flexible power demand. The combination of mechanical power by dual fuel engine and electrical power by electrical motors through hydrogen fuel cells delivers propulsion power, providing the right amount of power and torque to the propeller in each operation mode. Dual fuel engine- The dual fuel engine is an excellent solution for fulfilling IMO TIER 3 NOX as well as the increasingly stringent Sulphur fuel caps. The dual fuel engine uses both gas-oil mixture and natural gas as fuel. That adds to the security of energy supply. The thermal efficiency of dual fuel engine is 36%, so that the availability of gas at a price 10% less than that of fuel oil make it worthy for consideration. Hydrogen fuel cells-a fuel cell is a device that converts chemical potential energy (energy stored in molecular bonds) into electrical energy. A PEM (proton exchange membrane) cell uses hydrogen gas and oxygen gas as fuel. The product of the reaction in the cell are water, electricity and heat. Our Hybrid propulsion systems include a dual fuel engine, hydrogen fuel cell and electric motor ,typically allowing the diesel , gasoline or LPG engine to do the heavy work when needed , and allow the electric system to respond to lighter loads such as low-speed cruising or providing power for lights and electronics. Using these two in connected manner we get one of the most efficient propulsion systems.