Computer Analysis of Fuel Cell Power Systems Performance for Naval Applications

摘要

This report demonstrates the use of computer programs to model and analyze fuel cell power systems for ship applications which utilize hydrocarbon fuels. Programs available include those for Molten Carbonate (MCFC), Phosphoric Acid (PAFO), and Polymer Exchange Membrane (PEM). The PEM system was chosen as an illustrative example because the program for the PEM model is the most comprehensive of the available programs. It has been recently employed extensively in a ship impact study conducted by the Carderock Division, Naval Surface Warfare Center (CDNSWC). The development of a 2500kW PEM fuel cell power system is described in detail beginning with functional input requirements and ending with a complete physical model. The model includes the size and weight of all major power plant components required to produce direct current electric power with diesel fuel. The fuel cell system weights and volumes are compared to state of the art gas turbine and diesel engine generators. Fuel utilization curves are generated and compared with typical equivalent engine generator systems. The output of each phase of development is exhibited as the program is run. For example: the system architecture, material balances, energy balances, detailed heat exchanger utilization and design data, acquisition and life cycle cost estimates, component weights and volumes, and off design performance (fuel rate versus per cent rated load data). A three dimensional computer model of the system is drawn from the generated data showing the major components in relative positions using AutoCac. This model can be utilized in other AutoCac compatible programs to demonstrate the spatial arrangement of components within the ship and to estimate centers of gravity and moments.