Power Feature Required For Pefc Powered Electric Propulsion Ship

Isao Yoshida Ships s Offshore Structures Planning Dept. NKK Corporation 2-1 Suehiro-cho, Tsurumi-ku, Yokohama 230, Japan

Masaru Oka Ship Designing Dept., Mitsubishi Heavy Industries, Ltd. 1-1 Akunoura-machi, Nagasaki 850-91, Japan

This report covers part of a joint study on a PEFC system for ship propulsion, summarized in a presentation to this Seminar, entitled "Study on a PEFC propulsion System for Surface Ships", and which envisages application to a 1,500 DWT cargo vessel. The aspect treated here concerns an analysis of the load-follow-ing performance required and estimated of a PEFC system to power the envisaged ship.

The analysis proved that difficulty should be expected of the fuel supply circuit in following with adequate rapidity the sharp changes of load on fuel cell under certain conditions. Further integrated experiments and simulation exercises are currently in progress to further analyze the response characteristics of the fuel supply circuit-¬°particularly of the methanol reformer and gas reservoir-to determine the best measure to be adopted for overcoming the expected difficulty.

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