Hydrogen Tug

By Keith Henderson at July 18, 2010 05:41
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At the recent International Tug & Salvage Conference in Vancouver details of a new hybrid tug was presented with the triple propulsion modes of diesel electric, battery and fuel cell claiming to give a 67 per cent emission savings over conventional diesel operation. Aim of this particular Hybrid Electric Tug design is to provide an operating mode of zero emissions for the majority of the tug's duty profile during low power operation up to 35 per cent of full power: this includes transits at a cruising speed of about nine knots. Based on a current conventional 24-m hull design developed by Capilano Maritime Design Ltd. with 55-tonne bollard pull, a more powerful 70-tonnes bollard pull version would only require minor changes to the hull and propulsion drives with an increase in battery capacity with diesel generator and fuel cell systems remaining unchanged. Four fuel cells of the PEM type are specified giving a total continuous power output of 600kWe, representing 17 per cent of power. There is a 1,000 kW-h capacity Li-Ion battery system which allows a combined power output of 1,250 kWe. A storage capacity of 1,200 kg of hydrogen provides an endurance of about 40 hours at full power, sufficient to allow refueling intervals of about once per week.
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