Turbine-powered containership study

The PERFECt concept vessel is LNG-fuelled and is powered by a combined gas and steam turbine The PERFECt concept vessel is LNG-fuelled and is powered by a combined gas and steam turbine

GTT, CMA CGM and DNV GL have released a technical and feasibility study for a new mega box ship – the Piston Engine Room Free Efficient Containership (PERFECt).

The concept vessel is LNG-fuelled, powered by a combined gas and steam turbine, and is electrically driven, which the partners say is a propulsion concept that has the potential to offer a more efficient box ship design than current 20,000 teu two-stroke diesel engine driven ultra large container vessels.

Gerd Würsig, business director for LNG-fuelled ships at DNV GL – Maritime, said: “A modern, land-based combined cycle LNG-fuelled power plant will reach fuel-to-power efficiency ratios of up to 60%, which is higher than conventional diesel engines, which can achieve up to 52%. In addition, the power density by volume and weight is much higher for a COGAS system.”

In a comprehensive analysis with the DNV GL COSSMOS tool, components of the potential power production and propulsion system were simulated in order to analyse the COGAS system to gather detailed data for the calculation of the overall fuel efficiency for a complete round voyage.

The partners said that the lower footprint of the machinery system and increased flexibility of the electric propulsion system means that the capacity of the vessel can be increased generating greater revenues and reducing the payback time for the additional CAPEX required.

Because the two 10,960 m³ LNG fuel tanks are located below the deck house, the space normally occupied by the conventional engine room can be used to increase cargo capacity significantly.

The next phase of the study aims to optimise the propulsion system and ship design to attain even greater efficiency and increased cargo capacity.

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