Hybrid drive system for the world’s first LNG hybrid tug
Depending on the operating mode and the required drive power, the hybrid system activates one or both drives (Source: Schottel)
A series of twelve tugs, to be built as replacements for Sembcorp Marine’s existing diesel-powered units, will have Schottel SYDRIVE-E azimuthal hybrid drives capable of operating on LNG or electricity. It is claimed that the vessels are the first LNG hybrid tugs.
Sembcorp Marine is preparing to build the first tug in the series, designed by Bergen-based LMG Marin, a wholly-owned Sembcorp Marine subsidiary. The vessels will be operated in Singapore’s harbours by another of the group’s subsidiaries, Jurong Marine Services. Operations are due to start later this year.
The work profile of the tugs will require highly variable power ranges. Depending on the operating mode and power needed, the hybrid drive deploys the most suitable power source, or both together.
Sembcorp Marine’s hybridised Schottel RudderPropellers type SRP 430 will have a power intake capacity of about 2,000 kW each which will be fed by zero emissions electrical motors and/or low-emissions LNG main engines. The 360° steerable SRPs will have a power intake capacity of about 2MW each, combining maximum flexibility with high bollard pull. The LNG-fuelled main engines and the electrical motors are both coupled to the SYDRIVE and are configured always to operate efficiently within their load ranges. This minimises fuel consumption and emissions.
