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Barillec marine to equip LNG hybrid dredger

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LNG Industry,

The Socarenam shipyard has entrusted Barillec Marine with the production of the LNG/Diesel-electric propulsion system and the water injection dredging system of the new dredger ordered by the economic interest grouping Dragages Ports and Bordeaux port Atlantique. This innovative system will make the port of Bordeaux dredger, the first new dual-fuel construction in France (excluding LNG tankers).

France's first hybrid dual-fuel ship

For Barillec marine, this contract is above all a recognition of its expertise in the design and supply of innovative applications, complete energy production systems, electric propulsion systems and hybrid systems for all types of ships. This contract, which represents close to 7000 hours of work, involves the design and supply of the main panel for hybrid energy production, of the main and auxiliary dual-fuel/electric propulsion and an innovative energy conversion system.

The two main propulsion assemblies will each include an electric motor with nominal power of 1200 kW at 1600 rpm. The Bow thruster auxiliary propulsion system will comprise an electric motor with nominal power of 400 kW at 1500 rpm. The two dredging pumps will each have power of 500 kW. The innovative conversion system will convert the upstream 690 V/60 Hz energy to the downstream 400 V/50 Hz network and will be equipped with two 150 kVA decoupling transformers.

Energy efficiency and environmental protection

This hybrid dual-fuel system combined with the complete Barillec marine offer is particularly energy efficient. The frequency converters help optimise the operating parameters of the main machines, azimuth thrusters and bow thruster. Efficiency is bolstered by variable speed and a dynamic ship positioning system. In addition, a Power Management System (PMS) helps organise the operation of machines and further improves the ship’s energy performance.

The innovative system will enable the new dredger to be propelled mainly by LNG and secondarily by light marine diesel. The use of natural gas as a fuel reduces CO2 emissions by almost 25% and nitrogen oxide NOx emissions by close to 80%, and eliminates almost all sulfur dioxide and fine particulate emissions. The use of this fuel and of water injection dredging will make the Ostréa–the future name of the dredger–an eco-efficient ship with a lower environmental footprint.

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