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CLUTCHES, BRAKES & COUPLINGS FEATURE


Coupling system helps drive the trend towards eco-friendly ships


W


hile electric and hybrid drives are becoming a readily accepted method of propulsion for a wide range of vehicle types, the shipping


industry still relies heavily on conventional fuels and generates a significant amount of carbon dioxide. However, the introduction of Germany’s first electrically driven excursion vessel – which first started to transport passengers on Baldeney Lake in Essen in 2017 – could help to point the way for the development of cleaner power sources for larger ships. At the heart of this quiet and eco-friendly craft, and transmitting the power from a total of three drive types, is a specially developed coupling unit.


COUPLING SYSTEM DESIGN The coupling system for the drive was designed and manufactured by Reich-Kupplungen and consists of a Multi Mont Sella 100 claw coupling with an Arcusaflex 5.1 flange coupling and two electromagnetic clutches. The challenges faced by Reich’s engineers included delivering a switchable propulsion drive system which would allow the automated use of the three drive types: purely electric drive, pure diesel drive, or combined diesel-electric drive. To reduce vibrations from the engine, the


motor and the drive components, flexible and highly flexible couplings are combined with the electromagnetic clutches and


Germany’s first electrically driven excursion vessel transports passengers across Baldeney Lake in Essen


integrated into a single housing to form a compact unit.


USING RENEWABLE ENERGY SOURCES The energy required for operating the craft is generated entirely from renewable energy sources. The ethanol energy source is produced by the hydro-electric power station located at Baldeney Lake dam. Carbon dioxide for the production of the electro-bio-catalytic methanol is filtered from ambient air by means of a container. Using hydro-electric power, the enzymes are stimulated to convert water and carbon dioxide into methanol. Methanol is also sourced, in an eco-friendly manner, from Iceland. The combined total of 330 litres of methanol, sufficient to supply enough energy for 16 hours, is then used to generate electricity in the 35-kilowatt fuel cell of the vessel to power the craft’s electrical system and the battery-powered motor. Two batteries, with a capacity of 50-kilowatt hours each, last for four hours in total. At the end of this period they need to be recharged,


either by the fuel cell or by using an onshore charging cable. Reich Drive Systems UK


www.reich-uk.com


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DESIGN SOLUTIONS | OCTOBER 2018


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