Alternative LNG propulsion systems

摘要

Until today steam-turbines have been used as standard propulsion plants for LNG-carriers. In these applications »Boil-Off-Gas« (BOG), generated in various quantities depending on the chosen tank isolation, is burnt in steam-generators (marine boilers) via dual-fuel burners (oil or/and gas)« explains Dipl.-Ing. Stefan Jurga, Senior Project Manager, SAACKE Marine Systems. The result is superheated steam that is directed into the steam-turbine. If the produced amount of gas is bigger than the one needed for powering the propulsion, the whole BOG may, nevertheless, be fed into the boiler. Ensuing surplus steam is released into a condenser and re-cooled. Subsequent condensate is afterwards again placed at the boiler's disposal.