The Wallenius Marine intends to install a waste recovery system on one of its new or existing ships by 2011. The initial installation which aims to utilize waste heat for production of electricity onboard is expected to achieve a fuel saving of between 4 – 6%. It is the first time an Opcon Powerbox, an Organic Rankine Cycle (ORC) waste recovery system, will be installed on a ship .
The Opcon Powerbox is used by a heat exchanger to vaporize a working fluid with a boiling point lower than water (thereby enabling the exploitation of low grade waste heat). The gas expands over an expander, which drives a generator to produce electricity. The fluid is then cooled, and a pump increases its pressure to 30 bar, and circulates it back through the first heat exanger.
‘ We expect major environmental gains from this’ , said Per Croner, CEO of Wallenius Marine AB. ‘ Our vessels consume about 200,000- 250,000 tons of bunker fuel a year. A fuel saving of between four and six per cent means we cut emissions of carbon dioxide with about 37,000 tons a year and sulphur dioxide with some 150 tons a year.’
Wallenius will pay for the installation costs and pay for supplied electricity during the test period. It has responsibility for crewing, operation, technical and environmental development of the Wallenius fleet. Through subsidairies and togheter with partners, Wallenius controls more than 150 vessels.