HIGH-PERFORMANCE HEAT EXCHANGERS FOR FUEL CELL APPLICATIONS
After more than three years, the research project MultiSchIBZ under the lead of OWI Science for Fuels gGmbH was successfully completed. The aim of the project was to reform diesel into a fuel gas for solid oxide fuel cells (SOFC) and the coupling with an energy storage system for the operation of networks in the low MW range on ships. Particular challenges are the high gas temperatures of up to 900°C, the limited installation space, a good maintenance concept and the very high safety requirements for ship operation. These high demands for heat exchangers cannot be met with conventional designs. Tube recuperators are too large and plate recuperators do not meet the high safety requirements.
The use of Metal additive manufacturing via laser powder bed fusion and the qualification of the high-temperature resistant steel AISI 309 has enabled Rosswag Engineering to deliver innovative solutions for these challenges. Tube bundle and plate recuperators were designed and manufactured in collaboration with the Institute of Thermodynamics at the University of Hanover and Hülsenbusch Apparatebau GmbH. According to simulations and initial tests, the heat transfer rate could be increased by more than 70 % while the needed built volume is just 5 % comparing to conventional tube bundle heat exchangers. The new heat exchangers also meet the high safety requirements for use on ships.
The beneficial use of newly qualified materials for fuel cell and heat exchanger applications are just some of many new possibilities to be realized by Rosswag's holistic process chain and the broad variety of meanwhile more than 40 in-house qualified materials.