Remzi Can Samsun

Fuel Processing of Low-Sulfur Diesel for Fuel Cell Systems

Fuel processing is the umbrella term for a variety of chemical processes aiming at the provision of a hydrogen-rich gas mixture to be fed into the anode of a fuel cell. Among them, the most important ones are desulfurization, reforming, water-gas-shift reaction, preferential oxidation, and catalytic combustion. At Juelich, all these processes are under investigation. This contribution concentrates on autothermal reforming (ATR) of different synthetic and fossil fuels with Juelich’s reactor ATR 13. ATR 13 was developed within the European project Fuel Cell Based Power Generation (FCGEN). Here, special emphasis is on using diesel fuel SD10. SD10 is a conventional low-sulfur diesel, currently used for truck engine testing. ATR 13’s power class of 3–5 kWe is particularly interesting for fuel cell systems with polymer electrolyte fuel cells (PEFCs) working as auxiliary power units (APUs) for onboard power supply in trucks. During autothermal reforming, liquid fuels such as diesel are converted together with air and steam into a hydrogen-rich gas by means of catalysis. The design and construction of ATR 13 was particularly optimized with respect to its power density, since ATR 13 will be assembled in an allocated and limited space at the bottom of a conventional truck. As a result, a high value of 3.6 kW/l was reached. Intensive experimental evaluation of ATR 13’s operational behavior was done and will be reported in this chapter.

Entwicklung und Charakterisierung eines Gesamtsystems

Kapitel 7 beschreibt eine Methodik zur Entwicklung und Charakterisierung eines Brennstoffzellen-Gesamtsystems fur Luftfahrtanwendungen. Um die Entwicklungsschritte besser erlautern zu konnen, wurde ein Beispielsystem aufgebaut. Das System wurde anschliesend umfangreich getestet, um einen besseren Einblick in das Gesamtsystem zu ermoglichen. Die angestrebte elektrische Leistung von 5 kW wurde bei unterschiedlichen Parameterkombinationen demonstriert. Die Ergebnisse stimmten sehr gut mit den Ergebnissen der Prozesssimulation uberein. Es war moglich, einen autarken Systembetrieb ohne externe Warmezufuhr zu realisieren. Dadurch konnte das integrierte Systemkonzept im Rahmen der Gesamtsystemversuche validiert werden. Die experimentellen Ergebnisse mit dem integrierten HT-PEFC-System mit der Reformierung von GTL-Kerosin stellen einen Machbarkeitsnachweis fur diese Technologie dar. Dabei war es moglich, die Kombination der autothermen Reformierung mit der HT-PEFC-Technologie in einem integrierten Gesamtsystem mit 5 kWe Leistung zu realisieren.

Highly integrated catalytic burner with laser-additive manufactured manifolds

This paper describes a highly integrated catalytic burner for auxiliary power units based on PEM-fuel cells. The generated heat is used by an integrated heat-exchanger system. The feasibility is verified by fluid-dynamic calculations. An innovative approach to develop complex reactors for demanding requirements defined by the application is presented.

Fuel cell — Battery hybrid systems for auxiliary power units

This work deals with the development of a fuel cell-battery hybrid system for auxiliary power supply for long-haul sleeper trucks. After the introduction of the special application, the theory of hybridization was briefly explained. A system model was developed to optimize hybrid system architectures for different load profiles. Finally, exemplary results were presented using the developed system model.