
547Dynamic Simulation and Fuel Cell Control System
12.3.3.1 Geometry
Here, an MCFC system with natural gas partially reformed in an internal
reformer and partially in the anode compartment as shown in Figure 12.21 is
considered (Wolf, 2007). This is a combination of indirect internal reforming
(IIR) and direct internal reforming (DIR), which leads to better thermal man-
agement. In the IIR step, a reforming unit is placed between every 10 cells
in the stack and converts about 50% of the natural gas to hydrogen-rich gas
prior to entering the anode section. The rest of the reforming is left for the
anode, which contains reforming catalysts. In ...