SOFC-GT Hybrid System Evaluation

The fuel cells used in laboratories are typically characterized by weaker performance than the fuel cells used commercially. On the other hand, laboratory test cells are relatively well described and there is an appropriate amount of data needed to find appropriate model coefficients. 

The laboratory fuel cell generates electricity at very low efficiency 18% with a 46% fuel utihzation factor. Those values are very impractical for power generation purposes, and adequate scaling up procedure is proposed to evaluate the hybrid system performances. The system evaluation is started from the SOFC-M as a stand-alone unit. The SOFC only represents a device which generates power by utilization of the SOFC stack only, without any additional devices. Next, a few 

The presented evaluation is based on an SOFC model validated on experimental data. The SOFC model main parameters are listed in Table 5.5. Those factors are needed for determining current density-voltage curves. 

The SOFC has to fulfill the tasks associated with generating electricity. To establish an optimal nominal point, the variables responsible for electricity generating efficiency were selected. The SOFC-M as part of the system is characterized by the following parameters  

The simplest SOFC is to use SOFC-M in stand-alone mode fuelled by hydrogen there is no need (no carbon deposition risk) to use either anode or cathode recycle flows. A diagram of the SOFC-M Stand-Alone unit is shown in Fig. 5.48. 

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