Run Time (mln)

Figure 6. Transient Temperature Profiles

The next step in evolution of the gasoline fuel processor was the development of an autonomous control system. The control system was developed by first constructing a fully dynamic model of the fuel processor including kinetic effects in the catalyst beds. Once the model was developed, simple single-loop controllers were designed and tested against the model. Output from the control system tests show that during a 1:4 step turn-up in reformer power, gas temperatures through the shift beds are expected to increase 120 °C with a corresponding increase in CO concentration at the reactor exit increase from .4 to 1.2%. However, the experimental results show that the gas phase temperature is less important than the catalyst bed temperature in determining CO conversion. Finally, the control system modeling shows that the reformer responds at a slew rate in excess of 100 kW/sec. The actual control system software is now complete and is being

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