Patent ID: 8062799

Claim:
A dual stack fuel cell system comprising: a first fuel cell stack comprising a first anode side, adapted to receive fuel and to output a first anode exhaust, and a first cathode side; a second fuel cell stack comprising a second anode side, adapted to receive processed anode exhaust derived from said first anode exhaust and to output a second anode exhaust, and a second cathode side, adapted to receive oxidant gas and to output a first cathode exhaust; wherein said first cathode side receives at least said cathode exhaust outputted from said second cathode side; and wherein said first fuel cell stack includes a first indirect internal reformer and said second fuel cell stack includes a second indirect internal reformer, said fuel cell system further comprising a reformer bypass line for bypassing a portion or all of said processed anode exhaust around said second indirect internal reformer to an anode compartment of said second anode side.