| 摘要 |
An SOFC fuel cell stack system including means for recycling a portion of the SOFC anode tailgas into the inlet of a hydrocarbon reformer supplying reformate to the stack. Recycle means includes a pump. A first heat exchanger ahead of the pump cools the tail gas via heat exchange with incoming cathode air, allowing use of an inexpensive pump. To facilitate endothermic or steam reforming of hydrocarbons, CO 2 , and water in the later portions of the reformer, heat is added back into the tailgas recycle by installing a second heat exchanger or an electric heater downstream of the pump. Air and fuel being supplied to the reformer also are preheated, and reforming air flow may be increased to increase exothermic activity in the early portions of the reformer to permit recycling of large percentages of tailgas such that greater overall reformer efficiencies are achievable. |
