Solid oxide fuel cell which operates with an excess of fuel

H - Electricity – 01 – M

Patent

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Details

H01M 8/12 (2006.01) H01M 8/06 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2343740

The invention relates to a method for operating a fuel cell, comprising the following steps: a hydrocarbon-containing fuel is fed into the inside of the fuel cell with a large excess; the hydrocarbon-containing fuel is converted into a synthesis gas internally and directly in or on the anode by means of an endothermic reaction; and the synthesis gas is only partially converted into electricity in the fuel cell by means of an exothermic electrochemical reaction. The aim is to achieve an almost isothermic stack-operating temperature. It is also possible to limit the oxygen requirements of the electrochemical reactions to an almost stoichiometric dosage. In addition to electricity, more valuable gases (hydrogen) are produced.

L'invention concerne un procédé permettant de faire fonctionner une cellule électrochimique, selon lequel un combustible contenant un hydrocarbure est introduit de façon excédantaire dans la cellule électrochimique; le combustible contenant un hydrocarbure est transformé dans la cellule en gaz de synthèse et directement dans ou sur l'anode par une réaction endothermique; le gaz de synthèse est transformé en partie uniquement en courant dans la cellule électrochimique par une réaction électrochimique exothermique. La chaleur dégagée par les réactions exothermiques est avantageusement utilisée en totalité par les réactions endothermiques. On s'efforce d'atteindre une température de service de la pile quasiment isothermique. En outre, il est possible de limiter le besoin en oxygène nécessaire aux réactions électrochimiques à un apport quasiment stoechiométrique. On obtient ainsi la production non seulement du courant mais aussi d'une plus grande quantité de gaz de valeur (hydrogène).

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