Reactant flow arrangement of a power system of several...

H - Electricity – 01 – M

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Details

H01M 8/04 (2006.01) H01M 8/06 (2006.01) H01M 8/14 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2271739

An arrangement is proposed for a system with at least two molten carbonate or solid oxide fuel cell stacks (1, 2, 3). The cathode flows (14) of these stacks are connected in series while the anode flows (25) are in parallel. All stacks have an internal reforming device for a hydrocarbon fuel. Anode gas is recycled (24) from the stack outlets to the inlets. The invention allows the stacks to be of the same design and this reduces manufacturing costs. The cathode streams between the stacks are cooled by, for example, adding streams of cool air (15) to them. The cathode inlet temperatures can, therefore, be controlled by relatively inexpensive low temperature air valves. The invention allows the system to be designed with few heat exchangers, if any. The per pass utilisation of all the oxidant streams and fuel streams are low. The efficiency of the system is typically 4-5 percentage points higher than that of equivalent conventional systems.

L'invention porte sur un agencement destiné à un système présentant au moins deux empilements (1, 2, 3) de piles à carbonates fondus ou à combustible oxyde solide. Les écoulements cathodiques (14) de ces empilements sont reliés en série, tandis que les écoulements anodiques (25) sont placés de façon parallèle. Tous les empilements présentent un dispositif de reformage intérieur, destiné à un combustible hydrocarbure. Le gaz anodique est recyclé (24), des orifices de sortie des empilements aux orifices d'entrée. L'invention permet une conception similaire des empilements, ce qui diminue les coûts de fabrication. On refroidit les courants cathodiques entre les empilements, par exemple en leur ajoutant des courants d'air froid (15). On peut, de ce fait, réguler les températures d'entrée cathodique, à l'aide de vannes basse température, relativement bon marché. Le cas échéant, l'invention permet de doter un tel système de quelques échangeurs de chaleur. L'utilisation par passage de tous les courants oxydants et des courants de combustible est faible. L'efficacité du système est généralement de 4 à 5 points plus élevée, en pourcentage, que celle de systèmes classiques équivalents.

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