Abstract
While a fuel cell (30) operates, a fuel cell system (10) allows a carbon dioxide rich gas discharged from an anode (34) of the fuel cell (30) through consumption of hydrogen to be fed into a carbon dioxide recovery element (43) of a carbon dioxide recovery unit (40). The carbon dioxide recovery element (43) is packed with a zeolite, which absorbs and retains a polar substance CO2. When the fuel cell (30) stops operation, a recovery element heating burner (44) receives a supply of the hydrogen-containing carbon dioxide rich gas fed via a first exhaust conduit (38) of the fuel cell (30) and a supply of methanol from a methanol reservoir (12), and combusts hydrogen contained in the carbon dioxide rich gas as well as the supply of methanol. This keeps the zeolite packed in the carbon dioxide recovery element (43) under a heating condition, which allows carbon dioxide previously absorbed and retained to be released from the zeolite. A reforming reaction unit (22) of a methanol reformer (20) and the fuel cell (30) are filled with the released carbon dioxide fed therein.
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