Carbon monoxide selection of the catalyst Reduces the carbon monoxide generated due to the dopant reaction proceeding in a temperature range where the oxidative activity is sufficient to provide a hydrogen rich gas having a very low carbon monoxide concentration, thereby providing a fuel reforming device for the fuel cell system 10. 30 is provided with the gas flow rate sensor 37 in the reformed gas supply path 36 which connects the reforming part 32 and the CO selective oxidation part 34. As shown in FIG. The control part 70 outputs a drive signal to three valves with which the CO selection oxidation part 34 was equipped based on the detection signal from the gas flow sensor 37. The CO selective oxidation unit 34 has three reaction chambers filled with a carbon monoxide selective oxidation catalyst, and the reformed gas supplied to the CO selective oxidation unit 34 passes by switching the opening and closing states of the three valves. Increase or decrease the number of threads. Accordingly, the amount of carbon monoxide selective oxidation catalyst can be increased or decreased in accordance with the amount of reforming gas supplied to the CO selective oxidation section 34.
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