| abstract |
(57) [Abstract] [Problem] Reformed fuel such as natural gas or methanol, A carbon monoxide removal technique capable of reducing carbon monoxide in a hydrogen-rich reformed gas to, for example, 10 ppm or less with a compact system without unnecessary loss of hydrogen is obtained. SOLUTION: A metal catalyst for methanizing or oxidizing carbon monoxide is provided inside, and a CO remover for removing carbon monoxide in the reformed gas by contact with the reformed gas is provided in two stages. Most of the carbon monoxide is removed by methanation in the first CO remover 6 of the stage, and the remaining carbon monoxide is mainly removed by oxidation in the second CO remover 7 of the second stage. |