Patent ID: 8257668

Claim:
A hydrogen generator comprising: a combustion gas passage configured to flow combustion gas which has been generated in a combustor; a preheat-evaporator which is supplied with a material gas and water and configured to evaporate the water and heat the material gas by heat transmitted from the combustion gas passage and a carbon monoxide reducer through a partition wall; a reformer which has a reforming catalyst and is configured to generate a hydrogen-containing reformed gas through a steam reforming reaction between the material gas and steam fed from the preheat-evaporator, by using the reforming catalyst and the heat transmitted from the combustion gas passage through the partition wall; the carbon monoxide reducer which has a carbon monoxide removing catalyst and is configured to remove carbon monoxide from the reformed gas fed from the reformer by an action of the carbon monoxide removing catalyst; and a cylindrical body closed at both ends thereof, having an internal space which is divided by the partition wall to form the combustion gas passage, the preheat-evaporator, the reformer and the carbon monoxide reducer within the cylindrical body; wherein a heat transmission buffering section is provided between the preheat-evaporator and the carbon monoxide reducer, the heat transmission buffering section being formed by a space between the partition wall that defines the preheat-evaporator and the partition wall that defines the carbon monoxide reducer, the partition walls being opposed to each other; and at least one end of the heat transmission buffering section is closed when viewed from a flow direction of the reformed gas.