Solid oxide fuel cell device

A solid oxide fuel cell device for generating electricity using reformed fuel gas from a hydrocarbon raw fuel gas, comprising:

• a fuel supply apparatus that supplies raw fuel gas;
• a water supply apparatus that supplies water to steam reform raw fuel gas supplied by the fuel supply apparatus;
• an oxidant gas supply apparatus that supplies oxidant gas for electrical generation;
• a fuel cell stack that produces electrical power by reacting the oxidant gas for electrical generation supplied by the oxidant gas supply apparatus and reformed fuel gas;
• a combustion section placed above the fuel cell stack, that combusts remaining fuel gas not used for electrical generation in the fuel cell stack;
• an inside cylindrical member formed in a substantially cylindrical shape to surround the perimeter of the fuel cell stack;
• an outside cylindrical member formed in a substantially cylindrical shape to surround the perimeter of the inside cylindrical member;
• a fuel gas supply flow path formed in ring shape between the outside wall surface of the inside cylindrical member and the inside wall surface of the outside cylindrical member, to receive heat from the fuel cell stack and the combustion section;
• a fuel gas introducing section, disposed at the lower portion of the fuel gas supply flow path, that introduces raw fuel gas supplied from the fuel supply apparatus into the fuel gas supply flow path;
• a water introducing section, disposed at the lower portion of the fuel gas supply flow path, that introduces water supplied from the water supply apparatus into the fuel gas supply flow path;
• a vaporizing section, disposed above the fuel gas introducing section, that vaporizes water supplied from the water introducing section;
• a reformer disposed within the fuel gas supply flow path above the vaporizing section, to surround the upper portion of the fuel cell stack, that steam reforms raw fuel gas introduced from the fuel gas introducing section using steam produced in the vaporizing section;
• and
• a rotary flow path section, placed inside the fuel gas supply flow path between the vaporizing section and the reformer, that causes raw fuel gas introduced into and rising in the fuel gas supply flow path from the fuel gas introducing section and steam produced in the vaporizing section and rising therein to rotate along the circumferential direction of the fuel gas supply flow path, forming a flow which uniformly supplies mixed raw fuel gas and steam over the entire circumference of the reformer.