SOLID-OXIDE FUEL CELL SYSTEM, AND METHOD FOR STARTING SAME

摘要

During system start-up in S11, an ATR process begins, and the hydrogen-enriched fuel gas is generated by the autothermal reaction. In S12, a cell temperature T is compared to a minimum reduction start temperature T1 of the cell support and, in the case of T≧T1, the process proceeds to S13. In S13 a hydrogen concentration of the fuel gas is set to 50% or less. In S14, the cell temperature T is compared to a maximum reduction start temperature T2 of the cell support, and in the case of T>T2, the process proceeds to step S15. In S15, the temperatures of the reformer and the fuel cell stack are continuously raised, while gradually increasing the hydrogen concentration.

主权项

1. A method for starting a solid oxide fuel cell system configured to include: a reformer that generates a hydrogen-enriched fuel gas by a reforming reaction; a fuel cell stack that allows the fuel gas from the reformer to react with air to generate power; and a module case that surrounds the reformer and the fuel cell stack, in the inside of which excessive fuel gas of the fuel cell stack is combusted to maintain the reformer and the fuel cell stack in a high temperature state, in which each cell forming the fuel cell stack is made of a porous material having a composition including at least a nickel metal, includes a cell support having a gas passage through which the fuel gas from the reformer flows from one end to the other end on the inside thereof, and is formed by stacking a fuel electrode layer, a solid oxide electrolytic layer, and an air electrode layer on the cell support, and the excessive fuel gas is combusted at the other end of the gas passage, comprising the step of:
controlling a hydrogen concentration of the fuel gas from the reformer to be 50% or less when a temperature of the cell support is within a reduction start temperature range during system start up.