关键词:

固体氧化物燃料电池, 重整反应, 电化学反应, 数值模拟

Abstract:

The overall performance of solid oxide fuel cell (SOFC) is controlled by CH4 steam reforming reactions and CO, H₂ electrochemical reactions, which take place in the porous anode simultaneously and are influenced by various operation and design parameters when pre-reformed methane/steam mixture is used.The composite duct consisted of a porous anode layer,fuel gas flow duct and solid plate.A fully three dimensional numerical simulation program was developed to analyze the coupling mechanism of reforming and electrochemical reaction.Steam reforming was found mostly at the interface and entrance regions within the porous layer close to the fuel flow duct.Electrochemical reaction occurred on the surface between electrolyte and porous layer.CO, H₂ produced by reforming reaction reached the bottom of porous layer and took part in electrochemical reaction. The heat required to keep internal steam reforming reaction was provided by the electrochemical reaction.The SOFC anode composite duct in this paper operated under proper conditions had good heat and mass transfer properties and good coupling relations between reforming and electrochemical reactions.

Key words:

固体氧化物燃料电池, 重整反应, 电化学反应, 数值模拟