固体氧化物燃料电池尾气在多孔介质中的燃烧特性

Combustion Characteristics of Exhaust Gas for Solid Oxide Fuel Cell in Porous Medium Burner

摘要:

通过配置不同组分和温度的混合气体来模拟固体氧化物燃料电池（SOFC）阴极和阳极尾气，并通过搭建双层多孔介质燃烧器实验台来研究SOFC模拟尾气的燃烧特性。结果表明：设计的多孔介质燃烧器可实现SOFC过渡和稳定阶段阳极尾气的稳定燃烧，但启动阶段的阳极尾气容易发生回火，燃烧器内烟气温度随SOFC工作阶段变化不大；阳极尾气中可燃组分的减少和惰性组分的增加都将使火焰面向燃烧器的下游移动并降低稳定燃烧温度，减小入口气流速度会使稳定燃烧温度先升后降，火焰面向燃烧器的上游移动；在无背压工况下，燃烧器的稳定燃烧极限随电堆燃料利用率的增加而减小。

Abstract:

Gas mixtures with different components and temperatures were used to simulate the exhaust gas of anode and cathode for solid oxide fuel cell （SOFC）. And a double-layer porous medium burner was built to investigate the combustion characteristics of the simulated SOFC exhaust gas. The results show that the burner can realize the stable combustion of anode exhaust gas at the transition and stable stage of SOFC. However， the combustion of anode exhaust gas at the initiating stage is prone to backfire and the flue gas temperature in the burner has a little change with the SOFC working stage. The decrease of combustible components and the increase of inert components in anode exhaust gas make the flame move downstream in the burner and reduce the stable combustion temperature. Decreasing the inlet air velocity makes the stable combustion temperature rise first but then drop and the flame move upstream in the burner. Under the condition of no back pressure， the stable combustion limit of the burner decreases with the increase of fuel utilization.