电化学反应对甲烷直接内重整效能的耦合作用分析

本文以直接内部重整型固体氧化物燃料电池为对象,主要抓住研究对象的稳态特性,以尾气组分验证模型的正确性,着重分析电化学反应对甲烷直接内重整效能的耦合影响。结果发现,甲烷平衡转化率受甲烷流量、水碳比、压力变化的影响不是很大,仅对温度变化比较敏感;而氢气平衡转化率在不同甲烷流量、水碳比、压力及温度下的差别比较大;在电池放电电流增大的过程中,甲烷平衡转化率与氢气平衡生成率均有所提高,后者更为明显。电化学反应对甲烷直接内重整效能有很大的影响。

Coupling Effects Analysis of Electrochemical Reaction on the Direct Internal Reforming Efficiency of Methane

Taking the direct internal reforming solid oxide fuel cell as object and mainly grasping its steady-state characteristics, this paper verifies the correctness of the model by the constituents of exhaust and finally focuses on the coupling effects analysis of electrochemical reaction on the direct int ernal reforming efficiency of methane. After simulation, the result shows that CH4 convert ratio is rarely affected by CH4 flow rate, water carbon ratio or pressure changes, but sensitive to temperature variety. But H2 generating yield varies greatly under different CH4 flow rate, water carbon ratio, pressure and temperature. However, in the process of increasing cell discharge current, CH4 convert ratio and H2 generating yield are improved, and the latter’s increase is more obvious. So the coupling of elec trochemical reaction has a great influence on the direct internal reforming efficiency of methane.