【摘要】 为达到准确预测电化学去极化CO2浓缩器(EDC)操作条件内性能的目的,进行了电化学CO2浓缩过程分析.在EDC中许多物理、化学和电化学过程同时相互作用,这些过程可以用实验方法进行数学定义和表征,从而用计算机计算出结果来预测EDC性能随所研究的操作参数的变化,假定该浓缩器沿空气流的方向分割成几个子电池,并且每个子电池中的质量传递必须是垂直于电极方向的,此时采用不同的控制传递或反应的机理将子电池分割成五个区进行表征,进而分别讨论每个区中的控制机理.为支持数学分析,实验研究了电池对于空气入口CO2分压、电流密度、H2出口CO2质量分数变化的瞬时响应.该电化学CO2浓缩过程分析能较好地解释实验结果,并证明了推断的反应机理.更多还原

【Abstract】 Electrochemical CO₂ concentrating process were analyzed for accurately predicting the performance over operating electrochemical depolarized CO₂ concentrator （EDC）. In an EDC, numerous physical, chemical and electrochemical processes interact simultaneously. These processes were experimentally defined and characterized mathematically for computering solution to predict EDC performance as function of the operating parameters involved. The concentrator was divided into several subcells in the direction of air flow, and for each subcell mass transfer was considered only in the direction perpendicular to the electrodes. Thus a subcell was divided into five zones characterized by different dominating transport or reaction mechanisms, and the dominating mechanisms in each zone were discussed separately. Experiments for supporting the mathematical analysis were carried out to study the transient response of a cell to changes of process air inlet p_CO2, current density and CO₂ concentration at H₂ out. The process analysis agreed well with the experimental results, thus confirmed the proposed reaction mechanisms.更多还原