直接甲醇燃料电池甲醇传质过程分析及浓度控制策略

Analysis of Methanol Transport and Concentration Controlling Strategy in Direct Methanol Fuel Cell

甲醇溶液浓度对于直接甲醇燃料电池(DMFC)的性能具有重要影响。本文旨在建立一种能在电源系统中有效控制甲醇浓度的策略。通过构建电池内甲醇物料守恒和热守恒方程,确定了基于电量和温度这两个参数的甲醇浓度控制策略。通过测试温度-浓度关系验证了控制策略的可行性。结果表明,采用该策略,DMFC电源系统稳定运行超过420 min;合适的甲醇浓度范围为0.70~0.87 mol/L。该策略完成了甲醇浓度控制的目标,并将在电源系统中发挥重要作用。

The methanol concentration plays an important role in the performance of direct methanol fuel cells(DMFCs).This work aims to establish an effective controlling strategy of methanol concentration for DMFC power system.We combined the methanol conservation equation and the thermal conservation equation to analyze the mass transport process inside DMFC.The concentration strategy was established based on the two parameters,i.e.,charge and temperature.The strategy was effective clarified by the relationship of temperature and concentration.By applying the strategy,the DMFC power system realizes stable operation over 420 min.The appropriate methanol concentration of power system range from 0.70 to 0.87 mol/L.This strategy achieves the goal of methanol concentration control and will play a vital role in the DMFC power systems.