200W MCFC电池组的电化学性能及热平衡计算

The Performance and Heat Balance of the MCFC Stack with the Power of 200 W

MCFC电池组 (6对电池 ,电极面积 2 2 6cm2 )在 0 .9MPa/cm2 反应气压下 ,输出功率为2 17.6W .热平衡计算表明 ,该电池组在 30 0mA/cm2 电流密度下放电 ,当气体利用率为 2 0 %时 ,电池组处于热平衡状态下运行 .若维持此热平衡 (电池组内最高温度为 70 0℃ ,运行温度 6 5 0℃ )状态且提高反应气体利用率 ,则电池组热平衡点的电流密度将下降 ,以空气 +CO2 为氧化剂 ,H2 +CO2 为燃料气时 ,在不同气体利用率下电池组热平衡点的电流密度均大于 10 0mA/cm2 .提高电池组的输出功率 ,热电效率将下降 ;提高反应气压 。

The output power of the MCFC stack was 217.6 W under reaction gas pressure,0.9 MPa/cm 2 and utilization of oxidant and fuel gas,20%.By calculation it was demonstrated that the heat balance state in the stack was kept at 300 mA/cm 2 under the utilization of fuel gas and oxidant,20%.The current density in heat balance state was higher than 100 mA/cm 2 under the utilization of air+CO 2 mixture gas as oxidant and H 2+CO 2 mixture gas as fuel gas,40% and 60% respectively.If the utilization was increased in the stack,the current density in heat balance state would be lowered.If the output power of the stack was increased,the thermal_electrical efficiency would be decreased and if reaction gas pressure was increased,the thermal_electrical efficiency would be increased.