膜燃烧残留物对MCFCs再启动性能的影响

Influence of flaming residues in the membrane on the restart-up performance of MCFCs

聚乙烯醇缩丁醛(PVB)膜在非正常燃烧条件下,膜中残留碳为5.0%左右,影响了熔融碳酸盐燃料电池(MCFC)再启动性能。在PVB膜电池自然再启动中,膜粉料发生有限水合作用,生成的水合物(LiAlO2.nH2O)可以部分去除膜中的残留碳,提高了电池性能。在聚乙烯醇(PVA)膜制备中,膜粉料发生水合作用,生成的水合物有助于有机物燃烧,有效去除膜中残留碳,提高了电池性能。高温失水导致膜电导率产生变化,致使电池再启动性能出现下降———回升———稳定的走势,不同于PVB膜电池。长时间开路等可使PVA膜电池再启动性能快速回升,超过初始值,并进入稳定状态。

The restart-up performance of tbe cell was influenced by 5.0% carbon residue after the incomplete burning of PVB membrane and the restart-up performance of the cell could be improved by hydrated particles partially removing the carbon residue during restarting naturally. For the PVA membrane, the restart-up performance of the cell could be improved effectively by removing the carbon residue on the hvdrated LiAlO2·nH2O particles happening in the preparation of the membrane. During thermal circles, the restart-up performance of the cell showed a slightly decreasing—rising—stabilizing process, which was different from that of the cell assembled with the PVB membrane, that might be due to the conductivity variation of PVA membrane resulting from the losing hydrated water at high temperatures. The restart-up performance of the cell could be improved to an even level, higher than the initial performance and stabilized effectively by keeping the open circuit state for a long time during thermal circles.