熔融碳酸盐燃料电池隔膜及单电池寿命

Life of matrix for molten carbonate fuel cell and single cell

采用数学模型推算了熔融碳酸盐燃料电池隔膜寿命,并进行了单电池运行稳定性试验。从电池隔膜阻气能力及离子传输能力两方面,提出以其最大阻气压力差Δp≥0.1MPa,孔隙率满足40%≤η≤70%作为其寿命指标。通过电池最大孔径测试法和隔膜模拟烧结孔隙率测试法,建立数学模型,推算出烧结时间为40000h所对应的隔膜最大孔径为0.9332μm,孔隙率为66.7%,皆小于其寿命指标值,这也说明,隔膜寿命超过40000h。单电池1000h寿命试验结果表明,以H2作燃料,电池性能稳定;以模拟煤气作燃料,电池性能快速衰减,主要由所发生的副反应引起。

The life of matrix for molten carbonate fuel cell (MCFC) was estimated by adopting mathematical model and the operating stability of single cells was tested. The parameters of the maximum pressure difference of gas barries (Δp≥0.1 MPa) and the porosity (40%≤η≤70%) were presented as the life criteria for matrix from the pointofview of gasbarrier capability and iontransfer capability. The maximum pore size and the porosity of the matrix with the sintering time of 40 000 h are estimated to be 0.933 2 μm and 66.7% respectively by the various testing methods. That means the matrix life is more than 40 000h. The result of 1 000 h life test for single cell show that the MCFC using H2 as fuel has stable performance where as the performance of the MCFC using simulated coal gas as fuel is deteriorated badly due to the side reactions.