甲烷/甲醇固体氧化物燃料电池输出电特性与内部多物理场分布模拟研究

To reveal the interplay of various internal multi-physics fields within solid oxidc fucl cells (SOFCs) fueled by different types of fuels, a multi-field coupled three-dimensional planar SOFC single-cell model is established and validatcd. A comparativc analysis is conductcd to cxplorc the variations in steady-state Performance of SOFCs fueled by hydrogen, methane, and methanol. The distribution characteristics of temperaturc fields, concentration fields inside the cell, and the carbon deposition characteristics of hydrocarbon fuels in the cell arc obtained. The results show that the pre-reforming of methane fuel can effectivcly improve the cell's discharge capacity, with a 20% increase in pre-reforming degree leading to an 8% increase in the cell' s maximum Output power. In comparison to methane, the impact of pre-reforming methanol fuel on the cell's Output power is relatively small. The usc of methane fuel can mitigate the risk of cell damagc due to excessive temperature gradients, with the maximum temperature gradient at the anodc-gas flow channel interface reduced to 10 K/cm, as opposcd to 22 K/cm when using hydrogcn as fucl. This paper also unveils the distribution characteristics of carbon deposition rates insidc thc cell at different voltages. Lowcring the operating voltage increases the carbon deposition rate inside the cell, with the carbon deposition rate for methane fuel at [7: 0. 5 V being more than double that at [7: 0. 9 V. Sclecting methanol as the fuel for SOFCs poses a lower risk of internal carbon deposition compared to methane as the fuel.