Modelling of finger-like channelled anode support for SOFCs application  

作　　者：Bin Chen Haoran Xu Meng Ni 

机构地区：[1]Building Energy Research Group,Department of Building and Real Estate,The Hong Kong Polytechnic University

出　　处：《Science Bulletin》2016年第17期1324-1332,共9页科学通报（英文版）

基　　金：supported by a Grant(PolyU 152127/14E) from Research Grant Council,University Grants Committee,Hong Kong SAR

摘　　要：This paper established a numerical model for a solid oxide fuel cell （SOFC） button cell, focusing on the effects of finger-like channels on the gas transport process in the anode support. The current densities of channelled button cell and un-channelled button cell are compared at different operating temperature and voltage with H2 as the fuel. The H2 transport is discussed in detail, such as the mole fraction distribution of H2 in the porous layer, the diffusion flux and convective flux of Ha. It is found that the performance of SOFC can be improved by 2.60 % at 800 ~C, 0.5 V, com- pared with un-channelled SOFC due to the improved gas transport by the finger-like channels. Then, the model is further extended to study 2D-planar SOFC fuelled with syngas. The mole fraction gradients of H2, CO, CH4 and CO are all substantially reduced by the finger-like channels compared to un-channelled planar cell. It is found that the SOFC performance is improved by 5.93 % at 800℃, 0.5 V, when syngas fuel is used. The present study clearly demonstrated that the use of finger-like channels in the anode support is effective in improving the gas transport and the SOFC performance. The present model can be employed for subsequent optimization of the channel configuration for further performance improvement.This paper established a numerical model for a solid oxide fuel cell(SOFC) button cell,focusing on the effects of finger-like channels on the gas transport process in the anode support.The current densities of channelled button cell and un-channelled button cell are compared at different operating temperature and voltage with H_2 as the fuel.The H_2 transport is discussed in detail,such as the mole fraction distribution of H_2 in the porous layer,the diffusion flux and convective flux of H_2.It is found that the performance of SOFC can be improved by 2.60%at 800℃,0.5 V,compared with un-channelled SOFC due to the improved gas transport by the finger-like channels.Then,the model is further extended to study 2D-planar SOFC fuelled with syngas.The mole fraction gradients of Hv2,CO,CH_4 and CO are all substantially reduced by the finger-like channels compared to un-channelled planar cell.It is found that the SOFC performance is improved by 5.93%at 800 ℃,0.5 V,when syngas fuel is used.The present study clearly demonstrated that the use of finger-like channels in the anode support is effective in improving the gas transport and the SOFC performance.The present model can be employed for subsequent optimization of the channel configuration for further performance improvement.

关 键 词：Phase inversion CFD modelling Finger-like channels Concentration loss 

分 类 号：TM911.4[电气工程—电力电子与电力传动]