Performance Analysis of Ejector-Based Solid Oxide Fuel Cell Anode Gas Circulation System

The anode exhaust of the cell is rich in water vapor and a small amount of hydrogen. Recovering the SOFC anode exhaust through the ejector can effectively prevent carbon deposition and improve energy utilization. In this paper, biomass gas with different components is selected as fuel, and the performance of different fuels under the condition of fixed steam to carbon ratio is compared and analyzed. The results show that when the lower heating value of the control inlet fuel is the same, the high-calorific value and low-density fuel can bring higher electrical energy output and the highest power generation efficiency can reach 51.3%, but the corresponding circulating ejector size is also larger; Under off-design conditions, when the primary gas supply pressure is 13bar, the highest generating power of the reactor can reach 419.8KW. However, high pressure will lead to a decrease in the water carbon ratio at the anode entrance. There is a trade-off between carbon deposition and stack performance output.