抄録
For practical use of the Solid Oxide Fuel Cell (SOFC) cogeneration system, we suggested the direct heating method of SOFC module which could balance the cell performance and the soundness of the cell. From heat flux motion analysis of the equivalence ratio distribution on the burner, the best possible burner for direct heating was assumed to be the surface combustion burner which had many cluster nozzles in order to prevent the back fire and a rectification plate in an air header. The distribution of equivalent ratio φ at the non-combustion of the surface combustion anode burner was 1.09 ≦ φ ≦ 1.25. The residual oxygen concentration in combustion gases was less than 100 ppm, and the soot did not occur. The mean open circuit voltage of the bundle of the 10kW class SOFC module was 5.45V within ±0.7% precision, when the mean central temperature of the bundle was 665.5°C. The difference of the cell temperatures in the axial direction was controlled at less than 66°C and the difference between the temperatures inside and outside of the cells was controlled at less than 4°C. As a result a cell was able to reduce thermal stress and to maintain soundness. We demonstrated the validity of the direct heating method of SOFC module with the combustion gases of the burner.
