| 초록 |
Anode-supported micro-tubular SOFC (solid oxide fuel cell) systems have superior characteristics to planar SOFC in view of thermal and mechanical properties. Therefore, in order to reduce start-up time for APU (auxiliary power unit) application, we should develop a micro-tubular type SOFC system. However, there are many problems in process and stack design of a micro-tubular type SOFC system. In the present work, we developed a 1kW-class anode-supported micro-tubular SOFC(solid oxide fuel cell) stack for APU (auxiliary power unit) application. For this purpose, we have first designed a single cell by optimization of current collecting method, brazing method and the length of tubular cell, and then we have fabricated a high power single cell showing cell performance of 0.56 W/cm2 at 0.7V and 800oC. After that we designed manifold by adopting simulation method to uniformly supply fuel gas and oxygen gas to the inside and the outside of each unit cell, respectively. Finally, we can construct a 1kW-class anode-supported micro-tubular SOFC stack by stacking the 20 bundles of cells. The SOFC stack shows a maximum power about 1.1kW at 780oC using H2 and air as fuel gas and oxidant gas, respectively. Moreover, it should be noted that at present the start-up time for the SOFC operation was 2 hours, and it will be reduced less than 1 hour by controlling thermo-mechanical properties of the SOFC. |
