SOLID OXIDE FUEL CELL SYSTEM AND METHOD FOR STOPPING SOLID OXIDE FUEL CELL SYSTEM

• Main Author: KIKUCHI YUTO
• Format: Patent
• Language: English; Japanese
• Published: 19.10.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To obtain a highly reliable solid oxide fuel cell system.SOLUTION: A solid oxide fuel cell system includes a reformer 5 that produces reformed gas Ff2, a solid oxide fuel cell stack 2 that outputs DC power through electrochemical reaction between air Fa1 and the reformed gas Ff2, a water vapor generator 9 that generates water vapor Fs2, a recycling circuit 32 that circulates recycling off gas Ff32, and a control unit 4 that coordinated-controls devices in the system. When the system is stopped, the control unit 4 is configured to continue the circulation in a state in which an anode 2a is kept at positive pressure by generating the water vapor Fs2 until the stack temperature T drops to the allowable temperature Tp after the DC power output and the supply of the fuel gas Ff1 are shut off.SELECTED DRAWING: Figure 1 【課題】信頼性の高い固体酸化物形燃料電池システムを得ることを目的とする。【解決手段】改質ガスＦｆ２を生成する改質器５、空気Ｆａ１と改質ガスＦｆ２との電気化学反応によって直流電力を出力する固体酸化物形燃料電池のスタック２、水蒸気Ｆｓ２を発生させる水蒸気発生器９、リサイクル用オフガスＦｆ３２を循環させるリサイクル回路３２、およびシステム内の機器を連携制御する制御部４を備え、制御部４は、システム停止時に、直流電力の出力と燃料ガスＦｆ１の供給を遮断した後、スタック温度Ｔが許容温度Ｔｐに低下するまでの間、水蒸気Ｆｓ２の発生により、アノード２ａを正圧に維持した状態で、循環を継続させるように構成した。【選択図】図１