| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently remove an impure gas which stays in a hydrogen electrode space while a system is left standing, before the power generation of a fuel cell system is started. <P>SOLUTION: A hydrogen tank 3 is connected to the hydrogen electrode 2A of the fuel cell 2 via a hydrogen supply passage 4, and a hydrogen shut-off valve 6 is provided in this hydrogen supply passage 4. A hydrogen-circulating passage 4A is provided in the hydrogen supply passage 4, and an unused hydrogen, which does not contribute to the generation of the fuel cell 2, is circulated to the fuel cell 2 and is recycled. A pressure sensor 9 for detecting the pressure of the hydrogen, flowing from the hydrogen tank 3 to the fuel cell 2 at the inlet side of the hydrogen electrode 2A, is provided at the hydrogen-circulating passage 4A. The time, from the valve-opening starting time of the hydrogen shut-off valve 6 to the valve-opening starting time of a hydrogen purge valve 10 is set, in response to the detected value by the pressure sensor 9. When this time has elapsed, the pressure of the inlet side of the hydrogen electrode 2A is considered to have risen to "atmospheric pressure + several kPas", and the hydrogen purge valve 10 is opened. <P>COPYRIGHT: (C)2004,JPO |
