| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a concentration method of phosphoric acid in a phosphoric acid fuel cell capable of detection by a simple device in which a low concentration of a phosphoric acid electrolytic solution is concentrated to a target concentration. <P>SOLUTION: In the concentration method of phosphoric acid in the phosphoric acid fuel cell to make phosphoric acid concentration of an electrolyte the target concentration or more by supplying gas to a gas inlet of a fuel cell stack, the gas which keeps temperature of the fuel cell stack to be a prescribed temperature, and of which humidity is controlled so that a dew-point measured value at the gas inlet becomes equal to the dew-point (dew-point target value) of the gas in equilibrium with phosphoric acid of the target concentration at the prescribed temperature is supplied, and until the dew-point measured value of the gas passing through a gas outlet reaches the dew-point target value, supply of the gas is continued. <P>COPYRIGHT: (C)2011,JPO&INPIT |
