| 摘要 |
PURPOSE:To eliminate a supply work and a deficiency of oxygen and realize a stable unmanned operation by installing a unit which concurrently carries out formation of nitrogen as purge gas and its concentration necessary for mixing it into reaction air. CONSTITUTION:Nitrogen 7N separated by making one of a pair of adsorption tanks 7A, 7B of a pressure-swing type adsorption device 10 work as an adsorption tank of oxygen in compressed air is kept in a storage tank 8; and concurrently making the other of the adsorption tanks 7A, 7B work as an elimination tank of oxygen, the gas which is rich in an eliminated oxygen is kept in a storage tank 9; thereby, a formation source where purge nitrogen 7N and supply oxygen 9A are simultaneously generated by use of air as raw material is formed. It is possible, therefore, to supply a reservoired nitrogen 8A in a necessary quantity through a purge gas supply line 25 at the time of stop of power generation operation. When a load of a cell 1 rapidly increases, it is possible to increase a concentration of oxygen in a reaction air 3A by supplying a reservoired oxygen 9A mixed into the reaction air 3A. Thereby, a supply work of oxygen caused by a deficiency of oxygen becomes unnecessary, so that it is possible to perform a stable unmanned operation. |
