| 摘要 |
PURPOSE:To perform the stable long-term power generation operation by providing multi-stage comparators in a judging circuit and performing the control in response to the leaked combustible gas concentration. CONSTITUTION:When fuel gas 9 is leaked in a cell, the light combustible gas is floated in a frame 2 and collected from the frame 2 into a collecting chamber 21 protruded upward. When the combustible gas concentration in the collecting chamber 21 is increased, the level of the concentration actual signal 6A of a detector 6 is increased. The signal 6A is compared with set values of the corresponding first-stage comparator 22, second-stage comparator 23, and highest-level comparator 24 by a judging circuit 20, control signals 22C-24C are issued when they are higher than the set values. The signal 22C opens a solenoid valve 27B and releases the mixed gas 31 from a releasing mechanism section 27, the signal 23C releases the gas 31 from a releasing mechanism section 28. The signal 24C controls and operates an abnormality control circuit 25 and issues an alarm 25A and stops the operation. The situation is coped with in stages, the operation is not stopped when the level of the signal 6A is lowered at the low stage, thereby the stable long-term operation can be performed. |
