| 摘要 |
PROBLEM TO BE SOLVED: To suppress backflow from the confluence between a circulation passage and a bypass toward a hydrogen pump side without using a check valve.SOLUTION: A gas circulation system RS comprises a backflow preventing device 9 which supplies the gases flowing in from upstream of a circulation passage 5 to downstream of the circulation passage 5 while suppressing gas inflow into a bypass 7 in the confluence M between the circulation passage 5 and the bypass 7. The backflow preventing device 9 includes a throttling unit T which throttles a flow of gases flowing in from upstream of the circulation passage 5, and a guiding passage unit G which guides the gases flowing in from the bypass 7 by the gases flowing out from the throttling unit T into an anode gas inlet 1b.SELECTED DRAWING: Figure 2 |
