| 摘要 |
An arrangement for high temperature fuel cell system for substantially reducing the amount of purge gas in an emergency shut-down situation. The arrangement includes a known volume for containing a pneumatic actuation pressure, the known volume including at least one discharge route for designed discharge rate, at least one pressure source providing pressure capable of performing the pneumatic actuation, at least one purge gas source having a gas overpressure capable of displacing residual reactants in the fuel cell system. Purge gas is discharged through the discharge route causing pressure decline in the known volume, accomplishing a designed time delay in state change of at least one pneumatically actuated valve, to reduce or close down completely emergency shutdown actuated flow of the purge gas into the fuel cell system piping after the designed time delay. |
| 主权项 |
1. An arrangement suitable for use in a high temperature fuel cell system, for reducing an amount of a purge gas in an emergency shut-down situation, wherein the system comprises a fuel cell including an anode side, a cathode side, and an electrolyte between the anode side and the cathode side, and a fuel cell system piping for reactants, wherein the arrangement is located in the cathode side of the high temperature fuel cell system for reducing the amount of purge gas in the cathode side in the emergency shut-down situation, the arrangement comprising:
a known volume for containing a pneumatic actuation pressure, wherein the known volume comprises at least one discharge route, at least one pressure source providing pressure capable of performing the pneumatic actuation, at least one purge gas source containing as the purge gas nitrogen or nitrogen with an amount of oxygen, wherein the purge gas is directed to the cathode side of the fuel cell system to lessen or prevent oxygen from bleeding to the anode side of the fuel cell system from the cathode side of the fuel cell system to lessen or avoid anode side oxidation, where the purge gas source has a gas overpressure capable of displacing residual reactants in the fuel cell system, at least one valve for connecting the purge gas source to the fuel cell system piping, means for injecting a purge gas flow to the fuel cell system piping from the at least one purge gas source through said at least one valve, means for isolating the known volume from said at least one pressure source and for pressurizing the known volume, at least one pneumatically actuated valve utilizing pressure of the known volume for retaining a state of the at least one pneumatically actuated valve, and means for closing at least one pipe outlet of the fuel cell system to lessen or prevent a gas flow from exiting the fuel cell system, wherein the known volume is pressurized in normal operation by the pressure source, and in an emergency shutdown the known volume is disconnected from the pressure source, purge gas is discharged through the discharge route causing pressure decline in the known volume, accomplishing a designed time delay in a state change of at least one pneumatically actuated valve, to reduce or close down completely an emergency shutdown actuated flow of purge gas into the fuel cell system piping after the designed time delay. |
