IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0931874
(2007-10-31)
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등록번호 |
US-8512902
(2013-08-20)
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발명자
/ 주소 |
- Blaszczyk, Janusz
- Bach, Peter J.
- Procter, Michael J.
- Sexsmith, Michael P.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
7 |
초록
▼
A fuel cell stack comprising a fuel inlet and an oxidant inlet for allowing the supply of a fuel and an oxidant to the fuel cell stack, respectively, and a fuel outlet and an oxidant outlet for allowing the removal of an anode exhaust and a cathode exhaust from the fuel cell stack, respectively, whe
A fuel cell stack comprising a fuel inlet and an oxidant inlet for allowing the supply of a fuel and an oxidant to the fuel cell stack, respectively, and a fuel outlet and an oxidant outlet for allowing the removal of an anode exhaust and a cathode exhaust from the fuel cell stack, respectively, wherein the fuel outlet is fluidly connected to a high frequency purge valve.
대표청구항
▼
1. A fuel cell system, comprising: a fuel cell stack,a fuel inlet and an oxidant inlet,a fuel outlet and an oxidant outlet for removing an anode exhaust and a cathode exhaust from the fuel cell stack, respectively,a conduit for communicating between an oxygen source and the oxygen inlet and a condui
1. A fuel cell system, comprising: a fuel cell stack,a fuel inlet and an oxidant inlet,a fuel outlet and an oxidant outlet for removing an anode exhaust and a cathode exhaust from the fuel cell stack, respectively,a conduit for communicating between an oxygen source and the oxygen inlet and a conduit for communicating between a fuel source and the fuel inlet,wherein the fuel outlet is fluidly connected to a high frequency pulse-width modulated (PWM) purge valve, wherein the purge valve is configured to open for purges at a frequency of equal to or greater than 10 Hz, and wherein the ratio of the open time interval to the closed time interval ranges from 2%:98% to 98%:2% for any given frequency,a detector for detecting at least one operational characteristic of at least one fuel cell in the fuel cell stack, anda controller for controlling at least one operating parameter of the high frequency purge valve based on an input from the detector relating to the at least one detected operational characteristic. 2. The fuel cell system of claim 1 wherein the high frequency purge valve is operable to actuate at a frequency of at least 60 Hz. 3. The fuel cell system of claim 1 wherein the high frequency purge valve is operable to actuate at a frequency of at least 100 Hz. 4. The fuel cell system of claim 1 wherein the at least one operational characteristic is selected from the group consisting of a voltage, applied load, power output, and resistance of one or more fuel cells in the fuel cell stack. 5. The fuel cell system of claim 1 wherein the at least one operational characteristic is selected from the group consisting of a hydrogen concentration of the anode exhaust and an oxidant flow rate. 6. The fuel cell system of claim 1 wherein the at least one operating parameter of the purge valve is selected from the group consisting of a frequency, an open time interval, a close time interval, and an open-close interval ratio. 7. A method of operating a fuel cell system having a fuel cell stack, an anode side and a cathode side and comprising a fuel inlet and an oxidant inlet for supplying a fuel and an oxidant to the fuel cell stack, respectively, a fuel outlet and an oxidant outlet for removing an anode exhaust and a cathode exhaust from the fuel cell stack, respectively, wherein an oxidant source is fluidly coupled via a conduit to the oxygen inlet, and wherein a high frequency pulse-width modulated (PWM) purge valve is fluidly connected on one side to the fuel outlet, the method comprising the steps of: providing the fuel and oxidant to the fuel cell stack;drawing a load from the fuel cell stack;detecting at least one operational characteristic of at least one fuel cell in the fuel cell stack during operation,determining at least one operating parameter of the purge valve based on the at least one operating parameter, andoperating a controller for controlling at least one operating parameter of the high frequency pulse-width modulated purge valve based on an input from the detector relating to the at least one detected operational characteristic, wherein the pulse-width modulated purge valve is actuated at a frequency of equal to or greater than 10 Hz, and wherein the ratio of the open time interval to the closed time interval ranges from 2%:98% to 98%:2% for any given frequency. 8. The method of claim 7 wherein actuating the purge valve comprises the steps of opening the purge valve for an open time interval and closing the purge valve for a close time interval. 9. The method of claim 7 wherein the detected at least one operational characteristic of the fuel cell stack is selected from the group consisting of a voltage, load drawn, power output, and resistance of one or more fuel cells in the stack. 10. The method of claim 7 wherein the detected at least one operational characteristic of the fuel cell stack is selected from the group consisting of a hydrogen concentration of the anode exhaust and an oxidant flow rate. 11. The method of claim 7 wherein the frequency of opening and closing the purge valve is at least 60 Hz. 12. The method of claim 7 wherein the frequency of opening and closing the purge valve is at least 100 Hz. 13. The method of claim 7 wherein the fuel cell stack is fluidly connected to an anode recirculation loop, the anode recirculation loop fluidly connecting the fuel outlet to the fuel inlet of the fuel cell stack, the method further comprising the step of recirculating at least a portion of the anode exhaust from the fuel outlet to the fuel inlet. 14. The fuel cell system of claim 1 wherein the fuel cell stack is fluidly connected to an anode recirculation loop, the anode recirculation loop fluidly connecting the fuel cell stack fuel outlet to the of the fuel cell stack fuel inlet.
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