IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0226360
(2007-02-14)
|
등록번호 |
US-8557455
(2013-10-15)
|
우선권정보 |
AT-A 782/2006 (2006-05-05) |
국제출원번호 |
PCT/AT2007/000080
(2007-02-14)
|
§371/§102 date |
20081016
(20081016)
|
국제공개번호 |
WO2007/128007
(2007-11-15)
|
발명자
/ 주소 |
- Wahlmüller, Ewald
- Riffelsberger, Christian
- Rumpl, Werner
|
출원인 / 주소 |
- Fronius International GmbH
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
A method for controlling the anode pressure of a fuel cell is disclosed, with hydrogen fed to the anode via a feed-pressure control unit, and a gas/condensate mixture periodically discharged from the anode via a discharge-pressure control unit into a reservoir, with the gas portion fed back to the a
A method for controlling the anode pressure of a fuel cell is disclosed, with hydrogen fed to the anode via a feed-pressure control unit, and a gas/condensate mixture periodically discharged from the anode via a discharge-pressure control unit into a reservoir, with the gas portion fed back to the anode. To effect feedback of hydrogen the pressure in the reservoir is adapted to that in the hydrogen feed means during discharge, whereupon the discharge-pressure control unit is closed and the feed-pressure control unit and a feedback-pressure control unit are controlled such that the pressure in the reservoir changes due to consumption at the anode until a desired pressure in the reservoir is reached and/or a preset pressure in the anode is reached, whereupon the feedback-pressure control unit and the feed-pressure control unit are controlled such that the pressure in the anode adapts to a preset desired value.
대표청구항
▼
1. A method for controlling the feedback of hydrogen from a reservoir to an anode of a fuel cell, comprising the following steps: feeding hydrogen to the anode via a feed-pressure control unit;feeding oxygen or air to a cathode;periodically discharging a mixture which consists of a gas portion and a
1. A method for controlling the feedback of hydrogen from a reservoir to an anode of a fuel cell, comprising the following steps: feeding hydrogen to the anode via a feed-pressure control unit;feeding oxygen or air to a cathode;periodically discharging a mixture which consists of a gas portion and a condensate, from the anode in a discharge cycle via a discharge line and a discharge-pressure control unit to a reservoir by periodically opening the discharge pressure control unit when the pressure prevailing in the reservoir is lower than the pressure in a feed means of hydrogen, the discharge cycle comprising the following steps:(a) increasing the pressure prevailing in the feed means of hydrogen above a desired value,(b) opening the discharge-pressure control unit for discharging the mixture to the reservoir when the increased pressure is achieved,(c) maintaining the increased pressure prevailing in the feed means of hydrogen during discharging of the mixture to the reservoir so that the pressure in the reservoir is increased,collecting and separating the mixture in the reservoir into a gas portion and a condensate;feeding the gas portion back to the anode without the use of a hydrogen pump, the step of feeding the gas portion back comprising the following steps:i. closing the discharge-pressure control unit and the feed-pressure control unit when a difference between the pressure in the anode and the pressure in the reservoir reaches a preset minimum level;ii. thereafter opening a feedback-pressure control unit connected to a feedback line when the pressure in the anode drops to a pre-set threshold level, whereupon hydrogen in the reservoir is fed back in the feedback line to the anode without the use of a hydrogen pump, due to the pressure difference between the reservoir and the anode; andiii. closing the feedback pressure control unit and opening the feed pressure control unit when the pressure in the reservoir drops to a desired value. 2. The method according to claim 1, wherein the discharge cycle is started as a function of the cell voltages of the fuel cell. 3. The method according to claim 1, wherein during step (a) of the discharge cycle, the pressure in the feed means of hydrogen is increased from a preset desired value of about 0.4 bar to about 0.45 bar. 4. The method according to claim 1, wherein the desired value of pressure prevailing in the reservoir is about 0.2 bar. 5. The method according to claim 4, wherein the pressure prevailing in the reservoir is increased from the desired value of about 0.2 bar to about 0.4 bar during step (c) of the discharge cycle. 6. The method according to claim 1, wherein after step (iii) the pressure in the feed means of hydrogen is then increased to a desired value which lies in the range of about 0.4 bar. 7. The method according to claim 1, wherein the discharge cycle is effected within a period of between one second and ten seconds. 8. The method according to claim 6, wherein between the discharge cycles, the pressure in the feed means of hydrogen is kept constant at the desired value thereof and the pressure prevailing in the reservoir is kept constant at the desired value thereof. 9. The method according to claim 1, wherein the functions of the fuel cell are completely maintained, irrespective of the changes in pressure. 10. The method according to claim 1, wherein the gas portion is fed back to the feed means of hydrogen. 11. The method according to claim 1, further comprising the step of periodically discharging the condensate from the reservoir between discharge cycles after the mixture has been discharged approximately ten to twenty times. 12. The method according to claim 1, wherein the condensate in the reservoir is admixed to oxygen-feed or air-feed means of the cathode via a condensate-pressure control unit. 13. The method according to claim 12, wherein pressure in the air-feed means is reduced for a period during which the condensate is admixed. 14. The method according to claim 11, wherein the condensate in the reservoir is admixed to an exhaust air of the cathode of the fuel cell via a condensate-pressure control unit. 15. A method for controlling the feedback of hydrogen from a reservoir to an anode of a fuel cell, comprising the following steps: feeding hydrogen to the anode via a feed-pressure control unit;feeding oxygen or air to a cathode;periodically discharging a mixture which consists of a gas portion and a condensate, from the anode in a discharge cycle via a discharge line and a discharge-pressure control unit to a reservoir by periodically opening the discharge pressure control unit when the pressure prevailing in the reservoir is lower than the pressure in a feed means of hydrogen, the discharge cycle comprising the following steps:(d) increasing the pressure prevailing in the feed means of hydrogen above a desired value,(e) opening the discharge-pressure control unit for discharging the mixture to the reservoir when the increased pressure is achieved,(f) maintaining the increased pressure prevailing in the feed means of hydrogen during discharging of the mixture to the reservoir so that the pressure in the reservoir is increased,collecting and separating the mixture in the reservoir into a gas portion and a condensate;feeding the gas portion back to the anode without the use of a hydrogen pump, the step of feeding the gas portion back comprising the following steps:i. closing the discharge-pressure control unit and the feed-pressure control unit when a difference between the pressure in the anode and the pressure in the reservoir reaches a preset minimum level;ii. opening the discharge-pressure control unit when the pressure in the anode drops to a pre-set threshold level, whereupon hydrogen in the reservoir is fed back to the anode without the use of a hydrogen pump, due to the pressure difference between the reservoir and the anode; andiii. closing the discharge pressure control unit and opening the feed pressure control unit when the pressure in the reservoir drops to a desired value. 16. A fuel cell comprising: at least one cell with one anode and one cathode each,a hydrogen-feed means connected with the anode, said hydrogen-feed means comprising a feed-pressure means,an oxygen-feed or air-feed means connected to the cathode;a discharge line connected to the anode, said discharge line comprising a discharge-pressure control unit, for discharging a mixture consisting of a gas portion and a condensate,a reservoir connected with the discharge line and with the anode via a feedback line for feeding back hydrogen separated from the reservoir;a feedback-pressure control unit arranged in the feedback line; anda control means connected to the feedback-pressure control unit, the feed-pressure control unit and the discharge-pressure control unit, so that the control means opens the discharge-pressure control unit for periodically discharging the mixture, and the mixture is conveyed into the reservoir via the discharge line when the pressure prevailing in the reservoir is lower than that in the feed means of hydrogen,wherein the control means is configured to control the pressure prevailing in the reservoir based on the pressure in the feed means of hydrogen,wherein during discharge, the control means is configured to increase the pressure in the feed means and maintain the increased pressure until the pressure difference between the feed means of hydrogen and the reservoir reaches a preset minimum level,wherein during feedback, the control means is configured to close the feed-pressure control unit and discharge-pressure control unit when the pressure difference reaches the preset minimum level, which then reduces the pressure in the anode to a threshold value that substantially corresponds to the desired value of the pressure prevailing in the reservoir, and opens the feedback pressure control unit after the threshold value in the anode is reached to supply the anode with hydrogen from the gas portion in the reservoir via the feedback line without the use of a hydrogen pump,wherein when the pressure in the reservoir reaches the desired level, the control means is configured to close feedback-pressure control unit and opens the feed-pressure control unit to finish the discharge cycle. 17. The fuel cell according to claim 16, wherein the reservoir is connected with a discharge line, which includes a condensate-pressure control unit, for discharging the condensate from the reservoir. 18. The fuel cell according to claim 17, wherein the discharge line provided for the condensate is connected with the oxygen-feed or air-feed means of the cathode. 19. The fuel cell according to claim 16, wherein the discharge line for the condensate is connected with a discharge line of the cathode provided for exhaust air. 20. The fuel cell according to claim 17, wherein at least one of the discharge-pressure control unit, the feedback-pressure control unit and the condensate-pressure control unit is formed by switch valves. 21. The fuel cell according to claim 16, wherein the feed-pressure control unit is formed by a control valve. 22. The fuel cell according to claim 16, wherein the feedback-pressure control unit is formed by a non-return valve. 23. The fuel cell according to claim 16, wherein the control means is connected with a unit for detecting cell voltage.
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