Operation method and purging system for a hydrogen demand/delivery unit in a fuel cell system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-008/00
H01M-008/04
출원번호
US-0771171
(2004-02-03)
등록번호
US-7354669
(2008-04-08)
우선권정보
DE-103 14 820(2003-04-01)
발명자
/ 주소
Hobmeyr,Ralph T. J.
Wexel,Dirk M.
출원인 / 주소
General Motors Corporation
인용정보
피인용 횟수 :
6인용 특허 :
2
초록▼
The invention pertains to a process for preventing the freezing of water in a structural component containing at least one moving part in the anode cycle of a fuel cell system, characterized by the fact that at the time of a switching-off process the structural component is scavenged by a dry scaven
The invention pertains to a process for preventing the freezing of water in a structural component containing at least one moving part in the anode cycle of a fuel cell system, characterized by the fact that at the time of a switching-off process the structural component is scavenged by a dry scavenging gas in order to remove a quantity of water present there.
대표청구항▼
The invention claimed is: 1. Fuel cell system with several fuel cells assembled to form a fuel cell stack which has an anode side, a cathode side and a membrane arranged between the anode side and the cathode side, the anode sides of the fuel cells being connected to form an anode cycle, which addi
The invention claimed is: 1. Fuel cell system with several fuel cells assembled to form a fuel cell stack which has an anode side, a cathode side and a membrane arranged between the anode side and the cathode side, the anode sides of the fuel cells being connected to form an anode cycle, which additionally includes a feeding device for fresh gaseous fuel, a drain valve for continuous or discontinuous discharging of at least part of the gases flowing in the anode cycle as well as a component having at least one movable part and having spaces therein, the component returning at least a portion of the exhaust gases emerging from the anode side of the fuel cells to the anode sides of the fuel cells, and a scavenging gas inlet, arranged to supply dry compressed air to the component and deliver it through the spaces in order to expel and/or dry out water, an air compressor which delivers compressed air to the cathode sides of the fuel cells and a connecting line from the air compressor to the scavenging gas inlet. 2. Fuel cell system according to claim 1, wherein an air dryer is provided between the air compressor and the scavenging gas inlet. 3. Fuel cell system according to claim 1, wherein a valve is provided in the connecting line which valve is connected to a control in which the opening time of the valve and/or the flow opening of the valve are determined. 4. Fuel cell system according to claim 1, wherein a check valve is installed in the connecting line. 5. Fuel cell system according to claim 1 wherein a device is provided which governs the supply of the dry compressed air. 6. Fuel cell system according to claim 5, wherein the device is designed in such a way as to allow for the quantity of water to be driven out and/or dried when governing the feed of the dry compressed air. 7. Fuel cell system according to claim 5, further comprising an outside temperature sensor, the outside temperature sensor being coordinated with the device. 8. Fuel cell system according to claim 5 wherein the device is designed for controlling the feed of compressed air so as to deliver compressed air only when temperatures are anticipated which permit a possible freezing of the component to be expected. 9. Fuel cell system according to claim 5, wherein the device governing the feed of dry compressed air is coordinated with a device registering the historical curve of the ambient temperature in a time interval preceding the present switching off of the fuel cell system. 10. Fuel cell system according to claim 9, wherein the device registering the historical curve of the ambient temperature includes at least one temperature sensor, a timer and a storage memory for the time-dependent storage of the temperature that is measured by the temperature sensor. 11. Fuel cell system according to claim 9, wherein an inputting device is provided with which the time interval following the switching off of the fuel cell system can be inputted. 12. Fuel cell system according to claim 8, wherein the device governing the feed of the dry compressed air has a part for receiving a meteorological signal which serves to activate the device. 13. Fuel cell system according to claim 5 wherein the device for governing the feed of the dry compressed air permits the compressed air to be supplied only when the fuel cell system is switched off. 14. Fuel cell system according to claim 1, wherein the component is a compressor. 15. Fuel cell system according to claim 14 in which the compressor has a motor space arranged inside a housing, a conveyer space arranged at the end of the housing and a connections space arranged at the other end of the housing, the conveyer space containing a rotor, which draws gaseous fuel through an inlet, raises the pressure of the gaseous fuel, and supplies it subsequently through an outlet to the anode sides of the fuel cells, a stator arranged in the motor space in the housing and a rotor arranged on a drive shaft the drive shaft driving the rotor and in the connections space the electrical connections, wherein the scavenging gas inlet is provided in the connections space, and compressed air is fed into the connections space, the compressed air subsequently flowing into the motor space between the rotor and the stator and past the rotor and stator and subsequently enters into the conveyer space and there scavenges gaps between the rotor and the housing surrounding the rotor. 16. Fuel cell system according to claim 14, wherein after passing through the gaps, the dry compressed air leaves the conveyer space through the outlet. 17. Fuel cell system according to claim 14, wherein the dry compressed air after leaving the outlet flows through the anode cycle and exits from the drain valve. 18. Fuel cell system according to claim 14 wherein a bearing cover arranged between the rotor and the rotor wheel coordinated with the compressor housing is provided with a boring which guides the compressed air into the conveyer space or the housing surrounding it where it flows through the gaps. 19. Fuel cell system according to claim 14 wherein a motor controller is provided in the connections space and can also be scavenged with compressed air before it flows on into the motor space. 20. Fuel cell system according to claim 14 wherein the connections space is equipped with a gastight electric plug-in connection. 21. Fuel cell system according to claim 14 wherein the compressor with the drive shaft is arranged generally vertically and with the inlet to the conveyer space below it. 22. Fuel cell system according to claim 14 wherein the compressor is water or air cooled. 23. Fuel cell system according to claim 13 wherein all surfaces of the compressor which come into contact with condensing water vapor or water are arranged for drainage of the water. 24. Fuel cell system according to claim 13 wherein the compressor is a side channel compressor. 25. Fuel cell system according to claim 13 wherein the compressor is a turbocompressor. 26. Fuel cell system according to claim 1 wherein the component is a pump having an, a water collecting device is provided at the outlet, the system further comprising a drain line , a first valve in the water collecting device and a second valve on a downstream side of the water collecting device, said second valve in an open first valve open and with feeding of a compressed air the water collected in the water collecting device can be drained out through the drain line. 27. Fuel cell system according to claim 1 wherein the component is a pump having an inlet, a water collecting device is provided at the inlet, the system further comprising, a drain line, a first valve in the water collecting device and a second valve on the downstream side of the water collecting device, the second valve in an open state permitting a flow into inlet of the pump, and in a closed state and with the first valve open and with feeding of a compressed air the water collected in the water collecting device can be discharged through the drain line. 28. Fuel cell system according to claim 26, wherein another valve is coordinated with the outlet of the pump in which case the normally open other valve can be closed when water is discharged from the drain line.
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이 특허에 인용된 특허 (2)
Bushnell Calvin L. (Glastonbury CT) Davis Christopher L. (Tolland CT), Reactant gas composition for fuel cell potential control.
Wilkinson David P. (Vancouver CAX) Voss Henry H. (West Vancouver CAX) Watkins David S. (Coquitlam CAX) Prater Keith B. (Vancouver CAX), Solid polymer fuel cell systems incorporating water removal at the anode.
Harr, Oliver; Knoop, Andreas; Mazzotta, Cosimo S.; Padgett, Patrick L.; Schabel, Hans-Joerg; Scherrbacher, Klaus, Pump and fuel cell system having a pump.
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