IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0744417
(2013-01-18)
|
등록번호 |
US-9401520
(2016-07-26)
|
우선권정보 |
JP-2012-010599 (2012-01-23) |
발명자
/ 주소 |
- Furusawa, Koichiro
- Nakajima, Nobutaka
- Yamazaki, Kaoru
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
1 |
초록
▼
In a method for stopping an operation of a fuel cell system, supply of a fuel gas to an anode side of a fuel cell provided in the fuel cell system is stopped. A fuel exhaust gas discharged from the fuel cell is recirculated to the anode side of the fuel cell. An oxidant-exhaust-gas discharge path th
In a method for stopping an operation of a fuel cell system, supply of a fuel gas to an anode side of a fuel cell provided in the fuel cell system is stopped. A fuel exhaust gas discharged from the fuel cell is recirculated to the anode side of the fuel cell. An oxidant-exhaust-gas discharge path through which an oxidant exhaust gas is to be discharged from the fuel cell is sealed at a downstream position of a connecting portion at which the oxidant-exhaust-gas discharge path is connected to an oxidant-exhaust-gas recirculation path. The oxidant exhaust gas is recirculated to a cathode side of the fuel cell through the oxidant-exhaust-gas recirculation path. Recirculation of the fuel exhaust gas is stopped. Recirculation of the oxidant exhaust gas is stopped. An oxidant-gas supply path through which an oxidant gas is to be supplied to the fuel cell is sealed.
대표청구항
▼
1. A method for stopping an operation of a fuel cell system, the method comprising: raising an anode pressure of a fuel cell provided in the fuel cell system to a predetermined pressure, the anode pressure being a pressure on an anode side of a fuel cell provided in the fuel cell system;recirculatin
1. A method for stopping an operation of a fuel cell system, the method comprising: raising an anode pressure of a fuel cell provided in the fuel cell system to a predetermined pressure, the anode pressure being a pressure on an anode side of a fuel cell provided in the fuel cell system;recirculating a fuel exhaust gas discharged from the fuel cell to the anode side of the fuel cell;sealing an oxidant-exhaust-gas discharge path through which an oxidant exhaust gas is to be discharged from the fuel cell at a downstream position of a connecting portion at which the oxidant-exhaust-gas discharge path is connected to an oxidant-exhaust-gas recirculation path;recirculating the oxidant exhaust gas to a cathode side of the fuel cell through the oxidant-exhaust-gas recirculation path;consuming the oxidant gas by generating power with the fuel cell after increasing the anode pressure so that the anode pressure decreases;stopping recirculation of the fuel exhaust gas;stopping recirculation of the oxidant exhaust gas; andsealing an oxidant-gas supply path through which the oxidant gas is to be supplied to the fuel cell at a downstream position of a connecting portion at which the oxidant-gas supply path is connected to an oxidant-exhaust-gas recirculation path. 2. The method according to claim 1, further comprising: determining that a remaining oxidant gas on the cathode side of the fuel cell is consumed,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if it is determined that the remaining oxidant gas on the cathode side of the fuel cell is consumed,wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if it is determined that the remaining oxidant gas on the cathode side of the fuel cell is consumed, andwherein the sealing of the oxidant-gas supply path includes sealing the oxidant-gas supply path if it is determined that the remaining oxidant gas on the cathode side of the fuel cell is consumed. 3. The method according to claim 1, further comprising: determining that the anode pressure becomes less than the predetermined pressure,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the anode pressure becomes less than the predetermined pressure,wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the anode pressure becomes less than the predetermined pressure, andwherein the sealing of the oxidant-gas supply path includes sealing the oxidant-gas supply path if the anode pressure becomes less than the predetermined pressure. 4. The method according to claim 1, further comprising: determining that a cell voltage of the fuel cell becomes less than a predetermined value,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the cell voltage of the fuel cell becomes less than the predetermined value,wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the cell voltage of the fuel cell becomes less than the predetermined value, andwherein the sealing of the oxidant-gas supply path includes sealing the oxidant-gas supply path if the cell voltage of the fuel cell becomes less than the predetermined value. 5. The method according to claim 1, further comprising: determining that a total voltage of the fuel cell becomes less than a predetermined value,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the total voltage of the fuel cell becomes less than the predetermined value,wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the total voltage of the fuel cell becomes less than the predetermined value, andwherein the sealing of the oxidant-gas supply path includes sealing the oxidant-gas supply path if the total voltage of the fuel cell becomes less than the predetermined value. 6. The method according to claim 1, further comprising: controlling a generation voltage of the fuel cell when the fuel cell generates power by using the fuel exhaust gas and the oxidant exhaust gas. 7. The method according to claim 6, wherein the controlling of the generation voltage of the fuel cell includes controlling the generation voltage so that a generation current of the fuel cell becomes less than a predetermined maximum generation current. 8. The method according to claim 6, wherein the controlling of the generation voltage of the fuel cell includes controlling the generation voltage so that a variation width of the generation voltage becomes less than a predetermined maximum variation width. 9. The method according to claim 6, wherein the controlling of the generation voltage of the fuel cell includes controlling the generation voltage to be held at a constant voltage for a predetermined time. 10. The method according to claim 9, wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if a predetermined time elapses from a timing at which a generation current of the fuel cell has become less than a predetermined threshold value in the controlling of the generation voltage,wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the predetermined time elapses from a timing at which the generation current of the fuel cell has become less than the predetermined threshold value in the controlling of the generation voltage, andwherein the sealing of the oxidant-gas supply path includes sealing the oxidant-gas supply path if the predetermined time elapses from a timing at which the generation current of the fuel cell has become less than the predetermined threshold value in the controlling of the generation voltage. 11. The method according to claim 1, further comprising: supplying the oxidant gas to a diluter through a bypass path to purge the diluter. 12. A method for stopping an operation of a fuel cell system, the method comprising: raising an anode pressure of a fuel cell provided in the fuel system to a predetermined pressure, the anode pressure being a pressure on an anode side of the fuel cell;recirculating a fuel exhaust gas discharged from the fuel cell to the anode side of the fuel cell;sealing an oxidant-gas supply path through which an oxidant gas is to be supplied to the fuel cell at an upstream position of a connecting portion at which the oxidant-gas supply path is connected to an oxidant-exhaust-gas recirculation path;sealing an oxidant-exhaust-gas discharge path through which an oxidant exhaust gas is to be discharged from the fuel cell at a downstream position of a connecting portion at which the oxidant-exhaust-gas discharge path is connected to the oxidant-exhaust-gas recirculation path;recirculating the oxidant exhaust gas to a cathode side of the fuel cell through the oxidant-exhaust-gas recirculation path;consuming the oxidant gas by generating power with the fuel cell after increasing the anode pressure so that the anode pressure decreases;stopping recirculation of the fuel exhaust gas; andstopping recirculation of the oxidant exhaust gas. 13. The method according to claim 12, further comprising: determining that a remaining oxidant gas on the cathode side of the fuel cell is consumed,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if it is determined that the remaining oxidant gas on the cathode side of the fuel cell is consumed, andwherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if it is determined that the remaining oxidant gas on the cathode side of the fuel cell is consumed. 14. The method according to claim 12, further comprising: determining that the anode pressure which is a pressure becomes less than the predetermined pressure,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the anode pressure becomes less than the predetermined pressure, andwherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the anode pressure becomes less than the predetermined pressure. 15. The method according to claim 12, further comprising: determining that a cell voltage of the fuel cell becomes less than a predetermined value,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the cell voltage of the fuel cell becomes less than the predetermined value, andwherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the cell voltage of the fuel cell becomes less than the predetermined value. 16. The method according to claim 12, further comprising: determining that a total voltage of the fuel cell becomes less than a predetermined value,wherein the stopping of the recirculation of the fuel exhaust gas includes stopping the recirculation of the fuel exhaust gas if the total voltage of the fuel cell becomes less than the predetermined value, andwherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas if the total voltage of the fuel cell becomes less than the predetermined value. 17. The method according to claim 12, further comprising: controlling a generation voltage of the fuel cell when the fuel cell generates power by using the fuel exhaust gas and the oxidant exhaust gas. 18. The method according to claim 12, wherein the raising the anode pressure to the predetermined pressure provides an amount of hydrogen that is consumed during the step of recirculating the fuel exhaust gas and provides an amount of hydrogen that is held in the anode passage after the operation is stopped. 19. The method according to claim 12, wherein the stopping of the recirculation of the oxidant exhaust gas includes stopping the recirculation of the oxidant exhaust gas based on a voltage profile. 20. The method according to claim 12, further comprising closing a shutoff valve that supplies a fuel gas from a fuel source to the fuel cell, wherein the raising of the anode pressure of the fuel cell includes raising the anode pressure to the predetermined pressure while the shutoff valve is closed. 21. The method according to claim 20, wherein the raising of the anode pressure of the fuel cell to the predetermined pressure is performed by raising the pressure of fuel gas remaining in the anode side of the fuel cell after closing the shutoff valve.
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