Fuel cell system and method of controlling same
View Patent ↗A fuel cell system includes a fuel cell configured to generate electric power with a fuel gas and an oxygen gas fed to the fuel cell and to discharge exhaust gas including CO 2 as a result of generating the electric power; a CO extraction part configured to reduce the CO 2 in the exhaust gas fed to the CO extraction part to CO, the CO extraction part including a processing container fed with the exhaust gas and a CO 2 adsorbing member provided in the processing container and formed of an oxide having an oxygen deficiency; and a CO recycling part configured to feed the extracted CO to the fuel cell as part of the fuel gas.
1. A fuel cell system, comprising:
a fuel cell configured to generate electric power with a fuel gas and oxygen gas fed thereto and to discharge an exhaust gas including CO 2 as a result of generating the electric power;
a CO extraction part configured to reduce the CO 2 in the exhaust gas fed thereto to CO, the CO extraction part including
a processing container fed with the exhaust gas; and
a CO 2 adsorbing member provided in the processing container and formed of an oxide having an oxygen deficiency, wherein the CO 2 adsorbing member is configured to adsorb CO 2 molecules in the fed exhaust gas and to decompose the adsorbed CO 2 molecules into CO molecules and oxygen atoms; and
a CO recycling part configured to feed the CO extracted by the CO extraction part to the fuel cell as a part of the fuel gas.
2. The fuel cell system as claimed in claim 1 , wherein the oxide has a perovskite structure.
3. The fuel cell system as claimed in claim 1 , wherein the CO extraction part further includes:
a heating part configured to heat the CO 2 adsorbing member.
4. The fuel cell system as claimed in claim 3 , wherein the heating part is configured to heat the CO 2 adsorbing member with the exhaust gas.
5. The fuel cell system as claimed in claim 3 , wherein the heating part is configured to heat the CO 2 , adsorbing member to one of a first temperature of 200° C. to 300° C. and a second temperature of 600° C. to 700° C.
6. The fuel cell system as claimed in claim 1 , wherein the CO extraction part further includes:
a cooling part configured to cool the CO 2 adsorbing member to a room temperature.
7. The fuel cell system as claimed in claim 1 , wherein the CO extraction part further includes:
a pump configured to evacuate the processing container.
8. The fuel cell system as claimed in claim 1 , wherein the CO recycling part includes:
a tank configured to retain the CO generated by the reduction in the CO extraction part; and
a CO gas adding part configured to add the CO in the tank to the fuel gas.
9. The fuel cell system as claimed in claim 1 , further comprising:
a culturing tank configured to be fed with the exhaust gas from the CO extraction part, the exhaust gas including a remaining portion of the CO 2 unreduced in the CO extraction part, and to culture algae using the remaining portion of the CO 2 as a nutrient.