Fuel cell
A solid oxide fuel cell includes a cell stack, a reformed gas introduction path introducing a reformed gas into the cell stack, an oxidizing agent gas introduction path introducing an oxidizing agent gas into the cell stack, and a cooling gas introduction path introducing a cooling gas into the oxidizing agent gas introduction path. A heat-absorption part absorbing heat is provided in a periphery of the cell stack, and the cooling gas introduction path is connected with the oxidizing agent gas introduction path through the heat-absorption part.
1. A solid oxide fuel cell, comprising:
a cell stack including an anode electrode and a cathode electrode and comprised of a solid electrolyte;
a reformed gas introduction path introducing a reformed gas primarily composed of hydrogen into the cell stack;
an oxidizing agent gas introduction path introducing an oxidizing agent gas, heated by a preheater, into the cell stack; and
a cooling gas introduction path bypassing the preheater and introducing the oxidizing agent gas into the oxidizing agent gas introduction path, wherein
a heat-absorption part absorbing heat is provided on a periphery of the cell stack, and
the cooling gas introduction path branches from a branch portion provided upstream of the preheater in the oxidizing agent gas introduction path, and, through the heat-absorption part, is connected with a joining portion provided downstream of the preheater in the oxidizing agent gas introduction path and upstream of the cell stack.
2. The fuel cell of claim 1 , wherein:
the periphery of the cell stack is covered by a tubular cover extending along the cell stack.
3. The fuel cell of claim 1 , wherein:
the cell stack includes a lower end supported by a support base and extends upward in a vertical direction,
introduction portions introducing the reformed gas and the oxidizing agent gas are provided in a lower end portion of the cell stack, and
the heat-absorption part is provided in a periphery of an upper portion of the cell stack.
4. The fuel cell of claim 3 , wherein:
the upper portion of the cell stack includes an uppermost layer of the upper portion and a middle layer of the upper portion located under the uppermost layer of the upper portion, and
the heat-absorption part is provided on the middle layer of the upper portion, not on the uppermost layer of the upper portion.
5. The fuel cell of claim 1 , wherein:
the heat-absorption part is comprised of a metal tube installed in a space in the periphery of the cell stack.
6. The fuel cell of claim 5 , wherein:
the metal tube is spirally provided in the periphery the cell stack.
7. The fuel cell of claim 2 , wherein:
the cell stack includes a lower end supported by a support base and extends upward in a vertical direction,
introduction portions introducing the reformed gas and the oxidizing agent gas are provided in a lower end portion of the cell stack, and
the heat-absorption part is provided in a periphery of an upper portion of the cell stack.
8. The fuel cell of claim 1 , wherein:
the heat-absorption part is comprised of a metal tube installed in a space in the periphery of the cell stack.
9. The fuel cell of claim 2 , wherein:
the heat-absorption part is comprised of a metal tube installed in a space in the periphery of the cell stack.
10. The fuel cell of claim 3 , wherein:
the heat-absorption part is comprised of a metal tube installed in a space in the periphery of the cell stack.
11. The fuel cell of claim 4 , wherein:
the heat-absorption part is comprised of a metal tube installed in a space in the periphery of the cell stack.