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To generate mechanical energy and electrical energy efficiently, by combining a Stirling engine and a fuel cell. A solid electrolyte type fuel cell FC is disposed between an air passage for supplying air to a heater of a Stirling engine E and a fuel passage for supplying fuel. Air and the fuel react

To generate mechanical energy and electrical energy efficiently, by combining a Stirling engine and a fuel cell. A solid electrolyte type fuel cell FC is disposed between an air passage for supplying air to a heater of a Stirling engine E and a fuel passage for supplying fuel. Air and the fuel react with each other in the solid electrolyte type fuel cell FC to generate electrical energy, an off gas containing the unreacted fuel discharged from the solid electrolyte type fuel cell FC is supplied to the heater of the Stirling engine E and subjected to catalytic combustion. The resulting heat is used to operate the Stirling engine E to generate mechanical energy. The solid electrolyte type fuel cell FC is arranged in an annular-shape and so disposed as to surround the heater. The heat of reaction generated in the solid electrolyte type fuel cell FC acts on the heater, thereby contributing to elevation of the temperature of the heater.

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1. A compound-type energy generation system comprising: a Stirling engine (E); and a fuel cell (FC); wherein an unreacted gas discharged from said fuel cell (FC) is combusted in a heater of said Stirling engine (E). 2. The compound-type energy generation system according to claim 1, wherein

1. A compound-type energy generation system comprising: a Stirling engine (E); and a fuel cell (FC); wherein an unreacted gas discharged from said fuel cell (FC) is combusted in a heater of said Stirling engine (E). 2. The compound-type energy generation system according to claim 1, wherein the combustion of said unreacted gas is catalytic combustion.3. The compound-type energy generation system according to claim 1, wherein the periphery of said heater of said Stirling engine (E) is surrounded by said fuel cell (FC) which is an annular-shape.4. The compound-type energy generation system according to claim 2, wherein the periphery of said heater of said Stirling engine (E) is surrounded by said fuel cell (FC) which is an annular-shape.5. The compound-type energy generation system according to claim 1, wherein said fuel cell (FC) is a solid electrolyte type fuel cell.6. The compound-type energy generation system according to claim 2, wherein said fuel cell (FC) is a solid electrolyte type fuel cell.7. The compound-type energy generation system according to claim 3, wherein said fuel cell (FC) is a solid electrolyte type fuel cell.8. The compound-type energy generation system according to claim 4, wherein said fuel cell (FC) is a solid electrolyte type fuel cell.9. The compound-type energy generation system according to claim 1, wherein a Seebeck device is disposed in an exhaust passage of said heater of said Stirling engine (E).10. The compound-type energy generation system according to claim 2, wherein a Seebeck device is disposed in an exhaust passage of said heater of said Stirling engine (E).11. The compound-type energy generation system according to claim 3, wherein a Seebeck device is disposed in an exhaust passage of said heater of said Stirling engine (E).12. The compound-type energy generation system according to claim 4, wherein a Seebeck device is disposed in an exhaust passage of said heater of said Stirling engine (E).13. The compound-type energy generation system according to claim 5, wherein a Seebeck device is disposed in an exhaust passage of said heater of said Stirling engine (E).14. A compound-type energy generation system comprising: a Stirling engine (E) including a heater with a displacer device operatively positioned therein, said displacer device being connected to a power cylinder; and a fuel cell (FC) operatively mounted relative to said Stirling engine, said fuel cell including an air pole disposed to an air passage a fuel cell disposed to a fuel passage, wherein O 2and N2flow through the air passage and HC and CO flow through the fuel passage to react to form an electromotive force; wherein an unreacted gas discharged from said fuel cell (FC) is combusted in the heater of said Stirling engine (E). 15. The compound-type energy generation system according to claim 14, wherein the combustion of said unreacted gas is catalytic combustion.16. The compound-type energy generation system according to claim 14, wherein the periphery of said heater of said Stirling engine (E) is surrounded by said fuel cell (FC) which is an annular-shape.17. The compound-type energy generation system according to claim 14, wherein said fuel cell (FC) is a solid electrolyte type fuel cell.18. The compound-type energy generation system according to claim 14, wherein a Seebeck device is operatively disposed in an exhaust passage of said heater of said Stirling engine (E).