Fuel cell power generation system including an off-gas heating heat exchanger used to heat anode stream off-gas containing hydrogen

A fuel cell power generation system includes a reforming catalyst body configured to generate a reformed gas containing hydrogen from a feed gas and water, a fuel cell configured to generate electric power by consuming the reformed gas, and a burner configured to combust an off gas containing hydrogen from the fuel cell as a fuel gas to generate the combustion gas used for heating the reforming catalyst body. The off gas from which steam has been separated is heated, and the heated off gas is fed to the burner as the fuel gas, the separated steam being condensed into water which is discharged outside the system.