Abstract: In a cooling device for a high temperature pipe, a high temperature pipe is efficiently cooled, and cooling performance is improved. A cooling device (10) for a high temperature pipe that cools a surface to be cooled (104) of a pipe (100) as a high temperature pipe includes: a cooling medium supply header (11) that is disposed so as not to shield heat dissipation by radiation from the surface to be cooled (104) to the periphery, and allows a cooling medium to flow out toward the surface to be cooled (104); and a cooling medium supply device (12) that supplies the cooling medium to the cooling medium supply header (11).

Abstract: The power generation system includes a fuel cell that generates electric power using a fuel gas, a gas turbine including an air compressor, a combustor, and a turbine, an exhaust fuel line that introduces an exhaust fuel gas discharged from the fuel cell into the combustor, a branch exhaust fuel line branching off midway from the exhaust fuel line, a switching unit that sends the exhaust fuel gas to one of the branch exhaust fuel line and the combustor, and a heating portion that heats the exhaust fuel line at a downstream side of the switching unit.