| 摘要 |
A gas turbine power plant having a pressurized fluidized bed combustor and an external topping combustor. A cylindrical duct and a toroidal duct direct the flow of hot gas from the topping combustor and distribute it around the circumference of the turbine inlet. The walls of the duct are cooled by water or steam. The walls are formed by tubes, having cooling fluid passages formed therein, that extend between inlet and outlet manifolds. Elongated plate sections connect each tube to an adjacent tube so as to form a continuous gas barrier. If the walls are water cooled, the water that flows through the tubes for cooling is subsequently directed to a heat recovery steam generator, in which it is converted to steam for expansion in a steam turbine. If the walls are steam cooled, the steam is first generated in the heat recovery steam generator and then at least partially superheated by flowing through the walls.
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