| 摘要 |
A gas turbine system in which substantially all of the compressed air from the compressor portion (1) of the gas turbine is used to fluidize a bed (20) of solid fuel, such as char, in a pressurized fluidized bed gasifier (20) so as to produce a hot gas. The hot gas flows through a heat recovery steam generator (24) so as to produce steam, which is expanded in a steam turbine (26) so as to produce shaft power. A first portion of the hot gas from the heat recovery steam generator is expanded in the turbine section (36) of the gas turbine so as to produce additional shaft power. A second portion (48) of the hot gas from the heat recovery steam generator (24) is then used to cool (56, 58, 60) the turbine section (36) of the gas turbine, after further cooling and filtering. Since none of the turbine cooling fluid is obtained by bleeding compressed air directly from the compressor, the mass flow of the hot gas flowing through the gasifier, and, therefore, the hot gas it produces is maximized, thereby maximizing steam generation in the heat recovery steam generator.
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