Patent ID: 7574855

Claim:
A method for operating a gas turbine, the method comprising: drawing in and compressing air with the gas turbine; conducting compressed air to a combustion chamber; combusting a syngas that is generated from a fossil fuel with said compressed air, to generate hot gases; expanding the combustion hot gases in a downstream turbine; separating a portion of the compressed air into oxygen and nitrogen; using separated oxygen in a fossil fuel gasifier to produce the syngas; using a portion of the compressed air to cool parts of the gas turbine that are exposed to hot gases; wherein said gas turbine comprises a gas turbine with reheating including two combustors and two turbines, such that in a first of said two combustors, said syngas is combusted using the compressed air and the resultant hot gases are expanded in a first of said two turbines, and such that in a second of said two combustors, said syngas is combusted using gases from said first turbine and the resultant hot gases are expanded in a second of said two turbines; diluting, with 80-100% of the separated nitrogen, the syngas that is combusted in the second combustor; and diluting the syngas that is combusted in the first combustor with the remaining portion of the separated nitrogen.