Patent ID: 7584599

Claim:
A method for the operation of a gas turbine, wherein the gas turbine comprises a first compressor for compressing drawn in air to a first stage of pressure and a second compressor for further compressing air from the first pressure stage to a second, higher pressure stage, the method comprising: drawing in air and compressing said air with said first and second compressors of the gas turbine; conducting the compressed air to a combustor; combusting said compressed air with a syngas in said combustor, said syngas recovered from coal, to generate hot gases; expanding the hot gases from the combustion in a downstream turbine as said hot gases do work; separating a portion of the compressed air from the first compressor into oxygen and nitrogen; using the oxygen in a coal gasifying plant to generate said syngas; cooling portions of the gas turbine that are exposed to hot gases with a portion of the compressed air; wherein said gas turbine comprises a reheating gas turbine including a first combustor, a second combustor, a first turbine, and a second turbine; wherein combusting comprises combusting said syngas in the first combustor with the compressed air; wherein expanding the hot gases comprises expanding in the first turbine; combusting syngas in the second combustor with gases from the first turbine; expanding hot gases from the second combustor in the second turbine; and conducting the nitrogen from said separating to, and compressing said nitrogen in, said gas turbine.