Patent ID: 7513118
Filing Date: 2009-04-07
Classification: F02C,F05D,Y02E

Abstract:
1. A method for operating a gas turbine, the method comprising: drawing in air though and compressing air in the gas turbine; conducting compressed air to a combustor; combusting a syngas that is recovered from coal with said compressed air in said combustor, to produce hot gases; expanding the hot gases from said combustor in a downstream turbine as said hot gases perform work; separating a portion of said compressed air into oxygen and nitrogen; generating syngas in a coal gasifier using the oxygen from said separating; conducting a portion of said compressed air to and cooling portions of the gas turbine that are exposed to hot air with said compressed air; wherein said gas turbine comprises a reheating gas turbine which comprises two combustors and two turbines; wherein combusting a syngas comprises combusting syngas in the first combustor with the compressed air at pressures within the range of 40-65 bar; wherein expanding the hot gases from said combustor comprises expanding in the first turbine; combusting syngas in the second combustor using gases coming from the first turbine, to generate hot gases; expanding the hot gases from said second combustor in the second turbine; and wherein generating syngas comprises generating syngas suitable to be led directly to the first combustor.