Patent ID: 7703271

Claim:
A turbine cogeneration method, by a turbine comprising a compression section, at least first and second expansion sections, and a combustion chamber, wherein the following steps are carried out: (a) a combustion agent including oxygen is compressed in the compression section; (b) in the combustion chamber, a combustion step is carried out under pressure with a mixture of combustion agent compressed with a fuel; (c) at least some of the hot gas obtained by pressurized combustion is introduced in a first expansion section, (d) one postcombustion step comprising combustion in a first postcombustor immediately downstream, with respect to the flow of gases, of the first expansion section is carried out of a mixture of gas coming from the first expansion section with a fuel, prior to an exchange, (e) at least some of the hot gas obtained by the one postcombustion step is used to effect an heat exchanger provided immediately downstream, with respect to the flow of gases, of the first postcombustor with an external facility, (f) at least one other postcombustion step comprising combustion in a second postcombustor is carried out of a mixture of the hot gas coming from the exchange, with a fuel, in order to obtain hot gas, and (g) the hot gas from the at least one other postcombustion step is sent to a second expansion section.