Method for expanding flue gas flow in a turbine and the turbine

摘要

A method of expanding a hot flue-gas flow in a turbine through which a hot flue-gas passes. A structural component of the turbine is cooled by a cooling-gas flow which flows through the structural component and is fed to the hot flue-gas flow. Fuel is added in a metered fashion to the flue-gas flow in the turbine in such a way that a temperature drop in the flue-gas flow, which temperature drop results from the feeding of the cooling-gas flow without a metered addition of the fuel, is largely compensated for by the combustion of the fuel added in a metered fashion to the hot flue-gas flow. A corresponding turbine is also taught.