SPLIT-FLOW RECIRCULATING GAS TURBINE

摘要

The invention relates to combined cycle power plants having a novel process control which integrates the elimination of CO2 into the power plant process in an optimized manner, and to a method for operating such a power plant. The core of the invention is a combined cycle power plant process with integrated exhaust gas recirculation and CO2 elimination. According to the novel process, the hot gas flow is split into a recirculation flow (12) and an exhaust gas flow in the turbine upstream of the last turbine stage. A first partial flow remains in the turbine and does conventional expansion work before its waste heat is carried off for example to a waste heat boiler, and the gases are recirculated to the intake flow of the gas turbine. A second partial flow is branched off upstream of the last turbine stage and gives off its waste heat in a HRSG / heat exchanger (4) before CO2 is removed from the exhaust gas flow at increased pressure.