Low emission triple-cycle power generation systems and methods

摘要

Methods and systems for low emission power generation in hydrocarbon recovery processes are provided. One system includes a gas turbine system adapted to combust a fuel and an oxidant in the presence of a compressed recycle stream to provide mechanical power and a gaseous exhaust. The compressed recycle stream acts to moderate the temperature of the combustion process. A boost compressor can boost the pressure of the gaseous exhaust before being compressed into the compressed recycle stream. A purge stream may be tapped off from the compressed recycle stream and directed to a C02 separator which discharges C02 and a nitrogen-rich gas, which may be expanded in a gas expander to generate additional mechanical power.