System and method for high efficiency power generation using a carbon dioxide circulating working fluid

摘要

The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO2 circulating fluid. Fuel derived CO2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

主权项

1. A power generation system comprising:
a combustor configured for receiving a fuel, O2, and a CO2 circulating fluid stream, and having at least one combustion stage that combusts the fuel in the presence of the CO2 circulating fluid and provides a combustion product stream comprising CO2 at a pressure of at least about 8 MPa and a temperature of at least about 800° C.; a primary power production turbine in fluid communication with the combustor, the primary turbine having an inlet for receiving the combustion product stream and an outlet for release of a turbine discharge stream comprising CO2, the primary turbine being adapted to control pressure drop such that a ratio of pressures of the combustion product stream at the inlet compared to the turbine discharge stream at the outlet is less than about 12; a primary heat exchange unit in fluid communication with the primary turbine for receiving the turbine discharge stream and transferring heat therefrom to the CO2 circulating fluid stream; at least one compressor in fluid communication with the primary heat exchange unit for pressurizing the CO2 circulating fluid stream; and one or more heat transfer components in addition to the primary heat exchange unit, the one or more heat transfer components including a side heater that heats a side stream of the CO2 circulating fluid stream that is split from the CO2 circulating fluid stream in the primary heat exchange unit and then input back into the CO2 circulating fluid stream in the primary heat exchange unit upstream from the combustor, the one or more heat transfer components being configured to add heat from a source other than the turbine discharge stream.