METHOD AND SYSTEM FOR POWER PRODUCTION WTIH IMPROVED EFFICIENCY

摘要

The present disclosure relates to systems and methods that provide power generation using predominantly CO2 as a working fluid. In particular, the present disclosure provides for the use of a portion of the heat of compression from a CO2 compressor as the additive heating necessary to increase the overall efficiency of a power production system and method.

主权项

1. A method for heating a recirculating gas stream comprising:
passing a gas stream G at a pressure P1 and a temperature T1 through a recuperative heat exchanger such that the gas stream is cooled to a temperature T2 that is less than T1; separating the gas stream G into a first fraction G1 and a second fraction G2; compressing the gas stream fraction G1 to a pressure P2 that is greater than P1; compressing the gas stream fraction G2 to a pressure P3 that is greater than P1 so as to heat the gas stream fraction G2 to a temperature T3 that is greater than T2; withdrawing the heat from the compressed gas stream fraction G2; combining the gas stream fraction G1 and the gas stream fraction G2 to form a combined recirculating gas stream GC; pumping the recirculating gas stream GC to a pressure P4 that is greater than P2 and greater than P3; and passing the recirculating gas stream GC to the recuperative heat exchanger such that the gas stream GC is heated by the cooling gas stream G; wherein the heat withdrawn from the compressed gas stream fraction G2 is added to the recirculating gas stream GC after pumping to pressure P4.