Systems and methods for power production using nested CO
The present disclosure relates to systems and methods useful for power production. In particular, a power production cycle utilizing CO 2 as a working fluid may be combined with a second cycle wherein a compressed CO 2 stream from the power production cycle can be heated and expanded to produce additional power and to provide additional heating to the power production cycle.
1. A power production method comprising:
operating a first power production cycle wherein a recycled CO 2 stream is subjected to repeated compression, heating, combustion, expansion for power production, and cooling; and
operating a second power production cycle wherein compressed recycled CO 2 from the first power production cycle is heated with a heat source that is independent of the first power production cycle, expanded for power production, and recombined with the recycled CO 2 stream in the first power production cycle.
2. The power production method of claim 1 , wherein the heating in the first power production cycle includes receiving heat provided to the recycled CO 2 in the second power production cycle.
3. The power production method of claim 1 , wherein the heat source in the second power production cycle is one or more of a combustion heat source, a solar heat source, a nuclear heat source, a geothermal heat source, and an industrial waste heat source.