Systems and methods for generating power using carbon dioxide working fluid

Abstract

To provide systems and methods for power production using a carbon dioxide working fluid.SOLUTION: A power production system comprises: a combustor 302; a turbine 303 in fluid connection with the combustor 302; a generator 304 in power-generating connection with the turbine 303; a heat exchanger 300 in fluid connection with the turbine 303; at least one unit arranged to receive a stream from the heat exchanger 300 and arranged to output a CO2-containing recycled stream; at least one pump 329, 367 configured to increase the pressure of a first portion 366 of the CO2-containing recycled stream and optionally a second portion 338 of the CO2-containing recycled stream; and a bypass compressor 336 arranged such that the second portion 338 of the CO2-containing recycled stream is configured to bypass at least a portion of the heat exchanger 300.SELECTED DRAWING: Figure 3

Claims

1. 1. A method for increasing available heat in a recycle stream in an electric power generation system, the method comprising: expanding the combustion stream from a higher pressure to a lower pressure in a turbine to generate power and form a turbine exhaust stream; cooling the turbine exhaust stream in a heat exchanger operating over a range of different temperatures to form a cooled turbine exhaust stream; CO available as the first and second portions. ２ treating the cooled turbine exhaust stream to provide a recycle stream comprising: The CO ２ a first portion of a recycle stream comprising said CO ２ pumping a second portion of the recycle stream comprising: To increase its temperature, the CO ２ passing a first portion of a recycle stream comprising: The CO ２ increasing the pressure and temperature of a second portion of the recycle stream comprising said CO ２ in the compressor to form a bypass portion of a recycle stream comprising ２ processing a second portion of the recycle stream comprising: The CO ２ delivering a first portion of the recycle stream to the combustor; To form the combustion stream, ２ combusting an oxidant and a fuel in the combustor with a first portion of a recycle stream comprising: The CO ２ and a bypass portion of the recycle stream comprising ２ delivering a bypass portion of a recycle stream to said combustor, said bypass portion comprising: A method comprising:

2. CO obtained from the cooled turbine exhaust stream ２ The method of claim 1 , wherein the recycle stream comprising:

3. The method of claim 1 , wherein the heat exchanger operating over a range of different temperatures comprises a plurality of sections.

4. The method of claim 3 , wherein the heat exchanger operating over a range of different temperatures comprises a first section, a second section, and a third section.

5. The CO ２ 5. The method of claim 4, wherein a bypass portion of the recycle stream comprising: bypasses the second section of the heat exchanger and is heated in the first and third sections of the heat exchanger.

6. The CO ２ 4. The method of claim 3, wherein a bypass portion of the recycle stream comprising:

7. The method of claim 3 , wherein the multiple sections of the heat exchanger are multiple individual heat exchangers.

8. The CO ２ 2. The method of claim 1 , wherein a bypass portion of the recycle stream comprising:

9. The CO ２ The bypass portion of the recycle stream comprising said CO ２ after a first portion of the recycle stream comprising ２ 2. The method of claim 1 , wherein the first portion of the recycle stream comprises a first portion of the heat exchanger.

10. The CO ２ A first portion of the recycle stream comprising said CO ２ to form a third portion of a recycle stream comprising said CO ２ The method of claim 1 , wherein a third portion of the recycle stream comprising:

11. The CO ２ A second portion of the recycle stream comprising said CO ２ and providing a second portion of the recycle stream comprising said CO ２ The method of claim 1 , wherein a second portion of the recycle stream comprising:

12. The CO ２ After the second portion of the recycle stream comprising ２ before a second portion of the recycle stream comprising ２ The method of claim 1 , wherein a second portion of the recycle stream comprising:

13. below: the combustion stream being at a temperature of between 700°C and 1,600°C; said turbine exhaust stream being at a pressure between 1 bar and 50 bar; treating the cooled turbine exhaust stream comprises separating water from the cooled turbine exhaust stream; The CO ２ said first portion of said recycle stream being pumped to a pressure between 100 bar and 500 bar; The CO ２ a second portion of the recycle stream comprising: The CO ２ treating the second portion of the recycle stream comprising increasing the pressure to between 200 bar and 500 bar. The method of claim 1 , wherein one or more of the following conditions are met:

14. To form an oxidant stream, an oxygen stream from an air separation plant is added to the CO ２ a first portion of a recycle stream comprising said CO ２ 10. The method of claim 1, further comprising mixing with one of the second portions of the recycle stream comprising:

15. The CO ２ 2. The method of claim 1, wherein the compressor processing the second portion of the recycle stream comprising:

16. 1. A power generation system comprising: a combustor having one or more inlets configured to receive a plurality of flows, the combustor also having an outlet for a combustor exhaust formed in the combustor; a turbine having an inlet in fluid communication with an outlet of the combustor and having an outlet; a generator configured for producing electrical power and in generating communication with the turbine; a heat exchanger with a plurality of inlets and outlets, the heat exchanger configured for operation over a range of different temperatures, the heat exchanger having an inlet and an outlet in fluid communication with the turbine; arranged to receive a flow from the heat exchanger and ２ at least one unit arranged to output a recycle stream comprising: At least the CO ２ and receiving a first portion of a recycle stream comprising at least said CO ２ a first pump configured to increase the pressure of a first portion of a recycle stream comprising: The CO ２ and an inlet arranged to receive a second portion of the recycle stream comprising the CO ２ a bypass compressor having an outlet arranged such that a second portion of the recycle stream comprising at least one line arranged for introduction of at least a portion of the recycle stream comprising said CO2 into said combustor; A power generating system comprising:

17. The power generation system of claim 16 , wherein the heat exchanger comprises multiple sections.

18. 20. The power generation system of claim 17, wherein the multiple sections are multiple individual heat exchangers.

19. The power generation system of claim 16, further comprising a second pump configured to receive a portion of the second portion of the recycled stream comprising CO2 and increase the pressure of the portion of the second portion of the recycled stream comprising CO2, the second pump having an outlet fluidly connected to an inlet of the heat exchanger.

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