Supercritical CO2 generation system

Patent metadata

Field	Value
Publication number	US-9926814-B2
Application number	US-201615002633-A
Country	US
Kind code	B2
Filing date	Jan 21, 2016
Priority date	May 4, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A supercritical CO2 generation system including a compressor configured to compress a working fluid; a first heat exchanger that exchanges heat with the working fluid passing through the compressor; a high temperature turbine that expands the working fluid passing through the first heat exchanger and connects to a power generator to produce power; a second heat exchanger that exchanges heat with the working fluid passing through the compressor; a low temperature turbine that expand the working fluid passing through the second heat exchanger and connects to the power generator to produce power; a third heat exchanger between the first heat exchanger and the high temperature turbine that exchanges heat with the working fluid recuperated by the first heat exchanger; and a cooler that cools the working fluid passing through the high temperature turbine and the low temperature turbine and supplies the cooled working fluid to the compressor.

First claim

What is claimed is:

1. A supercritical CO2 generation system, comprising:
a compressor configured to compress a working fluid;
a first heat exchanger configured to exchange heat with the working fluid passing through the compressor;
a high temperature turbine configured to expand the working fluid passing through the first heat exchanger and to be connected to a power generator to produce power;
a second heat exchanger configured to exchange heat with the working fluid passing through the compressor;
a low temperature turbine configured to expand the working fluid passing through the second heat exchanger and to be connected to the power generator to produce power, wherein a temperature of the high temperature turbine is higher than a temperature of the low temperature turbine;
a third heat exchanger configured to be provided between the first heat exchanger and the high temperature turbine to exchange heat with the working fluid recuperated by the first heat exchanger; and
a cooler configured to cool the working fluid passing through the high temperature turbine and the low temperature turbine and supply the cooled working fluid to the compressor,
wherein the first heat exchanger is configured to exchange heat between first working fluid output from the low temperature turbine and second working fluid output from the cooler.

2. The supercritical CO2 generation system of claim 1 , wherein a flow of the working fluid is divided into a first flow and a second flow at a rear portion of the compressor and the first flow is introduced from the compressor into the first heat exchanger.

3. The supercritical CO2 generation system of claim 2 , wherein the second heat exchanger is recuperated by being introduced with the second flow of the working fluid.

4. The supercritical CO2 generation system of claim 3 , wherein when the working fluid is supplied from the second heat exchanger, the low temperature turbine transfers a driving force to the power generator and when the working fluid is not supplied from the second heat exchanger, the low temperature turbine does not transfer the driving force to the power generator.

5. The supercritical CO2 generation system of claim 4 , wherein one of the high temperature turbine or the low temperature turbine is formed on a hollow shaft and the other one thereof is formed on a shaft which is inserted into the hollow shaft.

6. The supercritical CO2 generation system of claim 4 , wherein a shaft of the high temperature turbine is connected to one side of the power generator to transfer a driving force to the power generator and a shaft of the low temperature turbine is connected to the one side of the power generator to transfer the driving force to the power generator.

7. The supercritical CO2 generation system of claim 6 , wherein the first heat exchanger and the second heat exchanger each function as a recuperator for recuperating the working fluid.

8. The supercritical CO2 generation system of claim 7 , wherein the third heat exchanger delivers waste heat recovered from an external heat source to the working fluid.

9. The supercritical CO2 generation system of claim 8 , wherein the working fluid passing through the high temperature turbine is delivered to the cooler through the second heat exchanger and the working fluid of the second flow is recuperated by receiving heat from the working fluid passing through the second heat exchanger.

10. The supercritical CO2 generation system of claim 8 , wherein the working fluid passing through the low temperature turbine is delivered to the cooler through the first heat exchanger and the working fluid of the first flow is recuperated by receiving heat from the working fluid passing through the first heat exchanger.

11. The supercritical CO2 generation system of claim 3 , wherein the flow of the working fluid further includes a third flow divided at the rear portion of the compressor.

12. The supercritical CO2 generation system of claim 11 , further comprising:
a fourth heat exchanger configured to be recuperated by being introduced with the third flow of the working fluid; and
a medium temperature turbine configured to be connected to the power generator to produce power,
wherein the working fluid passing through the fourth heat exchanger is delivered to the medium temperature turbine, wherein a temperature of the medium temperature turbine is between the temperature of the high temperature turbine and the temperature of the low temperature turbine.

13. The supercritical CO2 generation system of claim 12 , wherein the working fluid passing through the high temperature turbine is delivered to the cooler through the second heat exchanger and the working fluid of the second flow is recuperated by receiving heat from the working fluid passing through the second heat exchanger.

14. The supercritical CO2 generation system of claim 12 , wherein the working fluid passing through the low temperature turbine is delivered to the cooler through the first heat exchanger and the working fluid of the first flow is recuperated by receiving heat from the working fluid passing through the first heat exchanger.

15. The supercritical CO2 generation system of claim 12 , wherein the working fluid passing through the medium temperature turbine is delivered to the cooler through the third heat exchanger and the working fluid of the third flow is recuperated by receiving heat from the working fluid passing through the fourth heat exchanger.

16. A supercritical CO2 generation system, comprising:
a compressor configured to compress a working fluid;
a first heat exchanger configured to exchange heat with the working fluid of a first flow distributed at a rear portion of the compressor;
a high temperature turbine configured to expand the working fluid passing through the first heat exchanger and to be connected to a power generator to produce power;
a second heat exchanger configured to exchange heat with the working fluid of a second flow distributed at the rear portion of the compressor;
a low temperature turbine configured to expand the working fluid passing through the second heat exchanger and to be connected to the power generator to produce power, wherein a temperature of the high temperature turbine is higher than a temperature of the low temperature turbine; and
a cooler configured to cool the working fluid passing through the high temperature turbine and the low temperature turbine and supply the cooled working fluid to the compressor,
wherein the first heat exchanger is configured to exchange heat between first working fluid output from the low temperature turbine and second working fluid output from the cooler.

17. The supercritical CO2 generation system of claim 16 , wherein a flow of the working fluid is divided into a first flow and a second flow at the rear portion of the compressor and the first flow is introduced from the compressor into the first heat exchanger,
the second heat exchanger is recuperated by being introduced with the second flow of the working fluid,
when the working fluid is supplied from the second heat exchanger, the low temperature turbine transfers a driving force to the power generator and when the working fluid is not supplied from the second heat exchanger, the low temperature turbine does not transfer the driving force to the power generator, and
one of the high temperature turbine or the low temperature turbine is formed on a hollow shaft and the other one thereof is formed on a shaft which is inserted into the hollow shaft.

18. The supercritical CO2 generat

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Roh Chul Woo
• Kang Sung Gju
• Hwang Jeong Ho

Classifications

• F01K25/103 Primary

  Carbon dioxide (F01K25/065 takes precedence) · CPC title

• F02C1/08

  Semi-closed cycles · CPC title

• F01K7/32

  the engines using steam of critical or overcritical pressure · CPC title

• F02C1/04

  the working fluid being heated indirectly {(in a fluidised-bed combustor F02C3/205)} · CPC title