Arrangement and method utilizing waste heat

Patent metadata

Field	Value
Publication number	US-10030546-B2
Application number	US-201315024992-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Sep 25, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A method and arrangement for utilizing waste heat that includes a waste heat exchanger, at least two turbines, at least two recuperators, at least two cooler units, and at least two pumps and/or compressors as components, wherein all components are arranged in a single fluid cycle, where the waste heat exchanger heats up a fluid with heat from a waste heat source, the heated fluid flows through a first set of the at least one turbine, the at least one recuperator, the at least one cooler unit, and the at least one pump and/or compressor, and then flows through at least a second set the at least one turbine, the at least one recuperator, the at least one cooler unit, and the at least one pump and/or compressor with the same components arranged in series downstream of the first set.

First claim

The invention claimed is:

1. An arrangement for utilizing waste heat comprising:
a waste heat exchanger;
at least two turbines;
at least two recuperators;
at least two cooler units;
at least two devices comprising at least one of (i) pumps and (ii) compressors; and
a bypass valve directly connected to the waste heat exchanger, the at least two recuperators and a turbine of the at least two turbines;
wherein all components of the arrangement are arranged in a single fluid cycle.

2. The arrangement according to claim 1 , wherein the single fluid cycle comprises a closed fluid circuit.

3. The arrangement according to claim 1 , wherein a respective turbine of the at least two turbines is respectively mechanically connected to at least one generator.

4. The arrangement according to claim 1 , wherein the arrangement comprises a regenerative supercritical CO 2 system.

5. The arrangement according to claim 4 , wherein the regenerative supercritical CO 2 system includes CO 2 as a working fluid within the single fluid cycle.

6. The arrangement according to claim 4 , wherein the single fluid cycle comprises at least two open sub-cycles, respectively with one turbine of the at least two turbines, one recuperator of the at least two recuperators, one cooler unit of the at least two cooler units, and one of the pump and the compressor of the at least two devices comprising at least one of (i) pumps and (ii) compressors, all components of the arrangement being arranged in series.

7. The arrangement according to claim 6 , further comprising:
a bypass comprising a sub-cycle at every sub-cycle of the at least two open sub-cycles for optimal adjustment of mass flow within a sub-cycle.

8. The arrangement according to claim 6 , further comprising:
a further bypass valve directly fluidically connecting an inflow of a sub-cycle of the at least two open sub-cycles with an inflow of the waste heat exchanger.

9. The arrangement according to claim 1 , wherein the single fluid cycle comprises at least two open sub-cycles, respectively with one turbine of the at least two turbines, one recuperator of the at least two recuperators, one cooler unit of the at least two cooler units, and one of the pump and the compressor of the at least two devices comprising at least one of (i) pumps and (ii) compressors, all components of the arrangement being arranged in series.

10. The arrangement according to claim 9 , further comprising:
a bypass comprising a sub-cycle at every sub-cycle of the at least two open sub-cycles for optimal adjustment of mass flow within a sub-cycle.

11. The arrangement according to claim 9 , further comprising:
a further bypass valve directly fluidically connecting an inflow of a sub-cycle of the at least two open sub-cycles with an inflow of the waste heat exchanger.

12. The arrangement according to claim 9 , wherein the at least two open sub-cycles respectively comprise a regenerative supercritical CO 2 cycle for utilizing the waste heat.

13. The arrangement according to claim 12 , further comprising:
a further bypass valve directly fluidically connecting an inflow of a sub-cycle of the at least two open sub-cycles with an inflow of the waste heat exchanger.

14. A method for utilizing waste heat, the method comprising:
heating up, by a waste heat exchanger, a fluid with heat from a waste heat source;
flowing the heated fluid through a first set of at least one turbine, at least one recuperator, at least one cooler unit, and at least one of (i) at least one pump and (ii) at least one compressor, a bypass valve being directly connected between the waste heat exchanger and the at least one turbine; and
flowing the heated fluid through at least a second set of at least one turbine, at least one recuperator, at least one cooler unit, and at least one of the (i) at least one pump and (ii) at least one compressor, arranged in series downstream of the first set of the at least one turbine, the at least one recuperator, the at least one cooler unit, and at least one of the (i) at least one pump and (ii) at least one compressor.

15. The method according to claim 14 , wherein the flow of fluid through the second set downstream the first set is at least one of controlled and regulated by a bypass valve which fluidically connects an inflow of the second set downstream the first set and an inflow of the waste heat exchanger such that no fluid passes the second set downstream the first set.

16. The method according to claim 14 , wherein a bypass fluidically connects an output of at least one of the (i) at least one pump and (ii) compressor of the first set with at least one of (A) the output of at least one of the (a) at least one pump and (ii) compressor of the second set and (B) an inflow of the waste heat exchanger, such that all outputs of one of the pumps and compressors are fluidically connected with an inflow of the waste heat exchanger.

17. The method according to any claim 14 , wherein fluid heated by the waste heat exchanger flows in a closed fluid circuit through all fluidically connected components of the arrangement in series, except part of fluid flowing through a bypass.

18. The method according to claim 14 , wherein one of:
the fluid comprises CO 2 in a supercritical state and is heated in the waste heat exchanger from a first temperature to a second temperature, transported to the at least one turbine of the first set and cooled down to a third temperature such that heat is partially converted into at least one of (i) mechanical energy and (ii) electrical energy, transported to the at least one turbine of the at least second set after being heated in the at least one recuperator, and further cooled down to a fourth temperature such that heat is partially converted into at least one of (i) mechanical energy and (ii) electrical energy, and
the fluid flows through a bypass of the second set.

19. The method according to claim 14 , wherein the fluid flows through the first set with the same flow stream as through the at least second set.

20. The method according to claim 19 , wherein the flow of fluid through the second set downstream the first set is at least one of controlled and regulated by a bypass valve which fluidically connects an inflow of the second set downstream the first set and an inflow of the waste heat exchanger such that no fluid passes the second set downstream the first set.

21. The method according to claim 14 , wherein the fluid flows through the first set with the same flow stream as through the at least second set plus fluid flowing through a bypass.

22. The method according to claim 21 , wherein the flow of fluid through the second set downstream the first set is at least one of controlled and regulated by a bypass valve which fluidically connects an inflow of the second set downstream the first set and an inflow of the waste heat exchanger such that no fluid passes the second set downstream the first set.

Assignees

• Siemens Ag

Inventors

• Malinin Vitaly
• Schuchkin Viacheslav

Classifications

• H02K7/1823

  structurally associated with turbines or similar engines · CPC title

• F01K25/103 Primary

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

• F01D15/10

  Adaptations for driving, or combinations with, electric generators · CPC title

• F01K3/185

  using waste heat from outside the plant (F02G5/00 takes precedence) · CPC title