Arrangement and method for the utilization of waste heat

Patent metadata

Field	Value
Publication number	US-9982571-B2
Application number	US-201315024488-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Sep 25, 2013
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

The present invention relates to an arrangement ( 1 ) and method for the utilization of waste heat comprising at least a waste heat exchanger ( 3, 3′, 3 ″), at least two turbines ( 6, 6′, 6 ″}, at least two recuperators ( 7, 7′, 7 ″), and at least a cooler unit ( 8, 9, 8′, 9′, 8″, 9 ″) in at least one fluid circuit. A pump and compressor ( 10, 10′, 10 ″) in one device is comprised, switchable between a pump and compressor function by a change of the rotational frequency of a rotor of the device.

First claim

The invention claimed is:

1. A system for utilization of waste heat, the system comprising:
a waste heat exchanger;
at least three turbines comprising at least one first turbine, at least one second turbine and at least one third turbine;
at least three recuperators comprising at least one first recuperator, at least one second recuperator and at least one third recuperator;
at least one cooler unit in at least one fluid circuit; and
a pump and a compressor in one device, wherein the one device is configured to be switchable between a pump and compressor function by a change of a rotational frequency of a rotor of the one device,
wherein the system is configured to heat up a working fluid with heat from a waste heat source, the heated working fluid configured to flow through a first set of the at least one first turbine and at least one first recuperator, the heated working fluid further configured to flow downstream through the at least one second recuperator fluidically connected to the at least one second turbine via a fluid junction upstream before the at least one second recuperator, the heated fluid configured to flow downstream through the at least one third recuperator fluidically connected to the at least one third turbine via a fluid junction upstream before the at least one third recuperator,
wherein the working fluid is configured to flow downstream after the at least three recuperators through the at least one cooler unit and further downstream through the pump and compressor in the one device.

2. The system of claim 1 , wherein the at least one fluid circuit comprises exactly one waste heat exchanger.

3. The system of claim 1 , wherein the system is a regenerative supercritical CO 2 system.

4. The system of claim 1 , wherein the at least one fluid circuit comprises a closed cycle.

5. The system of claim 1 , wherein the at least three recuperators are arranged in series.

6. The system of claim 5 , wherein the at least three recuperators are arranged downstream of the at least one fluid circuit.

7. The system of claim 1 , wherein one of the at least three recuperators is arranged next to one of the at least three turbines downstream in a fluid cycle.

8. The system of claim 7 , wherein each recuperator of the at least three recuperators is arranged next to a respective turbine of the at least three turbines.

9. The system of claim 1 , wherein the at least one cooler unit comprises exactly one cooler unit.

10. The system of claim 9 , wherein the one cooler unit is provided between a last recuperator in series downstream in the at least one fluid circuit, and the one device.

11. The system of claim 1 , further comprising a bypass valve configured to fluidically bridge at least one turbine of the at least three turbines.

12. The system of claim 11 , wherein every turbine in the at least one fluid circuit is bridged by a bypass valve.

13. The system of claim 1 , wherein the at least one fluid circuit comprises more than one waste heat exchanger.

14. The system of claim 13 , wherein the at least one fluid circuit comprises two or three waste heat exchangers.

15. The system of claim 1 , wherein one turbine of the at least three turbines is mechanically connected to at least one generator.

16. The system of claim 15 , wherein every turbine of the at least three turbines is respectively mechanically connected to at least one generator.

17. A method for utilization of waste heat with at least a waste heat exchanger, the method comprising:
heating up a working fluid with heat from a waste heat source, the heated working fluid flowing through a first set of at least one first turbine and first recuperator, and flowing downstream through at least a second recuperator fluidically connected to at least a second turbine via a fluid junction upstream before the at least one second recuperator, the heated fluid flowing downstream through at least a third recuperator fluidically connected to at least a third turbine via a fluid junction upstream before the at least one third recuperator,
wherein the working fluid flows downstream after the first, second, and third recuperators through a cooler unit and further downstream through a pump and compressor in one device, the one device being switchable between the pump and compressor function by a change of a rotational frequency of a rotor of the one device.

18. The method of claim 17 , wherein the working fluid is flowing downstream after the pump and compressor in one device through the first, second, and third recuperators, and is heated up by the fluid flow coming directly from a turbine of the at least one first turbine, the second turbine, and the third turbine.

19. The method of claim 17 , wherein the working fluid is heated up in exactly one waste heat exchanger by an exhaust source.

20. The method of claim 19 , wherein the working fluid is heated up in the exactly one waste heat exchanger by heat stored in an exhaust fluid coming from the exhaust source.

21. The method of claim 17 , wherein the working fluid is heated up in more than one waste heat exchanger by an exhaust source.

22. The method of claim 21 , wherein the working fluid is heated up in the more than one waste heat exchanger by heat stored in an exhaust fluid coming from the exhaust source, the waste heat exchangers being arranged in series in an exhaust fluid stream one after another.

Assignees

• Siemens Ag

Inventors

• Malinin Vitaly
• Schuchkin Viacheslav

Classifications

• F01K3/185

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

• F01K15/00

  Adaptations of plants for special use {(F01K7/02 takes precedence)} · CPC title

• F01K23/04

  condensation heat from one cycle heating the fluid in another cycle · CPC title

• F01K25/103 Primary

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