Cogeneration power plant and method for operating a cogeneration power plant

Patent metadata

Field	Value
Publication number	US-9726441-B2
Application number	US-201314430351-A
Country	US
Kind code	B2
Filing date	Sep 12, 2013
Priority date	Oct 1, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A cogeneration power plant and a method for operating a cogeneration power plant are provided, with a working medium being additionally cooled by a suitable heat pump between an outlet of a thermal heating device and an inlet of a power generator of the cogeneration process. The thermal power obtained in this manner is again available for heating purposes within the heat cycle.

First claim

The invention claimed is:

1. A cogeneration power plant, comprising:
a heating device comprising an inlet into which a working medium flows, and an outlet out of which the working medium flows, and configured to extract heat from the working medium;
an energy generator comprising an inlet into which the working medium flows, and an outlet out of which the working medium flows;
a heat pump; and
a circuit configured to deliver the working medium from the energy generator to the heating device, and then to split the working medium into a first flow that is delivered to the heat pump and returned to the inlet of the energy generator and a second flow that is delivered to the heat pump and returned to the inlet of the heating device;
wherein the heat pump is configured to cool the first flow of the working medium; and
wherein the heat pump is configured to heat the second flow of the working medium.

2. The cogeneration power plant as claimed in claim 1 , wherein the working medium heated by the heat pump is heated to a temperature above 70 degrees Celsius.

3. The cogeneration power plant as claimed in claim 1 , wherein a mass flow rate of the working medium which is cooled by the heat pump is smaller than a mass flow rate of the working medium which is heated by the heat pump.

4. The cogeneration power plant as claimed in claim 1 , further comprising a thermal storage unit disposed between the heating device and the heat pump in the circuit.

5. The cogeneration power plant as claimed in claim 4 , wherein the thermal storage unit comprises a phase-change medium.

6. The cogeneration power plant as claimed in claim 1 , wherein the heat pump is a high-temperature heat pump.

7. The cogeneration power plant as claimed in claim 1 , wherein the energy generator generates electrical energy.

8. The cogeneration power plant as claimed in claim 1 , wherein the heat pump is operated independently of the energy generator.

9. A method for operating a cogeneration power plant, comprising:
heating a working medium in an energy generator;
delivering the working medium from the energy generator to a heating device;
extracting heat from the working medium in the heating device;
delivering the working medium from the heating device to a heat pump via a first stream of the working medium and a second stream of the working medium;
cooling the first stream of the working medium by means of the heat pump and then returning the first stream to the energy generator;
heating the second stream of the working medium by means of the heat pump and then returning the second stream to the heating device.

10. The method as claimed in claim 9 , further comprising storing thermal energy given off by the heat pump.

11. The method as claimed in claim 9 , further comprising storing thermal energy, between the heating device and the heat pump.

12. The cogeneration power plant as claimed in claim 1 , wherein the working medium heated by the heat pump is heated to a temperature above 100 degrees Celsius.

13. The cogeneration power plant as claimed in claim 1 , wherein the working medium heated by the heat pump is heated to a temperature above 115 degrees Celsius.

14. The cogeneration power plant as claimed in claim 1 , the heat pump further comprising an evaporator configured to cool the first flow.

15. The cogeneration power plant as claimed in claim 1 , the heat pump further comprising a condenser configured to heat the second flow.

16. The method as claimed in claim 9 , further comprising using an evaporator of the heat pump to cool the first stream.

17. The method as claimed in claim 9 , further comprising using a condenser of the heat pump to heat the second stream.

Assignees

• Siemens Ag
• Siemens Aktiengesellshcaft

Inventors

• Reissner Florian
• Schafer Jochen

Classifications

• Y02P80/15

  On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply · CPC title

• Y02E20/14

  Combined heat and power generation [CHP] · CPC title

• F01K17/02

  for heating purposes, e.g. industrial, domestic (F01K17/06 takes precedence; domestic- or space-heating systems, e.g. central-heating systems, in general F24D1/00, F24D3/00, F24D9/00) · CPC title

• F01K17/005

  by means of a heat pump (heat pumps systems per se F25B) · CPC title

• G05B15/02

  electric · CPC title