Method for preheating feed water in steam power plants, with process steam outcoupling

Patent metadata

Field	Value
Publication number	US-9890948-B2
Application number	US-201314898140-A
Country	US
Kind code	B2
Filing date	Oct 18, 2013
Priority date	Jul 5, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A system for supplying feed water for an evaporator in a water-steam circuit has a condenser for condensing steam to obtain water that can be supplied with steam from a turbine installation. A degasification device for degasing condensate is coupled to the condenser such that a first portion of the condensate of the condenser can be fed to the degasification device. The heat exchanger is coupled to the condenser such that a second portion of the condensate of the condenser can be fed to the heat exchanger, the heat exchanger being coupled to a supply line such that feed water can be fed to the heat exchanger. The heat exchanger is configured such that the feed water can be heated using the second portion of the condensate. The heat exchanger is coupled to the degasification device such that the heated feed water can be fed to the degasification device.

First claim

The invention claimed is:

1. A system for feeding makeup water for an evaporator of a water steam circuit, the system comprising:
a condenser for condensing steam to form condensate,
wherein the condenser is adapted to be supplied with steam from a turbine system,
a degasification device for degasifying the condensate,
wherein the degasification device is coupled to the condenser in such a way that a first portion of the condensate is adapted to be fed to the degasification device,
a feed line for feeding in the makeup water,
a heat exchanger,
wherein the heat exchanger is coupled to the condenser in such a way that a second portion of the condensate of the condenser is adapted to be fed to the heat exchanger,
wherein the heat exchanger is coupled to the feed line in such a way that the makeup water is adapted to be fed to the heat exchanger,
wherein the heat exchanger is configured in such a way that the makeup water is adapted to be heated by means of the second portion of the condensate of the condenser, and
wherein the heat exchanger is coupled to the degasification device in such a way that heated makeup water is adapted to be fed to the degasification device, and
a heating device for heating the condensate of the condenser,
wherein the heating device is coupled to the condenser in such a way that the condensate of the condenser is adapted to be fed to the heating device, and
wherein the heating device is coupled to the degasification device in such a way that heated condensate is adapted to be fed to the degasification device.

2. The system as claimed in claim 1 ,
wherein the heat exchanger is coupled to the degasification device in such a way that the second portion of the condensate of the condenser is adapted to be fed to the degasification device after passing through the heat exchanger.

3. The system as claimed in claim 1 ,
wherein the heat exchanger is coupled to the condenser in such a way that the second portion of the condensate of the condenser is adapted to be fed to the condenser after passing through the heat exchanger.

4. The system as claimed in claim 1 ,
wherein the heating device is configured in such a way that the heating device for heating the condensate of the condenser is adapted to be supplied with steam from the turbine system.

5. The system as claimed in claim 4 ,
wherein the heating device for heating the condensate of the condenser is adapted to be supplied with steam from a medium pressure range and/or low pressure range of the turbine system.

6. The system as claimed in claim 1 ,
wherein the heating device is coupled between the condenser and the heat exchanger in such a way that the second portion of the condensate is adapted to be tapped after the heating of the condensate of the condenser in the heating device and is adapted to be fed to the heat exchanger.

7. The system as claimed in claim 1 ,
wherein the degasification device is configured in such a way that, in order to degasify the water, the degasification device is adapted to be supplied with steam from the turbine system.

8. The system as claimed in 7 ,
wherein the degasification device is adapted to be supplied with steam from a medium pressure range and/or low pressure range of the turbine system.

9. The system as claimed in claim 1 , further comprising
a condensate pump,
wherein, in order to increase a pressure of the condensate of the condenser, the condensate pump is arranged between the condenser and the degasification device.

10. A method for degasifying makeup water for an evaporator of a water steam circuit, the method comprising
condensing a steam to form condensate by means of a condenser,
wherein the condenser is supplied with steam from a turbine system,
degasifying the condensate by means of a degasification device,
wherein the degasification device is coupled to the condenser in such a way that a first portion of the condensate of the condenser is adapted to be fed to the degasification device,
heating the condensate between the condenser and the degasification device via a heating device,
feeding a second portion of the condensate of the condenser to a heat exchanger,
feeding makeup water from a feed line to the heat exchanger,
heating the makeup water by means of the second portion of the condensate of the condenser in the heat exchanger, and
feeding heated makeup condensate from the heat exchanger to the degasification device.

11. A system for feeding makeup water to a water steam circuit, the system comprising:
a water steam circuit, a turbine system, a condenser, a degasification device, a heat exchanger, and a makeup feedwater feed line,
wherein the water steam circuit is configured to flow a working fluid through the turbine system, then to the condenser, then to the degasification unit, and back to the turbine system,
wherein the condenser is configured to receive the working fluid as steam and to condense the steam to form a main flow of condensate,
wherein the water steam circuit is configured to deliver a first portion of the main flow of condensate from a location where the main flow of condensate is flowing from the condenser toward the degasification unit and to deliver the first portion to the degasification unit,
wherein the water steam circuit is configured to deliver a second portion of the main flow of condensate from the location and to deliver the second portion to the heat exchanger,
wherein the heat exchanger is configured to receive makeup water from the makeup water feed line, heat the makeup water via a heat exchange process with the second portion of the main flow of condensate, and deliver heated makeup water directly to the degasification unit.

12. The system as claimed in claim 11 , wherein the water steam circuit is configured to deliver the second portion from the heat exchanger to the degasification device.

13. The system as claimed in claim 11 , wherein the water steam circuit is configured to deliver the second portion from the heat exchanger to the condenser.

14. The system as claimed in claim 11 , further comprising:
a heating device disposed between the condenser and the degasification unit and configured to heat the main flow of condensate.

15. The system as claimed in claim 14 , wherein the water steam circuit is configured to supply steam from the turbine system to the heating device.

16. The system as claimed in claim 14 , wherein the heating device is disposed between the condenser and the location.

17. The system as claimed in claim 11 , further comprising
a condensate pump disposed between the condenser and the degasification device.

Assignees

• Siemens Ag

Inventors

• Assmann Ingo
• Neuberg Tim

Classifications

• F22D1/50

  incorporating thermal de-aeration of feed-water (de-aeration produced in the course of direct heat transfer F22D1/28) · CPC title

• F28B9/00

  Auxiliary systems, arrangements, or devices · CPC title

• F01K7/44

  Use of steam for feed-water heating and another purpose · CPC title

• F01K7/40

  Use of two or more feed-water heaters in series · CPC title

• F01K9/00

  Plants characterised by condensers arranged or modified to co-operate with the engines (by condensers structurally combined with engines F01K11/00; steam condensers per se F28B)(F01K23/04 takes precedence) · CPC title