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

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.

Claims

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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the text which follows, exemplary embodiments will be described in more detail with reference to the appended figures for the sake of further explanation and for better understanding of the present invention.

(2) FIG. 1 shows a schematic illustration of a system for feeding makeup water into a water-steam circuit of a steam power plant according to an exemplary embodiment of the present invention, and

(3) FIG. 2 shows a conventional system for feeding makeup water into a water-steam circuit of a steam power plant.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

(4) Identical or similar components are provided with identical reference symbols in the figures. The illustrations in the figures are schematic and not to scale.

(5) FIG. 1 shows a system for feeding makeup water into a water-steam circuit of a steam power plant. A condenser 101 for condensing steam to form water (this water is referred to below as condensate) can be supplied with steam from a turbine system 105 of the steam power plant. A degasification device 109 for degasifying condensate is coupled to the condenser 101 in such a way that a first portion of the condensate of the condenser 101 can be fed to the degasifying device 109. The heat exchanger 102 is coupled to the condenser 101 in such a way that a second portion of the condensate of the condenser 101 can be fed to the condensate/makeup water heat exchanger 102, wherein the heat exchanger 102 is coupled to a feed line 103 in such a way that the makeup water can be fed to the heat exchanger 102. The heat exchanger 102 is configured in such a way that the makeup water can be heated by means of the second portion of the condensate. The heat exchanger 102 is coupled to the degasification device 109 in such a way that the heated makeup water can be fed to the degasification device 109. The water is fed, for example, to an evaporator 107 downstream of the degasification device 109.

(6) In particular, the heated makeup water is supplied to the degasification device 109 directly downstream of the heat exchanger 102 and is not mixed with the first portion or the first mass flow M1 of the condensate of the condenser 101 until in the degasification device 109.

(7) The heat exchanger 102 can be coupled to the degasification device 109 in such a way that the second portion (or a second mass flow m.sub.2) of the condensate can be fed to the degasification device 109 after passing through the heat exchanger 102. Alternatively, as illustrated in FIG. 1, the heat exchanger 102 can be coupled to the condenser 101 in such a way that the second portion of the condensate can be fed to the condenser 101 after passing through the heat exchanger 102.

(8) At least one heating device 106 or, for example, a further multiplicity of further heating devices 108, can be coupled between the condenser 101 and the degasification device 109. The heating devices 106, 108 heat the entire mass flow of the water which flows from the condenser 101 in the direction of the degasification device 109. As is illustrated, for example, in FIG. 1, the second portion (the second mass flow m.sub.2) of the condensate can be branched off after running through all the heating devices 108, and can be fed to the heat exchanger 102. Downstream of the tapping of the second portion, the first portion (first mass flow m.sub.1) of the condensate flows directly into the degasification device 109 in which the first portion of the condensate is mixed with the makeup water m.sub.z heated in the heat exchanger 102.

(9) The heating devices 106, 108 can be configured in such a way that, in order to heat the condensate, the heating devices 106, 108 can be supplied with steam (extraction steam) from the turbine system 105, in particular from a low pressure range of the turbine system 105, of the steam power plant.

(10) The degasification device 109 is configured in such a way that, in order to degasify the water, the degasification device 109 can be supplied with steam from the turbine system 105, in particular from a low pressure range of the turbine system 105, of the steam power plant.

(11) In addition, a condensate pump 104 can be coupled upstream or downstream of the heating devices 106, 108 in order to increase the pressure of the overall mass flow of the water downstream of the condenser 101.

(12) In addition it is to be noted that comprising does not exclude any other elements or steps, and a or an does not exclude a plurality. In addition, it is to be noted that features or steps which have been described with reference to one of the above exemplary embodiments can also be used in combination with other features or steps of other exemplary embodiments described above. Reference symbols in the claims are not to be considered as restrictive.