EP1969285A2 - Circuit de vapeur d'eau d'une centrale electrique - Google Patents

Circuit de vapeur d'eau d'une centrale electrique

Info

Publication number
EP1969285A2
EP1969285A2 EP07703641A EP07703641A EP1969285A2 EP 1969285 A2 EP1969285 A2 EP 1969285A2 EP 07703641 A EP07703641 A EP 07703641A EP 07703641 A EP07703641 A EP 07703641A EP 1969285 A2 EP1969285 A2 EP 1969285A2
Authority
EP
European Patent Office
Prior art keywords
condensate
steam
line
return line
superheater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07703641A
Other languages
German (de)
English (en)
Other versions
EP1969285B1 (fr
Inventor
Uwe Juretzek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP07703641.6A priority Critical patent/EP1969285B1/fr
Publication of EP1969285A2 publication Critical patent/EP1969285A2/fr
Application granted granted Critical
Publication of EP1969285B1 publication Critical patent/EP1969285B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
    • F22G3/003—Superheater drain arrangements

Definitions

  • the present invention relates to a steam cycle of a power plant with at least one steam ⁇ generator and at least one superheater.
  • Such water vapor circuits are known from steam power plants and combined gas and steam power plants, in which the thermal energy of water vapor in a steam turbine is converted into kinetic energy.
  • the steam required to operate the steam turbine is generated in a steam generator from previously purified and desalinated water and superheated in a superheater.
  • the steam of the steam turbine is supplied from the superheater, where it gives up some of its previously ⁇ taken heat energy in form of kinetic energy to the turbine.
  • a generator is coupled, which converts the movement of the turbine into electrical energy.
  • the expanded and cooled steam is passed into a condenser, where it continues to cool while releasing heat and collects in liquid form as water in the so-called hotwell.
  • the steam generator itself can both convention ionel ⁇ len fuels such as oil, gas or coal, but also be heated nuclear.
  • the wastewater can generally be divided into two groups. Draining in the steam area of the steam circuit as beispiels-, a drainage of the superheater, provides "clean" waste water, that is, the chemical nature of Abwas ⁇ sers can direct reuse in the steam circuit ⁇ run to. Dewatering in the water area of the steam cycle, such as the emergency drainage on the boiler drum, on the other hand, results in "contaminated” wastewater, which means that the chemical nature of the wastewater does not permit direct reuse in the steam cycle. The cleanliness of the sewage from the drainage In the steam sector, this is due to the fact that during the separation in the steam generator in water and vapor phase any impurities remain in the water phase and the steam leaves the steam generator clean.
  • the depen ⁇ Gigen claims relate to individual embodiments of the steam circuit according to the invention.
  • the steam cycle according to the present invention comprises at least one steam generator and at least one
  • a condensate collecting and return line including small pumps provided.
  • This condensate collection and return line the corresponding drainage pipes from the steam area, which are located in front of the boiler slide, are involved.
  • This Kondensatsammei- and return line is constantly under pressure, since at least one, advantageously all drainage pipes are connected directly to this, ie it is dispensed with motorized shut-off valves.
  • the condensate collecting in the overheater is therefore not pumped to the condenser via a collecting tank and a condensate storage tank where it is fed back to the actual steam circuit of the power plant but the condensate is only collected in a condensate collecting and return line and fed directly back to the evaporator.
  • the collecting tank (s) including associated secondary components, such as, for example, pumps, heat exchangers, connecting pipelines, etc.
  • a water lock is provided between the drainage line and the condensate collection and return line to minimize any crossflows.
  • the diameter of a superheater pipe should be larger than the diameter of the drainage pipe. If necessary, several drainage lines with a smaller diameter can lead to the condensate collection and return line. This serves to minimize those cross flows that might occur despite the water lock. To control these possible cross flows due to different pressure at the individual drainage points, the lower pressure drainage lines should also be designed with a larger diameter than the higher pressure drainage lines. It would also be possible, the individual drainage pipes except for a drainage line over which a constantly open connection is ensured, so that the condensate collection ⁇ and return line is always under pressure to lead in each case via a motorized valve in the Kondensatsammei- and return line, instead of directly on the condensate Manifold. However, this alternative would technically ⁇ sive.
  • Superheater can be pumped back into the steam generator.
  • the operation of the pump is preferably controllable in dependence on the amount of condensate present in the condensate collecting and return line.
  • a 2-point Ni is veauer linears adopted provided, which detects an upper and lower limit value in the condensate level Kondensatsammellei ⁇ processing.
  • the pump is operated to pump the condensate from the condensate collecting and return line in the evaporator.
  • the pump entspre ⁇ is accordingly turned off to encourage producers to no more condensate into the steam ⁇ .
  • the condensate collecting line preferably comprises a discharge valve provided with an emergency valve, which branches off from the condensate collecting and return line, wherein the discharge line is connected to a waste water container.
  • the Kondensatsammei- and return line can be emptied poorly in case of failure of the pump or pump control.
  • the Kondensatsammei- and return line comprises at least one shut-off valve, better still two shut-off valves, which are respectively provided downstream and upstream of the pump. Accordingly, during the operation of the water ⁇ steam cycle maintenance and repair work on the pump can be made.
  • At least one drainage line is arranged between the superheater and the condensate collecting line.
  • Heater connects to the condensate collector.
  • a water lock is provided between the drainage line and the condensate collecting line in order to minimize any Querströ ⁇ regulations.
  • the diameter of a superheater pipe from which the drainage pipe branches off should be larger than the diameter of the drainage pipe.
  • several drain lines with a smaller diameter lead to the condensate collecting line. This serves to minimize those cross flows that might occur despite the water lock.
  • the lower pressure drainage lines should also be designed with a larger diameter than the higher pressure dewatering lines.
  • the evaporator for discharging the condensate present in this via further drainage lines is preferably connected to the Kondensatsammei- and return line, wherein the Kondensatsammei- and return line branches off a valve provided with a discharge line, which is connected to a sewage collection tank is. Accordingly, the existing in the evaporator water can be drained into the waste container via the fiction, contemporary ⁇ condensate manifold. This has the advantage that the wastewater container does not have to be placed in a correspondingly large pit (to increase the geodetic height), but can be arranged at ground level.
  • the present invention will be described in detail with reference to the drawings. That's it
  • Fig. 1 is a schematic view of a known concept of a steam cycle of a power plant
  • FIG. 2 shows a schematic view of an embodiment of the steam circuit according to the invention
  • Fig. 3 is a schematic view of an embodiment of a condensate collecting line of the steam cycle according to the invention.
  • Fig. 1 is a schematic view showing an be ⁇ kanntes approach to minimization of waste water from a steam cycle 10.
  • the steam circuit 10 comprises three steam generators 12, 14 and 16, vaporizing the pre-heated in the economizers water to water vapor, in Figure . 1, only the respective inlets 17a, 17b and 17c of the Eco ⁇ the evaporator 12, 14 and 16 nomizern shown in the drums.
  • the water vapor is passed from the steam generators 12, 14 and 16 via lines 18, 20 and 22 to superheaters 24, 26 and 28, where it is superheated and then passed via respective lines 30, 32 and 34 to corresponding stages of a steam turbine 36.
  • the steam turbine 36 a large part of the heat energy of the superheated steam in
  • the cooled steam leaves the steam turbine 36 via a line 38 and is fed to a condenser 40 in which it is further cooled and condensed.
  • the condensate enters the hotwell 42 arranged below the condenser 40, from where it is conveyed again in the direction of the steam generators 12, 14 and 16 by means of a pump 44. Between the pump 44 and the steamer ⁇ generators 12, 14 and 16, the condensate by not shown Preheater was brought to a predetermined temperature. In this way, a closed water vapor cycle results.
  • the "clean" waste water in the steam region of the steam circuit 10 ie that waste water containing a direct Wiederverwen ⁇ dung in the water steam circuit 10 allows, by the "contami ⁇ -adjusted" waste water in the water area of the water steam circuit 10, which for a direct reuse in the steam cycle 10 is not suitable, without previously termed ⁇ ride, to separate, the steam circuit 10 comprises a special drainage system, which will be described in more detail below ⁇ .
  • the condensate occurring is partially evaporate and connecting line on the Ver ⁇ 61 pass into the condenser 40th
  • the residual condensate collected in the reservoirs 52 and 60 is pumped via lines 62 and 64 into a condensate receiver 70 using pumps 66 and 68 and stored there. If necessary, the condensate stored in the condensate collecting tank 70 can then be re-supplied via a line 72 to the condenser 40 and in this way the actual water vapor cycle.
  • the amount of wastewater generated can be reduced by up to 60%, which saves costs in the long term. the.
  • expenses associated with the generation and subsequent conditioning of demineralised water are reduced.
  • the contaminated residual condensate collected in the waste water collection tank 80 can be supplied via a line 82 by means of a pump 84 to a heat exchanger 86, where it is cooled accordingly.
  • the cooled condensate can be discarded via a line 88 and supplied to the general sewer system, which can be followed by a not shown Abwasseraufleungs ⁇ system to the line 88, which processes the wastewater so that it complies with the legal requirements.
  • the condensate from the heat exchanger 86 can be supplied via a line 90 to a collecting container 92 and stored therein.
  • the condensate contained in the collection container 92 may then via a line 94 by a pump 96 to a condensate treatment facility are supplied to 98, in which it is processed so that it ent the requirements ⁇ speaking, placed on the method used in the steam circuit 10 water.
  • the condensate treated in this way can then be supplied to the condenser 40 in order to feed the condensate back into the actual steam circuit 10.
  • a disadvantage of the steam cycle 10 shown in FIG. 1 is that, in particular, the drainage of the water Superheater 24, 26 and 28 is very expensive and expensive. Firstly, the drainage lines 54, 56 and 58, which lead from the superheaters 24, 26 and 28 to the sump 60, have a relatively large length to bridge the distance between the superheaters 24, 26 and 28 to the sump 60. Furthermore, it requires a separate collection container 60, which is also associated with costs. Closing ⁇ must pump 68 having a relatively high power Lich to pump contained in the collecting tank 60 the condensate in the condensate tank 70th
  • Fig. 2 is a schematic view showing an embodiment of the invention the steam circuit 110.
  • Components ⁇ ten which correspond to those of the steam circuit 10 shown in Fig. 1 are identified by the same reference numerals.
  • the steam circuit shown in Fig. 2 ⁇ marker 110 corresponds substantially to the steam circuit 10 in Fig. 1.
  • the steam circuit 110 differs from the steam circuit 10 by the drainage of the superheater 24, 26 and 28 and the lead Restentskys ⁇ serisme the evaporator 12, 14 and 16, which is described in more detail below.
  • Fig. 3 The more detailed structure of a superheater and Dampfer Wegerent- 76ssansssystems is shown schematically in Fig. 3, where ⁇ in Fig. 3 by way of example, the drainage system of the overheating ⁇ dec 24 and the evaporator 12 shows.
  • the drainage system For the superheater 26 and the evaporator 14 and for the superheater 28 and the evaporator 16 correspond to the system shown in Fig. 3.
  • Fig. 3 shows the superheater 24 having three headers 142a, 142b and 142c.
  • headers 142a, 142b and 142c bind the individual superheater tubes.
  • Hot exhaust gas of the power plant flows in the direction of arrow 144 to the three superheater tubes over, so that the collecting pipe is heated 142c stronger than the header tube 142b, and the like ⁇ derum stronger than the header tube 142a.
  • From the respective headers 142a, 142b and 142c drain drainage lines 112a, 112b and 112c, which open into a just over 0 m Kon ⁇ densatsammei- and return line 146.
  • the Entskyssanssleitun ⁇ gen 112a, 112b and 112c are merely intended to serve in the headers 142a, 142b and 142c to drain for condensate.
  • Water locks 148, 150 and 162 are provided at the junction between the drainage pipes 112a, 112b and 112c and the condensate collection and return pipe 146, which are also intended to prevent water vapor from entering the condensate collection and return pipe 146.
  • the water locks 148, 150 and 152 are presently designed as U-shaped lines in which condensate sam ⁇ melt, which is to prevent ingress of water vapor in the Kondensatsammei- and return line 146.
  • the condensate ⁇ sammei- and return line 146 is present in Wesentli ⁇ Chen L-shaped, with a substantially extending portion of Kondensatsammei- and return line 146 extends vertically downward in a pit 154th In this substantially vertically downwardly extending portion of the condensate collection and return line 146 sam- melt the condensate, which was taken over the drainage pipes 112a, 112b and 112c the headers 142a, 142b and 142c ⁇ ent.
  • the level of the conduit in the Kondensatsammei- Return ⁇ 146 collected condensate is marked with the processeszif- fer 156th
  • the Kondensatsammei- and rinse ⁇ device 146 further has a level detector, not shown, which detects a maximum level 158 and a minimum level 160 of accumulated in the Kondensatsammei- and return line 146 condensate.
  • the condensate collecting and return line 146 is followed by a
  • Line 162 which includes a valve 164 and a pump 166 arranged at about -2 m. With valve 164 open, condensate from condensate collection and return line 146 may be pumped through line 162 using pump 166. Behind the pump 166, the line 162 branches into the return line 118, which is provided with a valve 168, and into the line 136, which is also provided with a valve 170. The operation of the condensate ⁇ collecting line 146 will be described in more detail below.
  • the pump 166 is switched on, the valves 164 and 168 being opened and the valve 170 being closed. In this way, the condensate collected in the condensate collection and return line 146 is pumped back into the evaporator 12. Detects the level detecting means that the condensate level 156 has reached the minimum level 160, the pump is stopped 166, so that no further condensate from the Kondensatsammei- and scaffold manufacturedlei ⁇ tung is conveyed into the evaporator 12. 146 via the lines 162 and 118th This scenario repeats as soon as the maximum level 158 is reached again.
  • the condensate ⁇ satpegel 156 reaches the maximum level 158, without the pump starts 166, an alarm is triggered because an error of the pump 166 or the pump control must be available. If the pump 166 is defective, the valve 170 of the line 156 can be closed. opens and the condensate are discharged into the sewage tank 80.
  • the evaporator 12 and the condensate collecting and return line 146 are connected to each other via the drainage line 130, the drainage line 130 having a valve 172. If now the condensate contained in the evaporator 12 empties the ⁇ , the valve 168 the return conduit 118 opens overall concluded and the valve 170 of the line 136 and the valve 172 of the drain line 130th The pressurized condensate contained in the evaporator 112 can thus flow with the use of the pump 166 via the Entskyss réelleslei ⁇ device 130, the condensate collecting line 146 and the line 136 to the sewage tank 80.
  • valves 164, 170 and 168 can be closed, so that it is easy to work on the pump 166.
  • the drainage system shown in Fig. 3 is movably designed to counteract a buildup of tension by the cyclic He ⁇ heating and cooling.
  • a significant advantage of the previously described drainage system for the superheater 24, 26 and 28 and the Ver ⁇ steamer 12, 14 and 16 is its simple design. Furthermore, compared to the steam circuit 10 shown in FIG. 1, the (motorized) shut-off valves, the collecting container 60, the pump 68 and the line 64 can be dispensed with, whereby considerable costs can be saved. In addition to the depth ⁇ position of the sewage tank 80 omitted, so the cost is reduced for the pits. It should be noted that the pump 166 compared to the pump 68 must have a wesent ⁇ Lich lower performance. It should be understood that the present invention is not limited to the embodiment described above. Rather, modifications and changes are possible without departing from the scope of the present invention, which is defined by the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Air Humidification (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cleaning And Drying Hair (AREA)

Abstract

L'invention concerne un circuit de vapeur d'eau (110) d'une centrale électrique, circuit comprenant au moins un évaporateur (12 ; 14 ; 16) et au moins un surchauffeur (24 ; 26 ; 28), caractérisé en ce qu'il est prévu entre le surchauffeur (24 ; 26 ; 28) et le générateur de vapeur (12 ; 14 ; 16), une conduite collectrice de condensat et de recyclage (146) pour la collecte du condensat présent dans le surchauffeur (24 ; 26 ; 28) et pour le recyclage du condensat dans l'évaporateur (12 ; 14 ; 16).
EP07703641.6A 2006-01-05 2007-01-04 Cycle à vapeur d'une centrale électrique Not-in-force EP1969285B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07703641.6A EP1969285B1 (fr) 2006-01-05 2007-01-04 Cycle à vapeur d'une centrale électrique

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06000183A EP1806533A1 (fr) 2006-01-05 2006-01-05 Cycle à vapeur d'une centrale électrique
EP07703641.6A EP1969285B1 (fr) 2006-01-05 2007-01-04 Cycle à vapeur d'une centrale électrique
PCT/EP2007/050081 WO2007077248A2 (fr) 2006-01-05 2007-01-04 Circuit de vapeur d'eau d'une centrale electrique

Publications (2)

Publication Number Publication Date
EP1969285A2 true EP1969285A2 (fr) 2008-09-17
EP1969285B1 EP1969285B1 (fr) 2016-09-14

Family

ID=37188868

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06000183A Withdrawn EP1806533A1 (fr) 2006-01-05 2006-01-05 Cycle à vapeur d'une centrale électrique
EP07703641.6A Not-in-force EP1969285B1 (fr) 2006-01-05 2007-01-04 Cycle à vapeur d'une centrale électrique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06000183A Withdrawn EP1806533A1 (fr) 2006-01-05 2006-01-05 Cycle à vapeur d'une centrale électrique

Country Status (7)

Country Link
US (1) US8651067B2 (fr)
EP (2) EP1806533A1 (fr)
CN (1) CN101415992B (fr)
EG (1) EG25000A (fr)
ES (1) ES2609393T3 (fr)
IL (1) IL192620A (fr)
WO (1) WO2007077248A2 (fr)

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FR2956153B1 (fr) * 2010-02-11 2015-07-17 Inst Francais Du Petrole Dispositif de controle d'un fluide de travail a bas point de congelation circulant dans un circuit ferme fonctionnant selon un cycle de rankine et procede utilisant un tel dispositif
ITMI20120837A1 (it) * 2012-05-15 2013-11-16 Ansaldo Energia Spa Impianto a ciclo combinato per la produzione di energia e metodo per operare tale impianto
DE102012217717A1 (de) * 2012-09-28 2014-04-03 Siemens Aktiengesellschaft Verfahren zur Rückgewinnung von Prozessabwässern einer Dampfkraftanlage
EP3066310B1 (fr) 2014-03-05 2018-10-31 Siemens Aktiengesellschaft Design d'un réservoir de détente
DE102015206484A1 (de) * 2015-04-10 2016-10-13 Siemens Aktiengesellschaft Verfahren zum Aufbereiten eines flüssigen Mediums und Aufbereitungsanlage
US10138139B2 (en) 2016-02-12 2018-11-27 Babcock Power Environmental Inc. Wastewater treatment systems and methods
DE102016113007B4 (de) * 2016-07-14 2018-06-07 Mathias Jörgensen Rückführungsanordnung und Verfahren zur Rückführung
AU2020200725A1 (en) * 2019-02-14 2020-09-03 Croplands Equipment Pty Ltd Spray head for an agricultural sprayer

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Also Published As

Publication number Publication date
US8651067B2 (en) 2014-02-18
WO2007077248A3 (fr) 2008-10-16
CN101415992A (zh) 2009-04-22
EP1806533A1 (fr) 2007-07-11
EG25000A (en) 2011-04-27
ES2609393T3 (es) 2017-04-20
WO2007077248A2 (fr) 2007-07-12
CN101415992B (zh) 2011-05-18
US20090165460A1 (en) 2009-07-02
IL192620A (en) 2012-02-29
IL192620A0 (en) 2009-09-22
EP1969285B1 (fr) 2016-09-14

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