WO1997009565A2 - Procede et systeme de demarrage d'un generateur de vapeur a fonctionnement continu - Google Patents

Procede et systeme de demarrage d'un generateur de vapeur a fonctionnement continu Download PDF

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Publication number
WO1997009565A2
WO1997009565A2 PCT/DE1996/001666 DE9601666W WO9709565A2 WO 1997009565 A2 WO1997009565 A2 WO 1997009565A2 DE 9601666 W DE9601666 W DE 9601666W WO 9709565 A2 WO9709565 A2 WO 9709565A2
Authority
WO
WIPO (PCT)
Prior art keywords
water
evaporator
evaporator tubes
steam generator
line
Prior art date
Application number
PCT/DE1996/001666
Other languages
German (de)
English (en)
Other versions
WO1997009565A3 (fr
Inventor
Rudolf Kral
Joachim Franke
Helmuth Huschauer
Original Assignee
Deutsche Babcock Aktiengesellschaft
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 Deutsche Babcock Aktiengesellschaft filed Critical Deutsche Babcock Aktiengesellschaft
Priority to DE59605404T priority Critical patent/DE59605404D1/de
Priority to JP51077497A priority patent/JP2001507436A/ja
Priority to AT96937994T priority patent/ATE193765T1/de
Priority to DK96937994T priority patent/DK0812407T3/da
Priority to EP96937994A priority patent/EP0812407B1/fr
Publication of WO1997009565A2 publication Critical patent/WO1997009565A2/fr
Publication of WO1997009565A3 publication Critical patent/WO1997009565A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F22B29/12—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers

Definitions

  • the invention relates to a method for starting up a once-through steam generator, the evaporator tubes of which the feed water side is flowed through from bottom to top. It further relates to a start-up system for carrying out the method.
  • the amount of the flow medium to be conveyed by a feed pump is preferably kept constant for starting and in a load range below a certain limit load.
  • the flow rate of the feed pump is equal to the evaporator throughput.
  • the invention is therefore based on the object of specifying a method for starting a once-through steam generator, in which on the one hand the start-up losses are as low as possible and in which on the other hand enough water is supplied to the evaporator for reliable cooling of the evaporator tubes.
  • this object is achieved according to the invention in that water emerging or ejected from the evaporator tubes on the outlet side is at least partially fed back to the evaporator tubes on the inlet side.
  • At least part of the water expelled from the evaporator tubes is expediently first collected.
  • the steam contained in the expelled water / water-steam mixture can then advantageously be separated off and overheated.
  • the stated object is achieved according to the invention by providing a drain line which connects an outlet collector common to the evaporator tubes to an inlet manifold common to the evaporator tubes.
  • a water-steam separation container and / or a collecting container can be connected in the discharge line.
  • a check valve which is expediently connected to the drain line prevents backflow from the evaporator inlet to the evaporator outlet.
  • the drain line can either be connected directly to the inlet header or to a connecting line which is connected between the inlet header and a preheater (economizer) arranged in the continuous steam generator.
  • a preheater economizer
  • the advantages achieved by the invention are, in particular, that by returning the water expelled from the evaporator during start-up via a drain line to the evaporator inlet, a self-regulating circulating flow is achieved and reliable cooling of the evaporator tubes is ensured .
  • FIG. 1 An exemplary embodiment of the invention is explained in more detail with reference to a drawing.
  • FIG. 1 schematically shows a once-through steam generator with a vertical throttle cable and with a drain line of a start-up system.
  • the vertical throttle cable of the once-through steam generator 1 is formed by a peripheral wall 2 which merges into a funnel-shaped base 3 at the lower end of the gas cable.
  • the evaporator tubes 4 of the peripheral wall 2 are gas-tightly connected to one another on their long sides, e.g. welded.
  • the bottom 3 comprises a discharge opening 3a for ashes, not shown.
  • the input occurs collector 8 and the outlet header 10 are au ⁇ ßerraum of the gas flue and 'are, for example each formed by a ringför ⁇ Miges tube.
  • the inlet header 8 is connected via a line 12 and a header 14 to the outlet of a high-pressure preheater or economizer 16.
  • the heating surface of the economizer 16 is arranged in a space above the combustion chamber 6 and enclosed by the surrounding wall 2.
  • the economizer 16 is on the input side via a collector 18 and a feed water line 20 with a steam-heated one
  • Heat exchanger 22 connected, which is connected to the pressure side of a feed water pump 24.
  • the suction side of the feed water pump 24 is connected in a manner not shown in detail to a steam turbine via a condenser and is therefore connected to its water-steam circuit.
  • the outlet header 10 is connected via a line 26 to a water-steam separating vessel or separator 28. This, in turn, is connected on the steam side via a line 30 to an inlet header 32 of a high-pressure superheater 34, which is arranged within the peripheral wall 2 between the economizer 16 and the combustion chamber 6.
  • the high-pressure superheater 34 is connected on the output side to a high-pressure part of the steam turbine via a collector 36.
  • an intermediate superheater 38 is provided within the space enclosed by the surrounding wall 2 and is connected via collectors 40, 42 between the high-pressure part and a medium-pressure part of the steam turbine.
  • the economizer 16 the high-pressure superheater.
  • the line 26 is part of a drain line 44 which connects the outlet header 10 to the inlet header 8.
  • a collector in the form of a bottle 46 is connected to the discharge line 44 and is connected to the separator 28 on the water side.
  • a non-return valve 48 is connected in the discharge line 44.
  • feed water S is conveyed via the feed water pump 24 through the heat exchanger 22 and is initially preheated there.
  • the amount of feed water S fed to the evaporator tubes 4 per time unit, ie the feed water flow, can be set as a function of the amount of fuel B (fuel flow) fed to the burners 5 per time unit.
  • the feed water S preheated in this way is preheated further in the economizer 16 and fed via line 12 to the inlet manifold 8 of the evaporator 4. From there, the heated feed water S flows through the obliquely, but preferably vertically arranged, evaporator tube 4 from bottom to top.
  • a water level di is established in the drain line 44 ' . a, which is higher than a water level d2 determined by the weight of the water and the water-steam mixture in the evaporator tubes 4.
  • the geodetic pressure drop in the evaporator tubes 4 is lower than the pressure level in the outlet line 44 from the outlet header 10 or from the bottle 46 to the evaporator 4.
  • This pressure difference causes the Separator 28 separated water and fed into the bottle 46 provided for need back to the evaporator inlet, ie to the inlet header 8 of the evaporator 4.
  • the water stream emerging from the economizer 16 is fed to the evaporator inlet, ie to the inlet header 8.
  • the direct connection of the outlet manifold 10 via the outlet line 44 to the inlet manifold 8 of the evaporator 4 ensures a self-adjusting or regulating circulating stream.
  • the start-up losses due to partial or complete return of the excess water directly to the evaporator inlet 8 are thus kept particularly simple in a simple manner without a complex circulation pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Turbines (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)

Abstract

L'invention concerne un procédé permettant de faire démarrer un générateur de vapeur à fonctionnement continu (1) dont les tubes d'évaporation (4) sont parcourus de haut en bas côté eau d'alimentation. Afin d'éviter les pertes au démarrage, l'eau éjectée des tubes d'évaporation (4) côté sortie est renvoyée au moins en partie dans lesdits tubes d'évaporation (4) côté entrée. L'invention concerne également un système de démarrage comportant un conduit de décharge (44) qui relie la sortie (10) de l'évaporateur à l'entrée (8) dudit évaporateur.
PCT/DE1996/001666 1995-09-08 1996-09-05 Procede et systeme de demarrage d'un generateur de vapeur a fonctionnement continu WO1997009565A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59605404T DE59605404D1 (de) 1995-09-08 1996-09-05 Verfahren und system zum anfahren eines durchlaufdampferzeugers
JP51077497A JP2001507436A (ja) 1995-09-08 1996-09-05 貫流蒸気発生装置を運転する方法とシステム
AT96937994T ATE193765T1 (de) 1995-09-08 1996-09-05 Verfahren und system zum anfahren eines durchlaufdampferzeugers
DK96937994T DK0812407T3 (da) 1995-09-08 1996-09-05 Fremgangsmåde og system til start af en gennemstrømningsdampgenerator
EP96937994A EP0812407B1 (fr) 1995-09-08 1996-09-05 Procede et systeme de demarrage d'un generateur de vapeur a fonctionnement continu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19533351.9 1995-09-08
DE19533351 1995-09-08

Publications (2)

Publication Number Publication Date
WO1997009565A2 true WO1997009565A2 (fr) 1997-03-13
WO1997009565A3 WO1997009565A3 (fr) 1997-04-03

Family

ID=7771691

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001666 WO1997009565A2 (fr) 1995-09-08 1996-09-05 Procede et systeme de demarrage d'un generateur de vapeur a fonctionnement continu

Country Status (8)

Country Link
EP (1) EP0812407B1 (fr)
JP (1) JP2001507436A (fr)
CN (1) CN1164889A (fr)
AT (1) ATE193765T1 (fr)
DE (1) DE59605404D1 (fr)
DK (1) DK0812407T3 (fr)
ES (1) ES2148810T3 (fr)
WO (1) WO1997009565A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19800017A1 (de) * 1998-01-04 1999-07-08 Reinhard Prof Dr Tech Leithner Verfahren zum Betreiben eines Zwangdurchlaufdampferzeugers
WO2018177738A1 (fr) * 2017-03-30 2018-10-04 Siemens Aktiengesellschaft Recirculation d'eau dans des générateurs de vapeur verticaux à circulation forcée

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111802919B (zh) * 2019-04-12 2022-07-15 华帝股份有限公司 蒸汽发生器余水排出控制方法、蒸汽发生器及蒸汽烹饪设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944856C (de) * 1951-10-24 1956-06-28 Siemens Ag Verfahren zum Kleinstlastbetrieb eines Zwangdurchlaufkessels
GB1003618A (en) * 1962-10-30 1965-09-08 Mitsubishi Shipbuilding & Eng Improvements in or relating to steam generators
GB1073276A (en) * 1964-02-28 1967-06-21 Siemens Ag A forced-flow once-through boiler installation
US3356074A (en) * 1965-07-12 1967-12-05 Combustion Eng Vapor generating organziation and method
US3504655A (en) * 1967-10-11 1970-04-07 Foster Wheeler Corp Natural circulation start-up system for once-through steam generator
US3580223A (en) * 1969-04-24 1971-05-25 Steinmueller Gmbh L & C Method and apparatus for operation of a positively driven steam generator with rolled overlap and gastight welded vaporizer walls
DE2735463A1 (de) * 1977-08-05 1979-02-08 Kraftwerk Union Ag Anordnung zur trennung von wasser und dampf bei einem durchlaufdampferzeuger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944856C (de) * 1951-10-24 1956-06-28 Siemens Ag Verfahren zum Kleinstlastbetrieb eines Zwangdurchlaufkessels
GB1003618A (en) * 1962-10-30 1965-09-08 Mitsubishi Shipbuilding & Eng Improvements in or relating to steam generators
GB1073276A (en) * 1964-02-28 1967-06-21 Siemens Ag A forced-flow once-through boiler installation
US3356074A (en) * 1965-07-12 1967-12-05 Combustion Eng Vapor generating organziation and method
US3504655A (en) * 1967-10-11 1970-04-07 Foster Wheeler Corp Natural circulation start-up system for once-through steam generator
US3580223A (en) * 1969-04-24 1971-05-25 Steinmueller Gmbh L & C Method and apparatus for operation of a positively driven steam generator with rolled overlap and gastight welded vaporizer walls
DE2735463A1 (de) * 1977-08-05 1979-02-08 Kraftwerk Union Ag Anordnung zur trennung von wasser und dampf bei einem durchlaufdampferzeuger

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19800017A1 (de) * 1998-01-04 1999-07-08 Reinhard Prof Dr Tech Leithner Verfahren zum Betreiben eines Zwangdurchlaufdampferzeugers
DE19800017C2 (de) * 1998-01-04 2001-04-26 Reinhard Leithner Verfahren zum Betreiben eines Zwangdurchlaufdampferzeugers
WO2018177738A1 (fr) * 2017-03-30 2018-10-04 Siemens Aktiengesellschaft Recirculation d'eau dans des générateurs de vapeur verticaux à circulation forcée
US11692703B2 (en) 2017-03-30 2023-07-04 Siemens Energy Global GmbH & Co. KG Water feedback in vertical forced-flow steam generators

Also Published As

Publication number Publication date
ATE193765T1 (de) 2000-06-15
WO1997009565A3 (fr) 1997-04-03
DE59605404D1 (de) 2000-07-13
JP2001507436A (ja) 2001-06-05
EP0812407B1 (fr) 2000-06-07
CN1164889A (zh) 1997-11-12
ES2148810T3 (es) 2000-10-16
EP0812407A1 (fr) 1997-12-17
DK0812407T3 (da) 2000-10-23

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