EP0815387B1 - Verfahren und vorrichtung zur überwachung der speisewasserzufuhr zu einem dampferzeuger - Google Patents

Verfahren und vorrichtung zur überwachung der speisewasserzufuhr zu einem dampferzeuger Download PDF

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Publication number
EP0815387B1
EP0815387B1 EP96904735A EP96904735A EP0815387B1 EP 0815387 B1 EP0815387 B1 EP 0815387B1 EP 96904735 A EP96904735 A EP 96904735A EP 96904735 A EP96904735 A EP 96904735A EP 0815387 B1 EP0815387 B1 EP 0815387B1
Authority
EP
European Patent Office
Prior art keywords
temperature
steam
water supply
feed
evaporator
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.)
Expired - Lifetime
Application number
EP96904735A
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German (de)
English (en)
French (fr)
Other versions
EP0815387A1 (de
Inventor
Joachim Franke
Eberhard Wittchow
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
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0815387A1 publication Critical patent/EP0815387A1/de
Application granted granted Critical
Publication of EP0815387B1 publication Critical patent/EP0815387B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
    • F22B35/10—Control systems for steam boilers for steam boilers of forced-flow type of once-through type

Definitions

  • the invention relates to a method for monitoring the feed water supply to a once-through steam generator, at which is the steam temperature of the evaporated feed water for determination the feed water supply is used. It relates further on a device for carrying out the Procedure.
  • a circulating one Water-steam mixture While in a natural circulation steam generator a circulating one Water-steam mixture only partially evaporated, performs the heating of the in a continuous steam generator gas-tight surrounding walls of a combustion chamber, vertical arranged evaporator tubes to a complete Evaporation of the flow medium in the evaporator tubes in one pass.
  • Pass-through steam generators are usually used for control purposes operated such that predetermined setpoints for the Steam output and the outlet temperature of the evaporator downstream superheater adhered to as precisely as possible become.
  • the end of evaporation and thus the end of it The beginning of steam overheating is not fixed locally. The Rather, the end of evaporation depends, among other things, on the load and depending on the pollution status of the Evaporator or superheater heating surfaces and the fuel water content independently. Therefore, there is a clear difference given to natural circulation steam generator where the end the evaporation is fixed in a water-steam separation drum is. With a display device for the water level in the drum a measuring instrument is available for the operating personnel, with which an adequate feed water supply to the natural circulation steam generator can be monitored.
  • the invention is therefore based on the object of a method and a device for reliably monitoring a sufficient Specify water supply to a once-through steam generator.
  • this object is achieved according to the invention solved in that the actual value of the steam temperature with a Setpoint determined from operational parameters together is shown.
  • the operating setpoint of the steam temperature expediently determined from the steam generator output.
  • the setpoint is preferably dependent on the steam generator load, the composition of the once-through steam generator supplied fuel, the degree of contamination of the evaporator and / or superheater heating surfaces and the feed water temperature formed such that the temperature of the in-line steam generator Generated live steam remains constant.
  • the stated object is achieved according to the invention by a display device, the one hand with a measuring device for Determination of the actual value of the steam temperature and on the other hand with one to determine the setpoint for the steam temperature Setpoint generator provided from operational parameters is connected, and the one for displaying the steam temperature Temperature scale provided at the outlet of the evaporator includes, on the temperature scale the actual value and the The setpoint of the steam temperature can be displayed together.
  • the temperature scale is expediently a temperature window superimposed for the setpoint of the steam temperature.
  • An embodiment of the invention is based on a Drawing explained in more detail.
  • the figure shows a monitoring device for the steam temperature behind an evaporator of a once-through steam generator.
  • the figure shows schematically a once-through steam generator with a feed water preheating surface (economizer) 2, which is located in a gas train (not shown).
  • the preheating heating surface 2 is connected upstream of a feed water pump 4 and an evaporator heating surface 6 is connected downstream, which in turn is followed by a superheater heating surface 8.
  • a measuring device 12 for measuring the feed water temperature T 1 is arranged in a line 10 for feed water SW led from the feed water pump 4 to the preheating surface 2.
  • a measuring device 16 for measuring the actual value T i of the steam temperature at the outlet or outlet of the evaporator heating surface 6 is provided at the outlet of the evaporator heating surface 6 in a connecting line 14 between the evaporator heating surface 6 and the superheater heating surface 8. Furthermore, at the outlet or outlet of the superheater heating surface 8, a measuring device 18 is provided for measuring the temperature T 2 of the live steam FD flowing out of the superheater heating surface 8 and fed to a steam turbine (not shown). In addition, a measuring device 20 for measuring the feed water flow SW t through the line 10 is arranged in the feed water line 10 led from the feed water pump 4 to the preheating surface 2.
  • a device 22 for monitoring the amount of feed water SW supplied to the continuous-flow steam generator per unit of time is assigned a setpoint generator 24, which outputs a setpoint T s for the steam temperature at the outlet of the evaporator heating surface 6 to the device 22.
  • the steam generator output or steam generator load L and a value W B for the composition, in particular the water content, of the fuel supplied by the continuous steam generator are supplied to the setpoint generator 24 as input variables.
  • the feed water temperature T 1 and the value SW t for the feed water mass flow and the current value for the live steam temperature T 2 are fed to the setpoint generator 24 as input variables.
  • the setpoint T s for the steam temperature at the outlet of the evaporator heating surface 6 is formed as a function of the parameters L, T 1 , T 2 , W B and SW t such that the fresh steam temperature T 2 remains constant.
  • the setpoint T s for the steam temperature at the outlet of the evaporator heating surface 6 is taken from a function generator unit 26 of the setpoint generator 24.
  • the input value of the function generator unit 26 is the power or load value L ', which is derived in a computer module 28 of the setpoint generator 24 from the parameters L, B, SW t , T 1 and T 2 .
  • the functional relationship between these parameters is implemented in the computer module 28, for example in the form of characteristic curve fields KF.
  • the output value L ' is preferably delayed.
  • a delay in the steam temperature T i at the outlet of the evaporator heating surface 6 is also taken into account when the heat flow into the evaporator heating surface 6 changes, since a mass flow requires a finite period of time to flow through the evaporator heating surface 6.
  • a predefinable function of the load L for the setpoints T s of the steam temperature at the outlet of the evaporator heating surface 6 is stored, which is obtained from values obtained during steady-state operation of the continuous steam generator. determined for the target temperature T s and entered into the function transmitter unit 26.
  • the device 22 used to monitor the feed water supply to the continuous steam generator is a display instrument with a temperature scale 30, which represents the usual range of the steam temperature T behind the end of the evaporator heating surface 6 of, for example, 380 ° C. to 440 ° C.
  • a pointer 32 moves on this temperature scale 30 of the display instrument and shows the actual value T i of the steam temperature at the outlet of the evaporator heating surface 6.
  • a temperature window 34 with a temperature band of, for example, ⁇ 20 K moves on this temperature scale 30, which extends above and below a line 38 marked by an arrow 36 for the desired value T s of the steam temperature at the outlet of the evaporator heating surface 6.
  • This temperature window 34 can be subdivided into "normal range”, “non-normal range” and “critical range” areas and thereby represents different risk areas for a deviation of the actual value T i from the target value T s .
  • a first area 40 below an upper limit temperature T o and a second area 42 above a lower limit temperature T u are highlighted within the temperature window 34, for example in terms of color, in relation to a central area 44, which represents the normal area.
  • the setpoint T s of the steam temperature at the outlet of the evaporator heating surface 6 and thus the temperature window 34 will move to low temperatures.
  • the actual value T i will follow the target value T s .
  • a temperature difference between the target value T s and the actual value T i can temporarily increase due to dynamic processes. This is taken into account by the temperature band of the temperature window 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
EP96904735A 1995-03-16 1996-03-04 Verfahren und vorrichtung zur überwachung der speisewasserzufuhr zu einem dampferzeuger Expired - Lifetime EP0815387B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19509082 1995-03-16
DE19509082 1995-03-16
PCT/DE1996/000382 WO1996028689A1 (de) 1995-03-16 1996-03-04 Verfahren und vorrichtung zur überwachung der speisewasserzufuhr zu einem dampferzeuger

Publications (2)

Publication Number Publication Date
EP0815387A1 EP0815387A1 (de) 1998-01-07
EP0815387B1 true EP0815387B1 (de) 1999-08-18

Family

ID=7756578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96904735A Expired - Lifetime EP0815387B1 (de) 1995-03-16 1996-03-04 Verfahren und vorrichtung zur überwachung der speisewasserzufuhr zu einem dampferzeuger

Country Status (8)

Country Link
US (1) US6044804A (sh)
EP (1) EP0815387B1 (sh)
JP (1) JPH11501719A (sh)
CN (1) CN1097699C (sh)
DE (1) DE59602800D1 (sh)
IN (1) IN187506B (sh)
RU (1) RU2152556C1 (sh)
WO (1) WO1996028689A1 (sh)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7128466B2 (en) * 2001-07-09 2006-10-31 Ewig Industries Co., Ltd. Dual thermometer system
EP2065641A3 (de) * 2007-11-28 2010-06-09 Siemens Aktiengesellschaft Verfahren zum Betrieben eines Durchlaufdampferzeugers sowie Zwangdurchlaufdampferzeuger
EP2194320A1 (de) * 2008-06-12 2010-06-09 Siemens Aktiengesellschaft Verfahren zum Betreiben eines Durchlaufdampferzeugers sowie Zwangdurchlaufdampferzeuger
US8325049B2 (en) * 2009-07-06 2012-12-04 Thermo Diagnostics Company LLC Method and system for measuring temperature and pressure in different regions to determine steam quality
US8816865B1 (en) 2009-07-06 2014-08-26 Walter T. Deacon Method and system for measuring temperature and pressure in different regions to determine steam quality
US9328633B2 (en) 2012-06-04 2016-05-03 General Electric Company Control of steam temperature in combined cycle power plant
DE102014222682A1 (de) 2014-11-06 2016-05-12 Siemens Aktiengesellschaft Regelungsverfahren zum Betreiben eines Durchlaufdampferzeugers

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE214917C (sh) *
DE1172273B (de) * 1960-04-16 1964-06-18 Continental Elektro Ind Ag Speisewasserregelungseinrichtung an Dampferzeugungsanlagen
US3596516A (en) * 1969-03-27 1971-08-03 Texaco Inc Method and apparatus for measuring steam properties
CH557986A (de) * 1974-03-22 1975-01-15 Sulzer Ag Verfahren und vorrichtung zum regeln eines dampferzeugers.
DE2620734C3 (de) * 1976-05-11 1979-12-13 Kraftwerk Union Ag, 4330 Muelheim Überwachungsanordnung für einen Durchlauf-Dampferreuger zur Ermittlung der Abweichungen zwischen der vom Speisewasser aufgenommenen und der von der Feuerung abgegebenen Wärmemenge
DE3243578C3 (de) * 1982-11-25 1998-10-22 Babcock Energie Umwelt Verfahren zum Betreiben eines Zwangsdurchlaufdampferzeugers
JPS6088806A (ja) * 1983-10-21 1985-05-18 Mitsui Eng & Shipbuild Co Ltd 内燃機関の廃熱回収装置
SE469090B (sv) * 1991-09-13 1993-05-10 Abb Carbon Ab Foerfarande och anordning foer temperaturmaetning i utloppet fraan en foeraangare i en genomstroemningspanna
DE59304751D1 (de) * 1992-05-04 1997-01-23 Siemens Ag Zwangdurchlaufdampferzeuger
US5279263A (en) * 1993-02-05 1994-01-18 Elsag International B.V. Cascaded steam temperature control applied to a universal pressure boiler

Also Published As

Publication number Publication date
RU2152556C1 (ru) 2000-07-10
CN1172523A (zh) 1998-02-04
JPH11501719A (ja) 1999-02-09
CN1097699C (zh) 2003-01-01
DE59602800D1 (de) 1999-09-23
US6044804A (en) 2000-04-04
WO1996028689A1 (de) 1996-09-19
EP0815387A1 (de) 1998-01-07
IN187506B (sh) 2002-05-11

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