EP0308596A1 - Procédé de réglage du débit d'eau d'alimentation d'une installation de production de vapeur - Google Patents

Procédé de réglage du débit d'eau d'alimentation d'une installation de production de vapeur Download PDF

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Publication number
EP0308596A1
EP0308596A1 EP88111049A EP88111049A EP0308596A1 EP 0308596 A1 EP0308596 A1 EP 0308596A1 EP 88111049 A EP88111049 A EP 88111049A EP 88111049 A EP88111049 A EP 88111049A EP 0308596 A1 EP0308596 A1 EP 0308596A1
Authority
EP
European Patent Office
Prior art keywords
steam
signal
temperature
control means
feed water
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
EP88111049A
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German (de)
English (en)
Other versions
EP0308596B1 (fr
Inventor
Cenek Svoboda
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.)
Trasformazione Societaria sulzer AG
Original Assignee
Sulzer AG
Gebrueder Sulzer AG
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Publication date
Application filed by Sulzer AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of EP0308596A1 publication Critical patent/EP0308596A1/fr
Application granted granted Critical
Publication of EP0308596B1 publication Critical patent/EP0308596B1/fr
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
    • F22B35/101—Control systems for steam boilers for steam boilers of forced-flow type of once-through type operating with superimposed recirculation during starting or low load periods, e.g. composite boilers

Definitions

  • the invention relates to a method for regulating the feed water quantity of a steam generator system fired with fossil fuels, which contains a feed water pump arranged in a feed water line, an evaporator connected downstream of the feed water pump, a water separator connected downstream of the evaporator, control means for controlling the feed water quantity and a switchover device which operates at a low steam generator load with wet steam, a first signal triggered by the water level in the water separator and, in the case of high steam generator load with dry steam, a second signal triggered by the steam temperature downstream of the water separator can act on the control means.
  • Such a method is known from CH-PS 517 266, in which the switching element is controlled by the pressure of the feed water at a pressure measuring point between the feed water pump and the evaporator.
  • the known method works satisfactorily for clearly low loads with wet steam and clearly high loads with dry steam. At loads of around 45%, ie in the vicinity of the transition from wet to dry steam and vice versa, the known method has not proven itself because the switchover element tends to fluctuate cyclically between the two types of control.
  • the pressure in the feed water line is influenced by various factors, such as on the degree of contamination of the water or steam lines arranged downstream of the pressure measuring point; these factors lead to undesirable deviations in the control and, in particular, aggravate the problem in connection with the critical load range by 45% load.
  • the difference ⁇ T between the steam temperature at the inlet of the water separator and the saturation temperature of the steam at the associated water separator pressure is formed, that this temperature difference ⁇ T is compared with a limit value temperature G ⁇ 0 ° C and that the switching element is controlled in this way is that the first signal acts on the control means if the temperature difference ⁇ T is less than or equal to zero, the second signal acts on the control means if the temperature difference ⁇ T is greater than the limit value G and if the temperature difference ⁇ T is greater than zero but less than or equal to the limit value G. the first or second signal which was last active before that continues to act on the control means.
  • the water content of the steam entering the water separator becomes clear and unaffected by disruptive factors detected. Furthermore, the selection of the limit value temperature in the critical load range prevents an uncontrolled back and forth fluctuation of the feed water quantity; The selection or setting of the limit temperature is carried out experimentally for each system in such a way that the cyclical fluctuations of the switching element described at the beginning are prevented.
  • Claims 2 to 5 characterize particularly advantageous variants of the method according to the invention.
  • the variant according to claim 6 ensures a rapid adaptation of the feed water quantity to changes in the furnace, claim 7 representing a preferred application of the variant according to claim 6, according to which an effect of the third signal on wet steam at the inlet of the water separator is prevented.
  • the third signal would normally counteract the desired control process, since e.g. in the event of a load increase due to an increase in the fuel quantity, the third signal would cause a parallel increase in the feed water quantity, as a result of which less steam would be generated and thus undesirable heating of the steam lines downstream of the water separator would occur.
  • the drawing shows schematically the essential parts of a steam generator system according to the invention.
  • a feed water pump 2 arranged in a feed water line 1, an evaporator 3 connected downstream of this pump 2, a water separator 4 connected downstream thereof, and control means 6 for controlling the feed water quantity and an in A switching unit 7 arranged in a control unit 71, together with a fossil fuel-burning furnace, are the main components of the steam generator system.
  • the switchover device 7 has a first signal triggered by the water level in the water separator 4 at low load and a second signal triggered by a steam temperature downstream of the water separator 4 at high load, with dry steam, on the control means 6.
  • Between the feed water pump 2 and the evaporator 3 is also from the furnace 3 'heated economizer 8 is arranged.
  • the water separator 4 On the steam side, the water separator 4 is followed by a first and a second steam superheater 5 or 5 'in series.
  • a circulation pump 9 is used to circulate the water accumulating in the water separator 4 through a water outlet line 14, the economizer 8, the evaporator 3 and back to the separator 4.
  • a check valve 15 through which flow flows is provided, which prevents water from the feed water line 1 from flowing into the separator 4 via the line 14.
  • a line 12 connects the outlet of the evaporator 3 to the inlet of the separator 4; a first temperature measuring device 16 is provided in it.
  • the separator 4 is connected on the steam side to the first superheater 5 via a steam outlet line 13 in which a flow meter 25 is arranged.
  • the outlet of the second superheater 5 ' is connected via a turbine steam line 18 to a steam turbine 10 which drives a generator 11.
  • the outlet of the steam turbine 10 is connected to the feed water line 1 via pipes not shown in the drawing.
  • the water separator 4 has a water level meter 20.
  • the first temperature measuring device 16 generates a signal proportional to the steam temperature T E at the inlet of the water separator 4.
  • a first comparator 171 the difference ⁇ T between this temperature T E and the saturation temperature 50 of the steam at the associated water separator pressure is formed, which is measured by a sensor 51 and fed to a device 52 in which the associated saturation temperature 50 is determined.
  • This temperature difference .DELTA.T is fed via a signal line 19 to a control element 70 which acts on the switching element 7 via a further signal line 19 'in a manner described below.
  • the water level meter 20 sends a signal proportional to the water level in the separator 4 via a signal line 29 to a second comparator 172, in which this signal is compared with a water level setpoint 21.
  • the difference between the two signals is fed to a PID controller 22 and from this to a third comparator 173.
  • This third comparison element 173 also flows from the flow meter 25, which is proportional to the steam flow Dampf D in the steam outlet line 13 generated signal, which is transmitted via a signal line 39 containing a link 26 for weakening the signal strength.
  • the signal 101 - referred to as the "first signal” - is formed in the third comparison element 173 and is forwarded via a signal line 49 to a first contact 27 of the switching element 7.
  • the temperature measuring device 30 sends a signal proportional to the steam temperature T A between the first and the second superheater 5 or 5 'via a signal line 59 to a fourth comparison element 174, in which the difference between this temperature and a temperature setpoint 31 is formed.
  • This difference is fed to a further PID controller 32, which forms a signal 102 - referred to as the "second signal" - and has it act on a second contact 37 of the switching element 7.
  • the switching element 7 - controlled by the temperature difference ⁇ T - connects one of the two contacts 27 and 37 to a fifth comparing element 175 and thus transmits the "first" or "second signal” to this comparing element with the aid of the control unit 71.
  • this comparator 175 is given a signal 43 by a maximum value element 40, which forms a "third signal".
  • the maximum element 40 receives a signal 41 which reflects a preselected minimum load - preferably the one at which the transition from wet steam to dry steam and vice versa takes place - and a signal 42 triggered by the flow meter 35 which determines the load of the steam generator Amount of fuel ⁇ B is proportional and that was reshaped in a dynamic element 42 'for comparison with the minimum load signal 41.
  • the maximum value element 40 selects the third signal 43 corresponding to the larger of the two signals 41 and 42. As already mentioned, this is fed to the comparator 175.
  • the sum of the signal coming from the control unit 71 and the signal 43 is input into the control means 6, which act on the quantity of feed water.
  • the control means 6 is a conventional design which can act both on the speed of the feed water pump 2 and on a valve in the feed water line 1 or both. Since these means are known per se and are not essential to the invention, they are not discussed in more detail here.
  • the steam generator system works as follows:
  • the feed water pump 2 feeds feed water via the feed water line 1 in the economizer 8, in which it is preheated by the furnace 3 ';
  • the preheated water passes from the economizer 8 into the evaporator 3. Here it is evaporated and enters the water separator 4 either as wet or as dry steam via line 12.
  • the water separator 4 separates the liquid and the vapor phase of the incoming steam from each other, after which the liquid phase is returned to the feed water line 1 via the water outlet line 14 and the check valve 15 by means of the circulation pump 9, while the vapor phase is returned to the superheaters 5 via the steam outlet line 13 , 5 'flows.
  • the superheated steam is transferred to the turbine steam line 18 Steam turbine 10 directed, in which it expands and does work for generating electrical current in the generator 11.
  • the first and second signals coming from the switching element 7 are added to the "third signal" and fed to the control means 6 for controlling the quantity of feed water, so that in addition to the change in the water level in the water separator 4 or the steam temperature T A downstream of the Water separator 4, also the amount of fuel ⁇ B flowing to the furnace 3 ', which is decisive for the respective load of the steam generator, is taken into account in the regulation.

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)
EP88111049A 1987-09-22 1988-07-11 Procédé de réglage du débit d'eau d'alimentation d'une installation de production de vapeur Expired - Lifetime EP0308596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3650/87 1987-09-22
CH3650/87A CH673697A5 (fr) 1987-09-22 1987-09-22

Publications (2)

Publication Number Publication Date
EP0308596A1 true EP0308596A1 (fr) 1989-03-29
EP0308596B1 EP0308596B1 (fr) 1991-12-11

Family

ID=4260560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111049A Expired - Lifetime EP0308596B1 (fr) 1987-09-22 1988-07-11 Procédé de réglage du débit d'eau d'alimentation d'une installation de production de vapeur

Country Status (6)

Country Link
US (1) US4825654A (fr)
EP (1) EP0308596B1 (fr)
JP (1) JPS6490902A (fr)
CH (1) CH673697A5 (fr)
DE (1) DE3866841D1 (fr)
FI (1) FI90377C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024803A1 (fr) * 1995-02-09 1996-08-15 Siemens Aktiengesellschaft Procede et dispositif pour la mise en marche d'un generateur de vapeur en continu

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT411632B (de) * 2000-04-19 2004-03-25 Tech Alternative Elektronische Verfahren zum regeln der entnahmetemperatur von brauchwasser
US8544272B2 (en) * 2007-06-11 2013-10-01 Brightsource Industries (Israel) Ltd. Solar receiver
CN101614203B (zh) * 2009-07-27 2011-05-25 广州粤能电力科技开发有限公司 一种电动给水泵自动控制的方法和系统
US9255569B2 (en) 2010-05-03 2016-02-09 Brightsource Industries (Israel) Ltd. Systems, methods, and devices for operating a solar thermal electricity generating system
DE102010042458A1 (de) * 2010-10-14 2012-04-19 Siemens Aktiengesellschaft Verfahren zum Betreiben einer kombinierten Gas- und Dampfturbinenanlage sowie zur Durchführung des Verfahrens hergerichtete Gas- und Dampfturbinenanlage und entsprechende Regelvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096744A (en) * 1958-12-23 1963-07-09 Sulzer Ag Method of and apparatus for regulating the steam temperature in a steam generator
US3164135A (en) * 1961-01-27 1965-01-05 Combustion Eng Monotube boiler feedwater and steam temperature control
FR1418864A (fr) * 1964-06-25 1965-11-26 Sulzer Ag Procédé et dispositif pour agir sur le débit d'eau d'alimentation dans les générateurs de vapeur à circulation forcée
CH517266A (de) * 1969-12-24 1971-12-31 Sulzer Ag Verfahren zum Gleitdruckbetrieb eines Zwanglaufdampferzeugers und Zwanglaufdampferzeugeranlage zum Durchführen des Verfahrens
FR2185298A5 (fr) * 1972-05-16 1973-12-28 Sulzer Ag
FR2401380A1 (fr) * 1977-08-23 1979-03-23 Sulzer Ag Generateur de vapeur a circulation forcee
DE3243578A1 (de) * 1982-11-25 1984-05-30 Deutsche Babcock Werke AG, 4200 Oberhausen Verfahren zum betreiben eines zwangsdurchlaufdampferzeugers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125073A (en) * 1964-03-17 Profos
US4213304A (en) * 1978-11-24 1980-07-22 Leeds & Northrup Company Boiler control system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096744A (en) * 1958-12-23 1963-07-09 Sulzer Ag Method of and apparatus for regulating the steam temperature in a steam generator
US3164135A (en) * 1961-01-27 1965-01-05 Combustion Eng Monotube boiler feedwater and steam temperature control
FR1418864A (fr) * 1964-06-25 1965-11-26 Sulzer Ag Procédé et dispositif pour agir sur le débit d'eau d'alimentation dans les générateurs de vapeur à circulation forcée
CH517266A (de) * 1969-12-24 1971-12-31 Sulzer Ag Verfahren zum Gleitdruckbetrieb eines Zwanglaufdampferzeugers und Zwanglaufdampferzeugeranlage zum Durchführen des Verfahrens
FR2185298A5 (fr) * 1972-05-16 1973-12-28 Sulzer Ag
FR2401380A1 (fr) * 1977-08-23 1979-03-23 Sulzer Ag Generateur de vapeur a circulation forcee
DE3243578A1 (de) * 1982-11-25 1984-05-30 Deutsche Babcock Werke AG, 4200 Oberhausen Verfahren zum betreiben eines zwangsdurchlaufdampferzeugers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 12 31. Januar 1979, Seite 86 M47; & JP-A-53 137 304 (MITSUBISHI JUKOGYO K.K.) 30-11-1978 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024803A1 (fr) * 1995-02-09 1996-08-15 Siemens Aktiengesellschaft Procede et dispositif pour la mise en marche d'un generateur de vapeur en continu

Also Published As

Publication number Publication date
FI883601A7 (fi) 1989-03-23
CH673697A5 (fr) 1990-03-30
FI90377B (fi) 1993-10-15
FI90377C (fi) 1994-01-25
US4825654A (en) 1989-05-02
JPS6490902A (en) 1989-04-10
DE3866841D1 (de) 1992-01-23
FI883601A0 (fi) 1988-08-01
EP0308596B1 (fr) 1991-12-11

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