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EP0639253A1 - Generateur de vapeur a circulation forcee. - Google Patents

Generateur de vapeur a circulation forcee.

Info

Publication number
EP0639253A1
EP0639253A1 EP93908800A EP93908800A EP0639253A1 EP 0639253 A1 EP0639253 A1 EP 0639253A1 EP 93908800 A EP93908800 A EP 93908800A EP 93908800 A EP93908800 A EP 93908800A EP 0639253 A1 EP0639253 A1 EP 0639253A1
Authority
EP
European Patent Office
Prior art keywords
value
heating surface
evaporator heating
steam generator
setpoint
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
EP93908800A
Other languages
German (de)
English (en)
Other versions
EP0639253B1 (fr
Inventor
Axel Butterlin
Hermann Doerr
Joachim Franke
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25915217&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0639253(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19924217626 external-priority patent/DE4217626A1/de
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP93908800A priority Critical patent/EP0639253B1/fr
Publication of EP0639253A1 publication Critical patent/EP0639253A1/fr
Application granted granted Critical
Publication of EP0639253B1 publication Critical patent/EP0639253B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 once-through steam generator with an evaporator heating surface and with a device connected upstream of the evaporator heating surface to set the feed water mass flow M into the evaporator heating surface and with a control device associated with this device, the controlled variable of which is the feed water mass flow M. and whose setpoint Ms "for the feed water mass flow is guided as a function of a setpoint L assigned to the steam generator output.
  • a forced-flow steam generator of the type mentioned at the outset is characterized in accordance with the invention in that the control device is provided with a device for forming the size
  • Processing the actual value of the specific enthalpy at the inlet of the evaporator heating surface enables drawing the heat flow flowing into the evaporator heating surface to determine the setpoint for the feed water mass flow, so that the feed water mass flow supplied to the evaporator heating surface can be largely adapted to the heat flow supplied to the evaporator heating surface. This enables targeted guidance of the specific enthalpy at the outlet of the evaporator heating surface.
  • Evaporator heating surface measured pressure temporarily reduced by a correction value and temporarily increased by a correction value when this second power value L2 or the actual value of the pressure measured behind the evaporator heating surface decreases.
  • Enthalpy is switched at the input of the evaporator heating surface and this temporarily reduces the value of the variable formed as the setpoint Ms g 3 when the actual value h .. - the specific enthalpy at the input of the evaporator heating surface by a correction value and when this actual value h decreases. p temporarily increased by a correction value. This takes into account that the effects of changes in mass flow and temperature of the feed water entering the evaporator heating surface in the evaporator heating surface * are not synchronous.
  • Figure 1 shows schematically a once-through steam generator according to the invention.
  • FIG. 2 and 3 show in a diagram the time course of the specific enthalpy at the outlet of the evaporator heating surface of the once-through steam generator according to FIG. 1.
  • the forced flow steam generator according to Figure 1 has a feed water preheating surface (economizer heating surface) 2, which is located in a gas train, not shown. In terms of flow, this feed water preheating surface 2 is preceded by a feed water pump 3 and an evaporator heating surface 4.
  • a measuring device 9 for measuring the actual value h- F of the specific enthalpy of the feed water at the inlet of the evaporator heating surface 4 is provided at the entry of the evaporator heating surface 4 in the connecting line between the feed water preheating heating surface 2 and the evaporator heating surface 4.
  • a drive motor on the feed water pump 3 is assigned a very fast controller, specifically a PI controller 6, at the input of which the control deviation ⁇ as a controlled variable.
  • the controller 6 is assigned a device 8 for forming the setpoint M for the feed water mass flow.
  • This device 8 has, on the one hand, as input variables a setpoint L for the output of the once-through steam generator which is output by a setpoint generator 7 and, on the other hand, the actual value h- F of the specific enthalpy at the inlet of the evaporator heating surface 4 determined by the measuring device 9.
  • the setpoint value L of the power of the once-through steam generator which changes time and again during operation and which is fed directly to the fuel controller in the (not shown) firing control loop, is also fed to the input of a first delay element 13 of the device 8.
  • This delay element 13 which is of higher order, for example of 2nd order, gives a first signal or a delayed first power worth Ll.
  • This first power value L1 is fed to the inputs of function transmitter units 10 and 11 of the function transmitter of the device 8.
  • a value M (L1) for the feed water mass flow appears at the output of the function transmitter unit 10, and a value ⁇ h (Ll) for the difference from the specific enthalpy h appears at the output of the function transmitter unit 11.
  • the output variables M (L1) and ⁇ h (Ll) of the function generator units 10 and 11 are multiplied together in a multiplication element 14 of the function generator of the device 8.
  • the product value Q (L1) obtained corresponds to the heat flow into the evaporator heating surface 4 at the power value Ll.
  • This quantity Q (L1) is entered as a counter in a divider 15.
  • a setpoint h (L2) is taken from a third function generator unit 12 of the function generator of the device 8.
  • the input value of the function generator unit 12 arises at the output of a second delay element 16, in particular a delay element of the first order, the input variable of which is the first power value L1 at the output of the first delay element 13.
  • the input value of the third function generator unit 12 is a second power value L2, which is delayed compared to the first power value L1.
  • the values h "(L2) as a function of L2 are stored in the third function generator unit 12; they are determined from values for h ", which were respectively obtained during a steady-state operation of the continuous steam generator and were entered into the third function generator unit 12.
  • the output of the divider 15 can be the setpoint
  • the output of the second delay element 16 there can advantageously be the input of a differentiating element 17, the output of which is switched negatively to a summing element 18.
  • This summing element 18 corrects the value for the heat flow Q (L1) into the evaporator heating surface 4 by the output signal of the differentiating element 17.
  • the input of the differentiating element 17 can also - as in FIG. 1 only indicated by dashed lines - on a device 30 for measuring the actual value of the pressure p. are located behind the evaporator heating surface 4 (for example also behind a superheater heating surface of the forced-flow steam generator connected downstream in terms of flow).
  • Between the input of the differentiating element 17 and such a device 30 for measuring the actual value of the pressure p. can also be connected to a function generator, for example, as the output signal that the measured pressure p. outputs the corresponding saturated steam temperature to the differentiating member 17.
  • a further differentiating element 24 can advantageously be provided as a functional element with differentiating behavior.
  • This differentiating element 24 has, as an input variable, the actual value h- E of the specific enthalpy at the inlet of the evaporator heating surface 4, determined with the measuring device 9.
  • the output of the differentiating element 24 is also connected negatively to the summing element 18.
  • the once-through steam generator is in a steady state and the setpoint L for the steam generator output is constant.
  • the power values L1 at the output of the delay element 13 and L2 at the output of the delay element 16 are thus also constant; they have the same value as the setpoint L.
  • h- E corresponds to the stationary value for the specific enthalpy at the entrance to the evaporator heating surface 4
  • the value M output by the device 8 corresponds to the stationary setpoint for the feed water flow into the feed water preheating heating surface 2 and thus into the evaporator heating surface 4.
  • ⁇ h (Ll) x M (L1) ⁇ h (L) x M (L) corresponds to a stationary value for the heat flow into the evaporator heating surface 4.
  • the differentiator 17 reduces the setpoint value M for the feed water flow by a corresponding correction value as long as the power value L2 increases in time and the heating of the metal masses of the evaporator heating surface 4 reduces the heat flow which is in the mass flow in the evaporator heating surface 4 arrives, reduced.
  • the Differentiator 17, on the other hand increases the setpoint M by a corresponding correction value as long as the power value L2 drops in time and the cooling of the metal masses of the evaporator heating surface 4 increases the heat flow that enters the mass flow in the evaporator heating surface 4.
  • the output of the differentiating element 17 can also be connected positively to the other summing element 19, possibly via a normalizing element.
  • the differentiator 24 reduces the setpoint Ms for the feed water mass flow into the once-through steam generator by a correction value as long as the actual value h- E of the specific enthalpy at the inlet of the
  • the differentiator 24 increases the desired value M by a correction value as long as the actual value h- E falls in time.
  • the output of the differentiating element 24 can also be connected to the summing element 19 in a positive manner - possibly via a standardization element.
  • the differentiating element 24 can be a pure functional element with differentiating behavior. However, it can also include additional computing elements that modify the differentiating behavior.
  • the curves I in FIGS. 2 and 3 apply in the event that the output value M (L1) of the function generator unit 10 is the uncorrected setpoint M for the controller 6.
  • Curves II apply in the event that differentiators 17 and 24 are not present in the circuit according to FIG. 1, while curves III apply to the circuit corresponding to FIG. 1, but without differentiator 24.
  • Curves IV apply to the circuit according to FIG. 1.
  • the diagrams according to FIGS. 2 and 3 show that the complete circuit according to FIG. 1 with the curves IV is the cheapest, if there is an overshoot of the specific enthalpy h- A at the outlet of the evaporator heating surface 4 Avoid as much as possible.
  • an enthalpy correction controller 20 is also shown in broken lines, the input of which is connected to the output of a summing element 21.
  • This summing element 21 is supplied with the desired value h fl (L2) output at the output of the third function transmitter unit 12 and negatively with the actual value h- A of the specific enthalpy at the outlet of the evaporator heating surface 4.
  • This actual value h- A is measured with a measuring device 22 located in the outlet line of the evaporator heating surface 4.
  • the correction signal at the controller output is fed positively to the summing element 19 of the device 8.
  • This enthalpy correction controller 20 advantageously corrects the setpoint Ms "of the feed water flow in the Forced-flow steam generator when the measured actual value h- ft of the specific enthalpy at the outlet of the evaporator heating surface 4 as a result of external interference, such as fluctuations in the calorific value of the fuel supplied to the continuous-flow steam generator or changes in the fire situation in the combustion chamber of the continuous-flow steam generator, from the setpoint h ft (L2) deviates for the specific enthalpy at the outlet of the evaporator heating surface 4, which is emitted by the third function transmitter unit 12.

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)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

Un générateur de vapeur à circulation forcée comportant une surface de chauffage de vaporisation (4) possède un dispositif de réglage pour le chauffage qui est guidé par une valeur de consigne L affectée à la puissance du générateur de vapeur, ainsi qu'un dispositif de réglage (6) pour le débit massique de l'eau d'alimentation M dans la surface de chauffage (4) du vaporisateur. Pour éviter un dépassement de l'enthalpie spécifique à la sortie de la surface de chauffage (4) du vaporisateur, on superpose au dispositif de réglage de l'eau d'alimentation (6) un dispositif (8) qui sert à la formation de la grandeur Q(L1)/(hsA(L2) - hiE) en tant que valeur de consigne Ms pour le débit massique de l'eau d'alimentation. hiE représente l'enthalpie spécifique à l'entrée de la surface de chauffage (4) du vaporisateur, Q(L1) la valeur du courant de chaleur dans la surface de chauffage (4) du vaporisateur, valeur établie avec une première valeur de puissance L1 à partir d'un générateur de fonctions (10 à 14), et hsA(L2) la valeur de consigne de l'enthalpie spécifique à la sortie de la surface de chauffage (4) du vaporisateur, valeur établie avec une deuxième valeur de puissance L2 à partir du générateur de fonctions (10 à 14). L1 est une première valeur de puissance qui est retardée par rapport à la valeur de consigne L affectée à la puissance du générateur de vapeur et L2 est une deuxième valeur de puissance qui est retardée par rapport à la première valeur de puissance L1.
EP93908800A 1992-05-04 1993-04-21 Generateur de vapeur a circulation forcee Expired - Lifetime EP0639253B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93908800A EP0639253B1 (fr) 1992-05-04 1993-04-21 Generateur de vapeur a circulation forcee

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP92107500 1992-05-04
EP92107500 1992-05-04
DE19924217626 DE4217626A1 (de) 1992-05-27 1992-05-27 Zwangdurchlaufdampferzeuger
DE4217626 1992-05-27
PCT/DE1993/000344 WO1993022599A1 (fr) 1992-05-04 1993-04-21 Generateur de vapeur a circulation forcee
EP93908800A EP0639253B1 (fr) 1992-05-04 1993-04-21 Generateur de vapeur a circulation forcee

Publications (2)

Publication Number Publication Date
EP0639253A1 true EP0639253A1 (fr) 1995-02-22
EP0639253B1 EP0639253B1 (fr) 1996-12-11

Family

ID=25915217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93908800A Expired - Lifetime EP0639253B1 (fr) 1992-05-04 1993-04-21 Generateur de vapeur a circulation forcee

Country Status (8)

Country Link
US (1) US5529021A (fr)
EP (1) EP0639253B1 (fr)
JP (1) JP2563099B2 (fr)
KR (1) KR100251011B1 (fr)
CN (1) CN1044404C (fr)
DE (1) DE59304751D1 (fr)
DK (1) DK0639253T3 (fr)
WO (1) WO1993022599A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614962A1 (fr) 2004-07-09 2006-01-11 Siemens Aktiengesellschaft Méthode pour l'opération d'une chaudière à vapeur à passage unique
EP2065641A2 (fr) 2007-11-28 2009-06-03 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur en flux continu, ainsi que générateur de vapeur en flux à sens unique
EP2194320A1 (fr) 2008-06-12 2010-06-09 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à passage unique et générateur de vapeur à passage unique

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2152556C1 (ru) * 1995-03-16 2000-07-10 Сименс АГ Способ и устройство для контроля подачи питательной воды к парогенератору
EP2182278A1 (fr) * 2008-09-09 2010-05-05 Siemens Aktiengesellschaft Générateur de vapeur en continu
EP2180250A1 (fr) * 2008-09-09 2010-04-28 Siemens Aktiengesellschaft Générateur de vapeur en continu
DE102010040210A1 (de) * 2010-09-03 2012-03-08 Siemens Aktiengesellschaft Verfahren zum Betreiben eines solarbeheizten Durchlaufdampferzeugers sowie solarthermischer Durchlaufdampferzeuger
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
DE102011004269A1 (de) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Verfahren zum Betrieb eines solarthermischen Parabolrinnenkraftwerks
DE102011004277A1 (de) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Verfahren zum Betrieb eines direkt beheizten, solarthermischen Dampferzeugers
DE102011004263A1 (de) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Verfahren zum Betreiben eines solarbeheizten Abhitzedampferzeugers sowie solarthermischer Abhitzedampferzeuger
KR101818090B1 (ko) 2011-02-25 2018-01-12 지멘스 악티엔게젤샤프트 증기 터빈의 단기간 출력 상승의 조절 방법
FR2975797B1 (fr) * 2011-05-26 2020-01-24 Electricite De France Systeme de commande pour regulation multivariable de centrale thermique a flamme
DE102011076968A1 (de) * 2011-06-06 2012-12-06 Siemens Aktiengesellschaft Verfahren zum Betreiben eines Umlauf-Abhitzedampferzeugers
CN109780525B (zh) * 2016-08-31 2020-06-23 青岛科技大学 一种干燥机管束管径的控制方法
CN107356096B (zh) * 2016-08-31 2019-02-22 青岛科技大学 一种根据水位智能控制加热功率的蒸汽干燥机
CN109780521B (zh) * 2016-08-31 2020-05-19 青岛科技大学 一种智控干燥机管箱管径的设计方法
CN107356095B (zh) * 2016-08-31 2019-02-22 青岛科技大学 一种压力智能控制的蒸汽干燥机
EP3647657A1 (fr) * 2018-10-29 2020-05-06 Siemens Aktiengesellschaft Régulation de l'eau d'alimentation pour générateur de vapeur à récupération de chaleur à circulation forcée

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DE2118028A1 (de) * 1971-04-14 1973-03-15 Siemens Ag Verfahren und anordnung zur regelung an einem waermeaustauscher
DE3242968C2 (de) * 1982-11-20 1985-11-14 Evt Energie- Und Verfahrenstechnik Gmbh, 7000 Stuttgart Verfahren zur Regelung der Speisewasserzufuhr zu Dampferzeugern
DE59009015D1 (de) * 1990-01-31 1995-06-08 Siemens Ag Dampferzeuger.

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614962A1 (fr) 2004-07-09 2006-01-11 Siemens Aktiengesellschaft Méthode pour l'opération d'une chaudière à vapeur à passage unique
AU2005261689B2 (en) * 2004-07-09 2010-02-04 Siemens Aktiengesellschaft Process for operating a continuous steam generator
EP2065641A2 (fr) 2007-11-28 2009-06-03 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur en flux continu, ainsi que générateur de vapeur en flux à sens unique
US9482427B2 (en) 2007-11-28 2016-11-01 Siemens Aktiengesellschaft Method for operating a once-through steam generator and forced-flow steam generator
EP2194320A1 (fr) 2008-06-12 2010-06-09 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à passage unique et générateur de vapeur à passage unique
US9291345B2 (en) 2008-06-12 2016-03-22 Siemens Aktiengesellschaft Method for operating a continuous flow steam generator

Also Published As

Publication number Publication date
KR100251011B1 (ko) 2000-04-15
US5529021A (en) 1996-06-25
KR950701420A (ko) 1995-03-23
CN1086299A (zh) 1994-05-04
CN1044404C (zh) 1999-07-28
DK0639253T3 (da) 1997-06-16
DE59304751D1 (de) 1997-01-23
WO1993022599A1 (fr) 1993-11-11
JPH07502803A (ja) 1995-03-23
JP2563099B2 (ja) 1996-12-11
EP0639253B1 (fr) 1996-12-11

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