EP0639253B1 - Generateur de vapeur a circulation forcee - Google Patents
Generateur de vapeur a circulation forcee Download PDFInfo
- Publication number
- EP0639253B1 EP0639253B1 EP93908800A EP93908800A EP0639253B1 EP 0639253 B1 EP0639253 B1 EP 0639253B1 EP 93908800 A EP93908800 A EP 93908800A EP 93908800 A EP93908800 A EP 93908800A EP 0639253 B1 EP0639253 B1 EP 0639253B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- heating surface
- evaporator heating
- steam generator
- power
- 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
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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 once-through steam generator with an evaporator heating surface and with a device upstream of the evaporator heating surface for adjusting the feed water mass flow ⁇ 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 ⁇ and whose setpoint ⁇ S for the feed water mass flow depends on one of the Steam generator power assigned setpoint L is performed.
- the object of the invention is to substantially reduce or even avoid this disadvantageous overshoot of the specific enthalpy at the outlet of the evaporator heating surface.
- the processing of the actual value of the specific enthalpy at the entrance of the evaporator heating surface enables it to be used of the heat flow flowing into the evaporator heating surface for determining 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 control of the specific enthalpy at the outlet of the evaporator heating surface.
- the energy storage in the metal masses of the evaporator heating surface is taken into account, so that an even better adaptation of the feed water mass flow supplied to the evaporator heating surface takes place to the heat flow supplied to this evaporator heating surface.
- Figure 1 shows schematically a once-through steam generator according to the invention.
- FIGS. 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 FIG. 1 has a feed water preheating surface (economizer heating surface) 2, which is located in a gas train (not shown).
- This feed water preheating surface 2 has a feed water pump 3 connected upstream and an evaporator heating surface 4 connected downstream.
- a measuring device 9 for measuring the actual value h iE 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, namely a PI controller 6, at the input of which is the controlled variable the control deviation ⁇ of the feed water mass flow ⁇ i measured with the measuring device 5.
- the controller 6 is assigned a device 8 for forming the setpoint ⁇ s 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 iE 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 over and over again during operation and which is fed directly to the fuel controller in the combustion control circuit (not shown), 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 value L1 from.
- 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 ⁇ (L1) for the feed water mass flow appears at the output of the function transmitter unit 10, and a value ⁇ h (L1) for the difference between the specific enthalpy h iA at the outlet of the evaporator heating surface 4 and the specific enthalpy h iE am appears at the output of the function transmitter unit 11 Entry of this evaporator heating surface 4.
- the output variables ⁇ (L1) and ⁇ h (L1) 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 L1.
- This quantity Q ⁇ (L1) is entered as a counter in a divider 15.
- a setpoint h sA (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 1st 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 sA (L2) as a function of L2 are stored in the third function generator unit 12; they are determined from values for h sA , which were respectively obtained during a steady-state operation of the once-through steam generator and entered into the third function generator unit 12.
- the output of the second delay element 16 there can advantageously be the input of a differentiating element 17, the output of which is connected 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 - are located on a device 30 for measuring the actual value of the pressure p i 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).
- a function generator can also be connected between the input of the differentiating element 17 and such a device 30 for measuring the actual value of the pressure p i , which, for example, outputs the saturated steam temperature corresponding to the measured pressure p i to the differentiating element 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 iE 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 delay element 13 and L2 at the output of delay element 16 are thus also constant; they have the same value as the setpoint L.
- h iE corresponds to the stationary value for the specific enthalpy at the entrance to the evaporator heating surface 4
- the value ⁇ s given 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 4th
- the specific enthalpy h iA at the outlet of the evaporator heating surface 4 changes with a further delay when the heat flow into this evaporator heating surface 4 changes, which is taken into account by the second delay element 16 of the device 8 is.
- the differentiator 17 reduces the setpoint value ⁇ s for the feed water flow by a corresponding correction value as long as the power value L2 rises over time and the heating of the metal masses of the evaporator heating surface 4 reduces the heat flow that gets into the mass flow in the evaporator heating surface 4.
- the Differentiator 17, on the other hand increases the desired value ⁇ s 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 reaches the mass flow in the evaporator heating surface 4.
- the output of the differentiating element 17 can also be switched positively to the other summing element 19, possibly via a normalizing element.
- the differentiator 24 reduces the setpoint ⁇ s for the feed water mass flow into the once-through steam generator by a correction value as long as the actual value h iE of the specific enthalpy at the entrance to the evaporator heating surface 4 increases. On the other hand, the differentiator 24 increases the target value ⁇ s by a correction value as long as the actual value h iE 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 normalization 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 differentiation behavior.
- the curves I in FIGS. 2 and 3 apply in the event that the output value ⁇ (L1) of the function generator unit 10 is the uncorrected setpoint value ⁇ s for the controller 6.
- the curves II apply in the event that the differentiators 17 and 24 are not present in the circuit according to FIG. 1, while the curves III apply to the circuit corresponding to FIG. 1, but without the differentiator 24.
- the 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 it is important to avoid overshoot of the specific enthalpy h iA at the outlet of the evaporator heating surface 4 as far 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 sA (L2) output at the output of the third function generator unit 12 and negatively with the actual value h iA of the specific enthalpy at the outlet of the evaporator heating surface 4.
- This actual value h iA 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 target value ⁇ s of the feed water flow in the Forced-flow steam generator , if the measured actual value h iA of the specific enthalpy at the outlet of the evaporator heating surface 4 due to external interference, such as fluctuations in the calorific value of the fuel supplied to the continuous-flow steam generator or changes in the fire position in the combustion chamber of the continuous-flow steam generator , from the setpoint h sA (L2) for the specific enthalpy am Exit of the evaporator heating surface 4 deviates, which is emitted by the third function generator unit 12.
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- 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
Claims (8)
- Générateur de vapeur à circulation forcée comportant une surface (4) chauffante d'évaporateur et comportant un dispositif (3) de régulation, monté, par rapport au sens circulation, en amont de la surface (4) chauffante d'évaporateur, pour réguler le courant Ṁ massique d'eau d'alimentation passant dans la surface chauffante d'évaporateur, et comportant un dispositif (6) de régulation qui est associé à ce dispositif (3), dont la grandeur réglante est le courant Ṁ massique d'eau d'alimentation et dont on pilote la valeur Ṁs de consigne du courant massique d'eau d'alimentation en fonction d'une valeur L de consigne associée à la puissance du générateur de vapeur, caractérisé en ce qu'il est associé au dispositif (6) de régulation un dispositif (8) pour former la grandeurcomme valeur Ṁs de consigne du courant massique d'eau d'alimentation, et en ce qu'il peut être envoyé à ce dispositif (8), comme grandeurs d'entrée, la valeur hiE réelle de l'enthalpie spécifique à l'entrée de la surface (4) chauffante d'évaporateur et la valeur L de consigne associée à la puissance du générateur de vapeur,Q̇(L1) étant la valeur du courant calorifique passant dans la surface (4) chauffante d'évaporateur et prélevée pour une première valeur L1 de puissance d'un générateur (10, 11, 12, 14) de fonction suivant une fonction pouvant être prescrite de manière fixe,hsA(L2) étant la valeur de consigne de l'enthalpie spécifique à la sortie de la surface (4) chauffante prélevée pour une deuxième valeur L2 de puissance d'un générateur (10, 11, 12, 14) de fonction suivant une fonction pouvant être prescrite de manière fixe,la première valeur L1 de puissance étant une valeur de puissance retardée par l'intermédiaire d'un premier élément (13) de retardement, par rapport à la valeur L de consigne associée à la puissance du générateur de vapeur, et la deuxième valeur L2 de puissance étant une valeur de puissance retardée par l'intermédiaire d'un deuxième élément (16) de retardement, par rapport à la première valeur L1 de puissance.
- Générateur de vapeur à circulation forcée suivant la revendication 1, caractérisé en ce que le dispositif (8) pour former la grandeur
- Générateur de vapeur à circulation forcée suivant la revendication 1 ou 2, caractérisé en ce que le dispositif (8) pour former la grandeur
- Générateur de vapeur à circulation forcée suivant la revendication 1, 2 ou 3, caractérisé en ce qu'il est prévu un régulateur (20) de correction d'enthalpie, à l'entrée de régulateur duquel se trouve la grandeur (hsA(L2) - hiA) comme écart de régulation et à la sortie de régulateur duquel peut être fournie une valeur de correction, qui est additionnée à la différence (hsA(L2) - hiE), hiA étant la valeur réelle de l'enthalpie spécifique à la sortie de la surface (4) chauffante d'évaporateur.
- Générateur de vapeur à circulation forcée suivant une des revendications 1 à 4, caractérisé en ce que le générateur (10, 11, 12, 14) de fonction comprend une première unité (10) et une deuxième unité (11) de générateur de fonction, auxquelles est envoyée la première valeur L1 de puissance et dont les signaux (Ṁ(L1), Δh(L1)) de sortie sont envoyés à un élément (14) multiplicateur.
- Générateur de vapeur à circulation forcée suivant une des revendications 1 à 5, caractérisé en ce que le générateur (10, 11, 12, 14) de fonction comprend une troisième unité (12) de générateur de fonction, à laquelle est envoyée la deuxième valeur L2 de puissance et dont le signal (hsA(L2)) de sortie est envoyé à un élément (19) de sommation.
- Générateur de vapeur à circulation forcée suivant une des revendications 1 à 6, caractérisé en ce que le dispositif (8) comprend un élément (15) diviseur pour former la grandeur Ṁs.
- Générateur de vapeur à circulation forcée suivant une des revendications 1 à 7, caractérisé en ce qu'il est prévu un dispositif (5, 9, 22) de mesure pour détecter la valeur réelle de l'enthalpie spécifique à l'entrée et/ou à la sortie de la surface (4) chauffante d'évaporateur.
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 | ||
DE4217626 | 1992-05-27 | ||
DE19924217626 DE4217626A1 (de) | 1992-05-27 | 1992-05-27 | Zwangdurchlaufdampferzeuger |
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 EP0639253A1 (fr) | 1995-02-22 |
EP0639253B1 true 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 (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006005708A1 (fr) * | 2004-07-09 | 2006-01-19 | Siemens Aktiengesellschaft | Procede pour faire fonctionner un generateur de vapeur en continu |
DE102011004263A1 (de) * | 2011-02-17 | 2012-08-23 | Siemens Aktiengesellschaft | Verfahren zum Betreiben eines solarbeheizten Abhitzedampferzeugers sowie solarthermischer Abhitzedampferzeuger |
Families Citing this family (17)
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 |
EP2065641A3 (fr) * | 2007-11-28 | 2010-06-09 | 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 |
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 |
DE102011004277A1 (de) * | 2011-02-17 | 2012-08-23 | Siemens Aktiengesellschaft | Verfahren zum Betrieb eines direkt beheizten, solarthermischen Dampferzeugers |
DE102011004269A1 (de) * | 2011-02-17 | 2012-08-23 | Siemens Aktiengesellschaft | Verfahren zum Betrieb eines solarthermischen Parabolrinnenkraftwerks |
CN103492678B (zh) * | 2011-02-25 | 2016-03-09 | 西门子公司 | 用于调节汽轮机的短期的功率提高的方法 |
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 |
CN109780523B (zh) * | 2016-08-31 | 2020-06-30 | 青岛科技大学 | 一种壁面喷水的智能控制蒸汽干燥机 |
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 |
CN107356097B (zh) * | 2016-08-31 | 2019-02-22 | 青岛科技大学 | 一种智能温度控制的蒸汽干燥机 |
CN107356094B (zh) * | 2016-08-31 | 2019-02-22 | 青岛科技大学 | 一种蒸汽流量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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
EP0439765B1 (fr) * | 1990-01-31 | 1995-05-03 | Siemens Aktiengesellschaft | Générateur de vapeur |
-
1993
- 1993-04-21 DE DE59304751T patent/DE59304751D1/de not_active Expired - Lifetime
- 1993-04-21 EP EP93908800A patent/EP0639253B1/fr not_active Expired - Lifetime
- 1993-04-21 WO PCT/DE1993/000344 patent/WO1993022599A1/fr active IP Right Grant
- 1993-04-21 DK DK93908800.1T patent/DK0639253T3/da active
- 1993-04-21 JP JP5518820A patent/JP2563099B2/ja not_active Expired - Lifetime
- 1993-04-21 KR KR1019940703752A patent/KR100251011B1/ko not_active IP Right Cessation
- 1993-05-04 CN CN93106344A patent/CN1044404C/zh not_active Expired - Lifetime
-
1994
- 1994-11-04 US US08/334,421 patent/US5529021A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006005708A1 (fr) * | 2004-07-09 | 2006-01-19 | Siemens Aktiengesellschaft | Procede pour faire fonctionner un generateur de vapeur en continu |
US7624708B2 (en) | 2004-07-09 | 2009-12-01 | Siemens Aktiengesellschaft | Process for operating a continuous steam generator |
CN1906441B (zh) * | 2004-07-09 | 2010-06-16 | 西门子公司 | 直流式锅炉的运行方法 |
DE102011004263A1 (de) * | 2011-02-17 | 2012-08-23 | Siemens Aktiengesellschaft | Verfahren zum Betreiben eines solarbeheizten Abhitzedampferzeugers sowie solarthermischer Abhitzedampferzeuger |
Also Published As
Publication number | Publication date |
---|---|
JP2563099B2 (ja) | 1996-12-11 |
JPH07502803A (ja) | 1995-03-23 |
EP0639253A1 (fr) | 1995-02-22 |
DK0639253T3 (da) | 1997-06-16 |
CN1044404C (zh) | 1999-07-28 |
US5529021A (en) | 1996-06-25 |
KR950701420A (ko) | 1995-03-23 |
CN1086299A (zh) | 1994-05-04 |
WO1993022599A1 (fr) | 1993-11-11 |
DE59304751D1 (de) | 1997-01-23 |
KR100251011B1 (ko) | 2000-04-15 |
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