EP0643816B2 - Procede et dispositif visant a reguler la temperature des gaz brules a la sortie d'un generateur de vapeur - Google Patents

Procede et dispositif visant a reguler la temperature des gaz brules a la sortie d'un generateur de vapeur Download PDF

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Publication number
EP0643816B2
EP0643816B2 EP93907804A EP93907804A EP0643816B2 EP 0643816 B2 EP0643816 B2 EP 0643816B2 EP 93907804 A EP93907804 A EP 93907804A EP 93907804 A EP93907804 A EP 93907804A EP 0643816 B2 EP0643816 B2 EP 0643816B2
Authority
EP
European Patent Office
Prior art keywords
flue gas
steam generator
gas temperature
heating surface
sections
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
EP93907804A
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German (de)
English (en)
Other versions
EP0643816B1 (fr
EP0643816A1 (fr
Inventor
Georg Lösel
Reiner Engelhardt
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
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6460138&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0643816(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0643816A1 publication Critical patent/EP0643816A1/fr
Application granted granted Critical
Publication of EP0643816B1 publication Critical patent/EP0643816B1/fr
Publication of EP0643816B2 publication Critical patent/EP0643816B2/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
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F22D1/12—Control devices, e.g. for regulating steam temperature

Definitions

  • the invention relates to a method and a Device for adjusting the flue gas temperature at the outlet of one used in a smoldering furnace Steam generator, one for heat transfer between the flue gas and the feed water has usable heating surface, and the flue gas side a cleaning system is connected downstream.
  • a steam generator is by indirect Heat exchange between hot flue gas and feed water in a water-steam cycle steam, e.g. generated for a steam turbine.
  • the flue gas is burned by a fossil fuel in a combustion chamber of the smoldering plant (EP-PS 0 340 537).
  • the feed water flows along inside the steam generator one usually in the form of tubes or tube bundles trained heating surface and takes heat from the flue gas.
  • the cooled flue gas is at Exit from the steam generator first cleaned and then released into the environment via a fireplace.
  • Another method is called a part of the Flue gas bypassing the heating surface on The steam generator exits the cooled flue gas admixed so that a predetermined flue gas temperature can be observed.
  • the disadvantage is the provision of a voluminous flue gas bypass.
  • a temperature control is also due of strands that form when mixed extremely difficult.
  • the invention is therefore based on the object a particularly simple procedure for setting the Specify flue gas temperature.
  • the procedure are suitable for regulation in which a Lowering the flue gas temperature at the outlet of the Steam generator, which simultaneously enters a cleaning system is safely avoided below a minimum value is.
  • the simplest possible device with a high overall efficiency is achievable.
  • this object is achieved according to the invention solved in that the heat transfer depending on the effective heating surface used is changed by the flue gas temperature, where there is a deviation in the flue gas temperature from one above the minimum permissible flue gas temperature setpoint for flue gas cleaning one behind the other in the flow direction of the feed water arranged sections of the heating surface zuoder be switched off.
  • Flue gas temperature especially during part-load operation, when flowing in the opposite direction to the flue gas flow Feed water first the exit of the Steam generator nearest section of the heating surface off.
  • Flue gas temperatures With increasing lowering of the Flue gas temperatures are in the opposite direction Flow direction of the flue gas further sections switched off one after the other. This can be done again increasing smoke temperature in reverse order can be switched on in succession.
  • the object is achieved according to the invention solved by the fact that the flowing Heating water used heating surface depending on the flue gas temperature is controllable, the heating surface a number of individually switchable or switchable Includes sections in the flow direction of the Flue gas arranged one behind the other and from the feed water Can be flowed through in the opposite direction are.
  • Each section can have a Actuator connected.
  • Suite can Section expediently an entry collector at the entrance for collecting feed water.
  • the device advantageously comprises one connected on the output side to at least one actuator Controller whose input variable is the actual value of the Is the flue gas temperature.
  • the steam generator 1 shown in Figure 1 is, for. B. Part of a smoldering plant not shown. It comprises a combustion chamber 2, which has a Flue gas duct 3 is connected to a waste heat boiler 4. Within the waste heat boiler 4 are heating surfaces 5 in Form of tubes or tube bundles, e.g. hanging, arranged.
  • the steam generator 1 is on the output side via a Flue gas line 6 connected to a cleaning system 7.
  • the cleaning system 7 includes one Spray dryer B, to which a separator 9, e.g. an electro filter, and a wet cleaner 10 are connected downstream.
  • the Wet cleaner 10 is connected to the spray dryer via a line 11 8 connected.
  • the flue gas line 6 opens behind the cleaning system 7 in a chimney 12.
  • a temperature sensor 13 At the outlet of the steam generator 1 is a temperature sensor 13 provided, which is connected to a controller 14 is.
  • the controller 14 is on the output side with a Number of actuators designated as a whole by 15 connected in the form of valves 15a, 15b, 15c ( Figure 2).
  • the Actuators 15 the distribution of a line 30 in the steam generator 1 entering feed water S on an economizer heating surface that is used for preheating of the feed water S is influenced.
  • the flue gas R generated in the combustion chamber 2 is guided through the steam generator 1 along the arrows shown. In this case, heat is transferred from the hot flue gas R via the heating surfaces 5 to the feed water S flowing in a water-steam cycle of a steam turbine (not shown in more detail).
  • the cooled flue gas R leaving the steam generator 1 is cleaned in the cleaning system 7.
  • the flue gas temperature T i at the outlet of the steam generator 1 is still approximately 220 ° C. at full load.
  • the cleaning takes place inside the wet cleaner 10 by means of a washing liquid, the alkaline components, e.g. Sodium hydroxide.
  • the alkaline Form components with contained in the flue gas R. acidic, e.g. chlorine-containing substances as reaction products essentially salts.
  • the washing liquid is over along with the reaction products the line 11 is fed to the spray dryer 8. There will the washing liquid through contact with the flue gas R evaporates.
  • the dried at the same time as the evaporation Reaction products, i.e. essentially the Salts are separated in the filter 9.
  • the Flue gas R is in the cleaning system 7 on a Cooled temperature of about 70 ° C.
  • each is for preheating the Feed water S serving economizer heating surface 5 in a number of successive sections, preferably divided into three sections 20 to 22.
  • everyone the sections 20, 21 and 22 is both on the input side and on the output side with a collector 23, 24, 25 and 26 connected.
  • each of the sections 20 to 22 via the entry collectors 23, 24, 25 connected to one of the valves 15a, 15b and 15c.
  • the Valves 15a, 15b, 15c are connected to a common feed water line 30 connected.
  • the collector is 26 via a line 31 in a manner not shown and Way with the other heating surfaces 5 of the steam generator 1 connected.
  • the feed water S is conducted in countercurrent to the direction of flow of the flue gas R through meandering tube bundles 35, the walls of which form the heating surface 5.
  • the flue gas R is cooled, the valve 15a first being open and the valves 15b and 15c being closed.
  • the flue gas temperature T i drops at the outlet of the steam generator 1, the heating surface 5 effectively used for heat transfer is reduced.
  • valve 15b is first opened and valve 15a is closed.
  • the valve 15c then remains closed. If the flue gas temperature T i continues to drop, for example when the flue gas temperature T i has reached the value which is just permissible for trouble-free flue gas cleaning during partial load operation, the valve 15c is opened and the valve 15b is also closed.
  • the sections 20 and 21 of the heating surface 5 are then switched off and thus separated from the water-steam cycle.
  • the feed water S remains in the pipes 35 of the sections 20 and 21 which are not flowed through. Since the boiling temperature of the water is always higher than the flue gas temperature in this area of the waste heat boiler 4 under the prevailing pressure conditions, the sections 20, 21 of the heating surface 5 which are not flowed through cannot evaporate.
  • the heating surface 5 which is effectively used for heat transfer is increasingly increased.
  • the sections 20 and 21 of the heating surface 5, depending on the flue gas temperature T i at the outlet of the steam generator 1, are switched on again one after the other in the water-steam cycle by corresponding switching of the valves 15a, 15b, 15c.
  • the regulation takes place via the controller 14, which emits corresponding control signals to the valves 15a, 15b, 15c.
  • the control signals are derived from a comparison value, which is formed from a deviation of the measured flue gas temperature T i (actual value) from a target value T s .
  • the device for temperature control comprises therefore only short connecting lines on the feed water side between the feed water pipe 30 and at least two or more valves 15a, 15b, 15c.

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)
  • Chimneys And Flues (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Claims (6)

  1. Procédé destiné à la régulation de la température des gaz de fumée à la sortie d'un générateur de vapeur, qui comporte une surface de chauffe (5) pouvant être utilisée pour le transfert thermique entre les gaz de fumée (R) et l'eau d'alimentation (S), les gaz de fumée (R) refroidis étant épurés à la sortie du générateur de vapeur,
       caractérisé par le fait que la surface de chauffe (5) utilisée activement pour le transfert thermique est modifiée en fonction de la température (Ti) des gaz de fumée, des sections (20, 21, 22) de la surface de chauffe (5), disposées les unes derrière les autres dans le sens de la circulation de l'eau d'alimentation (S), étant à cet effet mises dans le circuit ou hors circuit si la température (Ti) des gaz de fumée s'écarte d'une valeur de consigne (Ts) qui est supérieure à la température minimale des gaz de fumée admissible pour l'épuration des gaz de fumée.
  2. Procédé selon la revendication 1,
       caractérisé par le fait que, lors d'un abaissement de la température (Ti) des gaz de fumée, la section (20) de la surface de chauffe (5) la plus proche de la sortie du générateur de vapeur (1), dans le sens de la circulation de l'eau d'alimentation (S) opposé au sens de circulation des gaz de fumée, est mise hors circuit en premier.
  3. Dispositif destiné à la régulation de la température (Ti) des gaz de fumée à la sortie d'un générateur de vapeur (1), en aval duquel est disposée du côté des gaz de fumée une installation d'épuration (7) des gaz de fumée, le générateur de vapeur (1) comportant une surface de chauffe (5) pouvant être utilisée pour le transfert thermique entre les gaz de fumée (R) et l'eau d'alimentation (S), la surface de chauffe (5) étant subdivisée en un nombre de sections (20, 21, 22), chaque section (20, 21, 22) pouvant être individuellement mise dans le circuit ou hors circuit,
       caractérisé par le fait que pour la mesure de la température (Ti) des gaz de fumée, il est prévu un capteur de température (13) à la sortie du générateur de vapeur (1) et par le fait qu'il est prévu un régulateur (14) de sorte que la surface de chauffe (S) utilisée par l'eau d'alimentation (S) en circulation peut être réglée en fonction de la température (Ti) des gaz de fumée.
  4. Dispositif selon la revendication 3,
       caractérisé par le fait que les sections (20, 21, 22) sont disposées les unes derrière les autres dans le sens de la circulation des gaz de fumée (R) et de l'eau d'alimentation (S) peut y passer successivement dans le sens opposé, chaque section (20, 21, 22) étant reliée du côté de l'entrée à un élément de régulation (15a, 15b, 15c).
  5. Dispositif selon la revendication 4,
       caractérisé par le fait que chaque section (20, 21, 22) comporte un collecteur d'entrée (23, 24 ou 25) destiné à la collecte d'eau d'alimentation (S).
  6. Dispositif selon la revendication 4 ou 5,
       caractérisé par un régulateur (14) qui, du côté de la sortie, est relié au moins à l'un des éléments de régulation (15), et dont la grandeur d'entrée est la valeur effective de la température (Ti) des gaz de fumée.
EP93907804A 1992-06-01 1993-04-19 Procede et dispositif visant a reguler la temperature des gaz brules a la sortie d'un generateur de vapeur Expired - Lifetime EP0643816B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4218016A DE4218016A1 (de) 1992-06-01 1992-06-01 Verfahren und Vorrichtung zur Regelung der Rauchgastemperatur am Austritt eines Dampferzeugers
DE4218016 1992-06-01
PCT/DE1993/000340 WO1993024790A1 (fr) 1992-06-01 1993-04-19 Procede et dispositif visant a reguler la temperature des gaz brules a la sortie d'un generateur de vapeur

Publications (3)

Publication Number Publication Date
EP0643816A1 EP0643816A1 (fr) 1995-03-22
EP0643816B1 EP0643816B1 (fr) 1996-10-16
EP0643816B2 true EP0643816B2 (fr) 2003-10-29

Family

ID=6460138

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93907804A Expired - Lifetime EP0643816B2 (fr) 1992-06-01 1993-04-19 Procede et dispositif visant a reguler la temperature des gaz brules a la sortie d'un generateur de vapeur

Country Status (6)

Country Link
EP (1) EP0643816B2 (fr)
JP (1) JPH07503530A (fr)
CN (1) CN1044403C (fr)
DE (2) DE4218016A1 (fr)
ES (1) ES2094536T5 (fr)
WO (1) WO1993024790A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0745807B1 (fr) * 1995-05-31 1999-07-14 Asea Brown Boveri Ag Chaudière à vapeur
FI970438A0 (fi) * 1996-12-19 1997-02-03 Kvaerner Pulping Oy Foerfarande i panna, saerskilt i sodapanna
DE10004187C5 (de) * 2000-02-01 2013-06-06 Siemens Aktiengesellschaft Verfahren zum Betreiben einer Gas- und Dampfturbinenanlage sowie danach arbeitende Anlage
US9297278B2 (en) 2011-05-27 2016-03-29 General Electric Company Variable feedwater heater cycle
JP5995685B2 (ja) * 2012-11-27 2016-09-21 クボタ環境サ−ビス株式会社 廃熱回収設備
DE102013211376B4 (de) * 2013-06-18 2015-07-16 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Regelung der Eindüsung von Wasser in den Rauchgaskanal einer Gas- und Dampfturbinenanlage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040719A (en) * 1952-04-21 1962-06-26 Bailey Meter Co Vapor generating and superheating systems
US3807364A (en) * 1972-07-20 1974-04-30 Westinghouse Electric Corp Mixing header
JPS5836243B2 (ja) * 1979-12-15 1983-08-08 工業技術院長 蒸気発生器
DE3344712C1 (de) * 1983-12-10 1985-04-18 Balcke-Dürr AG, 4030 Ratingen Dampferzeuger
DK154731C (da) * 1985-05-21 1989-05-08 Burmeister & Wains Energi Dampkedel med katalytisk roeggasbehandling samt fremgangsmaade ved drift af kedelen
JP2592061B2 (ja) * 1986-06-02 1997-03-19 バブコツク日立株式会社 排熱回収ボイラ
US4799461A (en) * 1987-03-05 1989-01-24 Babcock Hitachi Kabushiki Kaisha Waste heat recovery boiler

Also Published As

Publication number Publication date
DE59304208D1 (de) 1996-11-21
CN1044403C (zh) 1999-07-28
ES2094536T3 (es) 1997-01-16
WO1993024790A1 (fr) 1993-12-09
ES2094536T5 (es) 2004-07-01
EP0643816B1 (fr) 1996-10-16
CN1080040A (zh) 1993-12-29
JPH07503530A (ja) 1995-04-13
EP0643816A1 (fr) 1995-03-22
DE4218016A1 (de) 1993-12-02

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