[go: up one dir, main page]

EP0068301B2 - Steam generator with circulating atmospheric or supercharged fluidised-bed combustion - Google Patents

Steam generator with circulating atmospheric or supercharged fluidised-bed combustion Download PDF

Info

Publication number
EP0068301B2
EP0068301B2 EP82105260A EP82105260A EP0068301B2 EP 0068301 B2 EP0068301 B2 EP 0068301B2 EP 82105260 A EP82105260 A EP 82105260A EP 82105260 A EP82105260 A EP 82105260A EP 0068301 B2 EP0068301 B2 EP 0068301B2
Authority
EP
European Patent Office
Prior art keywords
steam generator
evaporator
fluidized bed
heating surface
generator according
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
EP82105260A
Other languages
German (de)
French (fr)
Other versions
EP0068301B1 (en
EP0068301A1 (en
Inventor
Karl-Heinz Maintok
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.)
Deutsche Babcock Anlagen AG
Original Assignee
Deutsche Babcock Anlagen 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6135797&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0068301(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Deutsche Babcock Anlagen AG filed Critical Deutsche Babcock Anlagen AG
Priority to AT82105260T priority Critical patent/ATE10673T1/en
Publication of EP0068301A1 publication Critical patent/EP0068301A1/en
Publication of EP0068301B1 publication Critical patent/EP0068301B1/en
Application granted granted Critical
Publication of EP0068301B2 publication Critical patent/EP0068301B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0084—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus with combustion in a fluidized bed with recirculation of separated solids or with cooling of the bed particles outside the combustion bed

Definitions

  • the invention relates to a steam generator with circulating atmospheric or pressure-charged fluidized bed combustion consisting of a fluidized bed combustion chamber, fluid bed cooler and waste heat steam generator, in which feed water preheater, evaporator, superheater and reheater heating surfaces are arranged, the entire evaporator heating surface being at least one of which is distributed over several partial surfaces Fluid bed cooler and is arranged in the vortex combustion chamber.
  • Methods for performing processes in a circulating atmospheric fluidized bed are e.g. known from DE-B No. 2539546 and DE-A No. 2624302. They offer the advantage that in addition to the combustion smoke gases, a second heat transfer medium, the internally and externally circulating bed material, is available for heat transfer purposes.
  • the entire evaporator heating surface is in the vortex combustion chamber, in which the superheater, the intermediate superheater and the feed water preheater are connected to the vortex combustion chamber on the gas side, as well as in the fluid bed coolers (the other superheaters) 60), 1980, pp. 366-376, picture 12).
  • the invention is based on a steam generator of the type mentioned at the outset. It is based on the task of improving this steam generator by means of a special design of the evaporator which permits advantageous regulation of the steam generator.
  • the heating surfaces of the steam generator according to the invention can be flowed through according to the natural circulation, forced circulation or forced circulation principle.
  • the design and distribution of the evaporator heating surfaces is carried out in such a way that the cooling and the stability of the flow are guaranteed and that temperature imbalances are avoided by unfavorable distribution of the water / steam mixture.
  • the advantages associated with the invention are that the lowest partial loads of the steam generator are possible.
  • the steam generator can be regulated well by dividing the entire evaporator heating surface into two or more heating surfaces. Any deviations in the heat absorption of the evaporator heating surfaces can be easily corrected either by subsequently changing the solids supply to the fluid bed cooler or by enlarging or reducing the easily accessible heating surfaces in the fluid bed cooler.
  • FIG. 1 and 2 show the system diagram of a steam generator according to the invention with circulating fluidized bed combustion.
  • the steam generator comprises a vortex combustion chamber 1, to which a coal / lime mixture is supplied via a line 2 and primary combustion air is supplied via floor nozzles 3 or lateral injection.
  • the coal / lime mixture can also be blown in directly by means of a primary air stream.
  • secondary combustion air is added via side nozzles 18.
  • the solids discharged with the gas from the vortex combustion chamber 1, which is essentially ash, are separated in a recycle cyclone 4.
  • the return cyclone 4 is followed by two parallel solid lines 5 and 6, which open into the fluidized bed combustion chamber 1.
  • a fluid bed cooler 7 is provided in the one solid line 6, and a control element 8 is arranged in front of the solid inlet.
  • the separated solids are fed to the fluidized-bed combustion chamber 1 either directly via the solids line 5 or via the fluidized bed cooler 7. Via the control member 8, the k through the fluidized bed 5 ühler flowing solid amount can be adjusted.
  • the gas emerging from the recycle cyclone 4 is fed to a heat recovery steam generator 9 after flowing through a further separator (not shown).
  • feed water preheaters 10 and superheaters 11 are arranged as secondary heating surfaces.
  • the total evaporator heating surface of the steam generator is distributed over two partial surfaces, one of which is housed as a heating surface 13 in the fluidized bed cooler 7 and the other as a heating surface 12 in the fluidized bed combustion chamber 1.
  • This heating surface 12 can be designed as a bundle heating surface which is immersed in the fluidized bed.
  • the heating surface 12 can be represented by the cooled tube walls of the swirl combustion chamber.
  • the heating surface 12 arranged in the vortex combustion chamber 1 is switched as the first evaporator and with the feed water preheater 10 connected.
  • the size of the evaporator partial heating surface, through which the heating surface 12 flows, is designed for the required low load of the steam generator in such a way that cooling and stability are guaranteed, and temperature imbalances due to unfavorable distribution of the water / steam mixture in the tubes of the heating surface 12 are avoided .
  • the necessary evaporation energy is transmitted solely via the heating surface 12.
  • the heat transfer surface necessary for full load beyond the low load is accommodated as heating surface 13 in the fluid bed cooler 7.
  • the heating surface 13 can be designed as a tube bundle or as a gas-tight welded tube wall. The size of this heating surface 13 can be reduced or enlarged in a simple manner by removing or adding a heating surface.
  • the heating surface 13 flows through in the fluidized bed cooler 7 without heat being transferred.
  • bypass lines 19 the evaporator heating surfaces can be modified independently of one another.
  • the steam generated in the heating surface 12 of the fluidized bed combustion chamber 1 reaches the superheater 11 after flowing through the heating surface 13 of the fluidized bed cooler 7. The steam thus overheated is fed to a high-pressure turbine, not shown.
  • the fluidized bed cooler 7 is provided in its bottom with a connection 14 for the supply of a fluidizing gas.
  • the solid entering the fluid bed cooler 7 when the control element 8 is open is fluidized by the cas and can transfer its heat to the heating surface 13.
  • the heat to be transferred to the heating surface 13 is regulated by the amount of the solid matter in such a way that the amount of solid matter increases as the load on the steam generator increases and decreases as the load decreases. This means that all areas between low load and full load can be set.
  • the heating surfaces 12, 13 of the evaporator are connected in series. This series connection is used when the steam generator is operated according to the forced flow principle.
  • FIG. 2 also shows the case in which a further partial evaporator heating surface is provided as heating surface 20 in the waste heat steam generator 9.
  • This possibility is particularly considered when a low-calorific coal is burned in the swirl combustion chamber 1.
  • Another recycling cyclone 15 with solid lines 5 and 6 is arranged symmetrically to the recycling cyclone 4 described.
  • the solid separated in the further recycle cyclone 15 is fed to a second fluid bed cooler 16, which is operated independently of the fluid bed cooler 7 described.
  • the heating surfaces can be arranged for a single or double reheat 17.
  • the temperature of the reheated steam is controlled solely by the amount of solid supplied. The temperature control required by conventional steam generators by injecting water into the steam can thus be dispensed with.
  • the invention has been explained on the basis of a circulating atmospheric fluidized bed combustion. However, it can also be used for a circulating, pressure-charged fluidized bed furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The total evaporator heating surface of a steam generator with circulating atmospheric or pressurized turbulent layer firing is distributed over several partial surfaces which are arranged in a turbulence-type combustion chamber (1) in a flow-bed cooler (7) or in a waste-heat steam generator (9). The partial surface through which flow takes place first, is dimensioned for the required low-load operation of the steam generator. The steam generator is so regulated that during increasing load of the steam generator the flow-bed cooler (7) receives an increasing quantity of solids, and during sinking load it receives a decreasing quantity of solids.

Description

Die Erfindung betrifft einen Dampferzeuger mit zirkulierender atmosphärischer oder druckaufgeladener Wirbelschichtfeuerung bestehend aus Wirbelbrennkammer, Fliessbettkühlern und Abhitzedampferzeuger, in denen Speisewasservorwärmer-, Verdampfer-, Überhitzer- und Zwischenüberhitzerheizflächen angeordnet sind, wobei die gesamte Verdampferhelzfläche auf mehrere Teilflächen verteilt ist, von denen wenigstens eine in dem Fliessbettkühler und in der Wirbelbrennkammer angeordnet ist.The invention relates to a steam generator with circulating atmospheric or pressure-charged fluidized bed combustion consisting of a fluidized bed combustion chamber, fluid bed cooler and waste heat steam generator, in which feed water preheater, evaporator, superheater and reheater heating surfaces are arranged, the entire evaporator heating surface being at least one of which is distributed over several partial surfaces Fluid bed cooler and is arranged in the vortex combustion chamber.

Verfahren zur Durchführung von Prozessen in einer zirkulierenden atmosphärischen Wirbelschicht sind z.B. aus der DE-B Nr. 2539546 und der DE-A Nr. 2624302 bekannt. Sie bieten den Vorteil, dass neben den Verbrennungsrauchgasen ein zweites Wärmeträgermedium, das intern und extern umlaufende Bettmaterial, zu Wärmeübertragungszwecken zur Verfügung steht.Methods for performing processes in a circulating atmospheric fluidized bed are e.g. known from DE-B No. 2539546 and DE-A No. 2624302. They offer the advantage that in addition to the combustion smoke gases, a second heat transfer medium, the internally and externally circulating bed material, is available for heat transfer purposes.

Bei einem Dampferzeuger mit einer zirkulierenden Wirbelschicht unter Atmosphärendruck sind in der Wirbelbrennkammer die gesamte Verdampferheizfläche, in dem sich an die Wirbelbrennkammer gasseitig anschliessenden Abhitzedampferzeuger die Überhitzer, die Zwischenüberhitzer und die Speisewasservorwärmer sowie in den Fliessbettkühlern die weiteren Überhitzer und Zwischenüberhitzer untergebracht ("VGB Kraftwerkstechnik" (60), 1980, S. 366-376, Bild 12).In the case of a steam generator with a circulating fluidized bed under atmospheric pressure, the entire evaporator heating surface is in the vortex combustion chamber, in which the superheater, the intermediate superheater and the feed water preheater are connected to the vortex combustion chamber on the gas side, as well as in the fluid bed coolers (the other superheaters) 60), 1980, pp. 366-376, picture 12).

Die Erfindung geht von einem Dampferzeuger der eingangs genannten Art aus. Ihr liegt die Aufgabe zugrunde, diesen Dampferzeuger durch eine besondere, eine vorteilhafte Regelung des Dampferzeugers zulassende Ausbildung des Verdampfers zu verbessern.The invention is based on a steam generator of the type mentioned at the outset. It is based on the task of improving this steam generator by means of a special design of the evaporator which permits advantageous regulation of the steam generator.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die rohrseitig zuerst durchströmte Teilfläche der Verdampferheizfläche auf die geforderte Schwachlast des Dampferzeugers ausgelegt ist und die über die Schwachlast bis zur Vollast hinausgehende Verdampfungsenergie durch die übrigen Teilflächen übertragen wird.This object is achieved according to the invention in that the partial surface of the evaporator heating surface through which the pipe flows first is designed for the required low load of the steam generator and the evaporation energy which goes beyond the low load up to full load is transmitted through the other partial surfaces.

Bei einem derart ausgebildeten Dampferzeuger ist eine Regelung in der Weise möglich, dass die in den Fliessbettkühlern angeordneten Heizflächen bei steigender Last mit einer zunehmenden Menge und bei sinkender Last mit einer abnehmenden Menge an im Kreislauf geführten Feststoff aus der Wirbelschicht beaufschlagt werden. Die Heizflächen des erfindungsgemässen Dampferzeugers können nach dem Naturumlauf-, dem Zwangsumlauf- oder nach dem Zwangdurchlaufprinzip durchströmt sein. Die konstruktive Ausführung und Verteilung der Verdampferheizflächen wird derart vorgenommen, dass die Kühlung und die Stabilität der Strömung gewährleistet sind und dass Schieflagen der Temperatur durch ungünstige Verteilung des Wasser/Dampf-Gemisches vermieden werden.With a steam generator designed in this way, regulation is possible in such a way that the heating surfaces arranged in the fluidized bed coolers are subjected to an increasing amount as the load increases and with a decreasing amount of circulating solid matter from the fluidized bed as the load decreases. The heating surfaces of the steam generator according to the invention can be flowed through according to the natural circulation, forced circulation or forced circulation principle. The design and distribution of the evaporator heating surfaces is carried out in such a way that the cooling and the stability of the flow are guaranteed and that temperature imbalances are avoided by unfavorable distribution of the water / steam mixture.

Die mit der Erfindung verbundenen Vorteile liegen darin, dass niedrigste Teillasten des Dampferzeugers möglich sind. Durch die Aufteilung der gesamten Verdampferheizfläche auf zwei oder mehr Teilheizflächen kann der Dampferzeuger gut geregelt werden. Etwaige Abweichungen in der Wärmeaufnahme der Verdampferheizflächen können leicht korrigiert werden, indem entweder nachträglich die Feststoffzufuhr zu dem Fliessbettkühler verändert wird oder indem die gut zugänglichen Heizflächen im Fliessbettkühler vergrössert oder verkleinert werden.The advantages associated with the invention are that the lowest partial loads of the steam generator are possible. The steam generator can be regulated well by dividing the entire evaporator heating surface into two or more heating surfaces. Any deviations in the heat absorption of the evaporator heating surfaces can be easily corrected either by subsequently changing the solids supply to the fluid bed cooler or by enlarging or reducing the easily accessible heating surfaces in the fluid bed cooler.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert.Several embodiments of the invention are shown in the drawing and are explained in more detail below.

Fig. 1 und 2 zeigen das Anlagenschema je eines erfindungsgemässen Dampferzeugers mit zirkulierender Wirbelschichtfeuerung.1 and 2 show the system diagram of a steam generator according to the invention with circulating fluidized bed combustion.

Der Dampferzeuger umfasst eine Wirbelbrennkammer 1, der über eine Leitung 2 ein Kohle/Kalk-Gemisch und über Bodendüsen 3 oder seitliche Einblasung Primärverbrennungsluft zugeführt werden. Das Kohle/Kalk-Gemisch kann auch mittels eines Primärluftstromes direkt eingeblasen werden. Oberhalb der Gemischeinbringung erfolgt über Seitendüsen 18 die Zugabe von Sekundärverbrennungsluft.The steam generator comprises a vortex combustion chamber 1, to which a coal / lime mixture is supplied via a line 2 and primary combustion air is supplied via floor nozzles 3 or lateral injection. The coal / lime mixture can also be blown in directly by means of a primary air stream. Above the introduction of the mixture, secondary combustion air is added via side nozzles 18.

Die mit dem Gas aus der Wirbelbrennkammer 1 ausgetragenen Feststoffe, das ist im wesentlichen Asche, werden in einem Rückführungszyklon 4 abgeschieden. An den Rückführungszyklon 4 schliessen sich zwei parallelgeschaltete Feststoffleitungen 5 und 6 an, die in die Wirbelschichtbrennkammer 1 münden. In der einen Feststoffleitung 6 ist ein Fliessbettkühler 7 vorgesehen, vor dessen Feststoffeintritt ein Regelorgan 8 angeordnet ist. Die abgeschiedenen Feststoffe werden entweder direkt über die Feststoffleitung 5 oder über den Fliessbettkühler 7 der Wirbelbrennkammer 1 zugeführt. Über das Regelorgan 8 kann die durch den Fliessbettkühler 5 fliessende Feststoffmenge eingestellt werden.The solids discharged with the gas from the vortex combustion chamber 1, which is essentially ash, are separated in a recycle cyclone 4. The return cyclone 4 is followed by two parallel solid lines 5 and 6, which open into the fluidized bed combustion chamber 1. A fluid bed cooler 7 is provided in the one solid line 6, and a control element 8 is arranged in front of the solid inlet. The separated solids are fed to the fluidized-bed combustion chamber 1 either directly via the solids line 5 or via the fluidized bed cooler 7. Via the control member 8, the k through the fluidized bed 5 ühler flowing solid amount can be adjusted.

Das aus dem Rückführungszyklon 4 austretende Gas wird nach Durchströmen eines weiteren, nicht dargestellten Abscheiders einem Abhitzedampferzeuger 9 zugeführt. In dem Abhitzedampferzeuger 9 sind als Nachschaltheizflächen Speisewasservorwärmer 10 und Überhitzer 11 angeordnet.The gas emerging from the recycle cyclone 4 is fed to a heat recovery steam generator 9 after flowing through a further separator (not shown). In the waste heat steam generator 9, feed water preheaters 10 and superheaters 11 are arranged as secondary heating surfaces.

Die Gesamtverdampferheizfläche des Dampferzeugers ist nach Fig. 1 auf zwei Teilflächen verteilt, von denen eine als Heizfläche 13 in dem Fliessbettkühler 7 und die andere als Heizfläche 12 in der Wirbelbrennkammer 1 untergebracht sind. Diese Heizfläche 12 kann als Bündelheizfläche ausgebildet sein, die in die Wirbelschicht eintaucht. Die Heizfläche 12 kann durch die gekühlten Rohrwände der Wirbelbrennkammer dargestellt sein.1, the total evaporator heating surface of the steam generator is distributed over two partial surfaces, one of which is housed as a heating surface 13 in the fluidized bed cooler 7 and the other as a heating surface 12 in the fluidized bed combustion chamber 1. This heating surface 12 can be designed as a bundle heating surface which is immersed in the fluidized bed. The heating surface 12 can be represented by the cooled tube walls of the swirl combustion chamber.

Nach Fig. 1 ist die in der Wirbelbrennkammer 1 angeordnete Heizfläche 12 als erster Verdampfer geschaltet und mit dem Speisewasservorwärmer 10 verbunden. Die Grösse der zuerst durchströmten Verdampferteilheizfläche, also der Heizfläche 12, ist auf die geforderte Schwachlast des Dampferzeugers derart ausgelegt, dass Kühlung und Stabilität gewähneistet sind, und Schieflagen der Temperatur durch ungünstige Verteilung des Wasser/Dampf-Gemisches in den Rohren der Heizfläche 12 vermieden werden. Im Schwachlastfall wird die notwendige Verdampfungsenergie allein über die Heizfläche 12 übertragen.According to FIG. 1, the heating surface 12 arranged in the vortex combustion chamber 1 is switched as the first evaporator and with the feed water preheater 10 connected. The size of the evaporator partial heating surface, through which the heating surface 12 flows, is designed for the required low load of the steam generator in such a way that cooling and stability are guaranteed, and temperature imbalances due to unfavorable distribution of the water / steam mixture in the tubes of the heating surface 12 are avoided . In the event of a low load, the necessary evaporation energy is transmitted solely via the heating surface 12.

Die für Vollast über die Schwachlast hinaus notwendige Wärmeübertragungsfläche ist als Heizfläche 13 in dem Fliessbettkühler 7 untergebracht. Die Heizfläche 13 kann als Rohrbündel oder als gasdicht verschweisste Rohrwand ausgebildet sein. Die Grösse dieser Heizfläche 13 kann durch Entfernen oder durch Hinzufügen von Heizfläche in einfacher Weise verkleinert oder vergrössert werden. Bei Schwachlast ist die Heizfläche 13 im Fliessbettkühler 7 durchströmt, ohne dass Wärme übertragen wird. Durch die Anordnung von Bypassleitungen 19 können die Verdampferheizflächen unabhängig voneinander modifiziert werden. Der in der Heizfläche 12 der Wirbelschichtbrennkammer 1 erzeugte Dampf gelangt nach Durchströmen der Heizfläche 13 des Fliessbettkühlers 7 in den Überhitzer 11. Der so überhitzte Dampf wird einer nicht dargestellten Hochdruckturbine zugeführt.The heat transfer surface necessary for full load beyond the low load is accommodated as heating surface 13 in the fluid bed cooler 7. The heating surface 13 can be designed as a tube bundle or as a gas-tight welded tube wall. The size of this heating surface 13 can be reduced or enlarged in a simple manner by removing or adding a heating surface. When the load is low, the heating surface 13 flows through in the fluidized bed cooler 7 without heat being transferred. By arranging bypass lines 19, the evaporator heating surfaces can be modified independently of one another. The steam generated in the heating surface 12 of the fluidized bed combustion chamber 1 reaches the superheater 11 after flowing through the heating surface 13 of the fluidized bed cooler 7. The steam thus overheated is fed to a high-pressure turbine, not shown.

Der Fliessbettkühler 7 ist in seinem Boden mit einem Anschluss 14 für die Zuführung eines Fluidisierungsgases versehen. Der bei geöffnetem Regelorgan 8 in den Fliessbettkühler 7 gelangende Feststoff wird durch das Cas fluidisiertund kann seine Wärme auf die Heizfläche 13 übertragen. Die auf die Heizfläche 13 zu übertragende Wärme wird durch die Menge des Feststoffes in der Weise geregelt: bei steigender Last des Dampferzeugers wird die Feststoffmenge erhöht und bei sinkender Last verringert. Damit können alle Bereiche zwischen Schwachlast und Vollast eingestellt werden.The fluidized bed cooler 7 is provided in its bottom with a connection 14 for the supply of a fluidizing gas. The solid entering the fluid bed cooler 7 when the control element 8 is open is fluidized by the cas and can transfer its heat to the heating surface 13. The heat to be transferred to the heating surface 13 is regulated by the amount of the solid matter in such a way that the amount of solid matter increases as the load on the steam generator increases and decreases as the load decreases. This means that all areas between low load and full load can be set.

Nach Fig. 1 sind die Heizflächen 12, 13 des Verdampfers hintereinander geschaltet. Diese Serienschaltung wird dann angewendet, wenn der Dampferzeuger nach dem Zwangsdurchlaufprinzip betrieben wird.1, the heating surfaces 12, 13 of the evaporator are connected in series. This series connection is used when the steam generator is operated according to the forced flow principle.

In der Fig. 2 ist der gleiche Dampferzeuger dargestellt, jedoch sind in diesem Fall die Verdampferteilheizflächen parallel geschaltet. Diese Parallelschaltung wird insbesondere bei einem Betrieb des Dampferzeugers nach dem Naturumlauf- oder dem Zwangsumlaufprinzip vorzusehen sein.2 shows the same steam generator, but in this case the evaporator heating surfaces are connected in parallel. This parallel connection will have to be provided in particular when the steam generator is operated according to the natural circulation or forced circulation principle.

In die Fig. 2 ist auch der Fall eingezeichnet, bei dem eine weitere Verdampferteilheizfläche als Heizfläche 20 in dem Abhitzedampferzeuger 9 vorgesehen ist. Diese Möglichkeit kommt insbesondere dann in Betracht, wenn eine heizwertarme Kohle in derWirbelbrennkammer 1 verbrannt wird. Unter Einschluss dieser Heizfläche 20 können beim Vorhandensein von zwei Verdampferteilheizflächen diese zusätzlich zu der in Fig. 1 dargestellten Möglichkeit auch in der Wirbelbrennkammer 1 und dem Abhitzedampferzeuger 9 oder in dem Kühler 7 und dem Abhitzedampferzeuger 9 angeordnet sein. Es ist auch möglich, drei Verdampferteilheizflächen vorzusehen und je eine in der Wirbelbrennkammer 1, dem Kühler 7 und dem Abhitzedampferzeuger 9 anzuordnen.2 also shows the case in which a further partial evaporator heating surface is provided as heating surface 20 in the waste heat steam generator 9. This possibility is particularly considered when a low-calorific coal is burned in the swirl combustion chamber 1. Including this heating surface 20, in the presence of two partial evaporator heating surfaces, these can also be arranged in the swirl combustion chamber 1 and the heat recovery steam generator 9 or in the cooler 7 and the heat recovery steam generator 9 in addition to the possibility shown in FIG. 1. It is also possible to provide three partial evaporator heating surfaces and to arrange one each in the vortex combustion chamber 1, the cooler 7 and the heat recovery steam generator 9.

Symmetrisch zu dem beschriebenen Rückführungszyklon 4 ist ein weiterer Rückführungszyklon 15 mit Feststoffleitungen 5 und 6 angeordnet. Der in dem weiteren Rückführungszyklon 15 abgeschiedene Feststoff wird einem zweiten Fliessbettkühler 16 zugeführt, der unabhängig von dem beschriebenen Fliessbettkühler 7 betrieben wird. In dem zweiten Fliessbettkühler 16 können die Heizflächen für eine einfache oder zweifache Zwischenüberhitzung 17 angeordnetsein. DieTemperaturdeszwischenüberhitzten Dampfes wird allein durch die Menge des zugeführten Feststoffes geregelt. Die bei herkömmlichen Dampferzeugern notwendige Temperaturregelung durch Wassereinspritzung in den Dampf kann dadurch entfallen.Another recycling cyclone 15 with solid lines 5 and 6 is arranged symmetrically to the recycling cyclone 4 described. The solid separated in the further recycle cyclone 15 is fed to a second fluid bed cooler 16, which is operated independently of the fluid bed cooler 7 described. In the second fluidized bed cooler 16, the heating surfaces can be arranged for a single or double reheat 17. The temperature of the reheated steam is controlled solely by the amount of solid supplied. The temperature control required by conventional steam generators by injecting water into the steam can thus be dispensed with.

Die Erfindung ist an Hand einer zirkulierenden atmosphärischen Wirbelschichtfeuerung erläutert worden. Sie kann aber auch für eine zirkulierende druckaufgeladene Wirbelschichtfeuerung angewendet werden.The invention has been explained on the basis of a circulating atmospheric fluidized bed combustion. However, it can also be used for a circulating, pressure-charged fluidized bed furnace.

Claims (6)

1. Steam generator with circulating atmospheric or pressurized fluidized bed combustion system consisting of fluidized bed combustor (1), entrained bed coolers (7, 16) and waste heat steam generator (9) in which feedwater heater (10), evaporator (12, 13), superheater (11) and reheater (17) heating surfaces are arranged, the complete evaporator heating surface (12, 13) being divided into several surface sections of which at least one is arranged in the entrained bed cooler (7) and in the fluidized bed combustor (1), characterized in that the surface section of the evaporator surface through whose tubes the medium passes first is designed for the required low load and that the energy of evaporation exceeding the low load up to full load is transferred by the other surface sections (13).
2. Steam generator according to Claim 1, characterized in that another surface section (20) of the evaporator surface is arranged in the waste heat steam generator (9).
3. Steam generator according to Claims 1 or 1 and 2, characterized in that - when operating the steam generator on the once-through forced flow principle - the surface sections of the evaporator heating surface are arranged in series with regard to the medium flowing through the tubes.
4. Steam generator according to Claims 1 or 1 and 2, characterized in that - when operating the steam generator on the natural circulation or once-through forced flow principle - the surface sections of the evaporator heating surface are connected in parallel with regard to the medium flowing through the tubes.
5. Steam generator according to one or several of Claims 1 to 4, characterized in that a bypass line (19) capable of being shut off is arranged in parallel to each of the surface sections (12, 13, 20) of the evaporator surfaces.
6. Steam generator according to one or several of Claims 1 to 5, characterized in that in one of the entrained bed coolers (16) exclusively heating surfaces for single or double reheat (17) are arranged.
EP82105260A 1981-07-01 1982-06-16 Steam generator with circulating atmospheric or supercharged fluidised-bed combustion Expired - Lifetime EP0068301B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105260T ATE10673T1 (en) 1981-07-01 1982-06-16 CIRCULATING ATMOSPHERIC OR PRESSURIZED FLUID-BED FIRED STEAM GENERATOR AND METHODS FOR ITS CONTROL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813125849 DE3125849A1 (en) 1981-07-01 1981-07-01 STEAM GENERATOR WITH CIRCULATING ATMOSPHERIC OR PRESSURE-CHARGED FLUEL BURN FIRING AND METHOD FOR ITS REGULATION
DE3125849 1981-07-01

Publications (3)

Publication Number Publication Date
EP0068301A1 EP0068301A1 (en) 1983-01-05
EP0068301B1 EP0068301B1 (en) 1984-12-05
EP0068301B2 true EP0068301B2 (en) 1991-09-04

Family

ID=6135797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105260A Expired - Lifetime EP0068301B2 (en) 1981-07-01 1982-06-16 Steam generator with circulating atmospheric or supercharged fluidised-bed combustion

Country Status (8)

Country Link
US (1) US4473032A (en)
EP (1) EP0068301B2 (en)
AT (1) ATE10673T1 (en)
AU (1) AU553068B2 (en)
CA (1) CA1190815A (en)
DE (2) DE3125849A1 (en)
DK (1) DK150166C (en)
ZA (1) ZA824034B (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672918A (en) * 1984-05-25 1987-06-16 A. Ahlstrom Corporation Circulating fluidized bed reactor temperature control
EP0206066B1 (en) * 1985-06-12 1993-03-17 Metallgesellschaft Ag Circulating fluid-bed combustion device
US4665864A (en) * 1986-07-14 1987-05-19 Foster Wheeler Energy Corporation Steam generator and method of operating a steam generator utilizing separate fluid and combined gas flow circuits
DE3625373A1 (en) * 1986-07-26 1988-02-04 Steinmueller Gmbh L & C STEAM GENERATOR WITH CIRCULATING ATMOSPHERICAL OR PRESSURE-CHARGED FLUEL BURN FIRING, AND METHOD FOR ITS REGULATION
US4709663A (en) * 1986-12-09 1987-12-01 Riley Stoker Corporation Flow control device for solid particulate material
DE3642396A1 (en) * 1986-12-11 1988-06-16 Siemens Ag STEAM GENERATOR SYSTEM WITH A CIRCULATING FLUID BED
SE457015B (en) * 1987-03-25 1988-11-21 Abb Stal Ab POWER PLANT WITH FLUIDIZED BOTTOM PREPARATION
US4761131A (en) * 1987-04-27 1988-08-02 Foster Wheeler Corporation Fluidized bed flyash reinjection system
US4733621A (en) * 1987-05-08 1988-03-29 A. Ahlstrom Corporation Apparatus and methods for operating a fluidized bed reactor
US4777889A (en) * 1987-05-22 1988-10-18 Smith Richard D Fluidized bed mass burner for solid waste
JPH0629652B2 (en) * 1987-07-13 1994-04-20 株式会社荏原製作所 Combustion control device in fluidized bed boiler
DE3800863A1 (en) * 1988-01-14 1989-07-27 Metallgesellschaft Ag METHOD FOR CONTROLLING THE PRODUCTION OF STEAM IN A COMBUSTION PLANT
DK120288D0 (en) * 1988-03-04 1988-03-04 Aalborg Boilers FLUID BED COMBUSTION REACTOR AND METHOD FOR OPERATING A FLUID BED COMBUSTION REACTOR
JPH0642941B2 (en) * 1988-11-02 1994-06-08 フォスター・ホイーラー・エナージイ・コーポレイション Fluidized bed reactor with integrated recycle heat exchanger and method of operating same
CA2045571C (en) * 1989-01-24 1995-09-12 Ponnusami K. Gounder System and method for reheat steam temperature control in circulating fluidized bed boilers
US4947804A (en) * 1989-07-28 1990-08-14 Foster Wheeler Energy Corporation Fluidized bed steam generation system and method having an external heat exchanger
SE9000603D0 (en) * 1990-02-20 1990-02-20 Abb Stal Ab SETTING AND DEVICE TO REGULATE POWER OUTLETS FROM SPRING BURNING
US5273000A (en) * 1992-12-30 1993-12-28 Combustion Engineering, Inc. Reheat steam temperature control in a circulating fluidized bed steam generator
FI945737A7 (en) * 1994-12-05 1996-06-06 Ahlstroem Oy Method for controlling the superheat temperature of steam in a circulating bed type gas cooler
FI970438A0 (en) 1996-12-19 1997-02-03 Kvaerner Pulping Oy Foerfarande i panna, saerskilt i sodapanna
US5784975A (en) * 1996-12-23 1998-07-28 Combustion Engineering, Inc. Control scheme for large circulating fluid bed steam generators (CFB)
FR2767379B1 (en) * 1997-08-18 1999-11-12 Gec Alsthom Stein Ind EXTERNAL DENSE FLUIDIZED BED BOILER
FI20010676A0 (en) * 2001-04-02 2001-04-02 Einco Oy CSC reactor
AU2018438149B2 (en) 2018-08-24 2022-07-21 Sumitomo SHI FW Energia Oy An arrangement for and a method of controlling flow of solid particles and a fluidized bed reactor
CN114688546B (en) * 2021-12-29 2023-01-10 浙江大学 Hot ash returning flow control device and method capable of achieving lateral air distribution and achieving double adjustment of bed temperature and steam temperature

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682139A (en) * 1971-06-15 1972-08-08 Paul A B Sahm Anti-pollution system for solid fuel-fired steam generating power plants
US4165717A (en) * 1975-09-05 1979-08-28 Metallgesellschaft Aktiengesellschaft Process for burning carbonaceous materials
DE2624302C2 (en) * 1976-05-31 1987-04-23 Metallgesellschaft Ag, 6000 Frankfurt Methods for carrying out exothermic processes
CH637184A5 (en) * 1979-04-12 1983-07-15 Sulzer Ag COMBINED THERMAL POWER PLANT WITH A GAS TURBINE GROUP.

Also Published As

Publication number Publication date
AU553068B2 (en) 1986-07-03
AU8504482A (en) 1983-01-06
EP0068301B1 (en) 1984-12-05
DE3125849C2 (en) 1988-10-27
ZA824034B (en) 1983-04-27
US4473032A (en) 1984-09-25
EP0068301A1 (en) 1983-01-05
DK150166B (en) 1986-12-22
ATE10673T1 (en) 1984-12-15
DK294282A (en) 1983-01-02
CA1190815A (en) 1985-07-23
DE3125849A1 (en) 1983-01-20
DE3261455D1 (en) 1985-01-17
DK150166C (en) 1987-11-09

Similar Documents

Publication Publication Date Title
EP0068301B2 (en) Steam generator with circulating atmospheric or supercharged fluidised-bed combustion
DE69422313T2 (en) Combined power plant with steam and combustion gas turbines
DE69307930T2 (en) COMBINED POWER PLANT WITH AN ATMOSPHERICALLY CIRCULATING FLUID BED BOILER WITH A CARBURETOR
DE3783088T2 (en) STEAM GENERATOR AND ITS OPERATION WITH SEPARATE FLUID CIRCUITS AND COMMON GAS FLOW.
EP0206066B1 (en) Circulating fluid-bed combustion device
DE68911165T2 (en) System and method for power generation with an integrated gas turbine.
EP0591163B1 (en) Combined gas and steam turbine plant
EP0037858B1 (en) Steam power station with pressure-fired fluidised bed steam generator
DE69519891T2 (en) Pressure fluidized bed furnace with integrated recirculation heat exchanger
DE3517987A1 (en) METHOD AND DEVICE FOR CONTROLLING THE FUNCTION OF A FLUIDIZED BED REACTOR WITH A CIRCULATING FLUIDED LAYER
DE3625373A1 (en) STEAM GENERATOR WITH CIRCULATING ATMOSPHERICAL OR PRESSURE-CHARGED FLUEL BURN FIRING, AND METHOD FOR ITS REGULATION
DE69002758T2 (en) SYSTEM AND METHOD FOR CONTROLLING THE TEMPERATURE OF THE STEAM IN CIRCULATING FLUID BEDS.
EP0474622A1 (en) Starting method for a stream-generating heat exchanger system and heat exchanger system for generating steam
EP0339185B1 (en) Steam generator for burning brown coal with different compositions
DE69521248T2 (en) Combined power plant with a pressure reactor with a circulating fluidized bed
DE69312372T2 (en) Water tube boiler with a fluidized bed
EP0086261A1 (en) Combination of a gas-turbine and steam-turbine cycle
EP0840837B1 (en) Process for running a gas and steam turbine plant and plant run by this process
DD296542A5 (en) FIRE, ESPECIALLY SWITCHING
DE3644083A1 (en) STEAM GENERATOR
EP0098481B1 (en) Method for generating electric power in a combined power plant with fluidised bed combustion
DE69605035T2 (en) COMBINED POWER PLANT WITH REACTOR WITH CIRCULATING FLOWER LAYER
EP0274637B1 (en) Steam generator with a circulating fluidised bed
DE3142993A1 (en) METHOD AND DEVICE FOR PREHEATING A PRESSURE FLUID BED COMBUSTION CHAMBER AND A CLEANING SUBSYSTEM IN A GAS TURBINE POWER PLANT
DE68902394T2 (en) FUEL SYSTEM FOR COMBUSTION OF FUEL IN A FLUIDIZED BED AT OVERPRESSURE.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19830127

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT DE FR GB IT NL SE

REF Corresponds to:

Ref document number: 10673

Country of ref document: AT

Date of ref document: 19841215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3261455

Country of ref document: DE

Date of ref document: 19850117

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: METALLGESELLSCHAFT AG

Effective date: 19850903

NLR1 Nl: opposition has been filed with the epo

Opponent name: METALLGESELLSCHAFT AG

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19910904

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): AT DE FR GB IT NL SE

ET3 Fr: translation filed ** decision concerning opposition
NLR2 Nl: decision of opposition
ITF It: translation for a ep patent filed
NLR3 Nl: receipt of modified translations in the netherlands language after an opposition procedure
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19930602

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930630

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19940616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19950101

EAL Se: european patent in force in sweden

Ref document number: 82105260.2

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000524

Year of fee payment: 19

Ref country code: DE

Payment date: 20000524

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20000526

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000606

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010617

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010630

EUG Se: european patent has lapsed

Ref document number: 82105260.2

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20010616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020228

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO