EP0037858B1 - Steam power station with pressure-fired fluidised bed steam generator - Google Patents

Steam power station with pressure-fired fluidised bed steam generator Download PDF

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Publication number
EP0037858B1
EP0037858B1 EP80200338A EP80200338A EP0037858B1 EP 0037858 B1 EP0037858 B1 EP 0037858B1 EP 80200338 A EP80200338 A EP 80200338A EP 80200338 A EP80200338 A EP 80200338A EP 0037858 B1 EP0037858 B1 EP 0037858B1
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Prior art keywords
flue gas
bypass
flow
steam
line
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EP80200338A
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German (de)
French (fr)
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EP0037858A1 (en
Inventor
Tadeusz Dipl.-Ing. Zaba
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Priority to DE8080200338T priority Critical patent/DE3066241D1/en
Priority to EP80200338A priority patent/EP0037858B1/en
Priority to US06/245,075 priority patent/US4380147A/en
Publication of EP0037858A1 publication Critical patent/EP0037858A1/en
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    • 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 of dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of 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 of 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
    • 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 of dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0015—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type

Definitions

  • the present invention relates to a steam power plant with a pressure-fired steam generator with fluid bed combustion according to the preamble of claim 1.
  • a major disadvantage of such steam generators is that, due to the high temperature, the tubes in the fluidized bed are exposed to the corrosive attack of the combustion gases and therefore have to be replaced in a relatively short time.
  • a steam generator is known from DE-A No. 2424394, in which all heating surfaces are arranged outside the region of the fluidized bed.
  • This steam generator is designed in a modular design, with fluidized beds distributed over the entire height of the boiler at equal intervals, each with its own heating surface in the form of tube bundles.
  • temperature control which has to intervene in particular in the fluidized bed where the heat concentration is greatest, is not dealt with here. This factor is of particular importance for the practical operation of a steam generator, which is why temperature control forms an important part of the present invention.
  • present steam power plant with pressure-fired steam generator defined in the characterizing part of patent claim 1, is intended to meet high demands with regard to good efficiency and economical operation.
  • the combustion air is supplied to a steam generator 1 from a charging group 2 under pressure, for example 8 to 10 bar, via a main air line 3 in various ways.
  • the charging group 2 consists of a gas turbine 4 driven by the flue gases of the steam generator with an open circuit, a compressor 5 rigidly coupled to the gas turbine and a starting motor 6 which is used to start up and which is uncoupled after the stationary operating state of the system has been reached.
  • An air supply line 7 branches off from line 3, through which air is conveyed under a perforated inflow floor 8, which forms the moving bed grate.
  • the air flowing through acts as a carrier stream for the fuel particles, which are kept in suspension and form the fluidized bed.
  • a further part of the combustion air is branched off from the line 7 through a cooling air line 9 and directed at 10 into a cooling air space delimited by the outer jacket 11 and inner jacket 12 of the steam generator, from which it exits through slots 13 provided under the inflow floor 8 in the inner jacket 12 under the inflow floor.
  • the ash discharge device 14, the coal feed device 15 and the additive feed device 16, with which an additive, such as limestone or dolomite, for admixing the sulfur compounds in a known manner, are symbolically indicated on the left side of the steam generator 1.
  • the fluidized bed is designated 17.
  • the flue gases flow in sequence through the pre-evaporator tube bundle 18, a superheater tube bundle 19 and an evaporator tube bundle 20.
  • the steam collector 21 is arranged after the evaporator tube bundle 20 in the flow direction of the boiler water outside the flue gas draft.
  • the steam excreted in the steam collector 21 passes into the superheater tube bundle 19 and further through a steam line 22 into a steam turbine 24 of a steam turbine generator group 23, the generator 25 of which supplies the mains current.
  • the exhaust steam from the turbine 24 reaches a condenser 26, from which a feed water pump 27 conveys the condensate into the pre-evaporator heating bundle 18.
  • a bypass flue gas duct is provided, which is separated from the flue gas duct by partition walls 28, 29 and 30, which form three short ducts.
  • a bypass flow control flap 31, 32 and 33 in each of these channels make it possible to control or regulate the flue gas flow through the individual sections of the flue gas flue with the three steam heating surfaces 18, 19 and 20 individually or in combination, and thus in cooperation with others described below Control units fine-tune the steam output and the temperature of the flue gases after the boiler to the respective requirements.
  • the flue gases pass from the steam generator 1 through a flue gas discharge line 34 into a cyclone dust separator 35, in which a large part of the unburned dust-like components is separated out. These are discharged with part of the flue gases via a dust return line 36 into an injector 37, which blows them into the fluidized bed through a dust introduction line 38.
  • a part of the remaining, partially dedusted flue gas passes into a bypass control circuit, consisting of a flue gas bypass line 39, 40, a flue gas bypass flap 41, a flue gas cooler 42 and a fan 43.
  • a flue gas bypass line 39, 40 a flue gas bypass flap 41, a flue gas cooler 42 and a fan 43.
  • the flap 41 When the flap 41 is open, the flue gas from the fan 43 is partly injected into the injector 37 via line 38 into the fluidized bed and partly into promoted a flue gas / air mixer 44.
  • flue gas is mixed with combustion air branched off from line 3 in such a ratio and introduced through line 45 under the fluidized bed, so that the fluidized bed temperature is kept at an optimal value in connection with the other control options.
  • the main coolant for the flue gas cooler 42 is water, this being due to the relatively high flue gas temperature, e.g. can still be 500 ° C to generate steam, e.g. Working or heating steam or also for overheating the turbine steam can be used.
  • a secondary bypass line 46 branches off from the flue gas bypass line 39, 40 in front of the flue gas bypass flap 41, in which a secondary bypass control flap 47 is provided and which opens into the bypass line 40 in front of the fan 43, via which the main part of the flue gas bypass branched off for temperature control in the fluidized bed normally flows flows.
  • the steam output can be varied or varied within a wide range . be managed.
  • the heating surfaces of the steam system will become soiled relatively quickly due to the high dust content of the flue gases after the fluidized bed, so that a cleaning device must also be provided for this system, for example based on the principle of tapping or shot peening.
  • the means with which the objectives of the invention are achieved thus consist of the three control flaps 31, 32, 33 in the steam generator, the flue gas bypass lines 39, 40, 46 and the flaps 41, 47 provided in these lines, as well as the cooler 42 and the fan 43.
  • the position of the flaps, the coolant flow through the cooler and the delivery capacity of the fan mean that the fluidized bed can be kept at an allowable temperature by avoiding the disadvantages that the cooling pipes laid in the fluidized bed entail, and by keeping heat away in the cooler42 adapt the heat transferred in the steam boiler to the steam output required.

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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)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Description

Die vorliegende Erfindung betrifft ein Dampfkraftwerk mit druckgefeuertem Dampferzeuger mit Fliessbettfeuerung nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a steam power plant with a pressure-fired steam generator with fluid bed combustion according to the preamble of claim 1.

Bei den meisten der bekannten druckgefeuerten Dampferzeuger mit Fliessbettfeuerung wird die Verbrennungswärme grösstenteils auf die in der Wirbelschicht der Fliessbettfeuerung liegenden Wasserrohre übertragen, um eine Kühlung der Wirbelschicht und die optimale Verbrennungstemperatur zu erhalten.In most of the known pressure-fired steam generators with fluidized bed combustion, the heat of combustion is largely transferred to the water pipes in the fluidized bed of the fluidized bed combustion in order to maintain cooling of the fluidized bed and the optimal combustion temperature.

Ein grosser Nachteil solcher Dampferzeuger liegt darin, dass infolge der hohen Temperatur die in der Wirbelschicht liegenden Rohre dem korrosiven Angriff der Verbrennungsgase ausgesetzt sind und daher in verhältnismässig kurzer Zeit erneuert werden müssen.A major disadvantage of such steam generators is that, due to the high temperature, the tubes in the fluidized bed are exposed to the corrosive attack of the combustion gases and therefore have to be replaced in a relatively short time.

Statt durch solche in die Wirbelschicht verlegte Kühlrohre kann die Verbrennungswärme der Wirbelschicht auch durch einen erhöhten Luftdurchsatz entzogen werden. Dies bringt aber den Nachteil mit sich, dass dann die Turbine der Ladegruppe ein grösseres Rauchgasvolumen zu verarbeiten hat und die Ladegruppe ebenso wie der Filter dementsprechend grösser dimensioniert werden müssen.Instead of such cooling pipes laid in the fluidized bed, the heat of combustion from the fluidized bed can also be removed by increasing the air flow. However, this has the disadvantage that the turbine of the charging group then has to process a larger flue gas volume and the charging group and the filter must accordingly be dimensioned larger.

Aus der DE-A Nr. 2424394 ist ein Dampferzeuger bekannt, bei dem alle Heizflächen ausserhalb des Bereiches der Wirbelschicht angeordnet sind. Dieser Dampferzeuger ist in Modulbauweise konzipiert, wobei über die ganze Höhe des Kessels in gleichen Abständen verteilt Wirbelbette vorgesehen sind, denen je eine eigene Heizfläche in Form von Rohrbündeln zugeordnet ist. Auf das Problem der Temperaturregelung, die insbesondere schon in der Wirbelschicht eingreifen muss, wo die Wärmekonzentration am grössten ist, wird dabei jedoch nicht eingegangen. Für den praktischen Betrieb eines Dampferzeugers ist dieser Faktor aber von besonderer Bedeutung, weshalb u.a. die Temperaturregelung einen wichtigen Bestandteil der vorliegenden Erfindung bildet.A steam generator is known from DE-A No. 2424394, in which all heating surfaces are arranged outside the region of the fluidized bed. This steam generator is designed in a modular design, with fluidized beds distributed over the entire height of the boiler at equal intervals, each with its own heating surface in the form of tube bundles. However, the problem of temperature control, which has to intervene in particular in the fluidized bed where the heat concentration is greatest, is not dealt with here. This factor is of particular importance for the practical operation of a steam generator, which is why temperature control forms an important part of the present invention.

Darüber hinaus soll das vorliegende, im kennzeichnenden Teil des Patentanspruchs 1 definierte Dampfkraftwerk mit druckgefeuertem Dampferzeuger hohe Ansprüche in bezug auf guten Wirkungsgrad und wirtschaftlichen Betrieb erfüllen.In addition, the present steam power plant with pressure-fired steam generator, defined in the characterizing part of patent claim 1, is intended to meet high demands with regard to good efficiency and economical operation.

Die Erfindung wird im folgenden unter Bezugnahme auf das in der Zeichnung dargestellte Ausführungsbeispiel näher beschrieben.The invention is described below with reference to the embodiment shown in the drawing.

Einem Dampferzeuger 1 wird die Verbrennungsluft von einer Ladegruppe 2 unter Druck, beispielsweise 8 bis 10 bar, über eine Lufthauptleitung 3 auf verschiedenen Wegen zugeführt. Die Ladegruppe 2 besteht aus einer von den Rauchgasen des Dampferzeugers angetriebenen Gasturbine 4 mit offenem Kreislauf, einem mit der Gasturbine starr gekuppelten Verdichter 5 und einem zum Anfahren dienenden Startmotor 6, der nach Erreichen des stationären Betriebszustandes der Anlage abgekuppelt wird.The combustion air is supplied to a steam generator 1 from a charging group 2 under pressure, for example 8 to 10 bar, via a main air line 3 in various ways. The charging group 2 consists of a gas turbine 4 driven by the flue gases of the steam generator with an open circuit, a compressor 5 rigidly coupled to the gas turbine and a starting motor 6 which is used to start up and which is uncoupled after the stationary operating state of the system has been reached.

Von der Leitung 3 zweigt eine Luftzuführleitung 7 ab, durch die Luft unter einen gelochten Anströmboden 8 gefördert wird, der den Fliessbettrost bildet. Die durchströmende Luft wirkt als Trägerstrom für die Brennstoffpartikel, die damit in Schwebe gehalten werden und die Wirbelschicht bilden. Ein weiterer Teil der Verbrennungsluft wird aus der Leitung 7 durch eine Kühlluftleitung 9 abgezweigt und bei 10 in einen vom Aussenmantel 11 und Innenmantel 12des Dampferzeugers begrenzten Kühlluftraum geleitet, aus dem sie durch unterhalb des Anströmbodens 8 im Innenmantel 12 vorgesehene Schlitze 13 unter dem Anströmboden austritt.An air supply line 7 branches off from line 3, through which air is conveyed under a perforated inflow floor 8, which forms the moving bed grate. The air flowing through acts as a carrier stream for the fuel particles, which are kept in suspension and form the fluidized bed. A further part of the combustion air is branched off from the line 7 through a cooling air line 9 and directed at 10 into a cooling air space delimited by the outer jacket 11 and inner jacket 12 of the steam generator, from which it exits through slots 13 provided under the inflow floor 8 in the inner jacket 12 under the inflow floor.

Symbolisch angedeutet sind an der linken Seite des Dampferzeugers 1 die Aschenaustrageinrichtung 14, die Kohlezuführeinrichtung 15 und die Additivzuführeinrichtung 16, mit der in bekannter Weise der Kohlenwirbelschicht ein Zusatz, wie beispielsweise Kalkstein oder Dolomit, zur Neutralisierung der Schwefelverbindungen beigemischt wird. Die Wirbelschicht ist mit 17 bezeichnet.The ash discharge device 14, the coal feed device 15 and the additive feed device 16, with which an additive, such as limestone or dolomite, for admixing the sulfur compounds in a known manner, are symbolically indicated on the left side of the steam generator 1. The fluidized bed is designated 17.

Die Rauchgase durchströmen im Kesselzug der Reihe nach ein Vorverdampferrohrbündel 18, ein Überhitzerrohrbündel 19 und ein Verdampferrohrbündel 20. Der Dampfsammler 21 ist ausserhalb des Rauchgaszuges in Flussrichtung des Kesselwassers nach dem Verdampferrohrbündel 20 angeordnet. Der im Dampfsammler 21 ausgeschiedene Dampf gelangt in das Überhitzerrohrbündel 19 und weiter durch eine Dampfleitung 22 in eine Dampfturbine 24 einer Dampfturbogeneratorgruppe 23, deren Generator 25 den Netzstrom liefert. Der Abdampf aus der Turbine 24 gelangt in einen Kondensator 26, aus dem eine Speisewasserpumpe 27 das Kondensat in das Vorverdampferheizbündel 18 fördert.The flue gases flow in sequence through the pre-evaporator tube bundle 18, a superheater tube bundle 19 and an evaporator tube bundle 20. The steam collector 21 is arranged after the evaporator tube bundle 20 in the flow direction of the boiler water outside the flue gas draft. The steam excreted in the steam collector 21 passes into the superheater tube bundle 19 and further through a steam line 22 into a steam turbine 24 of a steam turbine generator group 23, the generator 25 of which supplies the mains current. The exhaust steam from the turbine 24 reaches a condenser 26, from which a feed water pump 27 conveys the condensate into the pre-evaporator heating bundle 18.

Parallel zum Rauchgaszug, in dem sich die drei Dampfheizflächen 18,19, 20 befinden, ist ein Nebenstromrauchgaskanal vorgesehen, der gegenüber dem Rauchgaszug durch Trennwände 28, 29 und 30 separiert ist, die drei kurze Kanäle bilden. Je eine Nebenstromregelklappe 31,32 und 33 in diesen Kanälen ermöglichen es, den Rauchgasstrom durch die einzelnen Abschnitte des Rauchgaszuges mit den drei Dampfheizflächen 18, 19 und 20 einzeln oder kombiniert feinstufig zu steuern oder zu regeln und damit im Zusammenwirken mit weiteren, im folgenden beschriebenen Regelorganen die Dampfleistung sowie die Temperatur der Rauchgase nach dem Kessel dem jeweiligen Bedarf feinstufig anzupassen.Parallel to the flue gas duct, in which the three steam heating surfaces 18, 19, 20 are located, a bypass flue gas duct is provided, which is separated from the flue gas duct by partition walls 28, 29 and 30, which form three short ducts. A bypass flow control flap 31, 32 and 33 in each of these channels make it possible to control or regulate the flue gas flow through the individual sections of the flue gas flue with the three steam heating surfaces 18, 19 and 20 individually or in combination, and thus in cooperation with others described below Control units fine-tune the steam output and the temperature of the flue gases after the boiler to the respective requirements.

Aus dem Dampferzeuger 1 gelangen die Rauchgase durch eine Rauchgasableitung 34 in einen Zyklonstaubabscheider 35, in dem ein grosser Teil der unverbrannten staubförmigen Bestandteile ausgeschieden wird. Diese werden mit einem Teil der Rauchgase über eine Staubrückführleitung 36 in einen Injektor 37 abgeführt, der sie durch eine Staubeinführleitung 38 in die Wirbelschicht einbläst.The flue gases pass from the steam generator 1 through a flue gas discharge line 34 into a cyclone dust separator 35, in which a large part of the unburned dust-like components is separated out. These are discharged with part of the flue gases via a dust return line 36 into an injector 37, which blows them into the fluidized bed through a dust introduction line 38.

Vom restlichen, teilentstaubten Rauchgas gelangt ein Teil weiter in einen Nebenstromregelkreis, bestehend aus einer Rauchgasnebenstromleitung 39, 40, einer Rauchgasnebenstromklappe 41, einem Rauchgaskühler 42 und einem Ventilator 43. Bei offener Klappe 41 wird das Rauchgas vom Ventilator 43 teils in den Injektor 37 zur erwähnten Staubeinblasung über die Leitung 38 in die Wirbelschicht und teils in einen Rauchgas/Luft-Mischer 44 gefördert. In letzterem wird Rauchgas mit aus der Leitung 3 abgezweigter Verbrennungsluft in einem solchen Verhältnis gemischt und durch eine Leitung 45 unter das Fliessbett eingeführt, so dass die Wirbelschichttemperatur in Verbindung mit den anderen Regelungsmöglichkeiten auf einem jeweils optimalen Wert gehalten wird.A part of the remaining, partially dedusted flue gas passes into a bypass control circuit, consisting of a flue gas bypass line 39, 40, a flue gas bypass flap 41, a flue gas cooler 42 and a fan 43. When the flap 41 is open, the flue gas from the fan 43 is partly injected into the injector 37 via line 38 into the fluidized bed and partly into promoted a flue gas / air mixer 44. In the latter, flue gas is mixed with combustion air branched off from line 3 in such a ratio and introduced through line 45 under the fluidized bed, so that the fluidized bed temperature is kept at an optimal value in connection with the other control options.

Als Kühlmittel für den Rauchgaskühler 42 kommt hauptsächlich Wasser in Frage, wobei dieses wegen der verhältnismässig hohen Rauchgastemperatur, die z.B. noch 500° C betragen kann, zur Erzeugung von Dampf, z.B. Arbeits- oder Heizdampf oder aber auch zur Überhitzung des Turbinendampfes, verwendet werden kann.The main coolant for the flue gas cooler 42 is water, this being due to the relatively high flue gas temperature, e.g. can still be 500 ° C to generate steam, e.g. Working or heating steam or also for overheating the turbine steam can be used.

Von der Rauchgasnebenstromleitung 39, 40 zweigt vor der Rauchgasnebenstromklappe 41 eine sekundäre Nebenstromleitung 46 ab, in der eine sekundäre Nebenstromregelklappe 47 vorgesehen ist und die vor dem Ventilator 43 in die Nebenstromleitung 40 mündet, über die normalerweise der Hauptteil des für die Temperaturregelung im Wirbelbett abgezweigten Rauchgasnebenstromes fliesst.A secondary bypass line 46 branches off from the flue gas bypass line 39, 40 in front of the flue gas bypass flap 41, in which a secondary bypass control flap 47 is provided and which opens into the bypass line 40 in front of the fan 43, via which the main part of the flue gas bypass branched off for temperature control in the fluidized bed normally flows flows.

Mit den zwei vorerwähnten Nebenstromregelkreisen und den drei Nebenstromregelklappen 31, 32 und 33 im Dampferzeuger 1 sowie durch entsprechende Dosierung der in den Injektor 37 und in den Rauchgas/Luft-Mischer 44 abzuzweigenden abgekühlten Rauchgase bzw. Verbrennungsluft kann die Dampfleistung in einem weiten Bereich variiert bzw. geregelt werden.With the two aforementioned bypass flow control circuits and the three bypass flow control valves 31, 32 and 33 in the steam generator 1 and by appropriate metering of the cooled flue gases or combustion air to be branched off into the injector 37 and the flue gas / air mixer 44, the steam output can be varied or varied within a wide range . be managed.

Der Teil der Rauchgase, der hinter dem Zyklonabscheider 35 nach der Abzweigung der Leitung 39 noch übrigbleibt, naturgemäss der Hauptteil der im Dampferzeuger 1 gebildeten Rauchgase, gelangt nach Passieren eines Elektrofilters 48, aus dem der dort abgeschiedene Reststaub durch eine Staubableitung 49 entfernt wird, über eine Turbinenrauchgaszuleitung 50 zur Arbeitsleistung in die Gasturbine 4.The part of the flue gases that remains behind the cyclone separator 35 after the branching of the line 39, naturally the main part of the flue gases formed in the steam generator 1, passes over an electrostatic filter 48, from which the residual dust separated there is removed by a dust discharge line 49 a turbine smoke gas supply line 50 for work performance in the gas turbine 4.

Wie bei allen Dampferzeugern mit Fliessbettfeuerung werden die Heizflächen des Dampfsystems infolge des hohen Staubgehalts der Rauchgase nach der Wirbelschicht verhältnismässig rasch verschmutzen, so dass auch für diese Anlage eine Reinigungseinrichtung, beispielsweise nach dem Prinzip des Abklopfens oder Kugelstrahlens, vorgesehen werden muss.As with all steam generators with fluid bed firing, the heating surfaces of the steam system will become soiled relatively quickly due to the high dust content of the flue gases after the fluidized bed, so that a cleaning device must also be provided for this system, for example based on the principle of tapping or shot peening.

Die Mittel, mit denen die Ziele der Erfindung erreicht werden, bestehen also aus den drei Regelklappen 31,32,33 im Dampferzeuger, den Rauchgasnebenstromleitungen 39, 40, 46 und den in diesen Leitungen vorgesehenen Klappen 41, 47 sowie dem Kühler 42 und dem Ventilator 43. Durch die Stellung der Klappen, den Kühlmitteldurchfluss durch den Kühler und die Förderleistung des Ventilators lässt sich die Wirbelschicht unter Vermeidung der Nachteile, die in der Wirbelschicht verlegte Kühlrohre mit sich bringen, durch die Wärmeabfuhr im Kühler42 auf einer zulässigen Temperatur halten und die auf die Heizflächen im Dampfkessel übertragene wärme der jeweils erforderlichen Dampfleistung optimal anpassen.The means with which the objectives of the invention are achieved thus consist of the three control flaps 31, 32, 33 in the steam generator, the flue gas bypass lines 39, 40, 46 and the flaps 41, 47 provided in these lines, as well as the cooler 42 and the fan 43.The position of the flaps, the coolant flow through the cooler and the delivery capacity of the fan mean that the fluidized bed can be kept at an allowable temperature by avoiding the disadvantages that the cooling pipes laid in the fluidized bed entail, and by keeping heat away in the cooler42 adapt the heat transferred in the steam boiler to the steam output required.

Claims (2)

1. Steam power station with a pressure-fried steam generator (1) employing fluidized-bed firing, all the heating surfaces of the boiler being located outside the fluidized layer of the fluidized bed, with a pressure-charger group (2), comprising a gas turbine (4) and a compressor (5), which delivers the compressed combustion-air to beneath the fluidized bed, in order to form a fluidized layer (17) thereon, with devices for separating-off, filtering, and discharging the pulverulent impurities contained in the flue gas, as well as for controlling and regulating the output of steam to the steam turbogenerator group, characterised in that the devices for controlling and regulating the steam output comprise a bypass-flow flue gas duct, with butterfly-type bypass-flow regulating valves (31, 32, 33), which is located inside the steam generator (1), above the fluidized layer (17), parallel to a main-flow flue gas duct, and a flue gas bypass-flow line (39, 40) which branches from a flue gas offtake line (34), downstream of the steam generator (1), the bypass-flow flue gas duct being separated from the main-flow flue gas duct by means of partitions (28, 29, 30), while the above-mentioned flue gas bypass-flow line (39, 40) contains a butterfly-type flue gas bypass-flow valve (41), a flue gas cooler (42), and a fan (43), and opens into the steam generator (1) beneath the fluidized bed.
2. Steam power station according to claim 1, characterised in that a secondary flue gas bypass-flow line (46) is provided, which is connected to the flue gas bypass-flow line (39,40), upstream of the butterfly-type flue gas bypass-flow valve (41 ) and downstream of the flue gas cooler (42), and which contains a secondary butterfly-type flue gas bypass-flow valve (47), in that arrangements are made to tap off flue gas, from the flue gas bypass-flow line (39, 40), downstream of the fan (43), into an injector (37), in order to blow solid, unburnt constituents, precipitated from the flue gas offtake line (34), into the fluidized bed, and in that a flue gas/air mixer (44) is provided in the flue gas bypass-flow line (39,40), upstream of the point at which the latter is introduced below the fluidized bed of the steam generator (1), a branch line from the main air line (3) being connected to this flue gas/air mixer (44).
EP80200338A 1980-04-16 1980-04-16 Steam power station with pressure-fired fluidised bed steam generator Expired EP0037858B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8080200338T DE3066241D1 (en) 1980-04-16 1980-04-16 Steam power station with pressure-fired fluidised bed steam generator
EP80200338A EP0037858B1 (en) 1980-04-16 1980-04-16 Steam power station with pressure-fired fluidised bed steam generator
US06/245,075 US4380147A (en) 1980-04-16 1981-03-18 Steam power plant containing pressure-fired steam generator with fluidized bed firing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80200338A EP0037858B1 (en) 1980-04-16 1980-04-16 Steam power station with pressure-fired fluidised bed steam generator

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EP0037858A1 EP0037858A1 (en) 1981-10-21
EP0037858B1 true EP0037858B1 (en) 1984-01-25

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DE3066241D1 (en) 1984-03-01
EP0037858A1 (en) 1981-10-21

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