EP0205761B1 - Device for varying the bed height in a fluidized-bed combustion chamber - Google Patents

Device for varying the bed height in a fluidized-bed combustion chamber Download PDF

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Publication number
EP0205761B1
EP0205761B1 EP86103253A EP86103253A EP0205761B1 EP 0205761 B1 EP0205761 B1 EP 0205761B1 EP 86103253 A EP86103253 A EP 86103253A EP 86103253 A EP86103253 A EP 86103253A EP 0205761 B1 EP0205761 B1 EP 0205761B1
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EP
European Patent Office
Prior art keywords
combustion chamber
bed combustion
pressure
fluidised bed
fluidized bed
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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.)
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EP86103253A
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German (de)
French (fr)
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EP0205761A2 (en
EP0205761A3 (en
Inventor
Hans-Joachim Meier
Rafael Aruth
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Deutsche Babcock Werke Energie und Umwelttechnik AG
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Deutsche Babcock Werke AG
Deutsche Babcock Werke Energie und Umwelttechnik AG
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Priority to AT86103253T priority Critical patent/ATE56519T1/en
Publication of EP0205761A2 publication Critical patent/EP0205761A2/en
Publication of EP0205761A3 publication Critical patent/EP0205761A3/en
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Publication of EP0205761B1 publication Critical patent/EP0205761B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
    • F23C10/30—Control devices specially adapted for fluidised bed, combustion apparatus for controlling the level of the bed or the amount of material in the bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel

Definitions

  • the invention relates to a device for changing the bed height in a fluidized bed combustion chamber with the features of the preamble of claim 1.
  • DE-A-3 004 848 describes a fluidized bed combustion chamber which is arranged within a pressure vessel and is connected to a storage vessel via a delivery line.
  • This feed line serves both to transfer bed material into the storage container and to return the bed material to the fluidized bed combustion chamber.
  • the storage container is provided with a gas connection which is connected to a single line connected to the air supply system of the fluidized bed combustion chamber.
  • a valve is arranged in this line, via which the pressure can be regulated in a manner not described in detail so that the fluidized fluidized bed mass can be conveyed back and forth.
  • the device according to the invention which is provided with a single delivery line in a manner known per se, is considerably simplified by integrating the hot gas filter into the collecting container below the single gas connection to be set under changing pressure.
  • the hot gas filter is flowed through in the opposite direction and thus cleaned.
  • the gas can thus be largely cleaned in a simple manner.
  • a fluidized bed combustion chamber 2 is arranged within a pressure vessel 1 under increased pressure.
  • the fluidized bed combustion chamber 2 has a nozzle base 3, above which a fluidized bed 4 is located.
  • flow-through tubes for generating steam are laid. These tubes are not essential to the invention and are therefore not shown for reasons of clarity.
  • the compressor 7 feeds air into the pressure vessel 1 under increased pressure.
  • the air penetrates through the nozzle base 3 into the fluidized bed 4 and burns the fuel present there.
  • the hot flue gas generated is cleaned in separators, not shown, and fed to a gas turbine 8, in which it is expanded.
  • the gas turbine 8 drives the compressor 7 and a generator 9.
  • Each collecting container 10 is connected to the fluidized bed combustion chamber 2 via a delivery line 11, the delivery line 11 opening into the lower part of the fluidized bed 4.
  • the conveyor line 11 has a sloping section, the inclination of which is 10 ° to 30 ° with respect to the horizontal. This inclined section prevents undesired overflow of the bed material between the collecting containers 10 and the fluidized bed combustion chamber 2.
  • Hot gas filters 12 are provided in the upper part of the collecting container 10.
  • the hot gas filters 12 are made of a ceramic material and consist of tubes open on one side or of a ceramic woven or non-woven material which can be used at temperatures up to about 1000 ° C.
  • the collecting container 10 is provided with a gas connection 13, via which the collecting container 10 is to be placed under changing pressure.
  • the gas connection 13 and the delivery line 11 of each collecting container 10 are connected to a pressure line 14, 15 which is branched off from the air line 6 leading from the compressor 7 to the pressure container 1.
  • a pressure-increasing fan 16, 17 and a throttle and shut-off device 18, 19 are arranged in the pressure lines 14, 15.
  • each collecting container 10 is further connected to an expansion line 26, 27, in which throttling and shut-off elements 28, 29 are arranged.
  • the expansion line 26, 27 is led to the gas turbine 8 and connected to such a point in the gas turbine system, the pressure of which corresponds to the pressure in the expansion line 26, 27. All throttling and shut-off devices 18, 19, 22, 23, 28, 29 are outside the pressure container 1.
  • bed material is drawn off from the fluidized bed 4 and stored in the collecting containers 10.
  • the bed material stored in the collecting containers 10 is then returned to the fluidized bed combustion chamber 2 in order to increase the bed height.
  • the bed material is discharged by applying a lower gas-side pressure in the collecting containers 10 through the gas connection 13 and the expansion lines 26, 27 than in the fluidized bed combustion chamber 2. In this way, the bed material is conveyed into the collecting container 10 by means of pneumatic negative pressure conveyance.
  • the bed material can be kept hot for a long time by the insulation of the collecting container 10 or by the medium flowing through the walls of the collecting container 10, so that it can be returned to the fluidized bed combustion chamber 2 when required.
  • the gases inevitably discharged from the fluidized bed 4 during the pneumatic transport of the bed material are cleaned in the hot gas filters 12 integrated in the collecting container 10. The cleaned gas can be at a suitable. Be fed into the gas turbine system.
  • the pressure is increased by blowing air into the collection container 10 to such an extent that it lies above the pressure in the fluidized bed combustion chamber 2. Due to the increased pressure in this way, the bed material is conveyed from the collecting containers 10 into the fluidized bed combustion chamber 2 via the delivery lines 11. The transport of the bed material is supported by a conveying air flow, which is blown directly into the conveying lines 11 through the pressure lines 14, 15. During the emptying of the collecting container 10, the hot gas filters 12 are flowed through by the air in the opposite direction and at the same time cleaned in a simple manner.
  • the fluidized bed combustion chamber 2 is provided with partially converging side walls according to FIGS. 2 and 3. In the region of the converging side walls, the collecting containers 10 are attached directly to the fluidized bed combustion chamber 2.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Abstract

A device for varying the height of a bed in a fluidized combustion chamber inside a pressurized housing. Bed material is supplied to the chamber from hoppers or returned back to the hoppers from the chamber through a supply line. The supply line connects the chamber and the hoppers. The hoppers have means of increasing or decreasing the pressure. To improve the means of both increasing and decreasing pressure in the known device and of cleaning the gas that enters into contact with the material in the hopper, each hopper contains a hot-gas filter that gas can flow through in two directions and each hopper communicates above the filter with a gas connection that can be maintained at either a higher or a lower pressure than the fluidized combustion chamber.

Description

Die Erfindung betrifft eine Vorrichtung zur Veränderung der Schichthöhe in einer Wirbelschichtbrennkammer mit den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a device for changing the bed height in a fluidized bed combustion chamber with the features of the preamble of claim 1.

Bei einer bekannten Vorrichtung (EP-A-0 124 842) ist die Wirbelschichtbrennkammer mit dem Vorratsbehälter über zwei Leitungen verbunden. Die Ausschubleitung steht mit dem Vorratsbehälter über einen Zyklonabscheider in Verbindung und ist unter erniedrigten Druck zu setzen. In die davon getrennte Rückführleitung mündet eine Leitung ein, in der ein erhöhter Druck einzustellen ist. Beide druckführenden Leitungen sind mit Ventilen ausgerüstet. Die bekannte Vorrichtung zur Einstellung der Schichthöhe erfordert daher einen hohen apparativen Aufwand.In a known device (EP-A-0 124 842), the fluidized bed combustion chamber is connected to the storage container via two lines. The discharge line is connected to the storage container via a cyclone separator and is to be put under reduced pressure. A line opens into the separate return line, in which an increased pressure is to be set. Both pressure lines are equipped with valves. The known device for adjusting the layer height therefore requires a lot of equipment.

In der DE-A-3 004 848 ist eine Wirbelschichtbrennkammer beschrieben, die innerhalb eines Druckbehälters angeordnet und über eine Förderleitung mit einem Speicherbehälter verbunden ist. Diese Förderleitung dient sowohl dem Überführen von Bettmaterial in den Speicherbehälter als auch dem Rückführen des Bettmaterials in die Wirbelschichtbrennkammer. Der Speicherbehälter ist mit einem Gasanschluß versehen, der mit einer einzigen an das Luftversorgungssystem der Wirbelschichtbrennkammer angeschlossenen Leitung verbunden ist. In dieser Leitung ist ein Ventil angeordnet, über das in nicht näher beschriebener Weise der Druck so regelbar ist, daß die fluidisierte Wirbelschichtmasse hin- und hergefördert werden kann.DE-A-3 004 848 describes a fluidized bed combustion chamber which is arranged within a pressure vessel and is connected to a storage vessel via a delivery line. This feed line serves both to transfer bed material into the storage container and to return the bed material to the fluidized bed combustion chamber. The storage container is provided with a gas connection which is connected to a single line connected to the air supply system of the fluidized bed combustion chamber. A valve is arranged in this line, via which the pressure can be regulated in a manner not described in detail so that the fluidized fluidized bed mass can be conveyed back and forth.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Vorrichtung hinsichtlich des Druckaufbaus und der Druckabsenkung sowie der Möglichkeit der Reinigung des mit dem Material in den Sammelbehälter gelangenden Gases zu verbessern.The invention has for its object to improve the known device with regard to the pressure build-up and the pressure reduction and the possibility of cleaning the gas entering the collection container with the material.

Diese Aufgabe wird bei einer gattungsgemäßen Vorrichtung durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen der -Erfindung sind in den Unteransprüchen angegeben.This object is achieved in a generic device by the characterizing features of claim 1. Advantageous refinements of the invention are specified in the subclaims.

Die in an sich bekannter Weise mit einer einzigen Förderleitung versehene, erfindungsgemäße Vorrichtung ist durch die Integration des Heißgasfilters in den Sammelbehälter unterhalb des einzigen und unter wechselnden Druck zu setzenden Gasanschlusses wesentlich vereinfacht. Bei der Unterdrucksetzung des Sammelbehälters wird das Heißgasfilter in Gegenrichtung durchströmt und damit abgereinigt. In Verbindung mit dem keramischen Werkstoff, aus dem die Heißgasfilter gefertigt sind, kann damit das Gas in einfacher Weise weitgehend gereinigt werden.The device according to the invention, which is provided with a single delivery line in a manner known per se, is considerably simplified by integrating the hot gas filter into the collecting container below the single gas connection to be set under changing pressure. When the collecting container is pressurized, the hot gas filter is flowed through in the opposite direction and thus cleaned. In conjunction with the ceramic material from which the hot gas filters are made, the gas can thus be largely cleaned in a simple manner.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 schematisch eine. Wirbelschichtbrennkammer mit einer Vorrichtung gemäß der Erfindung,
  • Fig. 2 perspektivisch eine Wirbelschichtbrennkammer mit einer anderen Vorrichtung gemäß der Erfindung und
  • Fig. 3 die Ansicht X gemäß Fig. 2.
Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • Fig. 1 schematically one. Fluidized bed combustion chamber with a device according to the invention,
  • Fig. 2 in perspective a fluidized bed combustion chamber with another device according to the invention and
  • 3 shows the view X according to FIG. 2.

Innerhalb eines unter erhöhtem Druck stehenden Druckbehälters 1 ist eine Wirbelschichtbrennkammer 2 angeordnet. Die Wirbelschichtbrennkammer 2 weist einen Düsenboden 3 auf, oberhalb dessen sich eine Wirbelschicht 4 befindet. Oberhalb der Wirbelshicht 4 besteht ein Freiraum 5. Innerhalb der Wirbelschicht 4 und des Freiraums 5 sind durchströmte Rohre zur Erzeugung von Dampf verlegt. Diese Rohre sind für die Erfindung unwesentlich und daher aus Gründen der Übersichtlichkeit nicht dargestellt.A fluidized bed combustion chamber 2 is arranged within a pressure vessel 1 under increased pressure. The fluidized bed combustion chamber 2 has a nozzle base 3, above which a fluidized bed 4 is located. There is a free space 5 above the fluidized bed 4. Inside the fluidized bed 4 and the free space 5, flow-through tubes for generating steam are laid. These tubes are not essential to the invention and are therefore not shown for reasons of clarity.

In den Druckbehälter 1 mündet eine Luftleitung 6, an die ein Kompressor 7 angeschlossen ist. Der Kompressor 7 speist Luft unter erhöhtem Druck in den Druckbehälter 1 ein. Die Luft dringt durch den Düsenboden 3 in die Wirbelschicht 4 ein und verbrennt den dort vorhandenen Brennstoff. Das erzeugte heiße Rauchgas wird in nicht dargestellten Abscheidern gereinigt und einer Gasturbine 8 zugeführt, in der es entspannt wird. Die Gasturbine 8 treibt den Kompressor 7 und einen Generator 9 an.An air line 6, to which a compressor 7 is connected, opens into the pressure vessel 1. The compressor 7 feeds air into the pressure vessel 1 under increased pressure. The air penetrates through the nozzle base 3 into the fluidized bed 4 and burns the fuel present there. The hot flue gas generated is cleaned in separators, not shown, and fed to a gas turbine 8, in which it is expanded. The gas turbine 8 drives the compressor 7 and a generator 9.

Zur Regelung der Schichthöhe des Bettmaterials in der Wirbelschicht 4 sind ein oder mehrere Sammelbehälter 10 vorgesehen, die innerhalb des Druckbehälters 1 angeordnet und zweckmäßigerweise mit einer Isolierung versehen sind. Die Wände der Sammelbehälter 10 können auch von Rohren umgeben oder durch Rohre gebildet sein, die von Speisewasser oder Dampf durchströmt sind.To control the layer height of the bed material in the fluidized bed 4, one or more collecting containers 10 are provided, which are arranged within the pressure container 1 and are expediently provided with insulation. The walls of the collecting container 10 can also be surrounded by pipes or can be formed by pipes through which feed water or steam flows.

Jeder Sammelbehälter 10 ist über eine Förderleitung 11 mit der Wirbelschichtbrennkammer 2 verbunden, wobei die Förderleitung 11 in den unteren Teil der Wirbelschicht 4 einmündet. Die- Förderleitung 11 weist einen schräg ansteigenden Abschnitt auf, dessen Neigung gegenüber der Horizontalen 10° bis 30° beträgt. Dieser geneigte Abschnitt verhindert ein ungewolltes Überlaufen des Bettmaterials zwischen den Sammelbehältern 10 und der Wirbelschichtbrennkammer 2.Each collecting container 10 is connected to the fluidized bed combustion chamber 2 via a delivery line 11, the delivery line 11 opening into the lower part of the fluidized bed 4. The conveyor line 11 has a sloping section, the inclination of which is 10 ° to 30 ° with respect to the horizontal. This inclined section prevents undesired overflow of the bed material between the collecting containers 10 and the fluidized bed combustion chamber 2.

In dem oberen Teil des Sammelbehälters 10 sind Heißgasfilter 12 vorgesehen. Die Heißgasfilter 12 sind aus einem keramischen Werkstoff gefertigt und bestehen aus einseitig offenen Röhrchen oder aus einem keramischen Gewebe- oder Fliesmaterial, welches bei Temperaturen bis zu etwa 1000°C eingesetzt werden kann. Oberhalb der Heißgasfilter 12 ist der Sammelbehälter 10 mit einem Gasanschluß 13 versehen, über den der Sammelbehälter 10 unter wechselnden Druck zu setzen ist. Der Gasanschluß 13 und die Förderleitung 11 jedes Sammelbehälters 10 sind mit einer Druckleitung 14, 15 verbunden, die von der von dem Kompressor 7 zum Druckbehälter 1 führenden Luftleitung 6 abgezweigt ist. In den Druckleitungen 14, 15 sind ein Druckerhöhungsgebläse 16, 17 und ein Drossel- und Absperrorgan 18, 19 angeordnet.Hot gas filters 12 are provided in the upper part of the collecting container 10. The hot gas filters 12 are made of a ceramic material and consist of tubes open on one side or of a ceramic woven or non-woven material which can be used at temperatures up to about 1000 ° C. Above the hot gas filter 12, the collecting container 10 is provided with a gas connection 13, via which the collecting container 10 is to be placed under changing pressure. The gas connection 13 and the delivery line 11 of each collecting container 10 are connected to a pressure line 14, 15 which is branched off from the air line 6 leading from the compressor 7 to the pressure container 1. A pressure-increasing fan 16, 17 and a throttle and shut-off device 18, 19 are arranged in the pressure lines 14, 15.

Von der Luftleitung 6 kann eine zweite Druckleitung 20 abzweigen, in der wiederum ein Druckerhöhungsgebläse 21 und Drossel- und Absperrorgane 22, 23 angeordnet sind. Diese zweite Druckleitung 20 ist mit Rohrschlangen 24, 25 verbunden, die in dem Freiraum 5 der Wirbelschichtbrennkammer 2 verlegt sind. In den Rohrschlangen 24, 25 wird die Luft vor dem Eintritt in die Sammelbehälter 10 und dem Durchtritt durch die Heißgasfilter 12 auf eine Temperatur erhitzt, die der Temperatur in den Sammelbehältern 10 etwa entspricht. Auf diese Weise kann ein möglicher Temperaturschock der keramischen Heißgasfilter 12 vermieden werden.A second pressure line 20 can branch off from the air line 6, in which a pressure-increasing blower 21 and throttling and shut-off elements 22, 23 are arranged. This second pressure line 20 is connected to coils 24, 25 which in the free space 5 of the fluidized bed combustion chamber 2 are moved. In the coils 24, 25, the air is heated to a temperature which corresponds approximately to the temperature in the collecting containers 10 before entering the collecting containers 10 and passing through the hot gas filters 12. In this way, a possible temperature shock of the ceramic hot gas filter 12 can be avoided.

Der Gasanschluß 13 eines jeden Sammelbehälters 10 ist weiterhin mit einer Entspannungsleitung 26, 27 verbunden, in der Drossel- und Absperrorgane 28, 29 angeordnet sind. Die Entspannungsleitung 26, 27 ist zu der Gasturbine 8 geführt und an eine solche Stelle des Gasturbinensystems angeschlossen, dessen Druck dem Druck in der Entspannungsleitung 26, 27 entspricht. Alle Drossel- und Absperrorgane 18, 19, 22, 23, 28, 29 liegen außerhalb des Druckbehälters 1.The gas connection 13 of each collecting container 10 is further connected to an expansion line 26, 27, in which throttling and shut-off elements 28, 29 are arranged. The expansion line 26, 27 is led to the gas turbine 8 and connected to such a point in the gas turbine system, the pressure of which corresponds to the pressure in the expansion line 26, 27. All throttling and shut-off devices 18, 19, 22, 23, 28, 29 are outside the pressure container 1.

Zur Leistungsregelung der Wirbelschichtbrennkammer 2 wird bei einer Leistungsverminderung Bettmaterial aus der Wirbelschicht 4 abgezogen und in den Sammelbehältern 10 gelagert. Bei einer erneuten Leistungssteigerung wird dann das in den Sammelbehältern 10 bevorratete Bettmaterial zur Anhebung der Schichthöhe wieder in die Wirbelschichtbrennkammer 2 zurückgegeben.To regulate the output of the fluidized bed combustion chamber 2, when the output is reduced, bed material is drawn off from the fluidized bed 4 and stored in the collecting containers 10. When the output increases again, the bed material stored in the collecting containers 10 is then returned to the fluidized bed combustion chamber 2 in order to increase the bed height.

Ausgetragen wird das Bettmaterial dadurch, daß in den Sammelbehältern 10 durch den Gasanschluß 13 und die Entspannungsleitungen 26, 27 ein geringerer gasseitiger Druck aufgebracht wird, als in der Wirbelschichtbrennkammer 2 herrscht. Auf diese Weise wird das Bettmaterial auf dem Wege einer pneumatischen Unterdruckförderung in die Sammelbehälter 10 gefördert. Durch die Isolierung der Sammelbehälter 10 oder durch das die Wände der Sammelbehälter 10 durchströmende Medium kann das Bettmaterial langfristig heiß gehalten werden, so daß es im heißen Zustand bei Bedarf wieder in die Wirbelschichtbrennkammer 2 zurückgeführt werden kann. Die bei dem pneumatischen Transport des Bettmaterials zwangsläufig mit ausgetragenen Gase aus der Wirbelschicht 4 werden in den in die Sammelbehälter 10 integrierten Heißgasfiltern 12 gereinigt. Das gereinigte Gas kann an einer geeigneten . Stelle in das Gasturbinensystem eingespeist werden.The bed material is discharged by applying a lower gas-side pressure in the collecting containers 10 through the gas connection 13 and the expansion lines 26, 27 than in the fluidized bed combustion chamber 2. In this way, the bed material is conveyed into the collecting container 10 by means of pneumatic negative pressure conveyance. The bed material can be kept hot for a long time by the insulation of the collecting container 10 or by the medium flowing through the walls of the collecting container 10, so that it can be returned to the fluidized bed combustion chamber 2 when required. The gases inevitably discharged from the fluidized bed 4 during the pneumatic transport of the bed material are cleaned in the hot gas filters 12 integrated in the collecting container 10. The cleaned gas can be at a suitable. Be fed into the gas turbine system.

Zur Entleerung der Sammelbehälter 10 in die Wirbelschichtbrennkammer 2 wird nach entsprechender Umschaltung der Drossel- und Absperrorgane durch Einblasen von Luft in die Sammelbehälter 10 der Druck soweit erhöht, daß er oberhalb des Druckes in der Wirbelschichtbrennkammer 2 liegt. Auf Grund des so erhöhten Druckes wird das Bettmaterial aus den Sammelbehältern 10 über die Förderleitungen 11 in die Wirbelschichtbrennkammer 2 gefördert. Der Transport des Bettmaterials wird durch einen Förderluftstrom unterstützt, der durch die Druckleitungen 14, 15 direkt in die Förderleitungen 11 eingeblasen wird. Während des Entleerens der Sammelbehälter 10 werden die Heißgasfilter 12 von der Luft in Gegenrichtung durchströmt und dabei gleichzeitig auf einfache Weise abgereinigt.To empty the collection container 10 into the fluidized bed combustion chamber 2, after switching the throttling and shut-off devices accordingly, the pressure is increased by blowing air into the collection container 10 to such an extent that it lies above the pressure in the fluidized bed combustion chamber 2. Due to the increased pressure in this way, the bed material is conveyed from the collecting containers 10 into the fluidized bed combustion chamber 2 via the delivery lines 11. The transport of the bed material is supported by a conveying air flow, which is blown directly into the conveying lines 11 through the pressure lines 14, 15. During the emptying of the collecting container 10, the hot gas filters 12 are flowed through by the air in the opposite direction and at the same time cleaned in a simple manner.

Die Wirbelschichtbrennkammer 2 ist gemäß den Fig. 2 und 3 mit teilweise konvergierenden Seitenwänden versehen. Im Bereich der konvergierend verlaufenden Seitenwänden sind die Sammelbehälter 10 unmittelbar an die Wirbelschichtbrennkammer 2 angesetzt.The fluidized bed combustion chamber 2 is provided with partially converging side walls according to FIGS. 2 and 3. In the region of the converging side walls, the collecting containers 10 are attached directly to the fluidized bed combustion chamber 2.

Die Sammelbehälter 10 sind mit der Wirbelschicht 4 der Wirbelschichtbrennkammer 2 durch einen siphonartigen Schlitz 30 verbunden. Dieser siphonartige Schlitz 30 verhindert ein unbeabsichtigtes Übertreten des Bettmaterials. Der Sammelbehälter 10 weist eine gegenüber dem Druckbehälter 1 abgeschlossene Luftbox 31 und einen Düsenboden auf. Die Luftbox 31 ist mit einem Luftanschluß 32 verbunden, der durch den Druckbehälter herausgeführt ist. Ein weiterer Luftanschluß 33 ist mit einer Verteileinrichtung 34 versehen, die in der Nähe des Schlitzes 30 vorgesehen ist. Im übrigen stimmen die Sammelbehälter 10 gemäß den Fig. 2 und 3 mit denen gemäß der Fig. 1 überein.The collection containers 10 are connected to the fluidized bed 4 of the fluidized bed combustion chamber 2 through a siphon-like slot 30. This siphon-like slot 30 prevents the bed material from being inadvertently passed over. The collecting container 10 has an air box 31 which is sealed off from the pressure container 1 and a nozzle base. The air box 31 is connected to an air connection 32 which is led out through the pressure vessel. Another air connection 33 is provided with a distributor 34, which is provided in the vicinity of the slot 30. Otherwise, the collecting containers 10 according to FIGS. 2 and 3 correspond to those according to FIG. 1.

Bei der Vorrichtung gemäß den Fig. 2 und 3 werden die Beladungs- und Entladungsvorgänge durch ein Fluidisieren der Sammelbehälter 10 angeregt. Das Fluidisieren findet bei einem höheren Druck im Falle der Entleerung und bei einem niedrigeren Druck im Falle des Befüllens statt. Die bei der Befüllung der Sammelbehälter 10 austretenden Fluidisationsgase werden über das in den Sammelbehälter 10 integrierte keramische Heißgasfilter 12 abgezogen und gereinigt. Während des Entleerens kann durch die Gasanschlüsse 13 Luft in die Sammelbehälter 10 gegeben und damit die Heißgasfilter 12 abgereinigt werden. Die über die Verteileinrichtung 34 in den Schlitz 30 eingegebene Fluidisationsluft sorgt für ein einwandfreies fließendes Bettmaterial in diesem Bereich.In the device according to FIGS. 2 and 3, the loading and unloading processes are stimulated by fluidizing the collecting container 10. The fluidization takes place at a higher pressure in the case of emptying and at a lower pressure in the case of filling. The fluidization gases emerging during the filling of the collecting container 10 are drawn off and cleaned via the ceramic hot gas filter 12 integrated in the collecting container 10. During the emptying process, air can be introduced into the collecting containers 10 through the gas connections 13 and the hot gas filters 12 can thus be cleaned. The fluidization air entered into the slot 30 via the distribution device 34 ensures a perfect flowing bed material in this area.

Claims (7)

1. Device for varying the height of the layer in a fluidised bed combustion chamber (2), which is arranged within a pressure vessel (1) standing under increased pressure, by the transfer or return of bed material out of the fluidised bed combustion chamber (2) into or out of collecting containers (10), which are each connected by way of a respective conveying duct (11), which serves for the transfer and the return of the bed material, with the fluidised bed combustion chamber (2) and each provided in the upper part with a respective gas connection (13) for a lowering of the pressure or an increasing of the pressure, characterised thereby, that each collecting container (10) is provided underneath the gas connection (13) with an internally disposed hot gas filter (12), which can be flowed through in two opposite directions and that the gas connection (13) is to be set under a higher pressure than the fluidised bed combustion chamber (2) by way of a closable duct (14, 15, 20) and set under a lower pressure than the fluidised bed combustion chamber (2) by a further closable duct (26, 27).
2. Device according to claim 1, characterised thereby, that a preheater, which is arranged in the free space (5) of the fluidised bed combustion chamber (2) and in which the medium flowing through is heated to a temperature which corresponds to the temperature in the collecting container (10), is arranged at the gas connection (13).
3. Device according to claim 1 or 2, characterised thereby, that the conveying duct (11) displays an upwardly inclined portion, the inclination of which amounts to about 10° to 30° to the horizontal, before the entry into the fluidised bed combustion chamber (2).
4. Device according to one of the claims 1 to 3, characterised thereby, that the hot gas filter (12) consists of a ceramic material.
5. Device according to one of the claims 1 to 4, characterised thereby, that in the case of the use of a fluidised bed combustion chamber (2) with partially converging side walls, the collecting containers (10) are placed directly against the converging part of the fluidised bed combustion chamber (2) and connected with this by way of a siphon-like slot (30) and that the collecting containers (10) are provided with an air box (30) provided with nozzle base.
6. Device according to claim 5, characterised thereby, that a distributing equipment (34), which is acted on by air, is provided in the region of the slot (30).
7. Device according to one or more of the claims 1 to 6, characterised thereby, that the walls of the collecting containers (10) are flowed through by feedwater or steam.
EP86103253A 1985-06-22 1986-03-11 Device for varying the bed height in a fluidized-bed combustion chamber Expired - Lifetime EP0205761B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103253T ATE56519T1 (en) 1985-06-22 1986-03-11 DEVICE FOR CHANGING THE LAYER HEIGHT IN A FLUID BED COMBUSTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853522394 DE3522394A1 (en) 1985-06-22 1985-06-22 DEVICE FOR CHANGING THE LAYER HEIGHT IN A FLUIDIZED LIFE COMBUSTION CHAMBER
DE3522394 1985-06-22

Publications (3)

Publication Number Publication Date
EP0205761A2 EP0205761A2 (en) 1986-12-30
EP0205761A3 EP0205761A3 (en) 1988-02-24
EP0205761B1 true EP0205761B1 (en) 1990-09-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103253A Expired - Lifetime EP0205761B1 (en) 1985-06-22 1986-03-11 Device for varying the bed height in a fluidized-bed combustion chamber

Country Status (4)

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US (1) US4667610A (en)
EP (1) EP0205761B1 (en)
AT (1) ATE56519T1 (en)
DE (2) DE3522394A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE450164B (en) * 1985-10-22 1987-06-09 Asea Stal Ab SETTING TO ADJUST THE BED HEIGHT IN A POWER PLANT WITH A FLUIDIZED BED AND POWER PLANT WITH A CONTROL FOR THE BED HEIGHT
DE3628675C1 (en) * 1986-08-23 1987-12-10 Babcock Werke Ag Pressurized fluidized bed combustion
SE469043B (en) * 1991-09-05 1993-05-03 Abb Carbon Ab PROCEDURE AND DEVICE FOR HEATING OF BEDMASS IN PFBC PLANTS

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Publication number Priority date Publication date Assignee Title
US3648380A (en) * 1970-05-28 1972-03-14 Aluminum Co Of America Fluidized bed level control
GB1604313A (en) * 1978-05-31 1981-12-09 Appa Thermal Exchanges Ltd Control of bed level in fluidised bed apparatus
US4279205A (en) * 1979-09-24 1981-07-21 Wormser Engineering, Inc. Storage
DE3004848C2 (en) * 1980-02-09 1983-11-10 L. & C. Steinmüller GmbH, 5270 Gummersbach Fluidized bed combustion
DE3004846C2 (en) * 1980-02-09 1982-11-11 L. & C. Steinmüller GmbH, 5270 Gummersbach Process for the rapid, immediate reversible change in the amount of fluidized bed mass in a fluidized bed furnace
US4419965A (en) * 1981-11-16 1983-12-13 Foster Wheeler Energy Corporation Fluidized reinjection of carryover in a fluidized bed combustor
US4488512A (en) * 1982-11-04 1984-12-18 Boyle Bede Alfred Feedstock injection system for fluidized bed combustor
US4530207A (en) * 1983-05-05 1985-07-23 Asea-Stal Ab Power plant with a fluidized bed combustion chamber
SE441622B (en) * 1983-07-15 1985-10-21 Goetaverken Energy Syst Ab DEVICE FOR COMBUSTION OF CARBONIC MATERIAL IN A REACTION CHAMBER WITH SPIRIT LAYER BED
SE457560B (en) * 1984-06-13 1989-01-09 Abb Stal Ab SETTING UP A BURNER CHAMBER WITH A FLUIDIZED BATH AND POWER PLANT BEFORE USING THE SET

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DOE/MC/14129-173 (DE81025923), "Pressurized Fluidized Bed Combustion Part Load Behavior", A.G. Roberts et al., February 1981 *

Also Published As

Publication number Publication date
DE3522394A1 (en) 1987-01-02
EP0205761A2 (en) 1986-12-30
EP0205761A3 (en) 1988-02-24
DE3674075D1 (en) 1990-10-18
ATE56519T1 (en) 1990-09-15
US4667610A (en) 1987-05-26
DE3522394C2 (en) 1987-08-20

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