EP0313758B1 - Process and device for the cooling of fine dust - Google Patents

Process and device for the cooling of fine dust Download PDF

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Publication number
EP0313758B1
EP0313758B1 EP88113849A EP88113849A EP0313758B1 EP 0313758 B1 EP0313758 B1 EP 0313758B1 EP 88113849 A EP88113849 A EP 88113849A EP 88113849 A EP88113849 A EP 88113849A EP 0313758 B1 EP0313758 B1 EP 0313758B1
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EP
European Patent Office
Prior art keywords
lock system
pressure
flue gas
dust
cooled
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EP88113849A
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German (de)
French (fr)
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EP0313758A1 (en
Inventor
Frank Dziobek
Horst Dr. Möllenhoff
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Deutsche Babcock Werke Energie und Umwelttechnik AG
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Deutsche Babcock Werke Energie und Umwelttechnik AG
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Priority to AT88113849T priority Critical patent/ATE68579T1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/06—Systems for accumulating residues from different parts of furnace plant
    • 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 method and a device for cooling flying dust with the features of the preamble of claims 1 and 4.
  • the invention has for its object to design the known airborne dust transport cooler so that erosion damage from dust, corrosion damage from the transport gas and clogging of the transport line by falling below the dew point are avoided.
  • the cooling takes place in two stages, the pressure lock system serving to reduce the pressure being provided between the cooling stages. Pressure reducing and thus erosion sensitive installations in the pipe system of the cooler are not necessary.
  • the hot area there is also no need for erosion-sensitive injectors, since flue gas is used as the transport gas in the first cooling stage.
  • the final temperature of the flying dust at the end of the first cooling stage is limited to a temperature above the dew point of the flue gas.
  • Air is used as the transport gas during the cooling to the final temperature in the second cooling stage, which allows proper disposal, since air cannot drop below the dew point. Since the airborne dust temperature has dropped considerably before entering the second cooling stage, the erosion problem must be controlled within the injector required to supply the conveying air.
  • the drawing shows a flow diagram for cooling and transporting the dust.
  • the combustion chamber 1 of a fluidized bed furnace operated under pressure is connected on the flue gas side to a separator 2, for example a cyclone, in which flyaway dust is separated from the flue gas.
  • the separator 2 which is followed by further separators, has a gas discharge 3 and one Solid discharge 4, to which a cooler 5 is connected.
  • the cooler 5 is a tube cooler designed as a double tube, which consists of an inner tube 6, which serves to hold the dust, which is surrounded by a cooling jacket 7.
  • a cooling jacket 7 is provided with a feed pipe 8 and a discharge pipe 9 for the coolant. Pressurized water or an organic coolant with a higher boiling temperature is used as the coolant.
  • the inlet temperature of the coolant is 140 degrees C.
  • the inner tube 6 of the cooler 5 is connected to a separator 10 in which the dust and flue gas are separated.
  • the separator 10 is provided with a gas discharge 11 and a solid discharge 12.
  • a flow regulator 14 acting on a valve 13 is arranged in the gas discharge 11 for maintaining pressure.
  • the solids discharge 12 of the separator 10 is connected to a pressure lock system, which consists of a storage tank 15 and a lock tank 16.
  • the separator 10 can also be integrated into the storage container 15.
  • the reservoir 15 and the lock container 16 are connected by a solid line 18 to a shut-off valve 17 and by a pressure compensation line 19.
  • a level meter 20 is connected to the reservoir 15.
  • a differential pressure meter 21 is located in a measuring line between the supply container 15 and the lock container 16.
  • the lock container 16 is provided with a pressure line 22 for supplying compressed air for covering and with a vent line 23 for relaxation.
  • a shut-off valve 24 is arranged in each of the pressure line 22 and the vent line 23.
  • the pressure lock system is actuated in such a way that the emptying of the storage container 15 into the lock container 16 is started via the fill level meter 20 when no pressure difference is displayed on the differential pressure meter 21 after covering the lock container 16.
  • the solids discharge from the lock container 16 is connected via a lockable solids line 25 to an injector 26 which is provided with a connection 27 for conveying air.
  • the injector 26 is connected to a second cooler 28.
  • the cooler 28 is a tube cooler designed as a double tube, which consists of an inner tube 29, which conveys the dust, and a cooling jacket 30 surrounding the tube 29. Instead of a tube, a bundle of tubes connected in parallel, which are enclosed by a common cooling jacket, can also be used.
  • the cooling jacket 30 is provided with a feed connector 31 and an outlet connector 32 for the coolant. Low-pressure water with a temperature of around 30 degrees C is used as the coolant.
  • the inner tube 29 of the second cooler 28 opens into a silo 33 which is under atmospheric pressure.
  • the silo 33 is provided with a solids discharge 34 and with an exhaust air line 35 in which an exhaust air filter 36 is arranged.
  • the vent line 23 is also connected to the silo 33.
  • the flue gas containing the fly dust leaves the combustion chamber 1 at full load at a temperature of approximately 850 degrees C. and a pressure of approximately 16 bar.
  • the separator 2 for separating flue dust and flue gas is operated in such a way that the flue dust is conveyed through the cooler 5 serving as a transport route with the aid of the flue gas.
  • the amount of flue gas drawn off with the flying dust is regulated in such a way that a transport speed is set at the inlet of the cooler 5, which is also at the outlet the cooler 5 allows pneumatic transport.
  • the coolant enters the cooler 5 at a temperature of approximately 140 degrees C and exits at a temperature of approximately 160 degrees C.
  • the heat transfer in the inner tube 6 is sufficient to cool the flying dust-flue gas mixture down to a temperature between 160 degrees C and 200 degrees C with the appropriate tube length and diameter. This temperature is above the water and acid dew point of the flue gas used.
  • the pressure loss when flowing through the inner tube 6 of the cooler 5 is low and, depending on the amount of fly dust and line length, is between 0 and 3 bar.
  • the airborne dust is reduced in the pressure lock system consisting of storage container 15 and lock container 16 to a pressure which is required to convey air into the silo 33 with the aid of air.
  • the pressure of the conveying air entering the injector 26 is equal to or greater than this pressure. Relaxing to a pressure above atmospheric pressure reduces the amount of time and energy required.
  • the pressure of the fly dust is reduced to atmospheric pressure and the temperature of the fly dust is reduced to approximately 50 to 80 degrees C. At this temperature, the dust can be disposed of.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chimneys And Flues (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Treating Waste Gases (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
  • Cyclones (AREA)

Abstract

Flue dust precipitated from the compressed gas from a fluidized-bed combustion chamber is conveyed by flue gas to an air-lock system while simultaneously being cooled to above the water and acid dew point of the flue gas. As it enters the air-lock system, the dust is separated from the flue gas and, once it has left the air-lock system, the dust is conveyed by air while simultaneously being cooled to a final temperature at which it can be removed.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Kühlen von Flugstaub mit den Merkmalen des Oberbegriffes der Ansprüche 1 und 4.The invention relates to a method and a device for cooling flying dust with the features of the preamble of claims 1 and 4.

Bei einem bekannten Flugstaubtransportkühler (VGB Kraftwerkstechnik 63 (1983), Seiten 422 bis 427) wird der Flugstaub mit Hilfe von Druckluft zu dem Druckschleussystem gefördert und dabei auf die gewünschte Endtemperatur gekühlt. Da der Flugstaub eine Temperatur von etwa 850 Grad C aufweist, unterliegen die Injektoren, über die die Förderluft zugeführt wird, einem hohen Verschleiß, der zu einem vorzeitigen Ausfall dieser Anlagenteile führt.In a known airborne dust transport cooler (VGB Kraftwerkstechnik 63 (1983), pages 422 to 427), the airborne dust is conveyed to the pressure lock system with the aid of compressed air and thereby cooled to the desired final temperature. Since the airborne dust has a temperature of around 850 degrees C, the injectors via which the conveying air is supplied are subject to high wear, which leads to premature failure of these system parts.

Es ist auch bekannt (EP-PS 0108505) auf ein aus zwei Behältern bestehendes Druckschleussystem zu verzichten und die Rohre des Kühlers so anzuordnen, daß die Strömungsrichtung des Flugstaub Gas-Gemisches wiederholt abrupt geändert wird, wodurch durch Krümmungsverluste aufeinanderfolgende Druckminderungen entstehen. Bei einem solchen Flugstaubtransportkühler müssen die Rohrkrümmungen in besonderer Weise ausgebildet sein, um Erosionsschäden zu vermeiden. Außerdem ist eine Abkühlung des Flugstaubes nur bis auf 150 bis 200 Grad C möglich, da anderenfalls eine Unterschreitung des Taupunktes die Förderung durch Bildung von Ansätzen an der Rohrinnenwand behindern würde. Die erreichte Endtemperatur läßt auch keine einwandfreie Entsorgung des Flugstaubes zu.It is also known (EP-PS 0108505) to dispense with a pressure lock system consisting of two containers and to arrange the pipes of the cooler in such a way that the flow direction of the fly dust gas mixture is repeatedly changed abruptly, which results in successive pressure reductions due to curvature losses. In such an airborne dust transport cooler, the pipe curvatures must be designed in a special way in order to avoid damage by erosion. In addition, it is only possible to cool the flying dust down to 150 to 200 degrees C, as otherwise falling below the dew point would hinder the production by forming deposits on the inner wall of the pipe. The final temperature reached also does not allow the dust to be disposed of properly.

Der Erfindung liegt die Aufgabe zugrunde, den bekannten Flugstaubtransportkühler so auszubilden, daß Erosionsschäden durch den Staub, Korrosionsschäden durch das Transportgas und ein Verstopfen der Transportleitung durch Taupunktunterschreitung vermieden werden.The invention has for its object to design the known airborne dust transport cooler so that erosion damage from dust, corrosion damage from the transport gas and clogging of the transport line by falling below the dew point are avoided.

Diese Aufgabe wird bei einem gattungsgemäßen Verfahren erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Eine Vorrichtung zur Durchführung des Verfahrens ist in dem Anspruch 4 und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved according to the invention in a generic method by the characterizing features of claim 1. A device for carrying out the method is set out in claim 4 and advantageous embodiments of the invention are specified in the subclaims.

Bei der Erfindung erfolgt die Kühlung in zwei Stufen, wobei zwischen den Kühlstufen das dem Druckabbau dienende Druckschleussystem vorgesehen ist. Druckmindernde und damit erosionsempfindliche Einbauten in dem Rohrsystem des Kühlers sind nicht erforderlich. Ebenso kann im heißen Bereich auf erosionsempfindliche Injektoren verzichtet werden, da in der ersten Kühlstufe Rauchgas als Transportgas verwendet wird. Um Korrosion und ein Verstopfen der Rohre durch ausfallende Säure oder Wasser zu vermeiden, wird die Endtemperatur des Flugstaubes am Ende der ersten Kühlstufe auf eine oberhalb des Taupunktes des Rauchgases liegende Temperatur begrenzt. Während der Kühlung auf die eine einwandfreie Entsorgung zulassende Endtemperatur in der zweiten Kühlstufe wird als Transportgas Luft verwendet, da durch Luft keine Taupunktunterschreitung auftreten kann. Da die Flugstaubtemperatur vor dem Eintritt in die zweite Kühlstufe beträchtlich abgesenkt ist, ist das Erosionsproblem innerhalb des für die Zufuhr der Förderluft erforderlichen Injektors zu beherrschen.In the invention, the cooling takes place in two stages, the pressure lock system serving to reduce the pressure being provided between the cooling stages. Pressure reducing and thus erosion sensitive installations in the pipe system of the cooler are not necessary. In the hot area, there is also no need for erosion-sensitive injectors, since flue gas is used as the transport gas in the first cooling stage. In order to avoid corrosion and clogging of the pipes by acid or water falling out, the final temperature of the flying dust at the end of the first cooling stage is limited to a temperature above the dew point of the flue gas. Air is used as the transport gas during the cooling to the final temperature in the second cooling stage, which allows proper disposal, since air cannot drop below the dew point. Since the airborne dust temperature has dropped considerably before entering the second cooling stage, the erosion problem must be controlled within the injector required to supply the conveying air.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Die Zeichnung zeigt ein Fließschema für das Kühlen und Transportieren des Flugstaubes.An embodiment of the invention is shown in the drawing and is explained in more detail below. The drawing shows a flow diagram for cooling and transporting the dust.

Die Brennkammer 1 einer unter Druck betriebenen Wirbelschichtfeuerung ist rauchgasseitig mit einem Abscheider 2, zum Beispiel einem Zyklon, verbunden, in dem Flugstaub aus dem Rauchgas abgetrennt wird. Der Abscheider 2, dem weitere Abscheider nachgeschaltet sind, weist einen Gasaustrag 3 und einen Feststoffaustrag 4 auf, an den ein Kühler 5 angeschlossen ist. Der Kühler 5 ist ein als Doppelrohr ausgebildeter Rohrkühler, der aus einem inneren, der Aufnahme des Flugstaubes dienenden Rohr 6 besteht, das von einem Kühlmantel 7 umgeben ist. Anstelle eines Rohres können auch mehrere parallel geschaltete und zu einem Bündel zusammengefaßte, den Flugstaub aufnehmende Rohre verwendet werden, die von einem gemeinsamen Kühlmantel umschlossen sind. Der Kühlmantel 7 ist mit einem Zuführungsstutzen 8 und einem Abführungsstutzen 9 für das Kühlmittel versehen. Als Kühlmittel wird unter Druck stehendes Wasser oder ein organisches Kühlmittel mit höherer Siedetemperatur verwendet. Die Eintrittstemperatur des Kühlmittels beträgt 140 Grad C.The combustion chamber 1 of a fluidized bed furnace operated under pressure is connected on the flue gas side to a separator 2, for example a cyclone, in which flyaway dust is separated from the flue gas. The separator 2, which is followed by further separators, has a gas discharge 3 and one Solid discharge 4, to which a cooler 5 is connected. The cooler 5 is a tube cooler designed as a double tube, which consists of an inner tube 6, which serves to hold the dust, which is surrounded by a cooling jacket 7. Instead of a tube, it is also possible to use a plurality of tubes connected in parallel and combined into a bundle, which absorb the fly dust and which are enclosed by a common cooling jacket. The cooling jacket 7 is provided with a feed pipe 8 and a discharge pipe 9 for the coolant. Pressurized water or an organic coolant with a higher boiling temperature is used as the coolant. The inlet temperature of the coolant is 140 degrees C.

Das innere Rohr 6 des Kühlers 5 ist mit einem Abscheider 10 verbunden, in dem Flugstaub und Rauchgas getrennt werden. Der Abscheider 10 ist mit einem Gasaustrag 11 und einem Feststoffaustrag 12 versehen. In dem Gasaustrag 11 ist zur Druckhaltung ein auf ein Ventil 13 wirkender Durchflußregler 14 angeordnet. Der Feststoffaustrag 12 des Abscheiders 10 ist an ein Druckschleussystem angeschlossen, das aus einem Vorlagebehälter 15 und einem Schleusbehälter 16 besteht. Der Abscheider 10 kann auch in den Vorlagebehälter 15 integiert sein.The inner tube 6 of the cooler 5 is connected to a separator 10 in which the dust and flue gas are separated. The separator 10 is provided with a gas discharge 11 and a solid discharge 12. A flow regulator 14 acting on a valve 13 is arranged in the gas discharge 11 for maintaining pressure. The solids discharge 12 of the separator 10 is connected to a pressure lock system, which consists of a storage tank 15 and a lock tank 16. The separator 10 can also be integrated into the storage container 15.

Der Vorlagebehälter 15 und der Schleusbehälter 16 sind durch eine Feststoffleitung 18 mit einem Absperrventil 17 und durch eine Druckausgleichsleitung 19 verbunden. An den Vorlagebehälter 15 ist ein Füllstandsmesser 20 angeschlossen. Zwischen dem Vorlagebehälter 15 und dem Schleusbehälter 16 liegt in einer Meßleitung ein Differenzdruckmesser 21.The reservoir 15 and the lock container 16 are connected by a solid line 18 to a shut-off valve 17 and by a pressure compensation line 19. A level meter 20 is connected to the reservoir 15. A differential pressure meter 21 is located in a measuring line between the supply container 15 and the lock container 16.

Der Schleusbehälter 16 ist mit einer Druckleitung 22 zur Zuführung von Druckluft zur Bespannung und mit einer Entlüftungsleitung 23 zur Entspannung versehen. In der Druckleitung 22 und der Entlüftungsleitung 23 ist je ein Absperrventil 24 angeordnet.The lock container 16 is provided with a pressure line 22 for supplying compressed air for covering and with a vent line 23 for relaxation. A shut-off valve 24 is arranged in each of the pressure line 22 and the vent line 23.

Das Druckschleussystem wird in der Weise betätigt, daß über den Füllstandsmesser 20 die Entleerung des Vorlagebehälters 15 in den Schleusbehälter 16 in Gang gesetzt wird, wenn nach der Bespannung des Schleusbehälters 16 an dem Differenzdruckmesser 21 keine Druckdifferenz mehr angezeigt wird.The pressure lock system is actuated in such a way that the emptying of the storage container 15 into the lock container 16 is started via the fill level meter 20 when no pressure difference is displayed on the differential pressure meter 21 after covering the lock container 16.

Der Feststoffaustrag des Schleusbehälters 16 ist über eine absperrbare Feststoffleitung 25 mit einem Injektor 26 verbunden, der mit einem Anschluß 27 für Förderluft versehen ist. Der Injektor 26 steht mit einem zweiten Kühler 28 in Verbindung. Der Kühler 28 ist ein als Doppelrohr ausgebildeter Rohrkühler, der aus einem inneren, den Flugstaub fördernden Rohr 29 und aus einem das Rohr 29 umgebenden Kühlmantel 30 besteht. Anstelle eines Rohres kann auch ein Bündel parallel geschalteter Rohre verwendet werden, die von einem gemeinsamen Kühlmantel umschlossen sind. Der Kühlmantel 30 ist mit einem Zuführungsstutzen 31 und einem Abführungsstutzen 32 für das Kühlmittel versehen ist. Als Kühlmittel wird Niederdruckwasser mit einer Temperatur von etwa 30 Grad C verwendet.The solids discharge from the lock container 16 is connected via a lockable solids line 25 to an injector 26 which is provided with a connection 27 for conveying air. The injector 26 is connected to a second cooler 28. The cooler 28 is a tube cooler designed as a double tube, which consists of an inner tube 29, which conveys the dust, and a cooling jacket 30 surrounding the tube 29. Instead of a tube, a bundle of tubes connected in parallel, which are enclosed by a common cooling jacket, can also be used. The cooling jacket 30 is provided with a feed connector 31 and an outlet connector 32 for the coolant. Low-pressure water with a temperature of around 30 degrees C is used as the coolant.

Das innere Rohr 29 des zweiten Kühlers 28 mündet in einen unter Atmosphärendruck stehenden Silo 33. Der Silo 33 ist mit einem Feststoffaustrag 34 und mit einer Abluftleitung 35 versehen, in der ein Abluftfilter 36 angeordnet ist. An den Silo 33 ist auch die Entlüftungsleitung 23 angeschlossen.The inner tube 29 of the second cooler 28 opens into a silo 33 which is under atmospheric pressure. The silo 33 is provided with a solids discharge 34 and with an exhaust air line 35 in which an exhaust air filter 36 is arranged. The vent line 23 is also connected to the silo 33.

Das Flugstaub enthaltende Rauchgas verläßt die Brennkammer 1 im Vollastfall mit einer Temperatur von etwa 850 Grad C und einem Druck von etwa 16 bar. Der Abscheider 2 zur Trennung von Flugstaub und Rauchgas wird so betrieben, daß der Flugstaub mit Hilfe des Rauchgases durch den als Transportstrecke dienenden Kühler 5 gefördert wird. Die mit dem Flugstaub abgezogene Rauchgasmenge wird so geregelt, daß sich am Eintritt des Kühlers 5 eine Transportgeschwindigkeit einstellt, die auch noch am Austritt des Kühlers 5 einen pneumatischen Transport zuläßt. Das Kühlmittel tritt in den Kühler 5 mit einer Temperatur von etwa 140 Grad C ein und mit einer Temperatur von etwa 160 Grad C aus. Der Wärmeübergang im inneren Rohr 6 reicht aus, um das Flugstaub-Rauchgas-Gemisch bei entsprechender Rohrlänge und -durchmesser auf etwa eine Temperatur zwischen 160 Grad C und 200 Grad C herunterzukühlen. Diese Temperatur liegt oberhalb des Wasser- und Säuretaupunktes des verwendeten Rauchgases. Der Druckverlust beim Durchströmen des inneren Rohres 6 des Kühlers 5 ist gering und beträgt je nach Flugstaubmenge und Leitungslänge zwischen 0 und 3 bar. Der Flugstaub wird in dem aus Vorlagebehälter 15 und Schleusbehälter 16 bestehenden Druckschleussystem auf einen Druck gesenkt, der erforderlich ist, um mit Hilfe von Luft in den Silo 33 zu fördern. Der Druck der in den Injektor 26 eintretenden Förderluft ist gleich diesem Druck oder größer. Die Entspannung auf einen oberhalb des Atmosphärendruckes liegenden Druck verringert den Zeitaufwand und den Energiebedarf. Nach dem Durchströmen des zweiten Kühlers 28 ist der Druck des Flugstaubes auf Atmosphärendruck und die Temperatur des Flugstaubes auf etwa 50 bis 80 Grad C abgesenkt. Bei dieser Temperatur kann der Flugstaub entsorgt werden.The flue gas containing the fly dust leaves the combustion chamber 1 at full load at a temperature of approximately 850 degrees C. and a pressure of approximately 16 bar. The separator 2 for separating flue dust and flue gas is operated in such a way that the flue dust is conveyed through the cooler 5 serving as a transport route with the aid of the flue gas. The amount of flue gas drawn off with the flying dust is regulated in such a way that a transport speed is set at the inlet of the cooler 5, which is also at the outlet the cooler 5 allows pneumatic transport. The coolant enters the cooler 5 at a temperature of approximately 140 degrees C and exits at a temperature of approximately 160 degrees C. The heat transfer in the inner tube 6 is sufficient to cool the flying dust-flue gas mixture down to a temperature between 160 degrees C and 200 degrees C with the appropriate tube length and diameter. This temperature is above the water and acid dew point of the flue gas used. The pressure loss when flowing through the inner tube 6 of the cooler 5 is low and, depending on the amount of fly dust and line length, is between 0 and 3 bar. The airborne dust is reduced in the pressure lock system consisting of storage container 15 and lock container 16 to a pressure which is required to convey air into the silo 33 with the aid of air. The pressure of the conveying air entering the injector 26 is equal to or greater than this pressure. Relaxing to a pressure above atmospheric pressure reduces the amount of time and energy required. After flowing through the second cooler 28, the pressure of the fly dust is reduced to atmospheric pressure and the temperature of the fly dust is reduced to approximately 50 to 80 degrees C. At this temperature, the dust can be disposed of.

Claims (4)

1. Method for the cooling of flue dust which is separated from a flue gas, which stands under pressure, of a fluidised bed furnace and is conveyed pneumatically through one or more tubes, which are cooled from the outside, to a pressure lock system and wherein the flue dust is conveyed with the aid of air after the exit from the pressure lock system, characterised thereby, that the flue dust is conveyed through the or each cooled tube with the aid of a partial quantity of the flue gas withdrawn together with the flue dust, wherein the flue dust is cooled to a temperature lying above the dew point of the water or acid of the flue gas, that the flue dust is separated from the flue gas before the entry into the pressure lock system and that the flue gas after the exit from the pressure lock system is cooled to the final temperature by means of a second cooler.
2. Method according to claim 1, characterised thereby, that the flue dust is relieved in the pressure lock system to a pressure lying above the atmospheric pressure.
3. Method according to claim 1 or 2, characterised thereby, that coolant, the temperature of which lies above the dew point of the water or acid of the flue gas used, is used in the first cooling stage.
4. Device for the cooling and transporting of flue dust which is separated in one or more separators (2) from a flue gas, which stands under pressure, of a fluidised bed furnace, wherein the or each separator (2) is connected by one of more tubes (6), which are cooled from the outside, with a pressure lock system and an injector (26) provided with a compressed air connection (27) is connected to the output (25) of the pressure lock system, characterised thereby, that a further separator (10) is arranged downstream of the tubes (6), which are cooled from the outside, at the entry of the pressure lock system and that a second cooler consisting of one or more tubes (26), which are cooled from the outside, is connected to the output (25) of the pressure lock system.
EP88113849A 1987-10-28 1988-08-25 Process and device for the cooling of fine dust Expired - Lifetime EP0313758B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113849T ATE68579T1 (en) 1987-10-28 1988-08-25 METHOD AND APPARATUS FOR COOLING FLY DUST.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736521 1987-10-28
DE3736521A DE3736521C1 (en) 1987-10-28 1987-10-28 Method and device for cooling fly dust

Publications (2)

Publication Number Publication Date
EP0313758A1 EP0313758A1 (en) 1989-05-03
EP0313758B1 true EP0313758B1 (en) 1991-10-16

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US (1) US4877423A (en)
EP (1) EP0313758B1 (en)
JP (1) JP2627938B2 (en)
AT (1) ATE68579T1 (en)
CA (1) CA1305310C (en)
DE (2) DE3736521C1 (en)
DK (1) DK165020C (en)
ES (1) ES2026614T3 (en)
GR (1) GR3003014T3 (en)

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CA1305310C (en) 1992-07-21
DE3736521C1 (en) 1989-02-16
DK165020C (en) 1993-02-08
DK596088D0 (en) 1988-10-27
DK596088A (en) 1989-04-29
DE3865626D1 (en) 1991-11-21
JPH01142314A (en) 1989-06-05
ES2026614T3 (en) 1992-05-01
GR3003014T3 (en) 1993-02-17
ATE68579T1 (en) 1991-11-15
EP0313758A1 (en) 1989-05-03
JP2627938B2 (en) 1997-07-09
US4877423A (en) 1989-10-31
DK165020B (en) 1992-09-28

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