EP0341347A1 - Apparatus for the indirect heating of a fluidised bed - Google Patents

Apparatus for the indirect heating of a fluidised bed Download PDF

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Publication number
EP0341347A1
EP0341347A1 EP88121819A EP88121819A EP0341347A1 EP 0341347 A1 EP0341347 A1 EP 0341347A1 EP 88121819 A EP88121819 A EP 88121819A EP 88121819 A EP88121819 A EP 88121819A EP 0341347 A1 EP0341347 A1 EP 0341347A1
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EP
European Patent Office
Prior art keywords
steam
tubes
tube bundle
straight tube
fluidized bed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88121819A
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German (de)
French (fr)
Inventor
Bodo Dr.-Ing. Wolf
Hubert Storch
Siegmund Walczak
Dietmar Dipl.-Ing. Rüger
Walter Bellay
Georg Dipl.-Ing. Dr. Beckmann
Jürgen DDr.-Ing. Geyer
Burkhard Dr.-Ing. Möller
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Waagner Biro AG
Orgreb-Institut fur Kraftwerke
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Waagner Biro AG
Orgreb-Institut fur Kraftwerke
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Publication of EP0341347A1 publication Critical patent/EP0341347A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D13/00—Heat-exchange apparatus using a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/084—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange

Definitions

  • the invention relates to a device for the indirect heating of a fluidized bed dryer by a heat exchanger through which a fluid flows, the fluidized bed being arranged in a housing which widens upward from the inflow floor at least on two opposite sides.
  • a preferred field of application of the invention is in the drying of raw lignite, where high throughput rates are required.
  • Fluidized bed drying plants are known in which water vapor is used as a fluidizing medium and as a heating medium for the heat exchangers provided in the region of the fluidized bed. It is also known that the vortex evaporation of the system after partial cleaning and / or compression and heating is again wholly or partially circulated as a vortex medium or as heating steam.
  • the vortex waste steam is reused as a heating medium, contamination and air pockets occur in the heat exchangers.
  • pipe coil heat exchangers DD-PS 223.511
  • the invention has for its object to design a steam vortex drying system indirectly heated with the tube bundle heat exchanger so that approximately the same flow velocities are achieved over the entire cross-sectional area and height of the fluidized bed during the drying process and that no significant pressure and heat losses of the heating steam occur in the tube bundle heat exchanger.
  • the invention is characterized in that the housing is formed by at least one trough, in each of which a heat exchanger through which condensing steam flows is arranged in the form of a straight tube bundle in several steam passages with a significantly reduced number of tubes or steam cross-section. Further essential features are specified in the subclaims.
  • FIGS. 1 and 2 show sections through the housing 1 of a fluidized bed dryer in which, for example, raw fine coal with a grain size of 0 to 6 mm is dried in a fluidized bed heated indirectly with steam.
  • the material to be dried is entered into the fluidized bed by an entry 12.
  • the dried material leaves the housing 1 of the drying system via the discharge 13.
  • the fluidizing medium is blown through the perforated inflow tubes 14, which lie below the tubes of the straight tube bundle 3, into each trough 2, 2 'of the fluidized bed apparatus.
  • the space between the sloping side surfaces 10 of the tapered troughs 2.2 ' serves as a vortex vapor distribution chamber for the fluidizing medium.
  • the tubes of the straight tube bundle 3 are in the Troughs 2.2 'arranged so that there is a uniform division of the heating register, and open into an external steam condensate collecting space 6, which is designed as a condensate separator 8 and which lies in the fluidized bed.
  • an external steam condensate collecting space 6 which is designed as a condensate separator 8 and which lies in the fluidized bed.
  • To support the individual straight pipes they are guided at appropriate intervals through perforated plates 15, condensate separating devices being provided in particular in the vicinity of the outlet in a collecting chamber.
  • the straight tube bundle is divided into several steam passages according to the criterion of the same entry velocity into the tube bundle or in the same mean flow velocity. This results in steam cross sections with two steam passages, which behave roughly like 90:10. However, if the straight tube bundle 3 has three steam passages, the number of tubes will behave as 78: 18: 4.
  • the division numbers are 67: 22: 8: 3.
  • the straight tube bundle 3 is rigidly connected on one side, at least on the input side, in the first steam passages 4 to the vertical wall 5 of the trough 2, while on the output side or input side in the next steam passages, the combined collection and distribution chamber 6, 7 is designed as a floating head and expediently has condensate separating devices 8.
  • the last collecting chamber 6 'or have the last tubes of the last steam passage 4,4 ⁇ , 4 ′′′ ventilation outlets 9.
  • a fluidized bed distribution chamber 11 is arranged between the troughs, in particular between their sloping side surfaces 10, so that each surface particle of the fluidized bed receives the same steam supply.
  • the arrangement of several troughs 2.2 'in the fluidized bed takes into account the relatively large evaporation during coal drying and enables a homogeneous fluidized bed with approximately uniform flow velocities that hardly change over the entire fluidized bed. This also leads to a reduction in the vortex vapor volume, so that the drive energy for the circuit fan is reduced accordingly.
  • the last collecting chamber 6 'or the pipes of the last steam passage have ventilation outlets 9, so that the air which separates out cannot act as a brake for the heat transfer by the constant increase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

For the optimum design of a steam fluidised bed drying installation, it is proposed to use, for heating the steam fluidised bed, a straight-tube bank (3) which is rolled or welded in the wall (5) on the inlet side and has a floating head exchanger on the other side. The straight-tube bank (3) has a number of steam runs (4, 4', 4'', 4''') so that the speed distribution of the steam is evened out in the individual tubes of the straight-tube bank. The corresponding condensate is deposited in the collecting and distributing chambers (6, 7) so that the flow resistance, in particular in the last steam runs, is not greater than in the first. There is consequently a considerably different number of tubes in the individual steam runs. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur indirekten Behei­zung eines Wirbelbetttrockners durch einen von einem Fluid durchströmten Wärmetauscher, wobei das Wirbelbett in einem zu­mindest an zwei einander gegenüberliegenden Seiten sich vom Anströmboden nach oben erweiternden Gehäuse angeordnet ist. Ein bevorzugtes Anwendungsgebiet der Erfindung liegt bei der Trock­nung von Rohbraunkohle, wo große Durchsetzleistungen erforder­lich sind.The invention relates to a device for the indirect heating of a fluidized bed dryer by a heat exchanger through which a fluid flows, the fluidized bed being arranged in a housing which widens upward from the inflow floor at least on two opposite sides. A preferred field of application of the invention is in the drying of raw lignite, where high throughput rates are required.

Es sind Wirbelschichttrocknungsanlagen bekannt, bei denen Was­serdampf als Wirbelmedium und als Heizmedium für die im Bereich der Wirbelschicht vorgesehenen Wärmeüberträger Verwendung fin­det. Es ist ferner bekannt, daß der Wirbelabdampf der Anlage nach einer Teilreinigung und/oder Verdichtung und Erhitzung wieder als Wirbelmedium bzw. als Heizdampf ganz oder teilweise im Kreislauf gefahren wird. Wir verweisen hiezu auf die DE-OS 23 42 184 bzw. DD-PS 142.086. Bei der Wiederverwendung des Wir­belabdampfes als Heizmedium treten in den Wärmeüberträgern Ver­schmutzungen und zum Teil Lufteinschlüsse auf. Insbesondere sind Rohrschlangenwärmeübertrager (DD-PS 223.511) durch die vorhandenen Krümmungen gegen Verschmutzungen allfällig und die Druckabfälle innerhalb der langen Rohrschlangen erheblich. Aus der DD-PS 51.590 ist es bekannt, bei Wirbelschichttrocknern ein liegendes schwach geneigtes Rohrbündel, welches an den Stirn­seiten fest eingewalzt oder eingeschweißt ist, zu verwenden. Der Heizdampf wird über einen Verteilerkasten zugeführt, kon­densiert im Rohrbündel und wird auf der anderen Seite als Kon­densat über einen Sammelkasten abgeführt. Dies führt während des Betriebes infolge unterschiedlicher Temperierung der be­troffenen Bauteile zu Wärmespannungen, die das Material zusätz­lich belasten und zu Ausfällen führen können. Ferner treten im Rohrbündel Druckverluste durch die zunehmende Kondensation des Dampfes auf, so daß am Ende des Rohrbündels die Dampfgeschwin­digkeit sehr gering wird, wobei durch einzelne Rohre Kondensat getrieben wird, welches unterkühlt wird, wodurch die Wärmeüber­tragung praktisch zum Erliegen kommt. Andererseits tritt durch die Verdampfung der Feuchtigkeit des zu trocknenden Gutes - bei Schlamm verdampft oft bis zu 90 % des Trockengewichtes zu Was­ser - im Trockner eine große Zunahme der Strömungsgeschwindig­keit in Strömungsrichtung des Wirbeldampfes auf. Es wurde daher gemäß DD-PS 234.918 bzw. EP 0200716 das Gehäuse des Wirbel­schichttrockners nach oben konisch erweiternd gestaltet. Dies führt aber in der Mitte des Wirbelbettes zu einer Zunahme der Strömungsgeschwindigkeit, die praktisch nicht abgebaut werden kann, so daß im Bereich der Mitte des Wirbelbettes Dampfblasen entstehen, die sich mit zunehmender Höhe der Wirbelschicht ver­größern, so daß die Geschwindigkeitsverteilung in der Wirbel­schicht, insbesondere in der Mitte, gegenüber den Randzonen erheblich vergrößert. Dies führt zu einem inhomogenen Wirbel­bett, welches erhebliche Leistungsverluste mit sich bringt. Ziel der Erfindung ist es, den erwähnten Störfällen zu begegnen, die Energiebilanz bei derartigen Trocknern zu verbes­sern, so daß die Wirtschaftlichkeit gehoben wird.Fluidized bed drying plants are known in which water vapor is used as a fluidizing medium and as a heating medium for the heat exchangers provided in the region of the fluidized bed. It is also known that the vortex evaporation of the system after partial cleaning and / or compression and heating is again wholly or partially circulated as a vortex medium or as heating steam. We refer to DE-OS 23 42 184 or DD-PS 142.086. When the vortex waste steam is reused as a heating medium, contamination and air pockets occur in the heat exchangers. In particular, pipe coil heat exchangers (DD-PS 223.511) are possible due to the existing curvatures against contamination and Pressure drops significantly within the long coils. From DD-PS 51.590 it is known to use a lying, slightly inclined tube bundle in fluidized bed dryers, which is firmly rolled or welded onto the end faces. The heating steam is supplied via a distribution box, condenses in the tube bundle and is discharged as condensate via a collecting box on the other side. As a result of the different temperatures of the affected components, this leads to thermal stresses during operation which put additional stress on the material and can lead to failures. Furthermore, pressure losses occur in the tube bundle due to the increasing condensation of the steam, so that at the end of the tube bundle the steam speed becomes very low, condensate being driven through individual tubes, which is supercooled, as a result of which the heat transfer comes to a virtual standstill. On the other hand, due to the evaporation of the moisture of the material to be dried - in the case of sludge, up to 90% of the dry weight often evaporates into water - a large increase in the flow velocity in the direction of flow of the vortex steam occurs in the dryer. It was therefore designed according to DD-PS 234.918 or EP 0200716, the housing of the fluidized bed dryer conically widening upwards. However, this leads to an increase in the flow velocity in the middle of the fluidized bed, which can practically not be broken down, so that in the area of the center of the fluidized bed vapor bubbles form which increase with increasing height of the fluidized bed, so that the velocity distribution in the fluidized bed, in particular in the middle, considerably enlarged compared to the peripheral zones. This leads to an inhomogeneous fluidized bed, which entails considerable performance losses. The aim of the invention is to address the aforementioned accidents encounter to improve the energy balance in such dryers, so that the economy is increased.

Der Erfindung liegt die Aufgabe zugrunde, eine mit dem Rohrbün­delwärmeüberträger indirekt beheizte Dampfwirbeltrocknungsanla­ge so zu gestalten, daß über die gesamte Querschnittsfläche und Höhe des Wirbelbettes beim Trocknungsprozeß annähend gleiche Strömungsgeschwindigkeiten erzielt werden und daß im Rohrbün­delwärmeüberträger keine wesentlichen Druck- und Wärmeverluste des Heizdampfes auftreten.The invention has for its object to design a steam vortex drying system indirectly heated with the tube bundle heat exchanger so that approximately the same flow velocities are achieved over the entire cross-sectional area and height of the fluidized bed during the drying process and that no significant pressure and heat losses of the heating steam occur in the tube bundle heat exchanger.

Die Erfindung ist dadurch gekennzeichnet, daß das Gehäuse von mindestens einem Trog gebildet ist, in dem jeweils ein von kon­densierendem Dampf durchströmter Wärmetauscher in Form eines Geradrohrbündels in mehreren Dampfängen mit sich erheblich ver­ringender Rohranzahl bzw. Dampfquerschnitt angeordnet ist. Wei­tere wesentliche Merkmale sind in den Unteransprüchen angege­ben.The invention is characterized in that the housing is formed by at least one trough, in each of which a heat exchanger through which condensing steam flows is arranged in the form of a straight tube bundle in several steam passages with a significantly reduced number of tubes or steam cross-section. Further essential features are specified in the subclaims.

Die Erfindung ist in den angeschlossenen Fig. 1 und 2 bei­spielsweise und schematisch dargestellt. Die Figuren zeigen Schnitte durch das Gehäuse 1 eines Wirbelschichttrockners, in dem beispielsweise Rohfeinkohle mit der Körnung 0 bis 6 mm in einer indirekt mit Dampf beheizten Wirbelschicht getrocknet wird. Das zu trocknende Gut wird durch einen Eintrag 12 in die Wirbelschicht eingetragen. Das getrocknete Gut verläßt das Ge­häuse 1 der Trocknungsanlage über den Austrag 13. Das Wirbelme­dium wird durch die unterhalb der Rohre des Geradrohrbündels 3 quer zu diesen liegenden perforierten Anströmrohre 14 in jeden Trog 2,2′ des Wirbelschichtapparates eingeblasen. Der Zwischen­raum zwischen den schrägen Seitenflächen 10 der nach unten ver­jüngten Tröge 2,2′ dient als Wirbeldampfverteilungskammer für das Wirbelmedium. Die Rohre des Geradrohrbündels 3 sind in den Trögen 2,2′ so angeordnet, daß sich eine gleichmäßige Teilung des Heizregisters ergibt, und münden in einen außen liegenden Dampfkondensatsammelraum 6, der als Kondensatabscheider 8 aus­gebildet ist und der in der Wirbelschicht liegt. Zur Abstützung der einzelnen Geradrohre werden diese an entsprechenden Abstän­den durch Lochbleche 15 geführt, wobei insbesondere in der Nähe des Auslasses in eine Sammelkammer Kondensatabscheideeinrich­tungen vorgesehen sind. Die Aufteilung des Geradrohrbündels in mehrere Dampfgänge erfolgt nach dem Kriterium der gleichen Ein­trittsgeschwindigkeit in das Rohrbündel bzw. in der gleichen mittleren Durchströmgeschwindigkeit. So ergeben sich bei zwei Dampfgängen Dampfquerschnitte, die sich etwa wie 90 : 10 ver­halten. Weist das Geradrohrbündel 3 jedoch drei Dampfgänge auf, so werden sich die Rohranzahlen wie 78 : 18 :4 verhalten. Bei vier Dampfgängen sind die Aufteilungszahlen 67 : 22 : 8 : 3. Zur Vermeidung von Wärmespannungen ist das Geradrohrbündel 3 an einer Seite, zumindest eingangsseitig, in den ersten Dampfgän­gen 4 mit der vertikalen Wand 5 des Troges 2 starr verbunden, während ausgangsseitig bzw. eingangsseitig in den nächsten Dampfgängen die kombinierte Sammel- und Verteilkammer 6,7 als Schwimmkopf ausgebildet ist und zweckmäßigerweise Kondensatab­scheideeinrichtungen 8 aufweist. Darüber hinaus weist die letz­te Sammelkammer 6′ bzw. weisen die letzten Rohre des letzten Dampfganges 4,4˝,4‴ Entlüftungsabgänge 9 auf. Bei der Anord­nung von mehreren Trögen 2,2′ werden zwischen den Trögen, ins­besondere zwischen deren schrägen Seitenflächen 10, eine Wir­belbettverteilungskammer 11 so angeordnet, daß jedes Flächen­teilchen des Wirbelbettes die gleiche Dampfzufuhr erhält. Die Anordnung von mehreren Trögen 2,2′ im Wirbelbett trägt der re­lativ großen Ausdampfung bei der Kohletrocknung Rechnung und ermöglich ein homogenes Wirbelbett mit annähernd gleichmäßigen Strömungsgeschwindigkeiten, die sich über das gesamte Wirbel­bett kaum ändern. Dies führt auch zu einer Reduzierung des Wir­beldampfvolumens, so daß sich auch die Antriebsenergie für das Kreislaufgebläse entsprechend reduziert. Die letzte Sammelkam­mer 6′ bzw. die Rohre des letzten Dampfganges weisen Entlüf­tungsabgänge 9 auf, so daß die sich abscheidende Luft nicht als Bremse für die Wärmeübertragung durch die ständige Vermehrung auswirken kann.The invention is shown, for example and schematically, in the connected FIGS. 1 and 2. The figures show sections through the housing 1 of a fluidized bed dryer in which, for example, raw fine coal with a grain size of 0 to 6 mm is dried in a fluidized bed heated indirectly with steam. The material to be dried is entered into the fluidized bed by an entry 12. The dried material leaves the housing 1 of the drying system via the discharge 13. The fluidizing medium is blown through the perforated inflow tubes 14, which lie below the tubes of the straight tube bundle 3, into each trough 2, 2 'of the fluidized bed apparatus. The space between the sloping side surfaces 10 of the tapered troughs 2.2 'serves as a vortex vapor distribution chamber for the fluidizing medium. The tubes of the straight tube bundle 3 are in the Troughs 2.2 'arranged so that there is a uniform division of the heating register, and open into an external steam condensate collecting space 6, which is designed as a condensate separator 8 and which lies in the fluidized bed. To support the individual straight pipes, they are guided at appropriate intervals through perforated plates 15, condensate separating devices being provided in particular in the vicinity of the outlet in a collecting chamber. The straight tube bundle is divided into several steam passages according to the criterion of the same entry velocity into the tube bundle or in the same mean flow velocity. This results in steam cross sections with two steam passages, which behave roughly like 90:10. However, if the straight tube bundle 3 has three steam passages, the number of tubes will behave as 78: 18: 4. In the case of four steam passages, the division numbers are 67: 22: 8: 3. In order to avoid thermal stresses, the straight tube bundle 3 is rigidly connected on one side, at least on the input side, in the first steam passages 4 to the vertical wall 5 of the trough 2, while on the output side or input side in the next steam passages, the combined collection and distribution chamber 6, 7 is designed as a floating head and expediently has condensate separating devices 8. In addition, the last collecting chamber 6 'or have the last tubes of the last steam passage 4,4˝, 4 ‴ ventilation outlets 9. In the arrangement of several troughs 2.2 ', a fluidized bed distribution chamber 11 is arranged between the troughs, in particular between their sloping side surfaces 10, so that each surface particle of the fluidized bed receives the same steam supply. The arrangement of several troughs 2.2 'in the fluidized bed takes into account the relatively large evaporation during coal drying and enables a homogeneous fluidized bed with approximately uniform flow velocities that hardly change over the entire fluidized bed. This also leads to a reduction in the vortex vapor volume, so that the drive energy for the circuit fan is reduced accordingly. The last collecting chamber 6 'or the pipes of the last steam passage have ventilation outlets 9, so that the air which separates out cannot act as a brake for the heat transfer by the constant increase.

Während in Fig. 1 die Schnittführung durch den Wirbelbetttrock­ner in Richtung des Geradrohrbündels 3 geführt ist, ist sie in Fig. 2 quer zu den Rohren geführt, und man erkennt die Vertei­lung des Wirbelfluids durch die perforierten Anströmrohre 14. Da durch die einzelnen Rohre des Geradrohrbündels immer gleiche Mengen Heizdampf geführt werden, ist auch eine gleichmäßige Wärmedehnung gegeben, so daß die einzelnen Schwimmköpfe auch auf einer gemeinsamen Rohrplatte angeordnet werden können, wo­durch sich eine weitere Vereinfachung ergibt. In diesem Sinn müssen die einzelnen Dampfgänge nicht untereinander bzw. über­einander angeordnet werden, sie können auch nebeneinander ver­laufen. Die Aufteilung in mehrere Dampfgänge hat auch den Vor­teil, daß das Kondensat nach dem ersten Dampfdurchgang stark verschmutzt ist und sich der Reinheitsgrad des Kondensates in den folgenden Dampfgängen bedeutend verbessert. Diese Trennung in stark und schwach verschmutztes Kondensat verbessert die Anwendungsmöglichkeit für weiter Wärmerückgewinnung. Zur besseren Kondensatabscheidung wird der Frischdampf durch die am tiefsten liegenden Rohre geführt und der jeweils entste­hende Abdampf durch die höher liegenden Rohre weiter konden­siert. Gleichzeitig wird das Kondensat an der tiefsten Stelle der kombinierten Sammel- und Verteilkammer abgeführt.While in FIG. 1 the cut is guided through the fluidized bed dryer in the direction of the straight tube bundle 3, in FIG. 2 it is guided across the tubes and the distribution of the vortex fluid through the perforated inflow tubes 14 can be seen. Because through the individual tubes of the straight tube bundle Always the same amounts of heating steam, there is even thermal expansion, so that the individual floating heads can also be arranged on a common tube plate, which results in a further simplification. In this sense, the individual steam ducts do not have to be arranged one below the other or one above the other; they can also run side by side. The division into several steam passages also has the advantage that the condensate is heavily contaminated after the first steam pass and the degree of purity of the condensate improves significantly in the subsequent steam passages. This separation into heavily and weakly contaminated condensate improves the application options for further heat recovery. For better condensate separation, the live steam is led through the lowest-lying pipes and the resulting exhaust steam condenses further through the higher-lying pipes. At the same time, the condensate is drained off at the lowest point in the combined collection and distribution chamber.

Claims (9)

1) Einrichtung zur indirekten Beheizung eines Wirbelbetttrockners durch einen von einem Fluid durchströmten Wärmetauscher, wobei das Wirbelbett in einem zumindest an zwei einander gegenüber­liegenden Seiten sich vom Anströmboden, nach oben erweiternden Gehäuse angeordnet ist, dadurch gekennzeichnet, daß das Gehäu­se (1) von mindestens einem Trog (2,2′) gebildet ist, in dem jeweils ein von kondensierendem Dampf durchströmter Wärmetau­scher in Form eines Geradrohrbündels (3) in mehreren Dampfgän­gen (4,4′,4˝,4‴) mit sich erheblich verringender Rohranzahl bzw. Dampfquerschnitt angeordnet ist.1) Device for the indirect heating of a fluidized bed dryer by a heat exchanger through which a fluid flows, wherein the fluidized bed is arranged in an at least on two opposite sides from the inflow floor, the housing expanding upwards, characterized in that the housing (1) of at least one Trough (2.2 ') is formed, in each of which a heat exchanger through which condensing steam flows in the form of a straight tube bundle (3) is arranged in a plurality of steam passages (4,4', 4˝, 4 ‴) with a significantly reduced number of tubes or steam cross section is. 2) Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei einem Geradrohrbündel (3) mit zwei Dampfgängen (4,4′) die Rohranzahl bzw. der Dampfquerschnitt sich etwa wie 90 : 10 bei gleicher Eintrittsgewindigkeit verhält.2) Device according to claim 1, characterized in that in a straight tube bundle (3) with two steam passages (4,4 '), the number of tubes or the steam cross-section behaves approximately like 90:10 with the same entry rate. 3) Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei einem Geradrohrbündel (3) mit drei Dampfgängen (4,4′,4˝) die Rohranzahl bzwq. der Dampfquerschnitt sich etwa wie 78 : 18 : 4 bei gleicher Eintrittsgeschwindigkeit verhält.3) Device according to claim 1, characterized in that in a straight tube bundle (3) with three steam passages (4,4 ', 4˝) the number of tubes or. the steam cross-section behaves approximately like 78: 18: 4 at the same entry speed. 4) Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei einem Geradrohrbündel (3) mit vier Dampfgängen (4,4′,4˝,4‴) die Rohranzahl bzw. der Dampfquerschnitt sich etwa wie 67 : 22 : 8 : 3 verhält.4) Device according to claim 1, characterized in that in a straight tube bundle (3) with four steam passages (4,4 ', 4˝, 4 ‴) the number of tubes or the steam cross-section behaves approximately as 67: 22: 8: 3. 5) Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Geradrohrbündel (3) zumindest eingangsseitig in den ersten Dampfgang (4) mit einer vertikalen Wand (5) des Troges (2) verbunden ist, während ausgangsseitig bzw. eingangsseitig in den nächsten Dampfgang die kombinierten Sammel- und Verteil­kammern (6,7) als Schwimmkopf ausgebildet sind.5) Device according to claim 1, characterized in that the straight tube bundle (3) at least on the input side in the first steam passage (4) with a vertical wall (5) of the trough (2) is connected, while the output side or input side in the next steam passage Combined collection and distribution chambers (6,7) are designed as floating heads. 6) Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die kombinierten Sammel- und Verteilkammern (6,7) Kondensatab­scheideeinrichtungen (8) aufweisen.6) Device according to claim 5, characterized in that the combined collecting and distributing chambers (6, 7) have condensate separating devices (8). 7) Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die letzte Sammelkammer (6′) bzw. die Rohre des letzten Dampfgan­ges (4′,4˝,4‴) Entlüftungsabgänge (9) aufweisen.7) Device according to claim 5, characterized in that the last collecting chamber (6 ') or the tubes of the last steam passage (4', 4˝, 4 ‴) have ventilation outlets (9). 8) Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei der Anordnung von mehreren Trögen (2,2′) zwischen den Trögen, insbesondere zwischen deren schrägen Seitenflächen (10), Wir­beldampfverteilungskammern (11) angeordnet sind.8) Device according to claim 1, characterized in that in the arrangement of several troughs (2,2 ') between the troughs, in particular between their oblique side surfaces (10), vortex vapor distribution chambers (11) are arranged. 9) Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die letzten Dampfgänge (4′,4˝,4‴) oberhalb des ersten Dampfganges (4) angeordnet sind.9) Device according to claim 7, characterized in that the last steam passages (4 ', 4˝, 4 ‴) are arranged above the first steam passage (4).
EP88121819A 1988-05-11 1988-12-29 Apparatus for the indirect heating of a fluidised bed Withdrawn EP0341347A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD315664 1988-05-11
DD31566488A DD271944B5 (en) 1988-05-11 1988-05-11 INDIRECTLY HEATED STEAM WHEEL LAYER DRYING SYSTEM

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EP0341347A1 true EP0341347A1 (en) 1989-11-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0819903A1 (en) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Brown coal drying plant
EP0819901A1 (en) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Browncoal drying plant
EP1933104A1 (en) * 2006-12-14 2008-06-18 Braunschweigische Maschinenbauanstalt AG Method and device for conditioning free-flowing fluidisable bulk solids
WO2010057509A1 (en) * 2008-11-24 2010-05-27 Rwe Power Aktiengesellschaft Indirectly heated fluidized bed dryer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200716A1 (en) * 1985-04-23 1986-11-05 Waagner-Biro Aktiengesellschaft Fluidized-bed dryer with heating surfaces
EP0255313A2 (en) * 1986-07-29 1988-02-03 Showa Aluminum Kabushiki Kaisha Condenser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200716A1 (en) * 1985-04-23 1986-11-05 Waagner-Biro Aktiengesellschaft Fluidized-bed dryer with heating surfaces
EP0255313A2 (en) * 1986-07-29 1988-02-03 Showa Aluminum Kabushiki Kaisha Condenser

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0819903A1 (en) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Brown coal drying plant
EP0819901A1 (en) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Browncoal drying plant
EP1933104A1 (en) * 2006-12-14 2008-06-18 Braunschweigische Maschinenbauanstalt AG Method and device for conditioning free-flowing fluidisable bulk solids
WO2010057509A1 (en) * 2008-11-24 2010-05-27 Rwe Power Aktiengesellschaft Indirectly heated fluidized bed dryer
CN102224388A (en) * 2008-11-24 2011-10-19 Rwe动力股份公司 Indirectly heated fluidized bed dryer
US20110283555A1 (en) * 2008-11-24 2011-11-24 Rwe Power Aktiengesellschaft Indirectly heated fluidized bed dryer
AU2008364234B2 (en) * 2008-11-24 2013-01-24 Rwe Power Aktiengesellschaft Indirectly heated fluidized bed dryer
RU2474777C1 (en) * 2008-11-24 2013-02-10 Рве Пауэр Акциенгезелльшафт Dryer with pseudoliquid layer with indirect heating
CN102224388B (en) * 2008-11-24 2013-10-02 Rwe动力股份公司 Indirectly heated fluidized bed dryer

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Publication number Publication date
DD271944B5 (en) 1993-12-02
DD271944A1 (en) 1989-09-20

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