EP0036102B1 - Drying installation - Google Patents

Drying installation Download PDF

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Publication number
EP0036102B1
EP0036102B1 EP81101261A EP81101261A EP0036102B1 EP 0036102 B1 EP0036102 B1 EP 0036102B1 EP 81101261 A EP81101261 A EP 81101261A EP 81101261 A EP81101261 A EP 81101261A EP 0036102 B1 EP0036102 B1 EP 0036102B1
Authority
EP
European Patent Office
Prior art keywords
drying unit
fluid
accordance
gas
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81101261A
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German (de)
French (fr)
Other versions
EP0036102A2 (en
EP0036102A3 (en
Inventor
Werner Dipl.-Ing. Poersch
Horst Ing. Grad. Sauter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grenzebach GmbH and Co KG
Original Assignee
Babcock BSH AG
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Filing date
Publication date
Application filed by Babcock BSH AG filed Critical Babcock BSH AG
Publication of EP0036102A2 publication Critical patent/EP0036102A2/en
Publication of EP0036102A3 publication Critical patent/EP0036102A3/en
Application granted granted Critical
Publication of EP0036102B1 publication Critical patent/EP0036102B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure

Definitions

  • the present invention relates to a drying system with a hot gas dryer fed from a fluid bed heating with hot gas.
  • the aim of the present invention is now to perfect a drying system of the type mentioned at the outset in such a way that the resulting thermal energy can be used to a high degree with little combustion effort.
  • An additional re-heating of the back vapors is achieved according to the invention in that a part of the back vapors is guided parallel to it via a heat exchanger introduced into the hot bed pocket of the fluidized bed.
  • a mixer can be arranged between the fluidized bed furnace and the hot gas dryer, in which the gases coming from the exhaust gas space of the fluidized bed furnace are mixed with the back vapors reheated in the heat exchanger.
  • the mixing ratio of the exhaust gases and back vapors can advantageously be adjustable via control devices.
  • a dust separator 3 of conventional design is connected between the hot gas dryer 1 and the fan 2.
  • the vapors can be partially discharged into the open via an adjustable branch 4 (arrow 5) or returned as vapors (arrow 6) by means of a fan 7 through the tubular windings of a heat exchanger 8, which is arranged in the fluidized bed 9 of a fluidized bed furnace 10, to the entrance of the hot gas dryer 1 will.
  • the return vapors first reach a mixer 11 arranged between fluidized bed furnace 10 and hot gas dryer 1, which is also connected to the exhaust gas space 13 of the fluidized bed furnace 10 via a further dust separator 12.
  • the feed lines to the mixer 11 are provided with regulating devices 14, 15 of known design, which allow the setting of a predetermined mixing ratio, e.g. 1: 1, allow.
  • the amount of air required to whirl up and maintain the combustion is supplied to the fluidized bed furnace 10 via the fan 16. It is driven with a minimal excess of air, since the construction volume of the fluidized bed furnace 10 and all auxiliary units, such as fuel distribution devices and flue gas dedusting, can be kept to a minimum.
  • the fuel supply for the fluidized bed combustion 10 is indicated by the arrow 17. Coal is preferably used as fuel.
  • the return vapor supply and the heat exchanger 8 are designed in such a way that the return vapor receive approximately the same temperature as the exhaust gases from the fluidized bed furnace 10.
  • the drying system described above is suitable, for example, for drying beet pulp.
  • the fuel particles discharged from the fluidized bed 9 with the flue gas are largely re-burned.
  • a part 6 "of the back vapors is led into the exhaust gas space 13 through a heat exchanger 8 'located in the hot bed pocket 18, which is for example drawn off from the fluidized bed 9 via the pipes 19. This also heats up the vapors again.

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

Description

Die vorliegende Erfindung betrifft eine Trocknungsanlage mit einem aus einer Wirbeibettfeuerung mit Heissgas gespeisten Heissgastrockner.The present invention relates to a drying system with a hot gas dryer fed from a fluid bed heating with hot gas.

Es ist bekannt, Wirbelbettfeuerungen als Heissgaserzeuger für Trocknungsprozesse zu verwenden (vgl. hierzu z.B. Zeitschrift "Chemical Engineering", Nov. 5, 1979, S. 77 u. 78).It is known to use fluidized bed furnaces as hot gas generators for drying processes (cf., for example, magazine " Chemical Engineering", Nov. 5, 1979, pp. 77 and 78).

Ferner ist es bei Trocknern mit Ölfeuerungen bekannt, einen Teil der Brüden, die vorher mit Feuergasen gemischt werden, in den Trockner zurückzuführen (vgl. z.B. DE-A Nr. 1604824).It is also known in the case of dryers with oil-fired systems to return some of the vapors, which are previously mixed with fire gases, to the dryer (cf. e.g. DE-A No. 1604824).

Ziel der vorliegenden Erfindung ist es nun, eine Trocknungsanlage der eingangs genannten Art derart zu vervollkommnen, dass bei geringem Feuerungsaufwand eine hohe Ausnutzung der entstehenden Wärmeenergie möglich ist.The aim of the present invention is now to perfect a drying system of the type mentioned at the outset in such a way that the resulting thermal energy can be used to a high degree with little combustion effort.

Das wird nach der Erfindung dadurch erreicht, dass zumindestens ein Teil der aus dem Heissgastrockner abgezogenen Brüden als Rückbrüden durch im Wirbelbett der Wirbelbettfeuerung befindliche Wärmetauscher geführt ist.This is achieved according to the invention in that at least some of the vapors drawn off from the hot gas dryer are led as back vapors through heat exchangers located in the fluidized bed of the fluidized bed furnace.

Hierdurch ist es möglich, die Verbrennungsführung im Wirbelbett bei relativ niedrigen Temperaturen (ca. 800°C) zu halten, was der Qualität der Abgase zugute kommt (niedriger NOx-Gehalt und einfache und billige Entschwefelung), und die indirekte Kühlung des Wirbelbettes durch die erfindungsgemässe Art der Brüdenrückführung erlaubt eine weniger aufwendige Bauweise der Wirbelbettfeuerung, als dies mit der sonst üblichen direkten Luftkühlung der Fall ist. Dabei wird zusätzlich ein Wiederaufheizen der Rückbrüden erreicht.This makes it possible to keep the combustion control in the fluidized bed at relatively low temperatures (800 ° C), what the quality of the exhaust gases benefits (low NOx content and easy and cheap desulfurization), and the indirect cooling of the fluidized bed through the type of vapor return according to the invention permits a less complex construction of the fluidized bed combustion than is the case with the otherwise usual direct air cooling. In addition, the vapors are reheated.

Ein zusätzliches Wiederaufheizen der Rückbrüden wird nach der Erfindung dadurch erreicht, dass ein Teil der Rückbrüden parallel dazu über einen in der heissen Bettasche des Wirbelbettes eingebrachten Wärmetauscher geführt ist.An additional re-heating of the back vapors is achieved according to the invention in that a part of the back vapors is guided parallel to it via a heat exchanger introduced into the hot bed pocket of the fluidized bed.

In Weiterführung des Erfindungsgedankens kann zwischen Wirbelbettfeuerung und Heissgastrockner ein Mischer angeordnet sein, in dem die aus dem Abgasraum der Wirbelbettfeuerung kommenden Gase mit den im Wärmetauscher wieder aufgewärmten Rückbrüden gemischt werden.In a continuation of the inventive concept, a mixer can be arranged between the fluidized bed furnace and the hot gas dryer, in which the gases coming from the exhaust gas space of the fluidized bed furnace are mixed with the back vapors reheated in the heat exchanger.

Dabei kann vorteilhafterweise das Mischverhältnis der Abgase und Rückbrüden über Regeleinrichtungen einstellbar sein.The mixing ratio of the exhaust gases and back vapors can advantageously be adjustable via control devices.

Die Erfindung sei nun anhand der in den Fig. 1 und 2 schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention will now be explained in more detail with reference to the exemplary embodiments shown schematically in FIGS. 1 and 2.

Hierin ist mit 1 ein Heissgastrockner bekannter Bauart bezeichnet, dessen Brüden über einen Ventilator 2 abgesaugt werden. Zwischen Heissgastrockner 1 und Ventilator 2 ist ein Staubabscheider 3 üblicher Bauart eingeschaltet. Die Brüden können über eine regulierbare Abzweigung 4 teilweise ins Freie (Pfeil 5) abgelassen oder als Rückbrüden (Pfeil 6) mittels Ventilator 7 durch die rohrförmigen Windungen eines Wärmetauschers 8, der im Wirbelbett 9 einer Wirbelbettfeuerung 10 angeordnet ist, zum Eingang des Heissgastrockners 1 rückgeführt werden. Dabei gelangen die Rückbrüden bei der Anordnung nach Fig. 1 zunächst in einen zwischen Wirbelbettfeuerung 10 und Heissgastrockner 1 angeordneten Mischer 11, der ausserdem über einen weiteren Staubabscheider 12 mit dem Abgasraum 13 der Wirbelbettfeuerung 10 in Verbindung steht.1 designates a hot gas dryer of known type, the vapors of which are sucked off by a fan 2. A dust separator 3 of conventional design is connected between the hot gas dryer 1 and the fan 2. The vapors can be partially discharged into the open via an adjustable branch 4 (arrow 5) or returned as vapors (arrow 6) by means of a fan 7 through the tubular windings of a heat exchanger 8, which is arranged in the fluidized bed 9 of a fluidized bed furnace 10, to the entrance of the hot gas dryer 1 will. In the arrangement according to FIG. 1, the return vapors first reach a mixer 11 arranged between fluidized bed furnace 10 and hot gas dryer 1, which is also connected to the exhaust gas space 13 of the fluidized bed furnace 10 via a further dust separator 12.

DieZuleitungen zum Mischer11 sind mit Regeleinrichtungen 14, 15 bekannter Bauart versehen, welche die Einstellung eines vorgegebenen Mischverhältnisses, z.B. 1:1, ermöglichen.The feed lines to the mixer 11 are provided with regulating devices 14, 15 of known design, which allow the setting of a predetermined mixing ratio, e.g. 1: 1, allow.

Über den Ventilator 16 wird die zur Aufwirbelung und Aufrechterhaltung der Verbrennung notwendige Luftmenge der Wirbelbettfeuerung 10 zugeführt. Es wird dabei mit minimalem Luftüberschuss gefahren, da hierbei das Bauvolumen der Wirbelbettfeuerung 10 und aller Hilfsaggregate, wie Brennstoffverteileinrichtungen und Rauchgasentstaubung, am kleinsten gehalten werden kann. Durch den Pfeil 17 ist die Brennstoffzufuhr für die Wirbelbettfeuerung 10 angedeutet. Als Brennstoff wird vorzugsweise Kohle verwendet.The amount of air required to whirl up and maintain the combustion is supplied to the fluidized bed furnace 10 via the fan 16. It is driven with a minimal excess of air, since the construction volume of the fluidized bed furnace 10 and all auxiliary units, such as fuel distribution devices and flue gas dedusting, can be kept to a minimum. The fuel supply for the fluidized bed combustion 10 is indicated by the arrow 17. Coal is preferably used as fuel.

Die Rückbrüdenzufuhr und der Wärmetauscher 8 sind so ausgelegt, dass die Rückbrüden in etwa die gleiche Temperatur wie die Abgase der Wirbelbettfeuerung 10 erhalten.The return vapor supply and the heat exchanger 8 are designed in such a way that the return vapor receive approximately the same temperature as the exhaust gases from the fluidized bed furnace 10.

Die oben beschriebene Trocknungsanlage ist beispielsweise zur Trocknung von Rübenschnitzeln geeignet.The drying system described above is suitable, for example, for drying beet pulp.

Bei der Trocknung weniger empfindlicher Stoffe, d.h. die, die mit den Stäuben aus der Wirbelbettfeuerung vermischt werden dürfen, können, wie in der Anordnung nach Fig. 2 dargestellt, der Staubabscheider 12 und der Mischer 11 aus der Anordnung gemäss Fig. 1 entfallen.When drying less sensitive fabrics, i.e. those that may be mixed with the dusts from the fluidized bed furnace can, as shown in the arrangement according to FIG. 2, dispense with the dust separator 12 and the mixer 11 from the arrangement according to FIG. 1.

Man erreicht dann eine gute Mischung der Rauchgase aus der Wirbelbettfeuerung 10 mit den Rückbrüden aus den Wärmetauschern 8 bzw. 8', wenn man die Rohre dieser Wärmetauscher im Abgasraum 13 der Wirbelbettfeuerung 10, also oberhalb des Wirbelbettes 9, enden lässt.A good mixture of the flue gases from the fluidized bed furnace 10 with the back vapors from the heat exchangers 8 and 8 'is then achieved if the tubes of these heat exchangers end in the exhaust gas space 13 of the fluidized bed furnace 10, i.e. above the fluidized bed 9.

Bei ausreichend hohem Sauerstoffgehalt der Rückbrüden werden hierbei die aus dem Wirbelbett 9 mit dem Rauchgas ausgetragenen Brennstoffteilchen weitgehend nachverbrannt.If the back vapors have a sufficiently high oxygen content, the fuel particles discharged from the fluidized bed 9 with the flue gas are largely re-burned.

Wie in der Fig. 2 ebenfalls schematisch dargestellt, wird ein Teil 6" der Rückbrüden durch einen in der heissen Bettasche 18, diez.B. über die Rohre 19 aus dem Wirbelbett 9 abgezogen wird, befindlichen Wärmetauscher 8' in den Abgasraum 13 geführt. Auch hierdurch erfolgt ein Wiederaufheizen der Rückbrüden.As also shown schematically in Fig. 2, a part 6 "of the back vapors is led into the exhaust gas space 13 through a heat exchanger 8 'located in the hot bed pocket 18, which is for example drawn off from the fluidized bed 9 via the pipes 19. This also heats up the vapors again.

Claims (7)

1. Drying unit comprising a hot-gas dryer fed with the hot gas from a fluid-bed furnace, characterized by recycling at least part of the vapours coming from the hot-gas dryer (1) through a heat exchanger (8) located in the fluidized bed (9) of the fluid-bed furnace (10).
2. Drying unit in accordance with claim 1, characterized by the heat exchanger (8) being connected with the waste-gas chamber (13) of the fluid-bed furnace (10) and the reheated, recycled vapours being passed into it.
3. Drying unit in accordance with claim 1, characterized by a mixer (11) being located between fluid-bed furnace (10) and hot-gas dryer (1), in which the gascoming from the waste-gas chamber (13) of the fluid-bed furnace (10) is mixed with the reheated recycled vapours.
4. Drying unit in accordance with claim 3, characterized by the mixing ratio of waste gas and recycled vapours being adjustable by regulating . facilities (14, 15).
5. Drying unit in accordance with claim 4, characterized by the mixing ratio of waste gas and recycled vapours being adjusted 1:1.
6. Drying unit in accordance with at least one of the claims 1 to 5, characterized by an additional heat exchanger (8') being provided and being in contact with the hot bed ash (18) and through which part (6") of the recycled vapours is passed.
7. Drying unit in accordance with at least one of the claims 1 to 6, characterized by the recycled vapour feed rate and the heat exchangers (8, 8') being so designed as to ensure that the recycled vapours have about the same temperature as the waste gas from the fluid-bed furnance (10).
EP81101261A 1980-03-13 1981-02-21 Drying installation Expired EP0036102B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803009565 DE3009565A1 (en) 1980-03-13 1980-03-13 DRYING SYSTEM
DE3009565 1980-03-13

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EP0036102A2 EP0036102A2 (en) 1981-09-23
EP0036102A3 EP0036102A3 (en) 1981-10-14
EP0036102B1 true EP0036102B1 (en) 1983-02-23

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EP81101261A Expired EP0036102B1 (en) 1980-03-13 1981-02-21 Drying installation

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DE (2) DE3009565A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608248C1 (en) * 1986-03-12 1987-08-13 Steinmueller Gmbh L & C Method of generating hot gas and hot-gas generator for implementing the method
GB8617045D0 (en) * 1986-07-12 1986-08-20 Mckechnie Metals Ltd Drying swarf &c
US7383790B2 (en) * 2005-06-06 2008-06-10 Emerson Process Management Power & Water Solutions, Inc. Method and apparatus for controlling soot blowing using statistical process control
AU2008247574B2 (en) * 2007-05-03 2012-03-22 Archer-Daniels-Midland Company A system for using heat to process an agricultural product, a fluidized bed combustor system, and methods of employing the same
CN101701763B (en) * 2009-11-24 2011-03-16 山东天力干燥设备有限公司 Positive-pressure combustion device and process thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589313A (en) * 1968-08-30 1971-06-29 Us Health Education & Welfare Solid waste disposal method and apparatus
US3779181A (en) * 1972-08-30 1973-12-18 Awt Systems Inc Fluid bed dryer and heat exchange system
US3805715A (en) * 1972-10-26 1974-04-23 Atomic Energy Commission Method for drying sludge and incinerating odor bodies
DE2412446A1 (en) * 1974-03-15 1975-09-18 Vits Maschinenbau Gmbh Conveyor drier for goods from an offset printing press - where a heat exchanger can receive part of the flue gas containing air for reheating
DE2616347C3 (en) * 1976-04-14 1983-12-01 Vits-Maschinenbau Gmbh, 4018 Langenfeld Continuous dryer for webs
US4096909A (en) * 1976-12-23 1978-06-27 Dorr-Oliver Incorporated Fluidized bed process heater
DE2727971C2 (en) * 1977-06-22 1983-07-14 Brückner-Apparatebau GmbH, 6120 Erbach Process for the thermal treatment of a web of material
DE2812966C2 (en) * 1978-03-23 1986-06-19 Brückner-Apparatebau GmbH, 6120 Erbach Process for the thermal treatment of a web of material
DE2802907A1 (en) * 1978-01-24 1979-07-26 Frings Naberschulte Gerd Malt kiln air conditioning system - uses glass tube heat exchanger in series with evaporator of heat pump for heat recuperation
CH641133A5 (en) * 1979-05-28 1984-02-15 Escher Wyss Ag METHOD FOR PROCESSING CLEANING SLUDGE.

Also Published As

Publication number Publication date
DE3160080D1 (en) 1983-03-31
DE3009565A1 (en) 1981-09-24
EP0036102A2 (en) 1981-09-23
EP0036102A3 (en) 1981-10-14

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