EP0553089B1 - Verfahren und anlage zum trocknen von schütt- oder rieselfähigem trocknungsgut - Google Patents

Verfahren und anlage zum trocknen von schütt- oder rieselfähigem trocknungsgut Download PDF

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Publication number
EP0553089B1
EP0553089B1 EP91912501A EP91912501A EP0553089B1 EP 0553089 B1 EP0553089 B1 EP 0553089B1 EP 91912501 A EP91912501 A EP 91912501A EP 91912501 A EP91912501 A EP 91912501A EP 0553089 B1 EP0553089 B1 EP 0553089B1
Authority
EP
European Patent Office
Prior art keywords
drying
gas
zone
filter
dried
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 - Lifetime
Application number
EP91912501A
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German (de)
English (en)
French (fr)
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EP0553089A1 (de
Inventor
Harald Böhler
Franz Kettenbauer
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.)
Fritz Egger GmbH and Co OG
Original Assignee
Fritz Egger GmbH and Co OG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fritz Egger GmbH and Co OG filed Critical Fritz Egger GmbH and Co OG
Priority to AT91912501T priority Critical patent/ATE103702T1/de
Publication of EP0553089A1 publication Critical patent/EP0553089A1/de
Application granted granted Critical
Publication of EP0553089B1 publication Critical patent/EP0553089B1/de
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/08—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being arranged in a sinuous or zig-zag path

Definitions

  • the invention relates to a method and to a plant for drying bulk or free-flowing items to be dried, in particular wood chips or wood fibers, as described in the preamble of claims 1 and 5, respectively.
  • Such a method and such a system are known (DE-C 423 469).
  • wet lignite is dried with hot air in a two-stage process, whereby there is direct contact between hot air and the material to be dried.
  • the advantage of the two-stage process is that not only is the material to be dried dried, but also the drying air laden with impurities or dust through the drying process is filtered, the material to be dried itself forming the porous filter mass and being preheated or pre-dried in this cleaning step. Therefore, additional measures for cleaning the drying exhaust air may be omitted or at least simplified.
  • a lower drying zone and an upper filter zone are arranged within a common housing, to the top of which the material supply and the exhaust gas chimney are connected, while the hot air is supplied to the underside and the dried material is removed.
  • the filter zone is formed by two gas-permeable cylinder walls, which are arranged concentrically and vertically in the housing. As the supplied moist material slides down through the annular space between the two cylinder walls under the effect of gravity, all of the hot air that rises through the drying zone is passed on the underside of the filter zone into the inner cylinder wall, from where it flows essentially radially outward through the two cylinder walls and the material layer located between them, in order to then reach the chimney from the housing chamber formed outside the cylinder wall arrangement.
  • drying system for pressed bodies (pellets) made of hops, in which two air-permeable belt conveyors are arranged one above the other in chambers separated by a horizontal intermediate wall, the material to be dried being fed to the upper belt conveyor, from there to the lower belt conveyor and with it to the Good discharge is transported.
  • Warm drying air first rises through the material layer on the lower conveyor belt (drying zone), is then passed out of the lower drying chamber into a laterally arranged intermediate heater, from which it then flows into the upper chamber and through the drying material on the upper conveyor belt (filter zone ).
  • the entire drying air is passed both through the drying zone and through the filter zone, so that here, too, a possible formation of steam plumes cannot be prevented or can only be prevented by complex additional measures.
  • the invention has for its object to make the generic drying more adaptable to the starting and ambient conditions, so that simple drying is ensured even under unfavorable conditions.
  • Drying air is thus passed through the as yet non-dried material to be acted as a filter medium (filter layer), the pollutants or dust which are taken up and carried along in the drying zone during drying being removed again from the exhaust air.
  • filter layer a filter medium
  • the separated particles do not interfere in the material to be further processed.
  • sticky substances contained in or re-deposited in the shavings are even advantageous and lead to a reduction in the amount of binder to be mixed.
  • Air can advantageously be used as the drying gas if waste heat is available for heating this air within an overall system, for example otherwise difficult to use waste heat in the low temperature range, such as that used in the production of chipboard in the range of approx. 60 ° Celsius to 70 ° Celsius can occur, for example from a washing system for exhaust air from production systems (dryers, presses, etc.).
  • a washing system for exhaust air from production systems dryers, presses, etc.
  • the heat of condensation of water vapor contained in such exhaust air can then be used and considerable energy savings can be achieved.
  • this operating mode of the final dryer can be changed without loss of throughput so that the generation of emissions in the final dryer can be significantly reduced.
  • the system shown has a drying chamber 1 which has a feed 2 with an inlet lock 3 for the material 4 to be dried. This runs inside the drying chamber 1 first over an upper belt conveyor 5 and then over a lower belt conveyor 6, the two belt conveyors 5 and 6 being horizontal and arranged one above the other and connected to each other by an intermediate lock 7. At the discharge end of the lower belt conveyor 6, a discharge 8 with an outlet lock 9 is provided, which is followed by a discharge 10 for the dried material 4 to be dried. This flow path of the material to be dried through the drying chamber 1 is indicated by arrows.
  • the two belt conveyors 5 and 6 each have a rotating conveyor belt 11 or 12, which is porous or air-permeable, but is suitable as its carrier, taking into account the particle size of the drying material 4.
  • the upper run of the upper conveyor belt 11 forms a filter section 13, while the upper run of the lower conveyor belt 12 forms a drying section 14.
  • a filter zone 15 and a drying zone 16 are located above the corresponding sections 13 and 14, through which the material to be dried 4 passes in succession in the form of a layer, as shown in the drawing.
  • the arrow 17 illustrates the supply of air which flows through the drying chamber 1 from bottom to top, as indicated by the sequence of vertical arrows.
  • the air flows in from the outside via an air filter 18.
  • This air is heated in an air heater 19, which is operated by means of low-temperature waste heat, which is supplied, for example, with warm waste water through the heat exchanger line 20.
  • the heated air flows upwards through the drying section 14 of the lower conveyor belt 12 and through the drying material 4 located in the drying zone 16. This is heated and dried, while the air is loaded with moisture and entrains dusty particles 4 from the drying material.
  • the anteroom 25 below the lower belt conveyor 6 and the rear room 26 above the upper belt conveyor 5 are connected by a bypass line 27 to a control flap 28, so that heated air can be metered into the exhaust air 21, which is free of dust and pollutants from the material to be dried 4 is.
  • a bypass line 27 to a control flap 28, so that heated air can be metered into the exhaust air 21, which is free of dust and pollutants from the material to be dried 4 is.
  • Such an admixture of warm air can be particularly advantageous if, at low outside temperatures and without such an admixture of air, undesirable vapor vapor formation occurs due to the water vapor saturation of the exiting exhaust air.
  • a circulation line 29 is provided with a control flap 30 for the exhaust air, which is connected to the chimney 23 between the suction fan 22 and the control flap 24 and opens into the space 31 between the air filter 18 and the air heater 19, so that the recirculated exhaust air also is heated and, if necessary, mixes with outside air supplied according to arrow 17 in order to protect the air heater 19 and possibly also other system parts from frost risk at low outside temperatures.
  • the extent to which the air flowing through the drying zone 16 entrains particles and is loaded with pollutants, and the extent to which these substances are separated in the filter zone 15 depend on several factors, in particular on the properties of the material to be dried 4, its bulk height (layer thickness) and feed rate and the throughput or the flow rate of the air in the two zones 15 and 16. It is therefore provided that the corresponding values can be set or changed in order to achieve optimal results in adaptation to the material to be treated 4 to be treated . In particular, with different air flow velocities be worked in the drying zone 16 and in the filter zone 15, for example by designing these zones with different air flow cross-sections or different lengths with appropriate air guidance.
  • the system could be constructed in a manner not shown in such a way that it can through nozzles or in a fluidized bed or flight dryer, or by mechanical power such as e.g. in a vibration dryer, results in a movement of the material to be dried, which promotes rapid and / or uniform drying. With the goods to be moved in this way, there is an increased and normally disturbing or impermissible entrainment of small particles with the drying air.
  • the drying air in the filter zone being cleaned again, in which a bed height adapted to the behavior of the material to be dried and the flow rate are selected such that, when flowing through the drying air, a separation of particles carried in it is comparable to a deep bed fiber filter results in which these accumulate on the still moist drying material forming the filter layer. Therefore, the exhaust air can possibly be released into the atmosphere or used for other processes, for example also for a recirculation mode in the dryer, without additional exhaust air filters. In such a mode of operation, the system parts, in particular heat exchangers used for reheating, are no longer soiled to an extent that would only allow short operating times without complex cleaning devices.
  • the described passage of the heated drying air through a filter layer formed from material to be dried has the additional advantage that the material to be dried is in the filter layer is heated. It may well be that condensation of moisture from the drying air occurs on the cold material to be dried, which increases its filtering effect.
  • Automatic controls in particular controlled air volume and recirculated air control, can be used to adapt to fluctuating amounts and moisture in the drying material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP91912501A 1990-07-17 1991-07-17 Verfahren und anlage zum trocknen von schütt- oder rieselfähigem trocknungsgut Expired - Lifetime EP0553089B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91912501T ATE103702T1 (de) 1990-07-17 1991-07-17 Verfahren und anlage zum trocknen von schuettoder rieselfaehigem trocknungsgut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4022702A DE4022702C1 (enrdf_load_stackoverflow) 1990-07-17 1990-07-17
DE4022702 1990-07-17

Publications (2)

Publication Number Publication Date
EP0553089A1 EP0553089A1 (de) 1993-08-04
EP0553089B1 true EP0553089B1 (de) 1994-03-30

Family

ID=6410445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91912501A Expired - Lifetime EP0553089B1 (de) 1990-07-17 1991-07-17 Verfahren und anlage zum trocknen von schütt- oder rieselfähigem trocknungsgut

Country Status (4)

Country Link
EP (1) EP0553089B1 (enrdf_load_stackoverflow)
AU (1) AU8181791A (enrdf_load_stackoverflow)
DE (2) DE4022702C1 (enrdf_load_stackoverflow)
WO (1) WO1992001896A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015113530B3 (de) * 2015-08-17 2016-12-29 Stela Laxhuber Gmbh Bandtrocknungsanlage mit zwei Trocknungsebenen
IT202200015528A1 (it) * 2022-07-22 2024-01-22 Imal Srl Impianto per la lavorazione del legno

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217056A1 (de) * 1992-05-22 1993-11-25 Fritz Egger Gmbh Trockner für schütt- oder rieselfähiges Gut
DE4305543C2 (de) * 1993-02-20 1999-06-10 Schulz Verfahrenstechnik Gmbh Verfahren zur Trocknung eines auf einem Band geführten Produktes, insbesondere eines Schüttgutes, und Anlage zur Durchführung des Verfahrens
CN101922858B (zh) * 2010-07-02 2012-01-04 张君如 多层风干机
EP2650632B8 (en) * 2012-04-13 2015-09-23 Sociedad General De Aguas De Barcelona, S.A. Multiple product belt drier for drying pasty and/or powdery materials, particularly for drying sludges from treatment plants or biomass
IT201600125377A1 (it) * 2016-12-13 2018-06-13 Imal Srl Impianto per l'essiccazione di materiale legnoso incoerente
DE202017005817U1 (de) 2017-11-09 2017-12-01 Augenstein Maschinenbau GmbH Anlage zur Trocknung eines auf einem Band geführten Produktes
DE202018105738U1 (de) * 2018-10-08 2020-01-09 Pfeifer Holz Gmbh Anlage zum Herstellen von Klötzen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE408857C (de) * 1922-07-15 1925-01-28 Jens Rude Verfahren und Vorrichtung zur Rueckgewinnung von Staub bei Trocken- und Schwelanlagen
DE423469C (de) * 1923-03-25 1926-01-04 Louis Gumz Verfahren und Vorrichtung zum Entstauben der Abgase bei Trocknern
FR933669A (fr) * 1946-09-17 1948-04-28 Perfectionnements aux séchoirs pour étoupes
JPS5091868A (enrdf_load_stackoverflow) * 1973-12-17 1975-07-22
DE2601932C3 (de) * 1976-01-20 1979-01-04 Wibau (Westdeutsche Industrie- Und Strassenbau-Maschinen-Gesellschaft Mbh), 6466 Gruendau Verfahren zum Ausscheiden der in einem Trommeltrockner anfallenden staubförmigen und aerosol- bzw. gasförmigen Schadstoffe
US4045882A (en) * 1976-06-30 1977-09-06 Buffington James F Grain drying apparatus and process
DE2729015C3 (de) * 1977-06-28 1983-11-03 Lupofresh Allfeld & Egloff, 8500 Nürnberg Nachtrocknen von Hopfengut
DE3037438A1 (de) * 1980-10-03 1982-04-22 Ulrich 4020 Mettmann Walter Vorrichtung zum trocknen von schuettgut auf einem foerderband
DE3517433C2 (de) * 1985-05-14 1991-05-08 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Verfahren und Vorrichtung zur Verhütung von Bränden und Verpuffungen beim Trocknen von Holzspänen, Holzfasern od. dgl.
FR2607230B1 (fr) * 1986-11-20 1990-12-07 Bertin & Cie Installation industrielle de sechage d'un produit humide, du type a recirculation au moins partielle d'un fluide de sechage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015113530B3 (de) * 2015-08-17 2016-12-29 Stela Laxhuber Gmbh Bandtrocknungsanlage mit zwei Trocknungsebenen
IT202200015528A1 (it) * 2022-07-22 2024-01-22 Imal Srl Impianto per la lavorazione del legno
WO2024018430A1 (en) * 2022-07-22 2024-01-25 Imal S.R.L. Plant for wood machining

Also Published As

Publication number Publication date
AU8181791A (en) 1992-02-18
WO1992001896A1 (de) 1992-02-06
DE4022702C1 (enrdf_load_stackoverflow) 1991-11-28
EP0553089A1 (de) 1993-08-04
DE59101294D1 (de) 1994-05-05

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