EP0569558B1 - Installation d'evaporation pour le traitement des boues - Google Patents

Installation d'evaporation pour le traitement des boues Download PDF

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Publication number
EP0569558B1
EP0569558B1 EP92918423A EP92918423A EP0569558B1 EP 0569558 B1 EP0569558 B1 EP 0569558B1 EP 92918423 A EP92918423 A EP 92918423A EP 92918423 A EP92918423 A EP 92918423A EP 0569558 B1 EP0569558 B1 EP 0569558B1
Authority
EP
European Patent Office
Prior art keywords
product
cutting zone
wall
rotor
evaporation apparatus
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
EP92918423A
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German (de)
English (en)
Other versions
EP0569558A1 (fr
Inventor
Josef Egger
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.)
Buss AG
Original Assignee
Buss AG
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Filing date
Publication date
Application filed by Buss AG filed Critical Buss AG
Publication of EP0569558A1 publication Critical patent/EP0569558A1/fr
Application granted granted Critical
Publication of EP0569558B1 publication Critical patent/EP0569558B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the invention relates to an evaporator device for drying sludges in a thin layer, with a heatable, hollow cylindrical, approximately horizontally oriented evaporator body, which has a product inlet at one end and a product outlet at the other end and in the interior of which the product acts as a substantially arranged over the entire length of the evaporator body in the axial direction extending radially aligned blades, externally driven rotor, is arranged for applying the layer to be dried.
  • So-called thin-film or film evaporators for the evaporation of liquids, in particular also viscous liquids, have a tubular evaporator body in which the film of the liquid to be evaporated is mechanically applied by a stirring system to the inner wall of the cylindrical evaporator body by means of rigid stirring blades. This ensures that the hot surfaces of the evaporator body are wetted with a liquid film of uniform thickness over the entire length of the tube.
  • Thin-film evaporators of this type are described in LUEGER, Lexikon dertechnik, Volume 16, page 534.
  • Such an evaporator device has been used for years to dry moist materials, in particular sludges from sewage plants.
  • the sludge is applied in the form of a thin product film on the heated inner wall of the evaporator body through the blades of the inner rotating rotor, whereby the product is continuously conveyed through the evaporator body through the blades of the rotor and an at least partially dry granulate is obtained at the product outlet.
  • the problem with drying is that the material to be dried, which is introduced into the product inlet as a pumpable product, passes through a tough intermediate phase with decreasing water content, which leads to lump formation.
  • the invention is based on the object of designing an evaporator device of the type described at the outset in such a way that the formation of lumps in the critical zones is prevented and granules which are as uniform as possible are obtained as the end product.
  • the cutting zone is formed by at least one depression, in particular a groove-shaped depression, in the inner wall.
  • the cutting zone formed by a trough-shaped depression of the inner wall which leads to an increase in the distance between the outer edge of the wing and the cylinder wall, has the result that lumps rolling in the edge region of the wing and having a larger diameter than the normal gap distance between the edge of the wing and the cylindrical wall are trapped and thereby be broken up.
  • the depression can be formed in the form of a continuous channel or groove or in the form of a plurality of separate depressions which follow one another in the longitudinal direction of the interior.
  • the cutting zone is formed by at least one projection, in particular a web-shaped projection, of the inner wall.
  • a web-shaped projection With such a web-shaped projection, the normal gap between the wing edge and the inner wall of the evaporator body is slightly reduced.
  • a larger lump rolling in the area of the wing edge is held by the projection, so that the wing edge can break open the lump.
  • a plurality of linear cutting zones spaced approximately parallel to one another are provided.
  • a further embodiment has proven to be particularly favorable in this case, in which the cutting zones, based on the direction of rotation of the rotor, are arranged at least in the wall area covered by the upwardly rotating blades.
  • the "height" of the cutting zones is only a few millimeters in order to ensure that the product to be dried is still conveyed to the product outlet in a thin layer on the heated inner wall of the evaporator body.
  • the evaporator body 1 shown in FIG. 1 in a longitudinal section of a so-called evaporator device to be operated as a thin-film dryer essentially consists of a cylindrical tube 2, which in the exemplary embodiment shown is composed of two tube sections. On the outside, the two pipe sections 2 are each surrounded at a distance by a jacket pipe 3, through which a heating chamber 4 is delimited, into which heating steam is introduced via a feed line 5 and the condensate that forms can be drawn off via a drain line 6.
  • the product to be dried is introduced into the interior 8 of the evaporator body in a pumpable, puncture-resistant or crumbly consistency via a product inlet 7.
  • the blades 10 of which end at a short distance from the inner wall 11 of the evaporator body 1, for example at a distance of about 6 mm the product is applied to the inner wall 11 in a correspondingly thin layer and thereby in Directed towards the other end of the evaporator body.
  • the rotor has, at least in the inlet area, vane sections which are positioned at an angle to the longitudinal axis and thus act as conveying vanes.
  • the mass introduced After passing through about a quarter to a third of the total length, under the action of the heating medium, whereby the interior of the evaporator body can be kept slightly under vacuum to improve the evaporation performance, the mass introduced passes through its so-called tough phase.
  • the mass introduced passes through its so-called tough phase.
  • the inner wall of the evaporator body 1 is designed as a cutting zone 13 up to the product outlet 12.
  • the cutting zone is formed by a plurality of linear web-shaped projections 14 which protrude into the interior at a height of only a few millimeters.
  • the height of the projections can be, for example, 3 mm.
  • the projections arranged at a distance of, for example, 100 mm from one another are now like the sectional illustration in FIG.
  • the cutting zones can also be formed by corresponding outward-pointing, preferably channel-shaped depressions in the inner wall 11. Also through such recesses in the wall larger clumps located on the wings, which are larger in diameter than the normal gap between the wing edge and the inner wall, are held by the edge of the channel-shaped depression, so that here again the wing edge can break up the clumps.
  • a trough-shaped depression or a web-shaped projection is arranged as a cutting zone on the inner wall.
  • the cutting zones can, as shown, be aligned axially parallel or, at a small angle, measured in relation to the longitudinal axis, can be aligned in a helical line. Neither in a trough-shaped design nor in a web-shaped design it is necessary for the cutting zones to run over the full length, but instead they can be formed in a linear arrangement, by punctiform depressions or punctiform or web-shaped protrusions of short length.
  • projections these can be applied, for example, by cams, combs, pins or also by welding beads by means of surfacing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Claims (6)

  1. Installation d'évaporation destinée au séchage de boues dans une couche mince, comportant un corps d'évaporation en forme de cylindre creux pouvant être chauffé, orienté sensiblement à l'horizontale, qui présente à une extrémité une entrée (7) de produit et à l'autre extrémité une sortie (12) de produit, et dans l'espace intérieur alimenté en produit duquel est disposé pour l'application de la couche à sécher, un rotor (9) pouvant être entraîné de l'extérieur, muni d'ailettes (10) orientées radialement s'étendant sensiblement sur toute la longueur du corps d'évaporation dans le sens axial, caractérisée en ce que, au moins dans la zone située devant la sortie (12) de produit, la paroi (11) de l'espace intérieur est pourvue d'au moins une zone de découpe (13) s'étendant sensiblement dans le sens longitudinal de l'espace intérieur, et interrompant le contour circulaire de la section transversale de l'espace intérieur, dans laquelle, par coopération avec les ailettes (10), des agglomérats qui se développent sont fragmentés.
  2. Installation d'évaporation selon la revendication 1, caractérisée en ce que la zone de découpe (13) est formée par au moins un renfoncement de la paroi intérieure (11), notamment un renfoncement en forme de rainure.
  3. Installation d'évaporation selon la revendication 1 ou 2, caractérisée en ce que la zone de découpe (13) est formée par au moins une partie en saillie de la paroi intérieure (11), notamment une partie en saillie en forme de barrette (14).
  4. Installation d'évaporation selon l'une des revendications 1 à 3, caractérisée en ce que sont prévues plusieurs zones de découpe (13) de forme linéaire, s'étendant à une certaine distance à peu près parallèlement les unes aux autres.
  5. Installation d'évaporation selon l'une des revendications 1 à 4, caractérisée en ce que, par rapport au sens de rotation (15) du rotor (9), la zone de découpe (13) est disposée au moins dans la zone de la paroi qui est balayée par les ailettes (10) effectuant un mouvement ascendant au cours de leur rotation.
  6. Installation d'évaporation selon l'une des revendications 1 à 5, caractérisée en ce que la hauteur des zones de découpe (13) n'est que de quelques millimètres.
EP92918423A 1991-12-02 1992-08-25 Installation d'evaporation pour le traitement des boues Expired - Lifetime EP0569558B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9114967U DE9114967U1 (fr) 1991-12-02 1991-12-02
DE9114967U 1991-12-02
PCT/EP1992/001947 WO1993011396A1 (fr) 1991-12-02 1992-08-25 Installation d'evaporation pour le traitement des boues

Publications (2)

Publication Number Publication Date
EP0569558A1 EP0569558A1 (fr) 1993-11-18
EP0569558B1 true EP0569558B1 (fr) 1996-01-31

Family

ID=6873836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92918423A Expired - Lifetime EP0569558B1 (fr) 1991-12-02 1992-08-25 Installation d'evaporation pour le traitement des boues

Country Status (7)

Country Link
US (1) US5375343A (fr)
EP (1) EP0569558B1 (fr)
JP (1) JPH06505433A (fr)
AT (1) ATE133780T1 (fr)
DE (2) DE9114967U1 (fr)
ES (1) ES2085643T3 (fr)
WO (1) WO1993011396A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO176006C (no) * 1992-11-17 1995-01-18 Thermtech As Fremgangsmåte ved törking av materialer
AU682860B2 (en) * 1994-01-07 1997-10-23 Thermtech A/S A process and a device in drying of organic and/or unorganic materials
ES2080017B1 (es) * 1994-05-10 1996-07-16 Olmedilla Blas Bedmar Instalacion conjunta, continua y automatica para el secado y transformado de materias vegetales y animales.
DE19542301B4 (de) * 1995-11-14 2014-05-28 Pondus Verfahrenstechnik Gmbh Verfahren und Einrichtung zum Trocknen von schlammartigem Trockengut, insbesondere Klärschlamm
DE102007042006A1 (de) * 2007-09-04 2009-03-05 Reiflock Verwaltungs Gmbh Trocknungs-Vorrichtung für Klärschlämme
DE202015105780U1 (de) * 2015-10-30 2015-11-11 Josef Fliegl jun. Trocknungsvorrichtung
CA2960052C (fr) * 2016-03-07 2020-08-25 Electric Horsepower Inc. Appareil de chauffage a induction destine aux deblais de forage et autres materiaux, et methode
FI20195926A1 (en) 2019-06-12 2020-12-13 Aurotec Gmbh Device for handling thin films
WO2021116207A1 (fr) 2019-12-09 2021-06-17 Hellenes Holding As Appareil de séparation thermique continue d'une substance à composants multiples
AU2020402128A1 (en) 2019-12-09 2022-06-30 Grant Prideco, Inc. Method for continuous thermal separation of a multi-component substance

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102230C (fr) * 1898-05-04 1899-05-02
GB662303A (en) * 1949-07-13 1951-12-05 Charles Goodall Improvements relating to apparatus for the treatment of grass or other vegetable matter
FR1271497A (fr) * 1960-03-24 1961-09-15 Appareil perfectionné pour le séchage de matières pulvérulentes
US3292870A (en) * 1964-12-15 1966-12-20 Raymond M Lang Vegetation processing machine
US3313034A (en) * 1965-08-02 1967-04-11 Leo J Meyer Nut meat de-watering machine
GB1158191A (en) * 1966-07-20 1969-07-16 Henry Balfour And Company Ltd Improvements relating to Heat Exchangers.
DE2306856A1 (de) * 1973-02-12 1974-08-15 Wieneke Franz Verfahren zur trocknung von pflanzlichen produkten, wie korngut oder halmgut

Also Published As

Publication number Publication date
WO1993011396A1 (fr) 1993-06-10
DE59205253D1 (de) 1996-03-14
US5375343A (en) 1994-12-27
DE9114967U1 (fr) 1993-04-01
ATE133780T1 (de) 1996-02-15
EP0569558A1 (fr) 1993-11-18
ES2085643T3 (es) 1996-06-01
JPH06505433A (ja) 1994-06-23

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