EP0536650B1 - Procédé et dispositif pour sècher des substances humides - Google Patents

Procédé et dispositif pour sècher des substances humides Download PDF

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Publication number
EP0536650B1
EP0536650B1 EP92116877A EP92116877A EP0536650B1 EP 0536650 B1 EP0536650 B1 EP 0536650B1 EP 92116877 A EP92116877 A EP 92116877A EP 92116877 A EP92116877 A EP 92116877A EP 0536650 B1 EP0536650 B1 EP 0536650B1
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EP
European Patent Office
Prior art keywords
baffle surface
drying
substance
dried
turntable
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
EP92116877A
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German (de)
English (en)
Other versions
EP0536650A1 (fr
Inventor
Gerd Ph. Dr. Mayer
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.)
Alb Klein GmbH and Co KG
Original Assignee
Alb Klein GmbH and Co KG
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 Alb Klein GmbH and Co KG filed Critical Alb Klein GmbH and Co KG
Publication of EP0536650A1 publication Critical patent/EP0536650A1/fr
Application granted granted Critical
Publication of EP0536650B1 publication Critical patent/EP0536650B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F26B17/24—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by shooting or throwing the materials, e.g. after which the materials are subject to impact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the invention relates to a method for drying moist substances such as filter cakes, for example from press cakes from filter presses, centrifuges or the like. under the influence of temperature.
  • the invention also relates to a device for carrying out the method.
  • DE-AS 11 82 601 discloses a process for drying a protein-containing biological slurry after separating depot fat and centrifugal drying - ie with a moisture content of about 55 to 80% - in which the material itself, which has not been heated, is also repeated high centrifugal acceleration is thrown through a gaseous stream of desiccant against a heating surface with bubble evaporation temperature and is immediately removed therefrom.
  • the drying effect is to be achieved so that the so-called adhesive water precedes the protein compounds, atomizes on the heating surface and largely evaporates immediately.
  • the protein compounds do not come into contact with the heating surface themselves thanks to the leading adhesive water, which is supposed to form a kind of protective jacket, which prevents them from overheating.
  • a fixed drying cylinder with a heated wall is described as the device, the inner surface of which can be rough and which has a throwing bowl which can be rotated in the cylinder axis, a coaxial knife cross and a fan for drying agent arranged coaxially with the throwing bowl and knife cross.
  • the still older DE-AS 11 52 060 shows a process for the uninterrupted drying of preheated powdery or doughy goods such as coal sludge and minerals, when this is carried out the material is mechanically crushed and at the same time by hot gases under slight overpressure up to the evaporation temperature of the liquid is heated in the estate and then subjected to a shock.
  • the inventor has set the goal of improving the drying of moist substances of the type mentioned at the outset, namely above all of industrial filter cakes.
  • the substance to be dried is thrown at high speed by centrifugal forces against an overheated baffle and a part of the liquid adhering to the particle or to the fiber is separated from the latter to form a thin film on the baffle, after which the liquid film evaporates and the steam is discharged and the resulting dry substance is led downwards from the impact surface.
  • a mechanical effect preferably generated by the centrifugal force, should overlap the thermal drying with or without the use of vacuum technology, and automation and optimization of the thermal drying, evaluated in terms of process technology and economics, by using a gravimetric measuring principle.
  • Vacuum drying is always the best solution to a drying problem if the product to be dried is damaged at a higher temperature. This drying is also advantageous if drying must be carried out in the absence of oxygen, toxic or harmful by-products of the drying should not be emitted in an uncontrolled manner, or also if one wishes to work under clean room conditions. Also e.g. the recovery of solvents possible.
  • N mix cFr * wherein c is a regression parameter which, for example, assumes a value of 9 for paddle dryers and a value of 25 for disk dryers. 1 / N mix 0.2 ... 0.3
  • Fr (2 n) ⁇ 2nd .D / 2g where is the speed of the mixing tool and D its diameter.
  • the material to be dried is conveyed in a dryer by means of a screw after filling, to a turntable arranged according to the invention in its upper region and movable about the axis of the dryer, with a heated baffle surface of the vessel wall opposite its edge region is arranged.
  • the dryer In order to use the gravimetric principle in the thermal drying affected here, the dryer, decoupled from the periphery or flexibly connected to it, is set as a unit completely on pressure transducers which are coupled to one another; with a rigid connection to the periphery and the possibility of transmitting occurring moments, the weight measurement is at least falsified.
  • the change in weight or the current weight can be recorded in a freely programmable control. As a result, a drying process can be optimally controlled in terms of process technology and economy.
  • Froude numbers can be realized with the least effort and with great success, which are in the range of about 25 and more, with the advantage of a construction of small dimensions.
  • Suspensions has a base body 12 which tapers conically downwards and which is supported on pressure transducers 16 with brackets 15 which project laterally from its outer wall 14.
  • the interior 18 of the base body 12 is connected at the bottom to a pipeline 24 by means of a flexible bellows tube 22 assigned to a slide 20 and receives a screw conveyor 26 which runs in the area of the vertical axis A of the drying container 10 in a heated delivery channel 28 .
  • the latter is connected by radial pipes 29 and 29 a to an inlet 30 and outlet 30 a for heating medium.
  • a centrifugal zone 32 continuing its outer contour can be seen in FIG. 1 with a turntable 34 moved about that vertical axis A. Its plate edge 35 is directed downward at an angle of, for example, 30 ° and faces an impact surface 36.
  • the centrifugal zone 32 is spanned by a vessel cover 38 which carries a worm drive 39 and a pipe socket 42 which is inclined to the vertical axis A and offers a side pipe 40.
  • the moist material to be dried is transferred to the turntable 34 at the upper end of the conveyor section 26/28, the speed of which is either decoupled from the speed of the screw conveyor 26 or is a multiple of the screw speed via a transmission gear.
  • the moist material is accelerated on the turntable 34 and thrown at high speed against the inclined container wall 33 of the centrifugal zone 32. There is a separation between the liquid adhering to the particle or the fiber and the particle itself.
  • the container wall 33 is locally overheated in the impact area B thanks to the inflow of heating medium through a line 44 and a nozzle 46.
  • the liquid dispensed is distributed in the form of a thin film on the inside of the overheated container wall 33.
  • the impact does not release the entire amount of liquid carried.
  • the particle or the fiber either slides downward due to the incline of the container wall 33 - with additional liquid being able to be dispensed - or it initially sticks to the container wall 33 due to liquid adhesive forces.
  • the amount of liquid transferred, designed as a locally limited film, is unstable because closed surface tension forces cannot be applied. Under the action of an applied vacuum and / or the locally overheated container wall 33, the liquid is rapidly converted into the vapor state. This steam is quickly withdrawn to the outside via line 48.
  • the liquid bridge (gusset liquid) is also evaporated quickly, so that the adhesive force falls below the amount required to hold the particle or the fiber.
  • a revolving one indicated at 50 Scraper can be attached, which causes the particles to be forced downwards.
  • the solid which collects in the lower part of the dryer 10 is further dried by the action of heating on all sides and a vacuum. The process can be repeated any number of times by permanent relocation.
  • the drying time is not a rigid, fixed size, but must be kept variable: the drying container 10 can be filled until a maximum weight, which is adjustable within technical limits, is reached. The filling process is then carried out by closing e.g. of the slide 20 ended. The onset of the drying process results in a reduction in weight due to the removal of evaporating liquid.
  • FIG. 2 A typical course of the decreasing weight as a function of the drying time is shown in FIG. 2.
  • the solids weight F in kg is plotted over the drying time t in seconds, line G showing the weight of the dry solid and line M the maximum fill weight. If the dryer volume is limited, the maximum weight depends on the specific material density and the bulk density of the material. It is freely definable within the technical limits.
  • the filling time (variable by weight measurement) is denoted by t F
  • t * the aborting time for drying is denoted by t *.
  • the drying process is usually ended after a fixed drying time, when using the gravimetric principle, the drying time can be kept variable by measuring a gradient G / t.
  • the drying process can be stopped automatically by comparing several successive gradients if G / t ⁇ y, where y is a value to be defined.
  • Different solids concentrations / liquid contents can be processed: if a dryer is set to a fixed drying time and the input liquid content fluctuates considerably, the drying result is not sufficient.
  • the use of gravimetric measurement can automatically extend the drying time if, with the same input weight, there was a lower solids concentration and more liquid evaporates.
  • Liquids of different consistencies can be evaporated variably in one system. 5
  • an abort time t * s is set for a liquid which is difficult to evaporate (curve III). If the liquid changes or only a part of the liquid properties, the gravimetric principle can automatically shorten (or also extend) the drying time to t * L , where t * L is the break-off time for easily evaporable liquids (curve IV).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Centrifugal Separators (AREA)

Claims (11)

  1. Procédé pour le séchage des substances mouillées, spécialement des gâteaux de filtre-presse, par exemple des gâteaux de presse des filtres presses, des machines centrifuges ou de telle sorte, par l'effet de température, procédé par lequel on projete la substance à sécher à une vitesse élevée par force centrifuge contre une surface de collision surchauffée, une partie du liquide adhérant aux particules ou à la fibre se séparant par la formation d'un film mince sur la surface de collision, après quoi le film liquide s'évapore, la vapeur sort et la matière se formant est guidée vers le bas à partir de la surface de collision.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on projete la substance à sécher contre une surface de collision inclinée et que la substance glisse vers le bas en étant guidée par ladite surface.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le procédé est exécuté sous vide.
  4. Procédé selon l'une des revendications 1 à 3 caractérisé en ce que la matière sèche formée sera séchée ultérieurement au dessous de la surface de collision.
  5. Dispositif de mise en oeuvre du procédé selon au moins une des revendications précédentes, caractérisé en ce que pour le séchage des substances mouillées une surface de collision (36) est prévue entre une amenée (tubulure 42) et une évacuation (tuyau annelé 22) dans un récipient de séchage (10) et ladite surface se trouve en relation avec un plateau tournant (34) chauffé pour la substance à sécher, la surface de collision annulaire (36) se rétrécissant au moins vers le bas dans sa zone inférieure.
  6. Dispositif selon la revendication 5, caractérisé en ce que la surface de collision se trouve sous vide.
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que la zone périphérique (35) du plateau tournant (34) est inclinée vers le bas.
  8. Dispositif selon au moins une des revendications 5 à 7, caractérisé en ce que le récipient de séchage (10) ayant une hélice axiale de transport (26) vers le plateau tournant (34), le récipient de séchage se rétrécissant en forme de cône à partir de la surface de collision (36).
  9. Dispositif selon la revendication 8, caractérisé en ce que l'hélice de transport (26) entraînée en rotation se trouve dans un cylindre chauffant (28) entourant l'hélice.
  10. Dispositif selon au moins une des revendications 5 à 9, caractérisé en ce que le récipient de séchage (10) est logé sur des capteurs de force (16).
  11. Dispositif selon la revendication 10, caractérisé en ce que les capteurs de force (16) sont couplés les uns avec les autres.
EP92116877A 1991-10-11 1992-10-02 Procédé et dispositif pour sècher des substances humides Expired - Lifetime EP0536650B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4133642 1991-10-11
DE4133642A DE4133642C1 (fr) 1991-10-11 1991-10-11

Publications (2)

Publication Number Publication Date
EP0536650A1 EP0536650A1 (fr) 1993-04-14
EP0536650B1 true EP0536650B1 (fr) 1996-03-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92116877A Expired - Lifetime EP0536650B1 (fr) 1991-10-11 1992-10-02 Procédé et dispositif pour sècher des substances humides

Country Status (4)

Country Link
EP (1) EP0536650B1 (fr)
AT (1) ATE136110T1 (fr)
CZ (1) CZ307492A3 (fr)
DE (2) DE4133642C1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10221367B4 (de) 2002-05-13 2006-05-11 Bankwitz, Robert, Dr. Pneumatischer Schleudertrockner
CA2416402A1 (fr) * 2003-01-15 2004-07-15 First American Scientific Corporation Recuperation de carburant et d'argiles d'une biomasse
DE102005029985B4 (de) * 2005-06-28 2007-10-18 Reitz, Arnold, Dipl.-Ing. Strangfilterpresse
US9340741B2 (en) 2009-09-09 2016-05-17 Gas Technology Institute Biomass torrefaction mill
DE202016006420U1 (de) * 2016-10-17 2016-11-07 Maag Automatik Gmbh Vorrichtung zur Trocknung von Granulatkörnern
DE202016006421U1 (de) * 2016-10-17 2016-11-07 Maag Automatik Gmbh Vorrichtung zur Trocknung von Granulatkörnern
WO2021037913A1 (fr) 2019-08-27 2021-03-04 Nanonord A/S Procédé et système de détermination d'une concentration de graisse dans un échantillon fluide par résonance magnétique nucléaire

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152060B (de) * 1957-05-24 1963-07-25 Rubin Lipchitz Verfahren und Vorrichtung zum ununterbrochenen Trocknen von pulvrigen oder teigigen Guetern, z. B. Kohleschlamm, Mineralien
DE1182601B (de) * 1960-12-19 1964-11-26 Getreidehandel Ag Ges Verfahren und Trocknungszylinder zum Trocknen biologischer, breiiger Gueter
AT305212B (de) * 1970-08-07 1973-02-12 Buss Ag Zerstäubungstrockner
DE3009332A1 (de) * 1979-03-13 1980-10-02 Yasuro Ito Verfahren und vorrichtung zur einstellung der auf feinem zuschlagstoff abgeschiedenen fluessigkeitsmenge, sowie verfahren zur herstellung von moertel oder beton
NL8701108A (nl) * 1986-07-24 1988-02-16 Stamicarbon Inrichting voor het behandelen van poedervormig materiaal.
DE3925458A1 (de) * 1989-08-01 1991-02-07 Korrosionsforsch Gmbh Verfahren und vorrichtung zum abtrennen einer fluessigkeit von feststoffpartikeln
DE4009926A1 (de) * 1990-03-28 1991-10-02 Bolz Alfred Gmbh Co Kg Mischtrockner bzw. vorrichtung zum be- und verarbeiten von fluessigen, pastoesen, feuchten und trockenen produkten

Also Published As

Publication number Publication date
CZ307492A3 (en) 1993-06-16
EP0536650A1 (fr) 1993-04-14
DE59205833D1 (de) 1996-05-02
ATE136110T1 (de) 1996-04-15
DE4133642C1 (fr) 1993-02-25

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