EP0536650A1 - 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
EP0536650A1
EP0536650A1 EP92116877A EP92116877A EP0536650A1 EP 0536650 A1 EP0536650 A1 EP 0536650A1 EP 92116877 A EP92116877 A EP 92116877A EP 92116877 A EP92116877 A EP 92116877A EP 0536650 A1 EP0536650 A1 EP 0536650A1
Authority
EP
European Patent Office
Prior art keywords
dryer
impact surface
drying
heated
substance
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.)
Granted
Application number
EP92116877A
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German (de)
English (en)
Other versions
EP0536650B1 (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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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
    • F26B17/24—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 - in particular filter cakes, for example from press cakes from filter presses, centrifuges or the like. - under the influence of temperature.
  • the invention relates to a device for drying moist substances by means of a heated dryer with feed and discharge devices, which is suitable for carrying out that method.
  • the substance to be dried is thrown at high speed against an overheated baffle surface and a thin film is produced on it by means of the liquid extracted from the substance, which later evaporates.
  • the high speed is to be generated by the centrifugal force of an axially mounted turntable.
  • 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
  • the material to be dried is conveyed after filling in a dryer by means of a screw, namely 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 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.
  • a drying process can be optimally controlled in terms of process engineering and economics.
  • Suspensions has a base body 12 which tapers conically downwards and which is mounted 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 dryer 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 against the inclined container wall 33 of the centrifugal zone 32 at high speed. 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 dispensed liquid 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 down 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 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 dryer 10 can be filled until a maximum weight that 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. By comparing several successive gradients, the drying process can be stopped automatically if applicable G / t ⁇ y , where y is a value to be set.
  • 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. According to FIG. 4, 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 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).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Centrifugal Separators (AREA)
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 true EP0536650A1 (fr) 1993-04-14
EP0536650B1 EP0536650B1 (fr) 1996-03-27

Family

ID=6442460

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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
WO2004063649A1 (fr) * 2003-01-15 2004-07-29 Sundar Narayan Recuperation de combustible et d'argile a partir d'une biomasse
US9340741B2 (en) 2009-09-09 2016-05-17 Gas Technology Institute Biomass torrefaction mill
WO2018072870A1 (fr) * 2016-10-17 2018-04-26 Maag Automatik Gmbh Dispositif pour sécher des granulés
WO2018072871A1 (fr) * 2016-10-17 2018-04-26 Maag Automatik Gmbh Dispositif pour sécher des granulés

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005029985B4 (de) * 2005-06-28 2007-10-18 Reitz, Arnold, Dipl.-Ing. Strangfilterpresse
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

Citations (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
EP0254372A1 (fr) * 1986-07-24 1988-01-27 Stamicarbon B.V. Procédé et dispositif pour sécher des particules solides et poreuses
EP0411357A1 (fr) * 1989-08-01 1991-02-06 Besitzgesellschaft Möller mbH Dispositif pour séparer un fluide de particules solides
EP0448766A2 (fr) * 1990-03-28 1991-10-02 Alfred Bolz GmbH & Co. KG Séchoir malaxeur, ou dispositif pour l'usinage et le traitement de produits liquides, pâteux, humides et secs

Patent Citations (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
EP0254372A1 (fr) * 1986-07-24 1988-01-27 Stamicarbon B.V. Procédé et dispositif pour sécher des particules solides et poreuses
EP0411357A1 (fr) * 1989-08-01 1991-02-06 Besitzgesellschaft Möller mbH Dispositif pour séparer un fluide de particules solides
EP0448766A2 (fr) * 1990-03-28 1991-10-02 Alfred Bolz GmbH & Co. KG Séchoir malaxeur, ou dispositif pour l'usinage et le traitement de produits liquides, pâteux, humides et secs

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
WO2004063649A1 (fr) * 2003-01-15 2004-07-29 Sundar Narayan Recuperation de combustible et d'argile a partir d'une biomasse
US7481385B2 (en) 2003-01-15 2009-01-27 First American Scientific Corp. Recovery of fuel and clay from a biomass
US9340741B2 (en) 2009-09-09 2016-05-17 Gas Technology Institute Biomass torrefaction mill
WO2018072870A1 (fr) * 2016-10-17 2018-04-26 Maag Automatik Gmbh Dispositif pour sécher des granulés
WO2018072871A1 (fr) * 2016-10-17 2018-04-26 Maag Automatik Gmbh Dispositif pour sécher des granulés

Also Published As

Publication number Publication date
CZ307492A3 (en) 1993-06-16
DE59205833D1 (de) 1996-05-02
EP0536650B1 (fr) 1996-03-27
DE4133642C1 (fr) 1993-02-25
ATE136110T1 (de) 1996-04-15

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