EP0207293A2 - Procédé et dispositif pour le séchage de produits sensibles à la chaleur ayant une humidité initiale élevée - Google Patents

Procédé et dispositif pour le séchage de produits sensibles à la chaleur ayant une humidité initiale élevée Download PDF

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Publication number
EP0207293A2
EP0207293A2 EP86107307A EP86107307A EP0207293A2 EP 0207293 A2 EP0207293 A2 EP 0207293A2 EP 86107307 A EP86107307 A EP 86107307A EP 86107307 A EP86107307 A EP 86107307A EP 0207293 A2 EP0207293 A2 EP 0207293A2
Authority
EP
European Patent Office
Prior art keywords
dryer
drying
products
dried
flight
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
EP86107307A
Other languages
German (de)
English (en)
Other versions
EP0207293B1 (fr
EP0207293A3 (en
Inventor
Rainer Brunner
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.)
Hermann Waldner GmbH and Co KG
Original Assignee
Hermann Waldner 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 Hermann Waldner GmbH and Co KG filed Critical Hermann Waldner GmbH and Co KG
Priority to AT86107307T priority Critical patent/ATE59900T1/de
Publication of EP0207293A2 publication Critical patent/EP0207293A2/fr
Publication of EP0207293A3 publication Critical patent/EP0207293A3/de
Application granted granted Critical
Publication of EP0207293B1 publication Critical patent/EP0207293B1/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
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it

Definitions

  • the invention relates to a method for drying heat-sensitive products which can be fluidized in the dried state and have a high initial moisture, e.g. Casein, lactose, proteins and the like, in a fluidized bed process.
  • a high initial moisture e.g. Casein, lactose, proteins and the like
  • the process is one-step, the dryer is a so-called long-term dryer, in which relatively small amounts of air are used in order to fluidize the product to be dried, but not entrained in the air flow, and relatively low air temperatures are set in order to prevent the coarse grain from becoming higher Moisture dries unevenly, is locally overheated and thereby baked, baked on or undergoes another quality reduction.
  • Pendulum rakes or other additional movement devices serve the same purpose in the entrance area of the fluid bed dryer which is referred to as the wet or accumulation zone. Nevertheless, the formation of deposits on the walls cannot be avoided. Since they represent bacterial sources, laborious and lengthy internal wet cleaning is required at least once a day.
  • the invention has for its object to provide a drying method of the type mentioned and a device suitable for its implementation, with the help of which the products to be dried faster than before, but still more evenly and with better security against partial overheating with their often harmful consequences can be.
  • the above object is achieved in that the products are predried in a first stage using the fly-bed method and then finish-dried in a second stage using the fluidized bed method.
  • Flight layer dryers which are also referred to as flight dryers or turbo flyer dryers, are short-term dryers. They atomize the product to be dried in a hot air stream that sweeps the particles away and dries them in seconds. Because of the high air temperature, the flight layer process for drying heat-sensitive products has not been considered. The practically unavoidable fluctuations in the initial moisture content, depending on the setting of the drying conditions, must necessarily lead to partial overheating or insufficient drying.
  • the surprisingly positive effect of the invention is due to the fact that the flight layer process is used according to the invention only for predrying.
  • the parameters are set so that the product to be dried after predrying is on the one hand dry enough to be able to fluidize evenly fine-grained at the feed point in the subsequent fluidized bed process (avoidance of the wet zone and its problems), and on the other hand the residual moisture is sufficient after the predrying to safely avoid heat damage in this first stage of the process.
  • the fluidized bed process can be larger due to the fine-grained pre-dried product Enforce air volume because it distributes itself evenly and reaches all particles, so that it also dries faster and, moreover, takes full advantage of its advantageous properties of gentle drying and precise control, since locally different coincidences are excluded during the transition from coarse grain high moisture to evenly fluidizable fine grain.
  • the invention offers the possibility of controlling the drying conditions in the case of finished drying in a fluidized bed process as a function of the moisture after predrying in the fly bed process, as a result of which the residual moisture can be kept constant with very good accuracy.
  • the new device for carrying out the method according to the invention thus consists of a fluid bed dryer which is known per se and which is preceded by a flight bed dryer which is also known per se.
  • a flight bed dryer which is also known per se.
  • two flight layer dryers are arranged in parallel, which can alternately be connected upstream of the fluid bed dryer. In this way, the drying process does not need to be interrupted when cleaning one of the flight layer dryers.
  • the system shown consists essentially of a fluid bed dryer 10 and two parallel flight layer dryers (turbo flight dryers) 12 and 14.
  • the latter is the product to be dried, eg. B. casein coming from a decanter, alternately via a mincer (mincer) 16 and an inlet tube 18.
  • Only one turbo flight dryer 12 or 14 need be in operation at a time.
  • the double arrangement allows continuous operation even during the day After cleaning one of the two dryers 12 or 14.
  • the fluid bed dryer 10 and the flight layer dryer 12 and 14 have a common supply air supply.
  • the supply air is drawn in and conditioned by an intake air filter 20.
  • a first blower 22 presses the supply air via a heater 24 either into one of the two flight layer dryers 12 or 14.
  • the switching between these takes place by means of two air flaps 26 and 28 with a pneumatic actuator, one of the air flaps being open and the other being closed.
  • the fluid bed dryer 10 is supplied separately with supply air in three separate zones.
  • a second blower 30 presses heated supply air via a heater 32 into the inlet zone denoted by 34 and via a heater 36 further heated supply air into the central zone 38 of the fluid bed dryer 10.
  • a third fan 40 conveys cooled supply air via a cooler 42 to the outlet zone 44 of the fluid bed dryer .
  • a cyclone 46 and 48 is assigned to the two flight layer dryers 12 and 14 in a known manner.
  • the product pre-dried in one of the flight dryer 12 or 14 arrives with its exhaust air in the associated cyclone 46 or 48 and is separated there, while the exhaust air is extracted via an air flap 50 or 52 with an actuator by an exhaust air blower 54 and via a further air flap 56 is promoted with an actuator to an outlet indicated at 58.
  • the exhaust air from the fluid bed dryer 10 is drawn off by a further exhaust air blower 60 via a cyclone 62 and conveyed to the outlet 58 (exhaust air filter not shown) via an air flap 64 with an actuator.
  • the supply air is distributed to the individual zones 34, 38, 44 of the fluid bed dryer 10 by means of air flaps 66, 68, 70 with actuator.
  • Two further air flaps 72 and 74 control the supply of feed air branched off behind the heater 32 to vibrating conveyor troughs 76 and 78, which connect the outlet of the cyclones 46 and 48 to the product inlet opening 80 of the fluid bed dryer 10. It goes without saying that only one cyclone 46 or 48 and a single vibrating conveyor trough 76 or 78 are present in systems with only a single flight layer dryer.
  • the drying conditions in the turbo flight dryer 12 and 14 are set so that the product then still has a moisture content of about 25 to 40%.
  • An initial moisture of 70% is e.g. B. reduced to a residual moisture of 30%. Because of this relatively high residual moisture in the finely divided state, the product takes on despite the usually high air temperature in the turbo Flight dryer no harm. However, it then maintains its fine-grained consistency and, in this immediately fluidizable state, reaches the inlet zone 34 of the fluidized bed dryer 10 via the product inlet opening 80.
  • the two-stage construction of the system with a turbo flight dryer for predrying and a fluidized bed dryer for finished drying offers the possibility between these two stages by means of an infrared moisture meter 96, which is preferably arranged at the outlet of the cyclone 46 or 48 behind the turbo flight dryer 12 or 14 is to constantly measure the moisture still present and to control the operating parameters, in particular the air quantity and temperature, of the turbo flight dryer 12 or 14 as a function of this measurement result.
  • the conditions in the fluidized bed dryer 10 can be controlled by sensors attached to it and, if necessary, also influenced by the infrared meter 96.
  • the fluid bed dryer only one or more than the three zones shown with each have different air supply and temperature.
  • the fluid bed dryer can be designed to be stationary or in a known manner as a vibration fluid bed dryer. It preferably has a round cross section and a pull-out and exchangeable inflow floor to adapt to different products.
  • the method described takes place under negative pressure.
  • the negative pressure contributes to the fact that the damp material is sucked into the dryer.
  • a particular advantage of the new process is that existing single-stage drying systems with fluid bed dryers can be converted to two-stage operation at relatively low cost, since the existing two-stage operation can also be carried out with the existing fluid bed dryer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP86107307A 1985-06-01 1986-05-29 Procédé et dispositif pour le séchage de produits sensibles à la chaleur ayant une humidité initiale élevée Expired - Lifetime EP0207293B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107307T ATE59900T1 (de) 1985-06-01 1986-05-29 Verfahren und vorrichtung zum trocknen von waermeempfindlichen produkten mit hoher anfangsfeuchte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3519750 1985-06-01
DE19853519750 DE3519750A1 (de) 1985-06-01 1985-06-01 Verfahren und vorrichtung zum trocknen von waermeempfindlichen produkten mit hoher anfangsfeuchte

Publications (3)

Publication Number Publication Date
EP0207293A2 true EP0207293A2 (fr) 1987-01-07
EP0207293A3 EP0207293A3 (en) 1988-05-11
EP0207293B1 EP0207293B1 (fr) 1991-01-09

Family

ID=6272242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107307A Expired - Lifetime EP0207293B1 (fr) 1985-06-01 1986-05-29 Procédé et dispositif pour le séchage de produits sensibles à la chaleur ayant une humidité initiale élevée

Country Status (3)

Country Link
EP (1) EP0207293B1 (fr)
AT (1) ATE59900T1 (fr)
DE (2) DE3519750A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014004815A1 (de) 2013-04-03 2014-10-09 Glatt Ingenieurtechnik Gmbh Rotationstrocknerstern und Verfahren zur Behandlung von Feststoffpartikeln
DE102013005921A1 (de) 2013-04-03 2014-10-09 Glatt Ingenieurtechnik Gmbh Fluidisierungsapparat

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT220075B (de) * 1957-06-14 1962-03-12 Hermann Orth Wirbel- und Flugschicht-Trockner
DE1729279C3 (de) * 1967-03-13 1975-05-28 Buettner-Schilde-Haas Ag, 4150 Krefeld Der Vortrocknung dienende Vorrichtung für Wirbelbett-Trockner
DD102799A1 (fr) * 1972-07-19 1973-12-20
DE2427932B2 (de) * 1974-06-10 1978-02-09 Bergwerksverband GmbH; Didier Engineering GmbH; 4300 Essen Flugstromtrockner mit eine diffusorartige engstelle aufweisendem trocknungsrohr
DE2544048A1 (de) * 1975-10-02 1977-04-21 Kloeckner Humboldt Deutz Ag Verfahren und einrichtung zur thermischen behandlung von nicht rieselfaehigen, klebrigen, klumpigen, temperaturempfindlichen materialien
DE3246461A1 (de) * 1982-12-15 1984-06-20 H. Orth GmbH, 6737 Böhl-Iggelheim Vorrichtung zur behandlung fluidisierbarer feststoffe im fliessbettverfahren

Also Published As

Publication number Publication date
EP0207293B1 (fr) 1991-01-09
ATE59900T1 (de) 1991-01-15
DE3676749D1 (de) 1991-02-14
EP0207293A3 (en) 1988-05-11
DE3519750A1 (de) 1986-12-04
DE3519750C2 (fr) 1988-06-16

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