EP0187173A1 - Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material - Google Patents

Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material Download PDF

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Publication number
EP0187173A1
EP0187173A1 EP84201959A EP84201959A EP0187173A1 EP 0187173 A1 EP0187173 A1 EP 0187173A1 EP 84201959 A EP84201959 A EP 84201959A EP 84201959 A EP84201959 A EP 84201959A EP 0187173 A1 EP0187173 A1 EP 0187173A1
Authority
EP
European Patent Office
Prior art keywords
mixing
drying
container
mass
product
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.)
Pending
Application number
EP84201959A
Other languages
English (en)
French (fr)
Inventor
Jan Willem De Vries
Hendrik Harm Garst
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.)
Isem BV
Original Assignee
Isem BV
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 Isem BV filed Critical Isem BV
Priority to EP84201959A priority Critical patent/EP0187173A1/de
Publication of EP0187173A1 publication Critical patent/EP0187173A1/de
Pending 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
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems

Definitions

  • the invention relates to a process for drying and homogenisation of materials containing liquid, which are subjected to a mixing operation by means of one or more mixing means in a closed drying/mixing container through heat supplied to the mixture and suction of the obtained vapour from the container.
  • Said process is known and is used for all kinds of materials, e.g. in the food products, pharmaceutical and chemical industries.
  • the heat supply is effected in that the mixing container is constructed with a double wall, a heating fluid, e.g. steam, being carried through the chamber between both walls thereof.
  • This known process has several disadvantages.
  • the heat exchange is a two-dimensional heat exchange, whereby a temperature gradient is present in the product mass so that temperature fluctuations will occur, which are often disadvantageous for the product.
  • Some products dissociate above a predetermined temperature, other become sticky, whereby they adhere to the wall of the mixing/drying container and/or to the mixing elements. Due to this adhesicn to the wall a strong increase of the heat resistance of the wall occurs due to the insulating properties of the product, and thereby an increase of the drying time of the product.
  • a long drying time is necessary due to the fact that also the product absorbs heat, during which time the mixing operation continues. Some products are damaged by the continuous rubbing effect or they loose their granular shape or stick together in that the liquid is not removed quickly enough.
  • the invention aims at removing the said disadvantages.
  • the high frequency vibration energy is only absorbed by molecules having a dipole.
  • the molecules of about 95% of the solvents used in the industry have a dipole, otherwise stated they are polar substances.
  • the solvent therefore absorbs the energy and is heated and vaporized thereby and is removed from the mixing/drying container by suction, whereas the product is not heated by the high frequency energy. Therefore much less heat has to be supplied per unitj of volume so that the drying time is considerably shortened.
  • the product mass therefore, during drying is for a much shorter period exposed to the mechanical influence of the mixing process and therefore is not damaged..
  • the high frequency energy is irradiated towards the free surface of the mass to be mixed, said surface constituting the boundary between the space taken by said mass in the mixing/drying container and the remaining space from which the solvent vapour is exhausted.
  • the vibration energy imparted to the material and therefore the generated heat is proportional to the frequency and to the dielectrical constant. Since a polar material has a high dielectrical constant, contrary to a little polar material the product, substantially only the solvent is heated.
  • the vibration energy has a predetermined penetration depth so that only the solvent in the boundary layer is vaporized. Due to the continuous mixing in the container, the boundary layer is constantly changed and after some time the solvent in the total mass has been heated and vaporized.
  • a correct mixing, minimal damage and short drying times are obtained if the mixing/drying is carried out in a conical mixing container including a mixing screw which is simultaneously rotatable around its own axis and around the container axis.
  • the invention also includes a mixer for carrying out the process according to claim 1 or 2, in which mixer one or more high frequency generators are secured to the outer wall of the container.
  • the mixer/dryer as shown has a conical vessel 1 which is suspended through the intermediary of supports and/or a carrier ring (not shown) in a concrete and/or steel structure and provided with a discharge spout 2 and with an upper cover 3 closing the mixing/ drying container.
  • a drive unit 4 is mounted on the cover, said unit comprising two electromotors and transmission means to which inside the container a pivotable arm 5 is connected carrying a mixing screw 6.
  • the drive and transmission means are such that the mixing screw 6 may be rotated due to the rotation of the output shaft 7 of the drive 4 along the interior of the conical wall of the mixing container 1 and also the mixing screw 6 may be rotated around its own axis.
  • a product mass 8 is present within the container 1 and comprises material containing liquid. Due to the operation of the mixing screw 6 said product mass may be mixed into a homogeneous mass.
  • a generator 9 of high frequency vibration energy is secured in a certain position on the exterior of the mixing/drying container.
  • a generator 9 is provided on the cover 3 of the mixer. Different locations as well as more than one generator 9 belong to the possibilities.
  • the vibration energy issued by the generator 9 is proportional to the frequency thereof and to the dielectrical constant of the solvent. Since the dielectrical constant of the product material itself is much lower than that of the solvent, the energy is converted into heat substantially only in the solvent.
  • the power of the vibration generator may be controlled in conformity therewith. If said power is decreased less heat per unity of time is generated.
  • the penetration depth of the high frequency waves into the surface of the mass is larger in accordance with the frequency and the dielectrical constant of the product material or the liquid respectively being smaller. Should the penetration depth be. too large, then at that depth the- vaporized liquid cannot escape quickly enough and yet a local superheating of the product could occur. Therefore the penetration depth must not be too large. It can also be adjusted by changing the power of the vibration generator.
  • the process according to the invention may be applied to all different Xinds of dryers in which simultaneously the products are homogenised.
  • the axis of rotation of the mixing screw may extend horizontally as well as vertically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biotechnology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Solid Materials (AREA)
EP84201959A 1984-12-31 1984-12-31 Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material Pending EP0187173A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP84201959A EP0187173A1 (de) 1984-12-31 1984-12-31 Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84201959A EP0187173A1 (de) 1984-12-31 1984-12-31 Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material

Publications (1)

Publication Number Publication Date
EP0187173A1 true EP0187173A1 (de) 1986-07-16

Family

ID=8192511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201959A Pending EP0187173A1 (de) 1984-12-31 1984-12-31 Verfahren und Apparat zum Trocknen und Homogenisieren von flüssigkeitsenthaltendem Material

Country Status (1)

Country Link
EP (1) EP0187173A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306563A1 (de) * 1987-09-10 1989-03-15 Hosokawa Micron Europe B.V. Vorrichtung zum Trocknen von lösungsmittelhaltigem Material
EP0498295A1 (de) * 1991-02-06 1992-08-12 Krauss-Maffei Aktiengesellschaft Mischertrockner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913238A (en) * 1972-07-20 1975-10-21 Day J H Co Method and apparatus for drying particulate materials
US4087921A (en) * 1976-10-12 1978-05-09 Arie Blok Microwave drying apparatus
US4104804A (en) * 1974-04-18 1978-08-08 Sargeant Ralph G Method for drying explosive materials
EP0005552A2 (de) * 1978-05-23 1979-11-28 Bruno Granella Erwärmungs- und Mischanlage für Baustoffe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913238A (en) * 1972-07-20 1975-10-21 Day J H Co Method and apparatus for drying particulate materials
US4104804A (en) * 1974-04-18 1978-08-08 Sargeant Ralph G Method for drying explosive materials
US4087921A (en) * 1976-10-12 1978-05-09 Arie Blok Microwave drying apparatus
EP0005552A2 (de) * 1978-05-23 1979-11-28 Bruno Granella Erwärmungs- und Mischanlage für Baustoffe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306563A1 (de) * 1987-09-10 1989-03-15 Hosokawa Micron Europe B.V. Vorrichtung zum Trocknen von lösungsmittelhaltigem Material
EP0498295A1 (de) * 1991-02-06 1992-08-12 Krauss-Maffei Aktiengesellschaft Mischertrockner
US5255444A (en) * 1991-02-06 1993-10-26 Krauss-Maffei Aktiengesellschaft Microwave drying/mixing apparatus

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: DE VRIES, JAN WILLEM

Inventor name: GARST, HENDRIK HARM