EP0036362B1 - Vorrichtung zur thermischen Behandlung pulverförmiger oder körniger Stoffe - Google Patents

Vorrichtung zur thermischen Behandlung pulverförmiger oder körniger Stoffe Download PDF

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Publication number
EP0036362B1
EP0036362B1 EP81400375A EP81400375A EP0036362B1 EP 0036362 B1 EP0036362 B1 EP 0036362B1 EP 81400375 A EP81400375 A EP 81400375A EP 81400375 A EP81400375 A EP 81400375A EP 0036362 B1 EP0036362 B1 EP 0036362B1
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EP
European Patent Office
Prior art keywords
screw
treated
materials
sleeve
pitch
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
Application number
EP81400375A
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English (en)
French (fr)
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EP0036362A1 (de
Inventor
Joel Soulier
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Individual
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Individual
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Priority to AT81400375T priority Critical patent/ATE8091T1/de
Publication of EP0036362A1 publication Critical patent/EP0036362A1/de
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Publication of EP0036362B1 publication Critical patent/EP0036362B1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/784—Arrangements for continuous movement of material wherein the material is moved using a tubular transport line, e.g. screw transport systems
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material

Definitions

  • the present invention relates to a device for the heat treatment of divided materials and in particular of powdered or granular materials.
  • Heat treatment using microwaves (MO) or ultra high frequency waves (UHF) which are between approximately 300 Megahertz and approximately 30 Gigahertz is currently spreading more and more, thanks in particular to the great availability of this energy. , its good propagation in various atmospheres, its good regulation and its satisfactory enslavement.
  • the homogeneous heating throughout the mass of the treated product which it also provides, has enabled numerous applications of this form of energy, both domestic and industrial applications.
  • the object of the present invention is therefore to provide a device which not only makes it possible to keep on the one hand the most satisfactory single-mode waveguide-device with the highest energy density - but also, d on the other hand, to provide a device which makes it possible to continuously advance the material to be treated at a large, constant and adjustable flow rate, while maintaining it in a maximum energy field.
  • One of the aims of the present invention is also to be able to use low power energy sources, produced in large series, therefore economically very advantageous.
  • the subject of the present invention is a device for the continuous heat treatment of divided materials and in particular of powdered or granular materials, by UHF radiation, is characterized in accordance with claim 1.
  • the sheath and the partitions substantially perpendicular to the sheath represent between 1/4 and 1/2 of the total height of the waveguide .
  • the material to be treated would of course be in the maximum field of action, but the useful volume of the treated material would be reduced; if on the other hand the propeller touched the wall of the sheath, that is to say if the fixed partitions disappeared perpendicular to the sheath, the volume of materials treated would be maximum, but also the loss of energy, because the current lines of the wall itself would be cut, the optimum effect being, according to the invention, between 1/4 and 1/2 of the total height of the waveguide.
  • the width of the excitation device or dimension according to the pitch of the propeller exceeds the pitch of the propeller.
  • the thickness of the propeller in particular in the vicinity of the fixed part of the waveguide constituted by the partitions, is calculated in such a way that there is never any communication between two excitation guides.
  • This modality of the invention which precisely allows the use of low-power and very inexpensive commercial magnetrons, makes the device according to the present invention particularly suitable for all heat treatments using large quantities of materials.
  • the thickness of the fixed partitions perpendicular substantially to the sheath is also calculated so that there is no communication between two excitation guides.
  • the device is provided with means for recovering and using the magnetron cooling air to optionally remove water vapor from the treated material.
  • the heat treatment device is pressurized by an inert gas, such as nitrogen for example.
  • the material inlet and outlet openings are square section tubes whose side is at most equal to half the wavelength used for the treatment of the material.
  • the material inlet and outlet openings are tubes of circular section, the diameters of which do not allow the propagation of the wave used for the treatment of the matter.
  • the thickness of the sheath lining which is made of non-polar materials such as polyethylene or polystyrene, and is housed between the partitions, represents 1 / 4 to 1/2 of the total height of the waveguide.
  • the sleeve is formed of two half-sleeves assembled by two flanges.
  • the edge of the propeller which faces the partition is cut in a bevel.
  • the present invention relates more particularly to a new device for the heat treatment of large quantities of divided materials, as well as the overall devices and methods in which the devices according to the present invention are included.
  • this module 7 can measure 600 mm in length. It is provided with two magnetrons 2 and two excitation guides 3 of 70 mm width for example (between two successive magnetrons there are, for example, three propeller pitches 18 of total length of 150 mm) the diameter of the material supply and output tubes is 60 mm for example.
  • the module is particularly suitable for 2.45 GHz microwave (the power of each magnetron is 1 kW).
  • the height 14 of the partitions 9 is 20 mm for example.
  • the material to be treated is located between the turns 10 of the propeller, in the lower part, near the drum axis 13. Knowing the minimum value of the loss factor ⁇ "of the material to be treated, as well as its volume , the number of turns between two sources is determined, so that all the energy emitted by one source is absorbed before the energy from the next source arrives.
  • Figure 3 The mobile part of this waveguide is shown in Figure 3 (Figure 3a is a longitudinal sectional view and Figure 3b is a cross-sectional view).
  • the total height of the propeller plus drum is 440 mm, the propeller alone measuring 120 mm, which gives a fixed part / total height ratio for this exemplary embodiment.
  • this module allow the useful filling of 4.8 I, or 90 kg of material per hour.
  • ten of these modules one in the extension of the other after the removal of the flanges 8, one arrives at a treatment of nearly a ton of materials per hour, for an apparatus the total length of which does not exceed 6 m.
  • the sleeve 6 can advantageously be constituted by two half-sleeves 11, assembled by the flanges 15, to facilitate the mounting of these devices.
  • Figure 4 shows a "section" of the waveguide bounded by the sheath 6, the two fixed partitions 9, the two turns 10, and the surface of the drum axis 13.
  • the material divided during treatment 17 is located in the lower part of the Archimedes screw above the gasket 16 .
  • the thickness 12 of the turns 10 in the vicinity of the partitions 9, is calculated so that there is never any communication between two excitation guides. (It is 15 mm for the non-limiting example described in the above).
  • the edge 19 of the propeller which faces the partition 9 is cut in a bevel.
  • the width, or dimension according to the pitch of the propeller 18, of the excitation device 3 applied against the sheath 6 is such that it exceeds the pitch of the propeller 18, this to avoid the reflection of the wave on the source .
  • the device according to the present invention can, if desired, be pressurized by an inert gas - such as nitrogen for example -. It may also include (not shown in the figures) means for using the cooling air of the magnetrons 2 to remove, if necessary, the water vapor, for example, released from the treated material.
  • an inert gas - such as nitrogen for example -. It may also include (not shown in the figures) means for using the cooling air of the magnetrons 2 to remove, if necessary, the water vapor, for example, released from the treated material.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Powder Metallurgy (AREA)
  • Tunnel Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Claims (11)

1. Vorrichtung zur kontinuierlichen thermischen Behandlung zerteilter Stoffe, und insbesondere pulverförmiger oder körniger Stoffe, durch UHF-Bestrahlung, umfassend einen feststehenden Teil, der mit einer Mehrzahl von Strahlungsquellen (2) versehen ist, und einen beweglichen Teil (19), der von einer Schraube aus leitendem Material, die sich um eine Achse (13) dreht, oder einer archimedischen Schraube gebildet ist, welche den Transport des zu behandelnden zerteilten Stoffs sicherstellt, dadurch gekennzeichnet, daß sie mit Wanderwellen arbeitet und daß der feststehende Teil mit dem beweglichen Teil einen zweiteiligen Wellenleiter bildet, daß der feststehende Teile von einer Hülse (6) aus Metall oder aus einem entsprechen den leitfähigem Material gebildet ist, mit zu der Hülse im wesentlichen senkrechten metallischen Trennwänden (9) versehen ist, und im freien Raum zwischen den Trennwänden einen Einsatz (16) aus nichtpolarem Material enthält, daß die Ganghöhe (18) der Schraube genau dem Abstand entspricht, der zwei aufeinanderfolgende Trennwände (9), mit denen die Hülse (6) versehen ist, trennt, vergrößert um die Dicke (12) der Schraubenwindung (10) der Schraube, daß die Breite des Erregungsleiters (3) oder die Dimension dieses Leiters entlang der Ganghöhe (18) der Schraube diese Ganghöhe (18) der Schraube übersteigt, und daß diese Vorrichtung außerdem folgendes umfaßt: eine Mehrzahl von Magnetrons (2), die an der äßeren Oberfläche der Hülse (6) angebracht sind, wobei der Abstand zwischen zwei aufeinanderfolgenden Magnetrons eine Funktion der Ganghöhe (18) des zu behandelnden Stoffs ist, wobei davon ausgegangen ist, daß alle Energie, die von einer Quelle abgegeben wird, absorbiert ist, bevor die Einspeisung der Energie der nachfolgenden Welle in den unteren Teil der Wellenführung, die mit dem zu behandelnden Stoff beladen ist, erfolgt; zwei Öffnungen, eine für den Eintritt (1) und die andere für den Austritt (4) des Stoffs, wobei diese Öffnungen in der Weise dimensioniert sind, daß die verwendete Welle nicht aus dem Wellenleiter austreten kann.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der feststehende Teil der Wellenführung zwischen 1/4 und 1/2 der Gesamthöhe des Wellenleiters ausmacht.
3. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Dicke (12) der Schraube, insbesondere in der Nähe des feststehenden Teils des Wellenleiters, der von den Trennwänden (9) gebildet ist, in der Weise berechnet ist, daß sich niemals eine Verbindung zwischen zwei Erregungsleitern im oberen, nicht mit zu behandelnden Stoff beladenem Teil ergibt.
4. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Dicke der feststehenden Trennwände (9), die im wesentlichen senkrecht zur Hülse (6) sind, in der Weise berechnet ist, daß sich niemals eine Verbindung zwischen zwei Erregungsleitern im oberen, nicht mit zu behandelndem Stoff beladenem Teil ergibt.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Vorrichtung mit Mitteln zur Wiedergewinnung und Verwendung der Kühlluft der Magnetrons (2) für das eventuelle Evakuieren des Wasserdampfs des behandelten Stoffs (17) versehen ist.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekenzeichnet, daß die Vorrichtung zur thermischen Behandlung durch ein inertes Gas unter Druck gesetzt ist.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Öffnungen für den Eintritt und den Austritt (1, 4) der Stoffe (17) Rohre mit quadratischem Querschnitt sind, deren Seite höchstens gleich der Hälfte der Länge der für die Behandlung des Stoffs benutzten Wellen ist.
8. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Öffnungen zwischen dem Eintritt und dem Austritt der Stoffe Rohre mit kreisförmigem Querschnitt sind, deren Durchmesser nicht die Ausbreitung der für die Behandlung des Stoffs benutzten Wellen ermöglicht.
9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die archimedische Schraube eine Schraube mit veränderbarer Ganghöhe ist.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Hülse aus zwei Halbhülsen (11) ausgebildet ist, die mittels zwei Flanschen (15) zusammengebaut sind.
11. Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß der Rand (19) der Schraube, welcher der Trennwand (9) zugewandt ist, schräg abgeschnitten ist.
EP81400375A 1980-03-13 1981-03-11 Vorrichtung zur thermischen Behandlung pulverförmiger oder körniger Stoffe Expired EP0036362B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400375T ATE8091T1 (de) 1980-03-13 1981-03-11 Vorrichtung zur thermischen behandlung pulverfoermiger oder koerniger stoffe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8005607A FR2478418A1 (fr) 1980-03-13 1980-03-13 Nouveau dispositif pour le traitement thermique de matieres en poudre ou en grains
FR8005607 1980-03-13

Publications (2)

Publication Number Publication Date
EP0036362A1 EP0036362A1 (de) 1981-09-23
EP0036362B1 true EP0036362B1 (de) 1984-06-20

Family

ID=9239626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400375A Expired EP0036362B1 (de) 1980-03-13 1981-03-11 Vorrichtung zur thermischen Behandlung pulverförmiger oder körniger Stoffe

Country Status (9)

Country Link
US (1) US4406937A (de)
EP (1) EP0036362B1 (de)
JP (2) JPS56149796A (de)
AR (1) AR225948A1 (de)
AT (1) ATE8091T1 (de)
BR (1) BR8101462A (de)
CA (1) CA1161907A (de)
DE (1) DE3164268D1 (de)
FR (1) FR2478418A1 (de)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546226A (en) * 1982-04-29 1985-10-08 Entron Technologies, Inc. Method and apparatus for the conveying and radio frequency processing of dielectric materials
JPS58191998A (ja) * 1982-05-06 1983-11-09 動力炉・核燃料開発事業団 環状槽型マイクロ波加熱装置
US4671757A (en) * 1985-06-06 1987-06-09 Beta Raven, Inc. Microwave heating in a pellet mill
US4826575A (en) * 1985-11-18 1989-05-02 Karamian Narbik A Apparatus for production of high-purity water by microwave technology
US4954681A (en) * 1988-05-31 1990-09-04 Kawata Co., Ltd. Drying and crystallizing apparatus for granules, which employs a microwave device
JPH0714795Y2 (ja) * 1991-10-04 1995-04-10 株式会社松井製作所 粉粒体の乾燥装置
DE4136416C2 (de) * 1991-11-05 1994-01-13 Gossler Kg Oscar Vorrichtung zur Mikrowellen-Bestrahlung von Materialien
US5227598A (en) * 1991-12-23 1993-07-13 General Electric Company In place regeneration of adsorbents using microwaves
JP2798856B2 (ja) * 1992-09-16 1998-09-17 動力炉・核燃料開発事業団 連続脱硝装置
NL1006690C2 (nl) * 1997-07-30 1999-02-02 Marinus Minkjan Microgolf productverwerkingsmachine.
EP1410691A4 (de) * 2001-07-20 2005-08-17 American Purification Inc Mikrowellendesorbierer
WO2005003664A1 (en) * 2003-06-20 2005-01-13 Amut Spa DEVICE AND METHOD FOR HEATING AND / OR DRYING PLASTIC MATERIALS
US7498548B2 (en) * 2006-05-02 2009-03-03 Ranger Research, Inc. Microwave heating system and method for removing volatiles from adsorbent materials
RU2329618C1 (ru) * 2007-01-09 2008-07-20 Государственное образовательное учреждение высшего профессионального образования Саратовский государственный технический университет (СГТУ) Лабораторная камера микроволнового нагрева
GB0725308D0 (en) * 2007-12-28 2008-02-06 Holliday R Combined heater and conveyor
KR100977542B1 (ko) * 2008-11-27 2010-08-24 한국전기연구원 동축 도파관 형태의 공진기로 구성되는 마이크로파 반응기 및 그 방법
EP2625482B1 (de) * 2010-10-07 2020-09-30 Milt D. Mathis Mikrowellen-drehrohrofen
FR2965907B1 (fr) 2010-10-08 2014-11-07 Innovation & Dev Company Idco Dispositif de traitement thermique en continu, en particulier de materiaux divises, par rayonnement micro-ondes
CN102065591B (zh) * 2010-11-16 2012-11-14 成都纽曼和瑞微波技术有限公司 一种大功率组合应用的微波回环腔体
JPWO2013018358A1 (ja) * 2011-08-04 2015-03-05 パナソニック株式会社 マイクロ波加熱装置
FR3046518B1 (fr) * 2016-01-06 2021-04-02 Inovfruit Applicateur micro-ondes monomode, dispositif et procede de traitement thermique de produits
FR3136840B1 (fr) 2022-06-17 2024-09-06 Innovation & Dev Company four rotatif à micro-ondes pour le traitement thermique de matériaux divisés

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
FR1471131A (fr) * 1966-03-15 1967-02-24 Elliott Brothers London Ltd Appareil de chauffage à haute fréquence pour traitement thermique
US3549848A (en) * 1969-02-06 1970-12-22 Varian Associates Composite microwave applicator and product conveyor
GB1369677A (en) * 1972-02-25 1974-10-09 Rotax Ltd Apparatus for heating a web of a dielectric material
US3777095A (en) * 1972-05-15 1973-12-04 Tokyo Shibaura Electric Co Microwave heating apparatus
JPS50131140A (de) * 1974-04-03 1975-10-17
US4104205A (en) 1976-01-06 1978-08-01 The Goodyear Tire & Rubber Company Microwave devulcanization of rubber

Also Published As

Publication number Publication date
EP0036362A1 (de) 1981-09-23
ATE8091T1 (de) 1984-07-15
DE3164268D1 (en) 1984-07-26
US4406937A (en) 1983-09-27
CA1161907A (en) 1984-02-07
JPS56149796A (en) 1981-11-19
FR2478418A1 (fr) 1981-09-18
BR8101462A (pt) 1981-09-15
AR225948A1 (es) 1982-05-14
FR2478418B1 (de) 1983-12-09
JPS6271898U (de) 1987-05-08

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