EP1570710A1 - Industriemikrowellenofen zur wärmebehandlung von producten und dabei angewendet verfahren, insbesondere zur tötung von insekten in holz - Google Patents

Industriemikrowellenofen zur wärmebehandlung von producten und dabei angewendet verfahren, insbesondere zur tötung von insekten in holz

Info

Publication number
EP1570710A1
EP1570710A1 EP03782012A EP03782012A EP1570710A1 EP 1570710 A1 EP1570710 A1 EP 1570710A1 EP 03782012 A EP03782012 A EP 03782012A EP 03782012 A EP03782012 A EP 03782012A EP 1570710 A1 EP1570710 A1 EP 1570710A1
Authority
EP
European Patent Office
Prior art keywords
microwave oven
mentioned
wood
products
magnetrons
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
EP03782012A
Other languages
English (en)
French (fr)
Other versions
EP1570710B1 (de
Inventor
Wilfried Lodewijk Alice Pas
Carlo Bernardus Ghislain Groffils
Rudolf Pieter Maria Jan Hoebeek
Pieter Joseph Urbain C. Luypaert
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.)
Hoebeek Naamlooze Vennootschap
Microwave Energy Applications Co "MEAC" NV
Original Assignee
Hoebeek Naamlooze Vennootschap
Microwave Energy Applications Co "MEAC" NV
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 Hoebeek Naamlooze Vennootschap, Microwave Energy Applications Co "MEAC" NV filed Critical Hoebeek Naamlooze Vennootschap
Publication of EP1570710A1 publication Critical patent/EP1570710A1/de
Application granted granted Critical
Publication of EP1570710B1 publication Critical patent/EP1570710B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F26B3/343—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 in combination with convection
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber
    • 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/045—Microwave disinfection, sterilization, destruction of waste...

Definitions

  • Such microwave ovens for the thermal treatment of products on an industrial scale are already known from Dutch patent No. 8103118, whereby the products to be treated are guided through the oven space of the microwave oven on a conveyor belt and whereby these products are heated by microwaves coming from a number of smaller magnetrons situated on the outside of the oven space on the one hand, and by hot-air currents coming from the cooling of the magnetrons on the other hand.
  • microwave ovens Another disadvantage of such known microwave ovens is that, in order to fight insects in wood, whereby it is important for the wood to be exposed to sufficiently high temperatures for a sufficient length of time, relatively much energy is consumed.
  • the present invention aims to remedy the above-mentioned and other disadvantages by providing an industrial microwave oven which makes it possible to thermally treat products in an efficient, economical and uniform manner in order to dry them and/or to fight insects and larvae which might be present in it.
  • the gas flows and the microwaves are guided to the oven space via the same wave guides, they have the same direction when they leave said wave guides, as a result of which the gas flows end up on the products to be treated in places opposite to the antenna radiators which are heated most of all by the microwave oven, so that the gas flows will have a cooling effect in these places, whereas in other places, where the microwaves are less concentrated, they will rather have a heating effect.
  • Figures 1 and 2 represent an industrial microwave oven 1 according to the invention for the thermal treatment of products 2, in this case for the treatment of wooden boards .
  • Both far ends of the wave guides 14-15 are sealed by means of end walls, 21 and 22 respectively.
  • each wave guide 14-15 On each wave guide 14-15, at the height of the top end of the vertical part 16, is provided a duct 23 whose outlet is connected to a lateral opening 24 in the wall of the wave guide 14-15 concerned and in which is provided a magnetron 25 which sticks with its antenna 26 in the wave guide 14-15 and which is fed by a transformer 27 provided in the case 9-10.
  • the microwave oven 1 is provided with means for cooling the magnetrons 25 in the shape of fans 28 erected at the entries of the above-mentioned ducts 23.
  • Each wave guide 14-15 is provided over practically the entire length of the horizontal part 17 with a downward directed outlet 29 which opens in the central case 9 via an opening in the above-mentioned upper wall 20.
  • outlets 29 of the wave guides 14-15 are provided a number of antenna radiators 30 at regular distances from each other which are represented here as dipoles by way of example, but which could just as well be realised in the shape of slotted lines, leaky waves or the like .
  • the working and use of the industrial microwave oven 1 according to the invention is very simple and as follows .
  • the products 2 to be treated are loaded on the conveyor belt 3 and are thus carried under the central case 9.
  • the fans 28 are excited, as a result of which air is drawn in via the openings 12 and filters 13 and blown into the ducts 23 in order to cool the magnetrons 25.
  • the heated cooling air is guided further to the oven space 31 via the wave guides 14-15, where the cooling air, as represented by the arrows P, flows over the products 2 to be treated and is guided outside via the perforations 5 in the conveyor belt.
  • a practical realisation of a microwave oven according to the invention for the treatment of wood, in particular for drying wood and for killing insects and larvae of the ⁇ lictus brunneus' family, is described hereafter by way of example .
  • the temperature T of the product 2 to be treated exceeds a minimal killing temperature TMIN of some 60 °C during a length of time DS of some 280 seconds.
  • the curve of figure 3 shows that this is obtained by shortly heating the product 2 between the point of time A at which it enters the microwave oven 1 and the point of time B at which it leaves the microwave oven 1, such that, when it leaves the microwave oven 1, a temperature TB of at least 70 °C is reached which is considerably higher than the above-mentioned killing temperature.
  • the product 2 gradually cools and reaches the above-mentioned killing temperature TMIN again at the point of time C.
  • the speed of the conveyor belt 3 is adjusted such that the temperature TB of the product 2, when it leaves the microwave oven 1, is sufficiently high for the length of time (C-D) during which the temperature T of the product is higher than TMIN, to be at least equal to the above- mentioned length of time DS which is required to efficiently kill the insects and the larvae.
  • the product 2 is heated during the entire length of time DS, which requires much more energy compared to the method according to the invention whereby the product 2 is only shortly heated.
  • an insecticidal gas can be used to kill the insects and larvae.
  • Another application is the use of nitrogen which can be used for example in case of emergency to extinguish a possible fire in the microwave oven 1.
  • the climate in the actual oven space 31 can be perfectly conditioned, depending on the required application .
  • Figure 4 represents a variant of a microwave oven 1 according to the invention whereby additional fans 28 are in this case placed at the openings 12 of the cases 10-11 which offer the advantage that larger cooling flow rates can be realised which can moreover be guided along the above-mentioned transformers 27 for a better cooling of the latter.
  • the wave guides 14-15 are in this case inserted circulators 32 and/or insulators in the known manner in view of the security which, as is known, are provided with a core on the basis of ferrites.
  • the wave guides 14-15 are situated on the top wall 20 in each other's prolongation, it is not excluded for these wave guides 14 and 15 to be applied crosswise in relation to each other and to preferably extend over the entire or almost the entire width of the top wall 20 in this case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Catching Or Destruction (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
EP03782012A 2002-12-11 2003-12-10 Industriemikrowellenofen zur wärmebehandlung von producten und dabei angewendetes verfahren, insbesondere zur tötung von insekten in holz Expired - Lifetime EP1570710B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE200000722 2002-12-11
BE2002/0722A BE1015246A6 (nl) 2002-12-11 2002-12-11 Industriele microgolfoven voor het thermisch behandelen van producten en werkwijze daarbij toegepast, meer speciaal voor het doden van insecten in hout.
PCT/BE2003/000214 WO2004054324A1 (en) 2002-12-11 2003-12-10 Industrial microwave oven for the thermal treatment of products and method applied thereby in particular for killing insects in wood

Publications (2)

Publication Number Publication Date
EP1570710A1 true EP1570710A1 (de) 2005-09-07
EP1570710B1 EP1570710B1 (de) 2006-05-17

Family

ID=32476777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03782012A Expired - Lifetime EP1570710B1 (de) 2002-12-11 2003-12-10 Industriemikrowellenofen zur wärmebehandlung von producten und dabei angewendetes verfahren, insbesondere zur tötung von insekten in holz

Country Status (10)

Country Link
EP (1) EP1570710B1 (de)
AT (1) ATE326825T1 (de)
AU (1) AU2003289765A1 (de)
BE (1) BE1015246A6 (de)
DE (1) DE60305346T2 (de)
DK (1) DK1570710T3 (de)
ES (1) ES2264777T3 (de)
PT (1) PT1570710E (de)
SI (1) SI1570710T1 (de)
WO (1) WO2004054324A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2928245B1 (fr) * 2008-03-10 2011-01-07 Air Liquide Procede de decongelation de produits alimentaires par micro-ondes
DE102008052289A1 (de) * 2008-10-18 2010-04-22 S- Tech Gmbh Verfahren und Vorrichtung zum Trocknen einer Vielzahl von Holzstücken
EP2186941B1 (de) * 2008-11-17 2011-10-12 Kabushiki-Kaisha Takumi Strukturerhitzungssystem mittels Mikrowelle, Mikrowellenoszillationswellenleitervorrichtung und Mikrowellenoszillatorkühlverfahren
CN103851880A (zh) * 2012-11-30 2014-06-11 北新集团建材股份有限公司 一种微波干燥方法
EP3345455A4 (de) * 2015-09-03 2019-05-15 Commonwealth Scientific and Industrial Research Organisation Mikrowellenerwärmungsvorrichtung und verfahren zum erwärmen
US9726429B1 (en) 2016-01-31 2017-08-08 EPCON Industrial Systems, LP Wood processing oven and method
US10487283B1 (en) 2018-03-20 2019-11-26 EPCON Industrial Systems, LP Regenerative thermal oxidizer with secondary and tertiary heat recovery
EP3784004B1 (de) 2019-08-19 2023-06-07 Meam Cor Bv Mikrowellenapplikatorsteuerung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943500A (en) * 1961-01-30 1963-12-04 Nat Res Dev Improvements in dielectric heating apparatus
FR2147456A5 (de) * 1971-07-28 1973-03-09 Materiel Telephonique
DE4232069A1 (de) * 1992-09-24 1994-03-31 Reinhard Schulze Einrichtung zur Mikrowellenbeaufschlagung, insbesondere zum Trocknen, von Materialien
SE505678C2 (sv) * 1995-04-26 1997-09-29 Cirrus Ab Uppvärmnings- och torkningsanordning
SE517608C2 (sv) * 1999-03-22 2002-06-25 Leif Goesta Zettergren Förfarande för värmebehandling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004054324A1 *

Also Published As

Publication number Publication date
AU2003289765A8 (en) 2004-06-30
AU2003289765A1 (en) 2004-06-30
DE60305346D1 (de) 2006-06-22
DE60305346T2 (de) 2007-04-19
SI1570710T1 (sl) 2006-10-31
ES2264777T3 (es) 2007-01-16
BE1015246A6 (nl) 2004-12-07
PT1570710E (pt) 2006-09-29
EP1570710B1 (de) 2006-05-17
WO2004054324A1 (en) 2004-06-24
DK1570710T3 (da) 2006-08-21
ATE326825T1 (de) 2006-06-15

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