EP1248059A1 - Verfahren zur Trocknung von Schnittholz und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Trocknung von Schnittholz und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP1248059A1
EP1248059A1 EP02075762A EP02075762A EP1248059A1 EP 1248059 A1 EP1248059 A1 EP 1248059A1 EP 02075762 A EP02075762 A EP 02075762A EP 02075762 A EP02075762 A EP 02075762A EP 1248059 A1 EP1248059 A1 EP 1248059A1
Authority
EP
European Patent Office
Prior art keywords
enclosure
wood
pressure
air
saturated water
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.)
Withdrawn
Application number
EP02075762A
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English (en)
French (fr)
Inventor
Abdelaâziz BOUIRDENE
Bernard Dedieu
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.)
Valeurs Bois Industrie
Original Assignee
Valeurs Bois Industrie
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 Valeurs Bois Industrie filed Critical Valeurs Bois Industrie
Publication of EP1248059A1 publication Critical patent/EP1248059A1/de
Withdrawn legal-status Critical Current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
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a method of drying wood from sawing or wooden objects.
  • sawing wood is meant a wood which comes from directly from the first transformation (sawing).
  • L ANTTI teaches to dry wood with microwaves operating in frequencies of 915 or 2450 MHz and a power density in the range of 25 to 78 kW / m 3 to raise the interior temperature of the wood to approximately 140 ° C and achieve an internal vapor pressure 25 KPa wood.
  • the internal pressure thus produced is very high to allow very rapid evacuation of the water.
  • the disadvantage of the process is that it develops fiber breaks.
  • the drying process begins with rapid microwave drying at around 70 ° C, then intermittent microwave exposure during drying, and finally a drying operation by controlling the temperature of the wood below saturation. fibers, limited to a maximum temperature of 110 ° C.
  • the object of the present invention is to propose a method which optimizes the energy and reduces the powers of the microwave while very quickly obtaining a complete drying of the wood, from the green state to a final humidity level of around 10%, or even lower depending on the conditions of implementation.
  • liquid exudates are evacuated in permanently.
  • the exudates are evacuated by intermittently.
  • the evacuation step is followed by a step of gradually decreasing the pressure to the pressure atmospheric after microwave shutdown.
  • the evacuation step comprises a physico-chemical treatment step of the exudates to make them compatible with discharge to the wastewater circuit.
  • the stage of evacuation of exudates liquids is followed by a recovery step in a container with a view to chemical reprocessing.
  • the step of reducing the pressure is supplemented by a dehumidification step of the ambient air of the enclosure by passage of the air flow coming from the enclosure over an absorption device humidity and cooling of the enclosure air.
  • the microwave emission powers applied are decreasing from the center of the pieces of wood towards outside.
  • the saturated water vapor pressure is between 2 bars and 15 bars.
  • the vapor pressure will be less than 10 bars to obtain a humidity level of the treated wood greater than 6%.
  • the vapor pressure will be understood for at least a determined drying time between 10 and 15 bars and the temperature produced will reach a value within a range of 200 to 220 ° C to obtain a naturally polymerized dry wood with a humidity level close to 0%.
  • the power of the microwave generator is calculated so that the internal heat of the wood is greater than the saturated water vapor temperature.
  • Another object of the invention is to propose a device allowing the implementation of the process.
  • the device consists of a waterproof pressure-resistant enclosure communicating through quartz or any other material suitable for microwaves with a guide wave connected by impedance adapters to a microwave generator, said windows being arranged transversely to the stack of wood, the enclosure communicating with a pressurized air recirculation path sucking air from one side of the wood stack through grates and pushing it out the other side of the wood stack by diffusion grids, a device pressurized steam generator connected to the enclosure.
  • the device comprises a circuit steam condenser connected, in parallel on the recirculation circuit air and selectively by valves.
  • the device comprises in its part the lower an outlet for gravity drainage of runoff water controlled by a valve.
  • the entire enclosure and the area of preloading are wrapped in a second enclosure of protection against radiation leaks, this enclosure being accessible from the outside by flexible doors.
  • the microwave generator is buried into the ground and communicates with the drying chamber through a guide wave.
  • the enclosure comprises a valve security.
  • the valve is opened intermittently.
  • the valve is permanently open.
  • the orifice is connected to a device for physico-chemical treatment making the exudates compatible with sewage disposal standards.
  • the processing of a pine essence provides an exudate with insecticidal properties.
  • the device consists of a enclosure (1), preferably cylindrical, of metallic material ensuring on the one hand, both good thermal insulation and watertightness air pressure and secondly, sealing against waves.
  • This enclosure is open at one end by a door (16, Figure 1B) or two.
  • the openings (14) are made in the enclosure to constitute windows made of airtight material but allowing microwave radiation to pass through.
  • These windows (14) under pressure are made of material allowing to emit the waves towards the interior of the enclosure and say emitting windows.
  • the waves are brought by a waveguide (40) to a plurality of windows arranged longitudinally and on each side at intervals regular or not along the stack of wood (3) to obtain a distribution the the most homogeneous waves possible.
  • the waveguide (40) communicates to through an impedance adapter (41) and a 3-decibel divider (42). with an isolator (43) and the microwave generator (44). Between each window (14) emitting or between the emitting windows of the ends and each enclosure bottom, are preferably arranged a plurality of pipes (12) of forced air circulation by a fan V. These pipes (12) communicate over a height corresponding approximately to that of the stack of wood through grids (13) with the internal area of the enclosure containing the stack of wood (3) transported on a conveyor means such as, for example, a carriage consisting of wheels (32) mounted on a tray support (31).
  • a conveyor means such as, for example, a carriage consisting of wheels (32) mounted on a tray support (31).
  • the wood stack is preferably made of pieces (30) in the form of beams or planks or planks of thickness and width any, from sawing and arranged contiguously across their width in a longitudinal direction to form a layer.
  • Each layer of wood is spaced from the bottom layer by battens or rods (33) arranged perpendicularly in a non-contiguous manner to spare between the adjoining layers of pieces of wood in the circulation passages of air, waves, and water.
  • the air circulation circuit is also made in material favoring the reflection of waves towards the interior of the enclosure and the wood.
  • the enclosure is placed in communication by a pipe (15) with a steam generator system (2) and possibly a compressor air (20).
  • the air compressor (20) is used to produce compressed air intended to accelerate the water circulation in the wood and, when the steam generator system (2) cannot generate steam under sufficient pressure to rise at the desired temperature or to support the rise in temperature and accelerate the water circulation of the wood. However, when using a pressurized steam generator system sufficient to reach temperatures and pressures desired, the air compressor can be deleted.
  • the wheels of the carriage rest on rails (10A, 10B) which are integral from the bottom of the tank (1) these are provided with a device for eliminating electric arcs.
  • a grid (19) prevents the propagation of waves to liquid exudates or runoff collected in the bottom of tank.
  • This runoff is discharged through a pipe (18) controlled by a valve (17).
  • This pipe (18) opens into a removable or drainable container for recovering liquid exudates resulting from the drying process.
  • the pipeline is open continuously or intermittently.
  • the pipeline leads into a physico-chemical treatment device making the exudates compatible with the standards in force for waters waste.
  • the upper part of the tank has a safety (11) which makes it possible to maintain the tank at the desired pressure, relieve pressure if it is too high and finally put the tank to the atmosphere after the drying process is complete.
  • the tank (1) is enclosed in an enclosure (5), which communicates through the airlock of the door (16) automatically controlled at the end and at the start by a system electronic control.
  • a preloading area (50) makes it possible to bring the carriages on a pair of rails (10C, 10D) which are not related electric with the rails (10A, 10B) of the enclosure (1).
  • a device for spraying (52) allows water to be sprayed during the use phase microwaves to prevent radiation from leaking out.
  • a reserve tank not shown, removable and drainable is connected to the enclosure (1) by a pipe (18) and makes it possible to collect the exudates liquids resulting from the drying of wood. To ensure reduced leakage the microwave generator (44) is buried like the reserve tank (6) and communicates with the drying chamber (1) through the waveguide (40).
  • the drying process includes the following operations: introduction by means of transfer of a load of green wood into the enclosure; automatic closing of the enclosure door, this preferably to avoid all errors and shocks due to handling; pressurization of the enclosure and diffusion of saturated vapor in the enclosure until the pressure corresponding to the temperature of desired operation in saturated steam.
  • We can, if the need arises, rise to temperatures of saturated vapor greater than 180 ° Celsius, 200 ° Celsius, or even 220 ° Celsius by increasing the pressure up to 10 bars or respectively 15 bars.
  • the temperature and pressure increases of the process can be done in successive steps, or according to ramps or again, according to cycles allowing the optimization of the desired result, 0% complete drying, drying to a certain humidity level or production of chemically exploitable liquid exudates.
  • This phase of pre-drying under saturated steam pressure and temperature determined is maintained for the time necessary to pass from one moisture content of green wood at least 65% depending on the species at a so-called "saturation" rate of 30%.
  • saturation rate of 30%
  • the microwave power emitted by the central window (14c) can be higher than the power emitted by the windows (14l) located on either side of the central window, is used so as to obtain a temperature differential in wood which corresponds to a differential of vapor pressure in wood.
  • This pressure differential will be oriented by in order to favor the evacuation of water towards the outside of the wood and in the direction fibers when the determined operating temperature has been reached.
  • the power of microwave generators is calculated so to reach a wood temperature higher than that of saturated vapor which can be close to 120 ° Celsius or higher and produce the effect sought in the context of drying from the inside to the outside of the wood.
  • the siphon (18) is triggered at regular intervals by the control system as soon as the level closer to the grid.
  • the enclosure includes a level detector device allowing the automatic opening of the valve (17).
  • Each cycle water evacuation is followed by a vapor pressure reset cycle saturated water from the enclosure. This last phase brings the wood moisture content of 30% at the desired final rate which can be 20%, 10%, 6% or 0%.
  • the process will include at least one phase of fixed duration during which the temperature will be kept within a range around 200 to 220 ° C and in a vapor atmosphere pressure saturating greater than 10 bars.
  • the drying process can also be used in the device of the invention for producing a liquid exudate incorporating molecules chemicals constituting a wood essence, such as pine, eucalyptus, oak, beech, spruce, etc., or a determined mixture of species.
  • This exudate is recovered and possibly reprocessed by physicochemical processes to obtain exploitable chemical components in the cosmetic industry, in the pharmaceutical industry, in the perfumes, in the food industry, chemistry or the insecticide industry.
  • the exudate obtained has properties insecticides.
  • Valves (191, 192) for communication with the condenser (19) are open to allow the enclosure vapor to condense and lower the temperature of the enclosure. After a while, the microwave generator is also stopped and the pressure decreased to gradually get to atmospheric pressure.
  • any transfer device can be used in place of the rail-mounted cart.
  • devices control and regulation will initiate the phases successive steps of the process in combination with more or less automation less push.
  • the enclosure has a safety valve (11) allowing the enclosure to be vented, either at the end of the process or excess pressure detected by the control system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP02075762A 1997-10-30 1998-10-29 Verfahren zur Trocknung von Schnittholz und Vorrichtung zur Durchführung des Verfahrens Withdrawn EP1248059A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9713641A FR2770441B1 (fr) 1997-10-30 1997-10-30 Procede de sechage des bois de sciage et dispositif permettant la mise en oeuvre du procede
FR9713641 1997-10-30
EP98952814A EP1027567B1 (de) 1997-10-30 1998-10-29 Verfahren zur trocknung von schnittholz und vorrichtung zur durchführung des verfahrens

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP98952814A Division EP1027567B1 (de) 1997-10-30 1998-10-29 Verfahren zur trocknung von schnittholz und vorrichtung zur durchführung des verfahrens

Publications (1)

Publication Number Publication Date
EP1248059A1 true EP1248059A1 (de) 2002-10-09

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ID=9512846

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02075762A Withdrawn EP1248059A1 (de) 1997-10-30 1998-10-29 Verfahren zur Trocknung von Schnittholz und Vorrichtung zur Durchführung des Verfahrens
EP98952814A Expired - Lifetime EP1027567B1 (de) 1997-10-30 1998-10-29 Verfahren zur trocknung von schnittholz und vorrichtung zur durchführung des verfahrens

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP98952814A Expired - Lifetime EP1027567B1 (de) 1997-10-30 1998-10-29 Verfahren zur trocknung von schnittholz und vorrichtung zur durchführung des verfahrens

Country Status (20)

Country Link
US (1) US6473994B1 (de)
EP (2) EP1248059A1 (de)
JP (1) JP4298914B2 (de)
CN (1) CN1135355C (de)
AT (1) ATE223026T1 (de)
BR (1) BR9813163A (de)
CA (1) CA2309307C (de)
CZ (1) CZ297639B6 (de)
DE (1) DE69807516T2 (de)
DK (1) DK1027567T3 (de)
EA (1) EA002725B1 (de)
ES (1) ES2183419T3 (de)
FR (1) FR2770441B1 (de)
HU (1) HU223389B1 (de)
OA (1) OA11408A (de)
PL (1) PL190044B1 (de)
PT (1) PT1027567E (de)
SK (1) SK6402000A3 (de)
TR (1) TR200001192T2 (de)
WO (1) WO1999023429A1 (de)

Cited By (1)

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EP1847791A1 (de) * 2006-04-21 2007-10-24 Bearn Innovation Verfahren zur Trocknung von Schlämmen und Vorrichtung zur Durchführung dieses Verfahrens

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US6675495B2 (en) 1997-10-30 2004-01-13 Valeurs Bois Industrie Method for drying saw timber and device for implementing said method
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AUPR596301A0 (en) * 2001-06-27 2001-07-19 University Of Melbourne, The A method of microwave treatment of wood
JP3562517B2 (ja) * 2001-08-30 2004-09-08 ヤマハ株式会社 楽器およびその製造方法
CN100344929C (zh) * 2003-04-24 2007-10-24 中国林业科学研究院木材工业研究所 木材干燥内应力释放方法及其释放装置
US7246452B1 (en) * 2003-06-20 2007-07-24 Jacques Roy Method for treating preservative-treated wood
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CN101318347B (zh) * 2008-07-01 2010-09-01 合肥溢新微波能科技有限公司 微波能人造板处理机
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CN101806531B (zh) * 2010-04-26 2012-10-24 湖北老巴王生态农业发展有限公司 冷热风两用干燥房
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KR101222469B1 (ko) * 2012-05-23 2013-01-15 이대암 장수하늘소의 대량증식을 위한 인공사료, 및 이를 이용한 사육방법
CN102721265B (zh) * 2012-06-28 2014-10-15 罗泽云 物料干燥方法及其干燥系统
CN103228073A (zh) * 2013-02-10 2013-07-31 中南林业科技大学 一种用于改善木材微波预处理效果的谐振腔
CN103808121B (zh) * 2014-03-05 2015-07-15 龙胜县宏胜木业有限公司 一种椎木烘干工艺
CN103932357B (zh) * 2014-04-17 2016-04-06 福建省农业科学院畜牧兽医研究所 一种牧草加工车间及其加工工艺
KR101664373B1 (ko) * 2015-01-05 2016-10-12 (주) 토모우드 함수율 체크를 이용한 국산 목재 건조 방법
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CN104677067B (zh) * 2015-03-25 2017-06-23 湖州恒远生物化学技术有限公司 一种冷热两用型干燥箱
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CN105459240B (zh) * 2015-11-17 2017-08-08 西北农林科技大学 一种微波真空法降低人造板甲醛释放量的设备
BR102016008739A2 (pt) * 2016-04-19 2017-10-24 Nunes Claristoni Grain drying process
KR101865909B1 (ko) * 2016-06-15 2018-06-08 인태근 초단파를 이용한 목재 건조장치
US10619921B2 (en) 2018-01-29 2020-04-14 Norev Dpk, Llc Dual path kiln and method of operating a dual path kiln to continuously dry lumber
CN109140929A (zh) * 2018-08-31 2019-01-04 安徽联丰制丝有限公司 一种蚕丝生产用烘干设备
CN110900759A (zh) * 2019-12-12 2020-03-24 沈志荣 一种原木锯材的烘干工艺
CN111006460A (zh) * 2019-12-19 2020-04-14 合肥金菱电器有限公司 高效烘干房
CN112556337B (zh) * 2020-12-08 2022-09-20 东北林业大学 一种具有除菌功能的木材干燥机
CN113211580B (zh) * 2021-05-08 2022-07-29 丁宇 一种用于门板生产使用的节能型门板浸泡辅助设备
CN117906371B (zh) * 2024-03-19 2024-06-04 江苏华诺泰生物医药科技有限公司 一种冻干机的进出料机构

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EP1847791A1 (de) * 2006-04-21 2007-10-24 Bearn Innovation Verfahren zur Trocknung von Schlämmen und Vorrichtung zur Durchführung dieses Verfahrens
FR2900224A1 (fr) * 2006-04-21 2007-10-26 Bearn Innovation Bernard Dedie Procede de sechage des boues et dispositif permettant la mise en oeuvre du procede
WO2007122328A1 (fr) * 2006-04-21 2007-11-01 Bearn Innovation - Dedieu Bernard Procédé de séchage des boues et dispositif permettant la mise en oeuvre du procédé
AU2007242682B2 (en) * 2006-04-21 2011-12-22 INNOTHERM-E Technologies Method of drying sludge and device for implementing the method

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FR2770441A1 (fr) 1999-05-07
ES2183419T3 (es) 2003-03-16
OA11408A (fr) 2004-04-20
BR9813163A (pt) 2000-08-22
CN1280662A (zh) 2001-01-17
DE69807516T2 (de) 2003-04-24
PT1027567E (pt) 2003-01-31
CZ297639B6 (cs) 2007-02-21
HU223389B1 (hu) 2004-06-28
DE69807516D1 (de) 2002-10-02
US6473994B1 (en) 2002-11-05
PL190044B1 (pl) 2005-10-31
CZ20001538A3 (cs) 2001-08-15
PL340375A1 (en) 2001-01-29
EA200000472A1 (ru) 2000-10-30
TR200001192T2 (tr) 2001-07-23
HUP0004131A3 (en) 2001-04-28
EP1027567B1 (de) 2002-08-28
CA2309307C (fr) 2007-10-09
ATE223026T1 (de) 2002-09-15
EP1027567A1 (de) 2000-08-16
SK6402000A3 (en) 2000-11-07
CA2309307A1 (fr) 1999-05-14
JP2001521848A (ja) 2001-11-13
FR2770441B1 (fr) 2000-02-11
CN1135355C (zh) 2004-01-21
WO1999023429A1 (fr) 1999-05-14
HUP0004131A2 (en) 2001-03-28
DK1027567T3 (da) 2002-12-30
EA002725B1 (ru) 2002-08-29
JP4298914B2 (ja) 2009-07-22

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