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EP2984431B2 - Procédé de séchage de bois de construction au moyen d'air chaud - Google Patents
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EP2984431B2 - Procédé de séchage de bois de construction au moyen d'air chaud - Google Patents

Procédé de séchage de bois de construction au moyen d'air chaud Download PDF

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Publication number
EP2984431B2
EP2984431B2 EP14782103.7A EP14782103A EP2984431B2 EP 2984431 B2 EP2984431 B2 EP 2984431B2 EP 14782103 A EP14782103 A EP 14782103A EP 2984431 B2 EP2984431 B2 EP 2984431B2
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EP
European Patent Office
Prior art keywords
subprocess
air
heat
subprocesses
drying
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Active
Application number
EP14782103.7A
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German (de)
English (en)
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EP2984431A4 (fr
EP2984431B1 (fr
EP2984431A1 (fr
Inventor
Robert Larsson
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Valutec AB
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Valutec AB
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Application filed by Valutec AB filed Critical Valutec AB
Priority to PL14782103.7T priority Critical patent/PL2984431T5/pl
Publication of EP2984431A1 publication Critical patent/EP2984431A1/fr
Publication of EP2984431A4 publication Critical patent/EP2984431A4/fr
Publication of EP2984431B1 publication Critical patent/EP2984431B1/fr
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Publication of EP2984431B2 publication Critical patent/EP2984431B2/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • 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
    • F26B3/04—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 circulating over or surrounding the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/33—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/35—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B2015/003—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form the load carrying elements having provisions for defining drying gas ducts, e.g. panels
    • 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 goods
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the present invention concerns a method for drying of material in a progressive dryer, in particular timber material collected in stacks, through flushing with a circulating flow of air, the condition of which is caused to adopt wet and dry temperatures that are suitable for the quality of the material through the supply of heat to the circulating flow of air and the withdrawal of moisture from the same by ventilation.
  • Air is used as a drying medium to transfer heat and transport moisture, which air is circulated with a specific temperature, moisture content and rate of flow through the material with the aid of fans.
  • the drying air is heated with the aid of an air-heating arrangement that comprises heating coils.
  • the drying air is caused to pass through the material such that moisture and water evaporate from the material and are absorbed by the drying air.
  • the drying air that is circulated in the drying chamber which air eventually becomes saturated with moisture, to be able to absorb more water from the material, it must be dehumidified, which normally takes place through ventilation, whereby the air is diluted with cold, relatively dry outdoor air - fresh air.
  • WO0225192 A1 , JP2000351103 A and JP2008307790 A disclose different processes for drying timber.
  • the drying in a batch dryer takes place in batches in closed chambers.
  • the dryer is filled with timber and the drying subsequently continues until the complete batch is fully dry.
  • progressive dryers one stack of timber at a time is fed forwards stepwise through the dryer.
  • the drying climate varies in zones along the drying channel.
  • the drying climate varies all the time and the drying process is adapted according to the timber to be dried, the desired final moisture content and the desire final quality.
  • the climate in the drying chamber is controlled through regulation of pre-determined parameters such as, among other things, dry and wet temperatures.
  • the dry temperature is controlled with the aid of regulation of the heat emitted from a heating coil, while the wet temperature is controlled through regulation of the degree of opening of ventilation openings, and possibly also watering or steam-treatment equipment.
  • the difference in temperature between a dry thermometer and a wet thermometer reflects the relative air humidity, whereby a relatively small difference in temperature corresponds to a relatively high air humidity.
  • the rate of this process depends primarily on the temperature and the prevalent psychrometric difference, i.e. the difference between the dry and wet temperatures, the moisture content of the wood and the rate of flow of the air.
  • a heat exchanger is normally used in this case in which the ventilation is carried out in such a manner that the exhaust air (with a higher temperature) that is output from one zone is allowed to transfer part of its enthalpy to the supply air (with a lower temperature) that is input to another zone. It is known to arrange the drying channel of progressive dryers as two drying zones in the form of a preheating zone and a main drying zone, for an efficient use of energy.
  • the heat energy in the exhaust air that is ventilated out from the main dryer is transferred with the aid of heat exchangers to the preheating zone, in which the timber is preheated before it is fed into the main drying zone for a controlled and monitored drying operation.
  • exhaust air that is output from the main dryer can be mixed with fresh air from the surrounding atmosphere and that the resulting mixture can be used as supply air in the preheating zone, with the result that the preheating zone works with colder drying air than the main drying zone.
  • the disadvantage of such a method that has a preheating zone with a moderate drying capacity for sawn timber material is that the risk of drying cracks becomes large, since the initial part of the drying process takes place at a relatively low temperature. A high wet temperature is desirable during this phase of the drying process, when large drying tensions in the timber easily give rise to the formation of cracks, since the wood will in this case become more plastic, and drying tensions may in this way be reduced.
  • thermo tolerant moulds Another complication that can arise during the drying of timber is what is known as “thermo tolerant moulds", which can grow on the timber and form spores during the drying process due to relatively low temperatures in the preheating stage.
  • the mould grows and gives a grey-black discolouration of the timber that in the worst case makes it necessary to discard the timber.
  • thermo tolerant moulds By maintaining a relatively high temperature of approximately 50 °C during the initial phase, which means that the dry temperature of the air will vary between 55 and 70 °C, it is possible to limit the growth conditions for fungi and moulds. A period of a few hours at these high temperatures is sufficient in this part of the process to control this.
  • a first purpose of the present invention is to achieve a method for the drying of material using warm air that makes it possible to make the drying process more efficient not only in batch dryers but also in progressive dryers and in this way to achieve a reduced energy consumption.
  • a second purpose of the invention is to achieve a method for the drying of material using warm air that makes it possible to avoid timber with surface defects, discolourations and mould.
  • a third purpose of the invention is to achieve a progressive dryer that can carry out the drying process with a low energy input and that makes it possible to avoid timber with surface defects and discolourations.
  • One interesting application of the invention is constituted by a timber-drying channel with longitudinal circulation that is divided into two limited drying zones, connected in series, by a door that can be raised and lowered, where the subsequent second zone is regulated at a dry temperature that is lower than the wet temperature in the first zone, and where the heat consumption for the second subprocess is provided by enthalpy, in the form of heat energy from warm, moist air in the first zone, being transferred and delivered to the second zone through a heating coil arranged in the said zone.
  • enthalpy in the form of heat energy from warm, moist air in the first zone, being transferred and delivered to the second zone through a heating coil arranged in the said zone.
  • Figure 1 shows schematically a method according to the invention in a first design where the drying process is divided into two subprocesses A, B and the use of a heat recovery system that transfers heat between the subprocesses through a heat-bearing fluid medium
  • Figure 2 shows schematically a method according to the invention in a second design where the drying process is divided into two subprocesses A, B and a heat recovery system, in which a heat recovery system that transfers heat between the subprocesses by exchanging the different flows of air of the two subprocesses is a component.
  • FIG. 1 shows the present invention in a first design as a schematic arrangement that uses a fluid medium in order to transfer heat between subprocesses.
  • the drying in subprocess B takes place at a dry temperature TtB that is lower than the wet temperature TvA for the drying in subprocess A, i.e. TtB ⁇ TvA.
  • the material 1 to be dried in the subprocesses is flushed in separate zones, each in a separate chamber, by circulating flows 2 of drying air, which flushing is achieved by means of fans 3.
  • the circulating air in subprocess A is heated in conventional manner by a heating coil 5 fed by hot water.
  • the exhaust air 6 from the subprocess B may be led out from the chamber and replaced by fresh supply air 26 that has been obtained from the surrounding atmosphere. No exchange of air normally takes place in subprocess A or, in relevant cases, only a limited such exchange takes place.
  • Subprocess A proceeds essentially according to the principle of condensation whereby water vapour bound in the circulating drying air 2 is cooled and is condensed out in the drying zone by a condensation process.
  • Heat can be transferred between the two subprocesses A, B with the aid of a heat recovery system, through a heat-bearing fluid medium, whereby it should be understood that enthalpy is principally transferred from subprocess A to subprocess B.
  • a condensation heat exchanger 7 arranged in the first subprocess A and a heating coil 8 arranged in subprocess B are components of the system.
  • a closed circuit 9 is arranged to circulate with the aid of a circulation pump (not shown in the drawings) a heat-bearing medium between the condensation heat exchanger 7 in subprocess A and the heating coil 8 in subprocess B.
  • the circuit runs in loops 9a, 9b for the exchange of energy between the circulating drying air in subprocesses A and B, whereby the loop 9a absorbs heat from condensed water vapour in the drying air in subprocess A and transfers this heat through the loop 9b to the heating coil 8 in subprocess B.
  • the heat consumption for subprocess B is in this case provided through the enthalpy that has been obtained from the condensed water vapour in the circulating air from subprocess A.
  • no exchange of air with the surrounding atmosphere takes place at subprocess A.
  • the combination of these two arrangements gives an extremely low consumption of heat for the drying process as a whole and, as a consequence of the relatively high temperature in subprocess A, problems with discolouration and cracks can be avoided.
  • the second drying zone for subprocess B can, when necessary, be equipped with additional power, which may be constituted by a heating coil.
  • FIG. 2 shows the present invention in a second design as a schematic arrangement that transfers heat between subprocesses by exchanging the different flows of air of the processes in a heat exchanger of, for example, countercurrent flow type or cross-heating type.
  • the drying in subprocess B takes place at a dry temperature TtB that is lower than the wet temperature TvA for the drying in subprocess A, i.e. TtB ⁇ TvA.
  • the material 1 to be dried in the subprocesses A, B is flushed by circulating flows 2 of air that are achieved by means of fans 3.
  • the circulating air in subprocess A is heated in conventional manner by a heating coil 5 fed by hot water.
  • the exhaust air 16 from subprocess A is carried to the heat exchanger 14 in subprocess B and is divided after its passage through this heat exchanger into a saturated air flow 17 and a condensation flow 18.
  • the exhaust air 19 from subprocess B is mixed with the saturated air flow 17 at 20 and the mixture is allowed to pass through an external heat exchanger 21, after which the condensate 22 is separated and the saturated air flow 23 is divided into a subflow 24, which is expelled from the facility, and a subflow 25, which is used as supply air for subprocess A with a high wet temperature.
  • the supply air 26 to the subprocess B with low wet temperature is preheated in the heat exchanger 21.
  • the consumption of heat for subprocess B is supplied fully or partially through the enthalpy in the exhaust air 16 from subprocess A and no separate external supply air (fresh cold air from the surrounding atmosphere) needs to be obtained for subprocess A.
  • the combination of these two arrangements gives an extremely low consumption of heat for the overall process.
  • the second drying zone for subprocess B can, when necessary, be equipped with additional power, which may be constituted by a heating coil.
  • zone 1 is regulated at a high wet temperature, such as 50 °C
  • zone II is regulated at a low wet temperature, such as 20 °C.
  • Zone II has been designed as a channel in which circulating air flows through the timber as a countercurrent flow against the direction of transport of the timber, and as concurrent flow in the first zone I.
  • the circulating air in zone I is heated in conventional manner in heating coils 5.
  • the drying air in zone I is dehumidified by passing through a condensation heat exchanger 7 located in the circulation flow in zone I, where the condensate that is formed emits heat to a heat-bearing fluid medium that passes through the condensation heat exchanger.
  • the heat that is emitted in zone I is transferred through a fluid medium to the heating coil 8 in zone II. Since the drying process in subprocess B takes place at a dry temperature TtB that is lower than the wet temperature TvA of the drying process in subprocess A, i.e. TtB ⁇ TvA, no extra heat supply from an external source is necessarily needed in zone II.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Claims (8)

  1. Procédé de séchage de bois en utilisant de l'air chaud dans un séchoir progressif, le processus de séchage étant divisé en au moins un premier et un deuxième sous-processus (A, B) chacun dans une chambre disposée en série les uns avec les autres ; le bois étant autorisé à passer du premier au deuxième sous-processus ; l'air en circulation (2) des deux sous-processus dans la chambre de séchage concernée étant conditionné à des températures humides (TvA) et (TvB) différentes ; et aucun échange avec l'atmosphère environnante n'ayant lieu dans le premier sous-processus (A) ; caractérisé en ce que le deuxième sous-processus (B) est directement consécutif au premier sous-processus (A) ;
    l'air en circulation (2) dans le premier sous-processus (A) reçoit une température humide (TvA) supérieure à celle de l'air en circulation (2) dans le deuxième sous-processus (B) ;
    le deuxième sous-processus (B) reçoit une température sèche (TtB) inférieure à la température humide (TvA) dans le premier sous-processus (A) ;
    et la chaleur dans l'air en circulation (2) dans le premier sous-processus (A) est récupérée et transférée dans le deuxième sous-processus (B).
  2. Procédé selon la revendication 1, dans lequel la chaleur dans l'air en circulation (2) dans le premier sous-processus (A) est récupérée et transférée dans le deuxième sous-processus (B) par le biais de l'air en circulation (2) dans les deux sous-processus (A, B) en échangeant de la chaleur l'un avec l'autre.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, dans lequel l'air en circulation (2) dans le premier sous-processus (A) est déshumidifié par la vapeur d'eau liée à l'air en circulation refroidie et amenée à se condenser dans la chambre de séchage du premier sous-processus (A).
  4. Procédé selon la revendication 3, dans lequel la chambre de séchage du premier sous-processus (A) est équipée d'un échangeur de chaleur à condensation (7) avec lequel l'air en circulation (2) dans le premier sous-processus (A) peut être amené à se condenser, la chambre de séchage du deuxième sous-processus (B) étant équipée d'un serpentin de chauffage (8) avec lequel l'air en circulation (2) dans la chambre de séchage du deuxième sous-processus (B) peut être chauffé, et qu'un milieu caloporteur est amené à circuler entre l'échangeur de chaleur à condensation (7) dans le premier sous-processus (A) et le serpentin de chauffage (8) dans le deuxième sous-processus (B).
  5. Procédé selon la revendication 1, dans lequel la chaleur dans l'air en circulation (2) dans les deux sous-processus (A, B) est récupérée et transférée par les flux d'air d'échappement des deux sous-processus mélangés (20) l'un à l'autre et amenés à passer à travers un échangeur de chaleur (21) commun aux processus de préchauffage de l'air d'alimentation (26) dans le deuxième sous-processus (B) et, après passage dans l'échangeur de chaleur (21), pour constituer de l'air d'alimentation pour le premier sous-processus (A).
  6. Procédé selon la revendication 4, dans lequel la chaleur est transférée entre les deux sous-processus (A, B) par l'utilisation d'un échangeur de chaleur (14, 21), par exemple du type à flux à contre-courant ou du type à chauffage croisé, afin d'échanger les flux d'air comprenant l'air entrant et l'air sortant (25, 26; 16, 19) entre les sous-processus.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel on utilise un système de récupération de chaleur qui ne transfère que la chaleur du premier sous-processus (A) au deuxième sous-processus (B) à travers un milieu caloporteur, par exemple, d'un fluide dans lequel l'air en circulation (2) dans le premier sous-processus (A) est déshumidifié par la vapeur d'eau liée à l'air en circulation refroidi et amenée à se condenser dans la chambre de séchage du sous-processus (A), mais aussi un système de récupération de chaleur qui transfère la chaleur du premier sous-processus (A) au deuxième sous-processus (B) en échangeant les différents flux d'air des deux sous-processus comprenant l'air fourni et l'air d'échappement (25, 26; 16, 19) entre les sous-processus.
  8. Procédé selon la revendication 7, dans lequel la chaleur dans l'air en circulation dans les deux sous-processus (A, B) est récupérée et transférée par les flux d'air d'échappement des deux sous-processus mélangés (20) l'un à l'autre et amenés à passer à travers un échangeur de chaleur (21) commun aux processus pour le préchauffage de l'air d'alimentation (26) dans le deuxième sous-processus (B) et, après passage dans l'échangeur de chaleur (21), pour constituer de l'air d'alimentation pour le premier sous-processus (A).
EP14782103.7A 2013-04-08 2014-04-03 Procédé de séchage de bois de construction au moyen d'air chaud Active EP2984431B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14782103.7T PL2984431T5 (pl) 2013-04-08 2014-04-03 Sposób suszenia drewna za pomocą ciepłego powietrza

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1350429A SE537903C2 (sv) 2013-04-08 2013-04-08 Förfarande för torkning av trävirke med varmluft och en kanaltork
PCT/SE2014/050409 WO2014168559A1 (fr) 2013-04-08 2014-04-03 Procédé de séchage de bois de construction au moyen d'air chaud

Publications (4)

Publication Number Publication Date
EP2984431A1 EP2984431A1 (fr) 2016-02-17
EP2984431A4 EP2984431A4 (fr) 2016-11-16
EP2984431B1 EP2984431B1 (fr) 2019-10-16
EP2984431B2 true EP2984431B2 (fr) 2025-02-19

Family

ID=51689841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14782103.7A Active EP2984431B2 (fr) 2013-04-08 2014-04-03 Procédé de séchage de bois de construction au moyen d'air chaud

Country Status (5)

Country Link
EP (1) EP2984431B2 (fr)
FI (1) FI2984431T4 (fr)
PL (1) PL2984431T5 (fr)
SE (1) SE537903C2 (fr)
WO (1) WO2014168559A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017108699B4 (de) 2017-04-24 2024-09-26 Stela Laxhuber Gmbh Durchlauftrockner mit einem Wärmeübertrager
DE102017108697B4 (de) 2017-04-24 2024-12-05 Stela Laxhuber Gmbh Durchlauftrockner mit einer Abluftrückführeinrichtung
DK3717851T3 (da) * 2017-11-28 2022-05-30 Etex Building Performance Int Sas Fremgangsmåde og anordning til tørring af plader
EP3667218B1 (fr) * 2018-12-12 2021-06-09 Valutec AB Procédé de séchage du bois

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE429785B (sv) * 1978-10-13 1983-09-26 Svenska Traeforskningsinst Forfarande for torkning med varmluft
SE449788B (sv) * 1982-04-28 1987-05-18 Flaekt Ab Torkanleggning for skivformiga material
FI78348C (fi) * 1983-11-15 1989-07-10 Tekma Oy Foerfarande foer reglering av funktionen av genomkoerbar kammartork foer traevirke.
DE4326877C1 (de) 1993-08-11 1994-10-13 Babcock Bsh Ag Verfahren zum Trocknen von Platten und Trockner
SE505655C2 (sv) * 1994-02-11 1997-09-29 Flaekt Ab Förfarande för torkning av virke
JP3256196B2 (ja) * 1999-06-11 2002-02-12 エノ産業株式会社 木材乾燥方法及び装置
WO2002025192A1 (fr) * 2000-09-25 2002-03-28 Windsor Engineering Group Limited Four de sechage de bois d'oeuvre
AT503896B1 (de) 2006-06-21 2008-10-15 Andritz Tech & Asset Man Gmbh Verfahren und anlage zur verarbeitung von feuchtgut
JP2008307790A (ja) 2007-06-14 2008-12-25 Kyushu Univ 木材乾燥方法
JP2009241265A (ja) * 2008-03-28 2009-10-22 Sumitomo Forestry Co Ltd ヒノキ材の乾燥方法
US8397400B2 (en) 2010-05-25 2013-03-19 Forest Research Institute Malaysia High temperature lumber treatment system
AT510487B1 (de) 2010-10-07 2012-09-15 Mci Man Ct Innsbruck Internationale Hochschule Gmbh Trocknungsverfahren und trocknungssystem

Also Published As

Publication number Publication date
EP2984431A4 (fr) 2016-11-16
EP2984431B1 (fr) 2019-10-16
SE1350429A1 (sv) 2014-10-09
PL2984431T5 (pl) 2025-07-21
PL2984431T3 (pl) 2020-04-30
SE537903C2 (sv) 2015-11-17
WO2014168559A1 (fr) 2014-10-16
EP2984431A1 (fr) 2016-02-17
FI2984431T4 (sv) 2025-05-22

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