EP1132701A2 - Dispositif de séchage - Google Patents

Dispositif de séchage Download PDF

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Publication number
EP1132701A2
EP1132701A2 EP01000023A EP01000023A EP1132701A2 EP 1132701 A2 EP1132701 A2 EP 1132701A2 EP 01000023 A EP01000023 A EP 01000023A EP 01000023 A EP01000023 A EP 01000023A EP 1132701 A2 EP1132701 A2 EP 1132701A2
Authority
EP
European Patent Office
Prior art keywords
drying
spaces
timber
chamber
space
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Withdrawn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
EP01000023A
Other languages
German (de)
English (en)
Other versions
EP1132701A3 (fr
Inventor
Kalevi Leppäkari
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.)
O-Wood Ltd Oy
Original Assignee
O-Wood Ltd Oy
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 O-Wood Ltd Oy filed Critical O-Wood Ltd Oy
Publication of EP1132701A2 publication Critical patent/EP1132701A2/fr
Publication of EP1132701A3 publication Critical patent/EP1132701A3/fr
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
    • 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
    • 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 drying apparatus for drying wood according to the preamble of claim 1.
  • wood is dried in drying chambers moistened with water vapour where moisture is made to evaporate from the wood to be dried, also known as the load, by subjecting it to heated air, to microwave radiation, or by decreasing air pressure in the drying chamber.
  • Wood is usually inserted into the drying chamber in truck bundles from an openable side wall, or loaded in separate trolleys or on loading pallets and guided into the drying chamber from either end of the chamber.
  • the latter solution for example, requires specific mechanical rail or guide arrangements to be used which disadvantageously increase the total cost of the drying apparatus.
  • the invention is based on the idea that by increasing the temperature of the water contained in the load placed into the drying chamber to over hundred degrees, the water is made to evaporate and a significant, even thousandfold, change in volume takes place.
  • the water vapour the volume of which is thus considerably expanded exits the wood in a pressurized form, improving at the same time the resilience of the wood.
  • the timber dried in the drying apparatus also withstands cracking better.
  • the invention provides significant advantages. By allowing drying air of sufficiently strong flow and high pressure to be provided in the flow spaces, it makes the heating of the drying air significantly more effective. Due to this, the apparatus of the invention allows the drying time to be significantly reduced compared with conventional drying.
  • the efficiently heated drying air allows the drying temperature in the drying chambers to be increased to a sufficiently high level, whereby drying times of even only about a fifth of conventional drying times are achieved, also when the drying is carried out in a low-pressure drying apparatus. Nevertheless, the apparatus produces wood of a highly uniform quality.
  • the timber arranged into the drying chamber of the drying apparatus is oriented to its longitudinal direction and the drying air is arranged to circulate through the longitudinal gaps formed within the timber material, the timber can be arranged into the drying chambers of the drying apparatus of the invention through a hatch on the top of the apparatus.
  • the filling of the drying apparatus is therefore particularly quick and easy, because it can be carried out from the top, without any horizontal battening being needed to improve the drying.
  • the apparatus of the invention is simple in structure and reliable to operate, whereby it is economical to build and to use as well. Its structure also allows most diverse sources of heating to be used for heating the drying air.
  • heat exchangers which comprise tube-like means arranged into the flow space of the drying apparatus for circulating flue gas led from a heating facility, the means allowing economical, solid fuel to be used for heating the drying air.
  • the air is circulated between the heat exchanger tubes using centrifugal rotors as circulating means to provide rapid heating of the drying air.
  • centrifugal rotors being arranged into flow spaces facing each other such that they are connected to the adjacent drying chambers of the drying apparatus, a pressure difference needed for the rapid circulation of the drying air within the timber material can be easily obtained in connection with the flow spaces facing each other.
  • the drying apparatus of the invention preferably utilizes economical, solid fuel in the combustion furnace of the heating facility.
  • the drying can thus be carried out using waste wood, for example, or some other low-cost fuel.
  • a water cushion bordering on the combustion space in the combustion furnace allows the vapour needed in the drying to be most advantageously produced.
  • the preferred embodiment of the drying apparatus 1 and a heating facility 2 shown in the Figures thus comprises two separate parts.
  • the drying apparatus comprises a structure which is preferably in the form of a rectangular prism comprising a bottom 3, side walls 4 and 5 and end walls 6 and 7 as well as an openable hatch 9 mainly serving as a cover 8 of the apparatus in the position of use shown in the Figures.
  • These elements enclose a drying chamber comprising at least two separate drying spaces 11 and 12 separated by a partition walls 10.
  • Timber 13 can thus be lowered into the drying chamber from the top in bundles, the timber being arranged into the drying spaces of the drying chamber substantially parallel with the longitudinal axis of the chamber from one end wall to another.
  • the drying spaces are filled both with round timber and sawn timber, and, as shown in the Figures, with no horizontal battening arranged between the horizontal layers of timber to improve the drying.
  • the circulation of air in the drying chamber is arranged using circulating means 16 and 17 included in the apparatus by providing a pressure difference between the different ends of the timber, the magnitude of the pressure difference determining the flow rate of the drying air.
  • the direction of flow provided by the circulating means can be reversed easily, either with guiding plates provided in the drying chamber or even by changing the circulating means from being connected to one drying space to be connected to the other.
  • the hot air circulating in the drying chamber is in turn generated using for example heat exchangers 18 and 19 arranged at both ends of the drying apparatus.
  • the heat exchangers are arranged in separate flow spaces 20 and 21 connected to the drying chambers in the apparatus.
  • the flow spaces are arranged at ends 6 and 7 of the drying chamber where partition walls 22 and 23 separate them from the drying spaces. Through flow openings in the partition walls, the flow spaces are connected to both drying spaces at the same time to circulate hot air in both drying spaces.
  • Each drying space is provided with at least one circulating means 16 or 17 which is arranged to provide both a turbulent air flow and the pressure difference between the flow openings in the flow space.
  • the strongly flowing air is thereby efficiently heated as it flows between the preferably tube-like heat exchanger elements 18 and 19.
  • the circulating means thus causes an excess pressure at one of the flow openings of the flow space, the excess pressure forcing the heated air from the flow opening into the drying space where it continues, still by the impact of pressure, between the timber material in the flow space towards the flow opening of the flow space at the other end of the drying apparatus, assisted by the negative pressure prevailing at its vicinity.
  • the air is heated again and its pressure increased, whereby the air moves into the second, adjacent flow space and flows between the timber material in the space back to the first flow space. This circulating of the drying air continues until the desired moisture content of the timber is obtained.
  • the circulating means 16 and 17 of the described drying apparatus 1 are preferably implemented using centrifugal propellers.
  • the heat exchanger 18 or 19 is arranged around a conventional centrifugal propeller known per se to replace a propeller frame, the drying air being forced to circulate between the heat exchanger elements to heat the air.
  • the heat exchanger in question comprises for example electric resistors or a set of tubes, as in the present embodiment, for supplying a hot medium into the flow space.
  • flue gas is led into the heat exchangers from the heating facility 2 arranged in connection with the drying apparatus.
  • a duct 24 connecting the heating facility to a supply opening 25 at the other end wall 6, the flue gases being led from the opening to flue gas conduits 26 and 27 arranged on the other side wall 5 of the drying apparatus, the conduits being preferably arranged to run substantially longitudinally along to the top and bottom edges of the side walls of the drying apparatus.
  • the flue gas conduits are preferably connected to each other through the heat exchanger tubes.
  • the heating facility 2 of the preferred embodiment disclosed is also used to employ waste heat to produce water vapour 29 which is led to the duct 24 between the heating facility and the drying apparatus 1 and further to an upper flue gas conduit 26 for superheating.
  • the water vapour is led into the drying spaces 11 or 12 in at least one steam pipe 30 arranged in the duct and the flue gas conduit, the steam pipes being arranged to supply the superheated water vapour into the air flow prevailing in the drying spaces as the air flows from the flow space 20 or 21 into the drying space.
  • the heating facility 2 comprises a combustion furnace 31 utilizing solid fuel, such as waste wood.
  • the combustion furnace in question comprises an outer housing 32 and, inside the housing, a combustion space 34 enclosed by fire walls 33. Combustion air is arranged to be led through the fire walls by means of a blower 35 arranged on the outer housing of the combustion space.
  • a prior art arrangement known per se such as a screw compressor 37, is then used to supply wood cuttings and waste wood, for example, to the bottom 36 of the combustion space for burning.
  • the purpose of the described combustion furnace is to produce hot flue gases as efficiently as possible for use in the drying apparatus 1.
  • a water cushion cover 38 is provided on its upper part which serves at the same for producing the water vapour 29 to be led into the drying apparatus.
  • the duct 24 used for leading the flue gases into the drying apparatus comprises an inner lining consisting of a tube 30 with a double envelope. The water vapour generated in the water cushion is then led between the tube envelopes into the drying facility, whereby the steam is superheated as it travels in the duct, protecting at the same time the duct structures from excessive heating.
  • the drying apparatus in question functions as follows.
  • the drying chamber divided into two drying spaces 11 and 12 with the partition wall 10 is filled with timber 13 through the hatch 9 on the top surface of the apparatus. Since the timber is dried in its longitudinal direction, no horizontal battening needs to be arranged between the timber material, but the timber is dried by air flowing through longitudinal gaps 14 or 15 appearing in the stacked timber or made there, the flow being particularly efficient when round timber is being dried.
  • the air is made to circulate in the longitudinal direction of the timber, i.e. horizontally, in the drying spaces by means of the centrifugal rotors 16 and 17 arranged at the end walls 6 and 7 of the drying chamber.
  • the partition walls 22 and 23 separate the rotors from the drying spaces but there is a connection between them through separate flow openings.
  • the suction device 28 arranged in the drying apparatus 1 leads the flue gas generated through the duct 24 into the upper flue gas conduit 26 at the side wall 5 of the drying apparatus.
  • the flue gases then continue into the heat exchanger tubes 18 and 19 at the end walls and thereby heat the air in the flow space 20 and 21.
  • both flow spaces are provided with the centrifugal rotor 16 or 17 which causes a strong turbulent and pressurized mass of air. This vibrantly moving mass of air hits the heat exchange tubes whereby it is effectively heated.
  • the pressurized heated air is arranged to flow through the flow opening into the drying space and between the timber material therein, whereby it increases the temperature in the space rapidly and strongly. Since both ends of the drying apparatus are provided with centrifugal rotors, they are arranged at opposite ends of adjacent drying spaces. The air sucked by the centrifugal rotor 16 from the first drying space 11 is heated and pressurized whereby it moves through the flow opening at the end of the second drying space 12 into the drying space under excessive pressure.
  • this drying space is in turn provided with the second centrifugal rotor 17 which causes a negative pressure at the other end of the timber 13 to be dried in the drying space, which in turn produces a strong circulation of heated air between the timber material, the air being arranged to make the moisture in the timber to evaporate.
  • the heated air then moves through the centrifugal rotor 17 and the flow space 21 surrounding it at the end of the drying space back to the end of the first drying space 11 whereby it is again heated and under excessive pressure.
  • This circulation of air continues in the apparatus at a rate of about one round in two seconds.
  • superheated water vapour 29 is led into the drying spaces of the drying apparatus in the steam ducts 30 from the water cushion cover 38 of the combustion furnace 31.
  • the suction device 28 arranged in connection with the flue gas conduits prevents the flue gases from entering the drying chamber and having any impact on the properties of the wood.
  • the apparatus of the invention is therefore most efficiently utilized not only for the drying but also for the heat treatment of wood.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
EP01000023A 2000-02-25 2001-02-20 Dispositif de séchage Withdrawn EP1132701A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20000082U FI4462U1 (fi) 2000-02-25 2000-02-25 Kuivauslaite
FI20000082U 2000-02-25

Publications (2)

Publication Number Publication Date
EP1132701A2 true EP1132701A2 (fr) 2001-09-12
EP1132701A3 EP1132701A3 (fr) 2003-04-02

Family

ID=8557083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01000023A Withdrawn EP1132701A3 (fr) 2000-02-25 2001-02-20 Dispositif de séchage

Country Status (2)

Country Link
EP (1) EP1132701A3 (fr)
FI (1) FI4462U1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854831A1 (fr) * 2003-05-15 2004-11-19 Gie Le Bois Pyrogene Four destine au traitement du bois a haute temperature, et installation et procede pour sa mise en oeuvre
FR2896033A1 (fr) * 2006-01-10 2007-07-13 Bio 3D Applic Soc Par Actions Systeme et procede de sechage de bois.
EP2037198A2 (fr) * 2007-09-14 2009-03-18 Maschinen- und Stahlbau, Julius Lippert GmbH & Co. KG Installation de séchage d'une multitude de moules en plâtre de préférence en plusieurs parties
US7963048B2 (en) * 2005-05-23 2011-06-21 Pollard Levi A Dual path kiln
US8201501B2 (en) 2009-09-04 2012-06-19 Tinsley Douglas M Dual path kiln improvement
CN103162524A (zh) * 2013-03-26 2013-06-19 李玉斌 一种烤烟房用供热炉
CN103245183A (zh) * 2013-04-26 2013-08-14 贵州航天特种车有限责任公司 一种高效节能烘烤装置
CN104522150A (zh) * 2014-11-29 2015-04-22 德清县鑫宝蔬果专业合作社 家用干豆角加工装置
ITUB20160210A1 (it) * 2016-01-18 2017-07-18 Fava S P A Stazione di essicazione della pasta del tipo saliscendi, in particolare lasagne, nidi o formati di pasta corta, con ventilazione perfezionata.
CN105928332B (zh) * 2016-05-05 2018-06-29 贵州绿太阳制药有限公司 一种菊花集中供热负压式干燥杀青系统
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
CN113251754A (zh) * 2021-04-01 2021-08-13 江苏双聚智能装备制造有限公司 一种涂装生产线热能循环系统
CN113865287A (zh) * 2021-10-11 2021-12-31 湖南省南北特食品有限公司 一种高效率的豆干烘干设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106931734A (zh) * 2017-04-20 2017-07-07 眉山市民威林产制品有限公司 一种节省能耗的蚊香烘干装置及方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB381304A (en) * 1931-09-07 1932-10-06 Hanns Loesche An improved process and arrangement for drying wood and other structural materials
GB427021A (en) * 1933-10-06 1935-04-08 Stanley Cochran Smith Improved method of and means for drying boards or sheets made of various materials
US2446147A (en) * 1947-04-23 1948-07-27 Ernest E Walund Wooden lath processing apparatus
GB741881A (en) * 1952-10-03 1955-12-14 Hermann Geul Improvements in or relating to drying kilns for horizontally piled goods
US2756513A (en) * 1952-08-27 1956-07-31 Dixon Charles Edwin Process for the drying of timber or other materials
DE960258C (de) * 1949-12-18 1957-03-21 Gg Kiefer Maschf Holztrockner fuer unmittelbare Feuerung
GB865108A (en) * 1959-06-19 1961-04-12 Manresa Associates Inc Process of the treatment of lumber
US3070896A (en) * 1958-09-24 1963-01-01 St Regis Paper Co Wood drying method
DE2828247A1 (de) * 1978-06-28 1980-01-03 Rolf Pfisterer Durchlauf-trockenofen fuer holz
WO1987002430A1 (fr) * 1985-10-09 1987-04-23 Sten Olof Zeilon Appareil de sechage
WO1995022035A1 (fr) * 1994-02-11 1995-08-17 ABB Fläkt AB Procede et systeme pour secher du bois
DE29611521U1 (de) * 1996-07-02 1996-09-12 Kronseder Josef Vorrichtung zum Trocknen von Holz
US5758434A (en) * 1996-11-12 1998-06-02 Georgia-Pacific Corporation Wood drying system

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB381304A (en) * 1931-09-07 1932-10-06 Hanns Loesche An improved process and arrangement for drying wood and other structural materials
GB427021A (en) * 1933-10-06 1935-04-08 Stanley Cochran Smith Improved method of and means for drying boards or sheets made of various materials
US2446147A (en) * 1947-04-23 1948-07-27 Ernest E Walund Wooden lath processing apparatus
DE960258C (de) * 1949-12-18 1957-03-21 Gg Kiefer Maschf Holztrockner fuer unmittelbare Feuerung
US2756513A (en) * 1952-08-27 1956-07-31 Dixon Charles Edwin Process for the drying of timber or other materials
GB741881A (en) * 1952-10-03 1955-12-14 Hermann Geul Improvements in or relating to drying kilns for horizontally piled goods
US3070896A (en) * 1958-09-24 1963-01-01 St Regis Paper Co Wood drying method
GB865108A (en) * 1959-06-19 1961-04-12 Manresa Associates Inc Process of the treatment of lumber
DE2828247A1 (de) * 1978-06-28 1980-01-03 Rolf Pfisterer Durchlauf-trockenofen fuer holz
WO1987002430A1 (fr) * 1985-10-09 1987-04-23 Sten Olof Zeilon Appareil de sechage
WO1995022035A1 (fr) * 1994-02-11 1995-08-17 ABB Fläkt AB Procede et systeme pour secher du bois
DE29611521U1 (de) * 1996-07-02 1996-09-12 Kronseder Josef Vorrichtung zum Trocknen von Holz
US5758434A (en) * 1996-11-12 1998-06-02 Georgia-Pacific Corporation Wood drying system

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854831A1 (fr) * 2003-05-15 2004-11-19 Gie Le Bois Pyrogene Four destine au traitement du bois a haute temperature, et installation et procede pour sa mise en oeuvre
US7963048B2 (en) * 2005-05-23 2011-06-21 Pollard Levi A Dual path kiln
FR2896033A1 (fr) * 2006-01-10 2007-07-13 Bio 3D Applic Soc Par Actions Systeme et procede de sechage de bois.
WO2007080318A2 (fr) * 2006-01-10 2007-07-19 Bio 3D Applications Systeme et procede de sechage de bois
WO2007080318A3 (fr) * 2006-01-10 2007-09-13 Bio 3D Applic Systeme et procede de sechage de bois
US8844159B2 (en) 2006-01-10 2014-09-30 Holcop System and method for drying wood
EP2037198A2 (fr) * 2007-09-14 2009-03-18 Maschinen- und Stahlbau, Julius Lippert GmbH & Co. KG Installation de séchage d'une multitude de moules en plâtre de préférence en plusieurs parties
EP2037198A3 (fr) * 2007-09-14 2013-05-29 Maschinen- und Stahlbau, Julius Lippert GmbH & Co. KG Installation de séchage d'une multitude de moules en plâtre de préférence en plusieurs parties
US8201501B2 (en) 2009-09-04 2012-06-19 Tinsley Douglas M Dual path kiln improvement
US8342102B2 (en) 2009-09-04 2013-01-01 Douglas M Tinsley Dual path kiln improvement
CN103162524B (zh) * 2013-03-26 2015-09-09 山东临沂烟草有限公司 一种烤烟房用供热炉
CN103162524A (zh) * 2013-03-26 2013-06-19 李玉斌 一种烤烟房用供热炉
CN103245183A (zh) * 2013-04-26 2013-08-14 贵州航天特种车有限责任公司 一种高效节能烘烤装置
CN104522150A (zh) * 2014-11-29 2015-04-22 德清县鑫宝蔬果专业合作社 家用干豆角加工装置
CN104522150B (zh) * 2014-11-29 2017-09-15 广州市中跃通讯设备有限公司 家用干豆角加工装置
ITUB20160210A1 (it) * 2016-01-18 2017-07-18 Fava S P A Stazione di essicazione della pasta del tipo saliscendi, in particolare lasagne, nidi o formati di pasta corta, con ventilazione perfezionata.
CN105928332B (zh) * 2016-05-05 2018-06-29 贵州绿太阳制药有限公司 一种菊花集中供热负压式干燥杀青系统
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
CN113251754A (zh) * 2021-04-01 2021-08-13 江苏双聚智能装备制造有限公司 一种涂装生产线热能循环系统
CN113251754B (zh) * 2021-04-01 2022-08-30 江苏双聚智能装备制造有限公司 一种涂装生产线热能循环系统
CN113865287A (zh) * 2021-10-11 2021-12-31 湖南省南北特食品有限公司 一种高效率的豆干烘干设备

Also Published As

Publication number Publication date
EP1132701A3 (fr) 2003-04-02
FIU20000082U0 (fi) 2000-02-25
FI4462U1 (fi) 2000-06-02

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