EP4368360A1 - Siebvorrichtung zur herstellung von kalibrierten holzspänen zur verwendung in mit pellets betriebenen kesseln und öfen - Google Patents

Siebvorrichtung zur herstellung von kalibrierten holzspänen zur verwendung in mit pellets betriebenen kesseln und öfen Download PDF

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Publication number
EP4368360A1
EP4368360A1 EP23207851.9A EP23207851A EP4368360A1 EP 4368360 A1 EP4368360 A1 EP 4368360A1 EP 23207851 A EP23207851 A EP 23207851A EP 4368360 A1 EP4368360 A1 EP 4368360A1
Authority
EP
European Patent Office
Prior art keywords
wood chips
raw wood
channels
flakes
sieve
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.)
Pending
Application number
EP23207851.9A
Other languages
English (en)
French (fr)
Inventor
Claudio Fagarazzi
Andrea Miceli
Daniele Sarri
Riccardo Lisci
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.)
Universita degli Studi di Firenze
Original Assignee
Universita degli Studi di Firenze
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 Universita degli Studi di Firenze filed Critical Universita degli Studi di Firenze
Publication of EP4368360A1 publication Critical patent/EP4368360A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4663—Multi-layer screening surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469—Perforated sheet-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • B07B1/522—Cleaning with brushes or scrapers with brushes
    • B07B1/524—Cleaning with brushes or scrapers with brushes the brushes being rotating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/55—Cleaning with fluid jets

Definitions

  • the present invention refers to a device for screening raw wood chips, obtained by pre-screening wood chips with a 10x10 mm grid, in order to obtain calibrated wood chips, namely of controlled dimensions, so that they are suitable for use as fuel in pellet stoves and boilers.
  • Raw wood chips are produced with a selected range of forestry chippers capable of producing a raw wood chip with a high percentage of calibrated wood chips (suitable for domestic stoves and boilers).
  • Wood transformed in this way constitutes raw wood chips, namely a plant biomass which, like pellets or firewood, is considered a 100% ecological green biofuel.
  • the calibrated wood chips is the result of screening the raw wood chips and has a width between 3 and 12 mm, a length between 3 and 25 mm and a thickness not exceeding 7 mm, and is suitable for use as fuel in pellet boilers and stoves.
  • raw wood chips on the market are not intended for fuelling pellet-fuelled stoves and boilers because the problem of the dimensional non-homogeneity of the fuel has not been resolved.
  • raw wood chips are mainly obtained with vibrating screens based on vibrating grids, designed to separate the smaller flakes from the wood chips.
  • the elongated wood chips (length ⁇ 25 mm), which are the ones that cause the blocks in the feed screws of pellet stoves and boilers, are not totally eliminated from the mass, so raw wood chips obtained with the current screening technique are not suitable for use as a fuel to replace pellets.
  • Patent CN203304177 (Shaking screener for wood chips) describes a machine of the square-disc-shaped machine body type with centrifugal advancement of material and selection by fall through a passage inside an area with calibrated holes.
  • Patent CN215612307 Wood chip cleaning device for artificial board production describes an industrial-type system for processing waste materials even in the presence of impurities. This system is equipped with sensors for the elimination of stones and metals and includes fans for the removal of plastic materials. The material is subsequently selected by falling through a passage inside an area with calibrated holes. Different dimensional typologies of materials used both for the production of wood fibre-based panels and for other applications in the construction sector are obtained.
  • Patent CN208407613 Wood shavings classified screening machine describes a machine for the selection of woody materials for the production of wooden panels from recycled materials. Up to five different dimensional types of materials are obtained by means of vibrating advancement on calibrated hole gratings.
  • Patent CN206953222 (Wood chip screening system with jumbo size wood chip secondary chipper) describes a composite plate production plant and refers to a wood chip screening system with calibrated hole grids and a jumbo size secondary wood chip chipper.
  • Patent CN108057509 Wood chip separation device describes a machine for the elimination of sawdust and dust from woody material and subsequent selection into two fractions. The separation occurs by gravity through a grating.
  • Object of the present invention is selecting the so-called calibrated wood chips, that is, a woody material divided into flakes of such dimensions that they can be used as fuel in stoves and boilers currently powered by pellets.
  • the invention is an integral part of a new production process that goes from the selection of suitable round wood for the production of calibrated wood chips, to the choice of the most suitable forest chippers, to their optimal setting for the production of "raw wood chips” with the maximum percentage of calibrated wood chips inside, to then move on to its drying and finally to the actual screening and subsequent packaging.
  • Such device which allows the production of wood chips of controlled dimensions, so that it is suitable to be used as fuel in pellet stoves and boilers, it is of the type which involves the passage of such raw wood chips on grids/sieves inclined with respect to the horizontal and subjected to vibration, so as to guide the passage of the raw wood chips above said grids/sieves so that the flakes of said raw wood chips, of dimensions not compliant with use as fuel in boilers and pellet stoves, are separated for other uses.
  • This device includes:
  • This selection occurs following the alignment of the flakes with the prevailing dimension aligned with the direction of said channels.
  • the present invention solves the drawbacks in question as it allows obtaining a surrogate product for wood pellets, which can be used for the same purposes.
  • the present invention instead guarantees the dimensional uniformity of the calibrated wood chips, eliminating all the long and uneven flakes and making the remaining flakes usable in boilers and stoves traditionally fuelled with wood pellets.
  • (1) designates a device for screening calibrated wood chips, namely a vibrating screen with particular elongated vibrating grids/sieves (2, 3) for screening raw wood chips.
  • These grids/sieves (2, 3) have their longitudinal axis which is inclined, with respect to the horizontal, by an angle ⁇ between -15° and 30°, preferably between 0° and 15°, such that the combined effect of vibrations and gravity advances the wood chips.
  • a first grid/sieve (2) provided with a plurality of holes (2a), allows the wood chips to be selected in relation to the size of the flakes. In particular, it allows eliminating dust and flakes that are too small.
  • such first metal grid/sieve (2) with dimensions for example 500x500 mm, is substantially a sieve with the holes (2a) with a circular section, with a diameter of approximately 3 mm, and is suitable for the elimination of dust and flakes smaller than 3 mm.
  • the second grid/sieve (3) with dimensions for example 500x700 mm, has a plurality of parallel channels (3a), on the bottom of which openings (4, 4') are made for selecting and rejecting flakes that are too long.
  • these parallel channels (3a) have a width (or lumen) between 10 and 15 mm, preferably 12 mm, a depth of 10 mm and have a first discharge opening (4) in the terminal part and possibly a second discharge opening (4'), of a square or rectangular shape, made on the bottom of the channels (3a) themselves and with a width equal to the lumen of the channel and a length equal to 10 mm.
  • the first grid/sieve (2) is positioned on a parallel plane, but raised by approximately 20 mm, compared to the plane of the second grid/sieve (3).
  • the procedure for selecting the calibrated chips requires that raw chips (to be screened) are poured directly onto the first grid/sieve (2).
  • the raw wood chips due to the vibrations and inclination of the first grid/sieve (2), moves towards the second grid/sieve (3), namely the one equipped with channels (3a).
  • the material falls from the first grid/sieve (2), onto the second grid/sieve (3), distributing itself rather uniformly among all the channels (3a), and advances due to vibrations and inclination towards the end part of the channels (3a).
  • the wood chip In the channels (3a) the wood chip is oriented with its prevailing dimension in a direction parallel to the channels (3a), so the flakes with a length of less than 25 mm fall through the discharge openings (4, 4') of the channels (3a) and they constitute the actual calibrated wood chips, while the flakes with a length exceeding 25 mm travel along the channels (3a) to the bottom, where they are collected for other energy uses.
  • the sieve according to the invention preferably includes a system for unblocking wood chips along the channels (3a), represented by rotating brushes (not shown) with plastic bristles, which slide at regular intervals along the channels (3a) for the elimination of any occlusion and a system of compressed air nozzles (not shown) placed under the surface of the channels (3a) and oriented towards the discharge openings (4, 4') of the channels (3a) themselves.
  • a system for unblocking wood chips along the channels (3a) represented by rotating brushes (not shown) with plastic bristles, which slide at regular intervals along the channels (3a) for the elimination of any occlusion and a system of compressed air nozzles (not shown) placed under the surface of the channels (3a) and oriented towards the discharge openings (4, 4') of the channels (3a) themselves.
  • the brushes will be conveniently oriented with their axis of rotation perpendicular to the channels (3a) and parallel to the plane of the second grid/sieve (3), so that the tangential speed of the ends of the bristles, at the point of contact, is parallel to the channels (3a) themselves.
  • the direction of rotation must be such as to push the flakes in the opposite direction to the advancement direction of the material.
  • the compressed air programmed regularly, removes any blockages from the openings of the channels (3a).
  • raw wood chips undergo a first screening through the first grid/sieve (2), which eliminates dust and pieces smaller than those of the holes (2a) (3mm).
  • the wood chips deprived of the smaller flakes, pass, due to vibrations and inclination, onto the second grid/sieve (3); again due to the combined effect of vibrations and inclination, the chips run along the channels (3a) of the second grid/sieve (3), with the wood chip flakes orienting themselves with the prevailing dimension in a direction parallel to the channels (3a).
  • the flakes less than 25 mm long are discharged into an underlying container and constitute calibrated wood chips suitable for use in pellet stoves and boilers, while the longer flakes come out of the channels (3a) and are collected as oversized elements for other energy uses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
EP23207851.9A 2022-11-07 2023-11-06 Siebvorrichtung zur herstellung von kalibrierten holzspänen zur verwendung in mit pellets betriebenen kesseln und öfen Pending EP4368360A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200022869 2022-11-07

Publications (1)

Publication Number Publication Date
EP4368360A1 true EP4368360A1 (de) 2024-05-15

Family

ID=84943946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23207851.9A Pending EP4368360A1 (de) 2022-11-07 2023-11-06 Siebvorrichtung zur herstellung von kalibrierten holzspänen zur verwendung in mit pellets betriebenen kesseln und öfen

Country Status (1)

Country Link
EP (1) EP4368360A1 (de)

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU929761A1 (ru) 1980-03-19 1982-05-23 за вители ,vy In Ь1та,7ио.. ,. М.Т.Полыковсмий .. I и .., .J f, SHl JihOii:,K-A Способ сортировани щепы
US4351719A (en) * 1981-02-19 1982-09-28 Morbark Industries, Inc. Vibrating screen apparatus
SE435687B (sv) * 1983-10-06 1984-10-15 Gen Production And Planning Ab Forfarande for sallning av treflis och liknande samt ett sall
BR9303968A (pt) 1992-02-29 1994-08-02 Buehler Ag Dispositivo para separadores planos
RU2047399C1 (ru) * 1991-06-28 1995-11-10 Всесоюзный научно-исследовательский институт гидролиза растительного сырья Установка для получения кондиционного древесного сырья
SE502726C2 (sv) * 1993-07-06 1995-12-18 Rader Int Ab Spaltsåll för träflis och liknande
US6135020A (en) * 1997-11-04 2000-10-24 Broyles; David J. Nut sheller bypass
EP1105221B1 (de) * 1998-07-09 2003-10-08 Metso Paper Pori Oy Verfahren und anlage zum sieben von spänen
CN203304177U (zh) 2013-06-20 2013-11-27 广东始兴县华洲木业有限公司 木片摇动筛选机
ES2449484T3 (es) * 2008-02-04 2014-03-19 Technische Universität Bergakademie Freiberg Procedimiento y dispositivo para seleccionar partículas
RO129451A2 (ro) 2012-10-19 2014-05-30 Victor Spiridon Landes Schemă tehnologică de preparare a minereurilor din zăcământul de la roşia montană şi din alte zăcăminte similare, pentru obţinerea de concentrate îmbogăţite în substanţe minerale utile, devenite materie primă pe flux, pentru obţinerea aurului, argintului şi altor elemente însoţitoare metalice şi nemetalice, fără utilizarea procedeelor de cianurare sau de amalgamare
CN206882116U (zh) * 2017-04-27 2018-01-16 宁国市恒达活性炭有限公司 一种活性炭生产用木屑筛选除物装置
CN206953222U (zh) 2017-06-30 2018-02-02 湖北东润木业有限公司 带有大尺寸木片二次刨片机的木片筛分系统
CN107984580A (zh) 2017-11-24 2018-05-04 万华生态板业(信阳)有限公司 板材刨花的制备方法及人造板的制备方法
CN108057509A (zh) 2016-11-07 2018-05-22 天津市千艺达木业有限公司 一种木屑分离装置
CN208407613U (zh) 2018-03-16 2019-01-22 广东始兴县华洲木业有限公司 一种刨花分级筛选机
CN210207557U (zh) * 2019-03-01 2020-03-31 河南黄河旋风股份有限公司 可以除去木屑的分选筛
IT201900006414A1 (it) 2019-04-29 2020-10-29 Cala S R L Macchina sgusciatrice di frutta secca con gruppi di sgusciatura sovrapposti.
CN212093255U (zh) * 2020-04-27 2020-12-08 广西丰林木业集团股份有限公司 木片筛分系统
IT201900002115U1 (it) 2019-06-28 2020-12-28 Cala S R L Macchina separatrice perfezionata di frutta secca e gusci
CN213529645U (zh) * 2020-10-24 2021-06-25 深圳市诚石环保科技有限公司 一种木屑废料风选装置
CN215612307U (zh) 2021-08-18 2022-01-25 临沂兴滕人造板机械有限公司 一种用于人造板生产的木片清洗装置

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU929761A1 (ru) 1980-03-19 1982-05-23 за вители ,vy In Ь1та,7ио.. ,. М.Т.Полыковсмий .. I и .., .J f, SHl JihOii:,K-A Способ сортировани щепы
US4351719A (en) * 1981-02-19 1982-09-28 Morbark Industries, Inc. Vibrating screen apparatus
SE435687B (sv) * 1983-10-06 1984-10-15 Gen Production And Planning Ab Forfarande for sallning av treflis och liknande samt ett sall
RU2047399C1 (ru) * 1991-06-28 1995-11-10 Всесоюзный научно-исследовательский институт гидролиза растительного сырья Установка для получения кондиционного древесного сырья
BR9303968A (pt) 1992-02-29 1994-08-02 Buehler Ag Dispositivo para separadores planos
SE502726C2 (sv) * 1993-07-06 1995-12-18 Rader Int Ab Spaltsåll för träflis och liknande
US6135020A (en) * 1997-11-04 2000-10-24 Broyles; David J. Nut sheller bypass
EP1105221B1 (de) * 1998-07-09 2003-10-08 Metso Paper Pori Oy Verfahren und anlage zum sieben von spänen
ES2449484T3 (es) * 2008-02-04 2014-03-19 Technische Universität Bergakademie Freiberg Procedimiento y dispositivo para seleccionar partículas
RO129451A2 (ro) 2012-10-19 2014-05-30 Victor Spiridon Landes Schemă tehnologică de preparare a minereurilor din zăcământul de la roşia montană şi din alte zăcăminte similare, pentru obţinerea de concentrate îmbogăţite în substanţe minerale utile, devenite materie primă pe flux, pentru obţinerea aurului, argintului şi altor elemente însoţitoare metalice şi nemetalice, fără utilizarea procedeelor de cianurare sau de amalgamare
CN203304177U (zh) 2013-06-20 2013-11-27 广东始兴县华洲木业有限公司 木片摇动筛选机
CN108057509A (zh) 2016-11-07 2018-05-22 天津市千艺达木业有限公司 一种木屑分离装置
CN206882116U (zh) * 2017-04-27 2018-01-16 宁国市恒达活性炭有限公司 一种活性炭生产用木屑筛选除物装置
CN206953222U (zh) 2017-06-30 2018-02-02 湖北东润木业有限公司 带有大尺寸木片二次刨片机的木片筛分系统
CN107984580A (zh) 2017-11-24 2018-05-04 万华生态板业(信阳)有限公司 板材刨花的制备方法及人造板的制备方法
CN208407613U (zh) 2018-03-16 2019-01-22 广东始兴县华洲木业有限公司 一种刨花分级筛选机
CN210207557U (zh) * 2019-03-01 2020-03-31 河南黄河旋风股份有限公司 可以除去木屑的分选筛
IT201900006414A1 (it) 2019-04-29 2020-10-29 Cala S R L Macchina sgusciatrice di frutta secca con gruppi di sgusciatura sovrapposti.
IT201900002115U1 (it) 2019-06-28 2020-12-28 Cala S R L Macchina separatrice perfezionata di frutta secca e gusci
CN212093255U (zh) * 2020-04-27 2020-12-08 广西丰林木业集团股份有限公司 木片筛分系统
CN213529645U (zh) * 2020-10-24 2021-06-25 深圳市诚石环保科技有限公司 一种木屑废料风选装置
CN215612307U (zh) 2021-08-18 2022-01-25 临沂兴滕人造板机械有限公司 一种用于人造板生产的木片清洗装置

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