EP4291705A1 - Système et procédé d'obtention de fibres à partir d'une charge d'alimentation contenant de la lignocellulose, plus particulièrement de la paille - Google Patents

Système et procédé d'obtention de fibres à partir d'une charge d'alimentation contenant de la lignocellulose, plus particulièrement de la paille

Info

Publication number
EP4291705A1
EP4291705A1 EP22705808.8A EP22705808A EP4291705A1 EP 4291705 A1 EP4291705 A1 EP 4291705A1 EP 22705808 A EP22705808 A EP 22705808A EP 4291705 A1 EP4291705 A1 EP 4291705A1
Authority
EP
European Patent Office
Prior art keywords
screw
refiner
screw conveyor
feed material
rpm
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
EP22705808.8A
Other languages
German (de)
English (en)
Inventor
Achim NEUMÜLLER
Helmut Roll
Fabian KÖFFERS
Michael SCHÖLER
Sven Zimmer
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.)
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Original Assignee
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
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 Siempelkamp Maschinen und Anlagenbau GmbH and Co KG filed Critical Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Publication of EP4291705A1 publication Critical patent/EP4291705A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/22—Disintegrating in mills in magazine-type machines with screw feed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Definitions

  • the invention relates to a plant for obtaining fibers from lignocellulose-containing feed material, in particular from straw, according to the preamble of claim 1, and a corresponding method according to the preamble of claim 12.
  • Fibers are usually obtained from lignocellulosic material by mechanical and/or chemical pulping, whereby as many fibers as possible are separated from the coherent pile structure of the feed material.
  • feed material containing lignocellulose includes substances such as, in particular, fluff chips, annual plants, straw, bagasse and the like. Fibers obtained from this are used in subsequent processes, among other things, as a starting material for the production of wood-based materials and there to a considerable extent for the production of fiberboards such as MDF boards and HDF boards. However, such fibers can also be used for the production of paper, cardboard, etc.
  • EP 3 059 056 A1 describes a process for producing wood fiber boards, in which wood is first comminuted into wood chips and then pretreated using steam in a pre-steaming tank at a temperature of 100° C. to 180° C. and a pressure of 1 bar to 10 bar becomes.
  • the wood chips pretreated in this way are then processed in a refiner in the presence of steam defibrated into fine wood particles at a temperature of 150° C to 200° C and a pressure of 4.5 bar to 16 bar.
  • the resulting wood particles are finally glued and dried and then pressed at a temperature of 170°C to 240°C to form wood fiber boards.
  • the process is essentially continuous, which means that in a preceding process stage, feed material must be made available in the optimum quantity for the subsequent process stage.
  • a uniform and trouble-free flow of the feed material through the refiner is of decisive importance for the economic efficiency of the process and the quality of the manufactured products.
  • the object of the invention is to further develop known systems and methods for obtaining fibers from lignocellulosic material with regard to a flow that is as uniform as possible, in particular through the refiner.
  • the invention is based on the idea of feeding the refiner with feed material continuously and uniformly over the circumference of the refiner tools, not only inside the refiner, but rather already preparing it in the screw conveyor upstream of the refiner.
  • a screw conveyor according to the invention is designed to be operated at a speed of at least 400 rpm. This measure has the effect that material particles loosening from the inner circumference of the screw trough immediately after loosening and thus to a be caught by the rapidly rotating worm gears at a very early stage and subjected to a circular or helical motion.
  • the activated centrifugal forces ensure that the material particles are carried back to the inner circumference of the screw trough so that the layer of feed material there remains intact. In this way it is possible to bring the feed material in a constant flow of material already in the screw conveyor, which can be fed axially to the refiner in the form of a material layer extending evenly over the entire inner circumference of the screw trough.
  • the bulk density of such materials can be, for example, less than 90 kg/m 3 , in special cases less than 70 kg/m 3 or even less than 50 kg/m 3 .
  • a system according to the invention is therefore distinguished from the prior art by an extended field of application.
  • the effect that can be achieved with the invention is essentially dependent on the speed of rotation of the screw flights, the diameter of the screw conveyor and the bulk density of the feed material, which must be matched to one another. Increasing the speed reduces the proportion of good particles that are separated from the flow of material solve. In addition, an increase in the number of revolutions sometimes makes it possible for feed material with a low bulk density to be fed to a refiner in the required manner by means of a screw conveyor. In this sense, preferred embodiments of the invention are designed for increased speeds of the screw conveyor of at least 500 rpm, preferably at least 600 rpm, most preferably at least 700 rpm.
  • the acceleration in the direction of rotation exerted by the rotating augers on the material particles is also dependent on the diameter of the conveyor auger, as this also determines the peripheral speed of the augers. At the same speed, large diameters lead to comparatively higher peripheral speeds than small diameters. Irrespective of the size of the diameter of the conveyor screw, the invention prefers peripheral speeds of the radially outer helical circumference of at least 25 m/s, preferably at least 30 m/s and most preferably at least 40 m/s, which results in the advantages mentioned above.
  • the conveyor screw is held in a pivot bearing at its discharge end.
  • This danger increases in particular with an increase in the speed and/or length of the screw conveyors.
  • the arrangement according to the invention of a pivot bearing at the discharge end of the screw conveyor enables a system according to the invention to be operated without danger for personnel and machines, even at high speeds and/or when long screw conveyors are used. For example, screw conveyors with a length of 5 m or 6 m or longer can be operated without any problems with such a rotary bearing.
  • the rotary bearing is preferably arranged inside the screw trough or in the feed opening of the refiner, ie in the area before entry into the refiner. It is thus accepted that the feed material flows axially through the rotary bearing, which in this embodiment forms a flow obstacle for the material flow.
  • the advantage lies in a comparatively lower constructive effort with regard to the storage of the discharge end of the screw conveyor.
  • the rotary bearing can advantageously have one or more struts which, starting from the bearing area close to the axis, extend to the inner circumference of the screw trough or the entry opening, where they are fastened.
  • the course of the struts can deviate from a radial direction with respect to the axis of rotation, in that the radially inner end is offset relative to the radially outer end in the circumferential direction or in the plane of the pivot bearing, resulting in a slight inclination of the struts or at least the first side of the strut against which the feed material flows in the plane of the pivot bearing.
  • Another preferred measure for minimizing the load on the struts consists in designing the geometry of the strut cross section as a function of the existing crop flow.
  • the second strut side pointing in the opposite direction to the conveying direction of the screw conveyor can be offset in the direction of rotation of the screw helices relative to the third strut side pointing in the conveying direction. In this way, the resulting surfaces connecting the second and third side of the strut are aligned parallel to the crop flow, which minimizes the flow resistance emanating from the rotary bearing.
  • a device for flushing the bearing area of the rotary bearing is optionally provided.
  • a flushing fluid under pressure is driven axially through the sliding joint between the rotating worm shaft and the stationary pivot bearing, which runs concentrically around the axis of rotation, which efficiently prevents foreign particles from penetrating the sliding joint and then into the bearing area.
  • Fig. 2 shows a florizontal section through the plant shown in Fig. 1 along the line II - II there,
  • FIG. 3 shows a vertical section through the system shown in FIG. 2 along line III-III there,
  • FIG. 5 shows an oblique view of an advantageous further development of the rotary bearing with screw conveyor shown in FIG. 4,
  • Figure 6 is a larger-scale axial view of the pivot shown in Figure 5
  • FIG. 7 shows a larger-scale section through the pivot bearing shown in FIG. 6 along the line VII-VII there.
  • the reference number 2 designates a bunker in which the feed material 20, in this case straw, stored and thereby pre-steamed and pre-heated.
  • the feed material 20 passes via the funnel-shaped bunker discharge 3 into a stuffing screw 4 which conveys it to a digester 5 .
  • the feed material 20 is compacted and dewatered in the discharge area of the stuffing screw 4.
  • the digester 5 is designed essentially like a tower and the feed material 20 flows through it from top to bottom.
  • the feedstock 20 is pretreated under the action of pressure and heat, with the aim of softening lignin-containing components in the feedstock 20 and thus preparing the feedstock 20 for fiber digestion.
  • An agitator 47 at the bottom of the digester 5 ensures that the feed material 20 is sufficiently mixed.
  • a conveying device 6 connects to the lower part of the cooker 5, which conveys the feed material 20 to a refiner 7, where the fibers are broken down by applying shearing forces under pressure and steam.
  • the refiner 7 has for this purpose a refining device with first refining tools 9 which are arranged in a ring shape around an axis 8 and are stationary and second refining tools 10 which rotate around the axis 8 and which are axially opposite the first refining tools 9 to form a refining gap 11.
  • the drive unit for the refiner 7 bears the reference number 12 in FIG.
  • the fibers 40 obtained as they pass through the refining gap 11 by means of the refiner tools 9, 10 are guided via a blow line 15 to a dryer (not shown in more detail).
  • the fibers 40 are glued in the blow line 15 and, after drying, are scattered into a mold and pressed into felt fiber boards. The overall process described runs continuously.
  • the conveying device 6 comprises a discharge screw 13 associated with the boiler 5, which is integrated into the lower part of the boiler 5 and opens transversely to its conveying direction into a screw conveyor 14 associated with the refiner 7.
  • the discharge screw 13 essentially comprises a screw trough 16 in which a screw shaft 17 with helix 18 is rotatably mounted in a shaft bearing 19 and is driven by a drive unit 22 via a gear 21 .
  • the screw trough 16 tapers slightly at the discharge end to form a compact, sealing transition to the screw conveyor 14 to train good plugs. Due to the arrangement of the discharge screw 13 directly below the discharge opening 34 of the digester 5, the discharge screw 13 is charged with the pretreated feed material 20.
  • the throughput of the system 1 and in particular of the refiner 7 is set by controlling the speed of the discharge screw 13 .
  • the screw conveyor 14 used to feed the refiner 7 with feed material 20 has a screw trough 23 with a flanged shaft bearing 24 for receiving a conveyor screw 48 coaxial with the axis 8 with a screw shaft 25 and two spirals 29.
  • the discharge-side end of the screw trough 23 is flush with an axis 8 concentric entry opening 26 in the refiner housing.
  • a drive 27 is non-positively connected to the screw shaft 25 via a reduction gear 28 .
  • An electric motor can be used as the drive 27, the speed of which can be continuously adjusted and regulated if a frequency converter is additionally provided.
  • the output shaft of the drive 27 can be coupled directly to the drive shaft of the screw conveyor 14, the speed of the drive also being steplessly adjustable and controllable via a frequency converter.
  • the two parallel spirals 29 are designed like strips and encircle the worm shaft 25 in a helical manner at a clear radial distance from the worm shaft 23, to which they are fastened via a large number of radial folding arms 31.
  • the coils 29 sweep with their respective outer circumferences along the inner circumference of the screw trough 21 and, in the course of their rotation, take the feed material 20 present there in the axial direction to the refiner 7 .
  • the pretreated feed material 20 is metered from the discharge screw 13 to the screw conveyor 14 via its lateral opening 35 radially to the axis 8 and is picked up there by the rotating spirals 29 .
  • the coils 29 initially take the feed material 20 with them in the direction of rotation 49, as a result of which centrifugal forces are activated, which accelerate the feed material 20 radially outwards.
  • the feed material 20 collects on the entire inner circumference of the screw trough 23, where it forms a layer of material.
  • the feed material 20 is conveyed in the form of a material flow by the helixes 29 axially through the entry opening 26 into the active area of the refiner tools 9, 10.
  • the crop flow is symbolized by the arrows 36 in FIG.
  • the speed of the worm shaft 25 with spirals 29 is at least 400 rpm, preferably at least 500 rpm, most preferably at least 600 rpm, in particular at least 700 rpm.
  • circumferential speeds of at least 25 m/s, preferably at least 30 m/s, most preferably at least 35 m/s and in particular more than 40 m/s occur on the outer circumference of the coil.
  • FIG. 4 shows an embodiment of a screw conveyor 14′, which essentially corresponds to the embodiment described above, so that reference is made to the above explanations to avoid repetition.
  • the main difference in this embodiment is the mounting of the screw shaft 25 at the discharge end of the screw conveyor 14' in a rotary bearing 38.
  • the rotary bearing 38 is rigidly connected to the screw trough 23 or the refiner 7, for example on the inner circumference of the screw trough 23 or in the area of the entry opening 26 in the refiner housing.
  • the rotary bearing 38 is designed as a roller bearing, the rotating inner ring 39 of which is seated in a rotationally fixed manner on the end of the worm shaft 25 and the fixed outer ring 41 of which is held in the center of a fastening ring 43 by means of three struts 42 .
  • the fastening ring 43 lies, for example, in a fixed position with its outer circumference on the inner circumference of the screw trough 23, which can be widened in this area, or is mounted between the screw conveyor 14' and the refiner housing or is inserted into the entry opening 26 of the refiner housing.
  • the struts 42' each have a second strut side 45 pointing in the opposite direction to the conveying direction of the screw conveyor 14 and a third strut side 46 pointing in the conveying direction.
  • the second strut side 45 and third strut side 46 are therefore on the opposite sides of the struts 42'.
  • the third strut side 46 is offset relative to the second strut side 45 in the direction of rotation 49 of the conveyor screw 48, which means that the surfaces connecting the second strut side 45 and third strut side 46 run approximately parallel to the flow of material there. In this way, the struts 42' form a minimum flow resistance for the feed material 20 passing through the rotary bearing 38'.
  • Fig. 7 is an embodiment of a screw conveyor 14, in which the pivot bearing 38" is equipped with a flushing device to protect the bearing area from penetrating foreign particles. Only the end section of the conveyor screw 48', which is rotatably held in the pivot bearing 38", can be seen and is supported via the rotary bearing 38" on the inner circumference of the screw trough 23, which is only indicated.
  • the pivot bearing 38" arranged coaxially to the axis 8 corresponds to that described under FIGS. 5 and 6 with regard to the fastening ring 43 and the struts 42', so that what was said there applies accordingly will be explained in detail.
  • the end section of the screw conveyor 48' of the screw conveyor 14 shown in Fig. 7 shows that the screw shaft 25 rotating about the axis 8 is a flea shaft, the wall of which is stepped at the end with a first recess 51 of larger diameter at the end and an axially adjoining second recess 52 of smaller diameter.
  • Inside the worm shaft 25 runs a coaxial, co-rotating flushing pipe 53, via which a pressurized flushing fluid 54 can be fed to the bearing area.
  • the end of the flushing pipe 53 is fixed in a cylindrical bearing disk 55, which has a through hole 56 coaxial with the axis 8 for this purpose. which completely penetrates the flushing pipe 53 .
  • the bearing washer 55 sits positively and non-positively in the second recess 52 of the worm shaft 25.
  • the axially opposite end faces of the flushing head 57 and the bearing sleeve 61 maintain an axial spacing, as a result of which an annular space 65 surrounding the bearing pin 60 is formed.
  • a blind bore 66 is introduced into the flushing head 57 in the axial extension of the flushing pipe 53, which is connected at its base to the annular space 65 via a number of channels 67 running obliquely outwards.
  • the flushing fluid 54 supplied under pressure via the flushing pipe 53 and the flushing head 57 is distributed evenly in the annular space 65, from where it penetrates into the sliding joint 62, flows through it axially and on the opposite side of the sliding joint 62 prevents foreign particles from penetrating into the sliding joint 62 and affect the storage area.
  • the scope of the invention includes not only the combinations of features described in the individual embodiments, but also combinations of features of different embodiments, insofar as these are apparent to a person skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un système et un procédé d'obtention de fibres (40) à partir d'une charge d'alimentation (20) contenant de la lignocellulose, plus particulièrement de la paille, comprenant : un digesteur (5) pour le prétraitement de la charge d'alimentation (20) sous l'effet de la chaleur, de la pression et de l'humidité ; un raffineur (7) pour le défibrage de la charge d'alimentation prétraitée (20) au moyen de deux outils de raffinage (9, 10) qui tournent coaxialement dans le boîtier de raffineur l'un par rapport à l'autre et qui forment un espace de broyage (11) ; et un dispositif de transport (6) pour le transport de la charge d'alimentation prétraitée (20) du digesteur (5) vers le raffineur (7). Le dispositif de transport (6) comprend un transporteur à vis (14) ayant une auge à vis (23) et une vis sans fin (48), circulant dans celle-ci, avec au moins un filet de vis (29), qui s'ouvre axialement dans le raffineur (7) par l'intermédiaire d'une ouverture d'entrée (26) dans le boîtier de raffineur. Pour empêcher que des particules de matière soient libérées de la charge d'alimentation restante, l'invention propose que la vis sans fin (48) du transporteur à vis (14) soit entraînée à une vitesse de rotation d'au moins 400 tours/minute, de préférence de 500 tours/minute ou plus. De cette manière, la charge d'alimentation (29) peut être introduite dans le raffineur sous la forme d'un flux de matériau uniforme.
EP22705808.8A 2021-02-15 2022-02-15 Système et procédé d'obtention de fibres à partir d'une charge d'alimentation contenant de la lignocellulose, plus particulièrement de la paille Pending EP4291705A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021103529 2021-02-15
PCT/EP2022/053716 WO2022171905A1 (fr) 2021-02-15 2022-02-15 Système et procédé d'obtention de fibres à partir d'une charge d'alimentation contenant de la lignocellulose, plus particulièrement de la paille

Publications (1)

Publication Number Publication Date
EP4291705A1 true EP4291705A1 (fr) 2023-12-20

Family

ID=80446786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22705808.8A Pending EP4291705A1 (fr) 2021-02-15 2022-02-15 Système et procédé d'obtention de fibres à partir d'une charge d'alimentation contenant de la lignocellulose, plus particulièrement de la paille

Country Status (2)

Country Link
EP (1) EP4291705A1 (fr)
WO (1) WO2022171905A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE403916B (sv) * 1975-06-04 1978-09-11 Rolf Bertil Reinhall Anordning vid malapparater for lignocellulosahaltigt material
SE413522B (sv) * 1977-01-03 1980-06-02 Reinhall Rolf Bertil Anordning vid framstellning av fibermassa av lignocellulosahaltigt material
US5626300A (en) * 1995-05-03 1997-05-06 Andritz Sprout-Bauer, Inc. Disc refiner with conical ribbon feeder
FI122243B (fi) * 2009-03-17 2011-10-31 Metso Paper Inc Menetelmä ja järjestelmä puuhakkeen tai massakuitujen jauhamiseksi
EP3059056A1 (fr) 2015-02-23 2016-08-24 Basf Se Procédé de fabrication de fibres de bois et panneaux en fibres de bois

Also Published As

Publication number Publication date
WO2022171905A1 (fr) 2022-08-18

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