EP2122049A1 - Procédé et dispositif de séchage d'une bande de matière fibreuse - Google Patents

Procédé et dispositif de séchage d'une bande de matière fibreuse

Info

Publication number
EP2122049A1
EP2122049A1 EP07857911A EP07857911A EP2122049A1 EP 2122049 A1 EP2122049 A1 EP 2122049A1 EP 07857911 A EP07857911 A EP 07857911A EP 07857911 A EP07857911 A EP 07857911A EP 2122049 A1 EP2122049 A1 EP 2122049A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
steam
web
drying zone
hot air
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.)
Granted
Application number
EP07857911A
Other languages
German (de)
English (en)
Other versions
EP2122049B1 (fr
Inventor
Luiz Carlos Da Silva
Thomas Scherb
Peter Kahl
Frank Wegehaupt
Dieter Müller
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2122049A1 publication Critical patent/EP2122049A1/fr
Application granted granted Critical
Publication of EP2122049B1 publication Critical patent/EP2122049B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/20—Waste heat recovery
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a method for drying a fibrous web, in particular paper, board or tissue web, in which the moving fibrous web is acted upon in the region of a predeterminable drying zone with hot air. It further relates to a corresponding drying device and a machine for producing a tissue web with such a drying device.
  • WO 2005/075737 A1 a method of the type mentioned above is already described, which serves to produce a voluminous tissue web and in which a so-called belt press used in conjunction with a hot air hood or alternatively a steam hood for dewatering the fibrous web up to a certain dry content becomes.
  • tissue machines it is important to reduce energy consumption, especially during the drying process, to achieve a predefined dry content.
  • the invention has for its object to provide an improved method and an improved device of the type mentioned, in which the drying process, preferably for the aforementioned method for producing a tissue web, in particular with regard to the energy requirements for the dewatering of the fibrous web is optimized.
  • this object is achieved in that the fibrous web is at least partially applied with steam within the drying zone.
  • the fibrous web preferably tissue web, so hot air and steam is used in combination with each other.
  • the fibrous web is considered in the web running direction within the first half of the total length of the drying zone with steam.
  • the fibrous web is considered in the web running direction, at least at the beginning of the drying zone with steam.
  • the fibrous web viewed in the web running direction, can first be subjected to steam and then to hot air.
  • the fibrous web viewed in the web running direction, is acted upon by steam over at least substantially the entire length of the drying zone.
  • the fibrous web is viewed in the web running direction at least substantially only within the first Third of the total length of the drying zone, and thereby preferably applied at least substantially over this first third of time with steam.
  • the fibrous web is viewed in the web running direction at least substantially only within the first quarter of the total length of the drying zone, and in this case preferably at least substantially over this first quarter away steam is applied.
  • the fibrous web viewed in the web running direction, is only steamed at the beginning of the drying zone.
  • the fibrous web is acted upon over the predetermined drying path away with hot air.
  • the drying zone can be defined at least substantially by the area in which hot air is applied to the fibrous web.
  • the fibrous web can be acted upon in particular within and / or before this drying zone with steam.
  • the fibrous web is subjected at least in some areas at the same time both to hot air and to steam. Under a simultaneous admission is to be understood in each case that a respective point of the fibrous web is acted upon both with hot air and with steam.
  • TAD Through Air Drying
  • a preferred alternative embodiment of the method according to the invention is characterized in that the fibrous web is passed through the drying zone together with at least one permeable band, in particular a structured band, whereby first the permeable band and then the fibrous web are flowed through by the hot air or the steam ,
  • the fibrous web in the drying zone can advantageously be covered by at least one further permeable band, in particular press belt, in which case first the further permeable band or press belt, then the first permeable band or structure band and finally the fibrous web of the hot air or hotfibre web
  • the steam is flowed through.
  • a dewatering belt in particular felt belt, can be guided through the drying zone together with the fibrous web, wherein first the further permeable belt or press belt, then the first permeable belt or structure belt and the fibrous web and finally the additional dewatering belt from the hot air or the Steam flows through, as far as this, as already mentioned, is not condensed in the web.
  • the fibrous web in the drying zone at least in regions to an impingement flow drying.
  • the combined hot air and steam application according to the invention is used in the context of such an impingement flow drying.
  • the fibrous web can at least in some areas also be exposed to throughflow drying.
  • a device for drying a fibrous web, in particular paper, board or tissue web with a drying zone, in the region of the moving fibrous web can be acted upon with hot air said device is characterized in accordance with that the fibrous web Within the drying zone at least partially steam is acted upon.
  • the drying zone can be defined in particular by the dimensions of the hot air hood.
  • a steaming of the fibrous web is advantageously conceivable within and / or in particular before the drying zone.
  • At least one steam blowing device for impinging the fibrous web with steam, at least one steam blowing device, in particular steam blow pipe or steam blow box, is advantageously provided.
  • the steam blower expediently extends at least substantially over the entire width of the hot air hood measured transversely to the web running direction.
  • the steam blower is at least partially disposed within the hot air hood.
  • the steam blowing device can also be arranged directly in front of the hot air hood, as viewed in the web running direction.
  • the relevant steam blower device can moreover be arranged, constructed and / or controlled so that the fibrous web, viewed in the direction of web travel, is acted upon by both hot air and steam at the same time over only a part of the total length of the drying zone or over the entire drying zone.
  • the diameter of the openings of this steam blow pipe is advantageously in a range of about 5 to about 1 mm, and preferably in a range of about 4 to about 2.5 mm.
  • the diameter in question is preferably limited upwards, since a certain speed is required for the steam jet.
  • the distance between the steam blower and the outer permeable belt covering the fibrous web is preferably ⁇ 30 mm, in particular ⁇ 20 mm, in particular ⁇ 15 mm and preferably ⁇ 10 mm.
  • the steam blower device comprises a steam blower tube
  • its openings can advantageously be arranged at a mutual distance ⁇ 20 mm, in particular ⁇ 10 mm and preferably ⁇ 7.5 mm.
  • the steam blower device comprises at least one steam blower box, the moisture transverse profile of the fibrous web can advantageously be adjusted and / or regulated via this.
  • the dry content of the fibrous web can be influenced or adjusted and / or regulated at least substantially via this steam blow pipe.
  • the steam blower device may comprise only at least one steam blow box or only at least one steam blow pipe or else at least one steam blow box or at least one steam blow pipe.
  • means such as a scraper or the like are advantageously provided in order to remove the air boundary layer entrained with the outer permeable band covering the fibrous web prior to entry of the band into the drying area.
  • the hot air for the hot air hood of the drying zone may be at least partially removed from the hood associated with a drying cylinder, in particular a Yankee cylinder.
  • a drying cylinder in particular a Yankee cylinder.
  • the temperature of the exhaust air from such hood associated with, for example, a Yankee cylinder is much higher than the temperature required for the hot air to supply the hot air hood to the drying zone.
  • the temperature of the hood of a drying cylinder, such as in particular a Yankee cylinder removed hot air for example, be about 300 0 C.
  • the hot air hood of the drying zone is at least partially supplied with hot air, the temperature in a range ⁇ 250 0 C, in particular ⁇ 200 0 C and preferably in a range of about 150 0 C to about 200 0 C.
  • the temperature of the hot air for supplying the hot air hood can be adjusted and / or regulated in accordance with the energy consumption in order to optimize the operating point. A higher temperature would usually not result in more efficient drying.
  • At least one evacuated device in particular suction box and / or suction roller, is arranged in the region of the drying zone on the side of the fibrous web or the additional dewatering belt facing away from the hot air hood.
  • the evacuated device may in particular comprise a suction roll with a suction box defining a suction zone.
  • a band press is preferably formed by a further permeable band as a press belt under tension.
  • the press belt is preferably under a high tension in a range of about 40 to about 60 kN / m, thereby exerting a pressing pressure in a press zone, which is preferably in a range of about 0.5 to about 1, 5 bar. It is also particularly advantageous if the length of the press zone formed by the permeable press belt 80, viewed in the web running direction, is defined at least essentially by the wrap area over which the press belt wraps around the suction roll.
  • the length of the press zone formed by the permeable press belt, as considered in the web running direction, can in particular also correspond at least substantially to the length of the suction zone or of the suction box of the suction roll.
  • the drying zone may be shorter than the pressing zone when viewed in the web running direction. In certain cases, however, it is also advantageous if the press zone in the web running direction is equal to or longer than the press zone.
  • the flow rate (l / min) of the steam is preferably less than the flow rate (l / min) of the hot air.
  • the flow rate of the vapor may advantageously be less than 0.5 times, in particular less than 0.3 times, and preferably less than 0.2 times, the flow rate of the hot air.
  • the steam causes an increase in the temperature of the fibrous web to reduce the viscosity of the water in the fibrous web.
  • the steam in the fibrous web, in particular tissue web must condense, since thereby the relevant temperature increase is achieved.
  • This temperature increase can be adjusted for example by an appropriate choice of the correct temperature level for the hot air.
  • the temperature of the hot air impinging on the fibrous web is thus preferably adjustable, in particular for influencing the condensation of the steam in the fibrous web.
  • the fibrous web is guided through the drying zone together with a permeable structured strip, this preferably has a permeability of> 100 cfm, in particular> 300 cfm, in particular> 500 cfm and preferably> 700 cfm.
  • the fibrous web in the drying zone is covered by a permeable press belt which consists at least essentially of plastic, in particular polyamide, polyethylene, polyurethane, etc.
  • the fibrous web in the drying zone can also be covered by a permeable press belt, which is formed by a metal band.
  • At least one belt guided through the drying zone together with the fibrous web is preheated in the web running direction in front of the drying zone. This is expedient in particular in the case where a metal press belt is used.
  • a hot-water heating device is particularly suitable for an inner band guided through the drying zone together with the fibrous web, in particular an additional dewatering belt.
  • the air separation layer entrained on the surface of the outer band may expediently be removed, for example, by means of a scraper extending over the width thereof in front of the hot air hood. This also brings a correspondingly higher temperature after it is avoided that the steam is cooled before entering the fibrous web.
  • the temperature of the hot air can thus be chosen lower.
  • the invention also relates to a machine for producing a tissue web, which is characterized in that it comprises a drying device according to the invention.
  • FIG. 1 is a schematic representation of a conventional, only working with steam drying device and the corresponding dry content gain and the corresponding temperature profile
  • FIG. 2 is a schematic representation of a conventional, only working with hot air drying device and the corresponding dry content gain and the corresponding temperature profile
  • FIG. 3 is a schematic representation of an exemplary embodiment of a machine according to the invention for the production of Development of a tissue web with a drying device according to the invention
  • FIG. 4 shows a simplified schematic representation of a modified embodiment of the drying device according to the invention and the corresponding increase in dry content and the corresponding temperature profile.
  • FIG. 1 shows a schematic representation of a conventional steam-only drying device with a suction roller 12 having a suction zone 10 and a steam blower box 14 opposite the suction zone 10 in the starting region.
  • the tissue web 16 is between an inner dewatering belt 18 or felt and a structured belt 20 together with an outer, here made of metal press belt over the suction roller 12.
  • the bands 18 to 20 are each permeable.
  • the press belt 22 is guided over guide rollers 24 and presses the belts 18 to 22 and the tissue web 16 in the region of the suction zone 10 against the suction roller 12.
  • the temperature T increases. Following this, however, the tissue web 16 already cools down strongly within the suction zone 10 with the intake ambient air. As can be seen from FIG. 1, a dry content increase of about 0.2% occurs, specifically only in the area of the steam blower box 14.
  • FIG. 2 shows a schematic representation of a conventional, working only with hot air drying device.
  • This drying apparatus comprises a suction roller 12 having a suction zone 10 and a hot air hood 26 extending opposite the suction zone 10 and extending over their entire length viewed in the web running direction L.
  • the tissue web 16 is again between one permeable drainage belt 18 or felt and a permeable structured belt 20 together with an outer permeable press belt 22 made of metal over the suction zone 10 of the suction roll 12 out.
  • the dry content increment D in this drying apparatus in which the tissue web 16 is dried by the hot air flowing therethrough, is about 1.5%.
  • the temperature T increases in the region of the suction zone 10 and the hot air hood 26 only slightly.
  • FIG 3 shows a schematic representation of an exemplary embodiment of a machine 28 according to the invention for producing a fibrous web, here for example a tissue web with a drying device 30 according to the invention.
  • the drying device 30 comprises a suction roll 32 having a suction zone 34 defined in particular by an integrated suction box and a hot air hood 36 assigned to the suction roll 32.
  • the fibrous web 38 here for example tissue web
  • a permeable structured band 40 over the suction roll 32
  • the fibrous web 38 lying between the permeable structured band 40 and the suction roll 32.
  • a high-pressure permeable pressing belt 80 is wound around the suction roll 32, whereby a belt press is formed.
  • This press belt 80 which is merely indicated in FIG. 1, can be seen even more clearly in FIG.
  • the hot air from the hot air hood 36 thus flows successively through the permeable press belt 80, the permeable structured belt 40 and the fibrous web 38 into the suction zone 34 of the suction roller 32.
  • a dewatering belt 42 eg felt, may be passed around the suction roll 32 which is between the suction roll 32 and the permeable structured belt 40 and through which the hot air flows into the suction zone 34 of the suction roll 32.
  • the permeable press belt 80, the permeable structured belt 40, the fibrous web 38 and the dewatering belt 42 are successively flowed through by the hot air.
  • the running fibrous web 38 is thus applied over a drying zone away with hot air, said drying zone may be determined at least substantially by the hot air hood 36.
  • this drying zone viewed in the web running direction L, may for example extend at least essentially over the suction zone 34 of the suction roll 32 or, for example, beyond it.
  • the fibrous web 38 is now subjected to hot air in the area of this drying zone and at least partially to steam.
  • the fibrous web 38 viewed in the web running direction L can be acted upon at least at the beginning of the drying zone with steam.
  • the fibrous web 38, viewed in the web running direction L is acted upon with steam only at the beginning of this drying zone. It is considered in the web running direction first with steam and then applied with hot air.
  • At least one steam blower 44 for impinging the fibrous web 38 with steam, at least one steam blower 44, in particular a steam blower pipe or steam blower box, is provided.
  • this steam blower 44 comprises a steam blow pipe, preferably provided at the beginning of the drying zone.
  • the steam blower 44 may extend at least substantially over the entire width of the hot air hood 36 measured transversely to the web running direction L.
  • it is at least partially disposed within the hot air hood 36.
  • the steam blower 44 may, for example, also comprise at least one steam blow box. Also in this case the steam blower box is again located at the beginning of the drying zone defined here at least substantially by the hot air hood 36 and at least substantially inside the hot air hood 36. Also in this case, the fibrous web 38 is thus initially charged with steam and then with hot air.
  • means such as, in particular, a scraper 46 or the like can be provided in order to discharge the air separation layer entrained with the outer permeable structured strip 40 covering the fibrous web 38 before entering the belt 40 into the drying zone.
  • the machine 28 further comprises a former with two converging drainage belts 40, 48, wherein the inner belt simultaneously forms the permeable structured belt 40 in the present case.
  • the two dewatering belts 40, 48 merge to form a pulp inlet gap 50 and are guided over a forming element 52 such as in particular a forming roller.
  • the permeable structured band 40 is formed by the inner dewatering band of the former coming into contact with the forming element 52.
  • the outer dewatering belt 48 which does not come into contact with the forming element 52, is separated again from the fibrous web 38 following the forming element 52.
  • the pulp suspension is introduced into the stock inlet gap 50.
  • a suction element 56 may be provided, through which the fibrous web 38 is held on the permeable structured band 40 or pressed against this permeable structured band 40.
  • the dewatering belt 42 is again separated from the permeable structured belt 40.
  • a pickup or separating element 58 is provided, through which the fibrous web 38 is held at the separation of the dewatering belt 42 to the permeable structured band 40.
  • the fibrous web 38 is guided together with the permeable structured band 40 through a press nip 64 formed between a drying cylinder 60 preferably formed by a Yankee cylinder and a pressing element 62 such as a press roll.
  • the pressing element 62 in the present case is, for example, a shoe press roll.
  • the permeable structured band 40 is again separated from the drying cylinder 60, while the fibrous web 38 remains on the drying cylinder 60.
  • the drying cylinder 60 is associated with a hood 66.
  • a vacuum box with a hot air hood 68 or the like may be provided between the suction roll 32 and the drying cylinder 60 to increase the sheet strength.
  • the hot air for the hot air hood 36 assigned to the suction roll 32 can at least partially be taken from the hood 66 assigned to the drying cylinder 60. be men.
  • the hood 66 removed this hot air has a temperature, for example in the range of about 300 0 C, which is generally higher than that required for the hot air of the hot air box 36 te.
  • the hot air taken from the hood associated with the drying cylinder 66 can be supplied to the hot air hood 36 via a feed line 70, in which at least one valve 72, in particular a control valve, can be arranged.
  • a filter 74 may be provided for the removal of in particular short fibers, dust or the like.
  • a fan may be arranged in this supply line 70.
  • the hot air taken from the hood 60 associated with the cylinder 60 can also be mixed with cold air supplied via a line 76. Also in the line 76 for the supplied cold air again at least one valve 78, in particular control valve may be provided. About the mixing ratio of the hood 66 removed hot air and the cold air so the temperature of the hot air hood 36 supplied air can be adjusted.
  • the steam blower 44 comprises a steam blower box arranged at least substantially inside the hot air hood 36 instead of a steam blow pipe.
  • This steam blower box viewed in the web running direction L, is again provided at the beginning of the drying zone defined here at least essentially by the hot air hood 36.
  • the present embodiment also differs from that of FIG. 3 in that, in addition to the permeable structured band 40 and the dewatering band 42 or felt, a permeable press belt 80 together with the fibrous web 38 is passed through the drying zone, through which the permeable structured band 40, the fibrous web 38 and the permeable dewatering belt 42 in the region of the suction zone 34 are pressed against the suction roll 32.
  • the press belt 18 is viewed in the web running direction L before and behind the drying zone each guided around a guide roller 82, via which the relevant voltage for the press belt 80 is generated.
  • a relatively high temperature T results relative to the entire suction zone, which here simultaneously defines the drying zone T. Accordingly, a relatively high dry content gain, here for example about 3%, also arises.
  • suctioned device suction roll

Abstract

L'invention concerne un procédé de séchage d'une bande de matière fibreuse, notamment d'une bande de papier, de carton ou de tissu, selon lequel la bande circulante de matière fibreuse est sollicitée par de l'air chaud dans la région d'une zone de séchage pouvant être prédéfinie. Selon l'invention, la bande de matière fibreuse est, à l'intérieur de la zone de séchage, sollicitée au moins sectoriellement par de la vapeur. L'invention concerne également un dispositif de séchage correspondant.
EP07857911.7A 2006-12-22 2007-12-20 Procédé et dispositif de séchage d'une bande de matière fibreuse Not-in-force EP2122049B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006062234A DE102006062234A1 (de) 2006-12-22 2006-12-22 Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
PCT/EP2007/064290 WO2008077869A1 (fr) 2006-12-22 2007-12-20 Procédé et dispositif de séchage d'une bande de matière fibreuse

Publications (2)

Publication Number Publication Date
EP2122049A1 true EP2122049A1 (fr) 2009-11-25
EP2122049B1 EP2122049B1 (fr) 2015-12-02

Family

ID=39226664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857911.7A Not-in-force EP2122049B1 (fr) 2006-12-22 2007-12-20 Procédé et dispositif de séchage d'une bande de matière fibreuse

Country Status (5)

Country Link
US (1) US8435384B2 (fr)
EP (1) EP2122049B1 (fr)
CA (1) CA2673181A1 (fr)
DE (1) DE102006062234A1 (fr)
WO (1) WO2008077869A1 (fr)

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Also Published As

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US8435384B2 (en) 2013-05-07
US20090283234A1 (en) 2009-11-19
DE102006062234A1 (de) 2008-06-26
CA2673181A1 (fr) 2008-07-03
EP2122049B1 (fr) 2015-12-02
WO2008077869A1 (fr) 2008-07-03

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