EP1959053B1 - Machine pour fabriquer une band de matière fibreuse avec un dispositif de séchage de la bande au moyen d'air chaud - Google Patents

Machine pour fabriquer une band de matière fibreuse avec un dispositif de séchage de la bande au moyen d'air chaud Download PDF

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Publication number
EP1959053B1
EP1959053B1 EP08150640A EP08150640A EP1959053B1 EP 1959053 B1 EP1959053 B1 EP 1959053B1 EP 08150640 A EP08150640 A EP 08150640A EP 08150640 A EP08150640 A EP 08150640A EP 1959053 B1 EP1959053 B1 EP 1959053B1
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EP
European Patent Office
Prior art keywords
machine according
feed air
air chamber
fibrous web
suction
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.)
Not-in-force
Application number
EP08150640A
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German (de)
English (en)
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EP1959053A1 (fr
Inventor
Christian MÜNCH
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
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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
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Priority to PL08150640T priority Critical patent/PL1959053T3/pl
Publication of EP1959053A1 publication Critical patent/EP1959053A1/fr
Application granted granted Critical
Publication of EP1959053B1 publication Critical patent/EP1959053B1/fr
Not-in-force legal-status Critical Current
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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
    • D21F11/006—Making patterned paper
    • 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
    • D21F5/02—Drying on cylinders
    • 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

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular paper, board or tissue web, with a device for drying the fibrous web by means of hot air according to the preamble of claim 1.
  • the document WO 96/29467 describes a method of dewatering a web of cellulosic material having a basis weight between 10 and 80 g / m 2 . After dewatering, the web is placed on a permeable belt on the forming fabric and flowed through by a stream of hot air at a speed of between 5 and 50 m / s, under which pressure a vacuum of 100 to 500 millibars is produced under the permeable belt.
  • GB2122322A is a through-flow dryer with a flow-through and a partially surrounding hood revealed.
  • the drying air passes through the hood through the fibrous web in the flow-through. From there it is at least partially fed into a mixer for mixing with hot air, which is supplied via a line from a burner to the mixer. Subsequently, the air mixture is fed back to the hood.
  • a first flap and therebetween an exhaust duct with a second flap is provided in the event of a fault. In the event of a fault, the first flap is closed and the second flap is opened. This prevents overheating in the area of the flow-through cylinder.
  • the document WO03 / 000988 A1 shows an arrangement of an impingement blow drying in a dryer section of a paper machine, which comprises a impingement flow cylinder with a hood.
  • the drying air is fed through a blower integrated in the hood via nozzles of the paper web and fed from there again in a Kr-skating the hood.
  • Another prior art relates to an apparatus for drying a tissue web by a Yankee drying cylinder with a hood ( US4,615,122 ).
  • the drying air of this impingement flow dryer is at least partially recirculated via the hood, via a burner and via a heat exchanger with boiler back to the hood.
  • the exhaust air of the hood is heated by the burner and partially cooled in the heat exchanger.
  • the heat of the heated exhaust air is used in the heat exchanger to generate steam, wherein the steam generated is used to heat the Yankee drying cylinder.
  • the document WO01 / 00925 A1 describes a process for producing a tissue web with an embossed surface.
  • the tissue web is formed in the Formierpartie and then in a press between an embossing belt and a Felt pressed and embossed.
  • the further drying takes place in a pre-dryer by means of impingement flow, in which the tissue web is not traversed by air and then through a Yankee drying cylinder.
  • the exhaust air from the impingement hood of the pre-dryer is slid to the hood of the Yankee drying cylinder and used there for further drying of the tissue web.
  • the invention has for its object to provide an improved machine of the type mentioned.
  • the machine should in particular be optimized so that the energy required for the hot air drying process energy consumption is reduced to a minimum.
  • an overpressure in the range of about 0 to about 0.5 bar and preferably in a range of about 0.002 to about 0.3 bar prevails.
  • a negative pressure in a range of about 0 to about 0.8 bar and preferably in a range of about 0.2 to about 0.7 bar prevails.
  • a negative pressure prevails in the exhaust air chamber in a range from about 0.4 to about 0.7 bar.
  • the pressure increasing device comprises at least one fan, which may be, for example, a multi-stage fan or a single-stage fan.
  • a blower in question is sold under the name "Tubair”.
  • the pressure increasing device may also comprise at least one radial fan and / or at least one axial fan.
  • the temperature of the supply air or supply air portion originating from the pressure increasing device is preferably ⁇ 100 ° C, in particular ⁇ 150 ° C and preferably ⁇ 200 ° C.
  • the supply air chamber is supplied with more than 50%, in particular more than 60%, in particular more than 70% and preferably more than 80%, of the supply air from the pressure side of the pressure increasing device.
  • the supply air chamber is supplied at least substantially 100% of the supply air from the pressure side of the pressure increasing device.
  • a heating device which serves to increase the supply air temperature, in particular adjustable and / or controllable, is provided.
  • the heating device may in particular comprise a gas burner, a gas turbine and / or the like.
  • a water separator in particular a condensation device, is provided for removing water from the exhaust air.
  • the fibrous web together with a permeable structured band serving to provide the fibrous web with a three-dimensional surface structure, may be passed over the suction roll with the fibrous web between the permeable structured band and the suction roll and the hot supply air from that associated with the suction roll Hood successively through the permeable structured band and the fibrous web passes into the suction box of the suction roll.
  • the permeable structured band and the fibrous web are preferably pressed against the suction roll via a permeable pressing belt, wherein the hot supply air from the hood associated with the suction roll is conveyed successively through the permeable pressing belt, the permeable structured band and the fibrous web passes into the suction box of the suction roll.
  • a dewatering belt may be passed around the suction roll, which is between the suction roll and the permeable structured strip and through which the hot supply air flows into the suction box of the suction roll.
  • the hot air taken from the hood assigned to the drying cylinder can be fed, in particular as supplementary air, to a pressure-side nozzle and / or a suction-side nozzle of the pressure-increasing device.
  • At least one water separator is provided in an exhaust air discharge line connected to the exhaust air chamber, in a suction-side pipe of the pressure-increasing device and / or in a pressure-side pipe of the pressure-increasing device.
  • the water separator is preferably provided in the flow direction of the recirculated exhaust air in front of the increase of the supply air temperature serving heater and / or provided before the point at which the hood of the drying cylinder removed hot air is supplied.
  • Fig. 1 shows a schematic representation of a machine 10 for producing a provided with a three-dimensional surface structure fibrous web 12, which is provided with a device comprising a hot air circuit 14 for drying the fibrous web 12.
  • the fibrous web 12 may in particular be a paper, board or tissue web.
  • the drying device 14 comprises a suction roll 16 with a suction box 18 forming an exhaust air chamber and a hood 20 associated with the suction roll 16 and forming a supply air chamber.
  • the fibrous web 12 is guided together with a permeable structured band 22 on the suction roller 16, wherein the fibrous web 12 between the permeable structured band 22 and the suction roller 16 is located.
  • the permeable structured band 22 and the fibrous web 12 are pressed for example by a permeable pressing belt 24 against the suction roller 16.
  • a permeable pressing belt 24 against the suction roller 16.
  • the hot air from the hood 20 successively flows through the permeable press belt 24, the permeable structured belt 22 and the fibrous web 12 into the suction box 18 of the suction roller 16.
  • a dewatering belt 36 may be passed around the suction roll 16 which lies between the suction roll 16 and the permeable structured ribbon 22 and through which the hot supply air flows into the suction box 18 of the suction roll 16.
  • the permeable press belt 24, the permeable structured belt 22, the fibrous web 12 and the dewatering belt 36 are successively flowed through by the supply air.
  • the machine 10 further comprises a former with two converging drainage belts 22, 26, wherein the inner belt simultaneously forms the permeable structured belt 22 in the present case.
  • the two drainage tapes 22, 26 converge to form a stock inlet gap 28 and are passed over a forming element 30 such as in particular a forming roller.
  • the permeable structured band 22 is formed by the inner dewatering band of the former coming into contact with the forming element 30.
  • the outer dewatering belt 26, which does not come into contact with the forming element 30, is separated again from the fibrous web 12 and the permeable structured belt 22 carrying it after the forming element 30.
  • the pulp suspension is introduced into the stock inlet gap 28.
  • a suction element 14 is provided, through which the fibrous web 12 is held on the permeable structured band 22 or pressed against this permeable structured band 22.
  • the dewatering belt 36 is again separated from the permeable structured belt 22 and the fibrous web 12.
  • a pickup or separating element 38 is provided behind the drying device 14, through which the fibrous web 12 is held at the separation of the dewatering belt 36 to the permeable structured belt 22.
  • the fibrous web 12 is guided together with the permeable structured band 22 by a press nip 44 formed between a drying cylinder 40 preferably formed by a Yankee cylinder and a pressing element 42, such as a press roll. Behind this press nip 44, the permeable structured band 22 is again separated from the drying cylinder (40), while the fibrous web 12 remains on the drying cylinder 40.
  • the drying cylinder 40 is associated with a hood 46.
  • drying cylinder 40 may be associated with a spray tube 48 for coating or the like.
  • At least one so-called Uhle box 50 and / or at least one spray tube 52 may be associated with the permeable structured band 22 and the drainage band 36.
  • the device 14 is used to dry the fibrous web 12 by means of hot air, by the fibrous web 12 is supplied with the drying serving supply air from the suction roller 16 associated hood 20.
  • the drying process accumulated exhaust enters the suction box 18 of the suction roller 16.
  • the exhaust air from the suction box 18 is at least partially the suction side 54 of a pressure increasing device 56, respectively.
  • the hood 20 associated with the suction roll 16 is then supplied with at least part of the supply air from the pressure side 58 of the pressure increasing device 56. It is thus formed a drying of the fibrous web 12 serving hot air circuit.
  • the pressure increasing device 56 may comprise at least one fan, which may be single-stage or multi-stage.
  • supply air supply line 60 can be provided to increase the supply air temperature serving heat exchanger or in particular adjustable and / or controllable heater 62.
  • the heating device 62 comprises, for example, a burner, in particular a gas burner. It is also conceivable, for example, the use of a gas turbine.
  • a water separator 64 in particular a condensation device, can be provided for removing water from the exhaust air.
  • a water separator 64 is arranged in an exhaust air discharge line 66 connected to the suction box 18 of the suction roll 16.
  • Such a water separator can in principle also be provided, for example, in a suction-side nozzle and / or in a pressure-side nozzle of the pressure-increasing device 56.
  • the supply of suction air supplied to the suction roller 16 is partially also taken from the hood 40 associated with the drying cylinder 40.
  • the hot air taken from this hood 40 associated with the drying cylinder 40 can be supplied as supplementary air to the pressure-side nozzle and / or the suction-side nozzle of the pressure-increasing device 56.
  • a further pressure increasing means may be arranged.
  • a filter 72 may be provided in this supply line 68.
  • a control valve 74 may be arranged in the supply air supply line 60 between the pressure booster 56 and the drying device 14.
  • Fig. 2 shows a schematic cross-sectional view of an exemplary embodiment of the pressure increasing device 56, which can be designed here as a single-stage fan I or as a multi-stage fan II.
  • this fan can be expediently provided with terminals Q Zi for different vacuum heights.
  • the suction roller 16 is associated with the hood 20 at least substantially in the region of the suction box 18.
  • This is supplied with hot and dry as possible supply air, which by the permeable or open structured band 22, which may be in particular a screen, covered fibrous web 12 flows and is discharged via the suction box 18 as exhaust air again. It has been found to be beneficial for an efficient drying process when the air temperature is ⁇ 100 ° C. This is particularly important when steam is used to heat the fibrous web 12.
  • the hood intake air and the suction roll exhaust air are now at least partly recirculated via the pressure increasing device 56.
  • the arrangement is selected on the one hand so that the temperature increase is used by the occurring in the temperature increase device 56 compression for increasing the dewatering process, while on the other hand, the heat exhaust air is reused.
  • supplementary air can be supplied to the pressure-side connection piece and / or the suction-side connection piece of the pressure increase device 56.
  • a condensation device for removing the water in the exhaust air can also be provided.
  • a heater for the supply air is conceivable, in particular to have a control and / or adjustment for the air temperature.

Claims (24)

  1. Machine pour fabriquer une bande de matière fibreuse (12), en particulier une bande de papier, de carton ou d'essuie-tout, avec un dispositif (14) pour le séchage de la bande de matière fibreuse (12) au moyen d'air chaud, dispositif qui comprend un dispositif de séchage à circulation continue avec une chambre d'air frais (20) et une chambre d'air vicié (18), dans laquelle la bande de matière fibreuse (12) est exposée à l'air frais provenant de la chambre d'air frais (20) et destiné au séchage et l'air vicié produit lors de l'opération de séchage arrive dans la chambre d'air vicié (18), dans laquelle l'air vicié provenant de la chambre d'air vicié (18) est envoyé au moins en partie au côté d'aspiration (54) d'un dispositif d'augmentation de la pression (56) et au moins une partie de l'air frais provenant du côté de refoulement (58) du dispositif d'augmentation de la pression (56) est envoyée à la chambre d'air frais (20), et dans laquelle la chambre d'air vicié est formée par le caisson d'aspiration (18) d'un rouleau aspirant (16) et la chambre d'air frais est formée par une hotte (20) associée à ce rouleau aspirant (16), caractérisée en ce que l'air frais envoyé à la chambre d'air frais (20) est prélevé en partie dans une hotte (46), qui est associée à un cylindre de séchage (40), en particulier un cylindre frictionneur, qui forme avec un élément de pressage (42) une fente de pressage (44), à travers laquelle la bande de matière fibreuse (12) est conduite à la suite du rouleau aspirant (16).
  2. Machine selon la revendication 1, caractérisée en ce qu'il règne dans la chambre d'air frais (20) une surpression (Pü) comprise dans la plage d'environ 0 à environ 0,5 bar et de préférence dans une plage d'environ 0,002 à environ 0,3 bar.
  3. Machine selon la revendication 1 ou 2, caractérisée en ce qu'il règne dans la chambre d'air frais (20) une surpression (Pü) ≥ 0,01, en particulier ≥ 0,02 et de préférence ≥ 0,05 bar.
  4. Machine selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'il règne dans la chambre d'air vicié (18) une dépression (Pu) comprise dans une plage d'environ 0 à environ 0,8 bar et de préférence dans une plage d'environ 0,2 à environ 0,7 bar.
  5. Machine selon la revendication 4, caractérisée en ce qu'il règne dans la chambre d'air vicié (18) une dépression (Pu) comprise dans une plage d'environ 0,4 à environ 0,7 bar.
  6. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif d'augmentation de la pression (56) comprend au moins une soufflante.
  7. Machine selon la revendication 6, caractérisée en ce que le dispositif d'augmentation de la pression (56) comprend au moins une soufflante à plusieurs étages.
  8. Machine selon la revendication 6 ou 7, caractérisée en ce que le dispositif d'augmentation de la pression (56) comprend au moins une soufflante à un étage.
  9. Machine selon l'une quelconque des revendications 6 à 8, caractérisée en ce que le dispositif d'augmentation de la pression (56) comprend au moins une soufflante radiale.
  10. Machine selon l'une quelconque des revendications 6 à 9, caractérisée en ce que le dispositif d'augmentation de la pression (56) comprend au moins une soufflante axiale.
  11. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la température de l'air frais ou de la fraction d'air frais provenant du dispositif d'augmentation de la pression (56) est ≥ 100°C, en particulier ≥ 150°C et de préférence ≥ 200°C.
  12. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que plus de 50 %, en particulier plus de 60 %, en particulier encore plus de 70 % et de préférence plus de 80 % de l'air frais en provenance du côté de refoulement (58) du dispositif d'augmentation de la pression (56) sont envoyés à la chambre d'air frais (20).
  13. Machine selon la revendication 12, caractérisée en ce qu'au moins essentiellement 100 % de l'air frais en provenance du côté de refoulement (58) du dispositif d'augmentation de la pression (56) sont envoyés à la chambre d'air frais (20).
  14. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu un échangeur de chaleur destiné à augmenter la température de l'air frais en particulier dans une conduite d'arrivée d'air frais raccordée à la chambre d'air frais (20).
  15. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu un dispositif de chauffage (62), en particulier réglable et/ou ajustable, destiné à augmenter la température de l'air frais, en particulier dans une conduite d'arrivée d'air frais raccordée à la chambre d'air frais.
  16. Machine selon la revendication 15, caractérisée en ce que le dispositif de chauffage (62) comprend un brûleur à gaz.
  17. Machine selon la revendication 15, caractérisée en ce que le dispositif de chauffage (62) comprend une turbine à gaz.
  18. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu un séparateur d'eau (64), en particulier un dispositif de condensation, pour éliminer l'eau hors de l'air vicié.
  19. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de matière fibreuse (12) est conduite sur le rouleau aspirant (16) en compagnie d'une bande structurée perméable (22), qui est destinée à doter la bande de matière fibreuse (12) d'une structure superficielle tridimensionnelle, dans laquelle la bande de matière fibreuse (12) est placée entre la bande structurée perméable (22) et le rouleau aspirant (16), et l'air chaud provenant de la hotte (20) associée au rouleau aspirant (16) circule successivement à travers la bande structurée perméable (22) et la bande de matière fibreuse (12) vers le caisson d'aspiration (18) du rouleau aspirant (16).
  20. Machine selon la revendication 19, caractérisée en ce que la bande structurée perméable (22) et la bande de matière fibreuse (12) sont pressées contre le rouleau aspirant (16) au moyen d'une bande de pressage perméable (24) et l'air chaud provenant de la hotte (20) associée au rouleau aspirant (16) circule successivement à travers la bande de pressage perméable (24), la bande structurée perméable (22) et la bande de matière fibreuse (12), vers le caisson d'aspiration (18) du rouleau aspirant (16).
  21. Machine selon la revendication 19 ou 20, caractérisée en ce qu'une bande d'essorage (36) est en plus conduite autour du rouleau aspirant (16) et est placée entre le rouleau aspirant (16) et la bande structurée perméable (22), et à travers laquelle l'air chaud circule vers le caisson d'aspiration (18) du rouleau aspirant (16).
  22. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que l'air chaud prélevé dans la hotte (46) associée au cylindre de séchage (40) est envoyé au titre d'air d'appoint à un tuyau côté refoulement et/ou à un tuyau côté aspiration du dispositif d'augmentation de la pression (56).
  23. Machine selon l'une quelconque des revendications 18 à 24, caractérisée en ce qu'il est prévu au moins un séparateur d'eau (64) dans une conduite d'évacuation d'air vicié (66) raccordée à la chambre d'air vicié (18), dans un tuyau côté aspiration du dispositif d'augmentation de la pression (56) et/ou dans un tuyau côté refoulement du dispositif d'augmentation de la pression (56).
  24. Machine selon la revendication 23, caractérisée en ce que le séparateur d'eau (64), considéré dans la direction d'écoulement de l'air vicié recyclé, est prévu avant le dispositif de chauffage (62) destiné à augmenter la température de l'air frais et/ou avant l'endroit où l'air chaud prélevé dans la hotte (46) du cylindre de séchage (40) est envoyé.
EP08150640A 2007-02-13 2008-01-25 Machine pour fabriquer une band de matière fibreuse avec un dispositif de séchage de la bande au moyen d'air chaud Not-in-force EP1959053B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08150640T PL1959053T3 (pl) 2007-02-13 2008-01-25 Maszyna do wytwarzania wstęgi materiału włóknistego z urządzeniem do suszenia wstęgi materiału włóknistego za pomocą gorącego powietrza

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007006960A DE102007006960A1 (de) 2007-02-13 2007-02-13 Vorrichtung zur Trocknung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1959053A1 EP1959053A1 (fr) 2008-08-20
EP1959053B1 true EP1959053B1 (fr) 2010-12-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08150640A Not-in-force EP1959053B1 (fr) 2007-02-13 2008-01-25 Machine pour fabriquer une band de matière fibreuse avec un dispositif de séchage de la bande au moyen d'air chaud

Country Status (7)

Country Link
US (1) US8196314B2 (fr)
EP (1) EP1959053B1 (fr)
AT (1) ATE492685T1 (fr)
CA (1) CA2620781A1 (fr)
DE (2) DE102007006960A1 (fr)
ES (1) ES2355689T3 (fr)
PL (1) PL1959053T3 (fr)

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EP2896743A1 (fr) 2014-01-20 2015-07-22 Valmet S.p.A. Procédé et machine de fabrication d'une bande de papier de soie

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DE102009000753A1 (de) 2009-02-11 2010-08-12 Voith Patent Gmbh Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
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DE102009001872A1 (de) 2009-03-26 2010-09-30 Voith Patent Gmbh System zur computergestützten Optimierung des Gesamtwirkungsgrades einer Produktionsanlage
DE102011075678A1 (de) 2011-05-11 2012-11-15 Voith Patent Gmbh System zur computergestützten Optimierung des Energieverbrauchs einer Produktionsanlage
US8968517B2 (en) 2012-08-03 2015-03-03 First Quality Tissue, Llc Soft through air dried tissue
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WO2015107094A1 (fr) 2014-01-20 2015-07-23 Valmet S.P.A. Procédé et machine permettant de fabriquer une feuille continue de papier de soie
US9702084B2 (en) 2014-01-20 2017-07-11 Valmet S.P.A. Process and a machine for making a tissue paper web

Also Published As

Publication number Publication date
US8196314B2 (en) 2012-06-12
PL1959053T3 (pl) 2011-05-31
EP1959053A1 (fr) 2008-08-20
ES2355689T3 (es) 2011-03-30
DE502008002037D1 (de) 2011-02-03
DE102007006960A1 (de) 2008-08-14
ATE492685T1 (de) 2011-01-15
US20080189981A1 (en) 2008-08-14
CA2620781A1 (fr) 2008-08-13

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