EP2396468B1 - Verfahren und vorrichtung zur trocknung einer faserstoffbahn - Google Patents

Verfahren und vorrichtung zur trocknung einer faserstoffbahn Download PDF

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Publication number
EP2396468B1
EP2396468B1 EP10701524.0A EP10701524A EP2396468B1 EP 2396468 B1 EP2396468 B1 EP 2396468B1 EP 10701524 A EP10701524 A EP 10701524A EP 2396468 B1 EP2396468 B1 EP 2396468B1
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EP
European Patent Office
Prior art keywords
air
drying zone
heat exchanger
hood
supplied
Prior art date
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Active
Application number
EP10701524.0A
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German (de)
English (en)
French (fr)
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EP2396468A1 (de
Inventor
Thomas Scherb
Joao Victor Boechat
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2396468A1 publication Critical patent/EP2396468A1/de
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Publication of EP2396468B1 publication Critical patent/EP2396468B1/de
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    • 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
    • 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
    • D21F5/18—Drying webs by hot air
    • D21F5/181—Drying webs by hot air on Yankee cylinder

Definitions

  • the invention relates to a process for drying a fibrous web, in particular cardboard, paper or tissue web, in which the moving fibrous web is subjected to steam and hot, moist air in the region of a preceding drying zone and is fed to a downstream drying zone following the preceding drying zone comprising a drying cylinder, in particular Yankee cylinder, as well as a hood associated therewith. It further relates to a machine for producing a fibrous web, in particular paper, board or tissue web, the specified in the preamble of claim 8 Art.
  • the document WO 2009/117751 A1 discloses a drying device for moving material webs with at least two successive drying groups, each with a plurality of heatable drying cylinders.
  • the drying cylinders of the first drying group are steam-heated drying cylinders, with a first heat cycle being provided for the steam.
  • the drying cylinders of a second drying group are heated by the combustion of a combustible energy carrier and have a discharge for the waste heat. It is a first heat exchanger provided which couples the first heat cycle and the discharge for the waste heat.
  • the document WO 031078728 A2 describes a drying device with at least one drying cylinder group and at least one impingement drying unit, as well as a combustion turbine.
  • the combustion gases of the combustion turbine are guided at least into the impingement drying unit as impingement air.
  • the high energy exhaust air from the hood associated with the Yankee cylinder has been used primarily to preheat the hood combustion air for the Yankee dryer and water used in the paper machine.
  • the invention has for its object to provide an improved method and an improved device or machine of the type mentioned, in which the drying process is further optimized, in particular with regard to the energy requirements for the dewatering of the fibrous web.
  • the drying process is to be optimized in particular in a combined drying in a belt press and a subsequent, a Yankee cylinder with associated drying hood comprehensive drying unit.
  • this object is achieved in that the drying cylinder of the downstream drying zone associated hood hot air, in particular exhaust air is removed, that for generating at least a portion of the steam for the preceding drying zone by means of a first heat exchanger in the drying cylinder of the downstream drying zone condensate and / or fresh water is heated by the hood removed hot air.
  • the hot air removed from the hood and passed through the first heat exchanger is fed to the preceding drying zone.
  • the steam consumed from the steam generator is significantly reduced, thereby correspondingly reducing the total energy consumption.
  • heat for the production of steam is recovered, which is then used in the papermaking process.
  • the energy is used, which is released due to the enthalpy drop of the exhaust air of the dryer cylinder or Yankee cylinder associated hood.
  • steam is generated on the one hand.
  • the lower temperature hot air exiting from the heat exchanger is further used in the papermaking process, whereby the steam produced and the hot air cooled to a lower temperature can be further used, in particular in a belt press.
  • the method according to the invention is from the supplied condensate and / or fresh water directly Steam is generated by means of the first heat exchanger and this steam is supplied to the preceding drying zone.
  • the condensate and / or fresh water is first heated by means of the first heat exchanger. Following this first heat exchanger, the heated condensate and / or Fresh water then fed to a flash evaporator, in which case the vapor generated by the flash evaporation is supplied to the preceding drying zone.
  • condensate obtained in the flash evaporation is returned to the first heat exchanger and heated therein by the hot air taken from the hood together with the condensate and / or the fresh water accumulating in the drying cylinder of the downstream drying zone.
  • fresh air is heated by means of a second heat exchanger through the hot air removed from the hood and the fresh air thus heated is fed to the hood associated with the drying cylinder of the downstream drying zone as combustion air and / or make-up air.
  • make-up air is meant, for example, air for preheating the drying zone and / or the drying system. Preheating is carried out, for example, when starting the tissue machine.
  • the withdrawn hot air can advantageously be passed first through the provided for heating the condensate and / or fresh water first heat exchanger and then through the provided for heating the fresh air second heat exchanger before it is fed to the preceding drying zone.
  • the hot air removed from the hood prefferably heated first by the second heat exchanger provided for heating the fresh air and then by the first heat exchanger provided for heating the condensate and / or fresh water pass it before it is fed to the preceding drying zone.
  • the inventive machine for producing a fibrous web, in particular cardboard, paper or tissue web is characterized accordingly by the fact that for generating at least a portion of the steam for the preceding drying zone, a first heat exchanger is provided, the hot air, in particular exhaust air, from the Dehumidifier cylinder is supplied to the downstream drying zone associated hood in order to heat condensate and / or fresh water obtained by the hood removed hot air in the drying cylinder of the downstream drying zone.
  • At least part of the hot, humid air for the preceding drying zone is supplied by the hot air taken from the hood through the first heat exchanger to the preceding drying zone.
  • TAD Through Air Drying
  • the fibrous web is advantageously covered by at least one further permeable band, in particular press belt, wherein initially the Another permeable band or press belt, then the first permeable band or structural band and then the fibrous web are traversed by steam or hot, humid air.
  • a press belt a kind of belt press, in addition to the mechanical Pressure in particular a combined hot air and steam drying is applied.
  • a dewatering belt in particular felt belt, can be guided over the evacuated device or suction roll, first the further permeable belt or press belt, if present, then the first permeable belt or structural belt and the fibrous web and finally the additional belt Dewatering belt to be traversed by steam or hot, humid air.
  • the preceding drying zone may for example be fed directly by means of the first heat exchanger from the supplied condensate and / or fresh water produced steam.
  • the corresponding evaporation system can in particular also comprise one or more pumps for the circulation of the water.
  • these pumps in particular, it can be achieved that the water circulating within the first heat exchanger has an increased pressure, wherein this pressure can be in particular in a range from about 3 to about 20 bar.
  • the water absorbs heat from the air passing through the heat exchanger and is then relaxed.
  • the water pressure is reduced, whereby steam is generated.
  • the higher pressure water evaporates at a higher temperature. If the water is kept at a higher pressure, then its temperature can be increased without evaporation. If the pressure is then reduced to a value that has a boiling temperature below the previous temperature, the relaxation process begins automatically.
  • the steam generated can be deposited in a suitable chamber and used for the further drying process, in particular in tissue production.
  • a second heat exchanger is provided to heat fresh air through the hood removed hot air, wherein the thus heated fresh air of the drying cylinder of the downstream drying zone associated hood is supplied as combustion air and / or make-up air.
  • make-up air is understood as meaning, for example, air for preheating the drying zone and / or the drying system. Preheating is carried out, for example, when starting the tissue machine.
  • the present invention brings in particular advantages in terms of steam consumption and in particular when using a Yankee dryer and / or a belt press.
  • the amount of steam generated depends on such conditions as, in particular, air mass flow, air temperature and humidity, the fact of whether or not an air-to-air heat exchanger is provided, etc.
  • At least one heat exchanger is provided with a preferably flow-regulated bypass for the hot air removed from the hood.
  • Fig. 1 shows a schematic flow diagram of a first exemplary embodiment of the inventive heat recovery system of a machine for producing a fibrous web, which may be in particular a cardboard, paper or tissue web.
  • the moving fibrous web is first applied in the region of a preceding drying zone 10 with steam and hot, humid air. in the Connection therein, the fibrous web is fed to a downstream drying zone 12.
  • the preceding drying zone 10 may in particular comprise an evacuated device 42, preferably suction roll, over which the fibrous web is guided together with at least one permeable band, in particular structured band or TAD band, wherein first the permeable band and then the fibrous web of steam or hot, moist air to be flowed through.
  • an evacuated device 42 preferably suction roll
  • TAD band structured band or TAD band
  • the fibrous web can also be covered by at least one further permeable band, in particular press belt, in which case first the further permeable band or pressing band, then the first permeable band or structure band and subsequently the fibrous web of steam or hot, moist air be flowed through.
  • a press belt a kind of belt press, in which in addition to the mechanical pressure in particular the combined hot air and steam drying takes place.
  • a dewatering belt in particular felt belt, may also be guided via the evacuated device 42, first the further permeable belt or press belt, if present, then the first permeable belt or structural belt and the fibrous web and then the additional belt Dewatering belt to be traversed by steam or hot, humid air.
  • the downstream drying zone 12 may in particular comprise a drying cylinder 14, in particular Yankee cylinders, and a hood 16 associated therewith, which may in particular be a hot air hood.
  • the hood 16 associated with the drying cylinder 14 is removed hot air 18, in particular exhaust air.
  • condensate 22 and / or fresh water obtained by means of a first heat exchanger 20 in the drying cylinder 14 of the downstream drying zone 12 are heated by the hot air 18 taken from the hood 16.
  • the hot air 18 taken from the hood 16 and passed through the first heat exchanger 20 is fed to the preceding drying zone 10. Since the hot air 18 gives off heat to the condensate 22 or fresh water, its temperature is lowered, so that the moist hot air 18 'finally supplied to the preceding drying zone 10 has a temperature suitable for the specific drying in this drying zone 10.
  • the hot air supplied to the heat exchanger 20, 18 for example, a temperature in the range of 360 ° C and the last of the preceding drying zone 10 supplied moist hot air 18 'have a temperature in the range of 200 ° C.
  • the condensate 22 fed to the heat exchanger 20 may, for example, have a temperature in the region of 165 ° C.
  • steam 24 is generated directly from the supplied condensate 22 and / or fresh water by means of the first heat exchanger 20, which is then supplied to the preceding drying zone 10.
  • a steam separator 26 may be provided, which is arranged between the cylinder 14 and a pump 28, via which the heat exchanger 20, the condensate 22 is supplied. Moreover, in this Fig. 1 to recognize a steam generator 30.
  • the heat exchanger 20 is an air / water heat exchanger.
  • Fig. 2 shows a schematic flow diagram of another embodiment of the heat recovery system, which differs from the embodiment according to Fig. 1 essentially differs in that heated by means of a second heat exchanger 32 through the hood 16 removed hot air 18 fresh air 34 and the thus heated fresh air 34 'of the drying cylinder 14 of the downstream drying zone 12 associated hood 16 is supplied as combustion air.
  • the second heat exchanger 32 is thus an air / air heat exchanger.
  • the hot air 18 removed from the hood 16 is first passed through the second heat exchanger 32 provided for heating the fresh air 34 and then through the first heat exchanger 20 provided for heating the condensate 22 and fresh water before it is fed to the preceding drying zone 10.
  • the removed hot air 18 is first passed through the first heat exchanger 20 provided for heating the condensate 22 and / or fresh water and then through the second heat exchanger 32 provided for heating the fresh air 34 it is fed to the preceding drying zone 10.
  • this embodiment has at least substantially the same structure as that of Fig. 1 , wherein like reference numerals are assigned to corresponding parts.
  • Fig. 3 shows a schematic flow diagram of another embodiment of the heat recovery system, which differs from the embodiment according to Fig. 1 essentially differs in that the condensate 22 and / or fresh water is heated by the first heat exchanger 20 under elevated pressure, which is for example in a range of about 3 to about 20 bar, under elevated pressure and heated by means of this first heat exchanger 20, under elevated pressure condensate 22 and / or fresh water is subsequently fed to a flash evaporation device 36.
  • the steam 24 produced by flash flashing which has a lower pressure than heated condensate 22 or fresh water, is supplied to the preceding drying zone 10.
  • the heat exchanger 20 may be provided with a preferably flow-controllable bypass 38 for the hood 16 removed hot air 18. This gives greater flexibility with regard to the amount of steam generated for the preceding drying zone 10, preheating the combustion air (cf., for example Fig. 4 ) or even an increase in the temperature in the drying or hot air hood 40 associated with the preceding drying zone 10.
  • this embodiment can at least substantially the same structure as the embodiment according to Fig. 1 have, with corresponding parts corresponding reference numerals are assigned.
  • Fig. 4 shows a schematic flow diagram of another embodiment of the heat recovery system, which differs from the embodiment according to Fig. 3 essentially differs in that additionally heated by means of a second heat exchanger 32 through the hood 16 removed hot air 18 fresh air 34 and the thus heated fresh air 34 'of the drying cylinder 14 of the downstream drying zone 12 associated hood 16 is supplied as combustion air.
  • the removed hot air 18 is first passed through the first heat exchanger 20 provided for heating the condensate 22 and / or fresh water and then through the second heat exchanger 32 provided for heating the fresh air 34 before it is fed to the preceding drying zone 10.
  • the second heat exchanger 32 which is an air / air heat exchanger, may again be provided with a preferably flow-controllable bypass 38 for the hood 16 removed hot air 18.
  • this embodiment can at least substantially the same structure as the embodiment according to Fig. 3 have, with corresponding parts corresponding reference numerals are assigned.
  • Fig. 5 shows a schematic flow diagram of another embodiment of the heat recovery system, which differs from the embodiment according to Fig. 4 essentially differs in that the hot air 18 taken from the hood 16 is first passed through the second heat exchanger 32 provided for heating the fresh air 34, and then through the first heat exchanger 20 provided for heating the condensate 22 and / or fresh water, before the preceding one Drying zone 10 is supplied.
  • this embodiment at least substantially again the same structure as that according to Fig. 4 have, with corresponding parts corresponding reference numerals are assigned.
  • a concrete example is reproduced, which reproduces the potential for the steam generation according to the energy content of the exhaust air of the cylinder 14 of the downstream drying zone 12 associated hood or drying hood 16.
  • the generated steam can be used at least partially, in particular, in a steam blower box assigned to the preceding drying zone 10 or even in the Yankee troeper. It is assumed for example by a heat recovery system, as it is in the Fig. 3 is reproduced, in which only the first heat exchanger 20 is provided for heat recovery.
  • the steam generation potential in this example is 2020 kg / h of steam at a pressure of 3 bar.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
EP10701524.0A 2009-02-11 2010-01-27 Verfahren und vorrichtung zur trocknung einer faserstoffbahn Active EP2396468B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009000753A DE102009000753A1 (de) 2009-02-11 2009-02-11 Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
PCT/EP2010/050895 WO2010091950A1 (de) 2009-02-11 2010-01-27 Verfahren und vorrichtung zur trocknung einer faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2396468A1 EP2396468A1 (de) 2011-12-21
EP2396468B1 true EP2396468B1 (de) 2016-07-13

Family

ID=42102283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10701524.0A Active EP2396468B1 (de) 2009-02-11 2010-01-27 Verfahren und vorrichtung zur trocknung einer faserstoffbahn

Country Status (10)

Country Link
US (1) US9328460B2 (es)
EP (1) EP2396468B1 (es)
JP (1) JP2012517538A (es)
CN (1) CN102317540B (es)
CA (1) CA2752172A1 (es)
CL (1) CL2011001913A1 (es)
DE (1) DE102009000753A1 (es)
MX (1) MX2011007848A (es)
RU (1) RU2011134654A (es)
WO (1) WO2010091950A1 (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085821A1 (de) * 2011-06-20 2012-12-20 Voith Patent Gmbh Verfahren und System zur Wärmerückgewinnung für eine Trockenpartie einer Maschine zur Herstellung einer Materialbahn
DE102011077796A1 (de) * 2011-06-20 2012-12-20 Voith Patent Gmbh Verfahren und System zur Wärmerückgewinnung für eine Trockenpartie einer Maschine zur Herstellung einer Materialbahn
CN102720088A (zh) * 2012-06-08 2012-10-10 方汉佐 高速逆网多辊干燥特种造纸机的太阳能烘缸罩装置
CN104215059A (zh) * 2014-09-05 2014-12-17 广西壮族自治区特种设备监督检验院 一种烘缸经济器
CN106283816B (zh) * 2015-05-29 2020-04-10 金红叶纸业集团有限公司 干燥系统及其造纸方法
CN106283815B (zh) * 2015-05-29 2020-04-10 金红叶纸业集团有限公司 干燥系统及其造纸方法
DE102015219379A1 (de) * 2015-10-07 2017-04-13 Siemens Aktiengesellschaft Verfahren zum Betreiben einer Papiermaschine sowie Papiermaschine
CN108883575A (zh) * 2016-02-18 2018-11-23 维洛3D公司 准确的三维打印
US10612184B2 (en) * 2016-03-15 2020-04-07 The Research Foundation For Suny Hydronic drying machine
CN107881832A (zh) * 2017-11-03 2018-04-06 绥阳县双龙纸业有限公司 一种用于造纸的压榨装置
CN108486946B (zh) * 2018-05-14 2023-06-20 昆明纳太科技有限公司 整体式热汽烘缸及其应用于余热利用的系统

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
AT382176B (de) * 1984-02-10 1987-01-26 Andritz Ag Maschf Einrichtung an der trockenpartie von papiermaschinen
EP1079189A1 (de) * 1999-08-23 2001-02-28 Reinhard Weber Verfahren und Anordnung zur Energierückgewinnung
FI120366B (fi) 2002-03-19 2009-09-30 Metso Paper Inc Menetelmä ja laitteisto käyttövoiman tuottamiseksi paperi- tai kartonkilaitoksessa
CA2554365C (en) * 2004-01-30 2013-07-23 Thomas Thoroe Scherb Advanced dewatering system
US7351307B2 (en) 2004-01-30 2008-04-01 Voith Paper Patent Gmbh Method of dewatering a fibrous web with a press belt
DE102005029602A1 (de) * 2005-06-23 2007-01-04 Wiessner Gmbh Dunsthaube für Papier- und/oder Kartonmaschine
DE102006062235A1 (de) 2006-12-22 2008-06-26 Voith Patent Gmbh Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
DE102007006960A1 (de) * 2007-02-13 2008-08-14 Voith Patent Gmbh Vorrichtung zur Trocknung einer Faserstoffbahn
AT506077B1 (de) * 2008-01-29 2009-06-15 Andritz Ag Maschf Abwärmenutzung in der trockenpartie von papiermaschinen
AT505932B1 (de) * 2008-03-26 2009-05-15 Andritz Ag Maschf Vorrichtung und verfahren zur trocknung bewegter materialbahnen

Also Published As

Publication number Publication date
MX2011007848A (es) 2011-08-17
JP2012517538A (ja) 2012-08-02
CN102317540A (zh) 2012-01-11
CL2011001913A1 (es) 2012-01-20
CN102317540B (zh) 2014-12-03
RU2011134654A (ru) 2013-03-20
EP2396468A1 (de) 2011-12-21
CA2752172A1 (en) 2010-08-19
US20120000089A1 (en) 2012-01-05
WO2010091950A1 (de) 2010-08-19
US9328460B2 (en) 2016-05-03
DE102009000753A1 (de) 2010-08-12

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