EP2329077A1 - Système de chauffage destiné au traitement d'une bande de matière fibreuse - Google Patents

Système de chauffage destiné au traitement d'une bande de matière fibreuse

Info

Publication number
EP2329077A1
EP2329077A1 EP09781157A EP09781157A EP2329077A1 EP 2329077 A1 EP2329077 A1 EP 2329077A1 EP 09781157 A EP09781157 A EP 09781157A EP 09781157 A EP09781157 A EP 09781157A EP 2329077 A1 EP2329077 A1 EP 2329077A1
Authority
EP
European Patent Office
Prior art keywords
heating
steam
group
heating system
stage
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.)
Withdrawn
Application number
EP09781157A
Other languages
German (de)
English (en)
Inventor
Martin Dauner
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 EP2329077A1 publication Critical patent/EP2329077A1/fr
Withdrawn legal-status Critical Current

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
    • D21F5/20—Waste heat recovery
    • 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
    • D21F5/022—Heating the cylinders
    • D21F5/028—Heating the cylinders using steam
    • 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
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention relates to a heating system for treating a fibrous web, in particular paper, board or tissue web, with one or more heating groups, each comprising one or more heating stages, each containing one or more steam-heated drying cylinders. It also relates to a machine for producing and / or treating a fibrous web, in particular paper, board or tissue web, with one or more dry sections, each of which comprises one or more such heating systems.
  • One or more heating systems of this kind may for example be associated with the dryer section of a paper and / or coater.
  • 1 shows a schematic representation of the first heating group 10 of a conventional heating system viewed in the web running direction L.
  • the broth steam 12 from the second heating stage or group 14, viewed in the direction of web travel L is directed to the first heating group 10 at a lower pressure level, which is associated with or arranged downstream of the latter in the vapor flow direction F.
  • Mixture with live steam 18 produces mixed steam (heating steam) 20, which is used to heat the drying cylinder (s) 22-30 of the first heating group 10 viewed in the web running direction L.
  • first heating group 10 which is the last group in the heating system
  • the Restbrüdendampf 33 from one of the first heating group 10 associated or downstream separator 32 is passed into a vapor condenser 34 and with cooling water. completely condensed. The condensate is subsequently returned to the separator 32 assigned to the first heating group 10.
  • steam and condensate from the second heating group 14 are fed to the separator 16 assigned or connected downstream of the second heating group 14. Condensate from the two separators 16 and 32 is discharged into a condensate collection tank.
  • the first heating group 10 associated or downstream separator 32 is supplied via a line 38, steam, condensate and air, for example, leakage air to flanges.
  • the residual vapor 33 coming from the separator 32 and supplied to the vapor condenser 34 may contain an air / vapor mixture.
  • the drying cylinders 22 - 28 are acted upon by control valves 42 with pneumatic control with mixed steam 20, which are each controlled via a pressure regulator 44.
  • an air separator 40 is provided between the vapor condenser 34 and the separator 32.
  • a pressure control valve 48 with pneumatic control which can be controlled again via a pressure regulator 46, serves to set the operating parameter of a vacuum pump 50, wherein the operating parameter may be, for example, the pressure Pv. Alternatively, a speed control can be provided.
  • the separator 32 there is no stratification air / steam, since no air is sucked out.
  • a disadvantage of such known heating systems is that the residual steam is no longer used.
  • the energy contained therein is transferred in the vapor condenser 34 to the cooling water 36 and is thus lost. Heat energy in the steam is no longer used economically. This results in a relatively high consumption of cooling water.
  • the invention has for its object to provide an improved heating system of the type mentioned, in which the heat energy in the residual steam used economically and correspondingly less live steam is needed.
  • the residual vapor is expediently removed from one of the last heating stage or group assigned or downstream separator.
  • a steam jet pump is provided for compressing the residual steam, the residual steam in the steam jet pump preferably being compressed with live steam.
  • a mechanical compressor may alternatively be provided in particular.
  • the drying cylinder (s) of the last heating stage or group can be heated with mixed steam, the residual broth steam passing through Compression is compressed to the pressure of the mixture vapor and assigned to this.
  • vacuum pumps are provided for discharging non-condensable gases which penetrate into the heating system under vacuum from the separator assigned to the last heating stage.
  • the temperature of the drying cylinder generally increases in the web running direction.
  • the heating system is in particular also designed so that in each heating stage of a heating group pressure is reduced and according to the flow direction of the heating steam is opposite to the web running direction. This applies in particular to heating groups connected in series.
  • the heating system can advantageously be designed so that steam of a respective heating group or stage is completely recirculated in the manner of a thermocompressor system.
  • the heating system is designed such that, in the manner of a cascade system, steam of a respective preceding heating group or stage is used in a respective subsequent heating group or stage.
  • the vapor pressure level of a subsequent heating group or stage is lower than that of respective preceding heating group or stage.
  • these heating groups or stages do not necessarily have to be next to each other spatially.
  • the heating steam can be passed, for example, from the fourth heating group directly into the first heating group. This may be useful in this example if the temperature in the second and third heating group is higher than that in the fourth heating group and the temperature of the first heating group is lower than that in the fourth heating group.
  • Means are preferably provided to produce by mixing the Brüdendampfes from the penultimate heating stage or group of the heating system with live steam mixture steam (heating steam) for heating the last heating stage or group.
  • the machine according to the invention for producing and / or treating a fibrous web, in particular a paper, board or tissue web, is characterized in that it comprises one or more dry sections, each comprising one or more heating systems according to the invention.
  • At least one drying section is provided, each with only one heating system according to the invention.
  • all dry sections can each have only one such heating system according to the invention.
  • At least one drying section is provided with a plurality of independent heating systems according to the invention. It is thus possible for the residual-charge steam, which remains after the first heating stage or group at the beginning of the respective drying section in the drying process, to be compressed by means of, for example, a jet pump or a mechanical compressor and fed back into the system, whereby its thermal energy is utilized. which leads to the reduction of the live steam demand.
  • the residual vapor can be compressed by compression to the pressure of the mixture vapor.
  • the missing live steam can be supplied.
  • the non-condensable gases which penetrate into the system under vacuum can be continuously removed from the separator assigned to the first heating stage or arranged downstream by means of the vacuum pumps.
  • the heating system according to the invention and the machine according to the invention thus bring, inter alia, the advantage that the consumption of live steam is reduced by the use of the residual steam of the family, which entails a corresponding reduction of the energy costs.
  • the cooling water consumption is reduced.
  • the invention can be used, for example, in the dry sections of a paper and / or coater, which can comprise, for example, a pre-blank section, a surface finishing station comprising, for example, a size press and / or a coater, a post-dryer section, a coater, and a further after-dryer section.
  • the invention is applicable, for example, to a thermocompressor system or to a cascade system.
  • the heating system is used Heating the drying cylinders with steam. It may comprise one or more heating groups, each of which may have one or more heating stages. A respective heating stage may comprise one or more drying cylinders.
  • a drying section, for example pre-drying section or after-dryer section may comprise one or more heating systems according to the invention.
  • the dry sections each comprise exactly one heating system according to the invention.
  • the temperature of the drying cylinder increases substantially in the web running direction. Consequently, the flow direction of the heating steam is opposite to the web running direction, since pressure is reduced in each heating stage.
  • Fig. 1 is a simplified schematic representation of in
  • Web running direction regards first heating group of a conventional heating system
  • Fig. 2 is a simplified schematic representation of in
  • FIG. 3 is a simplified schematic representation of in
  • Fig. 4 is a simplified schematic representation of in
  • FIG. 5 shows a simplified schematic representation of a paper and / or coating machine with a pre-drying section, a surface finishing station comprising, for example, a size press and / or a coating unit, a post-dryer section, a coating unit and a further after-dryer section.
  • the heating system is used for example for the treatment of a fibrous web, in particular paper, board or tissue web and comprises one or more heating groups, each comprising one or more heating stages, each containing one or more steam-heated drying cylinders.
  • the first heating group 52 comprises, for example, three heating stages 54-58.
  • the first two comprise the first Heating stages 54, 56, for example, only one drying cylinder 60 and 62, while the third heating stage 58 in the present case, for example, two drying cylinders 64 and 66 includes.
  • Means are provided for compressing the residual vapor steam 68 remaining after the last heating stage or group 52 of the heating system, viewed in the flow direction F of the steam or heating steam, and returning it to the heating system.
  • the residual vapor steam 68 is removed from one of the last heating stage or group 52 associated or downstream separator 70.
  • a steam jet pump 72 may be provided for the thermal compression of the residual vapor steam 68.
  • the residual steam 78 can be compressed in the steam jet pump 72, in particular with live steam.
  • a mechanical compressor 74 may also be provided for compressing the residual-charge steam 68.
  • the drying cylinder (s) 60 - 66 of the last heating stage or group 52 can be heated with mixed steam 76.
  • the residual vapor steam 68 can be compressed by compression to the pressure of the mixture vapor 76 and supplied thereto.
  • the Restbrüdendampf (68) can also by compression on the
  • Non-condensable gases entering the vacuum heating system can optionally be removed via one or more vacuum pumps 78 from the separator 70 assigned to the last heating stage or group 52.
  • the temperature of the drying cylinders 60 - 66, 80 in the web running direction L can generally increase.
  • the required extraction of air may, for example, take place to a condenser 86 and / or via a line 88 leading to the vacuum pump or pumps 78. Between the condenser 86 and the separator 70, an air separator 87 may be provided.
  • FIG. 3 shows, in a simplified schematic representation, a first heating group 52, viewed in the direction of web travel L, of a comparable exemplary embodiment of the thermal compressor system. used inventive heating system in which steam of a heating group is fully recirculated.
  • this first heating group 52 again comprises, for example, three heating stages 54-58.
  • a steam jet pump 72 or a mechanical compressor 74 can again be provided.
  • the required air extraction can, for example, be made again to the condenser 86 and / or via the line 88 leading to the vacuum pump or pumps 78. Between the condenser 86 and the separator 70, an air separator 87 may again be provided.
  • FIG. 4 shows, in a simplified schematic representation, the first heating group 52, viewed in the web running direction L, of a comparable exemplary embodiment of the heating system applied to a cascade system according to the invention.
  • the first heating group 52 again comprises three heating stages 54-58.
  • a steam-jet pump 72 or a mechanical compressor 74 can again be provided in the present case.
  • the required air extraction for example, again to a condenser 86 and / or via a line 88, which leads to the one or more vacuum pumps 78. Between the condenser 86 and the separator 70, an air separator 87 may again be provided. On the right side of Fig. 4, the remaining in the first heating group 52 in the other elements are further specified.
  • the residual-charge steam 68 can in each case be compressed again by compression to the pressure of the mixed steam 76 and supplied thereto.
  • the residual-charge steam 68 can also be compressed by compression to the pressure of the mixture steam in the respective supply lines to the heating stages 56 and / or 54 and supplied thereto only or additionally thereto.
  • FIG. 5 shows, in a simplified schematic representation, a paper and / or coater 90 with a pre-drying section 92, as seen in the web running direction L, a surface finishing station 94, for example a size press and / or a coater, a post-dryer section 96, a coater 98 and another night dryer section 100.
  • the pre-drying section 92 comprises, for example, four heating groups, the after-dryer section 96, for example two heating groups, and the further after-drying section 100, for example a heating group.
  • the first heating group (heating group 1) can have three heating stages (HS1 .1-HS1.3)
  • the second heating group (heating group 2) can have two heating levels (HS2.1, HS2.2)
  • the third heating level group (heating group 3) for example, two heating levels (HS3.1, HS3.2)
  • the fourth heating group (heating group 4) for example, a heating level (HS4.1)
  • the night dryer section 96 associated fifth heating group (heating group 5) for example, three heating levels (HS5 .1 - HS5.3)
  • the sixth heating group (heating group 6) also assigned to the after-dryer section 96, for example two heating stages (HS6.1, HS6.2)
  • the seventh heating group (heating group 7) assigned to the further after-dryer section 100 for example three heating stages (HS7.1 -
  • one or more of the drying sections formed by the pre-drying section 92 and the after-drying sections 96, 100 can each be assigned one or more heating systems according to the invention, the respective drying sections preferably being provided in each case only with such a heating system according to the invention.
  • the vapor pressure in the pre-drying section 92 in the web running direction L initially rises generally from the first drying stage HS1 .1 to the next-to-last drying stage HS3.2, whereas it starts from the penultimate drying stage HS3. 2 until the last dry stage HS4.1 falls again slightly.
  • the heating group 1 is followed by a lower pressure and temperature level.
  • the vapor pressure generally increases from the first drying stage HS5.1 to the last drying stage HS6.2. The same applies to the vapor pressure curve in the after-dryer section 100.
  • the dry content of the paper web within a respective drying section decreases from 92 to 100 the first drying stage continuously up to the last drying stage.
  • the drying cylinders are each designated 80.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention concerne un système de chauffage destiné au traitement d'une bande de matière fibreuse, en particulier d'une bande de papier, de carton ou de tissu, comprenant un ou plusieurs groupes de chauffage qui comprennent respectivement un ou plusieurs étages de chauffage (54-58) contenant eux-mêmes respectivement un ou plusieurs cylindres de séchage (60-66, 80) chauffés par de la vapeur. Selon l'invention, des moyens (72, 74) sont utilisés pour comprimer et réintroduire dans le système de chauffage les vapeurs chaudes résiduelles qui subsistent après le passage par le dernier étage de chauffage ou groupe de chauffage du système de chauffage, lorsque l'on considère le sens de circulation de la vapeur.
EP09781157A 2008-09-08 2009-07-28 Système de chauffage destiné au traitement d'une bande de matière fibreuse Withdrawn EP2329077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810041860 DE102008041860A1 (de) 2008-09-08 2008-09-08 Heizsystem zur Behandlung einer Faserstoffbahn
PCT/EP2009/059703 WO2010025999A1 (fr) 2008-09-08 2009-07-28 Système de chauffage destiné au traitement d'une bande de matière fibreuse

Publications (1)

Publication Number Publication Date
EP2329077A1 true EP2329077A1 (fr) 2011-06-08

Family

ID=41165549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09781157A Withdrawn EP2329077A1 (fr) 2008-09-08 2009-07-28 Système de chauffage destiné au traitement d'une bande de matière fibreuse

Country Status (4)

Country Link
EP (1) EP2329077A1 (fr)
CN (1) CN102149871A (fr)
DE (1) DE102008041860A1 (fr)
WO (1) WO2010025999A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010096012A1 (fr) * 2009-02-20 2010-08-26 Stora Enso Ab Processus et dispositif pour augmenter la capacité de séchage
DE102010041231A1 (de) * 2010-05-19 2011-11-24 Voith Patent Gmbh Verfahren und Vorrichtung zum Verfahren zur Wärmerückgewinnung für eine Trockenpartie einer Maschine zur Herstellung einer Faserstoffbahn
FI122648B (fi) 2010-12-16 2012-05-15 Metso Paper Inc Menetelmä ja järjestely jäännöshöyryn käsittelemiseksi kuiturainakoneen höyry- ja lauhdejärjestelmässä
DE102011075477A1 (de) * 2011-05-09 2012-11-15 Voith Patent Gmbh Verfahren zur Wärmerückgewinnung für eine Trockenpartie einer Maschine zur Herstellung einer Materialbahn und Trockenpartie
CN102787526A (zh) * 2012-07-09 2012-11-21 李永华 基于尾汽流量控制及热泵技术的生活用纸单缸纸机
CN102776800A (zh) * 2012-07-13 2012-11-14 成都依瑞克科技有限公司 无风干燥机
EP2994570B1 (fr) * 2013-05-08 2017-10-25 Voith Patent GmbH Procédé permettant de faire fonctionner un système de chauffage d'une partie séchage d'une machine de production ou de traitement d'une bande de matière fibreuse, et système de chauffage
CN105926341B (zh) * 2016-04-27 2017-08-29 陕西科技大学 一种卫生纸机干燥部能耗协同装置及其控制系统
DE102016125172A1 (de) 2016-12-21 2018-06-21 Voith Patent Gmbh Verfahren zum Betrieb eines Heizgruppenteilsystems und Heizgruppenteilsystem
DE102017126372A1 (de) * 2017-11-10 2019-05-16 Voith Patent Gmbh Vorrichtung und Verfahren zur Trocknung einer Faserstoffbahn unter Verwendung einer Dampfrückgewinnung
CN109440518B (zh) * 2018-09-29 2020-12-11 中国科学院理化技术研究所 一种基于mvr的造纸干燥系统

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Publication number Priority date Publication date Assignee Title
US2992493A (en) * 1958-04-16 1961-07-18 Worthington Corp Method and apparatus for controlling and limiting the quantity of "blowthru" steam in a drying system
US4447964A (en) * 1981-11-23 1984-05-15 Gardner Thomas A Dryer drainage by recirculation with primary and secondary dryers
AT382176B (de) * 1984-02-10 1987-01-26 Andritz Ag Maschf Einrichtung an der trockenpartie von papiermaschinen

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
WO2010025999A1 (fr) 2010-03-11
CN102149871A (zh) 2011-08-10
DE102008041860A1 (de) 2010-03-11

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