WO2014180645A1 - 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 - Google Patents

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 Download PDF

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Publication number
WO2014180645A1
WO2014180645A1 PCT/EP2014/057861 EP2014057861W WO2014180645A1 WO 2014180645 A1 WO2014180645 A1 WO 2014180645A1 EP 2014057861 W EP2014057861 W EP 2014057861W WO 2014180645 A1 WO2014180645 A1 WO 2014180645A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating
steam
group
heating system
heating group
Prior art date
Application number
PCT/EP2014/057861
Other languages
German (de)
English (en)
Inventor
Martin Dauner
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
Priority claimed from DE102013208567.2A external-priority patent/DE102013208567A1/de
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to EP14718408.9A priority Critical patent/EP2994570B1/fr
Priority to CN201480026071.7A priority patent/CN105189865A/zh
Publication of WO2014180645A1 publication Critical patent/WO2014180645A1/fr

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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
    • D21F5/20—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 method for operating a heating system of a machine for producing or treating a fibrous web, in particular a paper or board web, wherein the heating system is designed as a cascade vapor system, which comprises at least a first and a second heating group and these each at least two with steam heated drying cylinders, wherein the first heating group is the one which comprises the first drying cylinder seen in the web running direction, and wherein a separator is present, which separates the residual steam from the condensate after flowing through the drying cylinders of the first heating group. Furthermore, the invention relates to such a heating system.
  • Heating systems with multiple heating groups and a separator are well known in the art.
  • the heating system is supplied with the Hauptmoredampf and fed directly into at least the heating group with the highest vapor pressure. After flowing through the drying cylinders of this heating group, the flow-through steam and the condensate are separated in a separator.
  • the flow-through steam is fed to a heating group with a lower vapor pressure and optionally also supplemented with steam from the main heating steam line.
  • the residual steam from the separator of the first heating group is condensed via a water-cooled condenser. The heat energy of the residual steam can not be used and is lost.
  • the object of the invention is to improve the operation and arrangement of such a heating system so that the energy consumption is reduced at the same heat output.
  • the object is achieved for the method in that a Thernnokonnpressor is present, which sucks the residual steam from the separator after the first heating group, this compresses with motive steam to the pressure level of the heating steam, which prevails before the first heating group, and this the first heating group fed again as heating steam, wherein the main heating steam of the heating system is used as motive steam.
  • thermocompressor is provided, which is designed so that it suck the residual steam from the separator after the first heating group, compress this with motive steam to the pressure level of the heating steam, which prevails before the first heating group and this can be supplied to the first heating group again as heating steam, wherein the motive steam line of the thermocompressor is connected to the Hauptchaindampf nie the heating system.
  • thermocompressor works on the principle of the steam jet pump.
  • thermocompressors per se as known in other applications, the prior art requires high pressure steam from a separate second steam network, e.g. at 13 bar abs or more. This is complex in the installation and expensive in operation.
  • the advantage of the invention is that the main heating steam of the heating system is used as motive steam for the thermocompressor. This eliminates the need for an additional second steam system to provide high pressure steam. Since the high-pressure steam is much more expensive than the normal Schofinddampf and in the case of cogeneration also power efficiency is lost, the design of the invention is not only in energy consumption of advantage, but also cheaper to operate. The heat energy of the residual steam of the first heating group can still be effectively used without the need for additional expensive high-pressure steam is necessary.
  • the pressure of Haupttogetherdampfes the maximum available pressure is referred to, with which the steam from the main steam line for heating the cylinder can be supplied to the heating system. Further advantageous features of the embodiment according to the invention can be found in the subclaims.
  • the invention can be used for heating systems that heat a pre-dryer section or a post-dryer section (after a surface application) or combined pre and post-dryer section.
  • the heating steam before the first heating group has a pressure of less than 3 bar abs, preferably less than 2 bar abs.
  • the HauptChdampf and thus the motive steam can have a pressure of at most 10 bar abs, preferably of at most 8 bar abs, more preferably of at most 4 bar abs.
  • the heating steam, which is supplied to the second heating group have a higher pressure than the heating steam, which is supplied to the first heating group.
  • the separator can be operated under reduced pressure with a pressure less than 1 bar abs.
  • the negative pressure in the separator can be generated substantially by the thermocompressor.
  • the steam supplied by the thermocompressor to the first heating group may advantageously constitute at least 20%, preferably at least 30% of the total heating steam supplied to the first heating group.
  • the first heating group is the one with the lowest heating steam pressure in the heating system.
  • the separator may advantageously be connected to a vacuum pump which discharges non-condensable gases from the heating system.
  • the first heating group comprises between 3 and 10 steam-heated drying cylinders.
  • the thermocompressor may be the only thermocompressor in the whole heating system.
  • FIG. 1 is a simplified schematic representation of the considered in the web running direction first heating group of a heating system according to the prior art
  • Figure 2 is a simplified schematic representation of the considered in the web running direction first heating group an exemplary embodiment of the heating system according to the invention
  • FIG 3 is a simplified schematic representation of the first heating group, viewed in the web running direction, of an exemplary embodiment of the heating system according to the invention applied to a thermocompressor system.
  • FIG. 1 shows a schematic representation of the first heating group 10 of a heating system according to the prior art viewed in the web running direction L.
  • the broth steam 12 is considered from the second heating stage or heating group 14, as viewed in the web running direction L, according to one of these associated or downstream separators 16 in the steam flow direction F considered subsequent first heating group 10 passed at a lower pressure level.
  • 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 completely condensed with cooling water 36.
  • 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 by 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 activated again via a pressure regulator 46, is used to set the operating parameter of a vacuum pump 50, wherein the operating parameter can be, for example, the pressure P v .
  • a speed control can be provided in the separator 32 in the separator 32 there is no stratification air / steam, since no air is sucked out.
  • 2 shows, in a simplified schematic representation, the first heating group 52, viewed in the web running direction L, of an exemplary embodiment of the heating system according to the invention.
  • the heating system is as a cascade steam system trained and used, for example, the treatment of a fibrous web, in particular a paper, cardboard or tissue web.
  • Such a cascade vapor system usually comprises at least two 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 heating stages 54, 56 each comprise only one drying cylinder 60 or 62, for example, while the third heating stage 58 in the present case includes two drying cylinders 64 and 66.
  • the first heating group 52 comprises a total of between three and ten steam-heated drying cylinders 60, 62, 64, 66.
  • 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 assigned or downstream separator 70.
  • thermocompressor 74 For thermal compression of the residual vapor steam 68, a thermocompressor 74 is provided according to the invention.
  • the residual-charge steam 68 in the thermocompressor 74 can be compressed, in particular, with live steam.
  • 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. However, the residual vapor 68 can also be compressed by compression to the pressure of the mixture vapor in the respective supply lines to the heating stages 56 and / or 54 and only this or in addition to these are supplied.
  • 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 may generally increase in the web running direction L.
  • the flow direction F of the heating steam is correspondingly opposite to the web running direction L when heating groups are connected in series.
  • 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 method applied to a thermocompressor system heating system according to the invention, in which steam of a heating group is completely recirculated.
  • this first heating group 52 again comprises, for example, three heating stages 54-58.
  • a thermocompressor 74 is provided according to the invention.
  • the required air extraction for example, again to the condenser 86 and / or via the 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.
  • thermocompressor 74 which sucks the residual steam from the separator 70 after the first heating group 10, this with motive steam to the pressure level of the heating steam 20, which prevails before the first heating group 10 , Compressed and this the first heating group 10 again as heating steam 20 supplies, being used as the driving steam Hauptchaindampf the heating system.
  • the thermocompressor 74 according to the invention is the only thermocompressor in the entire heating system.
  • the heating steam 20 has before the first heating group a pressure of less than 3 bar abs, preferably less than 2 bar abs, while the HauptChdampf and thus the motive steam, a pressure of 10 bar abs, preferably at most 8 bar abs, particularly preferably of not more than 4 bar abs.
  • a pressure of 10 bar abs preferably at most 8 bar abs, particularly preferably of not more than 4 bar abs.
  • the separator 70 is connected to a vacuum pump which discharges non-condensable gases from the heating system.
  • the separator 70 is operated under reduced pressure with a pressure of less than 1 bar abs, the negative pressure in the separator 70 being generated essentially by the thermocompressor 74.
  • the steam supplied by the thermocompressor 74 to the first heating group 10 amounts to at least 20%, preferably at least 30%, of the total heating steam supplied to the first heating group 10.
  • the first heating group 10 is the one with the lowest heating steam pressure in the heating system.

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

Abstract

L'invention concerne un système de chauffage d'une machine de production ou de traitement d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton, ainsi qu'un procédé permettant de faire fonctionner un système de ce type. Le système de chauffage comprend au moins un premier et un deuxième groupe de chauffage dont chacun comprend au moins deux cylindres de séchage (60-66) chauffés à la vapeur. Le premier groupe de chauffage (52) est celui qui comprend les premiers cylindres de séchage (60-66) vu dans le sens d'avance de la bande. Le système comprend un séparateur (70) qui sépare la vapeur résiduelle du condensat après la traversée du cylindre de séchage (60-66) des premiers groupes de chauffage (52), et un thermocompresseur (74) qui aspire la vapeur résiduelle après le premier groupe de chauffage (52), la comprime au moyen de vapeur vive au niveau de pression qui règne en amont du premier groupe de chauffage (52), et la retourne au premier groupe de chauffage (52) sous forme de vapeur de chauffage. La vapeur vive présente une pression qui n'est pas supérieure à la pression de la vapeur de chauffage principale du système de chauffage.
PCT/EP2014/057861 2013-05-08 2014-04-17 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 WO2014180645A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14718408.9A EP2994570B1 (fr) 2013-05-08 2014-04-17 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
CN201480026071.7A CN105189865A (zh) 2013-05-08 2014-04-17 用于运行制造或处理纤维料幅的机器的干燥部的加热系统的方法和加热系统

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102013208567.2 2013-05-08
DE102013208567.2A DE102013208567A1 (de) 2013-05-08 2013-05-08 Heizsystem für eine Trockenpartie einer Maschine zur Herstellung oder Behandlung einer Faserstoffbahn
DE102013225828.3 2013-12-13
DE102013225828 2013-12-13

Publications (1)

Publication Number Publication Date
WO2014180645A1 true WO2014180645A1 (fr) 2014-11-13

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PCT/EP2014/057861 WO2014180645A1 (fr) 2013-05-08 2014-04-17 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

Country Status (3)

Country Link
EP (1) EP2994570B1 (fr)
CN (1) CN105189865A (fr)
WO (1) WO2014180645A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016125172A1 (de) 2016-12-21 2018-06-21 Voith Patent Gmbh Verfahren zum Betrieb eines Heizgruppenteilsystems und Heizgruppenteilsystem

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008000227A1 (de) * 2008-02-04 2009-08-06 Voith Patent Gmbh Vorrichtung zur Versorgung von mindestens einer Heizgruppe einer Einrichtung zur Herstellung von Faserstoffbahnen
DE102008041860A1 (de) * 2008-09-08 2010-03-11 Voith Patent Gmbh Heizsystem zur Behandlung einer Faserstoffbahn

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008000227A1 (de) * 2008-02-04 2009-08-06 Voith Patent Gmbh Vorrichtung zur Versorgung von mindestens einer Heizgruppe einer Einrichtung zur Herstellung von Faserstoffbahnen
DE102008041860A1 (de) * 2008-09-08 2010-03-11 Voith Patent Gmbh Heizsystem zur Behandlung einer Faserstoffbahn

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016125172A1 (de) 2016-12-21 2018-06-21 Voith Patent Gmbh Verfahren zum Betrieb eines Heizgruppenteilsystems und Heizgruppenteilsystem
CN108221450A (zh) * 2016-12-21 2018-06-29 福伊特专利有限公司 用于运行加热组子系统的方法和加热组子系统
EP3339507B1 (fr) 2016-12-21 2019-04-17 Voith Patent GmbH Procédé de fonctionnement d'un sous-système de groupes de chauffage et sous-système de groupes de chauffage
US10533284B2 (en) 2016-12-21 2020-01-14 Voith Patent Gmbh Method for operation of a heating group subsystem, and heating group subsystem

Also Published As

Publication number Publication date
CN105189865A (zh) 2015-12-23
EP2994570B1 (fr) 2017-10-25
EP2994570A1 (fr) 2016-03-16

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