EP3150761B1 - Machine pour la production ou le traitement d'une bande de matière fibreuse avec un cylindre chauffé à la vapeur et un dispositif pour alimenter le cylindre en vapeur, et méthode pour récupérer de la vapeur d'un cylindre chauffé à la vapeur d'une machine pour la production ou le traitement d'une bande de matière fibreuse - Google Patents

Machine pour la production ou le traitement d'une bande de matière fibreuse avec un cylindre chauffé à la vapeur et un dispositif pour alimenter le cylindre en vapeur, et méthode pour récupérer de la vapeur d'un cylindre chauffé à la vapeur d'une machine pour la production ou le traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP3150761B1
EP3150761B1 EP16190992.4A EP16190992A EP3150761B1 EP 3150761 B1 EP3150761 B1 EP 3150761B1 EP 16190992 A EP16190992 A EP 16190992A EP 3150761 B1 EP3150761 B1 EP 3150761B1
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EP
European Patent Office
Prior art keywords
steam
condensate
pressure level
pressure
heat exchanger
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EP16190992.4A
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German (de)
English (en)
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EP3150761A1 (fr
Inventor
Torben Schlieckau
Martin Dauner
Marco Popp
Thomas Mack
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • 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 machine for producing or processing a fibrous web according to the preamble of claim 1, as well as a method for vapor recovery of a steam consumer in the form of a steam-heated cylinder in a machine for producing or processing a fibrous web.
  • the Yankee cylinder uses a hot air hood to dry the web.
  • the hot exhaust air of this hood is usually used again for the production of steam.
  • Various methods are known from the prior art for this purpose.
  • thermocompressor is usually lower than the pressure level of the live steam network.
  • the inventive machine for producing or processing a fibrous web comprises a steam consumer in the form of a steam-heated cylinder, a live steam network which provides live steam at a first pressure level and a device for supplying the steam-heated cylinder.
  • the device comprises a steam supply, which provides steam at a second pressure level for the steam consumer, and which is connectable to the live steam network.
  • the device comprises a condensate return line for guiding the condensate removed from the steam consumer, in particular for return to an external steam generator, for example a power plant.
  • a steam generating device for at least partially evaporating the condensate removed from the steam consumer, which comprises at least one heat exchanger, and a return feed line, which is connectable to the steam supply to feed back steam generated from the condensate in the steam supply.
  • the steam supply can be decoupled from the live steam network by means of a valve or a throttling element and essentially consists of a line system without an additional storage container.
  • the second pressure level of the steam supply differs from the first pressure level of the live steam network.
  • this machine according to the invention has the significant advantage that the pressure level of the steam supply can be optimally adapted independently of the pressure level of the live steam network of the installation. Since the live steam network of the system next to the steam consumer of the device according to the invention, so next to the Yankee still supplies one or more other steam consumers, the pressure in this steam mains will be so high that all connected consumers can be adequately supplied. However, this first pressure level is usually higher than the pressure level which is necessary for the supply of the steam consumer and / or possible further units in the device according to the invention. In addition, the device according to the invention does without an additional vapor collection for the generated steam.
  • the device additionally comprises a thermocompressor for supplying the steam consumer.
  • This thermocompressor is connectable to the steam supply such that steam at the second pressure level can be used as motive steam.
  • the thermocompressor can be used to steam a low pressure levels - in particular flash steam, which is obtained by relaxing the condensate removed from the steam consumer by means of the driving steam to the pressure level at which the steam is introduced into the steam consumer.
  • steam is used in the steam consumer at a pressure of between 6 and 8.5 barg. The pressure can also be lower, eg at 3 barg or higher.
  • the inventive decoupling of live steam network and steam supply it is now possible to provide a second pressure level in the steam supply, which can be selected independently of the first pressure level, and which can be tailored specifically to the requirements of the steam consumer and if available the thermocompressor.
  • This second pressure level will usually differ from the first pressure level.
  • the second pressure level will be lower than the first pressure level.
  • the second pressure level is between 0.5 bar and 7 bar below the first pressure level, preferably between 2 bar and 4 bar below the first pressure level.
  • the pressure level required by the thermocompressor as motive steam is lower than the pressure level at which the steam comes from the steam generator, or as the first pressure level, which is maintained in the live steam network.
  • the second pressure level is adapted to the driving steam pressure of the thermocompressor, which is necessary to supply the steam consumer.
  • the second pressure level can be selected as the minimum pressure level required for the thermocompressor.
  • the steam generating device comprises in addition to a heat exchanger at least one throttle body to at least partially evaporate the condensate after passing through the at least one heat exchanger, and a separator (S2) to which the at least partially evaporated condensate can be fed, and to the the return feed line can be connected.
  • the at least partial evaporation of the condensate does not take place directly in the heat exchanger.
  • Such direct evaporation can optionally lead to the formation of deposits in the heat exchanger, which in turn can lead to a reduction in performance or damage to the heat exchanger.
  • the cost of feedwater treatment or condensate treatment can be higher.
  • the throttle body can be a valve, a diaphragm or a similar device which is suitable for at least partially evaporating the condensate after it has passed through the heat exchanger.
  • the condensate is vaporized directly at the inlet of the separator (S2) or in the interior of the separator (S2).
  • the separator (S2) has the function of a flash tank.
  • the separator and the throttle body form a functional unit.
  • the decoupling of the steam supply from the main steam network can be carried out in advantageous embodiments by means of a control or throttle valve.
  • the invention is not limited to these embodiments.
  • the connectivity of the two steam systems is advantageous. This can be used on the one hand for the initial filling of the steam supply and the steam consumer etc.
  • the steam from the first Pressure level of the fresh steam network to the second pressure level of the steam supply relaxed.
  • the required steam can also be supplied to the steam feed from the live steam network. In this case, a defined pressure level in the steam supply can be ensured by the valve or throttle member.
  • the device comprises a first pressure stage, which is designed to compress condensate from the condensate return line to a third pressure level.
  • This first pressure stage is generated in advantageous embodiments of the invention by a make-up pump.
  • This make-up pump can advantageously be designed so that it is suitable to bring the condensate to a pressure level of at least 20 barg, more preferably at least 25 barg.
  • the third pressure level will be higher in advantageous applications than the second pressure level. Often the third pressure level will be between 7.1 bar and 13 bar higher than the second pressure level. In particularly preferred embodiments, the third pressure level between 9 bar and 11 bar will be higher than the second pressure level. In this case, condensate can be removed from the condensate return line, which is brought by the make-up pump to the third pressure level.
  • the heat exchanger can be connected to the first pressure stage in such a way that the condensate is further heated at the third pressure level in the heat exchanger. This heated condensate can then be at least partially evaporated, for example.
  • the heat exchanger can be connected to an exhaust air line in such a way that the exhaust air can be used to heat the condensate.
  • the exhaust air line around the exhaust air line of a drying device of a machine for producing or processing a fibrous web may be the exhaust duct of the dryer hood of the steam consumer according to the invention.
  • it can be provided that it is the exhaust duct of any other aggregate, which is used in the production or processing of a fibrous web. In this case, however, in particular but not exclusively, the exhaust air line of a hot air or infrared drying of a coating system come into question.
  • At least one throttle device such as a fitting, a diaphragm or the like may be provided in the device to at least partially vaporize the condensate after passing through the heat exchanger.
  • the device comprises a separator to which the at least partially vaporized condensate can be fed, and to which the return feed line can be connected.
  • the condensate is vaporized directly at the inlet of the separator or in the interior of the separator.
  • the separator has the function of a flash tank.
  • the separator and the throttle body form a functional unit.
  • a device can be provided, with which the separator condensate are removed, and the heat exchanger can be supplied to the evaporation.
  • This device may in particular comprise suitable lines and a second pressure increasing device, which is suitable for compressing this condensate to the third pressure level.
  • condensate removed from the condensate return line can be combined with condensate, which is the separator is taken. From there, the condensate from the two sources can then be fed together to the heat exchanger.
  • the two condensate streams can be compressed independently of one another and brought to the third pressure level, for example. Then, at the merger, two condensate flows of the same pressure level can be mixed together.
  • the machine according to the invention comprises only a single steam consumer, which is connected to the steam supply.
  • the advantages of the decoupling of live steam network and steam supply according to the invention are particularly strong for carrying.
  • the steam supply is connected or connectable to two or more substantially identical steam consumers and / or two or more largely identical thermocompressors. Also in this case, the second pressure level can be optimally adjusted.
  • steps c) and d) are separated from each other.
  • the evaporation of the heated condensate is therefore not directly in the heat exchanger, but downstream, for example by means of a throttle body.
  • the feeding of the steam generated in the steam supply is advantageously carried out at the second pressure level.
  • the at least one heat exchanger for heating the condensate exhaust air of a drying device of a machine for producing or processing a fibrous web used in particular exhaust air of a drying hood of a drying cylinder or the exhaust duct of a hot air or infrared drying a coating unit.
  • thermocompressor be used to compress steam from a low pressure level so that it can be reintroduced into the steam consumer.
  • a pressure level between 6 barg and 8.5 barg is necessary in usual applications. In special applications, lower pressure levels (eg up to 3 barg) or possibly higher pressure levels may be necessary.
  • the values for the second pressure level and the third pressure level may vary depending on the application.
  • the second pressure level can, as already described above, for example, be adjusted by optimal adaptation to the requirement of the thermocompressor to increase the efficiency.
  • the pressure difference between the first pressure level and the second pressure level between 0.5 bar to 7 bar, in particular between 2 bar to 4 bar amount.
  • the pressure difference between the second pressure level and the third pressure level may advantageously be between 7.1 bar to 13 bar, in particular between 9 bar to 11 bar.
  • a separator may be provided before the generated steam is fed into the steam supply.
  • the steam generated is separated from the condensate.
  • the steam is fed from the separator into the steam supply in this embodiment.
  • the condensate is removed from this separator, compressed by means of a second pressure stage to the third pressure level, fed to the heat exchanger and then evaporated.
  • the condensate removed from the separator is combined with the condensate removed from the steam consumer at a junction and fed together to the heat exchanger, wherein no further pressure increase takes place between the junction and the heat exchanger (5).
  • FIG. 1 schematically shows an embodiment of the machine according to the invention.
  • the steam consumer 1 in FIG. 1 is exemplified as Yankee 1 executed.
  • an inlet 1a steam is introduced into the Yankee cylinder 1 for heating.
  • This vapor can have a pressure level between 6 and 8.5 barg. In special applications, lower pressure levels (eg up to 3 barg) or possibly higher pressure levels may be necessary.
  • an outlet 1b the Yankee cylinder 1 condensate can be removed. This condensate can be at a pressure level between 5 and 7.5 barg.
  • a first separator S1 steam is generated by expansion, which is returned by means of a line (12) back to the Yankee cylinder 1.
  • the resulting condensate is discharged from the first separator S1 via a condensate return line.
  • the motive steam required for this purpose relates to the thermocompressor from the steam feed 2.
  • the steam feed 2 provides steam at a second pressure level.
  • This second pressure level may advantageously be chosen to represent the minimum pressure level required by the thermocompressor 7 to sufficiently compress the vapor from the first separator S1.
  • This second pressure level is usually above the pressure at which the steam is fed into the steam consumer 1.
  • the required second pressure level is usually below the pressure level that provides the live steam network 10 of the system. Therefore, in the device according to the invention the steam supply 2 is decoupled from the live steam network 10.
  • This decoupling takes place in the embodiment in FIG. 1 by means of a valve 8, for example, a control or throttle valve 8.
  • the decoupling can also be done by a throttle body.
  • Essential to the decoupling is that in the steam supply 2 and the live steam network 10, the pressure can be set independently. As a rule, the second pressure level of the steam feed 2 is lower than the first pressure level of the live steam network 10.
  • condensate return line 3 condensate is removed, and brought by means of a first pressure stage 4 to a third pressure level.
  • This third pressure level can be, for example, 7.1 to 13 bar above the second pressure level, advantageously about 9 to 11 bar above the second pressure level.
  • the absolute values of the third pressure level can lie in advantageous embodiments between 20 barg and 30 barg, in particular between 22 barg and 27 barg. However, in individual cases, the values of the third pressure level may also deviate therefrom.
  • the condensate is heated further at the third pressure level.
  • the heat exchanger 5 can be operated, for example, with the exhaust air of the Yankee cylinder 1.
  • hot exhaust air which occur in the environment of the production or processing of the fibrous web. These may be, for example, exhaust air from the moisture-drying, gas turbine exhaust air or others.
  • From the heated condensate is in the in FIG. 1 shown execution by means of a throttle body 9 generates steam.
  • the steam is introduced via a return feed line 6 into the steam feed 2.
  • the injected steam is fed in substantially at the second pressure level. This again shows an advantage of the invention.
  • thermocompressor 7 Due to the decoupling of steam supply 2 and live steam network 10, the injected steam does not have to be produced at the (high) first pressure level, but can be generated at the (lower) second pressure level, which is usually chosen as the minimum pressure required for the operation of the thermocompressor 7 is necessary. Since the thermocompressor 7 requires more motive steam at a lower pressure level, more condensate can be evaporated and less is needed Condensate be returned to the steam generator 99, thereby increasing the efficiency of heat recovery.
  • the condensate accumulating in the second separator S2 can, as in FIG. 1 shown by way of example, brought by means of a second pressure stage 11 back to the third pressure level, and the heat exchanger 5 are supplied.
  • the condensate return line 3 removed condensate, which is brought by the pressure increasing means 4 - usually a pump to the third pressure level, and the separator S2 removed condensate before being introduced into the heat exchanger 5.
  • the merge 15 can advantageously be done before the heat exchanger 5.
  • the merging 15 is preferably carried out on the pressure side of the second pump 11, that is, after the condensate has been brought from the separator S2 to the third pressure level. In this very advantageous embodiment, therefore, there is no means for increasing the pressure of the condensate between the junction 15 and the heat exchanger 5.

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Claims (15)

  1. Machine pour la production ou le traitement d'une bande de matière fibreuse, comprenant un consommateur de vapeur (1) sous la forme d'un cylindre (1) chauffé à la vapeur, un réseau de vapeur vive (10), lequel fournit de la vapeur vive à un premier niveau de pression, et un dispositif servant à l'alimentation du cylindre (1) chauffé à la vapeur, comportant une alimentation en vapeur (2), laquelle fournit de la vapeur à un deuxième niveau de pression pour le consommateur de vapeur (1), et laquelle peut être reliée au réseau de vapeur vive (10),
    une conduite de recirculation de condensat (3) servant au guidage du condensat prélevé sur le consommateur de vapeur (1), en particulier à la recirculation dans un générateur de vapeur externe,
    un dispositif de génération de vapeur servant à l'évaporation au moins partielle du condensat prélevé sur le consommateur de vapeur (1), lequel dispositif de génération de vapeur comporte au moins un échangeur de chaleur (5), et
    une conduite de réinjection (6), laquelle peut être reliée à l'alimentation en vapeur (2) afin de réinjecter de la vapeur générée à partir du condensat dans l'alimentation en vapeur (2), l'alimentation en vapeur (2) pouvant être désaccouplée du réseau de vapeur vive au moyen d'une soupape (8) ou d'un organe d'étranglement, et
    le deuxième niveau de pression étant différent du premier niveau de pression,
    caractérisée en ce que
    l'alimentation en vapeur (2) est constituée sensiblement d'un système de conduites (2) sans contenant de stockage supplémentaire.
  2. Machine selon la revendication 1, caractérisée en ce que le dispositif comporte en outre un thermocompresseur (7) servant à l'alimentation du consommateur de vapeur (1), lequel thermocompresseur peut être relié à l'alimentation en vapeur (2) de telle sorte que de la vapeur au deuxième niveau de pression peut être utilisée comme vapeur motrice et que le deuxième niveau de pression est adapté à la pression de vapeur motrice du thermocompresseur (7).
  3. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de génération de vapeur comporte au moins un organe d'étranglement (9) afin d'évaporer au moins partiellement le condensat après le passage à travers l'échangeur de chaleur (5), ainsi qu'un séparateur (S2) auquel le condensat au moins partiellement évaporé peut être acheminé et auquel la conduite de réinjection (6) peut être raccordée.
  4. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le désaccouplement de l'alimentation en vapeur (2) du réseau de vapeur vive (10) s'effectue au moyen d'une soupape de régulation ou d'étranglement (8).
  5. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif comporte un premier moyen d'augmentation de pression (4), lequel est conçu pour comprimer du condensat provenant de la conduite de recirculation de condensat (3) à un troisième niveau de pression, et l'échangeur de chaleur (5) peut être relié au premier moyen d'augmentation de pression (4) de telle sorte que le condensat au troisième niveau de pression peut être acheminé à l'échangeur de chaleur (5) pour le réchauffement.
  6. Machine selon l'une quelconque des revendications 3 à 5, caractérisée en ce qu'un moyen est prévu, à l'aide duquel du condensat est prélevé sur le séparateur (S2), et peut être acheminé à l'échangeur de chaleur (5), et ce moyen comporte un deuxième moyen d'augmentation de pression (11) qui est approprié pour comprimer le condensat au troisième niveau de pression.
  7. Machine selon l'une quelconque des revendications 3 à 6, caractérisée en ce qu'une jonction (15) est prévue, dans laquelle le condensat prélevé sur la conduite de recirculation de condensat (3) est combiné avec du condensat qui est prélevé sur le séparateur (S2).
  8. Machine selon la revendication 7, caractérisée en ce qu'aucun autre moyen d'augmentation de pression n'est prévu entre la jonction (15) et l'échangeur de chaleur (5).
  9. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que l'échangeur de chaleur (5) peut être raccordé à une conduite d'air d'évacuation (13) de telle sorte que l'air d'évacuation peut être utilisé pour réchauffer le condensat.
  10. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que seulement un consommateur de vapeur unique (1) est relié à l'alimentation en vapeur (2).
  11. Procédé de récupération de vapeur d'un consommateur de vapeur sous la forme d'un cylindre (1) chauffé à la vapeur, dans une machine pour la production ou le traitement d'une bande de matière fibreuse, la machine comportant un réseau de vapeur vive (10), lequel fournit de la vapeur à un premier niveau de pression, et le cylindre (1) chauffé à la vapeur étant alimenté en vapeur à un deuxième niveau de pression à partir d'une alimentation en vapeur (2), cette alimentation en vapeur (2) étant constituée sensiblement d'un système de conduites (2) sans contenant de stockage supplémentaire et pouvant être désaccouplée du réseau de vapeur vive (10) au moyen d'une soupape (8) ou d'un organe d'étranglement, le procédé comportant les étapes suivantes :
    a) prélèvement de condensat sur le consommateur de vapeur (1),
    b) compression du condensat à un troisième niveau de pression,
    c) réchauffement du condensat au troisième de niveau de pression dans au moins un échangeur de chaleur (5),
    d) évaporation du condensat et génération de vapeur au deuxième niveau de pression,
    e) introduction de la vapeur générée dans l'alimentation en vapeur (2).
  12. Procédé selon la revendication 11, caractérisé en ce que la différence de pression entre le premier niveau de pression et le deuxième niveau de pression vaut entre 0,5 bar et 7 bars, en particulier entre 2 bars et 4 bars et/ou la différence de pression entre le deuxième niveau de pression et le troisième niveau de pression vaut entre 7,1 bars et 13 bars, en particulier entre 9 bars et 11 bars.
  13. Procédé selon l'une quelconque des revendications 11 et 12, caractérisé en ce qu'un séparateur (S2) est prévu après l'évaporation au moins partielle du condensat ou pour l'évaporation au moins partielle du condensat, avant que la vapeur générée ne soit introduite dans l'alimentation en vapeur (2).
  14. Procédé selon la revendication 13, caractérisé en ce que du condensat est prélevé sur le séparateur (S2), lequel condensat est comprimé au troisième niveau de pression et est acheminé à l'échangeur de chaleur (5).
  15. Procédé selon la revendication 13 ou 14, caractérisé en ce que du condensat prélevé sur le séparateur (S2) est combiné avec le condensat prélevé sur le consommateur de vapeur (1) au niveau d'une jonction (15) et est acheminé conjointement à l'échangeur de chaleur (5), plus aucune autre augmentation de pression n'ayant lieu entre la jonction (15) et l'échangeur de chaleur (5) .
EP16190992.4A 2015-09-29 2016-09-28 Machine pour la production ou le traitement d'une bande de matière fibreuse avec un cylindre chauffé à la vapeur et un dispositif pour alimenter le cylindre en vapeur, et méthode pour récupérer de la vapeur d'un cylindre chauffé à la vapeur d'une machine pour la production ou le traitement d'une bande de matière fibreuse Active EP3150761B1 (fr)

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DE102017126372A1 (de) 2017-11-10 2019-05-16 Voith Patent Gmbh Vorrichtung und Verfahren zur Trocknung einer Faserstoffbahn unter Verwendung einer Dampfrückgewinnung
DE102018107068A1 (de) 2018-03-26 2019-09-26 Voith Patent Gmbh Vorrichtung und Verfahren zur Trocknung einer Faserstoffbahn unter Verwendung einer Dampfrückgewinnung

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AT506077B1 (de) 2008-01-29 2009-06-15 Andritz Ag Maschf Abwärmenutzung in der trockenpartie von papiermaschinen
EP2396469B1 (fr) 2009-02-11 2012-12-12 Sca Hygiene Products AB Dispositif et procédé de séchage d'une bande continue de papier tissu par récupération de vapeur
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
EP2775030B1 (fr) 2013-03-06 2015-09-09 Valmet S.p.A. Dispositif de séchage d'une bande de papier mousseline et procédé de récupération de vapeur pendant le séchage d'une bande de papier tissu

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