EP2546412B1 - Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn - Google Patents

Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn Download PDF

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Publication number
EP2546412B1
EP2546412B1 EP20110174191 EP11174191A EP2546412B1 EP 2546412 B1 EP2546412 B1 EP 2546412B1 EP 20110174191 EP20110174191 EP 20110174191 EP 11174191 A EP11174191 A EP 11174191A EP 2546412 B1 EP2546412 B1 EP 2546412B1
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EP
European Patent Office
Prior art keywords
secondary heating
medium
belt
processing apparatus
heating cycle
Prior art date
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Not-in-force
Application number
EP20110174191
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English (en)
French (fr)
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EP2546412A1 (de
Inventor
Reijo PIETIKÄINEN
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Valmet Technologies Oy
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Valmet Technologies Oy
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Publication date
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Priority to EP20110174191 priority Critical patent/EP2546412B1/de
Publication of EP2546412A1 publication Critical patent/EP2546412A1/de
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Publication of EP2546412B1 publication Critical patent/EP2546412B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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
    • D21F5/027—Heating the cylinders using a heat-transfer fluid between the heating means and the cylinder shell
    • 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

Definitions

  • the present invention relates to a processing apparatus for use in a pressing, drying and/or finishing section of a fibrous-web treatment machine according to the preamble of claim 1, said apparatus comprising a heating device for heating a belt of the processing apparatus.
  • heating of a member (e.g. a metal belt) of a processing apparatus in a pressing, drying and/or finishing section of a fibrous-web treatment machine is done by an induction heater, an infrared radiator, a gas burner, or a capacitive heater.
  • an induction heater e.g. a heating coil
  • an infrared radiator e.g. a heating coil
  • a gas burner e.g. a gas burner
  • capacitive heater e.g. a capacitive heater
  • Heating by means of an induction heater, an infrared radiator, a gas burner or a capacitive heater is generally less efficient than heating means using heat exchange.
  • devices and methods for heating members (e.g. rolls, belts, metal belts, cylinders, etc.) of a processing apparatus in a pressing, drying and/or finishing section of a fibrous-web treatment machine by means of steam are generally known (e.g. so-called CondeBelt drying devices/methods provided by the applicant).
  • a heating cycle in which steam generated by a power unit which is arranged in a fibrous web mill (such as paper, tissue or cardboard) is passed to get into contact with a surface of a member to be heated (e.g. a metal belt). At least a part of the steam condenses at said surface of the member to be heated and, thus, a specific amount of heat is transferred to the member so that it temperature rises (the member is heated). The steam condensate is recovered and returned to the power unit.
  • a steam low-pressure steam
  • a problem of this technology is that by condensing of steam directly on a process surface (i.e. fibrous-web contacting metal belt or roll surface) impurities (fibres, sticky materials, etc.) are transferred from the process surface to the condensate.
  • impurities for example, dirt, dirt, etc.
  • the condensate may become contaminated and acidified causing corrosion and other disadvantages in the steam heating cycle system.
  • WO 97/39183 A1 shows a processing apparatus according to the preamble of claim 1 comprising a heating device for heating a belt of the processing apparatus.
  • Each of EP 0 349 202 A2 , WO 97/39184 A1 and WO 97/39186 A1 shows a processing apparatus comprising a heating device according to the prior art for heating a belt member of the processing apparatus for treating a fibrous web.
  • It is an object of the present invention to further develop a processing apparatus comprising a heating device for heating a belt of the processing apparatus such that a degree of contamination of a heating medium can be lowered.
  • the object of the present invention is achieved by a processing apparatus comprising a heating device having the features of claim 1.
  • a processing apparatus comprising a heating device for heating a belt of the processing apparatus in a pressing, drying and/or finishing section of a fibrous-web treatment machine.
  • the device comprises a primary heating cycle in which a primary heating medium is passed, a secondary heating cycle for heating the belt of the processing apparatus in which a secondary heating medium is circulated, and an indirect heat exchanging means for exchanging heat between the primary heating medium and the secondary heating medium, wherein an amount of heat of the primary heating medium passing in the primary heating cycle is transferred to the secondary heating medium circulating in the secondary heating cycle by means of the indirect heat exchanging means so that the belt of the processing apparatus is heatable by the secondary heating medium.
  • a heating cycle is divided into different cycles. That is, a primary heating cycle in which a primary heating medium is passed and a secondary heating cycle in which a secondary heating medium is passed are provided such that these cycles are structurally separated from each other. Since the cycles are separated from each other, process impurities of a fibrous-web such as fibres, sticky materials, etc. stay (circulate) in the secondary heating medium within the secondary heating cycle and cannot enter the primary heating cycle since the amount of heat of the primary heating medium passing in the primary heating cycle is transferred to the secondary heating medium circulating in the secondary heating cycle by means of the indirect heat exchanging means (i.e. without direct contact of the heating mediums).
  • the secondary heating cycle comprises a medium chamber in which the secondary heating medium is in direct contact with the member to be heated.
  • a sealing means may be provided at edges of the medium chamber in order to avoid leakage of the secondary heating medium to surroundings of the secondary heating cycle.
  • Such a sealing means may be a pressure-operated sealing member, i.e. a sealing operating pressure is adjusted in accordance with pressure acting in the medium chamber.
  • the sealing member is adapted to act in accordance with a pressure of the secondary heating medium in the medium chamber.
  • the secondary heating medium in the medium chamber cooperates with the belt to be heated, i.e. directly contacts the belt to be heated.
  • a predetermined medium pressure is maintained by the pressure in the chamber. Consequently, the structure of the whole device including the medium chamber is simplified because no further means for sealing are required.
  • the secondary heating medium directly contacts a surface of the belt to be heated in order to transfer the amount of heat from the secondary heating medium to the belt by condensing of the secondary heating medium along said surface. Since heating occurs at such a process surface of the belt, this provides an effective heat transfer, i.e. heat amount is directly brought to where it is required. That is, since no structural elements are arranged between the belt and the secondary heating medium, heat transfer resistances are avoided, loss of heat is minimized and thermal stresses related to it are reduced.
  • the structure for transferring heat from the secondary heating medium to the belt to be heated is thus simple.
  • the processing apparatus comprises the heating device and the belt to be heated by the heating device, wherein the belt is impervious to fluids, forms an endless loop and guides a fibrous web.
  • the low- or medium-pressure primary heating medium may be further conveyed (passed) after passing through the heat exchanging means to a further process stage to another member to be heated (e.g. a drying cylinder or the like) where it is finally condensed.
  • thermal efficiency is further improved.
  • the primary heating cycle may be a power unit cycle (i.e. main steam cycle) of a fibrous web mill. Further, the installation size of the secondary heating cycle is small compared to that of the primary heating cycle. Thus, the amount of the secondary heating cycle circulating in the secondary heating cycle can be further reduced.
  • the primary heating medium it is possible to employ low- or medium-pressure steam (process steam) in a fibrous web mill. This is cost-effective since this kind of medium is basically available at any place in the fibrous web mill and in any amount. In other words, using low- or medium pressure steam is cost-effective because it is available easily and inexpensively in large quantities.
  • the pressure range of the primary heating medium in the primary heating cycle is preferably 5 to 10 bar. Based on this pressure range and a preferred process surface temperature of the member to be heated of 110 to 120 °C, which are determined by corresponding sensors, the pressure rate, temperature rate, and/or circulating property of the secondary heating medium in the secondary heating cycle may be suitably set by means of a heating transfer control unit.
  • the constitution of the heat exchanging means may be dimensioned such that there is a temperature difference as small as possible between surfaces of the primary heating cycle and the secondary heating cycle of the heat exchanging means. Thus, thermal stresses in the construction of heat exchanging means are reduced.
  • the heat exchanging means may be a liquid/gas heat exchanger, a liquid/liquid heat exchanger or a gas/gas heat exchanger.
  • the belt to be heated can be heated by the condensing secondary heating medium (e.g. water steam) and the primary heating medium (e.g. water and/or steam) remains clean and reusable.
  • the condensing secondary heating medium e.g. water steam
  • the primary heating medium e.g. water and/or steam
  • a device may be provided by means of which a metal belt cycle or roll can be heated by a condensing steam chamber such that recovered condensation medium remains clean and recyclable.
  • the indirect heat exchanging means is a heat exchanger arranged between the primary heating cycle and the secondary heating cycle.
  • the heat exchanger may be a countercurrent/counterflow heat exchanger or a cocurrent/parallelflow heat exchanger.
  • the primary heating medium (preferably, water steam) of the primary heating cycle may be delivered from a steam power unit of the mill and an amount of heat is transferred to the secondary heating medium of the secondary heating cycle via the heat exchanger.
  • the secondary heating medium (e.g. water) of the secondary heating cycle may then be vaporized in the heat exchanger. Then the vaporized secondary heating medium (e.g. water steam) is conveyed (circulated) to the belt to be heated (e.g.
  • the condensed secondary heating medium may be recovered and returned within the secondary heating cycle such that it is vaporized again in the heat exchanger.
  • the secondary heating cycle may be connected to the medium chamber in which the secondary heating medium may condense and heats a surface of the belt to be heated (e.g. inner or outer surface of the belt) with thermal energy released by the condensation of said medium.
  • a pump may be arranged in the secondary heating cycle in order to support or force circulation of the secondary heating medium in the secondary heating cycle.
  • the secondary heating cycle comprises an adjustment means which is adapted to control the pressure amount and/or temperature of the secondary heating medium.
  • the adjustment means may be a pressure adjustment valve by which pressure and/or temperature of the secondary heating medium is controlled.
  • the adjustment means may be connected to the secondary heating cycle, preferably to the medium chamber, and alternatively, the adjustment means may be integrally provided with the secondary heating cycle, preferably with the medium chamber, in order to provide a compact installation space.
  • the adjustment means is provided in order to control the pressure amount and/or temperature of the secondary heating medium (for example, chamber pressure, condensation temperature, etc.).
  • the temperature of the member to be heated is provided (e.g. according to values of the thermodynamic steam table: e.g. pressure 1 bar ⁇ vaporization/condensation temperature 100 °C; 2 bar ⁇ 121 °C; 3 bar ⁇ 134 °C, and so on). That is, temperature of the steam and, thus, that of the belt to be heated may be controlled based on a pressure control of the adjustment means.
  • the adjustment means may include a regulating valve for adding/discharging of new secondary heating medium, if required.
  • the heating device comprises cleaning means which are in contact with the belt in order to clean a surface of the belt which is in direct contact with the secondary heating medium.
  • the cleaning means serve to clean/remove condensed secondary heating medium (i.e. condensate film layer) and, if existing, impurities in the secondary heating medium from said surface.
  • the cleaning means may be formed of at least one elastic blade, doctor blade, scraper unit, or the like.
  • the cleaning means may be arranged within the medium chamber.
  • the cleaning means may be inclined with respect to the surface extending direction of the surface of the belt which is in direct contact with the secondary heating medium.
  • the belt especially, the surface which is in direct contact with the secondary heating medium
  • the belt is dry and free of impurities after being heated by the secondary heating medium.
  • the primary heating cycle and/or the secondary heating cycle are closed cycles.
  • the secondary heating cycle comprises filter means for filtering the secondary heating medium.
  • elements forming the secondary heating cycle are manufactured of corrosion-resistant and/or acid-resistant material, and/or elements forming the primary heating cycle are manufactured of steel-based materials. Since the secondary heating medium in the secondary heating cycle is in contact with the belt to be heated, some impurities of the secondary heating medium are unavoidable for this cycle. Thus, the secondary heating cycle is designed (e.g. manufactured of corrosion-resistant and/or acid-resistant material) such that it endures contaminated and/or acidic medium. Since the primary and secondary cycles are separated from each other, the elements of the primary heating cycle may be manufactured from common steel-based materials. Thus, manufacturing costs of the structure of the heating device are optimized.
  • water is used as the primary heating medium and as the secondary heating medium.
  • water with additives, oil, air, or gas may be used as said heating medium.
  • Fig. 1 schematically shows a processing apparatus having a heating device according to the embodiment of the present invention along the machine-direction of the apparatus.
  • the processing apparatus is used in a pressing, drying and/or finishing section of a fibrous-web treatment machine.
  • the member to be heated 10 is formed by the belt 10 which is impervious to fluids, forms an endless loop and guides the fibrous web W.
  • a moving direction of the belt 10 is indicated by an arrow and corresponds to counter-clockwise direction.
  • a moving direction of the web W is indicated by another arrow in the figure and is guided along and between a surface of the pressing roll 60 and a surface of the belt 10.
  • the belt 10 is guided by means of three guiding rolls 70.
  • the guidance of the belt 10 may be constituted by at least two guiding rolls 70 and is further not delimited to three guiding rolls. That is, four, five or even more guiding rolls may be used for guiding the belt 10 in an endless loop.
  • the processing apparatus comprises two heating devices according to the present invention.
  • at least one heating device may be sufficient to heat the belt 10.
  • the constitution of the heating devices is basically the same, one of the heating devices shown in Fig. 1 is described in further detail.
  • the heating device for heating the belt 10 comprises the primary heating cycle 20 in which a primary heating medium is passed, the secondary heating cycle 30 for heating the belt 10 of the processing apparatus in which a secondary heating medium is circulated, the medium chamber 32 as a part of the secondary heating cycle 30, and the heat exchanger 40 arranged between the first heating cycle 20 and the secondary heating cycle 30 and acting as an indirect heat exchanging means for exchanging heat between the primary heating medium and the secondary heating medium.
  • the secondary heating cycle 30 is formed by the medium chamber 32 and pipings connecting the medium chamber 32 and the heat exchanger 40 and passing through the heat exchanger 40.
  • the secondary heating medium is in direct contact with the belt 10.
  • Sealing means are provided at edges of the medium chamber 32 in order to avoid leakage of the secondary heating medium to surroundings of the secondary heating cycle 30.
  • the sealing means may be a pressure-operated sealing member, i.e. a sealing operating pressure is adjusted in accordance with pressure acting in the medium chamber 32.
  • the sealing member is adapted to act in accordance with a pressure of the secondary heating medium in the medium chamber 32.
  • the secondary heating cycle 30 comprising the medium chamber 32 forms a closed loop.
  • the primary heating cycle 20 may be formed as a closed loop or an open loop.
  • the heat exchanger 40 is arranged (interposed) between the primary heating cycle 20 and the secondary heating cycle 30.
  • the heat exchanger 40 may be a countercurrent/counterflow heat exchanger or a cocurrent/parallelflow heat exchanger.
  • the circulation direction of the secondary heating medium is the counterclockwise direction (see arrows referring to the secondary heating cycle 30 in Fig. 1 ).
  • an amount of heat of the primary heating medium passing in the primary heating cycle 20 is transferred to the secondary heating medium circulating in the secondary heating cycle 30 by means of the indirect heat exchanging means.
  • the primary heating medium (preferably water steam) of the primary heating cycle 20 is delivered from a steam power unit of the fibrous-web mill (not shown) so that the amount of heat is transferred to the secondary heating medium of the secondary heating cycle 30 via the heat exchanger 40.
  • the secondary heating medium (e.g. water) of the secondary heating cycle 30 is vaporized in a conduit portion of the secondary heating cycle 30, which portion is arranged in the heat exchanger 40. Then the vaporized secondary heating medium (e.g. water steam) is conveyed (circulated) to the medium chamber and then gets into contact with the belt 10, where it condenses and amount of heat is transferred to said belt.
  • a conduit portion of the secondary heating cycle 30 which portion is arranged in the heat exchanger 40.
  • the heating device further comprises cleaning means (not shown) which are arranged within the medium chamber 32 and are in contact with the belt 10 in order to clean the surface of the belt 10 which is in direct contact with the secondary heating medium.
  • the cleaning means serve to clean/remove condensed secondary heating medium (i.e. condensate film layer) and, if existing, impurities in the secondary heating medium from said surface.
  • the cleaning means may be formed of at least one elastic blade, doctor blade, scraper unit or the like.
  • the cleaning means may be inclined with respect to the surface extending direction of the surface of the belt 10 (or with respect to the belt moving direction), which is in direct contact with the secondary heating medium.
  • the condensed secondary heating medium is recovered in the medium chamber 32 and returned (circulated) within the secondary heating cycle 30 such that it may be vaporized again in the heat exchanger 30.
  • FIG. 2 schematically shows a processing apparatus having a heating device, which apparatus does not fall within the scope of the appended claims.
  • the indirect heat exchanging means is formed as a part 22 of the primary heating cycle, which part 22 is arranged within the medium chamber 32.
  • the medium chamber 32 forms the secondary heating cycle 30 as such.
  • the part 22 (e.g. conduit) of the primary heating cycle 20 which forms the indirect heat exchanging means is integrated in the medium chamber 32.
  • the part 22 of the primary heating cycle 20 is formed as a conduit part fluid-tightly sealed at entrance and outlet portions (not shown) in the medium chamber 32.
  • the conduit part of the primary heating cycle 20 is arranged in a liquid medium space (lower space) of the medium chamber 32 in which liquid secondary heating medium is contained so that the secondary heating medium vaporize due to the heat exchange by means of the conduit part of the primary heating cycle 20.
  • the vaporous secondary heating medium is circulated to the belt 10 (to the upper space in the chamber), where it condenses and transfers heat to said belt 10.
  • the condensed secondary heating medium will be recirculated to the liquid medium space of the medium chamber 32.
  • the vaporized secondary heating medium rises up (in a vaporous (upper) medium space of the medium chamber 32) and condenses at a process surface of the belt 10, condensates and drops due to gravity to the liquid medium space of the medium chamber 32 so that the heating medium is returned.
  • the liquid medium space is arranged at a lower position in vertical direction than that of the vaporous medium space.
  • heating of the secondary heating medium can also be performed from the upper medium space of the medium chamber 32 as indicated by the (upper) pipings of the primary heating cycle 20 as schematically shown in the upper part of the medium chamber (see Fig .2 ).
  • the secondary heating cycle 30 comprises the adjustment means 34 which is adapted to control pressure amount and/or temperature of the secondary heating medium.
  • the adjustment means 34 is a pressure adjustment valve 34 by which pressure and/or temperature of the secondary heating medium is controlled.
  • the adjustment means 34 may be connected to the secondary heating cycle 30, preferably to the medium chamber 32.
  • the adjustment means 34 may be integrally provided with the secondary heating cycle 30, preferably with the medium chamber 32.
  • the adjustment means 34 may be include a regulating valve (not shown) for adding/discharging of new secondary heating medium in the medium chamber 32 if required.
  • FIG. 3 schematically shows a modification of the processing apparatus shown in Fig. 2 , which apparatus does not fall within the scope of the appended claims.
  • the low- or medium-pressure primary heating medium of the primary heating cycle is further conveyed (passed) after passing through the heat exchanging means 22 to a further process stage to another member to be heated (e.g. the drying cylinder 50 or the like) where it is finally condensed.
  • thermal efficiency of the processing apparatus having a heating device is further improved.
  • the primary heating medium it is possible to employ low- or medium-pressure steam (process steam) in a fibrous web mill. This is cost-effective since this kind of medium is basically available at any place in the fibrous web mill and in any amount.
  • the pressure range of the primary heating medium in the primary heating cycle is preferably 5 to 10 bar. Based on this pressure range and a preferred process surface temperature of the member to be heated of 110 to 120 °C, which are determined by corresponding sensors, the pressure rate, temperature rate, and/or circulating property of the secondary heating medium in the secondary heating cycle may be suitably set by means of a heating transfer control unit.
  • the heating mediums i.e. primary and secondary heating mediums used in the above embodiment and comparative examples are normally water and steam, respectively. Alternatively, water with additives, oil or air or even other gases may be used as the heating mediums.
  • the belt as shown above is made of metal.
  • the belt can be made of synthetics or ceramic materials.
  • various different combinations of at least two of the above materials may be used for the belt constitution.

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  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)

Claims (10)

  1. Prozessgerät zur Verwendung in einer Pressen-, Trocken- und/oder Veredelungspartie einer Faserstoffbahnbearbeitungsmaschine, wobei das Gerät Führungswalzen (70), ein Band (10) und eine Heizvorrichtung zum Heizen des Bands (10) aufweist, wobei das Band (10) fluiddicht ist, eine endlose Schleife ausbildet, durch die Führungswalzen (70) geführt wird und eine zu bearbeitende Faserstoffbahn (W) führt, wobei die Heizvorrichtung Folgendes aufweist:
    einen primären Heizkreislauf (20), in dem ein primäres Heizmedium strömt,
    einen sekundären Heizkreislauf (30) zum Heizen des Bands (10) des Prozessgeräts, in dem ein sekundäres Heizmedium zirkuliert, wobei der sekundäre Heizkreislauf (30) eine Mediumkammer (32) aufweist, in der das sekundäre Heizmedium direkt mit dem zu heizenden Band (10) in Kontakt ist, und
    eine indirekte Wärmetauscheinrichtung (40) zum Tauschen von Wärme zwischen dem primären Heizmedium und dem sekundären Heizmedium, wobei
    eine Wärmemenge des primären Heizmediums, das in dem primären Heizkreislauf (20) strömt, zu dem sekundären Heizmedium, das in dem sekundären Heizkreislauf (30) zirkuliert, mittels der indirekten Wärmetauscheinrichtung (40) übertragen wird, so dass das Band (10) des Prozessgeräts durch das sekundäre Heizmedium beheizbar ist,
    dadurch gekennzeichnet, dass
    das Prozessgerät des Weiteren eine Presswalze (60) aufweist, wobei die Bahn (W) entlang und zwischen einer Oberfläche der Presswalze (60) und einer Oberfläche des Bands (10) geführt wird, und
    die Mediumkammer (32) entlang eines Abschnitts des Bands (10) angeordnet ist, in dem das Band durch die Presswalze (60) oder durch eine der Führungswalzen (70) gestützt ist, wobei das Band (10) zwischen der Press- oder Führungswalze (60, 70) und der Mediumkammer (32) angeordnet ist.
  2. Prozessgerät nach Anspruch 1, wobei die indirekte Wärmetauscheinrichtung (40) ein Wärmetauscher (40) ist, der zwischen dem primären Heizkreislauf (20) und dem sekundären Heizkreislauf (30) angeordnet ist.
  3. Prozessgerät nach einem der vorangegangenen Ansprüche, wobei der sekundäre Heizkreislauf (30) eine Einstelleinrichtung (34) aufweist, die angepasst ist, um ein Druckausmaß und/oder eine Temperatur des sekundären Heizmediums zu steuern.
  4. Prozessgerät nach Anspruch 3, wobei die Einstelleinrichtung ein Druckeinstellventil ist, durch das ein Druck und/oder eine Temperatur des sekundären Heizmediums gesteuert wird.
  5. Prozessgerät nach Anspruch 3 oder 4, wobei
    die Einstelleinrichtung an den sekundären Heizkreislauf (30) bevorzugt an die Mediumkammer (32), angeschlossen ist, oder
    die Einstelleinrichtung einstückig mit dem sekundären Heizkreislauf (30), bevorzugt mit der Mediumkammer (32), vorgesehen ist.
  6. Prozessgerät nach einem der vorangegangenen Ansprüche, das des Weiteren eine Reinigungseinrichtung aufweist, die mit dem Band (10) in Kontakt ist, um eine Oberfläche des Bands (10) zu reinigen, die mit dem sekundären Heizmedium direkt in Kontakt ist.
  7. Prozessgerät nach einem der vorangegangenen Ansprüche, wobei der primäre Heizkreislauf (20) und/oder der sekundäre Heizkreislauf (30) geschlossene Kreisläufe sind.
  8. Prozessgerät nach einem der vorangegangenen Ansprüche, wobei der sekundäre Heizkreislauf (20) eine Filtereinrichtung zum Filtern des sekundären Heizmediums aufweist.
  9. Prozessgerät nach einem der vorangegangenen Ansprüche, wobei Elemente (30, 32), die den sekundären Heizkreislauf (30) ausbilden, aus einem korrosionsbeständigen und/oder säurebeständigen Material hergestellt sind, und/oder Elemente, die den primären Heizkreislauf (20) ausbilden, aus auf Stahl basierenden Materialien hergestellt sind.
  10. Prozessgerät nach einem der vorangegangen Ansprüche, wobei Wasser als das primäre Heizmedium und als das sekundäre Heizmedium verwendet wird.
EP20110174191 2011-07-15 2011-07-15 Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn Not-in-force EP2546412B1 (de)

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EP20110174191 EP2546412B1 (de) 2011-07-15 2011-07-15 Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn

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EP20110174191 EP2546412B1 (de) 2011-07-15 2011-07-15 Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn

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EP2546412A1 EP2546412A1 (de) 2013-01-16
EP2546412B1 true EP2546412B1 (de) 2015-01-21

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FI80102C (fi) * 1988-07-01 1990-04-10 Tampella Oy Ab Foerfarande och anordning foer torkning av en fiberbana.
FI99270C (fi) * 1996-04-12 1998-02-25 Valmet Corp Menetelmä ja sovitelma kuiturainan kuivatuslaitteen lauhdeveden hyödyntämiseksi
FI99273C (fi) * 1996-04-12 1998-02-25 Valmet Corp Sifoni
FI99272C (fi) * 1996-04-12 1998-02-25 Valmet Corp Menetelmä kuiturainan kuivaamiseksi
DE10157687B4 (de) * 2001-11-24 2005-11-17 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn
FI113881B (fi) 2003-05-30 2004-06-30 Metso Paper Inc Hihnarakenne

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