WO2006111611A1 - Gestion d'une procedure de traitement d'une bande fibreuse - Google Patents

Gestion d'une procedure de traitement d'une bande fibreuse Download PDF

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Publication number
WO2006111611A1
WO2006111611A1 PCT/FI2006/050063 FI2006050063W WO2006111611A1 WO 2006111611 A1 WO2006111611 A1 WO 2006111611A1 FI 2006050063 W FI2006050063 W FI 2006050063W WO 2006111611 A1 WO2006111611 A1 WO 2006111611A1
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WO
WIPO (PCT)
Prior art keywords
air
fibrous web
web
moisture
fibrous
Prior art date
Application number
PCT/FI2006/050063
Other languages
English (en)
Inventor
Reijo PIETIKÄINEN
Original Assignee
Metso Paper, Inc.
Ilomäki, Jari
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 Metso Paper, Inc., Ilomäki, Jari filed Critical Metso Paper, Inc.
Publication of WO2006111611A1 publication Critical patent/WO2006111611A1/fr

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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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the present invention relates to the control of a treatment process, involving compression, drying, coating, calendering, and the like, of a fibrous web consisting of paper, tissue, cardboard, pulp, and the like, e.g., in a paper-, tissue-, cardboard-, or pulp- making machine. More specifically, the object of the present invention is a method and arrangement for the control a fibrous-web treatment process in a fibrous-web machine.
  • the fibrous-web treatment unit needs effective air-conditioning or air-exchange due to the high moisture evaporation from the fibrous web.
  • Deficient air-condition or air- exchange results in condensation of the moisture in the air on colder surfaces.
  • the air- conditioning and air-exchange must also be implemented evenly in the cross direction (CD) relative to the fibrous web direction of travel or MD (machine direction), so that the fibrous web will not dry unevenly.
  • Regulating (valving) elements intended for air-treatment and affecting the fibrous web are typically: Water moistener; steam box; chemical-application device; roll-cleaning device; air blowing; drying device; radiation dryer, and other similar device affecting the air-treatment and/or fibrous web - to be permanently installed on a beam in the CD direction.
  • suction and makeup-air valves are in a fixed position, and in unfavorable locations in terms of their intended purpose.
  • a calender preferably a multinip calender
  • a powerful air exchange is
  • a main object of the present invention is to obtain a device that dries the air in a treatment unit, e.g., with a calender, drying section, condebelt-dryer, and the like, in connection with fibrous-web production or finishing treatment (downstream processing).
  • a second main object of the invention is to enable the control and adjustment of a treatment process with a moving regulating element affecting the air treatment and fibrous web.
  • a third object of the invention is to bring about an air-conditioning solution for ventilating the immediate environment of the treatment unit, preferably a calender, more preferably a multiroll calender.
  • the main objects of the invention may generally be attained by a method according to the invention for controlling the fibrous- web treatment process in a fibrous-web making machine, whereby the fibrous web travels through a treatment unit, in which at least one heating effect is directed toward the fibrous web by means of a contact, e.g., a roll or cylinder contact, or contactlessly, e.g., by means of airborne web drying or IR-drying (IR, infrared), e.g., such that for the adjustment and/or control of the fibrous-web treatment process in the treatment unit, at least one operation is directed toward the air surrounding the fibrous web in the treatment unit web affecting the moisture of the fibrous web and/or its surrounding air.
  • a contact e.g., a roll or cylinder contact
  • IR-drying IR, infrared
  • air surrounding the fibrous web is dried in connection with the treatment unit by condensing the moisture in an air-cooling and/or drying device and/or moisture- condensing device on a cooled or colder surface.
  • air is blown toward the fibrous web in the treatment unit or the air surrounding the fibrous web is aspirated by a regulating element, whose place, location or position is movable. It is therefore advantageous to use a regulating element, such as a blow valve, a suction valve, a nozzle, or a duct system connected with such a regulating element.
  • a regulating element such as a blow valve, a suction valve, a nozzle, or a duct system connected with such a regulating element.
  • the main objects of the invention are also generally achievable by an arrangement according to the invention for controlling the fibrous- web treatment unit in the fibrous- web machine, whereby the fibrous web travels in the treatment unit, in which at least one heating effect is directed toward the fibrous web by means of a contact, e.g., a roll or cylinder contact, or contactlessly, e.g., through airborne web drying or IR-drying (IR, Infrared), e.g., such that for the adjustment and/or control of the fibrous-web treatment process in the treatment unit, at least one operation is directed toward the air surrounding the fibrous web in the treatment unit, having an effect on the moisture of the fibrous web and/or the surrounding air.
  • a contact e.g., a roll or cylinder contact
  • IR-drying IR, Infrared
  • the treatment unit contains a surface which is cooled or colder than the environment in order for the humidity in the air to condense on its surface.
  • the regulating element blowing air toward the fibrous web in the treatment unit or aspiring the air surrounding the fibrous web is moveable. It is therefore advantageous that the regulating element is a blow valve, a suction valve, a nozzle, or the equivalent, or a duct system connected with such a regulating element.
  • the surface against the fibrous web in the fibrous- web, roll or cylinder contact may be, e.g., a roll, cylinder or belt-metal surface or polymer surface.
  • a contactless effect is obtained as mentioned above, e.g., by drying in an airborne-web drier or IR drier.
  • a controlled cold drier surface may be arranged, where the moisture is condensed in a controlled fashion without such condensing interfering with the treatment process or the calender, per se.
  • the treatment-unit environment is cleaner, as the treatment unit does not have any surfaces becoming condensed or dirty; c) A large air-conditioning system may be omitted, or its dimensions may be reduced, so that agitation of great air masses may be eliminated, or at least essentially diminished; d) The condensate may be diverted in a controlled fashion; e) Energy is not consumed, as cooling water is generally available in ample amounts, e.g., in rivers and lakes; f) Energy may also be recovered automatically, e.g., for the cooling water. If desired, energy may be obtained for utilization, admittedly at relative low (30-40 °C) recovery temperatures.
  • premises may be heated or the energy fed back into the process;
  • the recovered energy may be re-utilized in the fibrous-web machine, e.g., for heating the feed-box stock or the coating-head paste (viscosity may change slightly);
  • Condensation and air-conditioning problems are hard to predict in the machine- planning phase, but thanks to the present invention, the air conditioning of the machine may easily be adjusted, e.g., in the machine commissioning stage, and the safety of commissioning the fibrous-web machine may be increased.
  • Fig.l is a schematic representation of the operating principle of a first example of the invention.
  • Fig.2 is a schematic representation of an air-cooling and/or drying device and/or a moisture-condensing device of an example shown in Fig. 1 ;
  • Fig. 3 is a schematic representation of an air-cooling and/or drying device and/or a moisture condensing device of a second example shown in Fig.l;
  • Fig. 4 is a schematic representation of a second example of the invention.
  • Fig. 5 is a schematic representation of a third embodiment of the invention.
  • the fibrous web travels through the nip of at least one pair of rolls 31, 32 in the fibrous- web calender 21, 22.
  • a pressure load and a thermal effect is directed toward the fibrous web, causing an irreversible deformation in the fibrous web.
  • the treatment process of the fibrous web W may be adjusted and/or controlled in the calender 31, 32 by directing at least one operation directed or being directing toward the air surrounding the fibrous web, thereby affecting the moisture of the fibrous web and/or its surrounding air.
  • Such an operation is typically air-conditioning or drying.
  • the qualifying phrase "affecting the air surrounding the fibrous web” therefore refers generally to any type of operation to be performed in a fibrous-web W treatment unit 21, 22, 23, such as a compression unit and/or drying unit, especially a drying unit for a papermaking machine and/or cardboard- making machine, or a coating unit or surface-sizing unit, or in a calender, e.g., a multinip calender, a soft calender, a belt calender, a metal-belt calender, or in an equivalent unit affecting the moisture of the fibrous web and/or its surrounding air, whereby the treatment process of the fibrous web may be adjusted and/or controlled by the relevant operation.
  • a compression unit and/or drying unit especially a drying unit for a papermaking machine and/or cardboard- making machine, or a coating unit or surface-sizing unit
  • a calender e.g., a multinip calender, a soft calender, a belt calender, a metal-
  • Such operations are, e.g., treatment-unit air exchange and/or air-conditioning, reduction of the treatment-unit air mass or the fibrous- web moisture, blowing operations toward to the fibrous web and/or suction operations away from the fibrous web.
  • the treatment unit in the embodiment in Figure 1 has a calender 21, 22 consisting of two successive roll systems.
  • the calender may be encased, as indicated by the dotted line.
  • the advantage of the encased calender unit is that the ambient air, e.g., the machine-room air, is separated from the air surrounding the fibrous web.
  • the order, type, or nips of rolls, or the path of the fibrous web are not important, per se, for the present invention, since the field of application of the present invention is the influencing of the air surrounding the fibrous web, whereby the field of application of the present invention relates to all fibrous- web- machine units irrespective of the order or type or nips of the roll or rolls.
  • the fibrous web W in the calender 21, 22 of the example shown in Fig. 1 travels in a winding fashion through the nip.
  • the influencing of the air surrounding the fibrous web may be controlled, e.g., by an air-cooling and/or drying device and/or a moisture- condensing device 15 according to Fig. 2, or an air-cooling and/or drying device and/or a moisture-condensing device 16, or an air-conditioning device according to Fig. 3.
  • air circulation for the calender is provided, so that air may recirculate through an air-cooling and/or drying device, and/or a moisture-condensing device 15, 16.
  • the air-cooling and/or drying device, and/or the moisture-condensing device, and/or the air-conditioning device by using the term drying unit for the sake of simplicity.
  • the airflow in the calender 21, 22 occurs through flow gates 11 of the drying unit 15 that are stationary and cooled by a cooling agent.
  • the cooling agent flows in flow channels 2 in separation walls 51 that are arranged to separate the flow gates from one another.
  • the outer surfaces of the separation walls confining the flow gates are cooled and as a result, the moisture of the airflow is condensed on the cold surfaces of the separation walls.
  • the air is dried in the flow channels, and the condensation water released from the air flows as a liquid into the condensate collection means 41 below the separation walls, e.g., a collector tray, and further into a discharge means, e.g., a discharge assembly.
  • the drying unit 15 of the example shown in Fig. 2 is preferably a heat exchanger operating according to the upstream or downstream principle.
  • the separation walls 51 and the flow channels 2 for the cooling agents, e.g., cooling water, and the flow gates 11 confined by the separation walls are typically kept stationary
  • the airflow in the calender 21, 22 according to the example shown in Fig. 3 occurs through a stationary annular channel 12.
  • the annular channel is confined externally by a non-rotating casing part 42, and internally by a rotating heat-exchange cell 52 provided with flow channels 2 for a cooling agent, e.g., cooling water, or cooling-agent circulation.
  • a cooling agent e.g., cooling water, or cooling-agent circulation.
  • the rotating external surface of the heat-exchange cell acts as a condensing surface, on which the moisture of the airflow is condensed and the air dried.
  • the external surface of the heat-exchange cell 52 may be slotted and/or ribbed 53 in order to increase the condensation area.
  • the inside condensate/condensation water from the external surface is released partly due to the effect of the centrifugal force, and partly by means of, e.g., a rubber scraper blade 43 located on the inside surface of a casing part, e.g., a protective hood, acting on the outer surface casing.
  • a rubber scraper blade 43 located on the inside surface of a casing part, e.g., a protective hood, acting on the outer surface casing.
  • the condensate/condensation water escapes into a condensate/condensation-water collecting means 41, e.g., a collector tray, and further into a discharge means, e.g., a discharge assembly.
  • a discharge means e.g., a discharge assembly.
  • the fibrous web to be calendered is dried considerably in the calender 21, 22, 23, by as much as five percentage points, as the evaporating water amounts, e.g., on a 10 m wide multi-roll calender, is in the 0.6-1.0 kg/s category.
  • the energy needed for such evaporation is about 1.5-2.0 MW, which in a calender may be produced primarily by means of a thermo-roll 31.
  • the evaporating moist air when precipitating, releases the same amount of energy, as is carried off by the air-cooling and/or drying device, and/or moisture-condensing device 2 arranged in the calender, in which cooling- agent circulation, e.g., cooling-water circulation, takes place.
  • a critical criterion is the efficiency of the condensing surface, especially its heat transfer coefficient, which is reduced by the condensing water layer (or film).
  • a typical calender air mass 50 0 C, 50% RH condenses at a temperature of about 35-45 0 C. Cooling the condensing surface to about 20 °C, produces a heat-transfer coefficient of about 10-15 kW/m 2 K on the surface, whereby a condensing surface area of about 10-20 m 2 is sufficient in order to obtain the needed condensation effect. Making the condensation removal more efficient allows for a smaller surface area.
  • a regulating element 72, 73, 81 according to the present invention.
  • a regulating element according to the present invention contains a valve 73, such as a compensation [or: makeup-air]/blow valve, or a suction valve, and a nozzle connected with the valve 81, as well as a duct channel 72 connected with the valve.
  • the regulating element 72, 73, 81 is moveable, or the place of the regulating element may be moved, at least in the direction of travel of the fibrous web (downstream direction).
  • the regulating element may be moved in the direction of the support frame (not shown) of the roll cluster 31, 32, e.g., along the support structure (pillar] 70.
  • the roll cluster 31, 32 is essentially a vertical roll cluster, as shown in the figure, or a tilted roll cluster, or a roll cluster, whereby the moving line winds itself through the rotational axes of the rolls.
  • Another possible direction of travel of the regulating element affecting the treatment of the fibrous web W is moving the regulating element in the direction of travel of the machine line, or generally following the travel of the fibrous web; as an example may be mentioned a soft calender.
  • the present invention makes it possible to adjust the - the regulating element's 72, 73, 81
  • An advantageous regulating element affecting the moisture of the fibrous web and/or its surrounding air is a drying unit 15, 16, which may also be, as explained above, an air- condensing device or an air-conditioning system.
  • the regulating element of the embodiment shown in Fig. 4 is arranged either at the lower end or lower part of the support structure.
  • the air being dried or whose moisture is adjusted may be directed through the support structure on [top of] the regulating elements 72, 73, 81, which are movable along the support structure.
  • a blow nozzle 81 for example, may be in connection with the regulating element.
  • the air directed on to the regulating element may also come from somewhere other than a drying unit.
  • Such an option, considered to be advantageous is to take the air to the regulating element directly from the vicinity of the calender 21, 22, the air-conditioning system, or the air- condensing device.
  • Such a moveable regulating element allows the following:
  • the position of the water-moistening device relative to the thermo-roll nip is changeable, as well as mountable, at completely different points in the roll cluster system, e.g., in the thermo-roll space; - to take into account into account various run situations, the position of the steam box is changeable;
  • the position of the regulating element may be changed, e.g., by swing machines, provided with so-called variable run modes, e.g., matte-nip run / partial nip run, in order to run various paper grades,
  • a moveable cleaning device is needed on all rolls 31 , 32 of the roll system 21, 22, whereby, advantageously, the amount of cleaning devices is minimized as there is no need to install a device for each roll.
  • Fig. 4 illustrating a solution for a regulating element 72, 73, 81 in order to obtain mobility.
  • the regulating elements are connected with a moveable service platform 61, a maintenance bridge 71, a hoist 74 or other similar means on the support structure in order to enable mobility on the roll system 21, 22.
  • the service platform, hoist, etc. are designed such that they may be moved to a desired position relative to the rolls 31, 32 of the roll system.
  • the support structure 70 also has the necessary motion devices in order to move the regulating element in the roll-system direction. The most typical directions of motion for the operating position and in the operation position are:
  • the arrangement according to Fig. 4 enables positional adjustment of the regulating elements 72, 73, 81, such as the blow valve, makeup-air valve, suction-air valve 73 and their duct system 72 or nozzle 81, and/or adjustment of the blow/suction direction, whereby the position and/or direction of the regulating elements needed for ventilating the environment of the fibrous web W in the calender 21, 22, and/or the direction of the exhaust suction and blow direction may be adjusted if necessary. Moreover, it becomes possible to direct the exhaust suction and blowing onto the desired area of the calender.
  • the regulating elements 72, 73, 81 such as the blow valve, makeup-air valve, suction-air valve 73 and their duct system 72 or nozzle 81
  • the blow/suction direction whereby the position and/or direction of the regulating elements needed for ventilating the environment of the fibrous web W in the calender 21, 22, and/or the direction of the exhaust suction and blow direction may be adjusted if necessary.
  • the duct system 72 e.g., an air-conditioning duct system, connected with the regulating element 72, 73, 81 according to the invention, or forming a such duct system, is placed on a connection for a service platform 61, service bridge 71, hoist 74 or other similar means, whose position may be moved, and whose position, e.g., directional height position, may be changed during calendering, so that the desired position of the duct system connected with the regulating element, preferably a blow valve or suction air valve or similar valve, may be obtained.
  • a blow valve or suction air valve or similar valve preferably a blow valve or suction air valve or similar valve
  • Fig. 5 showing a third embodiment considered advantageous for air-conditioning the calender environment, especially in connection with a multi-roll calender.
  • the position of the regulating elements 72, 73, 81 needed to ventilate calender environment in the calender 21, 22, i.e., at least the fibrous-web W environment, and/or the direction of blowing and/or suction produced by the regulating element is/are adjustable.
  • the blowing and/or suction may be controlled [or: directed] by the regulating element.
  • the blowing and/or suction may be controlled [or: directed] onto the condensing area for the air containing moisture.
  • the air-conditioning duct system 72 is placed in a positionally adjustable way on a connection for the service bridge 71, the hoist, or other similar position-adjustable means.
  • the duct system connected with the regulating element 72, 73, 81 includes a length- adjustable nozzle part 81, or the regulating element itself may be of the length-adjustable or telescope type.
  • the supply channel 80 connected with the duct system 72 is of the length-adjustable, e.g., so-called telescope type.
  • the supply channel may be arranged, e.g., on the inside of the hydraulic and/or pneumatic-force cylinder moving the service bridge, so that the supply channel will be connected with the duct system 72 at the top.
  • the duct system 21, 22 includes a telescope part 80 or other similar flow channel 80, whose length may be changed in the vertical direction or the direction of the web W travel.
  • An advantageous regulating element affecting the moisture of the fibrous web and/or the surrounding air is the drying unit 15, 16, which may also be an air-condensing device or an air-conditioning system.
  • the regulating element in the example shown in Fig. is arranged either on the lower end or lower part of the support structure 70. Thus the air being dried or whose moisture is adjusted may be directed into the length-adjustable flow channel.
  • the direction and force of the suction/blowing often need to be adjustable.
  • the blowing and/or suction related to the ventilation and/or air-conditioning may occur in more than one position in the CD direction, so that there will be more than one regulating element 72, 73, 81 affecting the air surrounding the fibrous web.
  • the influencing of the fibrous web may occur in the CD direction through a slotted nozzle.
  • the air surrounding the fibrous web W may be influenced and the fibrous-web processing in the calender 21, 22 controlled such that the regulating elements 72, 73 81 may be guided in the CD direction, independently of one another. If necessary., the valves provided in the regulating elements may also be moved in the CD direction.
  • Fig. 6 shows the processing of the fibrous web by means of the metal belt 5.
  • a metal belt may be used essentially in all fibrous-web units, e.g., a press unit, drying unit, coating unit, and calender 21, 22.
  • the metal belt processing the fibrous web in the example shown in Fig. 6 travels to the supporting thermo-roll 31 and the guide roll 6, of which there are four in the example shown in Fig. 6.
  • the tension of the metal belt may be adjusted, and the metal belt heated and cooled.
  • the thermo-roll may be in contact with the opposing roll 32 in order to form a thermo-roll nip, whereby the metal belt and the fibrous web W to be processed travel through the thermo-roll nip.
  • the drying unit of the example shown in Fig. 6 is arranged on the lower part of the thermo-roll.
  • the moist air is directed, for example, straight from the environment of the thermo-roll or roll pair consisting of the thermo-roll and its opposing roll, and/or from the surrounding air, e.g., the air of the machine hall, to the drying unit 15, 16, from where the air being dried is directed to the environment of the thermo-roll 31 or the above- mentioned roll pair.
  • the radius of the rolls in the treatment unit The flexibility of the soft roll; ⁇ and whereas among the mentioned parameters, the most important ones being the line load and the temperature of the roll to be heated up, e.g., the thermo-roll temperature, it is obvious that the applicability of the present invention in terms of its object is not limited to the calender according to the examples considered advantageous and explained above, instead the present invention may be applied generally in various fibrous-web-machine units, where a roll or cylinder contact affects the fibrous web.
  • the regulating element explained above comprising a channel and a valve, as well as a nozzle, achieving the controlled effect, may also be a drying device, steam box and/or a cleaning device, per se, essentially affecting the moisture of the fibrous web and/or its surrounding air.
  • the surrounding air moisture and temperature of the fibrous web may thus be influenced in fibrous web processing by controlling the surrounding air in a novel and inventive way, as a result of which: Process advantages are obtained; Improved drivability and operational reliability and cleanliness are obtained; The drying unit, especially condensate removal becomes simpler, large air masses no longer need to be moved over long distances.

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Abstract

L'invention porte sur un procédé et sur un dispositif de commande d'un module de traitement d'une bande fibreuse (W) dans une machine prévue à cet effet. La bande fibreuse se déplace dans le module de traitement (21, 22, 23) dans lequel la chaleur peut être dirigée vers la bande fibreuse par contact ou sans contact. L'invention est caractérisée en ce qu'au moins une opération peut être dirigée vers l'air entourant la bande fibreuse dans le module de traitement, ce qui affecte l'humidité de la bande fibreuse ou de l'air environnant.
PCT/FI2006/050063 2005-04-20 2006-02-13 Gestion d'une procedure de traitement d'une bande fibreuse WO2006111611A1 (fr)

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FI20055182 2005-04-20
FI20055182A FI118389B (fi) 2005-04-20 2005-04-20 Kuiturainan käsittelyprosessin hallinta

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WO2006111611A1 true WO2006111611A1 (fr) 2006-10-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009013259A1 (fr) * 2007-07-26 2009-01-29 Voith Patent Gmbh Dispositif d'application

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB746244A (en) * 1953-06-30 1956-03-14 Svenska Flaektfabriken Ab Method of drying or similarly treating web-like material
GB1430108A (en) * 1972-05-30 1976-03-31 Walker Pty Ltd J R Drying apparatus
FI911521A (fi) * 1991-03-28 1992-09-29 Valmet Paper Machinery Inc Superkalanteri
US5651863A (en) * 1994-04-13 1997-07-29 Voith Sulzer Finishing Gmbh Apparatus and method for treating a sheet of material
US5937538A (en) * 1996-05-21 1999-08-17 Fort James Corporation Through air dryer apparatus for drying webs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB746244A (en) * 1953-06-30 1956-03-14 Svenska Flaektfabriken Ab Method of drying or similarly treating web-like material
GB1430108A (en) * 1972-05-30 1976-03-31 Walker Pty Ltd J R Drying apparatus
FI911521A (fi) * 1991-03-28 1992-09-29 Valmet Paper Machinery Inc Superkalanteri
US5651863A (en) * 1994-04-13 1997-07-29 Voith Sulzer Finishing Gmbh Apparatus and method for treating a sheet of material
US5937538A (en) * 1996-05-21 1999-08-17 Fort James Corporation Through air dryer apparatus for drying webs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009013259A1 (fr) * 2007-07-26 2009-01-29 Voith Patent Gmbh Dispositif d'application

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FI118389B (fi) 2007-10-31
FI20055182A0 (fi) 2005-04-20
FI20055182A (fi) 2006-10-21

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