EP2803765A1 - Verfahren und System zur Stabilisierung von Papier in Papiertrocknungsmaschinen und -verfahren - Google Patents

Verfahren und System zur Stabilisierung von Papier in Papiertrocknungsmaschinen und -verfahren Download PDF

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Publication number
EP2803765A1
EP2803765A1 EP13380019.3A EP13380019A EP2803765A1 EP 2803765 A1 EP2803765 A1 EP 2803765A1 EP 13380019 A EP13380019 A EP 13380019A EP 2803765 A1 EP2803765 A1 EP 2803765A1
Authority
EP
European Patent Office
Prior art keywords
paper
critical area
sheet
fabric
confinement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13380019.3A
Other languages
English (en)
French (fr)
Inventor
Luis Oscar López Mesas
Iraide Larrea Uribiarte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRUNNSCHWEILER SA
Original Assignee
BRUNNSCHWEILER SA
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 BRUNNSCHWEILER SA filed Critical BRUNNSCHWEILER SA
Priority to EP13380019.3A priority Critical patent/EP2803765A1/de
Publication of EP2803765A1 publication Critical patent/EP2803765A1/de
Withdrawn legal-status Critical Current

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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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • 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
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems

Definitions

  • the invention refers to a method and system for the stabilization of paper applicable in paper drying machines and processes, widely used in industrial plants for the production of paper.
  • One of the main processes comprised in paper manufacturing is the paper dryer section.
  • a continuous sheet of paper is conveyed via a horizontal arrangement or line of metallic drying cylinders, which are used for reducing the degree of humidity of the sheet of paper that was formed in previous stages of the process.
  • the drying cylinders are internally fed with steam, which condenses inside the drying cylinder, thereby releasing heat towards the surface of the drying cylinder and thus creating the temperature in said surface to reach values in the order of 80 - 150 oC.
  • the continuous sheet of paper that is conveyed along the exterior of the cylinders gradually loses its humidity due to the heat absorbed from the external surface of each cylinder.
  • a woven mesh or dryer fabric is commonly used that presses the sheet of paper against the drying cylinder, in a sandwich-like arrangement, thus improving the contact between the continuous sheet of paper and the external surface of the drying cylinder in order to enhance the heat transfer from the surface of the drying cylinder to the paper.
  • a first problem that arises in paper drying processes is that the high level of humidity of the paper sheet makes it prone to adhere to the surface of the drying cylinder due to the high temperature of said surface.
  • This adhesion phenomenon is more pronounced in the first dryers of the plant, which is the phase in the process where paper is less resistant because of its high level of initial humidity, so that higher temperatures are required on the surfaces of these first drying cylinders for various reasons of operability or paper quality requirements.
  • the aforementioned adhesion effect is disadvantageous to the objective of stabilizing paper, as it strongly conditions the operability of the machines used in the dryer section.
  • a second problem that occurs in paper drying processes is that the external air currents induced by the machines' speed are capable of passing through the woven mesh or dryer fabric, as those are porous and permeable. This results in the formation of air pockets in certain points that cause the paper sheet (not permeable) to separate or detach from the dryer fabric (permeable). These points can be considered as critical areas, as it is in these areas where the paper loses stability and may even tear up. This problem caused by external air currents further aggravates the negative impact of the adhesion phenomenon mentioned above.
  • a vacuum zone refers to an area where air is displaced towards one direction in order to flatten the paper sheet against the dryer fabric.
  • the generation of vacuum zones is necessary for avoiding the formation of wrinkles in the paper sheet and for enabling the containment of unwanted external air currents, which would disrupt the generated vacuum. In this way, an additional supplementary tension is generated that acts against the tendency of the paper to adhere to the hot surface of the dryer.
  • Positive pressure systems based on the Coanda and Bernoulli effects, the required vacuum is generated by insufflating, injecting or blowing a high velocity jet or airflow towards the immediate surroundings of the fabric.
  • negative pressure systems vacuum is created by means of direct aspiration or suction in certain areas between the fabric and the stabilization equipment.
  • the blowing or suction means commonly used may be located in the external stabilization equipment or in one of the turning rolls placed between two consecutive drying cylinders for guiding the sheet of paper. Turning rolls are usually perforated or slotted for enabling suction.
  • the two stabilization systems described are more effective when the vacuum generating devices and the fabric are in close proximity. It is precisely in the critical areas where the paper becomes detached that there is a need for higher vacuums, which requires a closer proximity of the blowing jets or suction elements.
  • the stabilization system it is inevitably necessary for the stabilization system to be provided with sealing or closing elements that allow for the concentration or confinement of the high vacuums generated in said critical areas, where the adhesion phenomena are at their maximum.
  • the objective of the present invention is to offer a method and system of stabilization that succeeds in avoiding the use of sealing or closing elements or other elements aggressive to the fabric that could damage the same.
  • Another objective of the invention is a stabilization system that manages to control the generated high vacuums and to maintain the sealing of the critical area and the safety distance between the fabric and the stabilizing equipment without entailing an increase of the energy consumption.
  • the object of the present invention is a method and system for the stabilization of paper applicable in a dryer section of a sheet of paper that is conveyed in a direction H, where said dryer section comprises a first drying cylinder, at least a second drying cylinder adjacent to the first drying cylinder and a fabric that keeps the sheet of paper in position while the fabric and the sheet of paper are conveyed along the surface of the drying cylinders.
  • An intermediate space is delimited between the drying cylinders and external to the fabric; in this intermediate space there is at least one critical area where the sheet of paper and the fabric tend to separate due to an external air current or due an adhesion phenomenon of the sheet of paper against the surface of the drying cylinders.
  • the method according to the invention has the particularity of comprising the following steps: procuring a stabilizer box positioned in the intermediate space, where the stabilizer box comprises at least one blowing element capable of generating an airflow against the traveling direction H of the sheet of paper; generating a high circulation vortex in the critical area; and confining the high circulation vortex within the critical area.
  • the stabilizer box in the stabilization system comprises a blowing outlet that is adapted to inject an airflow, from inside the stabilizer box towards the critical area and against the travelling direction H, that generates a high circulation vortex in the critical area.
  • the stabilizer box also comprises a superior confinement element, an inferior confinement element and a concave surface that is located between the two confinement elements. Said confinement elements and concave surface surround the critical area in order to confine the high circulation vortex within the critical area. The confinement of the high circulation vortex within the critical area prevents it from being distorted and become dispersed due to the adverse effect of the fabric's velocity.
  • the thus generated and confined high circulation vortex interacts directly on the one hand with the fabric and on the other hand with the stabilizer box, while also delimiting a high vacuum zone inside the high circulation vortex.
  • This high vacuum zone confined inside the high circulation vortex prevents the extreme proximity between the confinement elements of the stabilizer box and the fabric, thus preventing the contact between the fabric and said confinement elements that are susceptible to wear out or damage the fabric.
  • Another inherent advantage of the mechanism of generating a high vacuum according to the invention is the generation of vacuums of a similar magnitude with a lower consumption of mechanical power.
  • a second vortex is generated, which improves the sealing of the critical area, contributes in preventing the penetration of any external air current induced by the movement of the fabric and enhances the high vacuum in the critical area.
  • the high vacuum zone inside the high circulation vortex is referred to as high vacuum because its magnitude is higher in comparison with other zones of medium vacuum that are present in the intermediate space between the drying cylinders.
  • the invention defines a method for the stabilization of paper applicable in a paper dryer section, where a continuous sheet of paper (1) is conveyed via an arrangement or line that usually comprises various drying cylinders.
  • the invention also refers to a stabilizing system, a specific embodiment of which is shown in Figure 1 .
  • Figure 2 shows a more detailed representation of the embodiment of Figure 1 and its arrangement between two consecutive drying cylinders.
  • the sheet of paper (1) in the partially represented dryer section is conveyed in a direction H along the surface of a first drying cylinder (2), along the surface of at least a second drying cylinder (3) adjacent to the first drying cylinder (1) and along the surface of a turning roll (4) placed between two drying cylinders (2, 3).
  • the turning roll (4) guides the sheet of paper (1) and is usually placed between each pair of two consecutive drying cylinders of the dryer section.
  • the dryer section also comprises a fabric (5) that is conveyed along with the sheet of paper (1) and keeps the sheet of paper (1) in position, in such a way that both are conveyed along the surface of the drying cylinders (2, 3) and the turning roll (4).
  • An intermediate space (6) is delimited between the drying cylinders (2, 3) and external to the fabric (5). In said intermediate space (6) there is at least one critical area (7) where the sheet of paper (1) and the fabric (5) tend to separate due to an external air current (8) or due to the phenomenon of the adhesion of the sheet of paper (1) against the surface of the drying cylinders (2, 3).
  • the critical area (7) represented in Figure 1 is specifically located around a detachment area (9) where the sheet of paper (1) detaches from the first drying cylinder (2) and continues its way towards the turning roll (4).
  • the critical area (7) around the detachment area (9) is among the most problematic, but there may also be other critical areas in the intermediate space (6), not represented in Figure 1 , that may be affected by the adhesion phenomena and/or external air currents.
  • the stabilization method according to the invention comprises the following steps: procuring a stabilizer box (10) positioned in the intermediate space (6), where said stabilizer box (10) comprises at least one blowing element that is capable of generating an airflow (11) against the traveling direction H of the sheet of paper (1), as can be observed in Figure 2 ; generating a high circulation vortex (12) in the critical area (7) and confining the high circulation vortex (12) within the critical area (7).
  • a vortex is a circular or rotary flow that possesses vorticity; vorticity is the circulation per unit area at a determined point of the flow and it is a vector magnitude, the direction of which is the axis of the vortex or eddy.
  • Figure 3 shows a detailed enlargement of the critical area (7) and a schematic representation of the formation of the high circulation vortex.
  • the fact of placing a stabilizer box (10) inside the intermediate space (6) allows reducing the total space in which vacuum zones have to be generated for controlling the various critical zones.
  • the stabilizer box (10) also serves as a support for positioning the necessary media that generate a high vacuum zone (13) in the critical area (7), in particular, for positioning the blowing element that generates the airflow (11).
  • the method according to the invention is based on generating a high speed rotary flow or high circulation vortex (12) right at the critical area (7), and preventing the high circulation vortex (12) from being dispersed outside the critical area (7).
  • the high circulation vortex (12) interacts simultaneously with both the fabric (5) and the wall of the stabilizer box (10) in the critical area (7). This way, the high vacuum zone (13) is confined inside the high circulation vortex (12) without the need of additional elements and with optimal energy consumption.
  • the stabilizer box (10) may be kept at an adequate distance from the fabric (5) and be free of closing, sealing or confining elements that are aggressive to the fabric (5), aggressiveness being understood as said elements being placed at too close of a distance to the fabric (5).
  • the embodiment of the stabilization system represented in the figures allows performing the steps of the method according to the invention.
  • the stabilization system according to the invention is applicable in a dryer section of a sheet of paper (1) conveyed in a direction H.
  • the dryer section comprises a fist drying cylinder (2), at least a second drying cylinder (3) adjacent to the first drying cylinder (1) and a fabric (5) that keeps the sheet of paper (1) in position while both are conveyed along the surface of the drying cylinders (2, 3).
  • a turning roll (4) is placed between the drying cylinders (2, 3) for guiding the sheet of paper (1).
  • An intermediate space (6) is delimited between the drying cylinders (2, 3) and the turning roll (4), and external to the fabric (5).
  • the stabilization system has the particularity of comprising a stabilizer box (10) that is placed in the intermediate space (6).
  • the stabilizer box (10) comprises a blowing outlet (14) that is adapted to inject an airflow (11), which generates a high circulation vortex (12) in the critical area (7).
  • the airflow (11) is injected from the blowing opening (14), from inside the stabilizer box (10) towards the critical area (7) and against the travelling direction H of the sheet of paper (1).
  • the stabilizer box (10) also comprises a superior confinement element (15), an inferior confinement element (16) and a concave surface (17) located between the two confinement elements (15, 16).
  • the confinement elements (15, 16) are projections, sealing elements or other elements capable of redirecting the airflow (11) in order to form and confine the high circulation vortex (12).
  • the confinement elements (15, 16) and the concave surface (17) surround the critical area (7), as can be seen in the embodiment represented in the figures, in order to confine the high circulation vortex (12) within the critical area (7).
  • Figure 3 also shows the rotational airflow of the high circulation vortex (12) of the embodiment according to the invention shown in Figures 1 and 2 .
  • the high circulation vortex (12) is generated and is centered, localized or confined in the critical area (7) by the combined action of the airflow (11), the movement of the sheet of paper (1) in the direction H, the concave surface (17) and the confinement elements (15, 16).
  • the high circulation vortex (12) makes it possible to generate and confine the desired high vacuum in the critical area (7) by means of a method that is not exclusively based on the Bernoulli and Coanda effects, as is the case in other, conventional solutions.
  • the Coanda effect is known in Fluid Mechanics as the physical phenomenon whereby a fluid current tends to be attracted to a surface adjacent to its trajectory under the right conditions with respect to the fluid's angle of incidence and the curvature of the surface.
  • the result of this attraction that the fluid experiences is the creation of an imbalance of pressures in the affected fluid due to the Coanda effect, which leads to the appearance of a vacuum in the proximity of the blowing outlet that insufflates said stream or fluid.
  • the Bernoulli effect which derives from the Bernoulli equation on conservation of energy in a fluid, implies that an increase of a fluid's velocity results in a decrease of the fluid's pressure while the potential energy is maintained constant.
  • the known stabilization systems that generate high vacuums based on the combination of these two principles and/or direct suction entail, as explained above, a high energy consumption and an excessive approximation between the devices generating the vacuum and the fabric.
  • the vacuum is generated by the Bernoulli effect through the airflow (11), but the vacuum is confined in the critical area (7) by the high circulation vortex (12) and using non-aggressive confinement elements, with the system presenting an acceptable consumption.
  • the presence of the high circulation vortex (12) makes it possible not to have to bring the confinement elements (15, 16) too close to the fabric (5), thus achieving a safety distance d or d', e.g. within the range of 10 - 20 mm, which is sufficient for avoiding damages to the fabric (5).
  • the geometry of the stabilizer box (10) according to the invention is especially designed to maximize the circulation of the high circulation vortex (12), in a way that the vacuum in the high vacuum zone (13) is as high as possible, and contributes in avoiding its distortion.
  • the concave surface (17) presents a substantially circular curvature that distorts the confined high circulation vortex (12) as less as possible.
  • the curvature presents a preferable diameter of about 40 - 70 mm.
  • the inferior confinement element (16) prevents the high circulation vortex (12) from being dispersed towards other areas of the intermediate space (6) that are below the critical area (7).
  • said inferior confinement element (16) is free of sharp edges that are aggressive or damaging to the fabric (5) and also complicate maintenance tasks.
  • the method according to the invention comprises the additional step of generating a second vortex (18) outside the critical area (7) that prevents the external air current (8) from penetrating inside the critical area (7).
  • This second vortex (18) entails a great advantage: it assists and boosts the action of the high circulation vortex (12) by acting as a physical stopper and preventing the entry of external air currents induced by the fabric's (5) velocity.
  • the joint action of the two vortices (12, 18) optimizes the formation of the high vacuum zone (13) in the critical area (7).
  • the airflow (11) itself of the stabilization system according to the invention that generates the second vortex (18) outside the critical area (7) for preventing the external air current (8) from penetrating inside the critical area (7).
  • the formation of this second vortex (18) in an area above the critical area (7) can be observed in the embodiment shown in Figure 3 .
  • the formation of both vortices (12, 18) is achieved due to a certain symmetry of the airflow (11), symmetry being understood as the dispersion of the airflow (11) in two directions, as shown in the figure.
  • the formation of the high circulation vortex (12) has already been explained above.
  • the second vortex (18) is generated and maintained outside the stabilizer box (10) by the combined action of the airflow (11), the external air current (8) and the geometry of the stabilizer box (19).
  • the stabilizer box (10) in the embodiment shown in Figure 3 presents an external wall (19) that favours the confinement of the second vortex (18) and prevents its distortion.
  • the exact form of the external wall (19), the velocity of the airflow (11) and the geometry in general of the stabilizer box (19) in the system according to the invention may be variable in order to adapt to the variety of machines present in dryer sections, as long as the formation of the high circulation vortex (12) is achieved.
  • the operability of these machines ranges between their minimum and maximum working speed, and those speed limits will define the exact geometry of the stabilizer box (10) in order to adapt to each critical area.
  • the stabilization method comprises the additional step of generating a direct aspiration over the critical area (7) for enhancing the confinement of the high circulation vortex (12) in the critical area (7).
  • said direct aspiration on the critical area (7) is carried out by an aspiration element (not shown in the figures) located inside the concave surface (17), between the blowing outlet (14) and the inferior confinement element (16).
  • the stabilizer box (10) of the system according to the invention comprises at least one additional blowing outlet (20) that allows for the control of the vacuum generated in other areas of the intermediate space (6) that are located in the lower part of the critical area (7).
  • the additional blowing outlet (20) is located at the lower part of the stabilizer box (10), generating a stream against the moving direction of the turning roll (4), which contributes to the generation of a zone of medium vacuum (21) in the intermediate space (6).
  • the method and system of the invention makes it possible to combine the generation of the vortices (12, 18) with other, additional elements of suction or blowing that assist or boost the vacuums in the intermediate space (6).
  • additional suction or blowing elements may be placed in various locations: in the stabilizer box (10), in the turning roll (4) -which may have openings, slots or perforations designed to this end-, or others.

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EP13380019.3A 2013-05-17 2013-05-17 Verfahren und System zur Stabilisierung von Papier in Papiertrocknungsmaschinen und -verfahren Withdrawn EP2803765A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13380019.3A EP2803765A1 (de) 2013-05-17 2013-05-17 Verfahren und System zur Stabilisierung von Papier in Papiertrocknungsmaschinen und -verfahren

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Application Number Priority Date Filing Date Title
EP13380019.3A EP2803765A1 (de) 2013-05-17 2013-05-17 Verfahren und System zur Stabilisierung von Papier in Papiertrocknungsmaschinen und -verfahren

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EP2803765A1 true EP2803765A1 (de) 2014-11-19

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050693A1 (en) * 1999-02-22 2000-08-31 Metso Paper, Inc. Blowing apparatus in a paper machine or the like
US6247247B1 (en) 1997-04-23 2001-06-19 Metso Paper, Inc. Blow box for the drying section of a papermaking machine, method for sealing a pocket with a blow box in the drying section of a papermaking machine, and arrangement in a papermaking machine
US6848195B2 (en) 2001-11-08 2005-02-01 Metso Paper, Inc. Blow box for controlling the web run
US8117765B2 (en) 2005-06-06 2012-02-21 Metso Paper, Inc. Apparatus and method of sealing of a pocket space between drying cylinders in a paper machine or a board machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6247247B1 (en) 1997-04-23 2001-06-19 Metso Paper, Inc. Blow box for the drying section of a papermaking machine, method for sealing a pocket with a blow box in the drying section of a papermaking machine, and arrangement in a papermaking machine
WO2000050693A1 (en) * 1999-02-22 2000-08-31 Metso Paper, Inc. Blowing apparatus in a paper machine or the like
US6848195B2 (en) 2001-11-08 2005-02-01 Metso Paper, Inc. Blow box for controlling the web run
US8117765B2 (en) 2005-06-06 2012-02-21 Metso Paper, Inc. Apparatus and method of sealing of a pocket space between drying cylinders in a paper machine or a board machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
THIELE E W ET AL: "A NEW PAPER MACHINE DRYING CONCEPT: A MULTIFUNCTIONAL, RADIAL-JET REATTACHMENT NOZZLE BLOW BOX", TAPPI JOURNAL, TECHNICAL ASSOCIATION OF THE PULP & PAPER INDUSTRY. ATLANTA, US, vol. 76, no. 7, 1 July 1993 (1993-07-01), pages 203 - 207, XP000420395, ISSN: 0734-1415 *

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