WO2010000938A2 - Paroi terminale d’un sécheur de pâte, sécheur de pâte et procédé de surveillance des parties internes d’un sécheur de pâte - Google Patents

Paroi terminale d’un sécheur de pâte, sécheur de pâte et procédé de surveillance des parties internes d’un sécheur de pâte Download PDF

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Publication number
WO2010000938A2
WO2010000938A2 PCT/FI2009/050591 FI2009050591W WO2010000938A2 WO 2010000938 A2 WO2010000938 A2 WO 2010000938A2 FI 2009050591 W FI2009050591 W FI 2009050591W WO 2010000938 A2 WO2010000938 A2 WO 2010000938A2
Authority
WO
WIPO (PCT)
Prior art keywords
end wall
pulp dryer
pulp
elements
dryer
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.)
Ceased
Application number
PCT/FI2009/050591
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English (en)
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WO2010000938A3 (fr
Inventor
Johan Lindholm
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39589435&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2010000938(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Priority to AT09772625T priority Critical patent/ATE547560T1/de
Priority to BRPI0913998-2A priority patent/BRPI0913998B1/pt
Priority to EP09772625A priority patent/EP2326769B1/fr
Priority to CN200980125195XA priority patent/CN102076907B/zh
Priority to ES09772625T priority patent/ES2382675T3/es
Publication of WO2010000938A2 publication Critical patent/WO2010000938A2/fr
Publication of WO2010000938A3 publication Critical patent/WO2010000938A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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

Definitions

  • the invention relates to an end wall of a pulp dryer, a pulp dryer, and a method for observing the inner parts of a pulp dryer according to the preambles of the independent claims presented below.
  • a web formed of pulp i.e. a pulp web
  • the blow nozzles are arranged in several superimposed, generally horizontal nozzle levels having almost the length of the pulp dryer.
  • the pulp web is typically introduced into the pulp dryer through its first end, the so-called wet end. Normally, the pulp web enters the pulp dryer at its upper part, through an inlet opening arranged in the upper part of the end of the dryer. Then the pulp web is conveyed along the uppermost nozzle level of the pulp dryer to the second end of the dryer device.
  • the dryer is typically provided with turn rolls, over which the pulp web is turned each time to the next, lower nozzle level.
  • the pulp web is removed from the pulp dryer, typically through the second end of the pulp dryer.
  • the pulp web is removed from the pulp dryer at its lower part, through an outlet opening arranged in the lower part of the second end of the dryer.
  • a pulp dryer typically comprises 15 - 30 nozzle levels.
  • the gas blown from the blow nozzles is typically hot air, the blow air generally having a temperature of 120 - 170 0 C.
  • the pulp web When entering the pulp dryer, the pulp web typically has a dry solids content of 48 - 54%.
  • the dry solids content of the pulp web leaving the pulp dryer is typically 85 - 95%, most typically approximately 90%.
  • the pulp web can have a width of 12 m, typically 3 - 1O m, more typically 6 - 10 m.
  • the pulp web is typically conveyed at a speed of 140 - 220 m/min in the pulp dryer.
  • the pulp dryers are typically provided, at their both ends, i.e. end faces, with several rows of access doors, which rows are one above the other and comprise a number of several adjacent access doors.
  • the access doors are closed in a normal running situation of the pulp dryer, and in a maintenance situation, such as after a web break, the access doors can be opened. Via an access door, it is possible to perform operations for example at the turn rolls.
  • the pulp dryers are typically provided, at both ends, with a moving maintenance bridge having the width of the entire dryer, on which maintenance bridge an operator can work and from which he can reach the inner parts of the pulp dryer when one or more rows of access doors are opened.
  • An access door is normally hinged by its lower part to the end wall of the pulp dryer, and in an open position the access door "hangs" from its hinges and leans on to the end wall.
  • the access doors are traditionally rather low, i.e. their height is less than a half of the diameter of the turn roll. Due to this, performing of maintenance operations at the turn roll in case of a web break is difficult due to a low and narrow working space, and taking auxiliary equipment to the roll is difficult. At present, the operators need to bring the broke manually from the turn roll to a broke removal device of the movable maintenance bridge. This is time consuming, very unpleasant and hard work. There have been attempts to solve the problem by placing two low rows of access doors at the turn roll, of which rows one is partly above the roll and the other partly below it. However, this does not make it completely easier in all situations to perform the operations taking place inside the pulp dryer.
  • An object of the invention is to provide an end wall of a pulp dryer, which end wall enables a simple performing of the service and maintenance operations taking place at the turn rolls of the pulp dryer.
  • An object of the present invention is especially to provide a solution whereby the observing of the turn rolls of the pulp dryer for example during tail threading is considerably easier than at present.
  • a typical end wall of a pulp dryer according to the invention comprises an upper edge and a lower edge, the distance between which defines the height of the end wall, and between which upper and lower edges there is arranged
  • the end wall element being arrangeable to a closed and an open position in order to cover or to expose a turn roll located in the inner part of the pulp dryer, whereby the height of the openable end wall element is at least 50% of the distance between the axes of the pulp dryer's two turn rolls that are one above the other, adjacent and closest to each other and exposed in the open position.
  • an end wall element located in an end part of the pulp dryer is opened in order to expose a turn roll located in the inner part of the pulp dryer, whereby by opening one end wall element a height that is at least 50% of the distance between the axes of the pulp dryer's two turn rolls that are one above the other and exposed in the open position is exposed from the inner part of the pulp dryer.
  • a typical pulp dryer according to the invention comprises at least one end wall according to the invention.
  • An advantage of the invention is also that the possibility for observing the inner parts of a pulp dryer is considerably improved. Thus, for example in case of a web break, it is easier to notice any possible broke that has remained on the drying level of the pulp dryer.
  • By opening an end wall element according to the invention it is possible to observe an individual drying level even by the entire length and width of the pulp dryer in order to detect any possible additional material that has remained on the drying level.
  • an open position of an end wall element is meant a position in which the end wall element is arranged to expose parts of the inner part of the pulp dryer.
  • the end wall element in the open position may have been turned or folded away from the plane formed by the end wall, or it may have been transferred above or underneath the end of the pulp dryer, or to the side of the pulp dryer. This allows free observation of the inner part, or at least part of the inner part, of the pulp dryer.
  • a closed position of an end wall element is meant a position, in which the end wall element is arranged to cover the inner part of the pulp dryer. In the closed position, the end wall element is arranged to the same plane with other surfaces and/or wall elements forming the end face, so that a uniform end wall surface is formed.
  • the height of an end wall element is typically at least 65 %, preferably at least 70 %, more preferably at least 75 %, even more preferably at least 80 %, particularly preferably at least 85 %, and even more preferably at least 90 %, even at least 95 % of the diameter of an individual turn roll of the pulp dryer exposed in the open position of the end wall element.
  • the height of an openable end wall element is equal or larger than the diameter of the pulp dryer's turn roll exposed in the open position.
  • the height of the end wall element is typically at most 400 %, sometimes at most 300 %, sometimes at most 200 %, preferably at most 175 %, very preferably at most 160 %, more preferably at most 155 %, particularly preferably at most 150 %, even more preferably at most 140 %, typically at most 130 %, even more typically at most 120 %, most typically at most 110 % of the diameter of the pulp dryer's turn roll exposed in an open position.
  • the height of an end wall element is at least 50 cm, typically at least 60 cm, preferably at least 70 cm, even more preferably at least 90 cm, sometimes even at least 100 cm, or at least 200 cm.
  • the height of an openable end wall element is typically at least 65%, preferably at least 70%, more preferably at least 75%, even more preferably at least 80%, very preferably at least 85%, even more preferably at least 90%, even at least 95% of the distance between the axes of two turn rolls of the pulp dryer that are one above the other an exposed in the open position.
  • the height of the end wall element can be typically 100%, more typically 150%, even more typically 200%, preferably 300%, more preferably 400%, even more preferably 500%, very preferably even 600% of the distance between the axes of two adjacent turn rolls of the pulp dryer that are one above the other.
  • the present invention intended to be preferably used in modern pulp dryers, the web width of which is typically 7 - 10 meters, sometimes even 11 - 13 meters, and the height of which may even be 20 meters.
  • the height of an end wall element can thus even be several meters, usually > 2 meters, even 5 - 10 meters.
  • a pulp dryer thus comprises a number of drying levels which in turn comprise drying sections formed of drying means.
  • a pulp web is led to an air dryer normally at its upper part, the dry matter content of the web being approximately 45 - 55, typically 50% by weight.
  • the web is carried on a drying level preferably in a contact-free manner, for example by means of air blows generated by drying means.
  • the web is removed from the lower part of the air dryer, when its dry matter content is approximately 90% by weight.
  • one or two lowermost levels of the air dryer function as cooling levels of the web to be dried.
  • an air dryer
  • a maintenance bridge extending over the width of the pulp dryer, which bridge can be moved in the height direction of the pulp dryer and from which necessary maintenance operations of the inner parts and turn rolls of the pulp dryer can be performed.
  • a dryer suitable for drying a pulp web or the like comprises
  • So-called roll towers are located at the ends of a pulp dryer, to which towers mainly superimposed turn rolls have been arranged, by means of which turn rolls the web to be dried is turned from one drying level to the next. At the same, the travel direction of the web changes by 180°.
  • the axes of the rolls have been arranged to be parallel in the roll towers.
  • the turn rolls are usually of the same size, i.e. their diameters are equal.
  • the height of an end wall element can be substantially the same as the height of an end wall of the pulp dryer.
  • An individual end wall element then extends, in practice, from the lower edge or from near the lower edge of the pulp dryer's end part to the upper edge or near the upper edge of the pulp dryer.
  • the height of the end wall element can then be at least 65 %, preferably at least 75 %, more preferably at least 80 %, even more preferably at least 85 %, most preferably at least 90 %, even more preferably at least 95 %, even at least 97 % of the height of the end wall of the pulp dryer.
  • one or several openable end wall elements can be arranged.
  • Separate end wall elements can be arranged one above the other in the height direction of the end of the pulp dryer or they can be arranged side by side in the width direction of the end of the pulp dryer.
  • the end wall elements can be arranged to cover the entire end wall of the pulp dryer or they can be arranged at a distance from one another so that there is free end wall surface between them.
  • the end wall elements can all be of same size, or the end wall may comprise several end wall elements, for example on several levels one above the other, whereby the height of the end wall elements in different levels differs from one another, the height being, however, uniform on one level.
  • the end wall of the pulp dryer comprises several end wall elements of the same height.
  • all of the end wall elements being in an open position at least 55 %, typically at least 60 % of the area of the end wall is arranged to be open to the machine room.
  • This enables opening of the end wall of the pulp dryer by its major part or even entirely.
  • at least 65 %, preferably 75 %, most preferably 80 %, more preferably 85 %, even 90 %, sometimes even 95 % of the total area of the end wall of the pulp dryer can be arranged to be openable. This enables, inter alia, a faster cooling of the inner parts of the pulp dryer for example in case of a malfunction, whereby the maintenance operations taking place at the pulp dryer become quicker and easier to perform.
  • the entire outer surface of the end wall of the pulp dryer is formed by openable end wall elements. Then the end wall of the pulp dryer can be entirely opened for example during tail threading or during broke removal and cleaning after a web break. It has been estimated that performing of such operations becomes much quicker when the operators have the possibility to work freely in the vicinity of the turn rolls and when the events inside the dryer can be better observed as a whole. It is clear that, when the entire outer surface of the pulp dryer's end wall is formed of end wall elements, it is not always necessary to open the entire end wall of the pulp dryer. For example during tail threading, the process can be monitored by arranging a required number of the end wall elements to be in the open position.
  • An end wall element can be arranged to open in the sideward, i.e. width direction of the end wall against the height direction of the end wall.
  • One end wall element can comprise at least two, preferably more partial elements, such as three, four, five, six, eight or ten separate partial elements, which can be arranged in a closed or open position.
  • the partial elements can be arranged into connection with each other so that they are arranged to open simultaneously.
  • the partial elements of the end wall can be arranged into connection with each other, i.e. with adjacent partial elements, at the edges parallel with the height direction of the end part of the pulp dryer, so that they can be arranged to open in the manner of a folding door.
  • the end wall element opens in the width direction of the end of the pulp dryer, i.e. the opening movement of the elements occurs substantially horizontally in the direction of the upper and lower edges of the end.
  • An individual partial element of the end wall can be perceived to form an individual door leaf of the created "folding door".
  • the partial elements can be fixed to each other by suitable hinge means in order to open the end wall of the pulp dryer.
  • the end wall can comprise one end wall element, whereby substantially all of the turn rolls located in the end of the pulp dryer are exposed by moving said end wall element into an open position in the width direction of the end wall.
  • the end wall can also comprise two end wall elements, which are arranged to open into opposite directions in the width direction of the end wall.
  • individual partial elements of the end wall element can be arranged into connection with each other so that when opening the end wall the partial elements form a tambour door -like end wall element.
  • a tambour door -like end wall element can be arranged to open either in the height or the width direction of the end wall.
  • the partial elements that are in contact with each other can be moved into an open position for example on top of or under the pulp dryer, for example into the spaces located under the machine room space.
  • An end wall element can also be moved in the width direction of the end wall, whereby it is in an open position on the side of the pulp dryer.
  • Individual partial elements can also form two tambour door -like end wall elements, the first of which is moved into an open position on top of the pulp dryer and the other under the pulp dryer, or alternatively on both sides of the pulp dryer.
  • the partial elements of the end wall can be connected with suitable connection means to each other at the edges parallel with the width direction of the end wall, and an end wall element comprising partial elements can be arranged in an open position in the upper or lower part of the pulp dryer's end wall.
  • the end wall of a pulp dryer can also be divided into several separate sections, such as for example into two, three or four, sometimes even five sections, whereby an end wall element covering an individual section can be opened independently from the end wall elements covering the adjacent or other sections.
  • the end wall can be divided into sections either in the height or in the width direction of the end wall.
  • An individual section can be covered by one end wall element, which can comprise several partial elements, or an individual section can be covered by two end wall elements opening into opposite directions, which can both comprise several partial elements.
  • the end wall comprises at least two end wall elements one above the other, of which each end wall element comprises an equal number of partial elements. Then the partial elements located one above the other of the end wall elements can be arranged to be opened simultaneously in the height direction of the end wall. In this manner, a desired part of the turn rolls located in the end part of the pulp dryer can be exposed, for example during tail threading.
  • the end wall comprises guides for moving the end wall elements or the partial elements.
  • the end wall elements can be arranged to move along the guides so that they can be glided from a closed position to an open position or vice versa.
  • the edges of the end wall elements or of the partial elements can be provided with disc means of the like, which can be fitted in a recess, a groove or a corresponding guide means of the guides, and with which the elements can be moved.
  • the end wall element or its individual partial elements can be provided with hinges, which can be fixed to said guides.
  • the elements can be closed to a closed position, whereby they cover the turn rolls located in the end part of the pulp dryer and form a substantially planar surface, and opened to an open position, whereby the turn rolls located in the end part of the pulp dryer are exposed.
  • the end wall elements or the partial elements can be for example in an angle of 90 degrees with respect to their closed position.
  • the end wall elements or the partial elements of an end wall element can be arranged against each other, the main surfaces of the partial elements against each other in the open position.
  • the upper and lower edges of the end wall elements be provided with leading means, which are arranged to travel along the upper and lower guides arranged in the end part of the pulp dryer.
  • the end wall elements are moved away from the front of the turn rolls along the upper and lower guides in the width direction of the end part of the pulp dryer.
  • the end wall elements When the end wall elements are arranged on the side of the end part, they can be arranged in an open position so that the leading means of the first upper and lower edge of the end wall elements are released from the upper and lower guides, whereby the end wall elements are connected to the upper and lower guides only via the leading means of their second edge.
  • the end wall elements can then be arranged for example against each other, the main surfaces against each other perpendicular to the height and width directions of the end wall.
  • the leading means can be arranged in the upper and lower edge of an end wall element or of a partial element so that the element/elements can be turned by, for example, 90 degrees around the axis traversing the leading means.
  • the turned elements can be arranged along a guide means away from the turn rolls for example into the edge of the dryer. Then the element/elements are arranged partly inside the pulp dryer in an "open" position, which saves space in the machine room.
  • end wall elements are not entirely detached from the supporting structures of the end wall of the pulp dryer or from the guide or supporting structures.
  • End wall elements can for example be moved along different guides or guide means, or they can be folded to an edge of the end wall, but usually, some part of the end wall element remains in contact with the end wall or the supporting structure and connected to it.
  • it is thus possible to allow easy and light moving of considerably large end wall elements between open and closed positions. This improves the ergonomic working conditions of the operating personnel, especially when the work is done on a maintenance bridge moving in the height direction of the end wall.
  • the end wall element can be made of two parts, i.e. it can be double-walled, whereby the end wall element comprises an outer surface or wall parallel to the end wall, and an inner surface or wall parallel to the outer surface or wall, between which walls or surfaces heat insulation medium is arranged.
  • the thermal insulation medium can be an insulation material made from mineral fibers, such as glass wool or rock wool, stationary insulating gas, such as air, or a vacuum.
  • gas preferably dry and cool air from the machine room
  • gas can be blown into the space located between the inner and outer walls of the double-walled end wall element.
  • air from the machine room is blown to the space located between the walls of the double-walled end wall element, this air cools the inner wall in contact with the inside of the pulp dryer.
  • the surface of the inner wall is cool.
  • a controlled condensation takes place, and a part of the moisture of the indoor air of the pulp dryer condenses on the wall surface wherefrom it can be removed with suitable removal arrangements.
  • To the lower part of the end wall element may have been arranged for example a trough-like guide to which the condensed moisture flows along the wall surface and along which trough the condensed moisture can be removed from the inner part of the pulp dryer.
  • a trough-like guide to which the condensed moisture flows along the wall surface and along which trough the condensed moisture can be removed from the inner part of the pulp dryer.
  • air is led to the outer wall facing the machine room of the double- walled end wall element through an inlet slot or opening arranged at a first height into the end wall element, to the intermediate space between its inner and outer walls.
  • the air is led in the intermediate space towards an outlet slot or opening arranged to the inner wall, facing the inner part of the dryer, of the end wall element, which slot or opening is arranged at a different height from the inlet slot or opening, preferably higher than the inlet slot or opening.
  • the air travels in the intermediate space defined by inner and outer walls of the end wall element, it cools down the inner wall and simultaneously itself warms up, so that the air entering through the outlet slot to the inner part of the pulp dryer is warmer than the air in the machine room.
  • pre-heating of the drying and replacement air to be introduced to a pulp dryer and drying of the indoor air of a pulp dryer by means of a controlled condensation on the inner surface of the end wall element can easily be achieved simultaneously. It is also possible to lead cooled air into a double-walled end wall element, the temperature of which air is substantially lower than the temperature of the air in the machine room. Typically, the temperature of the air in the machine room is 20 - 3O 0 C, and the temperature of the air in the inner part of a pulp dryer is approximately 100 0 C. The temperature of the cooled air can for example be 10 - 15°C. Materials in use at present, such as steel, can be used as the material of the end wall element.
  • the end wall element or its individual partial elements are however made, at least partly, of a substantially transparent material, such as glass or plastic.
  • a substantially transparent material such as glass or plastic.
  • the end wall element comprises one or several end wall elements that are made of entirely or almost entirely transparent material. This enables observing of the pulp dryer's turn rolls also during the operation of the pulp dryer. Thus, the operators are able to react faster and at an earlier stage to possible problems arising at the turn rolls.
  • the end wall element can also be made of a flexible material, such as plastic or rubber, whereby it can be rolled up into an open position.
  • first, second or both end walls of the pulp dryer can comprise any of the solutions according to the invention.
  • the sizes of the end wall elements or their partial elements can be standardized.
  • the end wall of the pulp dryer can be made by combining standardized end wall elements or their partial elements. Pulp dryer ' s end walls of a different size can therefore be made of individual elements of a same size by combining them- in an appropriate manner. Then it is not any more necessary to tailor a suitable end wall for each pulp dryer right from the beginning, which naturally provides savings in the planning and manufacturing costs.
  • the end wall elements or their partial elements are arranged to open so that in the open position they will not hinder the opening of the adjacent or other end wall elements or partial elements.
  • the end wall elements or their partial elements do not preferably also cover the view into the inside of the pulp dryer exposed from behind the adjacent end wall elements or their partial elements, which are in the open position.
  • sealing means are arranged to the edges of an end wall element or of its partial element, with which sealing means a gap-like space possibly located between the edges of adjacent elements or partial elements can be sealed and closed for minimizing the thermal losses.
  • partial elements forming one end wall element have not been connected fixedly to each other, but they are sealed to each other with sealing means.
  • Figure 1 shows a part of an end wall according to an embodiment of the invention
  • Figure 2 shows a part of an end wall according to another embodiment of the invention
  • Figures 3A - 3E show an end wall element's opening mechanism according to a further embodiment of the invention as seen from above,
  • Figure 4 shows an end wall element's opening mechanism according to still a further embodiment of the invention as seen from above
  • Figures 5A and 5B show a pulp dryer, which is provided with ends according to an embodiment of the invention as seen from the side
  • Figures 6A - 6C show an end wall element's opening mechanism according to a further embodiment of the invention as seen from above.
  • Figure 1 shows a part of a pulp dryer's end wall according to an embodiment of the invention.
  • the figure shows two end wall elements 2, 2', of which the first end wall element 2 can be arranged into an open position to the tending side of the pulp dryer and the second end wall element 2' can be arranged into an open position to the driving side of the pulp dryer.
  • the opening directions of the end wall elements 2, 2' are indicated by arrows a, a' in figure 1.
  • the end wall element 2 comprises four partial elements 3, 3', 3", 3'", which are arranged to open into the tending side in the manner of a folding door.
  • Two partial elements 3, 3" are provided with transfer means 4, 4', such as gripping handles, with which the partial elements can be transferred from a closed position to an open position.
  • the second end wall element 2' comprises six partial elements opening in the manner of a folding door.
  • the individual partial elements are fixed to each other by hinge means 5, 5', 5".
  • the partial elements are arranged to travel along the guiding means 6, 6' arranged at the upper and lower edges of the partial elements.
  • the upper and/or lower edges of the partial elements are provided with leading means (not shown), which are arranged into connection with the guiding means 6, 6' so that the partial elements can be moved along the guiding means.
  • the end wall elements 2, 2' enable servicing measures at two turn rolls 7, 7' of the pulp dryer one above the other.
  • the height of the end wall elements 2, 2' is about two times the distance b between the axes of rolls that are one above the other.
  • Figure 2 shows a part of an end wall 1 according to another embodiment of the invention, comprising four end wall elements 22, 22', 22", 22'".
  • Each of the individual end wall elements 22, 22', 22", 22'" comprises two partial elements 23, 23'.
  • the end wall elements are arranged one above each other in two levels 11 , 11' so that the partial elements 23', 23' of the first upper 11 and the second lower 11' levels are one above the other.
  • the end wall elements 22, 22" can be arranged simultaneously into an open position, if necessary, whereby the second edge of the pulp dryer is exposed for observing.
  • the end wall elements 22, 22" can be arranged into an open position on the tending side of the pulp dryer and the end wall elements 22', 22'" can be arranged into an open position on the driving side of the pulp dryer.
  • the opening directions of the end wall elements 22, 22' of the first level 11 are indicated by arrows a, a' in figure 2.
  • the end wall elements 22", 22'" of the second level 11 ' are opened in a corresponding manner.
  • Each individual end wall element 22, 22', 22", 22'" can also be arranged into an open position independently from each other.
  • the partial elements 23, 23" are provided with transfer means in a manner corresponding to that of figure 1.
  • the end wall elements 22, 22' enable service operations at four turn rolls 27, 27', 27", 27'" of the pulp dryer one above the other.
  • the height of the end wall elements 22, 22', 22", 22'" is about four times the distance b between the axes of rolls that are one above the other.
  • the partial elements of the end wall elements can be made of a substantially transparent or translucent material. Thus, it is possible to observe the turn rolls by visual inspection without arranging the end wall elements into an open position.
  • Figures 3A - 3E show an end wall element's opening mechanism according to a further embodiment of the invention as seen from above.
  • Figure 3A shows an end wall element 32 comprising several partial elements 33, 33', 33", 33'" in a closed position, i.e. the end wall element is arranged to cover at least a part of the inner part of the pulp dryer.
  • the partial elements 33, 33', 33", 33'" are connected to each other by hinge means 35, 35', 35", 35'" via their lateral edges, which are parallel with the height direction of the pulp dryer.
  • transfer means 34, 34' In connection with some hinge means 35, 35" there are arranged transfer means 34, 34' with which it is easier to move the partial elements 33, 33', 33", 33'” when arranging the end wall element into an open position.
  • end wall element 32 is entirely arranged in an open position their main surfaces against each other, preferably on the side of the pulp dryer, on the tending side or on the driving side.
  • Figures 4A and 4B show an end wall element's opening mechanism according to a further embodiment of the invention as seen from above.
  • the end wall element 42 comprises four partial elements 43, 43', 43", 43'", which are connected to each other by hinge means 45, 45', 45".
  • the end wall element 42 also comprises transfer means 44, 44'.
  • the guiding means 48, 48', 48", 48'" are however arranged in the upper and/or lower edge of the partial element 43, 43', 43", 43'", however not at the hinge means 45, 45', 45".
  • the guiding means 48, 48', 48", 48'" are arranged in the middle of the edge of an individual partial element 43, 43', 43", 43'", but it is clear that they can be arranged also to some other location in the edge of the partial element, if desired.
  • Figure 4A shows the end wall element 42 in a closed position, whereby it covers the turn roll or turn rolls located in the end of the pulp dryer.
  • the end wall element 42 is arranged in an open position, which enables observing of the inner parts of the pulp dryer.
  • the partial elements 43, 43', 43", 43" are arranged in the end part of the guiding means 46 by moving the leading means 48, 48', 48", 48'" along the guiding means 46 in the width or the height direction of the pulp dryer.
  • the partial elements 43, 43', 43", 43" are turned in the open position partly into the pulp dryer. This is advantageous if there is very little space around the pulp dryer, whereby the end wall element in an open position could disturb working in the end of the pulp dryer.
  • Figures 5A and 5B show a pulp dryer, which is provided with ends according to an embodiment of the invention as seen from the side.
  • the pulp web A is taken into the pulp dryer 1 , into its wet first end 1' via an inlet opening 51 located in the upper part of the dryer.
  • the pulp web A travels form the first end 1' of the dryer to the second end 1", where its travelling direction is turned by 180° by means of a turn roll 57.
  • both ends 1', 1" of the dryer 1 there are arranged a plurality of parallel turn rolls 57' one above the other, by means of which the web A is turned so that it travels back and forth inside the pulp dryer 1.
  • the web A is removed from the pulp dryer 1 by its second end 1" via an outlet opening 51' located in the lower part of the pulp dryer.
  • a movable maintenance platform 59, 59' is arranged in both ends 1', 1" of the pulp dryer 1.
  • the maintenance platform 59, 59' can be moved in the end 1', 1" of the pulp dryer 1 in the height direction of the pulp dryer, and maintenance operations required by the pulp dryer can be performed from it.
  • the end wall elements 52, 52' of the pulp dryer are arranged in a closed position.
  • the end wall elements 52, 52' of the pulp dryer 1 are arranged in an open position so that the end wall element 52 of the wet first end 1' of the pulp dryer is arranged under the bottom level 12 of the pulp dryer 1 , in a storage space 61 arranged between the bottom level 12 of the pulp dryer and the floor 60.
  • the end wall element 52' of the second end 1" of the pulp dryer 1 is, in turn, arranged above the roof level 13 of the pulp dryer.
  • the end wall elements 52, 52' which are in an open position do not occupy the valuable machine room space and do not substantially disturb the maintenance and service operations performed around and in the ends of the pulp dryer 1.
  • Figures 6A - 6C show an end wall element's opening mechanism according to an embodiment of the invention as seen from above.
  • Figure 6A shows an end wall element 62 comprising several partial elements 63, 63', 63" in a closed position, whereby the end wall element 62 is arranged to cover at least a part of the inner part of the pulp dryer.
  • the partial elements 63, 63', 63" are not connected to each other in an fixed manner, but they are provided with sealing means 69, 69', 69" with which a gap-like space 64, 64' eventually between the lateral edges of the partial elements 63, 63', 63" can be sealed and closed.
  • An individual partial element 63, 63', 63" is formed of two parallel sides 70, 70' the space 71 between which sides can be filled with an insulating medium, such as for example gas, such as air.
  • the parallel sides can be arranged to be substantially transparent in order to enable the observing of the inner parts of the pulp dryer.
  • the partial elements 63, 63', 63" are provided with hinge means 65, 65', 65" with which the partial elements 63, 63', 63" can be moved along a guiding means (not shown) while the end wall element is arranged into an open position.
  • the hinge means are arranged to move along a guiding means.
  • the partial elements 63, 63', 63" can also be turned by 90 degrees, whereby they can be arranged on the side of the pulp dryer, on the tending or driving side, as efficiently as possible with regard to use of space.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne la paroi terminale d’un sécheur de pâte, qui comporte un bord supérieur et un bord inférieur, la distance entre lesdits bords définissant la hauteur de la paroi terminale. Une ouverture servant à introduire la bande de pâte dans le sécheur de pâte ou à extraire la bande du sécheur de pâte est pratiquée entre les bords supérieur et inférieur. Un ou plusieurs éléments ouvrants de paroi terminale servant à surveiller les parties internes du sécheur de pâte et à effectuer des opérations de maintenance sont disposés entre les bords supérieur et inférieur, le ou les éléments de paroi terminale pouvant être placés en position fermée ou ouverte afin de recouvrir ou de découvrir un rouleau rotatif situé dans la partie interne du sécheur de pâte. La hauteur de l’élément ouvrant de paroi terminale représente au moins 50% de la distance entre les axes de deux rouleaux rotatifs du sécheur de pâte situés l’un au-dessus de l’autre et découverts en position ouverte. L'invention concerne également un sécheur de pâte et un procédé de surveillance des parties internes du sécheur de pâte.
PCT/FI2009/050591 2008-06-30 2009-06-30 Paroi terminale d’un sécheur de pâte, sécheur de pâte et procédé de surveillance des parties internes d’un sécheur de pâte Ceased WO2010000938A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT09772625T ATE547560T1 (de) 2008-06-30 2009-06-30 Stirnwand eines zellstofftrockners, zellstofftrockner sowie beobachtungsverfahren für die innenteile eines zellstofftrockners
BRPI0913998-2A BRPI0913998B1 (pt) 2008-06-30 2009-06-30 parede da extremidade de um secador de polpa, secador de polpa e método para observar as partes internas de um secador de polpa
EP09772625A EP2326769B1 (fr) 2008-06-30 2009-06-30 Paroi terminale d'un sécheur de pâte, sécheur de pâte et procédé de surveillance des parties internes d'un sécheur de pâte
CN200980125195XA CN102076907B (zh) 2008-06-30 2009-06-30 浆幅干燥器的端壁、浆幅干燥器以及用于观察浆幅干燥器内部的方法
ES09772625T ES2382675T3 (es) 2008-06-30 2009-06-30 Pared final de un secador de pulpa, secador de pulpa, y método para observar las partes interiores de un secador de pulpa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20085674A FI124682B (fi) 2008-06-30 2008-06-30 Sellukuivaimen päätyseinä, sellukuivain ja menetelmä sellukuivaimen sisäosien tarkastelemiseksi
FI20085674 2008-06-30

Publications (2)

Publication Number Publication Date
WO2010000938A2 true WO2010000938A2 (fr) 2010-01-07
WO2010000938A3 WO2010000938A3 (fr) 2010-04-22

Family

ID=39589435

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2009/050591 Ceased WO2010000938A2 (fr) 2008-06-30 2009-06-30 Paroi terminale d’un sécheur de pâte, sécheur de pâte et procédé de surveillance des parties internes d’un sécheur de pâte

Country Status (8)

Country Link
EP (1) EP2326769B1 (fr)
CN (1) CN102076907B (fr)
AT (1) ATE547560T1 (fr)
BR (1) BRPI0913998B1 (fr)
ES (1) ES2382675T3 (fr)
FI (1) FI124682B (fr)
UY (1) UY31946A (fr)
WO (1) WO2010000938A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140323A1 (fr) 2011-04-14 2012-10-18 Metso Paper, Inc. Procédé permettant d'observer des incidents dans une zone de partie d'extrémité d'un séchoir à pulpe, séchoir à pulpe et utilisation d'un élément de surveillance
WO2015173080A1 (fr) * 2014-05-12 2015-11-19 Voith Patent Gmbh Dispositif de fermeture pour capot de séchage
US12403083B2 (en) 2021-08-30 2025-09-02 The Procter & Gamble Company Dissolvable solid structure comprising first and second polymeric structurants

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI126860B (fi) * 2015-06-05 2017-06-30 Valmet Technologies Inc Sellukuivaimen päätyseinä ja sellukuivain

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GB687805A (en) * 1950-11-29 1953-02-18 Alfred George Pollner Improvements in roller shutters
GB783991A (en) * 1954-04-29 1957-10-02 Kurt Brunnschweiler An enclosure for drying machines or the like
US4141403A (en) * 1978-06-16 1979-02-27 Church Rocco L Garage-patio door
FI112266B (fi) * 1997-04-11 2003-11-14 Metso Paper Inc Keraamipinnoitteinen puristintela vaikeisiin korroosio-olosuhteisiin, menetelmä telan valmistamiseksi ja pinnoitekoostumus
AT413709B (de) * 2004-06-28 2006-05-15 Andritz Ag Maschf Vorrichtung zum kontinuierlichen trocknen einer faserstoffbahn
FI119153B (fi) * 2006-11-14 2008-08-15 Metso Paper Inc Ilmakuivaimen päätyosa, ilmakuivain, menetelmä ilmakuivaimen päätyosassa ja puhaltimen käyttö
DE202007016891U1 (de) * 2007-12-03 2008-02-14 Langbein & Engelbracht Gmbh Trockenhaube

Non-Patent Citations (1)

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Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140323A1 (fr) 2011-04-14 2012-10-18 Metso Paper, Inc. Procédé permettant d'observer des incidents dans une zone de partie d'extrémité d'un séchoir à pulpe, séchoir à pulpe et utilisation d'un élément de surveillance
WO2015173080A1 (fr) * 2014-05-12 2015-11-19 Voith Patent Gmbh Dispositif de fermeture pour capot de séchage
US12403083B2 (en) 2021-08-30 2025-09-02 The Procter & Gamble Company Dissolvable solid structure comprising first and second polymeric structurants

Also Published As

Publication number Publication date
CN102076907A (zh) 2011-05-25
UY31946A (es) 2010-01-29
FI124682B (fi) 2014-12-15
WO2010000938A3 (fr) 2010-04-22
ES2382675T3 (es) 2012-06-12
FI20085674A0 (fi) 2008-06-30
FI20085674L (fi) 2009-12-31
BRPI0913998B1 (pt) 2019-11-05
CN102076907B (zh) 2012-07-18
EP2326769A2 (fr) 2011-06-01
BRPI0913998A2 (pt) 2015-10-20
EP2326769B1 (fr) 2012-02-29
ATE547560T1 (de) 2012-03-15

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