EP0647286A1 - Cylindre chauffant - Google Patents

Cylindre chauffant

Info

Publication number
EP0647286A1
EP0647286A1 EP94914416A EP94914416A EP0647286A1 EP 0647286 A1 EP0647286 A1 EP 0647286A1 EP 94914416 A EP94914416 A EP 94914416A EP 94914416 A EP94914416 A EP 94914416A EP 0647286 A1 EP0647286 A1 EP 0647286A1
Authority
EP
European Patent Office
Prior art keywords
roller
heating roller
heating
condensate
lines
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.)
Granted
Application number
EP94914416A
Other languages
German (de)
English (en)
Other versions
EP0647286B1 (fr
Inventor
Heinz-Michael Zaoralek
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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 Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP0647286A1 publication Critical patent/EP0647286A1/fr
Application granted granted Critical
Publication of EP0647286B1 publication Critical patent/EP0647286B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F5/00—Elements specially adapted for movement
    • F28F5/02—Rotary drums or rollers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • D21F5/028—Heating the cylinders using steam
    • 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
    • D21F5/10—Removing condensate from the interior of the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid

Definitions

  • the invention relates to a heating roller for web-like materials, in particular paper, with a cylindrical roller body and at least one, preferably two flange journals, which are each connected to opposite ends of the cylindrical roller body.
  • At least one supply or discharge line for a heating medium runs through at least one of the flange pins.
  • the heating medium in particular water vapor, is passed through the heating roller through at least one at least approximately axially parallel, preferably peripheral bore or line.
  • the bores or lines are preferably connected to at least one connection space or at least one connection line to the supply and discharge lines.
  • Such heating rolls as also described in the preamble of claim 1, are often rolls with a more or less solid roll body, in which a larger number of axial bores mostly close to the roll surface, i.e. are introduced peripherally, a heating medium flowing through these peripheral bores or lines and releasing its thermal energy to the walls of the bores or lines and thus to the roller surface.
  • Another type of roller has a tubular roller body in which the heating medium is passed through the hollow interior of the roller body and thereby releases its thermal energy to the interior of the roller body.
  • the generic heating roller type can be used for liquid heating media, such as some water and thermal oil, but has so far not been considered for a particularly advantageous heat transfer medium, namely water vapor.
  • a particularly advantageous heat transfer medium namely water vapor.
  • the water vapor condenses at least partially within the bores or lines, whereby it emits its heat for the most part or as a whole to the roll body, the roll surface and thus to the web-like material to be processed.
  • the resulting condensate is pressed outwards by the centrifugal forces that usually occur in paper processing machines, such as release supercalenders, etc., so that the condensate cannot flow away.
  • the holes are increasingly filled with condensate during operation until the entire holes are finally closed by water.
  • the throughput of water vapor and, in parallel, the heating output of the heating roller is practically zero.
  • the known heating roller of the generic type would have to be braked to such an extent that the centrifugal or centrifugal forces are no longer sufficient to retain the water in the bores or lines.
  • a known roller of the generic type would even have to be brought to a standstill in order to allow the condensate to run off at least from the bores lying at the top.
  • water vapor as a heating medium has so far not been considered for the generic roller type.
  • water vapor is an ideal heating medium, since it always condenses inside the roller and releases its heating power at the coldest points.
  • This property of the heating medium itself ensures that there is always an approximate or precisely coordinated uniform temperature profile over the surface essential for the processing of the web-like material or over the entire surface of the heating roller.
  • the generic roller has a significant cost advantage over the roller of the other type, namely in that the heating rollers of the other type have a very large cavity located in the roller body, and therefore in many countries, e.g. the USA, subject to particularly complex acceptance conditions, since they are considered to be pressure vessels.
  • the water vapor pressure is approximately 20 bar at a temperature of approximately 211 ° C. and approximately 40 bar at a temperature of approximately 249 ° C.
  • these complex acceptance conditions do not apply to containers that have an inside diameter of less than 6 inches, namely less than approx. 152.4 mm, with each of the individual axial bores or lines of the generic roller type being defined when defining the container a single container is viewed.
  • the object of the present invention to develop a roller of the generic type in such a way that it can at least substantially overcome the disadvantages of the heating roller according to the prior art; in particular, the generic roller is to be developed in such a way that it can be operated at least partially with gaseous heating media, in particular water vapor.
  • the advantages which can be achieved with the present invention are based on the fact that at least one collecting space for receiving the condensate of the heating medium, preferably water vapor, is arranged in the heating roller.
  • heating rollers for super calenders or release super calenders which are preferably operated with steam, can also be designed in accordance with the generic type of roller, as a result of which the costly acceptance conditions and the associated demands on the rollers become obsolete.
  • water vapor is available in every conventional paper mill, so that in the case of direct steam heating, an additional heating station with a heat exchanger for converting steam energy into hot water and a separate circulation pump for the heating medium can be dispensed with.
  • the essential advantage of the generic roller namely that the bores or lines lie very close to the roller surface, so that the heat transfer is very cheap, can be combined with the favorable acceptance conditions, since the bores have a smaller inner diameter than 6 inches or 152.4 mm, so that the water vapor-carrying holes or lines are no longer regarded as pressure vessels, the expensive steel mostly used in connection with the difficult acceptance conditions can be dispensed with, and cheaper cast iron can be used.
  • the roller according to the invention provides a much higher surface temperature than a displacement roller, that is to say a roller of the type, at a predetermined steam temperature.
  • controllability of the heating power of the heating roller according to the invention is extremely variable and adjustable from zero to a maximum heating power, which will be discussed in more detail below.
  • the sealing heads for the flange connections required for the heating roller according to the invention can be made much smaller since, among other things, the amount of condensate at a heating power of 100 kW is only about 3 1 per minute. In addition, it is not necessary to place additional strain on the sealing heads due to the dynamic pressure of a pump which is arranged within a circuit for a heating medium. Ultimately, no additional energy expenditure for heating the movement of the heating medium is required. Very high temperatures, which are associated with correspondingly high pressures, can be achieved with the heating roller according to the invention. Since sealing heads are available that can hold up to 17 bar, temperatures around 207 ° C can be put into practice without any problems.
  • the collecting space can advantageously have a circumferential annular space on at least one of the axial end regions of the roller body and / or in the region at least have one of the flange pins.
  • This annular space should be arranged opposite the bores or lines in such a way that the centrifugal forces or centrifugal forces cause the condensate that accumulates within the bores to be pressed into the surrounding annular space or spaces, from where the condensate, in particular Water that can be easily removed.
  • Each bore can advantageously be assigned an annular space which has a corresponding arrangement in order to absorb the condensate via the effect of the centrifugal force.
  • each of the collecting spaces is connected to a discharge opening for the condensate via an outlet, for example in the form of at least one bore or at least one tube.
  • This discharge opening for the condensate can be identical to the supply or discharge for the heating medium, in particular water vapor, but should in any case be provided in the end regions of the heating roller and in particular through one or both flange pins of the heating roller.
  • an axially parallel, generally central bore can preferably be passed through the roller body, through which the heating medium, in particular water vapor, is directed to the other end of the heating roller or the roller body is, so that uniform amounts of steam with uniform temperature can act from both sides of the roller body.
  • the temperature of the heating roller according to the invention is advantageously regulated via the outflow quantity of the condensate.
  • Such regulation can be make a valve device that could be arranged outside the heating roller according to the invention itself.
  • roller according to the invention it is not possible to simply restrict the steam supply, but the above-mentioned regulation of the condensate drainage via a valve located outside the roller enables the roller temperature to be continuously increased over the entire temperature range up to the maximum operating temperature of the heating roller according to the invention regulate.
  • the bores or lines which are arranged near the roller surface, increasingly fill with condensate or water, which is not or only partially drained off. In this way, the amount of water held in the holes increases and the free surface area of the holes that can absorb the heat from the condensing steam decreases. In this way, the roller can with an increasing amount of condensate in the bores or lines absorb a smaller amount of heat so that the heating power of the roller according to the invention is possible by regulating the amount of condensate flowing off.
  • the bores or the lines can also be inclined slightly outwards from the center. The bores or lines can either deviate from the axial parallel towards the center of the roll by approximately 1 to 10 mm or can also run exactly axially parallel.
  • At least one of the collecting spaces has at least one end of the holes or lines or a respective hole or line with a rounded pocket with a diameter that is preferably smaller than the diameter of the peripheral hole, the pocket being opposite the peripheral hole or the line can be offset to the outside.
  • This can prevent the condensate located in the bores or lines near the roller surface in the event of the loss of centrifugal forces acting on the condensate in a surge from the bores or lines in the upper region of the roller through the steam-supplying connecting lines or connecting bores flows into the bores or lines of the lower region of the roller according to the invention.
  • the condensate cannot accumulate excessively in the lower region of the stationary roller, in order in this way to produce an uneven temperature profile over the diameter of the roller or over the circumference of the roller to lead so that relevant tension and bending of the roller body can be prevented even at a standstill.
  • the steam supply lines must of course be attached in such a way that they open into the collecting space in such a way that there is an obstacle to the otherwise draining condensate.
  • the at least substantially axially parallel peripheral bores or lines should pass into the collecting or annular spaces or pockets in such a way that no operating obstacles arise for the condensate flowing from the bores into the annular space or the pocket.
  • connection to the drain for example in the form of at least one hole or at least one tube, should be provided in such a way that no condensate congestion can form here either.
  • the condensate flow within the drain lines through which the condensate must pass.
  • a retention device preferably within the bores or lines or within the connection spaces or the connection lines at the end areas of a respective hole or line Check valve, non-return flaps or the like.
  • the end regions of the bores adjoining the respective collecting spaces should be surrounded by a heat-insulating material.
  • the roller designed according to the invention can be used not only for the release supercalenders already mentioned above, but also in so-called gloss or soft calenders, in which one or more plastic-coated rollers press the paper web against a heated roller, the surface temperatures usually not higher than must be around 160 to 170 ° C.
  • the outstanding advantage of the roller according to the invention lies in the fact that in each of the bores and at every point of the bores or the roller body there is an almost identical vapor pressure and thus almost the same temperature. Even the slightest temperature deviations along a bore or along the roller body mean that more steam condenses at this point, releases a large part of its energy during the condensation, and thus the temperature at this point is adjusted again. Far less steam condenses at adjacent points, so that an area that is too cold is automatically heated up.
  • the heating of the heating roller according to the invention for which preferably steam is possible, there is also the advantageous possibility of regulating the temperature of the incoming steam by moistening the steam pressure.
  • the steam that can be introduced into the heating roller according to the invention can be saturated or even saturated with moisture, so that in the latter case the heating steam is present as saturated steam.
  • FIG. 1 shows a detail from an axial longitudinal section through a roller according to the invention in an end region of the heating roller according to the invention
  • FIG. 2 shows a partial cross-sectional representation in a region of the heating roller designed according to the invention in one of its end regions;
  • Figure 3 is a flow diagram for the steam supply or condensate removal with respect to the heating roller according to the invention.
  • the heating roller designed according to the invention is generally identified by reference number 10.
  • the roller has a flange pin 12, preferably on each side, and a cylindrical roller body or roller jacket 14, the surface 11 of which is used for the pressure processing of a web-like material, in particular paper, plastic or the like.
  • a heating medium is introduced into the heating roller 10 according to the invention via a feed line running through the flange 12.
  • the incoming water vapor is introduced into connecting lines 24, and part of the water vapor introduced via the supply line 36 is led to the other end of the heating roller 10 via an axially parallel line 20 arranged in the central region of the roller 10 according to the invention.
  • the water vapor passes via the connecting line 24 to the collecting space 28, in which water vapor condensate can accumulate during the operation of the heating roller 10 according to the invention, that is to say when sufficient centrifugal forces occur.
  • the collecting space 28 connects to the at least approximately, preferably substantially exactly axially parallel bores or lines 16. In each case one collecting space 28 can be assigned to one bore or line 16. On the other hand or in addition, a circumferential collecting space could also be assigned to all the bores 16.
  • the collecting space 28 is provided in the flange 12 connected to the roller body 14 via fastening means 32.
  • it could equally well be arranged in the end region of the roller body 14.
  • the plenum 28 is axially offset from the central axis of the associated bore 16. This is to prevent the condensate from running off through the connecting line 24 into the lower region of the heating roller 10 according to the invention during slow running or standstill of the roller, as a result of which uneven temperature profiles, diameter deviations and an adverse influence on the web-like material to be processed can occur.
  • the design of the collecting space 28 with a smaller diameter and the axial displacement creates an obstacle 38 which prevents the condensate from flowing off the feed 24 prevented.
  • Part of the steam is guided to one of the corresponding line arrangements shown in FIG. 1 or in FIG. 2 on the opposite side of the heating roller 10 and from there in the opposite direction into the drilling portions by the boring 20 arranged centrally and axially parallel within the heating roller 10 according to the invention or lines 16 and thus introduced into the roller body 14 in order to achieve an even temperature profile in this way.
  • Insulations 30 are arranged in the edge region or in the end region of the bores 16 in order to bring about a thermal decoupling of the condensate, which can be contained within the collecting space 28.
  • further insulation can be provided in the border area between the flange pin 12 and the roller body 14, e.g. on the side of the flow obstacle 38 pointing toward the roller body 14.
  • a boring or a tube 26 is provided which is connected to the collecting space 28.
  • the condensate is conveyed from the collecting space 28 into a condensate collecting space 22 and from there into a condensate drain line 18 via this tube 26.
  • the condensate can be conveyed via the steam pressure or via a negative pressure applied to the space 22 and thus to the line 18.
  • a radial channel can be drilled into the flange 12, the tube 26 can be inserted into this resulting radial channel, closed to the outside by means of a closure 34 and fixed within the channel.
  • the tube 26 has an opening 27 which extends as far as possible to the radially outer end of the collecting space 28 in order not to form an obstacle for the condensate.
  • retention devices such as a check valve or the like may be provided in order to prevent the condensate from flowing off and the condensate from accumulating in the lower region of the roller 10 according to the invention when the roller according to the invention is at a standstill or running slowly.
  • the flow obstacle 38 according to FIG. 1 is not absolutely necessary, so that the connecting line 24 can also open directly into the bore 16 without having a direct connection to the collecting space 28.
  • annular spaces can also be provided at the roller ends, which are connected to all peripheral Bohmngen 16 and via which the distribution of the steam and from which the condensate is removed in the manner according to the invention.
  • a valve device can be provided following the line 18, via which the condensate outflow and thus the temperature of the roller can be controlled, the condensate being driven via the flow path shown above, driven by the centrifugal force and / or the vapor pressure and / or a suction created from outside can be withdrawn.
  • the condensate collection spaces 22 can also be located in the flange spigot 12, through which the condensate can reach the central axially located line 18.
  • central axial line 18 is to be dispensed with, it is advantageous if the water vapor can be conducted via supply and discharge lines 36 provided in both flange journals 12.
  • FIG. 2 shows a partial cross section through a heating roller designed according to the invention, from which in particular the position of the collecting space 28 for the condensate, which is offset to the drilling or line 16, can be seen.
  • the necessary parts such as the collecting space 28 and the parts connected to the pipe 26, are not shown, in addition to the parts required in connection with the vertically oriented connecting line 24 stand to emphasize again separately.
  • FIG. 3 shows a possible circuit for a roller 10 according to the invention.
  • the supply of heating medium or steam to the heating roller 10 according to the invention can be controlled via a supply line 40 and a steam shut-off valve 42 which controls the supply line.
  • the water vapor which is preferably introduced into the heating roller 10 according to the invention is, if appropriate, partially moistened or completely saturated after a pressure release, so that the water vapor supplied to the heating roller 10 is saturated steam or saturated steam.
  • the embodiment shown indicates that the water vapor through one Flange pin supplied to the roller 10 according to the invention and the condensate with or without steam content is removed from the opposite flange of the heating roller 10 according to the invention.
  • a discharge line 44 for the condensate is optionally provided with steam admixture on the outflow side.
  • the circuit has a condensate separator 46, which works in one of the known ways.
  • a bypass valve 48 is arranged parallel to the condensate separator and can be provided, for example, for safety purposes.
  • the circuit for a heating medium for the heating roller 10 according to the invention has a condensate control valve 50, by means of which the amount of condensate which is removed from the heating roller 10 can be controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un cylindre chauffant pour des matériaux se présentant sous forme de bande continue, notamment du papier. Ce cylindre comporte un corps cylindrique avec au moins un rebord (12). Il est prévu au moins une conduite d'alimentation et de retour (24) pour un milieu de chauffage, notamment de la vapeur d'eau. Plusieurs conduites ou alésages (16), au moins approximativement parallèles et se trouvant de préférence à la périphérie, permettent d'acheminer le milieu de chauffage à travers le corps du cylindre. Selon l'invention, il est prévu à l'intérieur du cylindre chauffant au moins un réservoir (28) pour le condensat qui résulte de la condensation du milieu de chauffage, de préférence de la vapeur d'eau.
EP94914416A 1993-04-23 1994-04-25 Cylindre chauffant Expired - Lifetime EP0647286B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4313379 1993-04-23
DE4313379A DE4313379C2 (de) 1993-04-23 1993-04-23 Heizwalze
PCT/EP1994/001285 WO1994025670A1 (fr) 1993-04-23 1994-04-25 Cylindre chauffant

Publications (2)

Publication Number Publication Date
EP0647286A1 true EP0647286A1 (fr) 1995-04-12
EP0647286B1 EP0647286B1 (fr) 1998-12-02

Family

ID=6486237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94914416A Expired - Lifetime EP0647286B1 (fr) 1993-04-23 1994-04-25 Cylindre chauffant

Country Status (7)

Country Link
US (1) US5662572A (fr)
EP (1) EP0647286B1 (fr)
JP (2) JPH08500862A (fr)
CA (1) CA2139114A1 (fr)
DE (1) DE4313379C2 (fr)
FI (1) FI946067A (fr)
WO (1) WO1994025670A1 (fr)

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DE19511086A1 (de) * 1995-03-25 1996-09-26 Schwaebische Huettenwerke Gmbh Dampfbeheizte Walze mit Kühlung
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GB2326890B (en) * 1996-04-09 2000-03-29 Schwaebische Huettenwerke Gmbh Steam-heated roller with cooling system
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US6315703B1 (en) * 1999-05-07 2001-11-13 Kleinewefers Textilmaschinen Gmbh Pressure treatment roller
DE10235142A1 (de) * 2002-08-01 2004-02-19 Shw Casting Technologies Gmbh Vorrichtung und Verfahren zur Oberflächenbearbeitung von Papierbahnen und ähnlichen Endlosvliesen mittels beheizbarer Walze
DE10351515A1 (de) * 2003-11-05 2005-06-09 Voith Paper Patent Gmbh Walze zur thermischen Behandlung einer Materialbahn
KR101455109B1 (ko) * 2013-06-27 2014-10-29 현대제철 주식회사 벨트 컨베이어용 해동장치
CN106945347B (zh) * 2017-04-19 2023-08-18 云南全心包装印刷有限公司 一种稳定节能的蒸汽压辊及应用其的蒸汽节能循环系统
DE102019120827A1 (de) * 2018-08-10 2020-02-13 Oerlikon Textile Gmbh & Co. Kg Galette
CN113465342B (zh) * 2021-07-15 2022-11-18 荆州市中宇防水材料有限公司 一种用于生产防水卷材的胎体烘干机

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Also Published As

Publication number Publication date
EP0647286B1 (fr) 1998-12-02
FI946067A0 (fi) 1994-12-23
WO1994025670A1 (fr) 1994-11-10
JPH08500862A (ja) 1996-01-30
DE4313379C2 (de) 1998-11-05
DE4313379A1 (de) 1994-10-27
FI946067A (fi) 1995-02-20
JP3706595B2 (ja) 2005-10-12
JP2002339284A (ja) 2002-11-27
US5662572A (en) 1997-09-02
CA2139114A1 (fr) 1994-11-10

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