EP0122215A2 - Tambour de séchage rotatif - Google Patents

Tambour de séchage rotatif Download PDF

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Publication number
EP0122215A2
EP0122215A2 EP84630035A EP84630035A EP0122215A2 EP 0122215 A2 EP0122215 A2 EP 0122215A2 EP 84630035 A EP84630035 A EP 84630035A EP 84630035 A EP84630035 A EP 84630035A EP 0122215 A2 EP0122215 A2 EP 0122215A2
Authority
EP
European Patent Office
Prior art keywords
condensate
spoiler
bars
drum
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.)
Withdrawn
Application number
EP84630035A
Other languages
German (de)
English (en)
Other versions
EP0122215A3 (fr
Inventor
James Larry Chance
Gregory Lynn Wedel
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.)
Beloit Corp
Original Assignee
Beloit Corp
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 Beloit Corp filed Critical Beloit Corp
Publication of EP0122215A2 publication Critical patent/EP0122215A2/fr
Publication of EP0122215A3 publication Critical patent/EP0122215A3/fr
Withdrawn legal-status Critical Current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
    • D21F5/022—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
    • 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
    • D21F5/021—Construction of the cylinders

Definitions

  • This invention relates to the field of drying a moist traveling web which is carried on the surface of a rotary dryer drum that is heated by introducing a condensable vapor into its sealed interior. More particularly, this invention relates to a rotary, steam heated dryer drum equipped with spoiler bars mounted against its inner peripheral surface to interrupt the condensate layer formed as the steam condenses. Still more particularly, this invention concerns the relationship between the number and height of the spoiler bars in conjunction with the depth of the condensate layer, to enhance the condensate coefficient of heat transfer.
  • This invention represents an improvement over .the prior teachings about the enhancement of heat transfer through a steam heated rotating cylindrical dryer drum utilizing spoiler bars, and the relationship between the condensate depth, spoiler bar height and the spacing of the spoiler bars within the dryer roll. It was found that increasing the spoiler bar height and the spacing of the bars along the inner surface of the dryer drum in conjunction with a decreased condensate depth, produces greater turbulence in the condensate and thus an increased rate of heat transfer through the dryer wall than would have been expected from prior teachings.
  • Another object of the invention is to enhance the coefficient of heat transfer in a steam heated dryer drum utilizing spoiler bars mounted on the inner peripheral surface thereof.
  • Still another object of the invention is to provide a steam heated dryer drum designed to have enhanced heat transfer for a condensate depth of about 0,32 - 2,54 cm and equipped with about 8 - 20 spoiler bars.
  • the moist paper web is partially or completely dried by passing it onto the surface of one or more rotating dryer rolls having cylindrical, cast iron drum.
  • a condensable vapor such as steam, is introduced into the interior of the drum and condenses on its inner peripheral surface. As the steam condenses, it gives up heat which is passed through the drum wall to dry the paper held against its outer surface for a portion of its circumference. The higher the heat transfer coefficient through the drum wall, the more efficient this process is. This is important not only from an energy standpoint, but it is a factor in how fast the machines can run and still dry the web to the desired dryness. It also is a factor in the number of dryer rolls needed to produce dry paper at a desired speed.
  • the condensate layer formed on the inner peripheral surface of the drum effectively functions as an insulation layer impeding the transfer of heat from the steam to the inner surface of the dryer drum.
  • the condensate begins to rim around the inner peripheral surface of the dryer drum instead of collecting in a puddle at the bottom of the drum as it rotates about its horizontally disposed longitudinal axis.
  • Figure 1 illustrates an end view of a cross section of a dryer roll 8 having a drum 10 with an inner cylindrical surface 20 and an outer cylindrical surface 22 over which a moist web W is disposed to receive heat to drive out the moisture and dry the web.
  • the radial distance from the horizontally disposed, longitudinal axis of rotation 14 to the periphery of the internal surface 20 is R and a plurality of spoiler bars 12 are mounted to the internal surface 20 by suitable means, such as screws.
  • These spoiler bars extend axially within the dryer roll and are spaced apart circumferentially an equal distance S.
  • the spoiler bars have a height H which interacts with the condensate 16 as the' dryer rotates in the direction of arrow 18 to cause turbulence in the condensate as it is forced to travel up and over the top of the oncoming spoiler bars as they travel from the twelve o'clock position downwardly to the three o'clock and six o'clock positions where the condensate tends to accumulate.
  • the average condensate thickness h is shown at a point between two successive spoiler bars at about the eight o'clock position.
  • the shape of the condensate changes at different positions around the inner circumference of the dryer drum as it comes under the combined effects of the forces of rotation and gravity.
  • the condensate is more or less of a normal thickness 16 as it spills over the spoiler bars.
  • greater turbulence 16a is shown as the condensate spills over the bars.
  • the condensate 16b flattens out, and at about the nine o'clock position, the condensate again begins to build up as it sloshes against the oncoming spoiler bars.
  • the same four parameters namely bar height, bar spacing, condensate depth, and the inner radius, are also interrelated, but according to relationships which provide for fewer bars and higher heat transfer rates than taught by the prior art. Specifically, the relationships between these four parameters are given by the preceding equations (1), (2), and (3).
  • the spoiler bar height becomes an inverse function of the number of bars.
  • An important aspect of this relationship is that higher bars tend to produce increased turbulence in the condensate as it spills over the bars and sloshes against adjacent bars. This means that greater turbulence and correspondingly higher heat transfer rates can be produced with fewer bars.
  • the term 0.25 in the above equation is used to provide an acceptable range for the spoiler bar spacing considering the imprecise nature of the condensate sloshing over the spoiler bars during rotation of the dryer roll.
  • the width of the spoiler bars themselves is considered to be nigligible so the spacing S actually represents the distance between adjacent spoiler bars along the inner wall of the dryer roll.
  • Figure 3 - 5 show curves wherein the condensate heat transfer coefficient in kcal/hm 2 C is plotted as a function of the condensate thickness in cm in a standard 152 cm cast-iron dryer drum having an internal diameter of 146,7 cm.
  • Figure 3 represents data taken for a dryer drum equipped with 10 equally spaced spoiler bars mounted to the interior surface 20 of the dryer drum while Figures 4 and 5 represent data taken on the same dryer drum equipped with 15 and 30 spoiler bars, respectively.
  • the optimum spacing S between spoiler bars is
  • the preferred height range for the preferred range for the number of spoiler bars is known. Since the preferred number of spoiler bars is known, the preferred height range for the preferred range for the number of spoiler bars is known.
  • equation (5) is used to compute the values for spoiler bar spacing for various condensate thicknesses. This range is the shaded area shown. Again, the + 0.25 tolerance factor produces a vertical width for the range of desired spacing. The upper and lower spacing limits were determined from equation (3) using the range of the preferred number of bars.
  • this invention permits a high heat transfer coefficient even when the condensate thickness is relatively large (i.e. about 0,64 - 1,27 cm). Even more significantly, this is accomplished with relatively few (i.e. about 8 - 20) spoiler bars.
  • this invention resides in the combination of relatively few spoiler bars, each having a relatively large height used in conjunction with a relatively thick layer of condensate, but thinner than taught by the prior art.
  • This combination has the additional advantage of allowing a greater siphon clearance for condensate removal which lessens the likelihood of operational problems associated with relative movement between the siphon and the inner drum wall at high speeds, which can be greater than a mile a minute on modern papermaking machines.
  • Figures 3 - 5 show the condensate heat transfer coefficient h L for spoiler bars of various heights and different condensate thicknesses. Since the condensate thickness for the Appel et al dryer equipped with spoiler bars can be calculated from their equation (9) above and the same can be determined for this invention from equation (2) in the example above, the condensate thicknesses corresponding to a given number of spoiler bars can be compared. This has been done for 10, 15 and 30 spoiler bars in Table 1 below:
  • the heat transfer coefficient on a drum equipped with 15 spoiler bars according to this invention is about 2315 kcal/hm 2 °C at a condensate depth of about 0,58 cm for a spoiler bar height of 2,54 cm (shown as a dashed line).
  • the corresponding heat transfer coefficient for the same dryer roll at a condensate thickness of 1,30 cm for 0,95 cm high spoiler bars is about 1809 kcal/hm 2 °C.
  • the optimum condensate thickness according to this invention is about 0,15 cm at which the head transfer coefficient is about 2653 kcal/hm 2 °C.
  • the heat transfer coefficient is about 1737 kcal/hm 2 ° C .
  • an improved spoiler bar equipped dryer arrangement which achieves improved heat transfer through a new combination of spoiler bar spacing and height, and the depth of condensate.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
EP84630035A 1983-03-08 1984-03-07 Tambour de séchage rotatif Withdrawn EP0122215A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47330983A 1983-03-08 1983-03-08
US473309 1983-03-08

Publications (2)

Publication Number Publication Date
EP0122215A2 true EP0122215A2 (fr) 1984-10-17
EP0122215A3 EP0122215A3 (fr) 1985-05-22

Family

ID=23879037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84630035A Withdrawn EP0122215A3 (fr) 1983-03-08 1984-03-07 Tambour de séchage rotatif

Country Status (8)

Country Link
EP (1) EP0122215A3 (fr)
JP (1) JPS59176574A (fr)
KR (1) KR840007922A (fr)
BR (1) BR8401115A (fr)
ES (1) ES8503118A1 (fr)
FI (1) FI840928A (fr)
NO (1) NO840829L (fr)
ZA (1) ZA841573B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120060A1 (fr) * 2005-05-13 2006-11-16 Voith Patent Gmbh Cylindre chauffe
WO2006120121A2 (fr) * 2005-05-13 2006-11-16 Voith Patent Gmbh Cylindre de sechage
CN111226005A (zh) * 2017-10-10 2020-06-02 福伊特专利有限公司 造纸机的干燥缸

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006020835D1 (de) 2005-01-14 2011-05-05 Japan Tobacco Inc Aterial dafür
CN115682663B (zh) * 2022-09-29 2024-04-26 牡丹江师范学院 一种纳米材料生产干燥装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT229123B (de) * 1959-09-12 1963-08-26 Voith Gmbh J M Dampfbeheizter Trockenzylinder
US3217426A (en) * 1959-09-12 1965-11-16 Voith Gmbh J M Steam heated drying cylinder
US3724094A (en) * 1971-02-16 1973-04-03 Kimberly Clark Co Rotary drying drum
DE2825520A1 (de) * 1977-06-10 1978-12-21 Beloit Corp Trockentrommel zum trocknen einer feuchten bahn, insbesondere papierbahn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT229123B (de) * 1959-09-12 1963-08-26 Voith Gmbh J M Dampfbeheizter Trockenzylinder
US3217426A (en) * 1959-09-12 1965-11-16 Voith Gmbh J M Steam heated drying cylinder
US3724094A (en) * 1971-02-16 1973-04-03 Kimberly Clark Co Rotary drying drum
DE2825520A1 (de) * 1977-06-10 1978-12-21 Beloit Corp Trockentrommel zum trocknen einer feuchten bahn, insbesondere papierbahn

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120060A1 (fr) * 2005-05-13 2006-11-16 Voith Patent Gmbh Cylindre chauffe
WO2006120121A2 (fr) * 2005-05-13 2006-11-16 Voith Patent Gmbh Cylindre de sechage
WO2006120121A3 (fr) * 2005-05-13 2007-01-25 Voith Patent Gmbh Cylindre de sechage
CN111226005A (zh) * 2017-10-10 2020-06-02 福伊特专利有限公司 造纸机的干燥缸
CN111226005B (zh) * 2017-10-10 2022-02-18 福伊特专利有限公司 造纸机的干燥缸

Also Published As

Publication number Publication date
KR840007922A (ko) 1984-12-11
ES530341A0 (es) 1985-02-01
EP0122215A3 (fr) 1985-05-22
FI840928A0 (fi) 1984-03-07
ZA841573B (en) 1984-10-31
BR8401115A (pt) 1984-10-16
JPS6213592B2 (fr) 1987-03-27
FI840928A (fi) 1984-09-09
ES8503118A1 (es) 1985-02-01
NO840829L (no) 1984-09-10
JPS59176574A (ja) 1984-10-05

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Inventor name: WEDEL, GREGORY LYNN

Inventor name: CHANCE, JAMES LARRY