EP1121483B1 - Method and apparatus for pretreating paper pulp - Google Patents

Method and apparatus for pretreating paper pulp Download PDF

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Publication number
EP1121483B1
EP1121483B1 EP99939465A EP99939465A EP1121483B1 EP 1121483 B1 EP1121483 B1 EP 1121483B1 EP 99939465 A EP99939465 A EP 99939465A EP 99939465 A EP99939465 A EP 99939465A EP 1121483 B1 EP1121483 B1 EP 1121483B1
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EP
European Patent Office
Prior art keywords
gas separation
separation tank
paper pulp
pulp
screening
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.)
Expired - Lifetime
Application number
EP99939465A
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German (de)
English (en)
French (fr)
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EP1121483A1 (en
Inventor
Jouni Matula
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.)
Andritz Oy
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Andritz Oy
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Publication date
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Publication of EP1121483A1 publication Critical patent/EP1121483A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the present invention relates to a method of and apparatus for pretreating paper pulp.
  • the method and apparatus according to the invention are especially preferably applicable to be used in paper machine approach systems in order to optimize the operation of the so-called short circulation.
  • the fiber suspension is pumped from the white water tank usually at the machine level of the mill, i.e. the location level of the paper machine, or, as in said patent, to a first cleaning stage of a centrifugal cleaning plant located above it.
  • the centrifugal cleaning plant usually comprises several (most commonly 4 - 6) stages, each typically having a feed pump of its own.
  • a gas-separation tank typically located at a level above the machine level. In practice that means about 10 - 12 meters above the surface of the white water tank.
  • the fiber suspension In the gas-separation tank the fiber suspension is subjected to the effect of vacuum created by vacuum apparatus, which most commonly are liquid ring pumps, whereby both part of the gas dissolved in the suspension and the gas in the form of small bubbles in the suspension rises above the surface of the liquid in the tank and is discharged from the tank through the vacuum apparatus.
  • vacuum apparatus which most commonly are liquid ring pumps
  • both part of the gas dissolved in the suspension and the gas in the form of small bubbles in the suspension rises above the surface of the liquid in the tank and is discharged from the tank through the vacuum apparatus.
  • the fiber suspension wherefrom gas has been removed as thoroughly as possible, flows to a fan pump located at the bottom level of the mill, which feed pump further pumps the fiber suspension to a head box screen (not shown in said US-patent) also located at the bottom level of the mill, whereafter the fiber suspension flows to the machine level into the head box of the paper machine.
  • centrifugal cleaning plant creates other problems, too.
  • the traditional location of the centrifugal cleaning plant in the paper machine approach system has been explained on the grounds that the location is chosen to ensure that the fiber suspension just prior to the head box of the paper machine is free of particles unsuitable for paper making, such as sand, bark specks, slivers and even over-sized filler pieces, which may all be called as, e.g., impurities or impurity particles.
  • centrifugal cleaning plant a major part of the fraction rejected by said centrifugal cleaning plant, that is fraction removed from the flow going to the paper machine head box, is as such suitable for papermaking.
  • the cyclones of the centrifugal cleaning plant are dimensioned to prevent any unsuitable material from passing into the head box, and, on the other hand, the centrifugal cleaners may be planned to operate in an optimal way with one material only or a few very similar materials. Taking into account e.g. the very different densities of various components, such as e.g.
  • centrifugal cleaning plant can not perform optimal function with regard to any component, but the basic goal of the centrifugal cleaning plant has to be to keep the ratios of the components in the fiber suspension essentially unchanged during the cleaning and to prevent any particle unsuitable for papermaking from entering the head box of the paper machine.
  • the same problem is dealt with in FI patents 93753 and 97736, although accepting the presence of reject from the centrifugal cleaning plant.
  • centrifugal cleaning plant Due to great liquid volume and complex flow piping, the centrifugal cleaning plant tends to, if not directly create fluctuation in paper pulp flow and pulp pressure, at least maintain and possibly strengthen these fluctuations. Further, a complex centrifugal cleaning plant comprising several (most commonly 4 - 6) stages and a large amount of relatively small-sized flow units creates a major flow resistance, the compensation of which using several large-sized centrifugal pumps is very power-consuming. Usually there is a separate feed pump for each cleaning stage of the centrifugal cleaning plant, in which case the total power requirement of all the pumps of the short circulation of the paper machine in an average-sized mill is in the order of 2 MW.
  • the first disadvantage is noticed to be the location of the gas separation tank usually being placed at a level above the machine level. If it would be possible to bring the gas separation tank to the machine level, it would eliminate the need to pump the fiber suspension with the feed pump higher than the machine level.
  • a precondition for this is, though, that the gas separation tank has to be constructed either to function without overflow, because the functioning of overflow requires a relatively high free fall, in practice from above the machine level to the level under the machine level, or to comprise a pump arranged in connection with the overflow to create the pressure difference ensuring the functioning of the overflow.
  • the surface level of the gas separation tank (to be more exact, the inlet pressure of the fan pump) could not be determined by means of overflow, when applying the first alternative, but some substitutive method should be found.
  • the basic goal of the regulation of the surface level of the gas separation tank is, as already mentioned before, to maintain the inlet pressure of the fan pump constant, it is in fact more economical to use a regulation system taking into account, in addition to the changes in the surface level, also the fluctuations in paper pulp density, which may sometimes be remarkable. As a result, this kind of change will be accompanied by improvement in paper quality and stabilization of the manufacturing process.
  • the result is a solution that is more economical in view of energy consumption in pumping and, at the same time, has a distinctly positive effect on paper quality and process runnability.
  • a further factor having an effect on the energy consumption of pumping in the paper machine approach system is the height of the white water tank.
  • the white water tanks i.e. tanks wherein the so-called white waters from the paper machine are collected, have traditionally been almost ten meters high, relatively large containers located at the bottom level of the paper mill, and the surface level of these tanks has fluctuated a lot.
  • One reason for the differences in the surface level is e.g. the location of the white water tank in connection with the machine.
  • the white water tank in that case also referred to as the wire pit, has been located under the wire section, whereby even constructional reasons have caused the surface level of the white water tank to be relatively low.
  • the surface level of a white water tank arranged at the side of the wire section or the like (a so-called off-machine silo), in turn, is not always as high as it might in practice be.
  • the big size of the white water tank has been justified on the basis that the presence of a big buffer tank has been regarded as a positive factor stabilizing the process. This has also caused some increase in energy consumption, because at first the feed pump has had to compensate the sometimes low surface level of the white water tank, and extra delays in the process due to the big volume of the white water tank.
  • Said location of the white water tank at the bottom level of the mill, that is, under the machine level, may be avoided in the approach system according to the invention.
  • the solutions according to the invention make it possible to arrange the white water tank at the machine level, whereby also the gas separation tank feed pump located at the side of the white water tank is placed at the machine level.
  • the prior art approach system illustrated in Fig. 1 comprises a white water tank 10, a feed pump 12, a centrifugal cleaning plant 14 (with several stages not shown), a gas separation tank 16 with its vacuum apparatus 17, a fan pump 18, a head box screen 20, a head box 22 of the paper machine and white water collection channels (not shown).
  • Said components are placed in connection with the paper machine 24 and arranged to operate as follows.
  • Fiber material used in paper making which may comprise fresh pulp, secondary pulp and/or broke, and fillers which are diluted with the so-called white water obtained from the paper machine, primarily from its wire section, are introduced into the white water tank 10 into which the white waters are collected and which is usually located at the bottom level of the mill in prior art arrangements, to produce paper pulp.
  • a feed pump 12 located at the bottom level of the mill, said paper pulp is pumped from the white water tank 10 to the centrifugal cleaning plant 14 usually located at the machine level K of the mill (the location level of the paper machine 24), which cleaning plant most usually comprises 4 - 6 stages.
  • Stock accepted by the first stage of the centrifugal cleaning plant 14 proceeds further under pressure created by the feed pump 12 (and with the contributory effect of the vacuum of the gas separation tank) into the gas separation tank 16 located at a level T above the machine level.
  • the gas separation tank 16 typically comprises an overflow to keep the surface level of stock in the tank constant. At the overflow the stock discharged from the tank flows down under the machine level into the white water tank 10 located at the bottom level of the mill.
  • the essentially gas-free paper pulp i.e. pulp from which gas has been removed as thoroughly as possible by means of the vacuum apparatus 17 flows into the fan pump 18 located at the bottom level of the mill, which fan pump pumps the paper pulp further to the head box screen 20 also located at the bottom level of the mill, wherefrom the accepted paper pulp flows to the machine level K into the head box 22 of the paper machine 24.
  • FIG. 2 illustrates a solution according to a preferred embodiment of the invention in connection with a conventional white water tank 10 of prior art.
  • three pipelines 40, 42 and 44 are connected with the white water tank 10, each pipeline bringing different fiber pulp into the white water tank.
  • Each pipeline 40 - 44 is connected to its own centrifugal cleaning arrangement 46, 48 and 50 respectively.
  • centrifugal cleaning is by no means the only screening possibility, as pressure screens of new type, preferably provided with slot drums, are very well suitable for the final screening of various pulp fractions.
  • each centrifugal cleaning arrangement 46 - 50 is considered to treat its own sort of pulp e.g. so that arrangement 46 treats the pulp broke from the broke pulper of the paper machine, arrangement 48 recycled fiber pulp and arrangement 50 fresh fiber pulp.
  • the figure further illustrates a pump in connection with each centrifugal cleaning arrangement, with which pumps the different pulps are introduced through the cleaner/s into the white water tank 10. Said pumps may, though, be located in the process remarkably further from the cleaner/s.
  • each sort of pulp may be treated as optimally as possible, in other words so that each cleaner may be chosen and run according to optimal screening of the sort of pulp in question.
  • the process may comprise various intermediate tanks, pumpings or other apparatus needed for treatment of each pulp fraction.
  • the embodiment of the figure illustrates a filler treatment arrangement comprising a mixing/dispersing tank 56, a filler slurry feed pump 58 and a centrifugal cleaning arrangement 54 performing the screening of the filler and a pipeline 52 feeding the screened filler material to between the white water tank 10 and the feed pump 120.
  • This arrangement ensures that only really too big-sized filler particles are removed from the filler material flow and either totally removed from the system or e.g. returned back to the dispersing stage.
  • this solution prevents the rejecting of fairly big filler particles which are still clearly thinner than the paper, which rejecting would be normal in case of a conventional prior art centrifugal cleaning plant.
  • feed pump 120 a propeller pump is employed which creates a head that is sufficient at least when e.g. there is no centrifugal cleaning plant creating flow resistance between the pump 120 and the gas separation tank 16.
  • the feed pump may be replaced with the vacuum apparatus of the gas separation tank, which vacuum apparatus creates the pressure difference needed for transferring the paper pulp.
  • Figure 3 illustrates a solution according to a second preferred embodiment of the invention. It relates to a new kind of white water tank 100 located essentially (the main part of the white water tank is above the surface of the machine level and the water level is clearly above the surface of the machine level) at the machine level of the paper mill, into which tank the fiber fractions are brought via pipelines 40 - 44 and which has a surface level at the level S 100 .
  • the figure illustrates in broken lines a prior art white water tank 10 located at the bottom level of the mill and having a surface level at level S 10 , and a feed pump 12.
  • the height difference between the surface levels of S 100 and S 10 is several meters, especially in cases where the wire pit is located under the wire section of the paper machine, whereby the difference in height may be calculated directly in extra consumption of pumping energy in an arrangement according to prior art.
  • a large-sized white water tank creates in the operation of the process a delay of its own.
  • the height difference dh between the surface levels of the white water tank 100 and the gas separation tank 16 is less than 9 meters, preferably less than 6 meters, suitably 2 - 4 meters, whereby the head requirement of the pump 120 is low enough to fully enable the use of a propeller pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP99939465A 1998-08-21 1999-08-18 Method and apparatus for pretreating paper pulp Expired - Lifetime EP1121483B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI981798A FI105489B (fi) 1998-08-21 1998-08-21 Menetelmä ja laitteisto paperimassan esikäsittelemiseksi
FI981798 1998-08-21
PCT/FI1999/000684 WO2000011265A1 (en) 1998-08-21 1999-08-18 Method and apparatus for pretreating paper pulp

Publications (2)

Publication Number Publication Date
EP1121483A1 EP1121483A1 (en) 2001-08-08
EP1121483B1 true EP1121483B1 (en) 2004-02-25

Family

ID=8552339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99939465A Expired - Lifetime EP1121483B1 (en) 1998-08-21 1999-08-18 Method and apparatus for pretreating paper pulp

Country Status (12)

Country Link
EP (1) EP1121483B1 (fi)
JP (1) JP2002523642A (fi)
KR (1) KR20010072847A (fi)
CN (1) CN1134567C (fi)
AT (1) ATE260357T1 (fi)
AU (1) AU5374999A (fi)
BR (1) BR9913176B1 (fi)
CA (1) CA2340438C (fi)
DE (1) DE69915089T2 (fi)
ES (1) ES2214877T3 (fi)
FI (1) FI105489B (fi)
WO (1) WO2000011265A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI122916B (fi) * 2007-04-03 2012-08-31 Andritz Oy Laitteisto kaasun poistamiseksi paperikoneen tai vastaavan yhteydessä
DE102009006715A1 (de) * 2009-01-29 2010-08-05 Voith Patent Gmbh Ausschussaufbereitung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219340A (en) * 1978-12-14 1980-08-26 Clark & Vicario Corporation Method and apparatus for outflowing liquids from chamber maintained under vacuum
FI89728C (fi) * 1992-05-19 1993-11-10 Pom Dev Oy Ab Foerfarande och anlaeggning foer cirkulation av processvattnet i en pappersmaskin
FI97332B (fi) * 1993-12-23 1996-08-30 Pom Technology Oy Ab Laite ja menetelmä kaasun ja nesteen muodostaman seoksen pumppaamiseksi ja erottamiseksi

Also Published As

Publication number Publication date
EP1121483A1 (en) 2001-08-08
DE69915089D1 (de) 2004-04-01
FI981798A0 (fi) 1998-08-21
ES2214877T3 (es) 2004-09-16
CA2340438A1 (en) 2000-03-02
CN1313917A (zh) 2001-09-19
CN1134567C (zh) 2004-01-14
FI981798A (fi) 2000-02-22
KR20010072847A (ko) 2001-07-31
JP2002523642A (ja) 2002-07-30
CA2340438C (en) 2008-01-15
FI105489B (fi) 2000-08-31
AU5374999A (en) 2000-03-14
ATE260357T1 (de) 2004-03-15
WO2000011265A1 (en) 2000-03-02
DE69915089T2 (de) 2004-09-09
BR9913176A (pt) 2001-05-15
BR9913176B1 (pt) 2009-05-05

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