WO2009120141A1 - Cuve de lessiveur pour lessiveur en continu - Google Patents

Cuve de lessiveur pour lessiveur en continu Download PDF

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Publication number
WO2009120141A1
WO2009120141A1 PCT/SE2009/050313 SE2009050313W WO2009120141A1 WO 2009120141 A1 WO2009120141 A1 WO 2009120141A1 SE 2009050313 W SE2009050313 W SE 2009050313W WO 2009120141 A1 WO2009120141 A1 WO 2009120141A1
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WO
WIPO (PCT)
Prior art keywords
digester
digester vessel
vessel
parts
zone
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/SE2009/050313
Other languages
English (en)
Inventor
Johan Hagberg
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.)
Metso Fiber Karlstad AB
Original Assignee
Metso Fiber Karlstad AB
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 Metso Fiber Karlstad AB filed Critical Metso Fiber Karlstad AB
Publication of WO2009120141A1 publication Critical patent/WO2009120141A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J12/00—Pressure vessels in general
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/24—Continuous processes
    • 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
    • D21C7/00—Digesters

Definitions

  • the present invention concerns a digester vessel for a continuous digester used during the manufacture of cellulose pulp according to the introduction to claim 1.
  • the vessel be classified as a single pressure vessel, and the dimensioning is carried out against the background of the highest permitted pressure and the highest permitted temperature in the digester.
  • the total cost for a typical digester vessel in a digester that can produce 3,000 tonnes of pulp per day is just over SEK 15 million, assuming that the material 2205 is used, with a consumption of material of just over 40 m 3 of steel, a cost of SEK 50 per kg, and that the vessel is classified as one single vessel.
  • This classification of the digester vessel as one single pressure vessel does not, however, take into consideration the fact that the continuous digester will enclose, once operation has been established, several different treatment zones, each one of which has a different temperature. This means that certain parts of the digester vessel will be overdimensioned. Other temperatures may be established in these zones during start-up and close-down of the continuous digester, if the process is not monitored and adjusted, and this has not been considered with respect to the strength of the digester vessel.
  • the pressure that is established during start-up can, for example, be reduced, and this affects directly the load on the material.
  • these operating conditions are of such short duration relative to the established operating condition of the continuous digester, that they may be permitted as short-duration conditions, and not as design conditions, from the point of view of classification.
  • a first purpose of the invention is to reduce the cost of the digester vessel, where savings as large as up to 10% of the total cost may be obtained.
  • a second purpose is to reduce the consumption of material, which is positive from the point of view of efficient use of a limited resource, reducing the lifecycle cost of the digester vessel, and reducing the load on the environment.
  • Figure 1 shows in principle a digester vessel for a continuous digester
  • FIG. 2 shows in detail how two zones are united
  • Figure 3 shows another alternative how two zones are united.
  • a typical digester is shown in Figure 1 where it is assumed for purposes of comparison that it is a conventional digester with a capacity of 3,000 tonnes of pulp per day.
  • the digester vessel has an excess pressure of at least 2 bar, the temperatures in the treatment zones of the digester exceed 8O 0 C, and the temperatures differ by more than 1O 0 C between at least two treatment zones.
  • Zone Z1 in this assumed digester is a wash and cooling zone before output from the digester, where the cooked pulp is washed and cooled with washing filtrate W L IQ, which is added through the nozzles N 1 , N 2 at the bottom of the digester, and by liquid that is introduced through the central pipe C 1 in the digester circulation CC 1 from the strainer SC 1
  • the temperature of the liquid in the circulation CC 1 may be modified, as is indicated, by withdrawing a flow F O u ⁇ in the form of at least one of heat and liquid, and by supplying a flow F, N in the form of at least one of cooling and liquid.
  • Zone Z2 in this assumed digester is the cooking zone itself, where an even cooking temperature is established.
  • the temperature of the chips may be adjusted before cooking by the addition of cooking fluid that is introduced through the central pipe C 2 in the cooking circulation CC 2 from the strainer SC 2 .
  • the temperature of the liquid in the circulation CC 2 may be modified, as is indicated, by withdrawing a flow F O ⁇ m the form of at least one of heat and liquid, and by supplying a flow F IN in the form of at least one of cooling and cooking fluid.
  • a temperature of 150 0 C is established in Zone Z2 in this case.
  • Zone Z3 in this assumed digester is a heating zone in which the chips CH !N that are fed into the digester are heated by the addition of saturated or overheated steam ST.
  • the temperature of the chips can be adjusted also before the input using various treatments located prior to the digester.
  • a temperature of 200°C is established in Zone Z3 in this case.
  • the thickness of metal is proportional to the yield strength according to: 2 which would give the following relationship:
  • the thickness of metal is reduced to: 315 tm ⁇ n,ny ⁇ ⁇ min.nu var ande 360
  • Zone 1 approximately 13.5 m with a diameter of 10.8 m and with a metal thickness of 32 mm
  • Zone 2 approximately 15.5 m with a diameter of 10.5 m and a thickness of metal of 27 mm, with a vertical conical part with height 13 m and a mean diameter of 7.7 m and an approximate (mean) metal thickness of 20 mm
  • Zone 3 approximately 13.3 m with a diameter of 5.2 m. This zone, however, will not be the subject for a savings in cost according to this calculation model.
  • 10 8 ⁇ 0 032 0 875 13 5 12 825m
  • 094 0 94 18 888m 3
  • Zone Y. 14 657 -12 825 1 832 m
  • the cost of steel of quality 1.4462 (2205) is approximately SEK 50 per kg and its density is 7850 kg/m 3 , which gives a savings in cost of 3.038x7850x50 ⁇ SEK 1 ,192,000
  • a digester vessel can be optimised in the same way, if Z3 is a low- temperature impregnation zone in a single-vessel cooking plant as defined by the concept of "Japanese Cooking” developed by Metso Fiber Karlstad, where as low a temperature as possible is striven after for the impregnation, such that the chips are well- impregnated and the level of rejection in the cooked pulp is reduced to a minimum.
  • Japanese Cooking was applied for in respect of the "Japanese Cooking” technique by Kamyr AB together with the Japanese company Jujo as long ago as 1971 (JP, A, 65874171; JP, B, 108820).
  • a further variant is that the two zones Z1 and Z2 or Z2/Z3 used as examples here may have an essentially similar temperature level, which differs from that of the third zone. It is obvious that the savings are proportional to the degree of difference in the design temperatures of the various parts.
  • Figure 2 shows how an upper digester vessel wall 30 in one zone Z3 can be united with an underlying digester vessel wall 20 through a conventional welded joint 1. It is appropriate that the transition is located at an increase in diameter of the pressure vessel in association with the digester flow, where a strainer section SC 2 is located between the parts for withdrawal of cooking fluid.
  • FIG. 3 shows a further variant in which an upper digester vessel wall 30 in one zone Z3 can be united with an underlying digester vessel wall 20 through a conventional flange joint, where the walls are provided with flanges 3 that are held together with a bolted joint 2.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Commercial Cooking Devices (AREA)

Abstract

La présente invention concerne une cuve de lessiveur pressurisée destinée à un lessiveur en continu. Les dimensions des différentes parties Z1, Z2 et Z3 sont calculées en fonction des charges thermiques locales affectant les différentes zones. Cette conception permet de réaliser des économies atteignant 10% pour un lessiveur en continu.
PCT/SE2009/050313 2008-03-28 2009-03-25 Cuve de lessiveur pour lessiveur en continu Ceased WO2009120141A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800691A SE532085C2 (sv) 2008-03-28 2008-03-28 Kokarkärl för en kontinuerlig kokare
SE0800691-8 2008-03-28

Publications (1)

Publication Number Publication Date
WO2009120141A1 true WO2009120141A1 (fr) 2009-10-01

Family

ID=41114187

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2009/050313 Ceased WO2009120141A1 (fr) 2008-03-28 2009-03-25 Cuve de lessiveur pour lessiveur en continu

Country Status (2)

Country Link
SE (1) SE532085C2 (fr)
WO (1) WO2009120141A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2447216C1 (ru) * 2011-01-17 2012-04-10 Тарантин Сергей Анатольевич Способ делигнификации древесной щепы при производстве целлюлозы

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5985096A (en) * 1997-09-23 1999-11-16 Ahlstrom Machinery Inc. Vertical pulping digester having substantially constant diameter
US6193848B1 (en) * 1998-12-09 2001-02-27 Chicago Bridge & Iron Company Pressure-tight vessel for cyclic thermal handling
US20050045298A1 (en) * 2003-08-29 2005-03-03 Jack T. Baker Chip bin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5985096A (en) * 1997-09-23 1999-11-16 Ahlstrom Machinery Inc. Vertical pulping digester having substantially constant diameter
US6193848B1 (en) * 1998-12-09 2001-02-27 Chicago Bridge & Iron Company Pressure-tight vessel for cyclic thermal handling
US20050045298A1 (en) * 2003-08-29 2005-03-03 Jack T. Baker Chip bin

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GERLACH, H.D.: "Optimized Pressure Vessel Design with Special Respect to Operating Conditions", INT. J. PRES. VES. & PIPING, vol. 31, 1988, pages 285 - 293 *
LOVEYS, P.C.: "Design and construction of a large continuous digester", AUSTRALIAN WELDING JOURNAL, September 1973 (1973-09-01), pages 73 - 80 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2447216C1 (ru) * 2011-01-17 2012-04-10 Тарантин Сергей Анатольевич Способ делигнификации древесной щепы при производстве целлюлозы

Also Published As

Publication number Publication date
SE532085C2 (sv) 2009-10-20
SE0800691L (sv) 2009-09-29

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