EP3212840B1 - Verfahren und anordnung zur auslassverdünnung - Google Patents

Verfahren und anordnung zur auslassverdünnung Download PDF

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Publication number
EP3212840B1
EP3212840B1 EP15856135.7A EP15856135A EP3212840B1 EP 3212840 B1 EP3212840 B1 EP 3212840B1 EP 15856135 A EP15856135 A EP 15856135A EP 3212840 B1 EP3212840 B1 EP 3212840B1
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EP
European Patent Office
Prior art keywords
pulp
discharge
digester
screening process
liquor
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EP15856135.7A
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English (en)
French (fr)
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EP3212840A4 (de
EP3212840A1 (de
Inventor
Andreas Engelfeldt
Petteri KUUSISTO
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
Valmet AB
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Valmet Oy
Valmet AB
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    • 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
    • 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
    • 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
    • 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
    • D21D5/02—Straining or screening the pulp

Definitions

  • the present invention relates to pulp manufacturing processes in general, and particularly to adaptations of discharge dilution to enable improvements in screening in such processes.
  • Pulp processing typically comprises introducing wood chips or other lignocellulosic material into a digester or cooker together with an impregnation liquid e.g. black liquor from a displacement tank and the chips or other lignocellulosic material is preheated and pre-impregnated.
  • Black liquor is the waste product from the so called Kraft process when pulpwood is digested into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers.
  • black liquor is an aqueous solution of lignin residues, hemicellulose, and the inorganic chemicals used in the process.
  • white liquor is a strongly alkaline solution typically of sodium hydroxide and sodium sulfide which is used to break the bonds between lignin and cellulose.
  • white liquor is the "pure" impregnation liquid whereas the black liquor is recycled impregnation liquid.
  • hot black and white liquor is introduced into the digester and displaces the initially introduced impregnation liquid back into the displacement tank. Due to the introduction of hot liquor the fiber is heated and cooked during a period of maintaining the temperature at a desired level. The cooking dissolves or softens the lignin in the material and the cooking time and temperature is dependent on the material to be cooked as well as desired fiber properties after cooking.
  • black liquor e.g.
  • the digester is discharged to an atmospheric storage tower e.g. discharge tank from which the cooked pulp is transported via piping to e.g. a screening process in order to deliver a finished pulp with predetermined properties e.g. predetermined fiber fractions i.e. concentration of fibers in the pulp.
  • predetermined properties e.g. predetermined fiber fractions i.e. concentration of fibers in the pulp.
  • wood pulp can be defined as wood chips mechanically ground and/or chemically digested at elevated temperatures to produce fibers for use in manufacturing paper or fiber-based wood composites [1].
  • pulp can be manufactured from other lignocellulosic materials, e.g. bagasse.
  • Lignocellulose or lignocellulosic material refers to plant dry matter (biomass), so called lignocellulosic biomass.
  • So called virgin biomass includes all naturally occurring terrestrial plants such as trees, bushes and grass.
  • So called waste biomass is produced as a low value byproduct of various industrial sectors such as agricultural (corn stover, sugarcane bagasse, straw etc.), forestry (saw mill and paper mill discards).
  • Energy crops are crops with high yield of lignocellulosic biomass produced to serve as a raw material for production of second generation biofuel examples include switch grass (Panicum virgatum) and Elephant grass.
  • Pulp consistency is defined as the mass concentration of fibers in water. Consistency is calculated as (dry weight of sample/wet weight of sample) x100%. Pulp consistency is roughly divided into three ranges:
  • the different ranges of consistency are found in different parts of the pulping and papermaking process, for example high consistency can be found in e.g. mechanical pulping, reject refining, bleaching, storage, medium consistency in e.g. cooking, bleaching, storage, re-pulping, low consistency in stock preparation, cleaning, screening, beating, and blending.
  • liquor from the displacement liquor tank is utilized in order to dilute the pulp in the discharge sequence.
  • the dilution is necessary in order to enable emptying or discharging the pulp from the digester and into the discharge tank.
  • some of the process steps are fed with a pulp at low consistency and using liquor for its function.
  • a reject washer is often such a process step/stage.
  • the accept from these process steps which is a low consistency pulp which resembles pure liquor more than a thicker pulp, is subsequently fed to a reject tank and then fed to the discharge tank.
  • the flow from the reject tank then lowers the consistency in the system significantly.
  • a so called delta thickener is added, which removes most of the liquor from the pulp fed to the discharge tank
  • the pulp fed to the discharge tank from batch cooking does not have high consistency enough to handle all the liquor from the reject tank as dilution in the discharge tank without lowering the screen feed consistency more than desired.
  • the consistency is increased with a thickening device e.g. delta thickener or the like in order to enable the screening being fed at a normal consistency.
  • the thickening agent or device varies. The thickening agent and/or machinery introduces both unwanted process steps and material into the process, thus increasing both time and costs for the pulping process.
  • the present invention relates to improved discharge method and arrangement in pulp processing.
  • the proposed technology discloses a method of providing a diluted discharge pulp, comprising the steps of providing pulp with a first consistency in a digester, which pulp comprises cooked lignocellulosic fibrous material, diluting the provided pulp by feeding a reject liquor from a screening process into the digester during a discharge sequence to provide a diluted pulp in the digester, where the reject liquor from the screening process is a pulp with a lower consistency than the pulp with a first consistency, and feeding the diluted pulp through a discharge pipe to a discharge tank to provide a diluted discharge pulp.
  • the pulp can be diluted without addition of any unwanted additives and reject liquor can be reused in the discharge process.
  • the present disclosure will be described in the context of a batch cooking process. However, it is easily adapted for a case of continuous cooking. Further, although the background and the description of the proposed technology primarily describes the so called Kraft process, it is equally applicable to sulfite processes or similar with appropriate adaptation of processing terminology.
  • the inventors have identified the benefits of reusing reject liquor or low consistency pulp, i.e. pulp with a low concentration of solid fibers, from the screening process for diluting the pulp during the discharge sequence.
  • reject liquor or low consistency pulp i.e. pulp with a low concentration of solid fibers
  • the same functionality can be met by using liquor from a screening reject tank.
  • the dilution is then reduced so that it is not necessary to add any thickening device to run screening in normal consistency.
  • reusing low consistency reject liquor from the screening process for dilution during the discharge sequence will reduce the need for additives or machinery that increase the consistency of the feed into the screening process.
  • the pulp can comprise processed wood fiber [1] or other processed lignocellulosic fiber.
  • the method includes the steps of providing S10 pulp with a first consistency in a digester, said pulp comprising digested or cooked wood chips or other lignocellulosic fibrous material at a certain concentration. Subsequently, diluting S20 the provided pulp by feeding a low consistency screening reject liquor, i.e.
  • the low consistency screening reject liquor is in fact a pulp with low consistency, i.e. lower consistency than the pulp with a first consistency.
  • the low consistency screening reject liquor has a lower concentration of fibers than the pulp with a first consistency.
  • the diluting step S20 comprises feeding a first fraction of the reject liquor from the screening process into the discharge pipe to further dilute the pulp.
  • the method includes the further steps of diluting S40 the discharge pulp in the discharge tank with a second fraction of the reject liquor from the screening process, before (which is common for all embodiments) feeding S50 the (diluted or undiluted) discharge pulp to the screening process for screening S60.
  • the method includes an intermediate step of feeding the reject liquor from the screening process to a buffer, and subsequently feeding the first and/or second fraction from the buffer to the digester and optionally also to the discharge pipe and/or to the discharge tank.
  • step S25 it is possible to control, in step S25, the dilution in order to achieve a diluted pulp with a predetermined consistency or concentration of fibers. This may be performed by determining the concentration of the pulp in the digester and diluting the pulp in order to achieve a wanted concentration. More commonly though is diluting the pulp just enough to enable discharging the pulp from the digester.
  • the discharge dilution arrangement 100 comprises a digester 1 configured for receiving at least a lignocellulosic fibrous material and a cooking liquor to cook into a pulp. Further, the discharge dilution arrangement 100 includes a discharge tank 2 configured for receiving said pulp from said digester 1 and for outputting said pulp to a screening process. The digester 1 and the discharge tank 2 are connectable via a discharge pipe 3, configured for feeding cooked pulp from the digester 1 to the discharge tank 2.
  • the discharge dilution arrangement 100 includes a digester dilution pipe 4 configured for feeding a reject liquor from the screening process into at least the digester tank 1 to dilute the pulp, where the reject liquor from the screening process is a pulp with a lower consistency than the pulp in the digester.
  • the screening reject liquor is fed into the digester 1 at the bottom of the tank.
  • the discharge dilution arrangement 100 includes a first discharge dilution pipe 4' configured for additionally feeding the reject liquor from the screening process into the discharge pipe 3 to further dilute the pulp in the discharge pipe 3.
  • the discharge dilution arrangement 100 further includes a second discharge dilution pipe 5 configured for additionally feeding the reject liquor from the screening process into the discharge tank 2 as well to further dilute the pulp.
  • the discharge dilution arrangement 100 further comprises a buffer tank 6 arranged to receive the reject liquor from the screening process and to provide a first fraction of the reject liquor from the screening process to the digester dilution pipe 4 and optionally also a second fraction of the reject liquor from the screening process via the second discharge dilution pipe 5 to the discharge tank 2, to provide a diluted discharge pulp.
  • the buffer tank 6 is further configured to provide a third fraction of the reject liquor from the screening process via the first discharge dilution pipe 4' to the discharge pipe 3.
  • a digester 1 is disclosed with a capacity for processing 20 t/h of wood chips or other lignocellulosic material. Impregnation and/or cooking liquid, e.g. black and/or white liquor or similar depending on the chemical process used, is added to achieve a concentration of fibers in the pulp, or first consistency of the pulp, of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp. In order to enable emptying or discharging the digester 1, more liquor or similar is added to dilute the cooked pulp and to reduce the consistency of the cooked pulp to e.g. 5%.
  • Impregnation and/or cooking liquid e.g. black and/or white liquor or similar depending on the chemical process used, is added to achieve a concentration of fibers in the pulp, or first consistency of the pulp, of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp.
  • more liquor or similar is added to dilute the cooked pulp and to reduce the consistency of the cooked pulp to e
  • the discharge 2 is fed with screening reject liquor to further lower the concentration of fibers to about 3%.
  • the low consistency screening reject liquor is fed with a capacity of 2 t/h and a concentration of fibers, or consistency, of 0.6%, which corresponds to 330 m 3 /h.
  • the discharge tank 2 outputs 22 t/h with a consistency of 3% and a volume of 730 m 3 /h.
  • the dilution in both the digester 1 and optionally the discharge tank 2 is provided by adding the low consistency screening reject liquor, in contrast to the prior art.
  • a digester 1 is disclosed with a capacity for processing 20 t/h of wood chips or other lignocellulosic material.
  • Impregnation and/or cooking liquid e.g. black and/or white liquor or similar depending on the chemical process used, is added to achieve a concentration or first consistency of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp.
  • a low consistency screening reject liquor with a consistency of approximately 0.6% is added to dilute the cooked pulp in the digester.
  • the discharge 2 is also fed with the low consistency screening reject liquor.
  • the addition of screening reject liquor is performed with 0.8t/h with a consistency of 0.6% corresponding to 130 m 3 /h.
  • the discharge tank 2 outputs 22 t/h with a concentration of 4.1% and a volume of 530 m 3 /h.
  • the above described fiber concentrations are merely examples.
  • the above mentioned first consistency is typically around 10%, but can also vary within consistency intervals of for example around 9.5-10.5%, 9-11%, 8-12%.
  • the low consistency screening reject liquor is potentially 0.6%, but can also vary within concentration intervals of for example 0.3-1%.
  • the resulting diluted pulp is diluted to such an extent that it is possible to empty the digester with a minimum of dilution. As an example the diluted pulp could be between 4-7%, or 4-6%, 4-5%, 4.5-5.5%.
  • the specific concentrations can vary also outside the above given example intervals.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Claims (9)

  1. Verfahren zum Bereitstellen eines verdünnten Auslasszellstoffs, das Folgendes umfasst:
    Bereitstellen (S10) von Zellstoff mit einer ersten Konsistenz in einem Kocher, wobei der Zellstoff ein gekochtes lignozellulosisches Fasermaterial umfasst,
    gekennzeichnet durch
    Verdünnen (S20) des bereitgestellten Zellstoffs durch ein Zuführen einer Spucklauge aus einem Siebprozess in den Kocher während einer Auslasssequenz, um einen verdünnten Zellstoff in dem Kocher bereitzustellen, wobei es sich bei der Spucklauge aus dem Siebprozess um einen Zellstoff mit einer geringeren Konsistenz handelt als der Zellstoff mit der ersten Konsistenz, und
    Zuführen (S30) des verdünnten Zellstoffs durch ein Auslassrohr in einen Auslasstank, um einen verdünnten Auslasszellstoff bereitzustellen.
  2. Verfahren nach Anspruch 1, wobei der Schritt des Verdünnens (S20) zusätzlich ein Zuführen einer ersten Fraktion der Spucklauge aus dem Siebprozess in das Auslassrohr umfasst, um den verdünnten Zellstoff weiter zu verdünnen.
  3. Verfahren nach Anspruch 2, das die weiteren Schritte des Verdünnens (S40) des Auslasszellstoffs in dem Auslasstank mit einer zweiten Fraktion der Spucklauge aus dem Siebprozess und des Zuführens des verdünnten Auslasszellstoffs in den Siebprozess umfasst.
  4. Verfahren nach einem der Ansprüche 1-3, umfassend den Schritt des Zuführens der Spucklauge aus dem Siebprozess in einen Puffer, und anschließendes Zuführen der Spucklauge aus dem Puffer in mindestens den Kocher, und gegebenenfalls in das Auslassrohr und gegebenenfalls in den Auslasstank.
  5. Auslassverdünnungsanordnung (100), die Folgendes umfasst:
    einen Kocher (1), der zum Aufnehmen von mindestens einem lignozellulosischen Fasermaterial und einer Kochlauge zum Einkochen in einen Zellstoff konfiguriert ist;
    einen Auslasstank (2), der zum Aufnehmen des Zellstoffs aus dem Kocher (1) und zum Ausgeben des Zellstoffs in einen Siebprozess konfiguriert ist; und
    ein Auslassrohr (3), das zum Zuführen von gekochtem Zellstoff aus dem Kocher (1) in den Auslasstank (2) konfiguriert ist,
    gekennzeichnet durch
    ein Kocherverdünnungsrohr (4), das zum Zuführen einer Spucklauge aus dem Siebprozess in mindestens einen unteren Bereich des Kochertanks (1) konfiguriert ist, um den Zellstoff in dem Kocher (1) zu verdünnen, wobei es sich bei der Spucklauge aus dem Siebprozess um einen Zellstoff mit einer geringeren Konsistenz als der Zellstoff in dem Kocher handelt, und
    ein erstes Auslassverdünnungsrohr (4'), das zum zusätzlichen Zuführen der Spucklauge aus dem Siebprozess in das Auslassrohr (3) konfiguriert ist, um den Zellstoff in dem Auslassrohr (3) weiter zu verdünnen.
  6. Auslassverdünnungsanordnung nach Anspruch 5, umfassend ein zweites Auslassverdünnungsrohr (5), das zum zusätzlichen Zuführen der Spucklauge aus dem Siebprozess in den Auslasstank (2) konfiguriert ist, um den Zellstoff weiter zu verdünnen.
  7. Auslassverdünnungsanordnung nach Anspruch 5 oder 6, wobei die Anordnung ferner einen Puffertank (6) umfasst, der dazu ausgelegt ist, die Spucklauge aus dem Siebprozess aufzunehmen und die Spucklauge aus dem Siebprozess dem Kocherverdünnungsrohr (4) bereitzustellen, und gegebenenfalls eine erste Fraktion der Spucklauge aus dem Siebprozess dem ersten Auslassverdünnungsrohr (4'), um einen verdünnten Auslasszellstoff mit einer vorbestimmten Konsistenz bereitzustellen.
  8. Auslassverdünnungsanordnung nach einem der Ansprüche 5-7, wobei der Puffertank (6) ferner dazu konfiguriert ist, eine zweite Fraktion der Spucklauge aus dem Siebprozess über das zweite Auslassverdünnungsrohr (5) an den Auslasstank (2) bereitzustellen.
  9. Auslassverdünnungsanordnung nach einem der Ansprüche 5-8, wobei der Kocher (1) ein satzweise arbeitender Kocher oder ein kontinuierlicher Kocher ist.
EP15856135.7A 2014-10-31 2015-10-28 Verfahren und anordnung zur auslassverdünnung Active EP3212840B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1451303A SE539501C2 (sv) 2014-10-31 2014-10-31 Method and arrangement for discharge dilution
PCT/SE2015/051141 WO2016068783A1 (en) 2014-10-31 2015-10-28 Method and arrangement for discharge dilution

Publications (3)

Publication Number Publication Date
EP3212840A1 EP3212840A1 (de) 2017-09-06
EP3212840A4 EP3212840A4 (de) 2018-04-11
EP3212840B1 true EP3212840B1 (de) 2020-02-05

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EP (1) EP3212840B1 (de)
CA (1) CA2966142A1 (de)
SE (1) SE539501C2 (de)
WO (1) WO2016068783A1 (de)

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US3259538A (en) * 1963-04-22 1966-07-05 Lummus Co Comprehensive pulping system for producing paper pulp
US3830688A (en) * 1970-10-23 1974-08-20 Skogsaegarnas Ind Ab Method of reducing the discharge of waste products from pulp mills
SE394466C (sv) * 1974-05-16 1986-06-23 Mannbro Systems Handelsbolag Sett vid kontinuerlig alkalisk delignifiering av lignocellulosamaterial i tva eller flera steg, varav det sista med syrgas
US5066362A (en) * 1987-12-01 1991-11-19 Kamyr, Inc. Extended delignification in pressure diffusers
FI93748B (fi) * 1992-06-09 1995-02-15 Ahlstroem Oy Tapa ja laitteisto kuitususpension käsittelemiseksi
US6302997B1 (en) * 1999-08-30 2001-10-16 North Carolina State University Process for producing a pulp suitable for papermaking from nonwood fibrous materials
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester
SE0004050L (sv) * 2000-11-03 2001-11-05 Kvaerner Pulping Tech Kontinuerlig kokning av massa med nettomedströmsflöde i kokarens bottenparti
FI120505B (fi) * 2002-07-12 2009-11-13 Stora Enso Oyj Jatkuvatoiminen menetelmä selluloosapohjaisen massan keittämiseksi sekä menetelmään soveltuva massankeitin
FI20022055A7 (fi) * 2002-11-19 2004-05-20 Advanced Fiber Tech Aft Trust Menetelmä ja laite kuitususpension käsittelemiseksi
FI123023B (fi) * 2009-09-01 2012-10-15 Andritz Oy Menetelmä ja laitteisto suovan erottamiseksi
WO2011102760A1 (en) * 2010-02-17 2011-08-25 Metso Paper Sweden Ab Method and system for recycling of rejects in a process for cooking chemical pulp

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Also Published As

Publication number Publication date
SE539501C2 (sv) 2017-10-03
EP3212840A4 (de) 2018-04-11
WO2016068783A1 (en) 2016-05-06
EP3212840A1 (de) 2017-09-06
CA2966142A1 (en) 2016-05-06
SE1451303A1 (en) 2016-05-01

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EP3212840A1 (de) Verfahren und anordnung zur auslassverdünnung

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