WO2019177509A1 - Agencement pour retirer des liquides de traitement dans un système de récipient de traitement continu, et système de commande correspondant - Google Patents

Agencement pour retirer des liquides de traitement dans un système de récipient de traitement continu, et système de commande correspondant Download PDF

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Publication number
WO2019177509A1
WO2019177509A1 PCT/SE2019/050154 SE2019050154W WO2019177509A1 WO 2019177509 A1 WO2019177509 A1 WO 2019177509A1 SE 2019050154 W SE2019050154 W SE 2019050154W WO 2019177509 A1 WO2019177509 A1 WO 2019177509A1
Authority
WO
WIPO (PCT)
Prior art keywords
header
treatment
screens
withdrawal
arrangement
Prior art date
Application number
PCT/SE2019/050154
Other languages
English (en)
Inventor
Jonas SAETHERÅSEN
Roger JANSSON
Jerk SÖDERMAN
Original Assignee
Valmet 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 Valmet Ab filed Critical Valmet Ab
Priority to EP19768364.2A priority Critical patent/EP3765667A4/fr
Priority to BR112020018514-0A priority patent/BR112020018514B1/pt
Publication of WO2019177509A1 publication Critical patent/WO2019177509A1/fr

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Classifications

    • 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
    • D21C7/14—Means for circulating the lye
    • 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 relates generally to an arrangement for withdrawing treatment liquors from a treatment vessel in a continuous treatment vessel system and to a control system for controlling such an arrangement, wherein the arrangement comprises a plurality of screens in at least two screen rows, at least one withdrawal compartment and at least one header connected to the withdrawal compartment via a throttle hole.
  • the preferable field of application is the withdrawal or extraction of impregnation or cooking liquors when producing chemical paper pulp in a continuous digester or impregnation vessel.
  • cooking liquors need to be continuously supplied and withdrawn to optimize the treatment process.
  • the withdrawal is performed through a plurality of screens arranged in a chamber wall of the treatment vessel, and withdrawal compartments are arranged to receive the withdrawn liquor and transport it through throttle holes into headers for removal and subsequent treatment. Throttle holes allow the withdrawal to be performed symmetrically around the circumference of the treatment vessel, allowing for a uniform cooking or impregnation process inside the treatment chamber.
  • the object of the present invention is to eliminate or at least to minimize the problems mentioned above. This is achieved through an arrangement for withdrawing treatment liquors, a system comprising at least two such arrangements and a control system for controlling operation of such an arrangement according to the appended independent claims.
  • an arrangement for withdrawing treatment liquors from a treatment vessel in a continuous treatment vessel system comprising a chamber wall of a treatment chamber and the arrangement comprising a plurality of screens arranged in the chamber wall for withdrawing liquor from the treatment chamber, said screens being arranged in at least two screen rows, one above the other; at least one withdrawal compartment for each screen row for receiving liquor from the screens, and at least one header for receiving liquor from the withdrawal compartments via a throttle hole for each withdrawal compartment, wherein the header is connected to at least one withdrawal compartment on at least two screen rows.
  • the header is arranged at an angle to a vertical direction, said angle being smaller than 5°, preferably smaller than 2°, wherein the header more preferably is arranged essentially vertically or is arranged vertically.
  • the angle to the vertical direction is such that 0° ⁇ angle ⁇ 5°, and more preferably 0° ⁇ angle ⁇ 2°.
  • the header further comprises a hatch for cleaning, said hatch being arranged above the screen rows.
  • a cleaning fluid can be supplied through the hatch and the header thoroughly cleaned in an improved and more time efficient way.
  • the at least one withdrawal compartment is arranged to receive liquor from at least four screens.
  • the treatment vessel may comprise at least three screen rows and the header can be connected to at least one withdrawal compartment on each screen row. This also improves the withdrawing of liquors and allows the header to collect liquor from screens not immediately bordering on the header. In this way, subsections of the screen rows are created and serviced by one header each, so that one header collects treatment liquors from one sector of the circumference of the treatment vessel. By supplying at least two arrangements with headers in different sectors of the circumference of the treatment vessel, a system for withdrawing treatment liquors is created.
  • a control system for controlling operation of an arrangement for withdrawing treatment liquors from a treatment vessel in a continuous treatment vessel system, said treatment vessel comprising a chamber wall of a treatment chamber.
  • the control system comprises at least one sensor for detecting at least one operation parameter in a header, means for interrupting operation of the header, and a control unit configured to communicate with said at least one sensor and to receive a signal corresponding to said at least one operation parameter, and further also configured to control the means for interrupting operation of the header.
  • the operation parameter is preferably a pressure or a flow inside the header.
  • control unit is configured to compare said at least one operation parameter detected by the sensor with another detected operation parameter or with a reference parameter and to control the means for interrupting operation of the header in response to said comparison.
  • the operation parameter of one arrangement can be compared with another operation parameter detected in the same arrangement or with a reference parameter stored by the control system so that operation of the arrangement can be interrupted if the two detected parameters in the arrangement differ from each other or if the detected parameter is similar to or different from the reference parameter in a way that indicates that the operation of the arrangement needs to be improved.
  • the another detected operation parameter is detected by the same sensor, or wherein the another detected operation parameter is detected by a sensor arranged to detect an operation parameter in another header.
  • the operation parameters can be detected at different points in time to indicate a difference over time or the operation of two different headers can be compared.
  • control system further comprises input means and output means configured to transmit signals to and receive signals from the control unit, wherein the control system is preferably configured to communicate the detected at least one operation parameter to a user through the output means and wherein the control system is preferably configured to control the means for interrupting operation of the header in response to input given by a user.
  • a user of the system can receive information regarding the detected operation parameters and can also communicate with the control system in order to manually control the operation of the system, either in response to output given by the system itself or in response to other factors determined by the user.
  • Fig. 1 discloses a treatment vessel with a plurality of screen rows
  • Fig. 2 discloses a chamber wall with an arrangement for withdrawing treatment liquors according to the prior art
  • Fig. 3 discloses the chamber wall of Fig. 2 without some of the screens removed;
  • Fig. 4 discloses a chamber wall with an arrangement for withdrawing treatment liquors according to a preferred embodiment of the present invention
  • Fig. 5 discloses the chamber wall of Fig. 4 with outer covers for some of the headers removed to show an interior of the headers;
  • Fig. 6 discloses the chamber wall of Fig. 4 and Fig. 5 with outer covers for some of the headers and with some screens removed; and Fig. 7 discloses a schematic view of the control system according to a preferred embodiment of the invention.
  • Fig. 1 discloses a treatment vessel 1 that forms part of a continuous treatment vessel system, such as a digester or an impregnation vessel for use when treating wood chips in a pulping process.
  • a continuous treatment vessel system such as a digester or an impregnation vessel for use when treating wood chips in a pulping process.
  • wood chips are fed to the treatment vessel 1 through a top 4, cooked or impregnated inside the vessel 1 and removed through a bottom 5 after treatment and transferred to subsequent treatment in the pulping process.
  • Treatment liquor is supplied through the top 4 and/or bottom or through separate liquor inlets (not shown).
  • a first screen section 2 comprising a plurality of screen rows 2a, 2b, 3c, 2d, 2e is provided for withdrawal of treatment liquor at the middle of the cooking process and a second screen section 3 comprising a plurality of screen rows 3a, 3b, 3c, 3d, 3e, 3f is provided for withdrawal of treatment liquor at the end of the cooking process, according to a cooking profiling used.
  • only one screen section could be provided or alternatively more than two screen sections could be used.
  • the number of screen rows in each screen section can differ from only one and up to 10-15 or even more screen rows. The configuration shown in Fig. 1 with two screen sections and five or six screen rows in each section thus merely serves as an example.
  • Fig. 2-3 disclose an arrangement for withdrawing treatment liquor according to a prior art technology, where a plurality of screen rows 2a-d are each provided with a header 7 for collecting treatment liquor from a plurality of screens 6 in a chamber wall 11. Behind the screens 6 are withdrawal compartments 8 that are connected to the header 7 via throttle holes 9, so that liquor withdrawn from the treatment vessel 1 can flow through one of the screens 6, be collected in the withdrawal compartment 8 and reach the header 7 through the throttle hole 9.
  • the header 7 runs along a circumference of the treatment vessel 1 in an essentially horizontal orientation and collects treatment liquor from each withdrawal compartment 8 connected to one of the screen rows 2a-2d, before allowing the treatment liquor to flow from the header 7 through an outlet 10.
  • the throttle holes 9 serve an important function in creating a pressure drop to the header 7, so that the withdrawal of treatment liquor is evenly performed around the circumference of the treatment vessel 1 even though only one outlet 10 is typically provided. Without the throttle holes 9, the withdrawal would be more efficient near the outlet 10 and inefficient at other points of the circumference, but there is also a problem associated with the prior art of throttle holes being blocked by substance withdrawn from the cooking inside the treatment vessel 1 and thereby preventing withdrawal from those screens that are connected with blocked throttle holes 9.
  • Fig. 5-6 disclose an arrangement for withdrawing treatment liquor according to a preferred embodiment of the present invention, where components that are similar to the prior art solution of Fig. 2-3 are given the same reference numerals.
  • the present invention differs from the prior art solutions through the configuration of the header 7 that is connected to at least one withdrawal compartment 8 on at least two different screen rows 2a, 2b, 2c, 2d.
  • the header has a substantially vertical orientation and is able to transport treatment liquors more efficiently towards an outlet 10.
  • the throttle holes 9 are preferably provided in a wall 12 of the withdrawal compartments 8 that borders on the header 7 and differ from the prior art in that the throttle holes 9 can be provided along the wall 12 on a distance from a bottom 13 of the withdrawal compartment 8. This allows precipitations from the treatment chamber of the treatment vessel 1 to sink to the bottom 13 of the withdrawal compartment 8 and remain there while keeping the throttle hole 9 unblocked to allow treatment liquors to flow freely.
  • the header 7 is arranged essentially vertically along the chamber wall 11 of the treatment vessel 1, but in some embodiments the header 7 could also be arranged at an angle to a vertical direction, said angle preferably being smaller than 5°, more preferably smaller than 2°.
  • the advantage of keeping the angle small is that the header 7 can be connected to withdrawal compartments 8 of a plurality of the screen rows 2a-e, 3a-f and that the treatment liquors can flow down towards the outlet 10 in an efficient way while minimizing the risk of liquor remaining inside the header 7 and blocking or clogging the header 7 so that the transportation of treatment liquor is prevented.
  • the header 7 extends in the vertical direction along the chamber wall 11 between screens and is connected via throttle holes 9 to withdrawal compartments 8 on either side of the header 7 for each screen row 2a-e so that treatment liquor from at least one screen 6 on each screen row 2a-2e in a screen section 2, 3 can proceed through a withdrawal compartment 8 and a throttle hole 9 into the header 7 and proceed onwards to the outlet 10.
  • two screens 6 are connected to each withdrawal compartment 8 as shown in Fig. 4-6 but in other embodiments only one or more than two screens 6 could be connected to a withdrawal compartment 8. It is advantageous to connect as many as four screens 6 to one withdrawal compartment 8, in order to collect treatment liquor from a larger part of the circumference of the treatment vessel 1.
  • Each header 7 has a hatch 14 provided in an upper part of the header 7 to facilitate cleaning. It is advantageous to provide the hatch 14 above the screen rows 2a-e, 3a-f so that cleaning fluid can be inserted through the hatch 14 and be allowed to flow along the header 7 towards the outlet 10 in order to remove any remaining treatment liquor or precipitations from the treatment vessel.
  • the screens 6 may conventionally be cleaned through the supply of a cleaning fluid into the treatment chamber of the treatment vessel 1 after the cooking has been interrupted and any remaining contents of the treatment chamber removed; during such cleaning operations the cleaning fluid may flow through or around the screens and the adjoining withdrawal compartments and pass through the throttle holes 9 into the headers 7.
  • the cleaning of the screens can be performed without needing to remove the screens from the chamber wall 11, which is a significant advantage compared to prior art cleaning methods and save considerable time and cost.
  • self-cleaning screens 6 individual screens 6 can be cleaned without interrupting the cooking process simply through the interruption of operation of the header 7 connected to those screens 6, as will be described in more detail further below.
  • one header 7 could be arranged to receive treatment liquor from more than one screen section 2, 3.
  • an arrangement 100 for withdrawing treatment liquors from a treatment vessel 1 comprises a plurality of screens 6, withdrawal compartments 8 connected to the screens 6 and throttle holes 9 connecting each withdrawal compartment 8 to a header 7 that serves to receive treatment liquor and transport it to an outlet 10. If the header 7 is connected to each screen row 2a-e, 3a-f of a screen section 2, 3 that header receives all treatment liquor withdrawn from a given circle sector of the circumference of the treatment vessel 1.
  • more than one arrangement 100 is provided on the chamber wall 11 of the treatment vessel 1, they can cooperate to form a system that each withdraw liquor from a circle sector of the treatment vessel 1, and in a preferred embodiment arrangements 100 are provided around the entire circumference of a treatment vessel 1.
  • the operation of an arrangement 100 according to the present invention is controlled by a control system 1000 as disclosed schematically in Fig. 7.
  • the control system 1000 comprises a control unit 1010 that communicates with at least one sensor 15 in an arrangement 100 according to the present invention.
  • the sensor 15 is preferably configured to detect a pressure of a flow in the header 7 and may be located inside the header 7 or at the outlet 10, or at any other suitable location within the arrangement 100.
  • the sensor thus detects an operation parameter in the header, preferably a flow of treatment liquor or a pressure in the header 7, and transmits that operation parameter to the control unit 1010.
  • the control unit 1010 is also configured to control operation of a means 16 for interruption operation of the header 7, said means 16 preferably being a hatch or valve at the outlet 10 for stopping the flow through the header 7.
  • the detected operation parameter will be received by the control unit 1010 and a decision will be made by the control unit 1010 as to whether operation of the header 7 should be interrupted. If the flow is too low or the pressure too high, this would indicate that at least some of the throttle holes 9 are blocked and need to be cleaned, and such a cleaning operation could be performed by interrupting operation of the header to allow blockage to sink to the bottom of the withdrawal compartments 8 so that the flow of treatment liquor through the throttle holes 9 can once again be performed in the desired manner. After a predetermined time, operation of the header 7 would be resumed by a renewed activation of the means 16 for interrupting operation, for instance by opening the hatch or valve at the outlet 10 to allow the flow of treatment liquor once again.
  • the sensor 15 would once again detect the operation parameter and transmit the value to the control unit 1010 that would decide based on the value of the operation parameter whether the operation in the header 7 has been improved or if further cleaning operations would need to be performed.
  • the same cleaning operation could be repeated until the operation parameter has reached a predetermined value or interval that indicates that operation is sufficiently improved, or alternatively other cleaning measures such as reversing the flow of treatment liquor could be performed. If the operation is still not improved these and other cleaning procedures could be undertaken, or it could be decided by the control unit 1010 that one of the arrangements 100 should be shut down permanently by the means 16 for interrupting operation or that the entire cooking process should be interrupted for cleaning.
  • control unit 1010 is connected to input means 1020 and output means 1030 through which the system 1000 can communicate with a user.
  • the user could receive information regarding the operation of the system 1000 and the detected operation parameter for each arrangement 100 connected to the system 1000, and could also control the operation of the system 1000 by using the input means to manually instruct the system to interrupt operation of any given arrangement 100 or to give instructions for the operation of the system 1000 or input or adjust reference parameters in the system 1000.
  • the control system 1000 is connected to a plurality of arrangements 100 according to the present invention, but it would also be possible to be connected to one arrangement 100 only.
  • the control system 1000 would compare a detected operation parameter from a sensor 15 in one of the arrangements 100 with another detected operation parameter, either detected earlier by the same sensor 15 or detected simultaneously or earlier by a sensor 15 in another arrangement 100 connected to the control system 1000.
  • the detected operation parameter could be compared to a reference parameter stored in the control unit 1010 or given by a user as input through the input means 1020.
  • the control unit 1010 decides whether a cleaning operation should take place.
  • a number of operation criteria can be selected by a user and the control unit 1010 configured so that the means 16 for interrupting operation of the header 7 is activated if the detected operation parameter does not meet at least one of the operation criteria.
  • the control unit 1010 can also control the means 16 for interrupting operation of the header 7 in an arrangement 100 so that interruption takes place at predetermined times and can also control the arrangements 100 so that interruption of operation in one arrangement 100 does not coincide with interruption of operation in another arrangement 100 connected to the control system 1000.
  • the control unit 1010 can be any kind of data processing unit such as a computer, a processor or microprocessor or the like.
  • Output means can be a display unit, a computer screen or similar and the input means can be a touchscreen, keyboard or any other kind of user interface.

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  • Paper (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

La présente invention concerne un agencement pour retirer des liquides de traitement d'un récipient de traitement dans un système de récipient de traitement continu, ledit récipient de traitement comprenant une paroi de chambre d'une chambre de traitement, l'agencement comprenant une pluralité de cribles disposés dans la paroi de chambre pour extraire du liquide de la chambre de traitement, lesdits cribles étant agencés en au moins deux rangées de cribles, l'une au-dessus de l'autre ; au moins un compartiment de retrait pour chaque rangée de cribles pour recevoir du liquide depuis les cribles, et au moins un collecteur pour recevoir du liquide depuis des compartiments de retrait par l'intermédiaire d'un trou d'étranglement pour chaque compartiment de retrait, le collecteur étant relié à au moins un compartiment de retrait sur au moins deux rangées de cribles. L'invention se rapporte également à un système comprenant une pluralité d'agencements et à un système de commande pour commander le fonctionnement d'au moins un tel agencement.
PCT/SE2019/050154 2018-03-13 2019-02-20 Agencement pour retirer des liquides de traitement dans un système de récipient de traitement continu, et système de commande correspondant WO2019177509A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19768364.2A EP3765667A4 (fr) 2018-03-13 2019-02-20 Agencement pour retirer des liquides de traitement dans un système de récipient de traitement continu, et système de commande correspondant
BR112020018514-0A BR112020018514B1 (pt) 2018-03-13 2019-02-20 Arranjo e sistema para retirar licores de tratamento de um vaso de tratamento em um sistema de vaso de tratamento contínuo e sistema de controle para controlar operação de um arranjo para retirar licores de tratamento de um vaso de tratamento em um sistema de vaso de tratamento contínuo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1850279A SE541978C2 (en) 2018-03-13 2018-03-13 Arrangement for withdrawing treatment liquors in a continuous treatment vessel system, and a corresponding control system
SE1850279-9 2018-03-13

Publications (1)

Publication Number Publication Date
WO2019177509A1 true WO2019177509A1 (fr) 2019-09-19

Family

ID=67908397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2019/050154 WO2019177509A1 (fr) 2018-03-13 2019-02-20 Agencement pour retirer des liquides de traitement dans un système de récipient de traitement continu, et système de commande correspondant

Country Status (5)

Country Link
EP (1) EP3765667A4 (fr)
BR (1) BR112020018514B1 (fr)
CL (1) CL2020002289A1 (fr)
SE (1) SE541978C2 (fr)
WO (1) WO2019177509A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711367A (en) 1970-02-11 1973-01-16 Kamyr Ab Screening device in cellulose digesters
US4547264A (en) 1979-02-12 1985-10-15 Kamyr, Inc. Method of withdrawing liquid from a pair of vertically spaced annular screens
JPH07157991A (ja) * 1993-12-08 1995-06-20 New Oji Paper Co Ltd 連続蒸解における蒸解液抽出方法および装置
US6120647A (en) 1998-01-26 2000-09-19 Ahlstrom Machinery Inc. Simplified liquid removal system for a cellulose pulp digester
US20020069986A1 (en) * 2000-06-16 2002-06-13 Marcoccia Bruno S. System and method for improved filtrate addition in a continuous digester
WO2010044732A1 (fr) * 2008-10-13 2010-04-22 Metso Fiber Karlstad Ab Procédé destiné à empêcher un engorgement dans une structure d'épurateur pour un lessiveur en continu

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123808A (en) * 1997-12-09 2000-09-26 Ahlstrom Machinery Inc. Distribution of dilution liquor to the discharge of a cellulose pulp digester
WO2011096857A1 (fr) * 2010-02-02 2011-08-11 Metso Paper Sweden Ab Lessiveur continu à circulation de chauffage améliorée
SE539453C2 (en) * 2015-12-09 2017-09-26 Valmet Oy Screen arrangement for withdrawing treatment liquors in treatment vessels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711367A (en) 1970-02-11 1973-01-16 Kamyr Ab Screening device in cellulose digesters
US4547264A (en) 1979-02-12 1985-10-15 Kamyr, Inc. Method of withdrawing liquid from a pair of vertically spaced annular screens
JPH07157991A (ja) * 1993-12-08 1995-06-20 New Oji Paper Co Ltd 連続蒸解における蒸解液抽出方法および装置
US6120647A (en) 1998-01-26 2000-09-19 Ahlstrom Machinery Inc. Simplified liquid removal system for a cellulose pulp digester
US20020069986A1 (en) * 2000-06-16 2002-06-13 Marcoccia Bruno S. System and method for improved filtrate addition in a continuous digester
WO2010044732A1 (fr) * 2008-10-13 2010-04-22 Metso Fiber Karlstad Ab Procédé destiné à empêcher un engorgement dans une structure d'épurateur pour un lessiveur en continu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3765667A4

Also Published As

Publication number Publication date
BR112020018514A2 (pt) 2020-12-29
SE1850279A1 (en) 2019-09-14
CL2020002289A1 (es) 2021-02-05
SE541978C2 (en) 2020-01-14
EP3765667A4 (fr) 2021-12-15
EP3765667A1 (fr) 2021-01-20
BR112020018514B1 (pt) 2022-06-21

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