WO2010026295A1 - Method and equipment for controlling reject handling in pulping process - Google Patents
Method and equipment for controlling reject handling in pulping process Download PDFInfo
- Publication number
- WO2010026295A1 WO2010026295A1 PCT/FI2009/050706 FI2009050706W WO2010026295A1 WO 2010026295 A1 WO2010026295 A1 WO 2010026295A1 FI 2009050706 W FI2009050706 W FI 2009050706W WO 2010026295 A1 WO2010026295 A1 WO 2010026295A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ragger
- rope
- ragger rope
- pulper
- rate
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004537 pulping Methods 0.000 title claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000001965 increasing effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 16
- 238000005259 measurement Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Definitions
- the invention relates to a method for controlling reject handling in a pulping process which has a pulper for the preparation of a fibre pulp suspension and a ragger for the removal of reject from the pulper in the form of a ragger rope.
- the invention further relates to equipment for controlling reject handling in a pulping process which has a pulper for the preparation of a fibre pulp suspension and a ragger for the removal of reject from the pulper in the form of a ragger rope.
- the fibre material may for instance be cellulose or recycled fibre material or fibre-content material from a paper or board mill.
- Controlling the operation of a ragger is today based on controlling the ragger rope speed set by the user or operator.
- the speed of the ragger rope may be monitored through a camera used to monitor the operation of the ragger or through inspections at the ragger.
- These currently used control methods cannot in practice react to the continuously present variations in the raw material, which means that the removal of reject from the pulper is disturbed. Poor reject removal also causes malfunctions in the secondary pulper belonging to the pulping system and in the reject pump as well as a stronger than usual wear of the pulper rotor and screen plate.
- the method of the invention is characterised by measuring at least one property of the ragger rope and/or at least one effect caused by the ragger rope on the ragger and/or the rate of travel of the ragger rope and/or at least one property of the operation of the ragger, and by adjusting the rate of travel of the ragger rope and/or the rotation rate of the pulper rotor and/or the amount of raw material of the fibre pulp suspension being fed into the pulper on the basis of the measured ragger rope property and/or effect of the ragger rope on the ragger and/or the rate of travel of the ragger rope and/or the property of the operation of the ragger.
- the equipment of the invention is characterised in that the equipment comprises one or more measuring elements for measuring at least one property of the ragger rope and/or at least one effect caused by the ragger rope on the ragger and/or the rate of travel of the ragger rope and/or at least one property of the operation of the ragger and that the equipment comprises at least one control unit for adjusting the rate of travel of the ragger rope and/or the rotation rate of the pulper rotor and/or the amount of raw material of the fibre pulp suspension being fed into the pulper on the basis of the measured ragger rope property and/or effect of the ragger rope on the ragger and/or the rate of travel of the ragger rope and/or the property of the operation of the rag- ger.
- the method for controlling reject handling in a pulping process having a pulper for the preparation of a fibre pulp suspension and a ragger for the removal of reject from the pulper in the form of a ragger rope measures at least one property of the ragger rope and/or at least one effect of the ragger rope caused on the ragger and/or the rate of travel of the ragger rope and/or at least one property of the operation of the ragger, and adjusts the rate of travel of the ragger rope and/or the operation of the pulping on the basis of the measured ragger rope property and/or effect of the ragger rope caused on the ragger and/or rate or travel of the ragger rope and/or property of the operation of the ragger.
- the rate of travel of the ragger rope or the pulping operation may be controlled in a simple, controlled manner taking into consideration the impurities of the raw material. Due to the solution, breaking of the ragger rope may be reduced, thus reducing disturbances in the removal of reject from the pulper and in the operation of the rest of the pulper section. Further, due to the solution, it is possible to control the adjustment of the physical properties of the ragger rope, such as its diameter, weight, and length, in such a manner that an even and trouble-free removal of the ragger rope from the pulper may be achieved.
- the weight of the ragger rope is measured by measuring the effect of the ragger rope on the ragger.
- the effect of the ragger rope on the ragger it is possible to measure for instance the compression stress caused by the ragger rope on the front part of the frame structure of the ragger or the tensile stress caused by the ragger rope on the back part of the frame structure of the ragger, whereby the required measuring instruments are very simple and easily maintained or replaced.
- the figure is a partly sectional schematic side representation of a pulper 1, ragger 2, cutter 3, and equipment for controlling the ragger 2.
- fibre material fed into the pulper is defibrated with a rotor (not shown for the sake of clarity) and mixed with water fed into the pulper to form a fibre pulp suspension.
- a rotor not shown for the sake of clarity
- impurities such as pieces of plastic and metal, sand and glass
- elongated plastic material, pieces of plastic film, and metal wires tend to intertwine or attach to each other to, thus, form a ragger rope 4 or reject rope 4 or rope 4.
- ragger rope 4 is fed from the pulper 1 to the ragger 2 having a drawing roll 5 that is rotated by a very schematically presented motor 6.
- the ragger 2 often also includes a press roll 15 that presses toward the drawing roll 5 and acts as a counterpart for the drawing roll 5.
- the task of the ragger 2 is to pull the ragger rope 4 out of the pulper 1 and, thus, prevent the reject material in the ragger rope 4 from moving on in the pulping process.
- the pieces of the ragger rope 4 are, in turn, led away from the cutter 3 through a reject port 8 for further processing.
- the pulper 1 is typically a low-consistency pulper in which the consistency of the fibre pulp suspension being defibrated is typically approximately 5% or less, since in high fibre pulp suspension consistencies the formation of the ragger rope 4 abates or does not take place.
- the general structure and operating principle of the system formed by the pulper 1 , ragger 2, and cutter 3 is generally known to a person skilled in the art, and they are not discussed herein in more detail.
- the figure further shows a measuring device 9 of the ragger rope 4 thickness T arranged to optically monitor the ragger rope 4.
- the measuring device 9 may comprise software or other necessary means for determin- ing the value of the ragger rope 4 thickness T on the basis of the optical monitoring of the ragger rope 4.
- the measuring device 9 thus forms a measuring element that generates a measuring signal, on the basis of which the thickness of the ragger rope 4 may be determined.
- the value of the ragger rope 4 thickness T is transferred to a control unit 10 that, on the basis of the value, controls the rotating rate of the ragger 2 drawing roll 5 and, consequently, the rate of travel of the ragger rope 4 by adjusting the operation of the motor 6 or a frequency converter possibly controlling it by means of a control signal CS.
- the measuring device 9 may transfer to the control unit 10 only the one or more measuring signals it has measured, on the basis of which the control unit 10 with its software or other means may determine the thickness T of the ragger rope 4.
- the measurement of the ragger rope thickness may for instance be based on known computer vision sensors and related systems in which a picture is taken of the ragger rope and its thickness is calculated on the basis of the outlines formed by the ragger rope in the picture.
- An example of another useful solution for the measurement of the ragger rope thickness is to use photocells, several of which may be placed side by side, and to measure to what extent the ragger rope overshadows the travel of light in the measuring. These measurements may naturally also be made in two different directions, whereby the dimension of the ragger rope in its other direction is also verified.
- Computer vision sensors and related systems may also be used to measure the rate of travel of the ragger rope 4.
- the rate of travel is determined for example by comparing pictures taken at specific intervals and by measuring the progress of a picture or a detail thereof from consecutive pictures during a period of time.
- the adjustment of the ragger rope rate of travel may also be implemented on the basis of such a measuring arrangement.
- the rate of travel of the ragger rope is proportional to the rotating rate of the drawing roll 5 of the ragger 2, so instead of the ragger rope rate of travel, it is possible to determine the rotating rate of the drawing roll that may be considered a property of the ragger 2 operation and measured using for instance a device for measuring the rotating rate located in the motor 6.
- a property of the ragger rope 4 for instance the diameter, that is, thickness, of the ragger rope 4 or the weight of the ragger rope 4, in which case these measuring results, when transmitted to the control system, form together an adjustment base for adjusting the rate of travel of the ragger rope 4, for instance.
- the rate of travel of the ragger rope 4 may be slowed down by slowing down the rotation rate of the ragger 2 drawing roll 5 with the intention of obtaining a thicker and, therefore, more pull-resistant ragger rope 4 to, thus, avoid the breaking of the ragger rope 4 and a disturbance in reject removal.
- the figure further shows a compression stress measuring element 12 located in the frame structure 11 of the ragger 2, in the front part of the frame structure, that is, on the pulper 1 side thereof.
- the compression stress measuring element 12 may in itself be a measuring member or comprise a measuring member, such as a strain gauge or power rating device, that is arranged to measure the compression effect or compression stress caused by the ragger rope 4 on the front part of the ragger 2 frame structure 11 , that is, on the pulper 1 side thereof; the effect or stress representing the weight W of the ragger rope 4.
- the ragger rope 4 causes a compression effect or compression stress on the front part of the ragger 2 frame structure, because the ragger rope 4 supports itself on the front part of the ragger 4 frame structure 11 or on a part in connection therewith, when it travels from the pulper 1 to the ragger 2.
- the compression stress measuring element 12 may comprise software or other necessary means for determining the weight W of the ragger rope 4 and for transmitting it to the control unit 10. Alternatively, the compression stress measuring element 12 may transmit to the control unit 10 only the measured signal representing the compression effect, on the basis of which the control unit 10 determines the weight W value of the ragger rope 4 and controls the rotation rate of the ragger 2 drawing roll 5 by adjusting the operation of the motor 6, or the frequency converter possibly controlling it, by means of a control signal CS, thus adjusting the rate of travel of the ragger rope 4 from the pulper
- the figure further shows a tensile stress measuring element 13 located in the back part of the ragger 2 frame structure 11 , that is, to a part opposite to the pulper 1.
- the tensile stress measuring element 13 may in itself be a measuring member or comprise a measuring member, such as a strain gauge, that is arranged to measure the tensile effect or tensile stress caused by the ragger rope 4 on the back part of the ragger 2 frame structure 11 , which represents the weight W of the ragger rope 4.
- the ragger rope 4 causes a tensile stress effect on the back part of the ragger 2 frame structure, because the ragger rope 4 supports itself on the back part of the ragger 4 frame structure
- the tensile stress measuring element 13 may comprise software or other necessary means for determining the weight W of the ragger rope 4 and for transmitting it to the control unit 10.
- the tensile stress measuring element 13 may transmit to the control unit 10 only the measured signal representing the tensile stress effect, on the basis of which the control unit 10 determines the weight W value of the ragger rope 4 and controls the rotation rate of the ragger 2 drawing roll 5 by adjusting the operation of the motor 6, or the frequency converter possibly controlling it, by means of a control signal CS, thus adjusting the rate of travel of the ragger rope 4 from the pulper 1 to the ragger 2.
- the weight of the ragger rope may also be measured by directing the ragger rope 4 to the ragger 2 over a roll system, curved plate, or pipe to which weighing of the ragger rope 4 is combined using for instance a spring balance or some other measuring element suitable for weight measurement.
- One way of determining the weight W of the ragger rope 4 is to arrange the measurement of the torsional moment of the ragger rope drawing roll 5, from which the weight of the ragger rope may be calculated.
- the torsional moment TM which may also be considered a property of the ragger operation, may be measured for instance by measuring the power of the motor driving the drawing roll and by calculating the torsional moment of the drawing roil on the basis of the motor power consumption.
- the torsional moment may also be measured by means of a torsional moment measuring device arrange- able between the ragger rope drawing roll and its driving device and shown schematically in the figure and indicated by reference number 16.
- the figure further shows a vibration measuring element 14 located in the front part of the ragger 2 frame structure 11, that is, on the pulper 1 side part.
- the vibration measuring element 14 may in itself be a measuring member or comprise a measuring member, such as an acceleration sensor, that is arranged to measure the oscillation or vibration V caused by the ragger rope 4 on the ragger 2 frame structure 11.
- the vibration caused by the ragger rope 4 on the ragger 11 frame structure is due to the vibration of the ragger rope 4, which in turn is caused by the ragger rope 4 coming close to the pulper 1 rotor.
- the vibration measuring element 14 may comprise software or other necessary means for determining the value representing the vibration V and for transmitting it to the control unit 10. Alternatively, the vibration measuring element 14 may transmit to the control unit 10 only the measured signal representing vibration, on the basis of which the control unit 10 may adjust the rate of travel of the ragger rope 4 from the pulper 1 to the ragger 2 by controlling the rotation rate of the ragger 2 drawing roll 5 by adjusting the operation of the motor 6 or a frequency converter possibly controlling it by means of a control signal CS.
- the rotation rate of the ragger 2 drawing roll 5 is increased with the intention of pulling the ragger rope 4 faster out of the pulper 1 and thus further away from the pulper 1 rotor, thus shortening the length of the ragger rope 4 and avoiding the breaking of the ragger rope 4. If the vibration of the ragger 2 frame structure 11 is very slight or minor, the rotation rate of the ragger 2 drawing roll 5 may be decreased with the intention of enhancing the formation of the ragger rope 4 and thus reject removal from the pulper 1.
- the length L of the ragger rope 4 may also be considered a property of the ragger rope 4.
- the length L of the ragger rope may be determined for instance with a length measuring element 17 that may be located on the bottom of the pulper 1 and that on the basis of capacitance, for instance, measures the length L of the ragger rope 4 through the bottom of the pulper 1 , and on the basis of the length, the rate of travel of the ragger rope 4, for example, may be adjusted.
- the length L of the ragger rope 4 may also be determined by means of the weight W, average diameter D, and density p of the ragger rope 5 with the formula
- the weight W of the ragger rope 4 may be determined by the methods described above, for instance, and the average diameter D may be determined on the basis of the above-mentioned measurement of the thickness T of the ragger rope 4.
- the density value of a ragger rope with an approximately similar diameter removed earlier from the pulper may, in turn, be used as the value of the ragger rope 4 density p.
- the density value it is also possible to experimentally define one or more coefficiencies depending on the ragger rope diameter, in which case by multiplying the quotient of the square of the ragger rope weight and diameter with the coefficient, it is possible to determine the length L of the ragger rope 4.
- the stiffness or elasticity of the ragger rope or a combination thereof may also be measured as its property for the purpose of determining the rate of travel of the ragger rope.
- the implementation may comprise a pusher, for instance, in which a force acting in the transverse direction is directed to the ragger rope and an offset, bend, or flex of the ragger rope caused by the force is measured, and, on the basis of the measuring result or a combination of measuring results, the rate of travel of the ragger rope or the operation of the pulper is set by means of the control system in such a manner that the ragger rope does not break.
- the control system may be set to interpret the ragger rope as stiff, when the offset or bend caused by the transverse-direction force is small, and to set a high rate of travel for the ragger rope.
- the control system may be set to interpret the ragger rope as elastic, when the offset or bend caused by the transverse-direction force is big, and to set a low rate of travel for the ragger rope.
- the system may be set to adjust either a high ragger rope rate of travel or a low ragger rope rate of travel depending on the material being processed in the pulper.
- the presented pusher-based measuring arrangement for ragger rope stiffness, bending or elasticity may be arranged to take place at a press roll 15, for example, or as a separate measuring arrangement.
- the pulping operation may be adjusted for instance by controlling the rotation rate of the pulper 1 rotor by controlling the operation of the motor 18 or a frequency converter possibly controlling it by means of a control signal CS'. By altering the rotation rate of the pulper 1 rotor, it is possible to affect the rate of growth of the ragger rope 4.
- the pulping operation may also be controlled by adjusting the amount of raw material, that is, typically the recycled fibre material, fed into the pulper 1. This may be done for instance by controlling the rate of a transporter 19 feeding raw material into the pulper 1 through a control signal CS" or by controlling the operation of some other device feeding raw material into the pulper 1 in such a manner that the amount of raw material fed into the pulper 1 may be adjusted. By adjusting the amount of raw material fed into the pulper 1 , it is possible to influence the amount of reject entering the pulper with the raw material and, consequently, the intensity of the formation of the ragger rope.
- the ragger rope 4 of the ragger 2 By measuring at least one property of the ragger rope 4 of the ragger 2 and/or at least one effect caused by the ragger rope 4 on the rag- ger 2 and/or the rate of travel of the ragger rope and/or a property of the operation of the ragger, and by adjusting the rate of travel of the ragger rope or the operation of the pulper on the basis of the measurement, the ragger rope 4 is removed from the pulper 1 in a controlled manner, or its formation in the pulper and thus also reject handling may be influenced while taking into consideration the variation of impurities in the raw material.
- the solution makes it possible to limit for example the thickness, weight and/or length of the ragger rope 4, or to keep the variation in said properties small, and to adjust said properties by altering for instance the removal rate of the ragger rope 4. Thanks to the solution, breakings of the ragger rope 4 may be reduced or avoided altogether and, in addition, variation of the ragger rope thickness, weight, and length may be reduced, thus reducing disturbances in reject removal from the pulper and making reject removal from the pulper even and controlled. When there are less disturbances in reject removal from the pulper, there are also less disturbances in the different steps of the pulping process following the pulper, whereby the solution provides disturbance-reducing multiplicative effects in the operation of the rest of the pulper area.
- the features disclosed in this application may be used as such regardless of the other features.
- the features disclosed in this application may, if necessary, also be combined to form different combinations.
- the adjustments may be based on one measurable quantity only or on several simultaneously measurable quantities.
- the adjustments may be implemented by means of controls affecting the rate of travel of the ragger rope or the operation of the pulper only or by adjusting simultaneously both the ragger rope rate of travel and the operation of the pulper.
- the compression stress directed by the ragger rope 4 to the front part of the ragger 2 frame structure 11 it is possible to measure at least one of the following properties: the compression stress directed by the ragger rope 4 to the front part of the ragger 2 frame structure 11 , the tensile stress directed by the ragger rope 4 to the back part of the ragger frame structure 11 , oscillation or vibration caused by the ragger rope 4 on the ragger 2 frame structure.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Paper (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009801349464A CN102144149B (en) | 2008-09-05 | 2009-09-03 | Method and equipment for controlling reject handling in pulping process |
DE112009002115.8T DE112009002115B4 (en) | 2008-09-05 | 2009-09-03 | Method and apparatus for controlling the handling of rejects in a pulper process |
ATA9326/2009A AT509144B1 (en) | 2008-09-05 | 2009-09-03 | METHOD AND DEVICE FOR CONTROLLING THE HANDLING OF PREPARATION IN A POWDER PROCESS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20080507 | 2008-09-05 | ||
FI20080507A FI120710B (en) | 2008-09-05 | 2008-09-05 | Procedure and apparatus for controlling reject processing in pulp manufacturing process |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010026295A1 true WO2010026295A1 (en) | 2010-03-11 |
Family
ID=39852171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2009/050706 WO2010026295A1 (en) | 2008-09-05 | 2009-09-03 | Method and equipment for controlling reject handling in pulping process |
Country Status (5)
Country | Link |
---|---|
CN (1) | CN102144149B (en) |
AT (1) | AT509144B1 (en) |
DE (1) | DE112009002115B4 (en) |
FI (1) | FI120710B (en) |
WO (1) | WO2010026295A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012062563A1 (en) | 2010-11-09 | 2012-05-18 | Voith Patent Gmbh | Rope winch control |
CN102645291A (en) * | 2012-05-04 | 2012-08-22 | 山东环科环境工程有限公司 | Fault predication and warning method and device for underwater mixing and impelling devices |
WO2017133940A1 (en) * | 2016-02-01 | 2017-08-10 | Meri Environmental Solutions Gmbh | Apparatus and method for processing a rope formed in a pulper |
EP4001503A1 (en) * | 2020-11-16 | 2022-05-25 | Valmet Technologies Oy | Ragger |
WO2022174051A1 (en) * | 2021-02-12 | 2022-08-18 | Kadant Black Clawson Llc | Ragger systems and methods for removing solid debris from pulping processes |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104846677B (en) * | 2015-05-26 | 2017-01-04 | 浙江康诚工业产品设计有限公司 | A kind of pulp production device |
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Also Published As
Publication number | Publication date |
---|---|
CN102144149A (en) | 2011-08-03 |
FI20080507A0 (en) | 2008-09-05 |
CN102144149B (en) | 2013-03-27 |
DE112009002115T5 (en) | 2011-07-07 |
AT509144A2 (en) | 2011-06-15 |
DE112009002115B4 (en) | 2018-01-04 |
AT509144A3 (en) | 2012-12-15 |
FI120710B (en) | 2010-01-29 |
AT509144B1 (en) | 2013-02-15 |
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