EP3452657A1 - Verfahren zur steuerung einer vorrichtung zur behandlung von faserstoff - Google Patents
Verfahren zur steuerung einer vorrichtung zur behandlung von faserstoffInfo
- Publication number
- EP3452657A1 EP3452657A1 EP17724321.9A EP17724321A EP3452657A1 EP 3452657 A1 EP3452657 A1 EP 3452657A1 EP 17724321 A EP17724321 A EP 17724321A EP 3452657 A1 EP3452657 A1 EP 3452657A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- treatment
- power
- gap
- measured
- values
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002657 fibrous material Substances 0.000 title claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0018—Paper-making control systems controlling the stock preparation
Definitions
- the invention relates to a method for controlling a device for the treatment of pulp based at least partially on their idle power, wherein the device has a housing in which a first treatment tool and a second treatment tool is arranged, the treatment tools are each mounted on a base plate, a rotationally symmetric Have shape, are arranged coaxially to each other, rotate relative to each other about a common axis and limit a radially flowed through by the fiber material treatment gap, the gap width is changed by an axial displacement of at least one base plate of a treatment tool.
- Devices of the above-mentioned Art be z. B. used to improve the quality of pulp, TMP or pulp, which was obtained from waste paper.
- pulp fibers i. To mill fresh pulp and / or waste paper fibers in order to achieve the desired properties, in particular in terms of strength, porosity, formation and surface in the fibrous web produced therefrom.
- the refiners used for this purpose because of the relatively rapid wear of the grinding surfaces, are formed by interchangeable grinding sets screwed to the corresponding base plate.
- the grinding sets must be optimally adapted to the pulp to be treated, also to prevent excessive wear of the sets.
- an optimal use of the available grinding surface is sought.
- the object of the invention is to enable as simple as possible a safe and efficient operation of these devices. According to the invention, this object is achieved in that measured over the life of at least one treatment tool several times at least one value of idle power in the presence of pulp or water during opening and / or closing of the treatment gap stored in a memory of the controller and alone or in conjunction with other values is evaluated by the controller.
- the idling performance of the device changes during the service life of the treatment tools. With increasing wear of the profile of the treatment tools, the idle power is reduced relatively strong.
- the idling power refers to the throughput amount of pulp per unit time and is usually between 40 and 250, in particular between 40 and 150 kWh, but very important.
- At least one value of the no-load power measured when opening and / or closing the treatment gap should be used directly or indirectly, for example over average values or the combination with other parameter values for controlling the overall power and thus also the specific power of the device. So far, it has been customary to determine the idle power of the device during commissioning and to save it for the control or to use a predetermined value for this purpose.
- the total power consumed is composed of the no-load power and the specific power of the device relevant to the desired treatment intensity.
- the most accurate possible determination of the idling power is sought, it may be advantageous to carry out the measurement of the idling power at a constant gap width.
- the value of the idling power is measured several times, preferably at certain time intervals, for example of a few seconds, and stored in the memory.
- a substantial increase in the measurement accuracy can be achieved by forming at least a part of the values of the idle power measured when opening and / or closing the treatment gap at least a first average value and storing it in the memory as the current idling power.
- a second average value should be formed at least from part of the values of the idle power measured when opening and / or closing the treatment gap and stored in the memory instead of the first average value as current idling power, but values are disregarded that deviate more than 20% from the corresponding first average. Because of the relatively frequent delivery of values for the current idling power, old values should be disregarded so that the control of the device is based on one or more of the last measured values of idle power and / or their first averages and / or their second averages.
- the essential parameters such as pressure, flow and pulp consistency of the pulp suspension should be within the normal operating range.
- one treatment tool should rotate and the other not, with at least one treatment tool being mounted axially displaceable.
- treatment tool and base plate can also be made in one piece.
- LC low-consistency
- the pulp may in particular also be TMP, high-yield pulp, MDF pulp, wood chips or the like. Substances act.
- Figure 1 a schematic cross section through a refiner
- While a treatment tool 3 is stationary and thus designed as a stator, the other treatment tool 4 is rotatably mounted in the housing 2 of the refiner.
- the treatment tools 3,4 each have a rotationally symmetrical shape, wherein
- the two annular grinding surfaces are arranged parallel to each other and the gap distance between them via an axial displacement, usually of the rotating treatment tool 3 is adjustable.
- the rotating grinding surface is here moved in the direction of rotation by a rotatably mounted in the housing 2 shaft. This shaft is driven by an existing also in the housing 2 drive.
- the fiber suspension 1 to be ground passes via an inlet through the center into the grinding gap 6 between the grinding surfaces of the two treatment tools 3, 4.
- the fiber suspension 1 passes the cooperating grinding surfaces radially outwards and leaves the adjoining annular space through a drain.
- Both grinding surfaces are each formed by a plurality of grinding plates, which extend over in each case a peripheral segment of the corresponding grinding surface.
- the grinding plates result in a continuous grinding surface.
- the refining plates and thus also the refining surfaces are generally formed by a plurality of substantially radially extending grinding bars 9 and intermediate grooves. Not shown are the means known per se, with which the rotating treatment tool 4 axially displaced and the extent of this axial displacement is measured.
- the non-rotating treatment tool 3 does not change its axial position.
- the treatment tools 3,4 are mounted on corresponding base plates 7,8.
- the treatment gap 6 can not only be perpendicular but, as in the case of cone refiners, also inclined to the axis of rotation 5.
- Figure 2 illustrates the change in the real idle power P Lr eai of the refiner over the operating time t, which increases with increasing operating time t and Thus, increasing wear of the treatment tools 3.4 largely continuously reduced.
- the total power P G supplied to the treatment device is composed of the no-load power P Lr eai and the specific power P s responsible for the treatment intensity of the pulp 1, ie the grinding power.
- the updating of the value of the idle power P L stored for the control of the treatment device is generally carried out in the presence of pulp 1 during opening and / or closing of the treatment gap 6 under normal operating parameters such as pressure, flow and consistency.
- the idling power P L of the treatment device is measured in each case several times and at specific time intervals of approximately 2 s and stored as values of the no-load power P L in the memory.
- a first average value is formed by the values of the idle power P L measured when opening or closing the treatment gap 6. From these measured values of the idling power P L , a second average value is then formed and stored, taking into account values which deviate more than 20% from the corresponding first average value. If a second average value for the opening and a second average value for the closing of the treatment gap 6 are calculated, a common, second average value for the control is formed from both.
- the second average value of the idle power P L as the basis for the control of the treatment device, larger measurement errors can be excluded. This takes into account the fact that with increasing proximity to the closed treatment gap 6, the power consumption increases and is significantly above the idle power P L.
- the control performs an opening and closing of the treatment gap 6 specifically for determining the current idling power P L.
- the real idle power P Lr eai deviates too much from the stored in the control of the treatment device idle power P L.
- the no-load power P L is measured when the treatment gap 6 is closed and stored in the memory as a starting value for the control.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016207726.0A DE102016207726A1 (de) | 2016-05-04 | 2016-05-04 | Steuerung der Faserstoffbehandlung |
PCT/EP2017/060053 WO2017191030A1 (de) | 2016-05-04 | 2017-04-27 | Verfahren zur steuerung einer vorrichtung zur behandlung von faserstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3452657A1 true EP3452657A1 (de) | 2019-03-13 |
EP3452657B1 EP3452657B1 (de) | 2019-12-25 |
Family
ID=58737550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17724321.9A Active EP3452657B1 (de) | 2016-05-04 | 2017-04-27 | Verfahren zur steuerung eines refiners zur behandlung von faserstoff |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3452657B1 (de) |
CN (1) | CN109154142B (de) |
DE (1) | DE102016207726A1 (de) |
WO (1) | WO2017191030A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019101808A1 (de) * | 2019-01-25 | 2020-07-30 | Voith Patent Gmbh | Steuerung der Faserstoffbehandlung |
DE102021125006A1 (de) | 2020-09-30 | 2022-03-31 | Voith Patent Gmbh | Steuerung der Faserstoffbehandlung |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4184204A (en) * | 1978-10-06 | 1980-01-15 | Beloit Corporation | Programmable refiner controller |
US4661911A (en) * | 1985-01-31 | 1987-04-28 | Beloit Corporation | Adaptive constant refiner intensity control |
JP4823474B2 (ja) * | 2001-03-12 | 2011-11-24 | ノーウォーク インダストリアル コンポーネンツ, リミティッド ライアビリティ カンパニー | ディスク型パルプミルのディスク間ギャップを推定する方法 |
SE525980C2 (sv) * | 2003-10-06 | 2005-06-07 | Metso Paper Inc | Malelement |
EP2562307A1 (de) * | 2011-08-26 | 2013-02-27 | Officine Airaghi Srl | Ersatzteile für Scheibenrefiner zur Papierherstellung |
CN103938479B (zh) * | 2014-05-09 | 2016-03-02 | 天津科技大学 | 一种可调间隙的双锥形磨浆机 |
-
2016
- 2016-05-04 DE DE102016207726.0A patent/DE102016207726A1/de not_active Withdrawn
-
2017
- 2017-04-27 EP EP17724321.9A patent/EP3452657B1/de active Active
- 2017-04-27 CN CN201780027240.2A patent/CN109154142B/zh active Active
- 2017-04-27 WO PCT/EP2017/060053 patent/WO2017191030A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
CN109154142A (zh) | 2019-01-04 |
WO2017191030A1 (de) | 2017-11-09 |
EP3452657B1 (de) | 2019-12-25 |
CN109154142B (zh) | 2021-02-05 |
DE102016207726A1 (de) | 2017-11-09 |
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