WO2023208708A1 - Hydrocyclone pour le nettoyage d'une suspension de fibres - Google Patents

Hydrocyclone pour le nettoyage d'une suspension de fibres Download PDF

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Publication number
WO2023208708A1
WO2023208708A1 PCT/EP2023/060261 EP2023060261W WO2023208708A1 WO 2023208708 A1 WO2023208708 A1 WO 2023208708A1 EP 2023060261 W EP2023060261 W EP 2023060261W WO 2023208708 A1 WO2023208708 A1 WO 2023208708A1
Authority
WO
WIPO (PCT)
Prior art keywords
separation cone
marking
hydrocyclone
separation
cone
Prior art date
Application number
PCT/EP2023/060261
Other languages
German (de)
English (en)
Inventor
Elmar Ott
Sven EISENHAUER
Original Assignee
Voith Patent Gmbh
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 Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2023208708A1 publication Critical patent/WO2023208708A1/fr

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Classifications

    • 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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/06—Axial inlets

Definitions

  • the invention relates to a hydrocyclone for cleaning a fiber suspension.
  • the hydrocyclone has an inlet at an upper end and a contaminant discharge at a lower end.
  • Hydrocyclones known as heavy part cleaners are used to separate heavy parts in the size of 0.1-3 mm from the fiber suspension. Heavy particles are more dense than water and therefore do not float. Heavy particles with a density of 2 grams/cm 3 and above and a diameter of 0.1 mm can be easily separated using a hydrocyclone. The smaller the heavy particles and the smaller the difference in density compared to water, the heavier the heavy particles can be separated in a hydrocyclone.
  • the heavy particles are also referred to as contaminants.
  • contaminants in addition to heavy parts, there are also light parts, which are also referred to as contaminants.
  • Such heavy parts have a harmful influence in the paper manufacturing process.
  • the term contaminants refers solely to the heavy parts.
  • Hydrocyclones have the task of separating heavy particles as contaminants in the size of 0.1 - 3 mm from the fiber suspension in order to prevent the harmful effects of heavy particles on the paper manufacturing process.
  • heavy particles can be present in the fiber suspension.
  • heavy parts include sand, glass splinters, tiny metal parts, metal dust, heavy plastics, rubber parts, silicone parts, soot, bone splinters, rust particles and paint splinters.
  • the separation of heavy particles from the fiber suspension works via centrifugal forces.
  • the centrifugal forces act on the introduced hydrocyclone Fiber suspension.
  • the fiber suspension is introduced into the hydrocyclone under pressure tangentially at the inlet nozzle of the head piece.
  • the inlet diameter narrows to a nozzle. The lower the inlet material density, the better the separation efficiency.
  • the inlet pressure is converted into flow velocity in the nozzle. This causes the fiber network to be torn open after the nozzle and heavy parts can be removed from the fiber network. The heavy parts react to centrifugal forces and are pressed against the wall of the hydrocyclone.
  • abrasion-resistant materials such as ceramics
  • ceramics are particularly cost-intensive.
  • such materials are often very sensitive and there is a risk of tearing during assembly and processing.
  • a hydrocyclone for cleaning a fiber suspension is known from US 2009/0025899. Measures are proposed which make it possible to easily determine whether a breakthrough has occurred in the housing. Furthermore, the housing wall can be easily checked to see whether it still has sufficient strength so that there is no risk of a breakthrough. If the thickness of the housing wall is so small due to abrasion that there is a risk of breakthroughs, the housing or a housing part must be replaced. This is achieved by at least the lower housing part or a casing surrounding it being made of a transparent or a transparent material, in particular made of a transparent or a transparent plastic material. Due to the transparency or translucency of the casing, it is always possible to see whether a breakthrough has occurred.
  • hydrocyclones which have chambers outside of the separation chamber, with a leak flowing into these outer chambers and not emerging from the hydrocyclone.
  • the outer chambers can fill with suspension and operation can even continue, as described in DE 29 46 157.
  • DE 31 19 663 describes a hydrocyclone with an outer chamber that covers a weakening of the hydrocyclone.
  • the weakening provides a predetermined breaking point to make it easier to locate and repair a breakthrough.
  • a hydrocyclone for separating abrasive contaminants from a liquid is known from EP 429 919.
  • the hydrocyclone comprises a substantially conical separation chamber having an outer wall which is subject to wear on its inner surface due to the abrasive contaminants and wherein the hydrocyclone is provided with a section of reduced wall thickness.
  • This section with reduced wall thickness is intended for the formation of a wear opening in order to simplify the localization of wear.
  • the wear openings are arranged vertically on one side of the hydrocyclone. To close a leak localized in this way, the wear openings in the outer surface of the outer wall are designed in such a way that a sealing member for closing the wear opening passes through the wear opening can be held. The leakage can be stopped by using a sealing device.
  • a hydrocyclone with an inner replaceable coating is known from WO 2019/180549.
  • the thickness of the coating is recorded by an ultrasonic sensor. If no section of the inner coating has a thickness that exceeds a predetermined limit, a service signal is issued via the control unit.
  • the invention is based on the object of improving the operational reliability of hydrocyclones used as heavy parts cleaners.
  • the object is achieved by a separation cone for a hydrocyclone with the features according to claim 1 and solved by a hydrocyclone according to claim 10 and a method for operating the hydrocyclone according to claim 13.
  • the invention is characterized in that the separation cone is provided with a wear indicator which extends axially over at least a portion of the separation cone for detecting the wall thickness of the separation cone by reflecting radiation.
  • the inner contour of the deposition cone can be detected by the reflection of radiation. This makes it possible to detect wear on the separation cone. Maintenance can be scheduled early, which can prevent leaks.
  • the separation cone can also be used and replaced as a spare part, making it easy to retrofit hydrocyclones with a wear indicator.
  • the separation cone tapers in the direction of its axial extent. Hydrocyclones with separation cones can be arranged both vertically and horizontally.
  • the wear indicator comprises a marking.
  • the marking makes it easier to determine the wall thickness.
  • the marking is arranged on the outer surface of the separation cone.
  • the marking of the wear indicator itself is therefore not subject to wear. It has proven to be advantageous to capture an image of the marking in reflection. This allows a contour of the inner surface of the separation cone to be captured.
  • Such a wear indicator reliably and easily provides an indication of wear by detecting the wall thickness.
  • the separation cone is at least partially transparent.
  • the wall thickness can be determined particularly easily by recording an image of the marking, for example a mirror image or shadow image. This simple type of determination is a particularly cost-effective solution. It is even possible for the human eye to detect it, which is a particularly favorable variant.
  • a radiation source can be provided, with the radiation being reflected on the inner surface of the deposition cone.
  • a sensor can be provided to record the reflected radiation. This makes a particularly precise image possible. Pulsed or clocked irradiation is also possible, which makes it possible to specifically minimize interference signals.
  • a colored marking in particular has proven to be advantageous as a marking. In particular, contrasting colors compared to the color of the suspension have proven to be suitable. Signal colors such as red are particularly good.
  • a partially transparent red marking forms a mirror image that is easily visible to the human eye.
  • a plurality of markings are provided at different vertical heights of the separation cone in order to detect wear at different heights.
  • the marking and/or an image of the marking can be recorded and a wear situation can be recognized early on by a control or by personnel based on the image.
  • a radiation source is provided for irradiating the marking of the wear indicator. This makes it possible to determine wear under constant conditions. Radiation that is not visible to the eye can also be used, which allows the wall thickness and thus wear to be reliably determined through illumination or incident light.
  • the material used for the deposition cone and the radiation source can also be coordinated with one another, so that good contour detection of the inner contour of the deposition cone is possible based on the radiation reflected on the inner surface.
  • it can be provided to move a marking with a light source and a detector around the cone in order to record a complete image of the inner contour and thus of the wear.
  • FIG. 1 schematic representation of a hydrocyclone with a transparent separation cone
  • Fig. 2 Separation cone with line marking before use
  • Fig. 3 Separation cone with line marking with wear
  • Fig. 4 Separation cone with solid-colored marking as a wear indicator
  • a hydrocyclone 1 is shown in Figure 1. Suspension to be cleaned is fed to the hydrocyclone 1 via an inlet 3. This is done over the head 5 of the hydrocyclone 1 Suspension passed into a main body 7. The suspension flows through the head 5 in a ring shape into a main body 7. The ring flow 17 is shown by arrows. A central flow is shown by arrows 19.
  • the main body 7 is connected to a separation cone 9.
  • the separation cone 9 is made of a transparent material and has a wear indicator 31.
  • the separation cone 9 could also be formed in one piece with the main body.
  • the wear indicator includes a marking 33.
  • the separation cone 9 is connected at its lower end to a lower outlet 11.
  • An overflow, also referred to as heavy part reject 21, is discharged via the lower outlet 11.
  • the lower outlet 11 is provided with a feed 25 for backwash water 27.
  • the flow visible in the separation cone can also be used to adjust the flow of the backwash water. Incipient constipation can also be detected early.
  • the separation cone is imaged so that remote diagnosis is also possible.
  • heavy particles can be present in the fiber suspension.
  • heavy parts include sand, glass splinters, tiny metal parts, metal dust, heavy plastics, rubber parts, silicone parts, soot, bone splinters, rust particles and paint splinters.
  • Heavy particles are more dense than water and therefore do not float.
  • Heavy particles with a density of 2 grams/cm 3 and above and a diameter of 0.1 mm can be separated very easily.
  • the separation of heavy particles from the fiber suspension works via centrifugal forces, with the centrifugal forces in the hydrocyclone acting on the suspension introduced.
  • the fiber suspension is introduced into the hydrocyclone under pressure tangentially at the inlet nozzle of the head piece.
  • the inlet diameter narrows to a nozzle.
  • the inlet material density should not exceed 2.5%. The lower the inlet material density, the better the separation efficiency.
  • the inlet pressure is converted into flow velocity in the nozzle. This causes the fiber network to be torn open after the nozzle and the heavy parts can be removed from the fiber network. The heavy parts react to centrifugal forces and are pressed against the inner surface 39, also referred to as the wall, of the hydrocyclone 1.
  • a spiral-shaped flow also known as annular flow 17, forms on the inner wall of the hydrocyclone 9.
  • the flow is directed downwards in a spiral into the separation cone 7. During this, the fibers free of heavy parts arrive in the middle area and form the core flow 19.
  • the core flow 19 reaches the upper outlet 15, see the flow arrows 19 in Fig. 1.
  • the upper outlet 15 represents the acceptance material discharge 23.
  • a marking 33 attached to the outer surface 38 of the transparent separation cone 9 is shown here only as an example.
  • the marking of the wear device is mirrored on the inner surface 39, 39 'see Figure 2 and Figure 4, of the separation cone 9.
  • the marking 33 in particular colored marking in strip form, is now reflected on the inner surface 39 of the reduced wall thickness 37.
  • the wall thickness 37 becomes smaller and smaller in individual sections.
  • the inner colored marking of the mirror image 34 comes closer and closer to the outer colored marking 33.
  • the space between the colored markings 31 and its mirror image shows the remaining wall thickness 37.
  • the separation cone 9 should be replaced at a distance of 1-2 mm.
  • the reflection can also be seen when wear occurs when the material of the separation cone 9 becomes cloudy or when the inner surface 39 is roughened on the inner surface 39. This also means that the Könen material remains partially transparent until the separation cone 9 is completely worn through. A reflection on the inner surface of 50% of the radiation irradiated onto the cone is sufficient if viewed with the human eye. When using a sensor, the reflected portion and the reflected intensity may be significantly lower.
  • an exchange can be planned and carried out. Since wear is to be expected particularly in the lower, tapered region of the separation cone 9, a marking 33 of the wear indicator 31 is positioned in the lower region, at least in the lower third of the separation cone 9. Here, the marking 33 extends over at least 20 cm of the axial height of the separation cone 9.
  • several markings 33 arranged spaced apart in the circumferential direction can be provided, not shown.
  • Several markings spaced apart in the vertical direction can also be provided. Since wear will occur more frequently, particularly in the lower area, and can also occur very selectively, there are several markings, particularly in the lower third of the separation cone Wear indicator provided. An inner surface showing noticeable wear is marked 39'.
  • FIG 2 an embodiment of a separation cone 9 is shown.
  • the separation cone consists of a transmitting material.
  • the marking 33 of the wear indicator 31 is applied, for example glued, to the outer surface 38.
  • a mirror image 34 of the marking 33 can be seen on the inner surface. This mirror image 34 can also be recorded by the image capture 43. If the marking itself is not partially transparent, a shadow image of the marking 33 for determining the wall thickness forms on the inner surface 39. In particular, a partially transparent red marking is easy to see, since red represents a good contrast to the fiber suspension in the separation cone.
  • markings 33 with an at least partially axial course can be provided as markings for the wear indicator.
  • the markings can have the following forms:
  • the above-mentioned marking 33 or markings of the wear indicator 31 can have the following attachment options:
  • - Marking may be recessed
  • - Marking can be or will be applied directly to the surface.
  • - Marking can be created by sticking foils and thicker molded parts.
  • - Markings can be in the form of one or more partial coloring of the separation cone.
  • the marking can have the following color scheme:
  • the marking can be designed in color, all known colors can be used, color contrasts to the color of the are particularly suitable
  • the marking can be transparent in color.
  • three grooves with a depth of 0.3 mm can be made in the transparent separation cones. These grooves can be colored. The color-transparent marking in the grooves serves as the basis for the wear indicator 31.
  • Method for detecting wear in a separation cone 9 of a hydrocyclone 1 can provide the step of attaching a marking to the hydrocyclone if no marking is yet present.
  • the wall thickness can be recorded by the marking itself and changing it or changing the mirror image of the marking. If the wall thickness falls below a predetermined level, a signal is output. It may be sufficient that a fall below the predetermined wall thickness is detected in only one area of the detected area. In order to minimize the number of incorrect signals, it can be provided that a minimum extent of a minimum detected wall thickness 37 must be recorded before a signal to indicate a wear state of the deposition cone 9 is generated.
  • a colored marking can be made there on the outer surface 38 of the Separation cone 9 can be pulled into this position using a waterproof pen, for example. This means that wear detection is also possible at this position. This can be done by staff in particular as part of an inspection.
  • an image sensor can be provided, by means of which an image capture of the marking 33 is carried out on request and/or automatically at predetermined time intervals.
  • the signals are evaluated in a controller 41. If a predetermined limit value is consistently undershot at a position and/or over a predetermined distance and/or over a predetermined period of time, a signal to initiate an exchange is output by the controller 41.
  • a radiation source 45 the radiation of which is reflected on the inner surface 39 of the deposition cone 9.
  • the reflected radiation is then recorded by a detector/image capture 43.
  • the radiation and material of the deposition cone should be well coordinated with one another in order to display the inner surface through the reflected radiation. Interfering radiation can be eliminated through pulsed irradiation.
  • a plastic can be used as the material for the transparent part of the separation cone 9. Glass can also be used.
  • the separation cone 9 is assigned an image capture 43 and a controller 41.
  • a radiation source 45 is assigned to the separation cone 9.
  • the image capture 43 records the marking 33 of the wear indicator 31 and determines the wall thickness over at least a portion of the axial extent of the separation cone 9.
  • the radiation source 45 can also be used to use radiation that is not visible to the human eye and is reflected on the inner surface.
  • the control outputs a signal to indicate a wear situation.
  • predetermined limit values are stored in the control. These limit values may depend on the material of the separation cone and lead times to be planned for maintenance. In the case of using radiation that is not visible to the eye, transparent refers to a material that is transparent to this radiation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un cône de séparation pour un hydrocyclone et un hydrocyclone. Le cône de séparation comporte une extrémité supérieure ouverte pour recevoir la suspension et une extrémité inférieure ouverte pour éliminer un rejet de parties lourdes. L'extrémité ouverte inférieure présente un diamètre inférieur à celui de l'extrémité ouverte supérieure. L'extrémité ouverte inférieure peut être reliée à une sortie inférieure (11) d'un hydrocyclone. Le cône de séparation est pourvu d'un indicateur d'usure (31) qui s'étend axialement au moins sur une section partielle du cône de séparation pour détecter l'épaisseur de la paroi du cône de séparation en réfléchissant le rayonnement.
PCT/EP2023/060261 2022-04-25 2023-04-20 Hydrocyclone pour le nettoyage d'une suspension de fibres WO2023208708A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022109895 2022-04-25
DE102022109895.8 2022-04-25

Publications (1)

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WO2023208708A1 true WO2023208708A1 (fr) 2023-11-02

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PCT/EP2023/060261 WO2023208708A1 (fr) 2022-04-25 2023-04-20 Hydrocyclone pour le nettoyage d'une suspension de fibres

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DE (1) DE102023109976A1 (fr)
WO (1) WO2023208708A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1417056B1 (de) * 1958-03-01 1970-08-06 Voith Gmbh J M Rohrschleuder zum Reinigen von Faserstoffaufschwemmungen
DE2946157A1 (de) 1978-11-16 1980-06-04 Celleco Ab Verfahren zum trennen von schleifenden teilchen enthaltenden materialmischungen in einer hydrozyklon-trennvorrichtung
DE3119663A1 (de) 1980-06-02 1982-01-28 Enso-Gutzeit Oy, 00160 Helsinki Hydrozyklon
US20090025899A1 (en) 2007-07-23 2009-01-29 Klaus Bartelmuss Apparatus for Cleaning a Fiber Suspension for a Papermaking Process
WO2015017902A1 (fr) * 2013-08-09 2015-02-12 Weir Minerals Australia Ltd Appareil séparateur à cyclone et procédés de production
WO2018029573A1 (fr) * 2016-08-10 2018-02-15 Flsmidth A/S Système de commande d'entretien en cas d'usure d'un hydrocyclone
WO2019180549A1 (fr) 2018-03-21 2019-09-26 Weir Canada, Inc. Appareil d'égalisation d'usure pour cyclones

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024755A (en) 1989-11-22 1991-06-18 Bird Escher Wyss Cone wear detection

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1417056B1 (de) * 1958-03-01 1970-08-06 Voith Gmbh J M Rohrschleuder zum Reinigen von Faserstoffaufschwemmungen
DE2946157A1 (de) 1978-11-16 1980-06-04 Celleco Ab Verfahren zum trennen von schleifenden teilchen enthaltenden materialmischungen in einer hydrozyklon-trennvorrichtung
DE3119663A1 (de) 1980-06-02 1982-01-28 Enso-Gutzeit Oy, 00160 Helsinki Hydrozyklon
US4358369A (en) * 1980-06-02 1982-11-09 Enso-Gutzeit Osakeyhtio Hydrocyclone
US20090025899A1 (en) 2007-07-23 2009-01-29 Klaus Bartelmuss Apparatus for Cleaning a Fiber Suspension for a Papermaking Process
WO2015017902A1 (fr) * 2013-08-09 2015-02-12 Weir Minerals Australia Ltd Appareil séparateur à cyclone et procédés de production
WO2018029573A1 (fr) * 2016-08-10 2018-02-15 Flsmidth A/S Système de commande d'entretien en cas d'usure d'un hydrocyclone
WO2019180549A1 (fr) 2018-03-21 2019-09-26 Weir Canada, Inc. Appareil d'égalisation d'usure pour cyclones

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NN: "KREBS SMARTCYCLONE™", 22 February 2008 (2008-02-22), XP055424785, Retrieved from the Internet <URL:http://www.flsmidth.com/~/media/PDF Files/Liquid-Solid Separation/Hydrocyclones/04206SmartCycloneSpecificationSheet.ashx> [retrieved on 20171114] *

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DE102023109976A1 (de) 2023-10-26

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