EP2497565B1 - Mischsilo - Google Patents

Mischsilo Download PDF

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Publication number
EP2497565B1
EP2497565B1 EP12158560.8A EP12158560A EP2497565B1 EP 2497565 B1 EP2497565 B1 EP 2497565B1 EP 12158560 A EP12158560 A EP 12158560A EP 2497565 B1 EP2497565 B1 EP 2497565B1
Authority
EP
European Patent Office
Prior art keywords
silo
mixing
chambers
granules
volume
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.)
Active
Application number
EP12158560.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2497565A1 (de
Inventor
Herbert Ungerechts
Hans-Jörg Frank
Christoph Schwemler
Reiner Horl
Hans-Jürgen THIEM
Markus Hagedorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer Intellectual Property GmbH
Original Assignee
Bayer Intellectual Property 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 Bayer Intellectual Property GmbH filed Critical Bayer Intellectual Property GmbH
Priority to PL12158560T priority Critical patent/PL2497565T3/pl
Priority to EP12158560.8A priority patent/EP2497565B1/de
Publication of EP2497565A1 publication Critical patent/EP2497565A1/de
Application granted granted Critical
Publication of EP2497565B1 publication Critical patent/EP2497565B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/82—Falling particle mixers, e.g. with repeated agitation along a vertical axis uniting flows of material taken from different parts of a receptacle or from a set of different receptacles
    • B01F25/822—Falling particle mixers, e.g. with repeated agitation along a vertical axis uniting flows of material taken from different parts of a receptacle or from a set of different receptacles the receptacle being divided into compartments for receiving or storing the different components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/714—Feed mechanisms for feeding predetermined amounts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7547—Discharge mechanisms characterised by the means for discharging the components from the mixer using valves, gates, orifices or openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
    • B08B9/0813—Cleaning containers having tubular shape, e.g. casks, barrels, drums by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/26—Hoppers, i.e. containers having funnel-shaped discharge sections
    • B65D88/32—Hoppers, i.e. containers having funnel-shaped discharge sections in multiple arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/0093—Devices for cleaning the internal surfaces of the container and forming part of the container

Definitions

  • the invention relates to a mixed silo for free-flowing finely divided solids, in particular for powdery, fibrous and / or granular mix, in particular plastic granules, especially suitable for mixing plastic granules, with excellent mixing quality at the same time simplified and improved washability to avoid cross-contamination.
  • the subject of the invention is a mixed silo for the homogenization of optionally inhomogeneous polymer granulate batches in the form of a product stream from a polymer granulate production.
  • thermoplastics in the reactor granular product is plasticized in an extruder and formed in a granulation into single strands, which are cut by means of a rotating knife in the granulator to granules.
  • this product can be compounded with other components.
  • Compounding in polymer processing is the preparation of the finished plastics molding compound, the compound, from the plastic raw materials with the addition of fillers and reinforcing agents, plasticizers, adhesion promoters, lubricants, stabilizers, etc.
  • the compounding takes place predominantly in extruders and comprises the process operations conveying , Melting, dispersing, mixing, degassing and pressure build-up.
  • the melt is then pressed through the openings of a nozzle plate, so that in the case of strand pelletizing first melt strands are produced, which then result in the granulation cylinder granules or cut in the case of Kopfgranul réelle directly at the exit to the nozzle plate and then lenses - or spherical granules result.
  • the granulation can be carried out, for example, in a liquid stream which cools the granules and largely avoids agglomeration. Subsequently, the granules are dried and sieved to deposit agglomerates formed despite cooling.
  • the product is usually conveyed pneumatically to a mixing silo.
  • the granules are homogenized in the mixing silo to compensate for fluctuations in the manufacturing process and optionally subsequently transported pneumatically into the storage silos.
  • the mixing silos known from the prior art are generally operated as a gravity mixer or Umisselzmischer.
  • Umticalzmischer For both types, there are numerous proposals in the prior art to achieve by appropriate installations in the silo container even with a single pass of the bulk material high mixing quality, ie a good homogenization of different and usually successively filled in the silo container bulk materials, or - in the case of Recirculating mixers - to keep the number of revolutions and thus the mixing time short.
  • the aim of all versions is to achieve an acceptable mixing quality with the lowest installation and operating costs and the simplest cleaning effort.
  • the show DE 12 98 511 and the EP 60 046 A1 each a mixed silo, whose interior is divided by radially extending from the container outer wall to its central axis, vertical plate segments in several chambers, which successively fill due to correspondingly stepped upper edges of the sheet segments in a suitable position of the filling opening according to the overflow principle, which often one - however batch size dependent - vertical premix instead of the otherwise occurring purely horizontal stratification is achieved.
  • JP 51 046753 U describes a mixed silo containing a container which is divided by vertically arranged, straight partitions in a plurality of silo chambers, and a manifold.
  • a further object of the invention was to provide a silo which, after completion of the emptying operation, is substantially free of residual quantities of the granules previously conveyed therein.
  • This mixed silo according to the invention makes it possible to avoid as far as possible the generation of very fine particles compared with a mixing silo known from the prior art while bleaching good or even improved homogenization. Furthermore, the use of a device for rinsing the Mischsilas, this easy and safe to clean any remaining in the silo granules and dust residues, so that contamination with subsequent granule lots can be ruled out with certainty.
  • the mixed silo can be used both for the homogenization of granules whose divergence is caused for example by the polymer granulate product stream due to the smallest fluctuations in the upstream process, as well as for the homogenization of various product granules (eg, blends).
  • Preferred polymer granules are polycarbonate granules of a homopolycarbonate or a copolycarbonate, in pure form or as a mixture with other components.
  • the polycarbonates may contain conventional additives as additional components, e.g. Mold release agents, flow aids, thermal stabilizers, UV and / or IR absorbers, flame retardants, dyes and fillers, and other polymers.
  • the polycarbonate granules can also be added to the conventional additives for these thermoplastics additives such as fillers, UV stabilizers, IR stabilizers, heat stabilizers, antistatic agents and pigments, colorants; if appropriate, the demolding behavior, the flow behavior, and / or the flame retardancy can be improved by adding external mold release agents, flow agents, and / or flame retardants (eg, alkyl and aryl phosphites, phosphates, phosphanes, low molecular weight carboxylic acid esters, halogen compounds, salts , Chalk, quartz powder, glass and carbon fibers, pigments and combinations thereof.
  • external mold release agents, flow agents, and / or flame retardants eg, alkyl and aryl phosphites, phosphates, phosphanes, low molecular weight carboxylic acid esters, halogen compounds, salts , Chalk, quartz powder, glass and carbon fibers, pigments and combinations thereof.
  • the mixed silo according to the invention must contain at least 2 chambers, but preferably more than 2 chambers, more preferably 6 chambers. These chambers may have different sizes, but preferably they should be the same size and also have the same height in the mixing silo.
  • the chambers are open within the silo at their upper and lower ends over the entire cross section. The respective lower ends of the chambers are adapted to the design of the conically narrowing silo. In the lowest point of the cone-shaped silo, into which all chambers open, a mixing space (1) is created in which the simultaneous confluence of all partial flows from all the filled chambers produces the homogenized polymer-granulate mixture which can be transferred from there to other storage or filling stations. Devices is transported.
  • the mixing chamber (1) can be shut off from the granulate removal line (2) through a fitting (3) so that defined granulate quantities can be stacked in the silo.
  • the partitions that form the silo chambers and extend from the central center tube to the silo inner wall are curved, such as in Fig. 1 , shown.
  • the partitions are designed so that no acute angle between adjacent chamber walls arise, so that deposits of polymer granules can be avoided in these areas. Such acute angles between adjacent chamber walls are achieved by attaching additional segments (4) as shown in FIG Fig. 1 , shown bypassed.
  • the risk of such cross-contamination is also prevented in a preferred embodiment by rinsing, for example with water, preferably with deionized water, after completion of the emptying of the mixing silo.
  • water preferably with deionized water
  • other liquids can be used, singly or as a mixture.
  • the mixed silo according to the invention is made of materials which have a sufficiently smooth surface and do not permit contamination of the polymer granules to be treated with foreign substances, such as, for example, abrasion. Suitable materials for this are, for example, plastic, aluminum alloys or steel, aluminum alloys and steel are preferably used, and the steel grades 1.4301, 1.4541 and 1.4571 are particularly preferred.
  • the emptying openings of the individual silo chambers, which open into the cone of the silo, can not be shut off.
  • the mixing space (1) below the silo chambers up to the shut-off valve (3) has a volume of not more than 2%, preferably not more than 1%, more preferably not more than 0.5% and not less than 0.1%, preferably at least 0, 2% of the total volume of the mixed silo.
  • the total volume of the mixing silo in this context is the addition of the volume of all chambers (7) and the volume of the mixing chamber (1).
  • the homogenization of optionally inhomogeneous quantities of polymer granules, for example, from a continuously operating granulate production process is carried out by filling the silo chambers with the granules and then discharging the granules. This is done in the way; in that the granulate stream (5) entering the silo is introduced in defined amounts via a movable granulate feed device, such as a rotary tube distributor (6), into individual chambers (7) of the mixing silo (8).
  • a movable granulate feed device such as a rotary tube distributor (6)
  • Filling cycle means the time interval between the start and end of the granule filling a chamber before switching to the next chamber.
  • the number of chambers to be filled depends on the size of the polymer granulate batch to be homogenized and the size of the mixing silo. It must be filled at least 2 chambers with vorzug mecanicr same amount of granules (volume or mass) to ensure approximately equal granular effluent at the lower ends of the chambers in the mixing space of the silo.
  • mixing silo preferably more than 2 mixing chambers of the mixing silo are filled, in particular 6 chambers of equal size are filled, each with almost the same high level, if this allows the size ratio of mixed silo to polymer granulate batch.
  • opposite silo chambers are preferably filled.
  • the silos are filled in the following manner:
  • the silos stand on 4 load cells each, which are used in weighing modules as support frames. This is a continuous weight measurement of the silos is given. With the weight data, the product feed amounts can be controlled, i. the pneumatic conveyors are switched on or off and the rotary distributor is brought into the appropriate filling position.
  • a granular distributor which can distribute the preferably centrally introduced on the silo roof granulate specifically targeted to individual silo chambers in any way.
  • a granular distributor tube is suitable, as in Fig. 2 is shown and which is hereinafter called "rotary tube distributor”.
  • This rotary tube distributor is mounted centrally on the roof of the silo (9) and consists of a rotatable tube (10) of suitable length and suitable curvature, which can reach each silo chamber with the outlet device.
  • the tube is preferably rotatably mounted in a holder (11) on the imaginary longitudinal axis of the cylindrical silo in the roof center and can be rotated to change or adjustment of the filling position, for example by a motor; this in turn can be controlled by suitable operating devices.
  • the filling positions can be signaled by appropriate initiators on the silo chambers.
  • the rotary tube is tightly connected via a suitable flange to the granulate feed line (12) on the roof (13) of the silo.
  • the diameter of the rotary tube largely corresponds to that of the granule feed line.
  • the entire construction, in particular in the area of the flange connection of the rotary tube, is free of undercuts or gaps in which residual quantities of granules could remain.
  • Suitable materials for the production of the rotary tube are steel or aluminum alloys, preferred materials are steel, in particular stainless steel (1.4301, 1.4541, 1.4571).
  • the control of the various positions of the chambers in the mixing silo through the rotary distributor is preferably carried out by means known from the prior art initiators, which are arranged for each chamber in the rotary tube housing. As soon as the rotary tube reaches the initiator of the chamber to be approached with a switching flag after starting, the drive is switched off.
  • the filling is preferably carried out in a 6-chamber mixing silo in the order chamber -1, -4, -2, -5, -3 and -6 (opposite chambers).
  • the granule mixing process is a purely gravimetric process, dispensing with additional granule-conveying processes, e.g. Pumping in circuits or mixing by pressure impulse turbulence. As a result, the additional formation of granular abrasion is largely avoided.
  • the mixed silo according to the invention contains, as further constituent, one or more devices for rinsing all areas of the silo interior with water or another liquid, for removal of product residues still remaining from the silo, as in FIG Fig. 3 shown.
  • This device is preferably installed on the silo roof (13) and designed so that all chambers of the silo, the rotary tube distributor and the interior of the silo roof can be sprayed with water with it.
  • This flushing device is preferably a spherical spray head (14a) with a plurality of water nozzles, so that parts of the plant can be flushed with water in an environment of nearly 360 °.
  • the draining water leaves the mixing silo through the shut-off valve (3) at the bottom of the mixing chamber (1) of the silo.
  • the spray head can be rigid or rotatable and can sit on a fixed lance which projects into the space to be flushed.
  • An alternative embodiment shows the Fig. 4 , Here, the spray ball (14b) is driven into the interior with a driven telescopic lance for the rinsing process. After the flushing process, the spray ball moves back and is sealed off, for example via a rotary flap (14c) to the interior, so that the spray ball is protected against product dusts, which may clog the water nozzles, if necessary.
  • the spray heads are rinsed in a preferred embodiment after the rinsing process with compressed air and dried. On the compressed air flushing can in the embodiment according to Fig. 4 (14b) are waived.
  • the spray heads are preferably made of stainless steel, 1.4404, but may also consist of other metal alloys.
  • the rinsing process is an automated process with preferably 2 rinse sections.
  • the conveying switch is adjusted so that the inlet is blocked in the direction of the silo.
  • the delivery line is flushed in the direction of the silo inlet.
  • the silo is rinsed.
  • the spray balls above the individual chambers and the spray balls in the region of the silo roof (Rotary tube manifold, manhole) acted upon with water. After completion of the flushing is blown with compressed air through the spray balls and dried.
  • Both rinsing processes are preferably monitored by a flow measurement.
  • the water flow rate must exceed a minimum limit.
  • the silo interiors can be dried by air.
  • a so-called dripping time can preferably be provided for drying, in which the shut-off valve (3) remains open, so that residual moisture can run off.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
EP12158560.8A 2011-03-11 2012-03-08 Mischsilo Active EP2497565B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL12158560T PL2497565T3 (pl) 2011-03-11 2012-03-08 Silos mieszający
EP12158560.8A EP2497565B1 (de) 2011-03-11 2012-03-08 Mischsilo

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11157931 2011-03-11
EP11190632 2011-11-24
EP12158560.8A EP2497565B1 (de) 2011-03-11 2012-03-08 Mischsilo

Publications (2)

Publication Number Publication Date
EP2497565A1 EP2497565A1 (de) 2012-09-12
EP2497565B1 true EP2497565B1 (de) 2015-08-12

Family

ID=45771743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12158560.8A Active EP2497565B1 (de) 2011-03-11 2012-03-08 Mischsilo

Country Status (8)

Country Link
US (1) US9028132B2 (zh)
EP (1) EP2497565B1 (zh)
CN (1) CN102671562B (zh)
ES (1) ES2549057T3 (zh)
HU (1) HUE026139T2 (zh)
IN (1) IN2012DE00676A (zh)
PL (1) PL2497565T3 (zh)
RU (1) RU2012108926A (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2505520B1 (de) * 2011-03-30 2015-01-07 Bayer Intellectual Property GmbH Fördervorrichtung für pulverförmiges und/oder granuliertes Gut
NL2011126C2 (en) * 2013-07-09 2015-01-12 J & D Beheer B V Blender for particulate materials.
CN106239733A (zh) * 2016-09-20 2016-12-21 江西和美陶瓷有限公司 陶瓷坯体粉料均化生产线、均化设备及其均化方法
USD882186S1 (en) * 2018-12-18 2020-04-21 Zaxe Technologies Inc. Automatic animal feeder
WO2023099379A1 (en) * 2021-11-30 2023-06-08 Tetra Laval Holdings & Finance S.A. Powder intake unit

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Also Published As

Publication number Publication date
IN2012DE00676A (zh) 2015-08-21
EP2497565A1 (de) 2012-09-12
US9028132B2 (en) 2015-05-12
RU2012108926A (ru) 2013-09-20
CN102671562B (zh) 2016-07-20
US20120230146A1 (en) 2012-09-13
PL2497565T3 (pl) 2016-01-29
HUE026139T2 (en) 2016-05-30
CN102671562A (zh) 2012-09-19
ES2549057T3 (es) 2015-10-22

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