EP1827665B1 - Device for adding a powdery or granulated liquid-soluble polymer flocculation aid to a liquid - Google Patents

Device for adding a powdery or granulated liquid-soluble polymer flocculation aid to a liquid Download PDF

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Publication number
EP1827665B1
EP1827665B1 EP05801882A EP05801882A EP1827665B1 EP 1827665 B1 EP1827665 B1 EP 1827665B1 EP 05801882 A EP05801882 A EP 05801882A EP 05801882 A EP05801882 A EP 05801882A EP 1827665 B1 EP1827665 B1 EP 1827665B1
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EP
European Patent Office
Prior art keywords
liquid
wheel
compartmentalised
metering element
flocculation aid
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.)
Not-in-force
Application number
EP05801882A
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German (de)
French (fr)
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EP1827665A1 (en
Inventor
Hans Damm
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.)
Reichmann Schurr Margot
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Reichmann-Schurr Margot
Reichmann Schurr Margot
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Publication of EP1827665A1 publication Critical patent/EP1827665A1/en
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Publication of EP1827665B1 publication Critical patent/EP1827665B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00Dissolving
    • B01F21/15Dissolving comprising constructions for blocking or redispersing undissolved solids, e.g. sieves, separators or guiding constructions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00Dissolving
    • B01F21/10Dissolving using driven stirrers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/45Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/451Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by means for moving the materials to be mixed or the mixture
    • B01F25/4511Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by means for moving the materials to be mixed or the mixture with a rotor surrounded by a stator provided with orifices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/45Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4523Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through sieves, screens or meshes which obstruct the whole diameter of the tube
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/707Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms the paddles co-operating, e.g. intermeshing, with elements on the receptacle wall
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20Measuring; Control or regulation
    • B01F35/21Measuring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20Measuring; Control or regulation
    • B01F35/21Measuring
    • B01F35/211Measuring of the operational parameters
    • B01F35/2111Flow rate
    • B01F35/21112Volumetric flow rate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20Measuring; Control or regulation
    • B01F35/21Measuring
    • B01F35/211Measuring of the operational parameters
    • B01F35/2117Weight
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/711Feed mechanisms for feeding a mixture of components, i.e. solids in liquid, solids in a gas stream
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71745Feed mechanisms characterised by the means for feeding the components to the mixer using pneumatic pressure, overpressure, gas or air pressure in a closed receptacle or circuit system
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80Forming a predetermined ratio of the substances to be mixed
    • B01F35/83Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/831Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80Forming a predetermined ratio of the substances to be mixed
    • B01F35/83Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/832Flow control by weighing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/305Treatment of water, waste water or sewage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50Movable or transportable mixing devices or plants
    • B01F33/501Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use

Definitions

  • the invention relates to a device for the metered addition of a powdery or granular liquid-soluble flocculation aid in a liquid according to the preamble of the main claim.
  • flocculant-containing liquid preferably water
  • flocculants are in particular synthetic polymers based on acrylamide, acrylic acid and methacrylic acid and their esters. Rarely, however, natural polymers such as starch, guar or Moringa seeds are used. These polymers act as flocculants in combination with inorganic precipitants. The solids attach themselves to this flocculant and can then be precipitated more easily.
  • Such flocculation aids are offered as granules in which a polymer gel formed in an aqueous monomer solution after the polymerization is comminuted, dried, ground and classified, or else as a bead polymer which is formed by an inverse suspension polymerization.
  • an aqueous monomer solution is dispersed and polymerized in a non-miscible solvent (e.g., cyclohexane). The polymer is then separated as a finished bead from the solvent.
  • a non-miscible solvent e.g., cyclohexane
  • aqueous monomer solution is emulsified in an immiscible carrier, for example isoparaffin, and polymerized.
  • the carrier and the emulsifiers remain in the product.
  • the latter causes in particular disadvantages in the cost structure of these products.
  • the carrier means are relatively expensive and, on the other hand, the carriers remaining in the product are negatively impacted on the transport costs due to their volumes and their weight.
  • such flocculation aids by means of a screw conveyor or the like. from above to give up a liquid and then dissolve the flocculants again by means of a stirrer.
  • This stirrer can either be permanently mounted in the tank or used as an external agitator to dissolve the flocculant in the tank.
  • Object of the present invention is therefore to provide a device with which a more effective dosing of dry-traded flocculants is possible, in which a more precise dosage is to be achieved and with which the handling should be facilitated.
  • the invention is based on the finding that the powdery or granular flocculation aid can be dissolved more easily in the liquid when the particles are wetted individually with liquid. This is achieved by injecting the flocculation aid with compressed air into the liquid. This prevents the flocculant in the liquid from clumping and then dissolving completely.
  • the compressed air line opens into a conduit which is flowed through as in the objects of the above-mentioned publications of the liquid in the the flocculant is to be mixed. As a result, a particularly accurate dosage can be achieved.
  • such a device for the metered admixture of a powdery or granular liquid-soluble flocculation aid into a liquid has a container for receiving the admixing flocculant, which is connected to the liquid-flowed conduit with the interposition of a controllable metering element.
  • the liquid-flow line is associated with a flow measuring device.
  • a weighing device which determines the weight of the flocculation aid dispensed by the metering element, this weighing device, as well as the aforesaid flow measuring device, delivering signals to a controller acting on the metering element in response to these signals this is functionally connected.
  • the proposed metering device preferably has a controllably rotatably drivable cell wheel.
  • This cellular wheel which resembles a gear in its appearance, makes it possible to dose the flocculants very precisely.
  • the cell wheel is arranged in the metering device in a chamber which surrounds the cellular wheel at its flat sides and at its periphery with walls.
  • a feed opening is provided in the cell wheel surrounding the circumference of its wall, which is connected to the container for receiving the admixing flocculant zuzumischenden.
  • This feed opening is formed shorter than this in the axial direction of the cellular wheel and thereby arranged approximately symmetrically to a median plane of the vertically arranged cellular wheel above this.
  • the flocculation aid conveyed through the feed opening to the cellular wheel is essentially placed centrally on the cellular wheel and thus does not lead to undesired frictional effects on the end faces of the cellular wheel.
  • the wall surrounding the cell wheel at its circumference is provided in the direction of rotation of the cell wheel downstream of the feed opening with a bulge widening in the radial direction. This leads in a certain way A way to loosen the flocculant so that it is easier to promote and dose.
  • the metering device is flowed through in the region of the bulge of the compressed air to which the flocculant is added.
  • the compressed air thus added with flocculant is then injected into a liquid as described above, wherein according to the invention, this liquid, (compressed) air and flocculants containing mixture to be supplied to a mixing chamber in which then the admixed flocculant is dissolved in the liquid.
  • a rotor-stator arrangement is provided in this mixing chamber, in which the stator has a multiplicity of perforated disks arranged parallel to one another and to be flowed through by the liquid in the axial direction. Between such perforated disks, a helical or propeller-shaped section of the rotor is then arranged, which ensures the continuous conveyance of the liquid-flocculant mixture.
  • an air separator is still provided, through which the air with which the flocculant is introduced into the liquid is deposited.
  • FIG. 1 shows the structure of a device according to the invention in a compact, movable embodiment.
  • the device according to the invention On a base platform 1, which is provided with a plurality of wheels 2, the device according to the invention is mounted and also in a separate cabinet 3, the control provided for this purpose.
  • the device according to the invention is supplied via a pipe extension 4 or a corresponding funnel, a liquid-soluble flocculation aid, which is received in a container 5.
  • this flocculant which is powdery or granular and which is in particular a polymer, then taken down via a metering element 6 and mixed with a liquid.
  • This flocculant added liquid is passed through a rotor-stator device 7 in which the flocculant is dissolved in the liquid.
  • the liquid with the dissolved flocculant is then discharged through a nozzle 8 and a line, not shown, from the device and added in a sewage treatment plant with up to about 5% solids added sludge water.
  • the dissolved flocculants associate with these solids, resulting in their precipitation.
  • the container 5 is in the FIG. 2 shown in section.
  • a cylindrical wall 9 which is closed at its upper end by a cover 10.
  • a chute 11 is integrated, through which the powdery or granular liquid-soluble flocculation aid can reach the interior 12 of the container 5.
  • the chute 11 is closed at its lower end by a pivot cover 13 which is actuated via a Kipphebelmechanik 14 by a pneumatic cylinder 15.
  • the lid 10 In the interior 12 of the container 5 is the lid 10 with the chute 11 against a funnel-shaped bottom 16, which ends in a central outlet opening 17.
  • a compressed air valve 18 is provided, whose function will be explained below.
  • the Indian FIG. 2 shown container 5 is mounted on a weighing platform, as shown in the FIG. 3 is shown by way of example.
  • the bottom 19 of the container 5 sits on a support plate 20 which has an opening 21 in the middle, over which the failure opening 17 comes to rest.
  • the support plate 20 is supported by stand 22 spaced from a weighing plate 23 which rests on a balance base 24.
  • the weighing plate 23 is guided by guide brackets 25.
  • the path of the weighing pan 23 is received by a weighing element 26 and transmitted to the controller in the control cabinet 3.
  • a metering element 6 is arranged, which in the FIG. 4 shown in more detail in partial exploded view.
  • a substantially horizontally arranged shaft 28 is driven via a controllable via the controller 3 motor 27, on which a vertically driven cellular wheel 29 sits rotationally.
  • This cellular wheel 29 has over its circumference a plurality of axially parallel extending cells 30 which are open to the end faces 31 of the cellular wheel 29. In this case, the cells form teeth between each other, which end in lines 32 on the cellular wheel outer circumference.
  • the bucket 29 rotates in a chamber 33, which is designed in the present example as a replaceable element and in the FIGS. 5 and 6 shown in more detail.
  • This chamber 33 is closed by a cover 34, which has a connection 35 through which compressed air can emerge from the chamber 33, which, as described below, flows through the chamber 33 parallel to the axis of the cell wheel 29.
  • the chamber 33 is, as I said, in the FIGS. 5 and 6 shown in more detail.
  • the cell wheel will rotate in one direction of rotation in a clockwise direction.
  • a feed opening 37 is introduced into the wall 36, which essentially passes through the wall 36 in a vertical direction and ends in the interior of the chamber 33.
  • the axial extent 38 of this feed opening 37 is, as in the FIG. 6 can be seen, shorter than the distance 39 between the side walls 40 of the chamber 33, which are parallel to the end faces 31 of the cellular wheel 29. This causes matter falling through the supply port 37 to not fall between the side walls 40 of the chamber 33 and the End faces 31 of the cellular wheel 29 sets, which would lead to a blockage or deceleration of the rotating cellular wheel.
  • the wall 36 of the chamber 33 surrounding the cell wheel at the circumference of the chamber 33 of the feed opening 37 has a bulge 41 extending in the radial direction downstream in the direction of rotation of the cell wheel. This bulge results in gravity falling out of the cells 30 of the cell wheel 29 and can not clamp between the lines 32 on the circumference of the cell wheel 29 and the wall 36.
  • the enriched with the flocculant auxiliary compressed air is injected through an injector 43 in a liquid flowing through a conduit 44 (in the FIG. 7 to the right).
  • the angle of inclination between the injector 43 and the liquid-flowed line 44 is preferably on the order of 45 ° or smaller in order to achieve a good mixing.
  • the powdery or granular flocculation aid is introduced into the conduit 44 so that each individual particle is individually surrounded by liquid and moistened therewith. Clumping of the flocculant is effectively prevented in this way.
  • the liquid flocculation aid-air mixture is fed to the mixing device 7, which contains a rotor-stator device and in the FIG. 8 is shown.
  • FIG. 8 illustrated rotor-stator device is traversed by a right there in the tangential direction of the inflow opening 44 substantially in the axial direction to an outlet opening lying in the axial direction 46 at the axially opposite end.
  • the liquid flowing through the rotor-stator device alternately passes through fixed perforated disks 47 and through spaces in which it is conveyed by propellers or screw sections 48 in the axial direction.
  • the propeller or screw sections sit on a common drive shaft 49 by a in the FIG. 1 shown motor 50 is set in rotation.
  • the individual perforated disks 47 one of which in the FIG. 9 is shown, in its radially central region on a plurality of axially parallel aligned holes. These holes become increasingly narrower in subsequent perforated discs, so that in this way a resolution of flocculants in the fluid flowing through is achieved.
  • the container 5 is filled after opening the pivot cover 13 through the chute 11 with a predetermined amount of powdered or granular flocculant. Thereafter, the pivot cover 13 is closed again via the pneumatic cylinder 15 and in the interior 12 of the container 5, a pressure of about 5 bar is built up via the compressed air valve 18.
  • the present in the container 5 flocculant now trickles through the opening 17 through the opening 21 in the support plate 20 through into the opening 37 of the mixing chamber 33 and falls there on the feeder 29. This rotates and doses the flocculant, which discharged by the compressed air which is passed through the port 42 and the port 35 through the chamber 33 in the axial direction.
  • the mixture exiting the chamber 33 thus consists of flocculants and air.
  • the compressed air has about a pressure of 5 bar, as it is also applied in the container 5. Within the mixing chamber 33 so no pressure differences must be overcome.
  • This enriched with flocculant auxiliary air is then as described to the device according to FIG. 7 passed and injected there into the liquid flowing through the conduit 44.
  • This inflowing liquid is detected in the amount before injecting the compressed air / flocculant auxiliary mixture by a (not shown) flow meter and this amount is reported to the controller, which is present in the control box 3.
  • the amount of flocculation aid admixed by the metering element 6 of the liquid flowing through is detected by the weight loss which the filled container 5 experiences over time and which is detected by the weighing element 26 in the carriage base 24. - It can be assumed that the weight of the elements detected by the weighing element 26 remains constant except for the flocculation aid present in the interior 12 of the container 5.
  • the controller 3 determines, in particular, the speed of the motor 27 so as to effect a proportional decrease of the flocculation aid, so that it can be assumed that the liquid which reaches the mixing device 7 always is added with a predetermined amount of flocculants.
  • This flocculant added liquid is then added as described above in a sewage treatment plant with sludge water added to solids for further purification.
  • the advantage of the device described here lies in particular in the possibility of a quasi-continuous production of fluid mixed with flocculants and in their particular operational safety.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

The invention relates to a device for adding a powdery or granulated flocculation aid to a liquid. The device includes a container for receiving the flocculation aid to be added, the flocculation aid being mixed with a liquid by a controllable dosing element. The device is provided with scales for determining the weight of the flocculation aid to be supplied by the dosing element, and the quantity of flocculation aid is adapted to the quantity of liquid flowing through by a control system. A rotor-stator arrangement has a plurality of perforated disks arranged downstream from each other in the axial direction, used for the final reliable dissolution of the flocculation aid in the liquid.

Description

Die Erfindung betrifft eine Vorrichtung zur dosierten Zumischung eines pulver- oder granulatförmigen flüssigkeitslöslichen Flockungshilfsmittels in eine Flüssigkeit gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a device for the metered addition of a powdery or granular liquid-soluble flocculation aid in a liquid according to the preamble of the main claim.

In der Klärwerkstechnik wird Schlammwasser, das noch bis ca. 5 % Feststoffe enthält, mit einer gelöste Flockungshilfsmittel enthaltenden Flüssigkeit (vorzugsweise Wasser) versetzt. Bei diesen Flockungshilfsmitteln handelt es sich insbesondere um synthetische Polymere auf der Basis von Acrylamid, Acrylsäure und Methacrylsäure sowie deren Ester. Selten werden aber auch natürliche Polymere wie Stärke, Guar oder Moringa-Samen verwendet. Diese Polymere wirken in Kombination mit anorganischen Fällungsmitteln als Flockungshilfsmittel. An diesen Flockungshilfsmittel setzen sich die Feststoffe an und können danach leichter ausgefällt werden.In sewage treatment sludge water, which still contains up to about 5% solids, is mixed with a dissolved flocculant-containing liquid (preferably water). These flocculants are in particular synthetic polymers based on acrylamide, acrylic acid and methacrylic acid and their esters. Rarely, however, natural polymers such as starch, guar or Moringa seeds are used. These polymers act as flocculants in combination with inorganic precipitants. The solids attach themselves to this flocculant and can then be precipitated more easily.

Derartige Flockungshilfsmittel werden als Granulat angeboten, bei denen ein nach der Polymerisation in einer wässrigen Monomerlösung entstandenes Polymergel zerkleinert, getrocknet, gemahlen und klassiert wird, oder aber auch als Perlpolymerisat, das entsteht durch eine inverse Suspensions-polymerisation. Bei dieser wird eine wässrige Monomerlösung in einem nicht mischbaren Lösungsmittel (z.B. Cyclohexan) verteilt und polymerisiert. Das Polymer wird dann als fertige Perle von dem Lösungsmittel abgetrennt.Such flocculation aids are offered as granules in which a polymer gel formed in an aqueous monomer solution after the polymerization is comminuted, dried, ground and classified, or else as a bead polymer which is formed by an inverse suspension polymerization. In this, an aqueous monomer solution is dispersed and polymerized in a non-miscible solvent (e.g., cyclohexane). The polymer is then separated as a finished bead from the solvent.

Es ist auch bekannt, derartige Flockungshilfsmittel als Emulsionspolymerisate in den Handel zu bringen. Für diese wird die wässrige Monomerlösung in einem nicht mischbaren Trägermittel, z.B. Isoparaffin emulgiert und polymerisiert. Das Trägermittel und die Emulgatoren verbleiben im Produkt. Letzteres bewirkt insbesondere auch Nachteile bei der Kostenstruktur dieser Produkte. Zum Einen sind die Trägermittel relativ teuer und zum Anderen schlagen sich die im Produkt verbleibenden Trägermittel in negativer Weise aufgrund ihrer Volumina und ihres Gewichts auf die Transportkosten nieder.It is also known to market such flocculants as emulsion polymers. For these, the aqueous monomer solution is emulsified in an immiscible carrier, for example isoparaffin, and polymerized. The carrier and the emulsifiers remain in the product. The latter causes in particular disadvantages in the cost structure of these products. On the one hand, the carrier means are relatively expensive and, on the other hand, the carriers remaining in the product are negatively impacted on the transport costs due to their volumes and their weight.

Unter diesem Aspekt wird insbesondere bevorzugt, trockene, granulat- oder perl- bzw. pulverförmige Flockungshilfsmittel zu verwenden.In this aspect, it is particularly preferred to use dry, granular or pearl-shaped or powdery flocculation aids.

Zur Herstellung einer mit solchen Flockungshilfsmitteln versetzten Flüssigkeit ist es dabei bisher bekannt, die in Säcken und Gebinden gelieferten Flockungshilfsmittel manuell zu einer Flüssigkeit hinzuzugeben, die in einer vorbekannten Menge in einem Tank vorhanden ist und die Flockungshilfsmittel dann mittels eines Rührers in der Flüssigkeit aufzulösen.In order to produce a liquid added with such flocculation aids, it has heretofore been known to manually add the flocculation aids supplied in sacks and containers to a liquid which is present in a known amount in a tank and then to dissolve the flocculation aids in the liquid by means of a stirrer.

Alternativ ist es auch bekannt, derartige Flockungshilfsmittel mittels einer Förderschnecke o.ä. von oben auf eine Flüssigkeit aufzugeben und die Flockungshilfsmittel dann wiederum mittels eines Rührers aufzulösen. Dieser Rührer kann entweder in dem Tank fest montiert sein oder als externes Rührwerk zur Auflösung des Flockungshilfsmittels in den Tank eingesetzt werden.Alternatively, it is also known, such flocculation aids by means of a screw conveyor or the like. from above to give up a liquid and then dissolve the flocculants again by means of a stirrer. This stirrer can either be permanently mounted in the tank or used as an external agitator to dissolve the flocculant in the tank.

Hierbei ist problematisch, dass die auf die beschriebenen Weisen erfolgten Dosierungen relativ ungenau sind. Insbesondere ist das erstgenannte Verfahren auch wegen der manuellen Handhabung des Flockungshilfsmittels relativ umständlich. Weiterhin ist das anschließende Auflösen mit dem Rührer relativ langwierig und uneffektiv.Here it is problematic that the dosages made in the ways described are relatively inaccurate. In particular, the former method is also relatively cumbersome because of the manual handling of the flocculant. Furthermore, the subsequent dissolution with the stirrer is relatively tedious and ineffective.

Es hat sich nämlich herausgestellt, dass bei diesen Arten der Dosierung zwischen 20 % und 25 % der zugeführten Flockungshilfsmittel in der Flüssigkeit verklumpen und dann nicht mehr aufgelöst werden können.It has been found that in these types of dosing between 20% and 25% of the supplied flocculants in the liquid clump and then can not be resolved.

Dadurch werden auch grundsätzlich vorhandene Kostenvorteile der genannten trocken gehandelten Flockungshilfsmittel aufgezehrt, da diese Flockungshilfsmittel zum Ausgleich dieser schlechten Auflösung dann üblicherweise höher dosiert werden.As a result, basically existing cost advantages of said dry traded flocculants are also consumed, since these flocculants are then usually metered higher to compensate for this poor resolution.

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung anzugeben, mit der eine effektivere Dosierung von trocken gehandelten Flockungshilfsmitteln möglich ist, bei der auch eine präzisere Dosierung zu erreichen ist und mit der auch die Handhabung erleichtert werden soll.Object of the present invention is therefore to provide a device with which a more effective dosing of dry-traded flocculants is possible, in which a more precise dosage is to be achieved and with which the handling should be facilitated.

Dabei ist es aus der DE 26 27 367 und der WO 03/043723 bekannt, dass eine Vorrichtung zur dosierten Zumischung des pulver- oder granulatförmigen flüssigkeitslöslichen Flockungshilfsmittels eine Druckluftleitung aufweist, mit der das Flockungshilfsmittel zur Flüssigkeit transportiert wird.It is from the DE 26 27 367 and the WO 03/043723 It is known that a device for metered addition of the powdery or granular liquid-soluble flocculation aid has a compressed-air line with which the flocculation aid is transported to the liquid.

Der Erfindung liegt die Erkenntnis zugrunde, dass sich das pulver- bzw. granulatförmige Flockungshilfsmittel problemloser in der Flüssigkeit auflösen lässt, wenn die Partikel einzeln mit Flüssigkeit benetzt werden. Dies wird erreicht, indem das Flockungshilfsmittel mit Druckluft in die Flüssigkeit injiziert bzw. eingeblasen wird. Dadurch wird verhindert, dass sich das Flockungshilfsmittel in der Flüssigkeit verklumpt und sich dann nicht mehr vollständig auflöst.The invention is based on the finding that the powdery or granular flocculation aid can be dissolved more easily in the liquid when the particles are wetted individually with liquid. This is achieved by injecting the flocculation aid with compressed air into the liquid. This prevents the flocculant in the liquid from clumping and then dissolving completely.

Obwohl es grundsätzlich ausreichend wäre, das Flockungshilfsmittel auf die beschriebene Art und Weise in einen flüssigkeitsgefüllten Tank zu injizieren, wird es bevorzugt, dass die Druckluftleitung in eine Leitung mündet, die wie bei den Gegenständen der oben genannten Druckschriften von der Flüssigkeit durchströmt wird, in die das Flockungshilfsmittel eingemischt werden soll. Hierdurch ist eine besonders genaue Dosierung zu erreichen.Although it would be generally sufficient to inject the flocculant in the manner described in a liquid-filled tank, it is preferred that the compressed air line opens into a conduit which is flowed through as in the objects of the above-mentioned publications of the liquid in the the flocculant is to be mixed. As a result, a particularly accurate dosage can be achieved.

Bei einer erfindungsgemäß besonders bevorzugten Ausführungsform weist eine derartige Vorrichtung zur dosierten Zumischung eines pulver- oder granulatförmigen flüssigkeitslöslichen Flockungshilfsmittels in eine Flüssigkeit einen Behälter auf zur Aufnahme des zuzumischenden Flockungshilfsmittels, der unter Zwischenschaltung eines steuerbaren Dosierelementes mit der flüssigkeitsdurch-strömten Leitung verbunden ist. Dabei ist der flüssigkeitsdurchströmten Leitung eine Durchflussmessvorrichtung zugeordnet. Außerdem ist eine Wiegevorrich-tung vorhanden, die das Gewicht des durch das Dosierelement abgegebenen Flockungshilfsmittels ermittelt, wobei diese Wiegevorrichtung als auch die zuvor genannte Durchflussmessvorrichtung Signale liefernd mit einer Steuerung verbunden sind, die in Abhängigkeit von diesen Signalen auf das Dosierelement einwirkt, mit dem sie hierzu funktionell verbunden ist.In a particularly preferred embodiment according to the invention, such a device for the metered admixture of a powdery or granular liquid-soluble flocculation aid into a liquid has a container for receiving the admixing flocculant, which is connected to the liquid-flowed conduit with the interposition of a controllable metering element. In this case, the liquid-flow line is associated with a flow measuring device. In addition, there is a weighing device which determines the weight of the flocculation aid dispensed by the metering element, this weighing device, as well as the aforesaid flow measuring device, delivering signals to a controller acting on the metering element in response to these signals this is functionally connected.

Die Weiterbildung hat den Vorteil, dass mit ihr eine besonders betriebssichere und genaue Dosierung und Zumischung eines Flockungshilfsmittels mit maschinellen Mitteln erreicht werden kann, wobei insbesondere aufgrund des Vorsehens der Wiegevorrichtung hier auch die geforderte Präzision gewährleistet wird, da durch diese bei dem Flockungshilfsmittel eventuell vorhandene Dichteunterschiede kompensiert werden können.The development has the advantage that with her a particularly reliable and accurate dosing and admixture of a flocculant with mechanical means can be achieved, in particular, due to the provision of the weighing device here also ensures the required precision is because this can be compensated for by the flocculation aid possibly existing density differences.

Es hat sich dabei als vorteilhaft erwiesen, die Wiegevorrichtung mit dem Behälter zu koppeln, der das zuzumischende Flockungshilfsmittel enthält, so dass sie dann Signale liefert in Abhängigkeit von der Gewichtsabnahme dieses Behälters. Durch diese Konstellation wird eine Lösung erreicht, die mit konstruktiv bewährten Mitteln zu realisieren ist.It has proven to be advantageous in this case to couple the weighing device to the container which contains the flocculation aid to be admixed, so that it then delivers signals as a function of the weight loss of this container. By this constellation, a solution is achieved, which can be realized with structurally proven means.

Die vorgesehene Dosiervorrichtung weist vorzugsweise ein steuerbar rotierend antreibbares Zellenrad auf. Dieses Zellenrad, das in seinem Erscheinungsbild einem Zahnrad ähnelt, ermöglicht es, das Flockungshilfsmittel sehr präzise zu dosieren.The proposed metering device preferably has a controllably rotatably drivable cell wheel. This cellular wheel, which resembles a gear in its appearance, makes it possible to dose the flocculants very precisely.

Es hat sich dabei als vorteilhaft erwiesen, das Zellenrad an seinem Umfang mit im Wesentlichen in Linien endenden Zähnen zu versehen. Hierdurch tritt zwischen dem Zellenrad und der es eng umgebenden Wandung einer Kammer der Dosiervorrichtung nur eine geringstmögliche Friktion auf.It has proven to be advantageous to provide the cellular wheel at its periphery with teeth ending substantially in lines. As a result, only the lowest possible friction occurs between the cellular wheel and the wall of a chamber of the metering device which closely surrounds it.

Wie erwähnt ist das Zellenrad in der Dosiervorrichtung in einer Kammer angeordnet, die das Zellenrad an seinen Flachseiten und an seinem Umfang mit Wänden umgibt. Dabei ist in der das Zellenrad an dessen Umfang umgebenden Wand eine Zuführöffnung vorgesehen, die mit dem Behälter zur Aufnahme des zuzumischenden Flockungshilfsmittels verbunden ist. Diese Zuführöffnung ist in Axialrichtung des Zellenrades kürzer als dieses ausgebildet und dabei in etwa symmetrisch zu einer Mittelebene des vertikal angeordneten Zellenrades oberhalb dieses angeordnet. Auf diese Weise wird das durch die Zuführöffnung zum Zellenrad geförderte Flockungshilfsmittel im Wesentlichen mittig auf das Zellenrad aufgegeben und führt somit an den Stirnseiten des Zellenrades nicht zu unerwünschten Reibeffekten.As mentioned, the cell wheel is arranged in the metering device in a chamber which surrounds the cellular wheel at its flat sides and at its periphery with walls. In this case, a feed opening is provided in the cell wheel surrounding the circumference of its wall, which is connected to the container for receiving the admixing flocculant zuzumischenden. This feed opening is formed shorter than this in the axial direction of the cellular wheel and thereby arranged approximately symmetrically to a median plane of the vertically arranged cellular wheel above this. In this way, the flocculation aid conveyed through the feed opening to the cellular wheel is essentially placed centrally on the cellular wheel and thus does not lead to undesired frictional effects on the end faces of the cellular wheel.

Vorteilhafterweise ist die das Zellenrad an dessen Umfang umgebende Wand in Rotationsrichtung des Zellenrades der Zuführöffnung nachgeordnet mit einer sich in Radialrichtung erweiternden Ausbuchtung versehen. Dies führt in gewisser Weise zu einer Auflockerung des Flockungshilfsmittels, so dass es leichter zu fördern und zu dosieren ist.Advantageously, the wall surrounding the cell wheel at its circumference is provided in the direction of rotation of the cell wheel downstream of the feed opening with a bulge widening in the radial direction. This leads in a certain way A way to loosen the flocculant so that it is easier to promote and dose.

Dabei ist vorgesehen, dass die Dosiervorrichtung im Bereich der Ausbuchtung von der Druckluft durchströmt wird, der das Flockungshilfsmittel zugesetzt wird. Die derart mit Flockungshilfsmittel versetzte Druckluft wird dann wie oben beschrieben in eine Flüssigkeit injiziert, wobei erfindungsgemäß ist, dieses Flüssigkeit, (Druck-)Luft und Flockungshilfsmittel enthaltende Gemisch einer Mischkammer zuzuführen, in der dann das zugemischte Flockungshilfsmittel in der Flüssigkeit gelöst wird.It is provided that the metering device is flowed through in the region of the bulge of the compressed air to which the flocculant is added. The compressed air thus added with flocculant is then injected into a liquid as described above, wherein according to the invention, this liquid, (compressed) air and flocculants containing mixture to be supplied to a mixing chamber in which then the admixed flocculant is dissolved in the liquid.

Bei einer erfindungsgemäßen Ausführungsform ist in dieser Mischkammer eine Rotor-Stator-Anordnung vorgesehen, bei der der Stator eine Vielzahl von parallel zueinander angeordneten, in Axialrichtung von der Flüssigkeit zu durchströmende Lochscheiben aufweist. Zwischen derartigen Lochscheiben ist dann ein schneckengang- oder propellerförmiger Abschnitt des Rotors angeordnet, der für die kontinuierliche Förderung des Flüssigkeit-Flockungshilfsmittel-Gemisches Sorge trägt.In an embodiment according to the invention, a rotor-stator arrangement is provided in this mixing chamber, in which the stator has a multiplicity of perforated disks arranged parallel to one another and to be flowed through by the liquid in the axial direction. Between such perforated disks, a helical or propeller-shaped section of the rotor is then arranged, which ensures the continuous conveyance of the liquid-flocculant mixture.

Bei dieser Konstellation hat es sich als sehr wirksam erwiesen, den Durchmesser der Löcher von in Strömungsrichtung einander nachfolgenden Lochscheiben kleiner werdend auszuführen. Dies bewirkt eine besonders schnelle und wirksame Auflösung des Flockungshilfsmittels in der Flüssigkeit.In this constellation, it has proven to be very effective to make the diameter of the holes smaller in the flow direction of successive perforated discs smaller. This causes a particularly fast and effective dissolution of the flocculant in the liquid.

Es sei hier noch erwähnt, dass bei der wie hier beschriebenen Vorrichtung noch ein Luftabscheider vorgesehen ist, durch den die Luft, mit dem das Flockungshilfsmittel in die Flüssigkeit eingebracht wird, abgeschieden wird.It should be mentioned here that in the device as described here, an air separator is still provided, through which the air with which the flocculant is introduced into the liquid is deposited.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels. Dabei zeigt

Figur 1
eine erfindungsgemäße Vorrichtung in perspektivischer Gesamtdarstellung;
Figur 2
einen Schnitt durch einen Behälter zur Aufnahme des zuzumischenden Flockungshilfsmittels;
Figur 3
eine perspektivische Explosionsdarstellung einer in der Vorrichtung vorhandenen Wiegevorrichtung;
Figur 4
eine perspektivische Darstellung einer teilweise demontierten Dosiervorrichtung;
Figur 5
ein Teil der erfindungsgemäßen Dosiervorrichtung in perspektivi- scher Ansicht;
Figur 6
das Teil gemäß Figur 5 in einer Schnittansicht;
Figur 7
Schnitt durch ein Bauteil der Vorrichtung zur Injektion von Flockungshilfsmittel in eine Flüssigkeit;
Figur 8
einen Schnitt durch eine Rotor-Stator-Vorrichtung der erfindungsge- mäßen Vorrichtung;
Figur 9
eine perspektivische Ansicht einer Lochscheibe aus der Rotor- Stator-Vorrichtung gemäß Figur 8.
Further advantages and features of the invention will become apparent from the following description of an embodiment. It shows
FIG. 1
an apparatus according to the invention in an overall perspective view;
FIG. 2
a section through a container for receiving the zukumischenden flocculant aid;
FIG. 3
an exploded perspective view of a present in the device weighing device;
FIG. 4
a perspective view of a partially dismantled metering device;
FIG. 5
a part of the metering device according to the invention in a perspective view;
FIG. 6
the part according to FIG. 5 in a sectional view;
FIG. 7
Section through a component of the device for injecting flocculant in a liquid;
FIG. 8
a section through a rotor-stator device of the inventive device;
FIG. 9
a perspective view of a perforated disc from the rotor-stator device according to FIG. 8 ,

Figur 1 zeigt den Aufbau einer erfindungsgemäßen Vorrichtung in einer kompakten, verfahrbaren Ausführungsform. FIG. 1 shows the structure of a device according to the invention in a compact, movable embodiment.

Auf einer Grundplattform 1, die mit mehreren Rädern 2 versehen ist, ist die erfindungsgemäße Vorrichtung montiert und auch in einem separaten Schaltschrank 3 die für diese vorgesehene Steuerung.On a base platform 1, which is provided with a plurality of wheels 2, the device according to the invention is mounted and also in a separate cabinet 3, the control provided for this purpose.

Der erfindungsgemäßen Vorrichtung wird über einen Rohransatz 4 oder einen entsprechenden Trichter ein flüssigkeitslösliches Flockungshilfsmittel zugeführt, das in einem Behälter 5 aufgenommen wird.The device according to the invention is supplied via a pipe extension 4 or a corresponding funnel, a liquid-soluble flocculation aid, which is received in a container 5.

Aus diesem Behälter 5 wird dieses Flockungshilfsmittel, das pulver- oder granulatförmig ist und bei dem es sich insbesondere um eine Polymer handelt, dann nach unten über ein Dosierelement 6 entnommen und einer Flüssigkeit zugemischt. Diese mit Flockungshilfsmittel versetzte Flüssigkeit wird durch eine Rotor-Stator-Vorrichtung 7 geleitet, in der das Flockungshilfsmittel in der Flüssigkeit aufgelöst wird. Die Flüssigkeit mit dem gelösten Flockungshilfsmittel wird dann über einen Stutzen 8 und eine nicht dargestellte Leitung von der Vorrichtung abgegeben und in einer Kläranlage einem mit bis zu ca. 5 % Feststoffen versetzten Schlammwasser zugesetzt. Die gelösten Flockungshilfsmittel verbinden sich mit diesen Feststoffen, was zu deren Ausfällung führt.From this container 5, this flocculant, which is powdery or granular and which is in particular a polymer, then taken down via a metering element 6 and mixed with a liquid. This flocculant added liquid is passed through a rotor-stator device 7 in which the flocculant is dissolved in the liquid. The liquid with the dissolved flocculant is then discharged through a nozzle 8 and a line, not shown, from the device and added in a sewage treatment plant with up to about 5% solids added sludge water. The dissolved flocculants associate with these solids, resulting in their precipitation.

Der Behälter 5 ist in der Figur 2 im Schnitt dargestellt. Man erkennt eine zylinderförmige Wand 9, die an ihrem oberen Ende durch einen Deckel 10 verschlossen ist. In diesen Deckel 10 ist ein Fallschacht 11 integriert, durch den das pulver- oder granulatförmige flüssigkeitslösliche Flockungshilfsmittel in das Innere 12 des Behälters 5 gelangen kann. Der Fallschacht 11 ist an seinem unteren Ende durch einen Schwenkdeckel 13 verschließbar, der über eine Kipphebelmechanik 14 von einem Pneumatikzylinder 15 betätigbar ist.The container 5 is in the FIG. 2 shown in section. One recognizes a cylindrical wall 9, which is closed at its upper end by a cover 10. In this cover 10, a chute 11 is integrated, through which the powdery or granular liquid-soluble flocculation aid can reach the interior 12 of the container 5. The chute 11 is closed at its lower end by a pivot cover 13 which is actuated via a Kipphebelmechanik 14 by a pneumatic cylinder 15.

Im Inneren 12 des Behälters 5 liegt dem Deckel 10 mit dem Fallschacht 11 gegenüber ein trichterförmiger Boden 16, der in einer zentrischen Ausfallöffnung 17 endet.In the interior 12 of the container 5 is the lid 10 with the chute 11 against a funnel-shaped bottom 16, which ends in a central outlet opening 17.

Des Weiteren ist in der Wand 9 des Behälters 5 noch ein Druckluftventil 18 vorgesehen, dessen Funktion weiter unten erläutert wird.Furthermore, in the wall 9 of the container 5 is still a compressed air valve 18 is provided, whose function will be explained below.

Der in der Figur 2 dargestellte Behälter 5 ist auf eine Wiegeplattform montiert, wie sie in der Figur 3 beispielhaft dargestellt ist. Der Boden 19 des Behälters 5 sitzt dabei auf einer Tragplatte 20, die mittig eine Öffnung 21 aufweist, über der die Ausfallöffnung 17 zu liegen kommt. Die Tragplatte 20 ist durch Ständer 22 beabstandet getragen von einem Wägeteller 23, der auf einem Waagenunterteil 24 aufsitzt. Dabei wird der Wägeteller 23 durch Führungsklammern 25 geführt. Der Weg des Wägetellers 23 wird dabei durch ein Wiegeelement 26 aufgenommen und an die Steuerung im Schaltschrank 3 übermittelt.The Indian FIG. 2 shown container 5 is mounted on a weighing platform, as shown in the FIG. 3 is shown by way of example. The bottom 19 of the container 5 sits on a support plate 20 which has an opening 21 in the middle, over which the failure opening 17 comes to rest. The support plate 20 is supported by stand 22 spaced from a weighing plate 23 which rests on a balance base 24. In this case, the weighing plate 23 is guided by guide brackets 25. The path of the weighing pan 23 is received by a weighing element 26 and transmitted to the controller in the control cabinet 3.

Auch hier wird die Funktion weiter unten näher erläutert.Again, the function is explained below.

In dem Raum, der zwischen der Tragplatte 20 und dem Wägeteller 23 durch die Ständer 22 geschaffen wird, ist ein Dosierelement 6 angeordnet, das in der Figur 4 detaillierter in teilweiser Explosionsdarstellung gezeigt ist.In the space which is created between the support plate 20 and the weighing plate 23 by the stator 22, a metering element 6 is arranged, which in the FIG. 4 shown in more detail in partial exploded view.

Bei diesem Dosierelement wird über einen über die Steuerung 3 steuerbaren Motor 27 eine im wesentlichen horizontal angeordnete Welle 28 angetrieben, auf der ein vertikal angetriebenes Zellenrad 29 verdrehfest sitzt. Dieses Zellenrad 29 hat über seinen Umfang eine Vielzahl von achsparallel verlaufenden Zellen 30, die zu den Stirnseiten 31 des Zellenrades 29 hin offen sind. Die Zellen bilden dabei zwischen einander Zähne, die am Zellenrad-Außenumfang in Linien 32 enden.In this metering element, a substantially horizontally arranged shaft 28 is driven via a controllable via the controller 3 motor 27, on which a vertically driven cellular wheel 29 sits rotationally. This cellular wheel 29 has over its circumference a plurality of axially parallel extending cells 30 which are open to the end faces 31 of the cellular wheel 29. In this case, the cells form teeth between each other, which end in lines 32 on the cellular wheel outer circumference.

Das Zellenrad 29 rotiert in einer Kammer 33, die im vorliegenden Beispiel als auswechselbares Element ausgeführt ist und in den Figuren 5 und 6 detaillierter gezeigt ist. Diese Kammer 33 ist durch einen Deckel 34 zu verschließen, der einen Anschluss 35 aufweist, durch den Druckluft aus der Kammer 33 heraustreten kann, die wie unten beschrieben die Kammer 33 achsparallel zu dem Zellenrad 29 durchströmt.The bucket 29 rotates in a chamber 33, which is designed in the present example as a replaceable element and in the FIGS. 5 and 6 shown in more detail. This chamber 33 is closed by a cover 34, which has a connection 35 through which compressed air can emerge from the chamber 33, which, as described below, flows through the chamber 33 parallel to the axis of the cell wheel 29.

Die Kammer 33 ist, wie gesagt, in den Figuren 5 und 6 detaillierter dargestellt. Man erkennt in der Figur 5 die Kammer 33 in ihrer üblichen Betriebsstellung, bei der die Achse des in ihr rotierenden Zellenrades 29 im Wesentlichen horizontal ausgerichtet ist.The chamber 33 is, as I said, in the FIGS. 5 and 6 shown in more detail. One recognizes in the FIG. 5 the chamber 33 in its usual operating position, in which the axis of the rotating in their cellular wheel 29 is oriented substantially horizontally.

Im hier dargestellten Beispiel wird das Zellenrad dabei in einer Drehrichtung rotieren mit dem Uhrzeigersinn.In the example shown here, the cell wheel will rotate in one direction of rotation in a clockwise direction.

In Rotationsrichtung kurz nach dem obersten Scheitelpunkt der Kammer ist dabei in die Wand 36 eine Zuführöffnung 37 eingebracht, die im Wesentlichen in einer Vertikalrichtung durch die Wand 36 hindurchläuft und im Inneren der Kammer 33 endet. Die axiale Erstreckung 38 dieser Zuführöffnung 37 ist, wie in der Figur 6 zu erkennen ist, kürzer als der Abstand 39 zwischen den Seitenwänden 40 der Kammer 33, die parallel zu den Stirnseiten 31 des Zellenrades 29 liegen. Hierdurch wird bewirkt, dass durch die Zuführöffnung 37 fallendes Material sich nicht zwischen die Seitenwände 40 der Kammer 33 und den Stirnseiten 31 des Zellenrades 29 festsetzt, was zu einer Blockierung oder Abbremsung des rotierenden Zellenrades führen würde.In the direction of rotation, shortly after the uppermost vertex of the chamber, a feed opening 37 is introduced into the wall 36, which essentially passes through the wall 36 in a vertical direction and ends in the interior of the chamber 33. The axial extent 38 of this feed opening 37 is, as in the FIG. 6 can be seen, shorter than the distance 39 between the side walls 40 of the chamber 33, which are parallel to the end faces 31 of the cellular wheel 29. This causes matter falling through the supply port 37 to not fall between the side walls 40 of the chamber 33 and the End faces 31 of the cellular wheel 29 sets, which would lead to a blockage or deceleration of the rotating cellular wheel.

In der Figur 5 ist weiterhin zu erkennen, dass die das Zellenrad an seinem Umfang umgebende Wand 36 der Kammer 33 der Zuführöffnung 37 in Rotationsrichtung des Zellenrades nachgeordnet eine sich in Radialrichtung erstreckende Ausbuchtung 41 aufweist. Diese Ausbuchtung führt dazu, dass aufgrund der Schwerkraft aus den Zellen 30 des Zellenrades 29 herausfallendes Gut sich nicht zwischen den am Umfang des Zellenrades 29 befindlichen Linien 32 und der Wand 36 festklemmen kann.In the FIG. 5 Furthermore, it can be seen that the wall 36 of the chamber 33 surrounding the cell wheel at the circumference of the chamber 33 of the feed opening 37 has a bulge 41 extending in the radial direction downstream in the direction of rotation of the cell wheel. This bulge results in gravity falling out of the cells 30 of the cell wheel 29 and can not clamp between the lines 32 on the circumference of the cell wheel 29 and the wall 36.

Vielmehr wird in dieser Ausbuchtung 41 durch den Anschluss 42 zugeführte Druckluft achsparallel durch die Zellen 30 des Zellenrades 29 hindurchgeleitet und durch den Anschluss 35 aus der Kammer 33 herausgeführt. Diese Druckluft nimmt dabei das dem Dosierelement zugeführte pulver- bzw. granulatförmige Flockungshilfsmittel mit und trägt es zu einem in der Figur 7 dargestellten Bauelement.Rather, in this bulge 41 supplied through the terminal 42 compressed air is passed axially parallel through the cells 30 of the cellular wheel 29 and led out through the terminal 35 from the chamber 33. This compressed air takes with the metering supplied with powder or granular flocculant and carries it to a in the FIG. 7 illustrated component.

Bei diesem Bauelement wird die mit dem Flockungshilfsmittel angereicherte Druckluft durch einen Injektor 43 in eine Flüssigkeit eingeblasen, die durch eine Leitung 44 strömt (in der Figur 7 nach rechts). Der Neigungswinkel zwischen dem Injektor 43 und der flüssigkeitsdurchströmten Leitung 44 ist dabei vorzugsweise in der Größenordnung von 45° oder kleiner, um eine gute Vermischung zu erreichen.In this device, the enriched with the flocculant auxiliary compressed air is injected through an injector 43 in a liquid flowing through a conduit 44 (in the FIG. 7 to the right). The angle of inclination between the injector 43 and the liquid-flowed line 44 is preferably on the order of 45 ° or smaller in order to achieve a good mixing.

Insbesondere wird bei dieser Injektion das pulver- bzw. granulatförmige Flockungshilfsmittel so in die Leitung 44 eingeführt, dass jedes einzelne Partikel einzeln von Flüssigkeit umgeben und damit befeuchtet wird. Ein Verklumpen des Flockungshilfsmittels ist auf diese Art und Weise wirksam unterbunden.In particular, in this injection, the powdery or granular flocculation aid is introduced into the conduit 44 so that each individual particle is individually surrounded by liquid and moistened therewith. Clumping of the flocculant is effectively prevented in this way.

Mit der Leitung 44 wird das Flüssigkeits-Flockungshilfsmittel-Luft-Gemisch zu der Mischvorrichtung 7 geführt, die eine Rotor-Stator-Vorrichtung enthält und in der Figur 8 dargestellt ist.With the conduit 44, the liquid flocculation aid-air mixture is fed to the mixing device 7, which contains a rotor-stator device and in the FIG. 8 is shown.

Die in der Figur 8 dargestellte Rotor-Stator-Vorrichtung wird von einer dort rechts in Tangentialrichtung liegenden Zuströmöffnung 44 im Wesentlichen in Axialrichtung durchströmt zu einer in Axialrichtung liegenden Auslassöffnung 46 am axial entgegenliegenden Ende.The in the FIG. 8 illustrated rotor-stator device is traversed by a right there in the tangential direction of the inflow opening 44 substantially in the axial direction to an outlet opening lying in the axial direction 46 at the axially opposite end.

Die durch die Rotor-Stator-Vorrichtung strömende Flüssigkeit tritt dabei abwechselnd durch feststehende Lochscheiben 47 und durch Räume, in denen sie durch Propeller oder Schneckenabschnitte 48 in Axialrichtung gefördert wird. Die Propeller oder Schneckenabschnitte sitzen dabei auf einer gemeinsamen Antriebswelle 49, die durch einen in der Figur 1 dargestellten Motor 50 in Rotation gesetzt wird.The liquid flowing through the rotor-stator device alternately passes through fixed perforated disks 47 and through spaces in which it is conveyed by propellers or screw sections 48 in the axial direction. The propeller or screw sections sit on a common drive shaft 49 by a in the FIG. 1 shown motor 50 is set in rotation.

Die einzelnen Lochscheiben 47, von denen eine in der Figur 9 dargestellt ist, weisen in ihrem radial mittleren Bereich eine Vielzahl von achsparallel ausgerichteten Löchern auf. Diese Löcher werden bei nachfolgenden Lochscheiben immer enger, so dass auf diese Weise eine Auflösung von Flockungshilfsmittel in der durchströmenden Flüssigkeit erreicht wird.The individual perforated disks 47, one of which in the FIG. 9 is shown, in its radially central region on a plurality of axially parallel aligned holes. These holes become increasingly narrower in subsequent perforated discs, so that in this way a resolution of flocculants in the fluid flowing through is achieved.

Die bisher beschriebene Vorrichtung wird nun wie folgt betrieben:The device described so far is now operated as follows:

Der Behälter 5 wird nach Öffnen des Schwenkdeckels 13 durch den Fallschacht 11 mit einer vorgegebenen Menge an pulver- oder granulatförmigem Flockungshilfsmittel gefüllt. Danach wird der Schwenkdeckel 13 über den Pneumatikzylinder 15 wieder geschlossen und im Inneren 12 des Behälters 5 wird über das Druckluftventil 18 ein Druck aufgebaut von etwa 5 bar.The container 5 is filled after opening the pivot cover 13 through the chute 11 with a predetermined amount of powdered or granular flocculant. Thereafter, the pivot cover 13 is closed again via the pneumatic cylinder 15 and in the interior 12 of the container 5, a pressure of about 5 bar is built up via the compressed air valve 18.

Das in dem Behälter 5 vorhandene Flockungshilfsmittel rieselt nun durch die Ausfallöffnung 17 durch die Öffnung 21 in der Tragplatte 20 hindurch in die Öffnung 37 der Mischkammer 33 und fällt dort auf das Zellenrad 29. Dieses rotiert und dosiert dabei das Flockungshilfsmittel, das durch die Druckluft ausgetragen wird, die durch den Anschluss 42 und den Anschluss 35 durch die Kammer 33 in Axialrichtung hindurchgeleitet wird. Das aus der Kammer 33 austretende Gemisch besteht somit aus Flockungshilfsmittel und Luft.The present in the container 5 flocculant now trickles through the opening 17 through the opening 21 in the support plate 20 through into the opening 37 of the mixing chamber 33 and falls there on the feeder 29. This rotates and doses the flocculant, which discharged by the compressed air which is passed through the port 42 and the port 35 through the chamber 33 in the axial direction. The mixture exiting the chamber 33 thus consists of flocculants and air.

Die Druckluft hat etwa einen Druck von 5 bar, wie er auch in dem Behälter 5 aufgebracht wird. Innerhalb der Mischkammer 33 müssen also keine Druckunterschiede überwunden werden.The compressed air has about a pressure of 5 bar, as it is also applied in the container 5. Within the mixing chamber 33 so no pressure differences must be overcome.

Diese mit Flockungshilfsmittel angereicherte Luft wird dann wie beschrieben zu dem Bauelement gemäß Figur 7 geleitet und dort in die Flüssigkeit injiziert, die durch die Leitung 44 strömt.This enriched with flocculant auxiliary air is then as described to the device according to FIG. 7 passed and injected there into the liquid flowing through the conduit 44.

Diese zuströmende Flüssigkeit wird vor dem Einblasen des Druckluft/ Flockungshilfsmittel-Gemisches durch eine (nicht dargestellte) Durchflussmessvorrichtung der Menge nach erfasst und diese Menge wird an die Steuerung gemeldet, die in dem Schaltkasten 3 vorhanden ist.This inflowing liquid is detected in the amount before injecting the compressed air / flocculant auxiliary mixture by a (not shown) flow meter and this amount is reported to the controller, which is present in the control box 3.

Die durch das Dosierelement 6 der durchströmenden Flüssigkeit zugemischte Menge an Flockungshilfsmittel wird erfasst durch den Gewichtsverlust, den der gefüllte Behälter 5 im Laufe der Zeit erfährt und der durch das Wiegeelement 26 im Wagenunterteil 24 erfasst wird. - Hierbei ist davon auszugehen, dass das Gewicht der vom Wiegeelement 26 erfassten Elemente konstant bleibt bis auf das im Inneren 12 des Behälters 5 vorhandenen Flockungshilfsmittel.The amount of flocculation aid admixed by the metering element 6 of the liquid flowing through is detected by the weight loss which the filled container 5 experiences over time and which is detected by the weighing element 26 in the carriage base 24. - It can be assumed that the weight of the elements detected by the weighing element 26 remains constant except for the flocculation aid present in the interior 12 of the container 5.

In Abhängigkeit des Gewichtsverlustes und der ermittelten Durchströmmenge bestimmt die Steuerung 3 dann insbesondere die Geschwindigkeit des Motors 27, um damit eine der Durchströmmenge proportionale Abnahme des Flockungshilfsmittels zu bewirken, so dass davon auszugehen ist, dass die Flüssigkeit, die zu der Mischvorrichtung 7 gelangt, immer mit einer vorgegebenen Menge an Flockungshilfsmitteln versetzt ist.Depending on the weight loss and the determined flow rate, the controller 3 then determines, in particular, the speed of the motor 27 so as to effect a proportional decrease of the flocculation aid, so that it can be assumed that the liquid which reaches the mixing device 7 always is added with a predetermined amount of flocculants.

Die Auflösung dieses Flockungshilfsmittels in der Flüssigkeit erfolgt dann wie beschrieben in der Rotor-Stator-Vorrichtung 7, wobei dieser parallel geschaltet auch ein Luftabscheider vorhanden ist, um die aus dem Inneren 12 des Behälters 3 stammende Luft und die zur Injektion benutzte Druckluft aus der mit Flockungshilfsmittel versetzten Flüssigkeit abzuscheiden.The dissolution of this flocculant in the liquid then takes place as described in the rotor-stator device 7, wherein this parallel connected and an air separator is provided to the originating from the interior 12 of the container 3 and the air used for the injection of compressed air from the Flocculants added to separate liquid.

Diese mit Flockungshilfsmittel versetzte Flüssigkeit wird dann wie oben beschrieben in einer Kläranlage mit Feststoffen versetztem Schlammwasser zugesetzt, zu dessen weiteren Reinigung.This flocculant added liquid is then added as described above in a sewage treatment plant with sludge water added to solids for further purification.

Es soll noch erwähnt werden, dass in der Rotor-Stator-Vorrichtung 7 es auch möglich ist, zusätzlich ein flüssig vorliegendes Flockungshilfsmittel zuzuführen. Hierbei ist zu berücksichtigen, dass pulver- bzw. granulatförmige Flockungshilfsmittel in Verbindung mit derartigen flüssigen Flockungshilfsmittel besonders günstige, da "breit gefächerte" Flockungseigenschaften aufweisen.It should also be mentioned that in the rotor-stator device 7 it is also possible to additionally supply a flocculation aid present in liquid form. It should be noted that powdery or granular flocculants in conjunction with such liquid flocculants have particularly favorable, since "diversified" flocculation.

Das Beimischen derartiger flüssig gehandelten Flockungshilfsmittel kann mit der beschriebenen Rotor-Stator-Vorrichtung sowohl erfolgen bei einem ersten Durchleiten zur Auflösung von pulver- und granulatförmigem Flockungshilfsmittel in Flüssigkeit, als auch bei einer anschließend noch einmal erfolgenden Umwälzung der bereits vorhandenen Flüssigkeit durch die Rotor-Stator-Vorrichtung 7.The admixing of such liquid traded flocculants with the rotor-stator device described can be carried out both in a first passage for the dissolution of powdery and granular flocculant in liquid, as well as in a subsequent once again circulating the existing liquid through the rotor stator Device 7.

Der Vorteil der hier beschriebenen Vorrichtung liegt insbesondere in der Möglichkeit einer quasi kontinuierlichen Herstellung von mit Flockungshilfsmitteln versetzter Flüssigkeit und in deren besonderen Betriebssicherheit.The advantage of the device described here lies in particular in the possibility of a quasi-continuous production of fluid mixed with flocculants and in their particular operational safety.

Claims (11)

  1. Apparatus for metered admixture of a powdered or granular liquid-soluble flocculating agent in a liquid, wherein this device has a compressed air pipe (43) which transports the flocculating agent to the liquid and opens into a conduit (44) through which the liquid flows, characterised in that a mixing device (7) with a rotor-stator arrangement is disposed downstream of the conduit in the flow direction thereof.
  2. Apparatus as claimed in Claim 1, characterised in that the stator of the rotor-stator arrangement has a plurality of perforated discs for a through flow in the axial direction.
  3. Apparatus as claimed in Claim 2, characterised in that the diameter of the holes of in the flow direction successive perforated discs (45) decreases.
  4. Apparatus as claimed in Claim 1, characterised in that an air separator is provided on the mixing device (7).
  5. Apparatus as claimed in Claim 1, characterised in that the compressed air pipe is connected by way of a controllable metering element (6) to a container (5) for receiving the flocculating agent to be added, and that the conduit through which the liquid flows has a flow meter, wherein a weighing device (26) is provided which determines the weight of the flocculating agent dispensed by the metering element (6) and wherein the flow meter and the weighing device (6) supply signals and are connected to a control unit (3) which acts as a function of these signals on the metering element to which it is functionally connected.
  6. Apparatus as claimed in Claim 5, characterised in that the weighing device (26) is coupled to the container (5) and supplies signals as a function of the decrease in weight thereof.
  7. Apparatus as claimed in Claim 5, characterised in that the metering element (6) has a compartmentalised wheel (29) which can be driven controllably in rotation.
  8. Apparatus as claimed in Claim 7, characterised in that the compartmentalised wheel (29) has a plurality of compartments (30) substantially ending in lines on the circumference.
  9. Apparatus as claimed in Claim 7, characterised in that the compartmentalised wheel (29) is disposed in the metering element (6) in a chamber (33) which surrounds the compartmentalised wheel (29) on its flat faces (31) and its circumference with walls (40, 36), wherein in the wall (36) surrounding the compartmentalised wheel (29) on the circumference thereof a feed opening (37) is provided which is shorter in the axial direction of the compartmentalised wheel (29).
  10. Apparatus as claimed in Claim 9, characterised in that the wall (36) surrounding the compartmentalised wheel (29) on the circumference thereof has a convexity expanded in the radial direction which is disposed downstream of the feed opening (37) in the direction of rotation of the compartmentalised wheel (29).
  11. Apparatus as claimed in Claim 10, characterised in that compressed air flows through the metering element (6) in the axial direction in the region of the convexity (41).
EP05801882A 2004-11-15 2005-11-12 Device for adding a powdery or granulated liquid-soluble polymer flocculation aid to a liquid Not-in-force EP1827665B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055072A DE102004055072A1 (en) 2004-11-15 2004-11-15 Device for admixing a polymer in a liquid
PCT/EP2005/012137 WO2006050979A1 (en) 2004-11-15 2005-11-12 Device for adding a powdery or granulated liquid-soluble polymer flocculation aid to a liquid

Publications (2)

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EP1827665A1 EP1827665A1 (en) 2007-09-05
EP1827665B1 true EP1827665B1 (en) 2009-03-25

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US (1) US20080225635A1 (en)
EP (1) EP1827665B1 (en)
AT (1) ATE426450T1 (en)
DE (2) DE102004055072A1 (en)
WO (1) WO2006050979A1 (en)

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Publication number Publication date
WO2006050979A1 (en) 2006-05-18
EP1827665A1 (en) 2007-09-05
US20080225635A1 (en) 2008-09-18
DE102004055072A1 (en) 2006-05-18
DE502005006964D1 (en) 2009-05-07
ATE426450T1 (en) 2009-04-15

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