EP3288674B1 - Système d'organe d'agitation - Google Patents

Système d'organe d'agitation Download PDF

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Publication number
EP3288674B1
EP3288674B1 EP16719396.0A EP16719396A EP3288674B1 EP 3288674 B1 EP3288674 B1 EP 3288674B1 EP 16719396 A EP16719396 A EP 16719396A EP 3288674 B1 EP3288674 B1 EP 3288674B1
Authority
EP
European Patent Office
Prior art keywords
stirring
stirring blade
blade
agitator
container
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
EP16719396.0A
Other languages
German (de)
English (en)
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EP3288674A1 (fr
Inventor
Klaus GEZORK
Werner Himmelsbach
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.)
EKATO Ruehr und Mischtechnik GmbH
Original Assignee
EKATO Ruehr und Mischtechnik GmbH
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Publication of EP3288674A1 publication Critical patent/EP3288674A1/fr
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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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/47—Mixing liquids with liquids; Emulsifying involving high-viscosity liquids, e.g. asphalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B01F27/906—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms  with fixed axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles

Definitions

  • the invention relates to a stirring device according to the preamble of claim 1.
  • the DE 295 02443 U1 shows a mixer with a mixing trough for receiving mixed material, containing at least one mixing tool arranged on a rotor and projecting into the mixing trough from above, the rotor having a clamping set and the mixing tool being connectable to the rotor by means of the clamping set.
  • the DE 103 10 091 A1 shows a device for carrying out chemical and physical processes, in which flowable substances are mixed together, consisting of a vertical cylindrical container with inlets and outlets, and a central shaft and arranged on this, extending to the wall, radial impellers, whereby the agitator blades are curved as seen in the circumferential direction, the agitator blades being combined as agitating elements in pairs one above the other to form groups and the blades of one organ of the group being radially concave and the vanes of the other organ being radially convex.
  • the DE 28 31 192 C2 shows a method for mixing a mainly liquid reaction mixture in a container by supplying mixing energy by two axial stirrers arranged in a vertical and horizontal direction to each other in an agitator container, wherein in both stirring areas by different speeds of the axial stirrer and / or different geometry of the stirring elements Both axial stirrers have the same delivery rates in opposite axial delivery directions with the opposite direction of rotation of the axial stirrers to achieve free turbulence on the connecting line between the points at which the mixing energy is supplied.
  • the DE 31 43 287 C2 1 shows an agitator for grape mash, which has a rotating shaft and leaf-shaped mixing blades which have at least one first section which is inclined at an angle to the direction of rotation, the second section being followed by a second wing section which is arranged in the same direction, seen in at least one direction of rotation, whose angle of attack is smaller than that of the first section.
  • the DE 100 23 698 A1 shows a mixing and dissolving machine with a mixing spiral rotating around a vertical axis of rotation, conveying upwards, wherein said first mixing spiral is followed by a second mixing spiral in the axial direction and a transition zone extends between the mixing spiral in the axial direction.
  • the FR 2 346 977 A2 shows a mixing trough with a mixer arranged centrally on an upper side of the mixing trough, which has a drive shaft with curved stirring blades attached directly to the drive shaft, which projects into an interior of the mixing trough from above.
  • JP 2015-33658 discloses an agitator device according to the preamble of claim 1.
  • the object of the invention is in particular to provide a stirrer device with improved properties with regard to a mixing behavior.
  • the object is solved by the features of claim 1, while advantageous refinements and developments of the invention can be found in the subclaims.
  • the invention relates to a radially conveying agitator device according to claim 1, in particular for mixing medium-viscosity to highly viscous media, with at least one agitator hub (10) which is provided to rotate about an axis of rotation (12), with at least one agitator blade (14) and with at least one a support arm (16) which connects the agitator blade (14) to the agitator hub (10), there being at least one semi-straight line (18) starting from the axis of rotation (12) which indicates a center of gravity of a connecting surface area (20) of the support arm (16) the agitator hub (10) cuts and which is free of intersections with the agitator blade (14), and wherein the agitator blade (14) has at least one bend (22) which divides the agitator blade (14) into at least two agitator blade sections (24, 26) .
  • the stirrer device advantageously has a plurality of stirring blades, preferably at least substantially identical to one another, in particular at least two, preferably exactly two, stirring blades, and / or a plurality of, preferably at least substantially identical to, support arms, in particular at least two, preferably exactly two, support arms .
  • the phrase “at least essentially identical to one another” is to be understood in particular, apart from manufacturing tolerances, to be identical to one another.
  • a “stirrer device” is to be understood in particular to mean at least a part and / or an assembly, in particular a subassembly, of a stirrer, in particular an axially conveying stirrer and advantageously a radially promoting stirrer.
  • the stirring element device can also comprise the entire stirring element, in particular the entire axially conveying stirring element and advantageously the entire radially promoting stirring element.
  • the stirring element is different from a propeller and / or fan wheel, in particular for conveying air.
  • the Stirring device is preferably provided to generate a piston flow in at least one operating state.
  • a “medium-viscous to highly viscous medium” should be understood to mean in particular a, in particular single-phase and / or multiphase medium, in particular with at least one solid, at least one liquid and / or at least one gaseous phase, which in particular has rheologically clearly non-Newtonian properties , such as pseudoplastic media and / or media with flow limits.
  • a viscosity and / or an apparent viscosity of the medium-viscosity to high-viscosity medium, in particular on the stirrer is between 0.5 Pa ⁇ s (Pascal seconds) and 200 Pa ⁇ s, in particular at shear rates of 10 / s, especially without gas components, preferably between 1 Pa ⁇ s and 100 Pa ⁇ s and particularly preferably between 2 Pa ⁇ s and 30 Pa ⁇ s.
  • the medium to high viscosity medium preferably comprises biomass.
  • the medium-viscosity to high-viscosity medium leads to a Reynolds number in the range between 10 and 10,000, advantageously between 15 and 8000, preferably between 25 and 5000 and particularly preferably between 30 and 1000.
  • the stirrer device is designed in this way, in particular by a special shape and / or a special material to process such medium-viscous to highly viscous media.
  • the stirring blade is in particular at least essentially plate-like and particularly preferably in one piece.
  • the stirring blade can have any contour and / or shape that appears useful to a person skilled in the art, such as, for example, at least essentially rectangular, triangular and / or trapezoidal.
  • a "main plane of extent" of an object is to be understood in particular as a plane which is parallel to a largest side surface of a smallest imaginary cuboid, which still just completely surrounds the object, and in particular through a center, in particular a geometric center, of the cuboid runs.
  • "one-piece” is to be understood in particular to be at least cohesively connected.
  • the cohesive connection can be produced, for example, by an adhesive process, a welding process, a soldering process and / or another process which appears to be useful to a person skilled in the art is understood to be formed in one piece, but in one piece. This one piece is preferably produced from a single blank and / or a casting.
  • the agitator hub is in particular intended to accommodate at least one agitator shaft in at least one operating state and / or on the at least e to be attached to an agitator shaft.
  • the at least one agitator shaft defines in particular the axis of rotation.
  • the axis of rotation is advantageously arranged parallel to a main direction of extent of the agitator shaft.
  • the axis of rotation particularly preferably extends, in particular when viewed perpendicular to the main plane of extension of the agitator shaft, through a, in particular geometric, center point of the agitator shaft.
  • a "main direction of extension" of an object is to be understood in particular as a direction which is parallel to a longest edge of a smallest geometric cuboid which just just completely surrounds the object.
  • the agitator hub is advantageously formed in one piece.
  • the at least one agitator hub is provided in particular for fastening the agitator blade.
  • the stirring blade is preferably arranged on the stirring organ hub in such a way that the main extension plane of the stirring blade and the axis of rotation are oriented at least substantially parallel to one another.
  • “At least substantially parallel” is to be understood to mean in particular an orientation of at least one direction relative to at least one reference direction, in particular in one plane, the direction being opposite the reference direction has a deviation in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °.
  • “Provided” is to be understood in particular to be specially designed and / or equipped.
  • the support arm can be designed as any connection element, in particular holding element, which appears to be useful to a person skilled in the art, for example as a support plate.
  • the support arm is preferably designed as a rod-shaped spar.
  • the support arm is particularly preferably formed in one piece.
  • the support arm is particularly free of sharp edges.
  • a “connection surface area” is to be understood in particular as a near-surface area and / or a contact surface on which the support arm is connected to the agitator hub.
  • a "near-surface area” is to be understood in particular as a spatial area which is formed from points which are each a distance of at most 5%, advantageously at most 2%, preferably at most 0.5% and particularly preferably at most 0 , 1% of a total stirrer diameter from a reference point.
  • the stirring blade, the stirring organ hub and / or the support arm can at least partially, preferably to a large extent and particularly preferably completely consist of an alloy and / or a metal, in particular stainless steel, duplex steel and / or titanium.
  • the stirring blade, the stirring organ hub and / or the support arm advantageously consist of the same material.
  • the expression “to at least a large part” is to be understood in particular to mean at least 50%, preferably at least 70% and particularly preferably at least 90%.
  • the medium-viscous to highly viscous medium can also advantageously be mixed in the vicinity of a container wall and dead zones can be effectively avoided.
  • a uniform input of power in particular temporal and / or spatial power input, can be achieved in the medium-viscous to highly viscous medium.
  • a structurally simple and advantageously cost-efficient stirrer device can advantageously be provided.
  • an optimized geometry of the agitator with an advantageously reduced performance coefficient, operating times, in particular when stirring and / or mixing medium-viscosity to highly viscous media, in particular for the digestion of biomass can reduce and advantageously reduce costs.
  • a main direction of extension of the stirring blade with the semi-straight line encloses an angle between 45 ° and 135 °, preferably between 55 ° and 125 ° and particularly preferably between 70 ° and 110 °. In this way, an at least essentially radial flow can advantageously be generated.
  • the support arm is at least essentially L-shaped, as a result of which an advantageous fluid flow, in particular of a medium-viscosity to high-viscosity medium, in particular in the vicinity of the agitator shaft, can be generated. If the support arm is arranged at least substantially at half the height of the stirring blade, in particular centrally on the stirring blade, a fluid flow can be further optimized.
  • the phrase "at least essentially halfway up” is to be understood in particular to mean that a distance of the support arm from a central connection point of the stirring blade is at most 0.5%, preferably corresponds to at most 0.1% and particularly preferably at most 0.05% of a total stirrer organ diameter.
  • the stirring blade advantageously has n bevels, which divides the stirring blade into at least two and advantageously n + 1 stirring blade sections.
  • n corresponds in particular to an integer between 1 and 25, advantageously between 1 and 15, preferably between 1 and 10 and particularly preferably between 1 and 5.
  • An edging angle, in particular an inside angle, the fold is in particular between 91 ° and 175 ° , preferably between 105 ° and 165 ° and particularly preferably between 130 ° and 160 °. This can advantageously increase flexibility.
  • the fold in particular a bending axis of the fold, is arranged at least substantially parallel to the axis of rotation. In this way, a conveying behavior in the radial direction can advantageously be adapted to different needs. It is also proposed that a main extension length of the stirring blade sections decrease from an inner edge of the stirring blade of the stirring blade in the direction of an outer edge of the stirring blade of the stirring blade.
  • An innermost stirring blade section advantageously has a main extension length of between 2% and 45%, advantageously between 10% and 40%, preferably between 20% and 35% and particularly preferably between 27% and 31%, of a total stirring element diameter.
  • a “main extension length” of an object is to be understood in particular as a length, in particular of the object, which is parallel to a longest edge of a smallest geometric cuboid, which just just completely surrounds the object.
  • a “stirring blade inner edge” of the stirring blade is also to be understood in particular to mean a stirring blade edge, in particular a side face, of the stirring blade, which in particular in an assembled state and / or in at least one operating state of the axis of rotation and / or the stirring element hub is facing.
  • a “stirring blade outer edge” of the stirring blade is to be understood in particular as a stirring blade edge, in particular a side face, of the stirring blade, which is turned away from the axis of rotation and / or the stirring element in particular in an assembled state and / or in at least one operating state.
  • a mixing behavior can be optimized and a radial and axial delivery behavior can be individually adapted.
  • a blade height of the stirring blade decrease in the direction of an outer edge of the stirring blade.
  • the blade height advantageously changes strictly monotonously, advantageously linearly, at least in a central region of the stirring blade, in particular with reference to a main direction of extension of the stirring blade, and / or an outer region of the stirring blade, in particular with reference to a main direction of extension of the stirring blade.
  • the blade height is particularly preferably constant at least in an inner region of the stirring blade, in particular with respect to a main direction of extension of the stirring blade, as a result of which, in particular, insertion and / or threading of the stirring member into a manhole can be simplified.
  • blade height in the inner region of the stirring blade changes strictly monotonously, advantageously linearly, in particular with respect to a main direction of extension of the stirring blade.
  • a “blade height” of the stirring blade is to be understood in particular to mean an extension of the stirring blade which, in particular in an assembled state and / or in at least one operating state, is arranged at least substantially parallel to the axis of rotation.
  • an “inner area” of the stirring blade is to be understood in particular to mean an area of the stirring blade which, in particular in an assembled state and / or in at least one operating state, faces the axis of rotation and / or the stirring element.
  • An “outer area” of the stirring blade is to be understood in particular to mean an area of the stirring blade which faces away from the axis of rotation and / or the stirring element in particular in an assembled state and / or in at least one operating state.
  • Under a “middle area” of the The stirring blade is to be understood in particular as an area of the stirring blade which, in particular in an assembled state and / or in at least one operating state, directly adjoins the inner region and the outer region. This can in particular improve the homogeneity of a power input, in particular a temporal and / or spatial power input, into the medium-viscous to highly viscous medium and, in particular, a radial flow behavior along the stirring blade.
  • a particularly advantageous flow behavior can be achieved if a blade height of the stirring blade in a near region of an inner edge of the stirring blade of the stirring blade corresponds to between 1% and 30%, preferably between 3% and 20% and particularly preferably between 5% and 15% of a total stirring element diameter.
  • a “close range” is to be understood in particular to mean a spatial area which is formed from points which are each a distance of at most 10%, advantageously at most 5%, preferably at most 2% and particularly preferably at most 1% of a total stirrer organ diameter of have a reference point and / or a reference component.
  • a blade height of the stirring blade in a close range of an outer edge of the stirring blade corresponds to between 0.5% and 15% and preferably between 1% and 5% of a total stirring element diameter, an optimized power input can be achieved in particular.
  • the agitator hub, the support arm and the agitator blade are at least partially integrally and advantageously integrally formed with one another. This can increase the stability of the agitator device in particular. In addition, fatigue strength and / or service life can be increased, which in particular reduces maintenance and replacement intervals and downtimes can be significantly reduced.
  • a stirring system is proposed with at least one, in particular vertically arranged, container, in particular pressure container, in particular for holding medium-viscosity to highly viscous media, and with at least two stirring elements arranged in the container, each with at least one stirring element device.
  • the stirring system can in particular comprise at least one stirring shaft.
  • the stirring elements are advantageously arranged one above the other on the, in particular common, stirring shaft and in particular in the vertical direction.
  • the stirring elements advantageously form at least two stirring stages.
  • Each stirring member particularly preferably forms at least one, advantageously exactly one, stirring stage.
  • each of the stirring elements and / or each stirring stage defines at least one compartment, in particular a mixing chamber, of the container.
  • each of the stirring elements and / or each stirring stage can also form at least two, advantageously exactly two, compartments.
  • An axis of rotation is preferably arranged in particular parallel to an, in particular vertically arranged, container axis and / or the container.
  • the stirring system can preferably also comprise a plurality of stirring elements, in particular at least three, at least four and / or at least five stirring elements, which can in particular be arranged and / or attached to a, in particular common, stirring shaft, in particular one above the other.
  • the stirring system can further comprise in particular at least one medium-viscosity to high-viscosity medium arranged in particular in the container.
  • the medium-viscosity to high-viscosity medium preferably flows through the container, advantageously continuously, in the axial direction, in particular from top to bottom, in particular due to an external and / or externally impressed flow component.
  • the stirring system is particularly intended to generate a piston flow in at least one operating state.
  • the stirring system is advantageously provided to generate an at least substantially radial flow and, in particular, to suppress and / or close at least substantially an, in particular additional, axial flow, in particular generated by the stirring elements, in particular with respect to the axis of rotation and / or container axis prevent.
  • an object is intended to "at least substantially suppress an axial flow” should be understood in particular to mean that the object is intended to influence a flow behavior in such a way that an, in particular additional, impressed by the object axial flow corresponds to at most 30%, advantageously at most 20%, preferably at most 10% and particularly preferably at most 5% of a total and / or effective axial flow.
  • a stirring system that is optimized and durable, in particular with regard to a mixing behavior, can be provided, wherein a conveying behavior in the radial direction can be influenced in a targeted manner and an axial mass transfer between individual stirring stages and / or individual compartments can be suppressed at least partially and preferably to a large extent, whereby advantageously a narrow residence time distribution in the individual stirring stages and / or compartments can be achieved.
  • the special design of the agitator device can provide an agitator which is advantageously adapted to a geometry of the container, whereby in particular an almost optimal piston flow can be achieved.
  • the invention comprises a method according to claim 11, which is a method for operating a stirring system, wherein a medium-viscosity to high-viscosity medium arranged in a container is mixed in such a way that an, in particular additional, axial flow, in particular generated by stirring elements, is at least substantially suppressed and in particular a, at least essentially, radial flow is generated.
  • the stirring system can advantageously the, in particular vertically arranged, container, in particular pressure container, in particular for holding medium-viscosity to highly-viscous media, at least two stirring elements arranged in the container, at least one stirring shaft and / or at least one, in particular arranged in the container, medium-viscosity to high-viscosity Include medium.
  • the stirring system can preferably also comprise a plurality of stirring elements, in particular at least three, at least four and / or at least five stirring elements, which in particular on one, in particular common, stirrer shaft, in particular one above the other, can be arranged and / or attached.
  • the stirring system particularly preferably corresponds to the aforementioned stirring system, the at least two stirring elements arranged in the container each comprising at least one stirring element device, in particular a radial-promoting stirring element device, in particular for mixing medium-viscosity to highly-viscous media, with at least one stirring element hub which is provided for the purpose of To rotate the axis of rotation, with at least one stirring blade and with at least one support arm, which connects the stirring blade to the agitator hub, with at least one semi-straight line extending from the axis of rotation, which intersects a center of gravity of a connecting surface area of the support arm to the agitator hub and which is free of intersections with the Stirring blade is.
  • Mixing behavior can hereby advantageously be improved.
  • the at least two stirring elements form at least two stirring stages and a piston flow is generated in the container, the medium-viscosity to high-viscosity medium being mixed in such a way that an average residence time at least in the individual stirring stages is at least essentially identical, in particular apart from operating tolerances , is.
  • an optimized mixing behavior can be achieved, wherein advantageously an at least essentially radial flow is generated and in particular an axial flow, in particular initiated by the stirring elements, can be at least substantially prevented.
  • an axial product exchange between the compartments can be at least partially suppressed.
  • the stirring device should not be limited to the application and embodiment described above.
  • the agitator device can have a number that differs from a number of individual elements, components and units specified here to fulfill a function described here.
  • the Figures 1 to 3 show a stirring member 32 designed as a radial stirrer in a fully assembled state in a perspective view (cf. Figure 1 ), in a top view (cf. Figure 2 ) and in a side view (cf. Figure 3 ).
  • the stirring element 32 is formed in one piece in the present case. Alternatively, it is conceivable to design a stirring element in several parts, for example by means of at least one screw connection.
  • the stirring element 32 comprises a stirring element device, in particular a radially promoting device.
  • the stirrer device is intended for mixing highly viscous media. In the present case, the agitator device is intended for the digestion of biomass and in particular for use in the production of ethanol.
  • the agitator device has an agitator hub 10.
  • the agitator hub 10 is formed in one piece in the present case.
  • the agitator hub 10 is made entirely of stainless steel. Alternatively, however, a stirrer hub is also conceivable to train in several parts.
  • the agitator hub could for example be formed in two parts and / or four parts, preferably with identical agitator hub parts.
  • the agitator hub 10 is provided to, in at least one operating state, an agitator shaft 36 (cf. in particular Figure 4 ) record.
  • the agitator hub 10 is intended to be attached to the agitator shaft 36.
  • An orientation of the agitator shaft 36 defines an axis of rotation 12 of the agitator device.
  • the agitator hub 10 is provided to rotate about the axis of rotation 12. In the present case, the agitator hub 10 is provided for rotating in both directions about the axis of rotation 12.
  • the stirrer device comprises a plurality of stirrer blades 14.
  • the stirrer device comprises two stirrer blades 14.
  • FIGS Figures 1 to 3 only one of the stirring blades 14 provided with reference numerals.
  • the stirring blades 14 are at least essentially identical to one another.
  • the stirring blades 14 are at least substantially plate-shaped.
  • the stirring blades 14 have an at least substantially constant material thickness.
  • the stirring blades 14 are formed in one piece.
  • the stirring blades 14 are made entirely of stainless steel. When viewed perpendicular to a main extension plane of the respective stirring blade 14, the stirring blades 14 are at least substantially trapezoidal (cf. in particular Figure 3 ).
  • the stirring blades 14 each have an inner stirring edge 28 and an outer edge 30 of the stirring blade. Furthermore, the stirring blades 14 are arranged at angular intervals of approximately 180 ° to one another. Alternatively, an agitator device could also have three agitator blades, which are arranged in particular at angular intervals of 120 ° to one another, and / or four agitator blades which are in particular arranged at angular intervals of 90 ° to one another. Alternatively, it is also conceivable that a stirrer device has more than four stirring blades, for example at least five, at least six, at least eight and / or at least ten stirring blades. The stirring blades 14 are spaced apart from the stirring organ hub 10.
  • the stirring blades 14 are in an assembled state, such as on the Stirring organ hub 10 arranged that the main extension plane of the respective stirring blade 14 and the axis of rotation 12 are oriented at least substantially parallel to one another. In the present case, the stirring blades 14 are indirectly attached to the stirring organ hub 10.
  • the agitator device comprises a plurality of support arms 16.
  • the agitator device comprises two support arms 16.
  • Each support arm 16 is assigned to one of the agitator blades 14.
  • the support arms 16 are at least essentially identical to one another.
  • the support arms 16 are integrally formed.
  • the support arms 16 are made entirely of stainless steel.
  • the support arms 16 are each designed as a rod-shaped spar.
  • the support arms 16 are at least essentially cylindrical, in particular circular cylindrical. In the present case, the support arms 16 are at least substantially L-shaped when viewed perpendicular to the axis of rotation 12.
  • the support arms 16 are provided to connect the agitator blades 14 to the agitator hub 10.
  • the support arms 16 are attached on the one hand to the agitator hub 10 and on the other hand to one of the agitator blades 14.
  • the support arms 16 are integrally formed with the agitator hub 10.
  • a contact surface between the respective support arm 16 and the agitator hub 10 corresponds to a connecting surface area 20 of the support arm 16 to the agitator hub 10.
  • An angle between the support arms 16 and the axis of rotation 12 corresponds to 90 ° in the present case.
  • at least one support arm with an axis of rotation has an angle deviating from 90 °.
  • the support arms 16 are formed in one piece with the respective stirring blade 14.
  • the support arms 16 are arranged halfway up the respective stirring blade 14, in particular centrally on the respective stirring blade 14.
  • the support arms 16 extend at least in large part parallel to a main direction of extent 38 of the respective stirring blade 14.
  • the support arms 16 extend at least in large part along one Main extension length of the stirring blade 14.
  • a material thickness of the support arms 16 and / or a diameter of the support arms 16 is at least substantially constant.
  • a material thickness of support arms and / or a diameter of the support arms decreases in the direction of an outer edge of the stirring blade.
  • all other fastening options that appear reasonable to a person skilled in the art are also conceivable.
  • At least one support arm is at least partially and / or completely non-positively and / or positively connected in an assembled state, such as in particular by means of a screw connection and / or a plug connection, with a stirring blade and / or a stirring organ hub.
  • a stirring blade and / or a stirring organ hub it is also conceivable to design an agitator hub, at least one support arm and / or at least one agitator blade from another material, such as stainless steel, which appears to be useful to a person skilled in the art.
  • stirring blades 14 and of the support arm 16 assigned to the stirring blade 14 are described, the following description being adopted for the other, in particular at least essentially identical, stirring blade and the other, in particular at least substantially identical, supporting arm can be.
  • the main direction of extent 38 of the stirring blade 14 with the semi-straight line 18 includes an angle ⁇ of approximately 105 °.
  • the stirring blade 14 has a bevel 22.
  • the bevel 22 is arranged parallel to the axis of rotation 12.
  • the bevel 22 is arranged on a side of the stirring blade 14 facing the outer edge 30 of the stirring blade.
  • a bend angle ⁇ of the bevel 22 is approximately 150 °.
  • the bevel 22 divides the stirring blade 14 into two stirring blade sections 24, 26.
  • a main extension length of the stirring blade sections 24, 26 decreases from that Inner edge 28 of the stirring blade in the direction of the outer edge 30 of the stirring blade.
  • An inner stirring blade section 24 of the stirring blade sections 24, 26 has a main extension length of about 29% of a total stirring element diameter.
  • An outer stirring blade section 26 of the stirring blade sections 24, 26 has a main extension length of approximately 10% of a total stirring element diameter.
  • a stirring blade has a plurality of bends, such as at least two and / or at least three bends.
  • the blade height of the stirring blade 14 is constant.
  • the blade height of the stirring blade 14 changes linearly.
  • the blade height of the stirring blade 14 changes linearly.
  • a slope of a change in the blade height of the stirring blade 14 in the central region corresponds at least essentially to a slope of a change in the blade height of the stirring blade 14 in the outer region.
  • a blade height of the stirring blade 14 in the vicinity of the inner edge 28 of the stirring blade corresponds in the present case to approximately 8% of a total diameter of the stirring element. Furthermore, a blade height of the stirring blade 14 in a near region of the outer edge 30 of the stirring blade corresponds to approximately 2% of a total stirring element diameter. Alternatively, it is conceivable that a blade height of the stirring blade changes linearly over an entire longitudinal extent of the stirring blade.
  • FIG 4 shows an exemplary, in particular continuously operated and flowed through, stirring system with a vertically arranged container 34 and a plurality of stirring elements 32 arranged in the container 34.
  • at least two stirring elements 32 are arranged in the container 34.
  • the stirring elements 32 are at least essentially identical to one another.
  • the stirring elements 32 correspond to the stirring element 32 from the Figures 1 to 3 .
  • each of the stirring elements 32 has a stirring element device according to the invention.
  • the stirring elements 32 are multi-stage stirrers educated.
  • the stirring elements 32 are arranged on a common stirring shaft 36.
  • the stirring elements 32 are arranged one above the other on the stirring shaft 36.
  • Each of the stirring elements 32 forms a stirring stage.
  • each of the stirring elements 32 and / or each stirring step defines at least one compartment, in particular a mixing space, of the container 34.
  • the stirring elements 32 are arranged in the container 34 such that the axis of rotation 12 is arranged parallel to a vertically arranged container axis.
  • stirring elements offset from one another for example offset by 30 °, 45 °, 60 ° and / or 90 ° to one another, and / or mirror-inverted to one another in a container.
  • a medium-viscous to highly viscous medium (not shown) is arranged in the container 34.
  • the medium-viscosity to high-viscosity medium comprises biomass, in particular in the form of a phase.
  • the medium-viscous to highly viscous medium flows continuously through the container 34 from top to bottom.
  • a Reynolds number is between 30 and 500.
  • the stirring system is intended to generate a piston flow.
  • the stirring system and in particular the respective stirring elements 32 is / are intended to generate an at least essentially radial flow and to at least substantially prevent an additional axial flow generated by the stirring elements 32.
  • An axial flow component of the medium-viscous to highly viscous medium and / or a product exchange between the individual compartments results at least essentially exclusively from a continuous flow through the container 34 impressed from the outside, while a product exchange between the individual compartments initiated by the stirring elements 32 is at least essentially is avoided.
  • a constructive one The design and / or design of the stirring elements 32 makes a significant contribution to stabilizing the individual stirring stages and / or compartments.
  • the medium-viscosity to high-viscosity medium is mixed by means of the stirring system in such a way that an average residence time ⁇ , in particular the particles and / or the volume elements of the medium-viscosity to high-viscosity medium, is at least essentially identical in the individual stirring stages and / or the individual compartments.
  • V corresponds to a volume of the respective compartment and Q corresponds to a volume flow, advantageously impressed from the outside, with which the container 34 flows.
  • the mean residence time ⁇ in the individual stirring stages is, advantageously significantly, greater than a mixing time ⁇ of the stirring stage.
  • the mean residence time ⁇ is at least 1 ⁇ ⁇ , preferably at least 3 ⁇ ⁇ and particularly preferably at least 6 ⁇ ⁇ .
  • the mean residence time ⁇ is advantageously at most 30 ⁇ ⁇ , preferably at most 20 ⁇ ⁇ and particularly preferably at most 10 ⁇ ⁇ .
  • An advantageous mixing behavior can be achieved by such a stirring system, whereby in particular an axial product exchange between the compartments can be reduced and the formation of a narrow residence time distribution can be promoted.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Claims (12)

  1. Dispositif d'organe d'agitation à convoyage radial, avec au moins un moyeu d'organe d'agitation (10) prévu pour tourner autour d'un axe de rotation (12), avec au moins une pale d'agitation (14) et avec au moins un bras-support (16) reliant la pale d'agitation (14) au moyeu d'organe d'agitation (10), où il y a une demi-droite (18) partant de l'axe de rotation (12) qui coupe un centre de masse d'une surface de connexion (20) du bras-support (16) au moyeu d'organe d'agitation (10) et qui est dépourvue des points d'intersection avec la pale d'agitation (14), et où la pale d'agitation (14) comprend au moins un biseautage (22) qui divise la pale d'agitation (14) en au moins deux sections de pale d'agitation (24, 26), où le biseautage (22) est disposé au moins sensiblement parallèlement à l'axe de rotation (12), caractérisé en ce que le bras-support (16) est réalisé au moins essentiellement en forme de L.
  2. Dispositif d'organe d'agitation à convoyage radial selon la revendication 1, caractérisé en ce que, vue dans la direction de l'axe de rotation (12), une direction principale d'extension (38) de la pale d'agitation (14) inclue un angle (α) entre 45° et 135° avec la demi-droite (18).
  3. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce que le bras-support (16) est disposé au moins essentiellement à la moitié de la hauteur de la pale d'agitation (14).
  4. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une longueur d'extension principale des sections de pale d'agitation (24, 26) diminue d'un bord intérieur de pale d'agitation (28) de la pale d'agitation (14) vers un bord extérieur de pale d'agitation (30) de la pale d'agitation (14).
  5. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une hauteur-pale de la pale d'agitation (14) diminue vers un bord extérieur de pale d'agitation (30) de la pale d'agitation (14).
  6. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une hauteur-pale de la pale d'agitation (14) à proximité d'un bord intérieur de pale d'agitation (28) de la pale d'agitation (14) est équivalente à entre 1 % et 30 % d'un diamètre total d'organe d'agitation.
  7. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une hauteur-pale de la pale d'agitation (14) à proximité d'un bord extérieur de pale d'agitation (30) de la pale d'agitation (14) est équivalente à entre 0,5 % et 15 % d'un diamètre total d'organe d'agitation.
  8. Dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes, caractérisé en ce que le moyeu d'organe d'agitation (10), le bras-support (16) et la pale d'agitation (14) sont formés au moins partiellement intégralement.
  9. Organe d'agitation radiale avec un dispositif d'organe d'agitation à convoyage radial selon l'une quelconque des revendications précédentes.
  10. Système d'agitation avec au moins un conteneur (34) et au moins deux organe d'agitation radiale (32) selon la revendication 9 qui sont disposés dans le conteneur (34).
  11. Procédé de fonctionnement d'un système d'agitation selon la revendication 10, caractérisé en ce qu'un milieu de moyenne à haute viscosité disposé dans un conteneur (34) est mélangé de telle façon qu'un écoulement axial est au moins sensiblement supprimé.
  12. Procédé de fonctionnement d'un système d'agitation selon la revendication 11, caractérisé en ce qu'un flux de piston est généré dans le conteneur (34).
EP16719396.0A 2015-04-28 2016-04-28 Système d'organe d'agitation Active EP3288674B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015106512.6A DE102015106512A1 (de) 2015-04-28 2015-04-28 Rührorganvorrichtung
PCT/EP2016/059506 WO2016174146A1 (fr) 2015-04-28 2016-04-28 Système d'organe d'agitation

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EP3288674A1 EP3288674A1 (fr) 2018-03-07
EP3288674B1 true EP3288674B1 (fr) 2020-04-01

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US (1) US9968896B1 (fr)
EP (1) EP3288674B1 (fr)
DE (1) DE102015106512A1 (fr)
DK (1) DK3288674T3 (fr)
WO (1) WO2016174146A1 (fr)

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AU2018303332B2 (en) * 2017-07-17 2023-11-09 Commonwealth Scientific And Industrial Research Organisation Mixing apparatus and method of operation
KR20220137646A (ko) * 2020-02-03 2022-10-12 라이프 테크놀로지스 코포레이션 모듈식 임펠러를 구비한 유체 혼합 시스템 및 관련 방법
CN112387161A (zh) * 2020-11-16 2021-02-23 东莞市米儿塑胶原料有限公司 一种防撒料的聚氨酯树脂搅拌装置及其使用方法
CN114797529A (zh) * 2022-05-24 2022-07-29 重庆大学 一种强化磷矿酸解的弹性折叠搅拌桨
CN115282829B (zh) * 2022-08-17 2024-03-19 中交公路养护工程技术有限公司 一种生物质沥青再生剂生产制备装置
CN116948777B (zh) * 2023-09-18 2023-12-08 山西荣欣酿造有限公司 一种醋的发酵装置及其使用方法

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Also Published As

Publication number Publication date
US9968896B1 (en) 2018-05-15
US20180126341A1 (en) 2018-05-10
DK3288674T3 (da) 2020-06-22
EP3288674A1 (fr) 2018-03-07
DE102015106512A1 (de) 2016-11-03
WO2016174146A1 (fr) 2016-11-03

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