Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
  • C02F3/1284—Mixing devices
• • 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
  • B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
• • 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
  • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
  • B01F27/054—Deformable stirrers, e.g. deformed by a centrifugal force applied during operation
• • 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
  • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
  • B01F27/71—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers
  • B01F27/711—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers co-operating with stationary guiding means, e.g. baffles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
  • B01F35/55—Baffles; Flow breakers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
  • B01F2101/305—Treatment of water, waste water or sewage
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

• the invention relates to a horizontal agitator according to the preamble of claim 1. It further relates to a method for generating a flow in a clarifier according to the preamble of claim 22.
• a horizontal agitator is known.
• a propeller is connected to a drive device.
• the drive device comprises a submersible motor, which usually drives the propeller via a gearbox.
• the submersible motor is arranged axially to the propeller, d. H. a drive shaft of the submersible motor extends substantially parallel to a rotational axis of the propeller.
• horizontal agitators are known in which the submersible motor, although axially offset from the propeller, but not arranged in a plane passing through an axis of rotation of the propeller horizontal plane. Ie. In this case, the submersible motor is arranged either below or above the horizontal plane passing through the axis of rotation of the propeller.
• Conventional horizontal agitators are mounted on a rack which is mounted near the wall of a clarifier or on a bridge.
• the action of the propeller produces a horizontal flow directed from the submersible motor or from the frame to the propeller.
• the efficiency of the known horizontal agitators is not particularly high.
• conventional horizontal agitators are not very universal. To achieve the best possible efficiency, it is necessary according to the state of the art, depending on the size of the clarifier, to select a suitable propeller and to operate it with a suitable predetermined rotational speed.
• Each horizontal agitator must therefore be designed for the respective application. That's expensive.
• the object of the invention is to eliminate the disadvantages of the prior art.
• a horizontal agitator and a process are to be specified with which a horizontal flow in a clarifier can be produced with improved efficiency.
• a universally applicable horizontal agitator is to be provided.
• the propeller and the submersible motor are designed such that during operation of the submersible motor, a directed from the propeller to the submersible flow is generated.
• the efficiency of a horizontal agitator can be significantly improved in a surprisingly simple manner.
• the reason for the improvement of the efficiency lies essentially in the fact that according to the subject invention on the suction side of the propeller there are no flow obstacles, in particular the submersible motor and a frame for receiving the submersible motor. As a result, a larger amount of liquid per time sucked and accelerated in a horizontal direction.
• an elastic change in shape of the blades made of an elastically deformable material is adjusted so that their Profileanstellwinkel increases at least in the region of a radially outer portion with increasing rotational speed in a predetermined manner.
• profile setting angle is understood to mean an angle with which the sheets are set or inclined relative to a radial plane running perpendicular to the axis of rotation of the propeller. Due to the set in a defined manner predetermined elastic shape change of the leaves can be achieved that the propeller not only at a certain rotational speed but in a rotation speed or speed range can be operated with a high efficiency. As the rotational speed increases, the fluid pressure on the blades increases.
• the proposed horizontal agitator can thus be used universally in clarifiers of different sizes, without the need to provide a different propeller. This manufacturing costs can be saved.
• the propeller can have two, three, four, five or more blades.
• the propeller may be a left or right hand propeller.
• the blades are made of fiber-reinforced composite manufactured material.
• the matrix of the composite is expediently made of plastic.
• These may be conventionally known resins which are suitable for the production of composite materials, for. For example, epoxy resins and the like.
• the composite may contain as fibers carbon and / or aramid and / or highly drawn polyethylene fibers.
• the adjustment of the elastic deformation of the sheets can be done by the selection, the amount and the arrangement of the fibers. Furthermore, the elastic deformation, in particular the elastic change of the Profilanstellwinkels be adjusted by the thickness of the profile.
• a surface of the sheet can be subdivided into surface elements and a modulus of elasticity assigned to each surface element. Then, in the production by varying the type, amount and arrangement of the fibers and the thickness of the profile of the respective modulus of elasticity can be adjusted.
• the propeller has a density in the range of 0.9 to 1.1 g / cm 3 .
• the density thus substantially corresponds to the density of the liquid medium surrounding the propeller, in particular to wastewaters to be clarified.
• the proposed adaptation of the density of the propeller to the surrounding liquid medium avoids a radial force on the propeller axis due to density differences. This increases the durability of bearings receiving the propeller shaft.
• radially outer end sections of the blades are bent in a direction opposite to the axial main flow direction generated by the propeller. This can prevent unwanted radial and axial movement in the area of the blade ends Mainstream form opposing side flows. Such sidestreams reduce the efficiency of the propeller.
• the proposed bending of the blade ends is used in particular in the case of stiff blades whose profile pitch does not change significantly with increasing rotational speed.
• end section is understood to mean a radially outer region of the blade which contains the tip of the blade.
• the "end portion” usually has a smaller radial length than the "radially outer portion” on. But it may also be that the "radially outward section” is the same length as the "end section”.
• the bent-over end sections have, in a radial plane, a curvature opposite to the direction of rotation of the propeller. This can be prevented in a simple manner that so-called “braiding impurities", such as threads, cords, hair and the like. , to be caught by the bent end section.
• the submersible motor is mounted axially to the propeller. Ie. the submersible motor is downstream of the propeller in the region of a hub of the same.
• the drive shaft of the submersible motor and the axis of rotation of the propeller are parallel or on one and the same axis.
• two propellers rotating in opposite directions about the same axis of rotation are provided. It is in which one propeller is a right-handed and the other propeller to a left-handed propeller, so that both propellers in the sense of the present invention produce a directed towards the submersible flow.
• both propellers in the sense of the present invention produce a directed towards the submersible flow.
• plate-shaped flow-guiding elements extending in at least one axial plane are provided downstream of the at least one propeller.
• the term "axial plane” is understood to mean a plane which runs parallel to the axis of rotation of the propeller or contains the axis of rotation.
• the flow guide elements are expediently made of sheet metal or fiber-reinforced plastic. They can extend in a vertical plane and / or a horizontal plane.
• the flow guide elements can be attached to a submount motor receiving frame or at the bottom of a Klärbeckens be attached. However, it may also be that the flow guide elements are attached to the submersible motor or to a drive device comprising the submersible motor.
• the drive device may comprise, for example, a transmission in addition to the submersible motor.
• the submersible motor or the drive device can be fastened to a vertical movement device provided on the frame. This makes it possible to raise or lower the horizontal agitator in the clarifier.
• an inflow edge of the flow guide elements has an inclination or curvature pointing in the main flow direction with increasing radial distance. This ensures that no pest-forming impurities can accumulate on the flow guide. Rather, they are conditionally moved by the flow along the inclined or curved leading edge until they are flushed away from the flow guide.
• a device for clarifying wastewater with a clarifier and at least one horizontal agitator according to the invention received therein is provided.
• the invention provides a method for generating a flow in a clarifier with a horizontal agitator, in which a propeller having multiple blades is connected to an axially arranged submersible motor, wherein the propeller is rotated by the submersible motor such that one from the propeller to Submersible flow is generated.
• the prescribed horizontal agitator according to the invention is used to generate the flow.
• 1 is a front view of a first horizontal agitator
• FIG. 1 is a side view of FIG. 1,
• FIG. 3 is a plan view of FIG. 1,
• FIG. 4 is a perspective view of the first horizontal agitator of FIG. 1,
• FIG. 5 is a front view of a second horizontal agitator
• FIG. 6 is a side view of FIG. 5,
• FIG. 7 is a plan view of FIG. 5,
• FIG. 8 is a perspective view of the second horizontal agitator shown in FIG. 5,
• FIG. 9 is a front view of a third horizontal agitator
• FIG. 10 is a side view of FIG. 9,
• FIG. 11 is a plan view of FIG. 9, 12 is a perspective view of the third horizontal agitator of FIG. 9,
• FIG. 13 is a front view of a fourth horizontal agitator
• FIG. 14 is a side view of FIG. 13,
• FIG. 15 is a plan view of FIG. 13,
• FIG. 16 is a perspective view of the fourth horizontal agitator shown in FIG. 13 and
• FIG. 17 is a detail view of FIG. 16.
• a submersible motor 1 is connected in an axial arrangement with a propeller 2 drivingly.
• the propeller 2 has two blades 4 extending radially from a hub 3.
• the submersible motor 1 is accommodated on a carriage 5, which can be moved vertically by means of a vertical movement device (not shown here) on a frame 6 constructed in the manner of a column.
• a vertical movement device is, for. As described in DE 40 15 478 C1, the disclosure of which is hereby incorporated.
• radially outer end portions 7 of the blades 4 are bent in a direction opposite to the main flow direction indicated by the second arrows P2.
• the aforementioned horizontal main flow direction P2 extends substantially parallel to the likewise horizontally extending axis of rotation of the propeller 2.
• a bending angle ⁇ with respect to a radial plane R is approximately 55 ° here.
• the bending angle ⁇ can also be larger or smaller and preferably in a range between 30 and 90 °.
• the end portions 7 have a length which corresponds to at most one fifth of the radius of the blades 4.
• the end sections 7 extend only over a tenth of the radial length of the blades 4.
• end portions 7 have an opposite direction of rotation of the rotor 2 indicated by the arrows Pl curvature.
• the proposed curvature counteracts trapping of braid-forming contaminants.
• Figs. 9 to 12 show a third horizontal agitator in which the propeller 2 is formed as in the second horizontal agitator.
• the propeller 2 in turn has bent end sections 7.
• third horizontal agitator are downstream of the propeller 2 in a plane extending through the axis of rotation of the propeller 2
• axial plane extending plate-shaped flow guide elements 8 are provided.
• the flow guiding elements 8 are attached to the columnar frame 6 in the embodiment shown. Of course, it is also possible to attach the flow guide elements 8 on the submersible motor 1 or on the carriage 5.
• the flow guide elements 8 extend from the submersible motor 1 in the radial direction to a first radius R 1, which is greater than or equal to a second radius R 2 of the propeller 2.
• the first radius R1 may preferably be 1.0 to 1.3 times the second radius R2.
• leading edges 9 are inclined relative to the radial plane R.
• An inclination angle Y opens radially outwards and is preferably 5 to 25 °.
• a curved leading edge 9 can be provided, the curvature of which is directed in the main flow direction P2.
• a drive device may be provided, which in addition to the submersible motor 1 comprises a transmission.
• Figs. 13 to 17 are views of a fourth horizontal agitator.
• the blades 4 of the propeller 2 are made of a composite material in which fibers are accommodated in a plastic matrix.
• the elasticity of the blades 4 is set so that, in particular, an outer portion A elastically deforms under the influence of a fluid pressure.
• suitable netes material design is the elastic deformation so that a Profilanstellwinkel the outer portion A relative to the perpendicular through the axis of rotation extending radial plane R with increasing fluid pressure is greater.
• an outer section A of the blades 4 winds with increasing fluid pressure or with increasing rotational speed.
• a first angle of attack ⁇ 1 represents the shape of the blades at a low speed
• a second angle of attack ⁇ 2 the shape of the blades at a medium speed
• a third angle of attack ⁇ 3 at a high speed again.
• different fibers for example carbon and / or aramid and / or highly drawn polyethylene fibers, can be combined with one another.
• the desired elastic properties can also be influenced by the orientation and the number of fiber layers and by the thickness of the profile.
• the propeller as a whole has a weight which corresponds to the volume of water or wastewater displaced by its volume. Ie.
• the propeller is so heavy that it does not buoy in the submerged state.
• the composite material can be provided with metallic particles or metallic inserts, which are made of lead, for example. LIST OF REFERENCE NUMBERS

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Microbiology (AREA)
• Organic Chemistry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Mixers Of The Rotary Stirring Type (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

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ID=39415107

Family Applications (1)

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Cited By (3)

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Citations (4)

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• 2007
  • 2007-02-19 DE DE102007008134A patent/DE102007008134A1/de not_active Ceased
• 2008
  • 2008-02-14 DK DK08715766T patent/DK2125179T3/da active
  • 2008-02-14 EP EP20080715766 patent/EP2125179B1/de active Active
  • 2008-02-14 CN CN2008800054485A patent/CN101616728B/zh active Active
  • 2008-02-14 AT AT08715766T patent/ATE494950T1/de active
  • 2008-02-14 ES ES08715766T patent/ES2358630T3/es active Active
  • 2008-02-14 PL PL08715766T patent/PL2125179T3/pl unknown
  • 2008-02-14 JP JP2009550233A patent/JP2010519021A/ja active Pending
  • 2008-02-14 US US12/449,325 patent/US8210738B2/en active Active
  • 2008-02-14 DE DE200850002285 patent/DE502008002285D1/de active Active
  • 2008-02-14 WO PCT/EP2008/001128 patent/WO2008101632A1/de not_active Ceased

Patent Citations (4)

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