EP2659985B2 - Vollmantelschneckenzentrifuge mit einer Wehrkante - Google Patents

Vollmantelschneckenzentrifuge mit einer Wehrkante Download PDF

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Publication number
EP2659985B2
EP2659985B2 EP13178930.7A EP13178930A EP2659985B2 EP 2659985 B2 EP2659985 B2 EP 2659985B2 EP 13178930 A EP13178930 A EP 13178930A EP 2659985 B2 EP2659985 B2 EP 2659985B2
Authority
EP
European Patent Office
Prior art keywords
outlet channel
width
centrifuge drum
centrifuge
outlet
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
EP13178930.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2659985B1 (de
EP2659985A1 (de
Inventor
Manfred Schlarb
Benno Vielhuber
Wieland Zaglauer
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.)
Flottweg SE
Original Assignee
Flottweg SE
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Publication date
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Application filed by Flottweg SE filed Critical Flottweg SE
Priority to EP13178930.7A priority Critical patent/EP2659985B2/de
Priority to DK13178930.7T priority patent/DK2659985T4/da
Publication of EP2659985A1 publication Critical patent/EP2659985A1/de
Publication of EP2659985B1 publication Critical patent/EP2659985B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2075—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with means for recovering the energy of the outflowing liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the invention relates to a solid bowl screw centrifuge with a rotatable about a longitudinal axis of the centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good and a discharge passage for discharging the total omitted good, wherein the weir edge on the The outlet channel is designed in the flow direction behind the weir edge, the outlet channel is curved to divert the outflow Good in a substantially tangential direction, the outlet channel in the longitudinal direction of the centrifuge drum considered a first width and viewed in the radial direction a second width and the second width is smaller than the first width is designed.
  • Such a solid bowl screw centrifuge is particularly in post-published WO 2012/089492 A1 described.
  • the invention is based on the object To provide Vollmantelschneckenzentrifuge, in which the energy recovery due to a pulse return of the outflowing Guts is provided particularly cost effective and at the same time particularly effective.
  • a solid bowl screw centrifuge with a rotatable about a longitudinal axis centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good edge and an outlet channel for discharging the entire omitted good
  • said Weir edge is arranged on the front side of the centrifuge drum and the outlet channel extends in particular outside, in the flow direction behind the weir edge, the outlet channel is curved to redirect the effluent in a substantially tangential direction
  • the outlet channel in the longitudinal direction of the centrifuge drum viewed a first width and viewed in the radial direction having a second width and the second width is designed smaller than the first width, wherein the outlet channel, starting from the outlet opening to that end of the outlet channel, at the discharged material is discharged, viewed in the outlet direction is designed to be continuously tapered in terms of its width.
  • the outlet device is provided for discharging clarified Good from a centrifuge drum on the front side of the centrifuge drum and attached there an associated outlet opening partially overlapping stationary or adjustable.
  • the outlet device comprises a weir with a weir edge and an outlet channel arranged outside the weir for discharging the entire discharged material.
  • the outlet opening is flowed through by the then axially outflowing material which flows out over the weir edge aligned there in the radial direction, that is to say transversely to the longitudinal axis.
  • the weir edge is in particular curved and widely spaced from the longitudinal axis of a first radius.
  • the downstream in the flow direction outlet channel is curved to redirect the outflowing Good in the substantially tangential direction.
  • the outlet channel is preferably designed with a bottom surface over which the material flows out. This bottom surface is preferably at least partially spaced from the longitudinal axis, as the first radius is.
  • a weir is provided on the front side, which has its weir edge in the radial plane of the front side, as in conventional weirs.
  • the weir thus arranged leads to a particularly accurate control of the material level within the centrifuge drum.
  • such a weir has only a low tendency to clog and is also very inexpensive in terms of its production.
  • It may be provided in the design of conventional weirs optionally with a particularly wear-resistant designed weir edge.
  • the device according to the invention can therefore also be installed particularly well in replacement of existing systems.
  • the bottom surface is preferably at least partially radially outward, as the weir edge.
  • the outlet channel according to the invention thus achieves two effects: It allows the controlled overflow of the weir edge in a radial direction with only slight turbulence, low imbalance risk and low risk of clogging. At the same time, the outlet channel directs the effluent material in the desired direction, in order to recover a high level of energy from the effluent.
  • the outlet channel according to the invention has a first width when viewed in the longitudinal direction and a second width when viewed in the radial direction, the second width being smaller than the first width.
  • the outlet channel tapers from the outlet openings in the flow direction up to that end of the Outlet channel, where the effluent is discharged largely in the tangential direction, with a steady taper. The rejuvenation brings a steady increase in the speed of the flow and thus the kinetic energy of the outflowing material with it.
  • the bottom surface of such outlet channel is particularly advantageous at least partially flat or designed largely flat.
  • Such a bottom surface can be manufactured inexpensively.
  • the material flowing therefrom over a longer distance undergoes a uniform and thus comparatively easy model-technically comprehensible acceleration.
  • the acceleration leads to an increased conversion of the centrifugal force pulse into a tangentially directed motion pulse. It is converted into tangential drive energy as a particularly large proportion of the centrifugal force energy.
  • the plane section of the bottom surface is inclined to the tangential direction by an angle of 8 ° to 28 °, preferably 18 °, radially inwards.
  • the bottom of the outlet channel according to the invention is designed so that its plane or substantially flat portion starts at an angle of 3.5 °, counter to the direction of rotation of the centrifuge drum, starting from the outlet opening center.
  • the thus flat or substantially flat section begins at the outlet opening only a predefined piece behind the Auslassö Stammsmitte.
  • the acceleration of the outgoing material achieved according to the invention thus likewise begins only further back in the outlet channel.
  • the suction obtained with the acceleration thus likewise arises comparatively far back in the outlet channel, as a result of which an overall speed-increasing increase in speed is to be found in the outlet channel. This suction effect reduces the risk of clogging and at the same time increases the kinetic energy in the tangential direction.
  • the plane section of the bottom surface viewed counter to the direction of rotation of the centrifuge drum, ends at an angle of 15 ° to 30 °, preferably 21.5 °, viewed from the outlet opening center.
  • the planar section of this type has a particularly advantageous length, which has proved to be very effective even with different outlet diameters and drum sizes.
  • a curved section in particular an arcuate section of the bottom surface, adjoins the flat section of the bottom surface.
  • a curved section can be produced inexpensively in terms of production and leads to a flow which is not radially changed over a certain angular range and thus also radially not accelerated or decelerated.
  • Such a flow has proven to be particularly advantageous over a certain portion of the circumferential direction.
  • This bottom surface leads to a largely turbulence-free overflow at the weir edge and thus to low imbalance development at the multiple, distributed over the circumference of the centrifuge drum and each overflowed by effluent Weirs.
  • the outlet channel is designed to be continuously tapering in terms of its width.
  • the acceleration is then largely turbulence-free under simultaneously deliberately directed flow through the outlet openings and the subsequent outlet channels.
  • the such outlet channel is preferably designed to be open radially inward.
  • the outlet channel is thus in contrast to known solutions of the prior art, in which the outflowing material is discharged through one or more tubes in the tangential direction.
  • the invention according to the invention radially inwardly open channel is not only cheaper to produce, but also has less overall the risk of clogging. Furthermore, such a channel can be easily cleaned during maintenance because it is more accessible.
  • the weir edge and the outlet channel of the invention Solid bowl screw centrifuge are preferably designed with a component or in one piece or in one piece, wherein the component is particularly advantageous from the outside on the front side of the centrifuge drum attachable and removable from there.
  • the component is then easily retrofitted depending on the purpose of the centrifuge and can also be easily changed in case of maintenance.
  • the position of the weir cate can be adjusted well. With the adjustment of the weir edge changes in an advantageous manner at the same time the location of the associated outlet channel, without the need for further complicated adjustment or alignment work.
  • Fig. 1 the end face of a centrifuge drum 10 is shown, which accommodates a centrifuge screw (not shown) in its interior according to the conventional design of a solid bowl screw centrifuge.
  • the centrifuge drum 10 is rotatable about a longitudinal axis 12 at high speed in a direction of rotation 14.
  • outlet openings 16 are arranged uniformly spaced over a circle around the longitudinal axis 12.
  • the outlet openings 16 are used for discharging or discharging clarified (not shown) Good from the centrifuge drum 10th
  • each outlet device 18 is attached to the outside of the front side of the centrifuge drum 10.
  • Each outlet device 18 is formed as a one-piece component from a weir plate 20 and an outlet channel 22.
  • the single weir plate 20 extends in each case radial direction, that is transverse to the longitudinal axis 12 and is fixed by means of two screws 24 and thereby slightly adjustable in position adjustable attached to the front page.
  • a weir edge 26 is formed, which is curved and spaced from the longitudinal axis 12 by a radius 28. The outflowing good must overflow this weir edge 26, whereby the crop level in the centrifuge drum 10 is selectively adjustable depending on the desired clarifying power.
  • the associated outlet channel 22 is arranged on the outside of each of the weir plates 20, which has been produced in one piece with the weir plate 20 by means of a milling process.
  • the outlet channel 22 receives the entire over the weir edge 26 flowing Good and thus serves to discharge the entire discharged from the respective outlet opening 16 Good.
  • the outlet channel 22 following in the flow direction of the weir edge 26 has a substantially rectangular cross section and in this case has a bottom surface 30.
  • the bottom surface comprises a curved section 32, which starts at the beginning of the outlet opening 16 along the weir edge 20 (ie in the circumferential direction) counter to the direction of rotation 14 and ends at an angle 34 of 3.5 ° behind the center of the outlet opening 16.
  • the curved portion 32 is designed curved according to the lateral surface of a circular cylinder with the radius 28.
  • a planar section 36 of the bottom surface 30 adjoins the curved section 32.
  • This section 36 extends from the angle 34, starting at an angle 38 of 21.6 °.
  • the flat portion 36 is inclined to the tangential direction by an angle 40 of 18 ° radially inwardly.
  • the planar portion 36 is therefore spaced further from the longitudinal axis 12 than the radius 28 is.
  • the acceleration leads to an increased conversion of the centrifugal force of the outflowing Guts in a tangentially directed motion pulse. Since in particular the entire amount of material flows through the outlet channel 22, a particularly large proportion of the centrifugal force energy the outflowing Guts in tangential drive energy for the rotational movement of the centrifuge drum 10 converted.
  • This acceleration effect in the outlet channel 22 is supported by a continuous taper of the outlet channel 22 in the flow direction of the Guts, ie in the tangential direction.
  • This taper is formed by the fact that the outlet channel 22, starting from a first width 42 for the incoming material, ie viewed in the longitudinal direction of the centrifuge drum 10, proceeding to a second width 44 for the outflowing Good, ie in the tangential or radial direction considered, rejuvenated.
  • the widths 42 and 44 are defined by two side walls 46 and 48 of the outlet channel 22, which are correspondingly curved from the longitudinal direction to the tangential direction.
  • such an outlet channel 22 is designed with a radially inwardly completely open area 50.
  • This area 50 allows a free adjustment of the product level in the outlet channel 22. Since the material can thus flow freely through the outlet channel 22, no blockages can result and the product level at the associated weir edge 26 can be free depending on the product level in the centrifuge drum 10 to adjust.
  • weir plates 20 and the there radially aligned weir edges 26 not least a particularly accurate control of the product level within the centrifuge drum 10 is possible even under highly fluctuating operating conditions.
  • the crop flows After flowing over the radially directed weir edges 26, the crop flows are thus each redirected so that they due to their flow through the outlet channel 22 when leaving the outlet 16 a in the range of 8 ° to 28 °, preferably a 18 ° from the tangential radially to have inside swung motion pulse.
  • the movement impulse thus directed has proved to be particularly advantageous with regard to the energy recycling thus produced in the centrifuge drum 10.

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  • Centrifugal Separators (AREA)
EP13178930.7A 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante Active EP2659985B2 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13178930.7A EP2659985B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante
DK13178930.7T DK2659985T4 (da) 2011-07-29 2011-07-29 Fuldkappe-snekkecentrifuge med overløbskant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13178930.7A EP2659985B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante
EP11006261.9A EP2551019B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP11006261.9A Division-Into EP2551019B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante
EP11006261.9A Division EP2551019B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante
EP11006261.9 Division 2011-07-29

Publications (3)

Publication Number Publication Date
EP2659985A1 EP2659985A1 (de) 2013-11-06
EP2659985B1 EP2659985B1 (de) 2016-09-14
EP2659985B2 true EP2659985B2 (de) 2019-11-06

Family

ID=45044247

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13178930.7A Active EP2659985B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante
EP11006261.9A Active EP2551019B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11006261.9A Active EP2551019B2 (de) 2011-07-29 2011-07-29 Vollmantelschneckenzentrifuge mit einer Wehrkante

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EP (2) EP2659985B2 (da)
DK (2) DK2551019T4 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019418A2 (en) 2008-08-15 2010-02-18 M-I Llc Centrifuge
EP2789395B2 (de) 2013-04-08 2019-11-06 Flottweg SE Vollmantelschneckenzentrifuge mit einer Energierückgewinnungseinrichtung
DE102014108722A1 (de) 2014-04-30 2015-11-05 Hiller Gmbh Schneckenzentrifuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11179236A (ja) † 1997-12-22 1999-07-06 Kubota Corp 横型遠心分離機における分離水の排出装置
JPH11197547A (ja) † 1998-01-13 1999-07-27 Kubota Corp 横型遠心分離機における分離水の排出装置
WO2008138345A1 (en) † 2007-05-09 2008-11-20 Alfa Laval Corporate Ab A centrifugal separator and a liquid phase discharge port member
WO2010076750A1 (en) † 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3112585A1 (de) 1981-03-30 1982-10-14 Buckau-Walther AG, 4048 Grevenbroich Verfahren und vorrichtung zum trennen eines zweistoffgemisches
US20040072668A1 (en) 2002-10-15 2004-04-15 Baker Hughes Incorporated Liquid phase discharge port incorporating chamber nozzle device for centrifuge
US7022061B2 (en) 2002-10-15 2006-04-04 Andritz Ag Centrifuge discharge port with power recovery
DE102010061563A1 (de) † 2010-12-27 2012-06-28 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge mit Überlaufwehr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11179236A (ja) † 1997-12-22 1999-07-06 Kubota Corp 横型遠心分離機における分離水の排出装置
JPH11197547A (ja) † 1998-01-13 1999-07-27 Kubota Corp 横型遠心分離機における分離水の排出装置
WO2008138345A1 (en) † 2007-05-09 2008-11-20 Alfa Laval Corporate Ab A centrifugal separator and a liquid phase discharge port member
WO2010076750A1 (en) † 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body

Also Published As

Publication number Publication date
EP2551019B2 (de) 2019-11-06
EP2659985B1 (de) 2016-09-14
DK2551019T4 (da) 2020-02-03
EP2551019B1 (de) 2016-09-14
DK2659985T4 (da) 2020-02-03
EP2659985A1 (de) 2013-11-06
EP2551019A1 (de) 2013-01-30
DK2551019T3 (da) 2016-12-12
DK2659985T3 (da) 2016-12-19

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