EP2874753A1 - Solid bowl centrifuge having an energy-recovery device - Google Patents
Solid bowl centrifuge having an energy-recovery deviceInfo
- Publication number
- EP2874753A1 EP2874753A1 EP13731280.7A EP13731280A EP2874753A1 EP 2874753 A1 EP2874753 A1 EP 2874753A1 EP 13731280 A EP13731280 A EP 13731280A EP 2874753 A1 EP2874753 A1 EP 2874753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotation
- centrifuge
- recovery device
- energy recovery
- solid bowl
- 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.)
- Granted
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 54
- 239000007787 solid Substances 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009333 weeding Methods 0.000 description 1
Classifications
-
- 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 centrifuge drum rotatable about a longitudinal axis, at least one outlet for discharging clarified product from the centrifuge drum and an energy recovery device arranged at the outlet for recovering energy from the effluent, clarified product.
- Efforts are known to use the kinetic energy of the outflowing material as possible in such a way that this energy contributes again to drive the rotational movement of the centrifuge drum.
- outlet channels are known, which redirect the flow of material in the tangential direction. The material which then does not exit in the axial direction but in the tangential direction introduces to the centrifuge drum, due to its centrifugal force, an impulse in the direction of rotation of the centrifuge drum in the direction of rotation drives.
- outlet channels are known, for example, from WO 2012 013624 A1.
- the invention has for its object to provide a solid bowl screw centrifuge, in which the energy recovery due to a Impulsruckbowung the outflowing material is provided particularly cost effective and at the same time particularly effective.
- a solid bowl screw centrifuge comprising a rotatable about a longitudinal axis centrifuge drum.
- the centrifuge drum has at least one outlet for discharging clarified product from the centrifuge drum.
- an energy recovery device for recovering energy of the effluent, clarified material is arranged.
- the centrifuge drum can rotate in a first direction of rotation and in a second direction of rotation opposite to the first direction of rotation.
- the energy recovery device has a first effective area over which clarified Good can flow on rotation of the centrifuge drum in the first direction of rotation.
- a second active surface is formed on the energy recovery device, via which good which has been clarified in the second direction of rotation can flow out on rotation of the centrifuge drum.
- an energy recovery device which can be used both in a leading mode of operation of a centrifuge drum as well as a lagging driving style.
- different energy recovery devices had to be used instead for such different drum rotation directions. will see.
- the solution according to the invention therefore makes it easier and more cost-effective to switch between the different operating modes of a solid bowl screw centrifuge.
- the adaptation to the respective mode of operation of the solid bowl screw centrifuge is achieved simply by using different effective surfaces provided there on the energy recovery device according to the invention.
- the two active surfaces are formed with a single shell.
- the shell of this kind which are adapted individually for the respective discharge of effluent, clarified material.
- the partial surfaces have a particularly adapted extension, curvature and / or inclination with respect to the centrifuge drum.
- an outflow edge can be provided on the partial surfaces, over which the outflowing, clarified material finally leaves the energy recovery device.
- a first and a second outflow edge are advantageously provided, which are provided opposite one another on such a shell-shaped or concave overall outflow surface.
- the shell of this type is preferably designed with a radius which is substantially equal to the radius of the material discharged at the outlet.
- the radius of the outflowing, clarified material is also called the pond surface in solid bowl centrifuges.
- This radius is therefore advantageous for the curvature of a concave outflow surface according to the invention, because with such a radius a particularly low-loss overflow results from the centrifuge drum and over the outflow surface.
- the outflow surface can be precisely positioned in front of the outlet and adapted to the respective operating conditions. In particular, an adaptation can be very advantageous. be made to the respective drum speeds and product throughputs on the centrifuge drum.
- the shell is advantageously designed with a radius which is greater than the radius of the material discharged at the outlet. Such a radius inevitably leads to a slipping of discharged material radially outward.
- the energy recovery device of this kind is therefore less sensitive to possibly resulting misadjustments.
- the shell provided according to the invention is advantageously arranged at least slightly tilted with respect to the direction of the tangent at the outlet. Particularly preferably, the angle between the tangents at the outlet with its pond surface and the tangent of the shell positioned there between 5 ° and 20 ° counter to the rotational direction of the centrifuge drum radially outward. Particularly preferred is an angle of 12 °.
- the energy recovery device is particularly preferably designed with surface symmetry. With such an energy recovery device, in the reverse direction of rotation, it can assume the same, and only mirrored, position on the centrifuge drum. Such an energy recovery device is correspondingly easy to reposition between the operating modes.
- the energy recovery device is also advantageous in a first position can be brought, in which the first active surface is in operation, as well as in a second position can be brought, in which the second effective surface is in operation.
- These two positions can be easily set up by rotating the energy recovery on the centrifuge drum.
- a changeover can be provided, so that the energy recovery externally controlled or automatically switches from one direction of rotation in the other direction.
- the outlet is also preferably designed as an outlet opening in a drum end wall of the centrifuge drum, and the energy recovery device can be fixedly attached to the drum end wall in at least two positions symmetrical with respect to the radial direction. With this symmetrical position specification, it is particularly easy to rearrange the energy recovery at the drum end wall.
- the energy recovery device preferably also has a first deflection surface from which, when the centrifuge drum is rotated in the first direction of rotation, clarified material can be deflected from a substantially axial direction of movement into a substantially tangential direction of movement.
- the energy recovery device advantageously has a second deflection surface, from which, upon rotation of the centrifuge drum in the second direction of rotation, cleared material can be deflected from a largely axial movement direction into a largely tangential movement direction.
- Such baffles greatly contribute to the recovery of energy and at the same time make it possible to use the energy recovery device for both leading drum operation and lagging drum operation.
- Such a deflecting surface provided on an energy recovery device is viewed in a longitudinal section of the associated centrifuge drum, preferably at an angle at least partially directed obliquely radially inwards, viewed at an angle to the longitudinal axis of the centrifuge drum.
- the clarified material is not only deflected from the axial direction into the substantially tangential direction when it flows out of the outlet, but it also simultaneously moves axially along the deflection surface from radially outside to radially inside. In this movement from outside to inside, the potential energy of the goods decreases, because it moves radially inward at a lower rotational speed.
- the good thus gives energy to the energy recovery device, which contributes to the acceleration of the centrifuge drum.
- the movement of the goods on the oblique to the longitudinal axis Asked deflection, which may be flat or curved in the axial direction, is a self-regulating process. The greater the energy output, the further the material travels in the axial direction and thereby from radially outside to radially inside.
- the thus provided design of a deflection surface on an energy recovery device in addition to the above-mentioned active surfaces is an independent invention, which alone in combination with only one effective surface is advantageous.
- the invention is accordingly also directed to a solid bowl screw centrifuge comprising a centrifuge drum rotatable about a longitudinal axis, the centrifuge drum having at least one outlet for discharging clarified product from the centrifuge drum to which energy recovery means for recovering energy of the effluent, clarified product is arranged.
- the energy recovery device has at least one deflection surface, which is inclined with respect to the longitudinal axis of the centrifuge drum.
- the angle of inclination is preferably between 5 ° and 45 °, preferably between 10 ° and 20 °, particularly preferably 15 °.
- the two active surfaces and the two deflection surfaces are also preferably formed with a single shell in correspondence with the embodiment mentioned above.
- a weeding device which, together with the energy recovery device, can be brought into at least two positions and in particular is designed in one piece with the energy recovery device.
- the Weehr shark makes it possible that with the positioning of the energy recovery device at the same time in a coordinated manner, a weir edge of the Wehrr boots is placed on the centrifuge drum.
- a weir edge of the weir device can be arranged in two symmetrical positions. net, in which the shell formed according to the invention is also advantageously placed on the energy recovery. In these positions, both the shell and the weir edge is tilted tilted to the associated radial direction.
- the effluent flows principally through a triangular area.
- This triangular area enables the stream of clarified product to be precisely metered by the solid bowl centrifuge, especially at low flow rates.
- the overflow of the weir edge also takes place in a region which allows a long flow path on the above-mentioned effective area for the bypassing and discharging in the tangential direction.
- FIG. 1 is a front view of a first embodiment of an energy recovery device according to the invention
- FIG. 3 is a front view of a second embodiment of an energy recovery device according to the invention.
- FIG. 5 is a front view of a third embodiment of an energy recovery device according to the invention.
- FIG. 7 shows a front view of the energy recovery device according to FIG. 5 in a state mounted on a centrifuge drum for a first direction of rotation
- Fig. 8 is a front view of the energy recovery device of FIG. 5 in a mounted for a second direction of rotation of a centrifuge drum state. Detailed description of the embodiment
- energy recovery devices 10 are shown, which are each provided for placement on a drum end wall or end wall 12 of a Zentrifugentronnnnel not further illustrated.
- end wall 12 a plurality of outlets 14 in the form of a circular outlet opening are formed in a circle around the axis of rotation of the centrifuge drum.
- outlets 14 is shown in the figures.
- the centrifuge drum is rotatable in a first direction of rotation 16 and in a second direction of rotation 18, which is opposite to this first direction of rotation 16.
- the energy recovery device 10 is used to recover energy from discharged from the outlet 14, clarified Good.
- the effluent there has a kinetic energy corresponding to the rotational speed, which largely loses it during the transition to a stationary discharge of the associated centrifuge. This kinetic energy can be partially trapped with the energy recovery device 10 and transferred back to the centrifuge drum, so that for rotation of the centrifuge drum total less rotational energy is applied.
- the energy recovery device 10 comprises a first active surface 20, via which, when the centrifuge drum is rotated in the first direction of rotation 16, clarified material can flow out. Furthermore, a second active surface 22 is formed on the energy recovery device 10, on the clarified on rotation of the centrifuge drum in the second direction of rotation 18 Good.
- the two active surfaces 20 and 22 are both formed with a single shell 24, which protrudes substantially vertically from the end wall 12 of the centrifuge drum immediately before the associated outlet 14 and is fixedly secured.
- the effective surface 20 see FIG. 7
- the outflowing material, starting from the outlet 14 can flow essentially only tangentially and thus slightly radially outward.
- the radial flow path is limited from the center of the outlet 14 to approximately 8 ° radially outward, until the outflowing material flows over a first overflow edge 26 with reference to FIG
- Edge of the shell 24 can finally escape freely radially outward.
- the shell 24 has for this purpose with respect to the axis of rotation of the centrifuge drum to a radius 30, which corresponds to a radius 32 of the discharged at the outlet 14 Good, the so-called pond surface.
- the outflow surface thus formed with the shell 24 and its two active surfaces 20 and 22 can be positioned in a simple manner on the end wall 12 in two positions, a first position 34 (FIG. 7) and a second position 36 (FIG. 8).
- the shell 24 is in each case with respect to a radial direction or radial direction 38 of the associated outlet 14 at an angle of preferably between +/- 2 ° and +/- 20 °, more preferably +/- 10th ° tilted.
- the shell 24 is simply supported by means of a back plate 40 in which two elongated holes 42 are formed for attachment to the end wall 12 by means of unshown screws.
- the shell 24 according to FIGS. 1 and 2 is held perpendicularly by means of the back plate 40 of the end wall 12.
- the shell 24 is designed starting from the outlet 14 to ascend axially outward.
- the shell 24 thus forms a deflection surface for the outflowing, clarified Good, which extends in the longitudinal direction of the centrifuge drum from radially outside obliquely radially inward.
- the shell 24 according to FIGS. 3 and 4 in longitudinal section is flat or straight (in particular not curved), while the shell 24 according to FIGS. 5 and 6 also has a curvature in the axial direction.
- the outflowing material occurs at a trained within the back plate 40 Wehr worn 50 on the shell 24.
- the weir 50 is formed with a weir edge 52 on the back plate 40, which is also advantageously made slightly oblique with the oblique positioning of the back plate 40 depending on the direction of rotation ,
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012014563.2A DE102012014563B4 (en) | 2012-07-23 | 2012-07-23 | Solid bowl screw centrifuge with an energy recovery device |
PCT/DE2013/100183 WO2014015851A1 (en) | 2012-07-23 | 2013-05-16 | Solid bowl centrifuge having an energy-recovery device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2874753A1 true EP2874753A1 (en) | 2015-05-27 |
EP2874753B1 EP2874753B1 (en) | 2016-12-07 |
Family
ID=48698855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13731280.7A Active EP2874753B1 (en) | 2012-07-23 | 2013-05-16 | Solid bowl centrifuge having an energy-recovery device |
Country Status (5)
Country | Link |
---|---|
US (1) | US10105715B2 (en) |
EP (1) | EP2874753B1 (en) |
DE (1) | DE102012014563B4 (en) |
DK (1) | DK2874753T3 (en) |
WO (1) | WO2014015851A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EA017544B1 (en) * | 2008-08-15 | 2013-01-30 | Эм-Ай ЭлЭлСи | Centrifuge |
DE102012106226A1 (en) * | 2012-07-11 | 2014-01-16 | Gea Mechanical Equipment Gmbh | Solid bowl centrifuge with overflow weir |
DE102013001436A1 (en) * | 2013-01-29 | 2014-07-31 | Flottweg Se | Solid bowl centrifuge with a weir edge |
EP2789395B2 (en) * | 2013-04-08 | 2019-11-06 | Flottweg SE | Solid bowl screw centrifuge with an energy recovery device |
DE102014101205B4 (en) * | 2014-01-31 | 2021-08-05 | Flottweg Se | Outlet device of a solid bowl screw centrifuge |
DE102014104296A1 (en) * | 2014-03-27 | 2015-10-01 | Flottweg Se | Outlet device of a solid bowl screw centrifuge |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4764163A (en) * | 1986-07-03 | 1988-08-16 | Pennwalt Corporation | Decanter plate dam assembly with pond adjustment |
US4978331A (en) * | 1989-07-11 | 1990-12-18 | Alfa-Laval Ab | Method and apparatus for cleaning in place of a decanter centrifuge |
US5147277A (en) * | 1991-03-19 | 1992-09-15 | Baker Hughes Incorporated | Power-efficient liquid-solid separating centrifuge |
US7022061B2 (en) | 2002-10-15 | 2006-04-04 | Andritz Ag | Centrifuge discharge port with power recovery |
US20040072668A1 (en) | 2002-10-15 | 2004-04-15 | Baker Hughes Incorporated | Liquid phase discharge port incorporating chamber nozzle device for centrifuge |
JP5009764B2 (en) | 2007-12-06 | 2012-08-22 | 巴工業株式会社 | Horizontal centrifuge and dam forming member |
DE102010032503A1 (en) | 2010-07-28 | 2012-02-02 | Gea Mechanical Equipment Gmbh | Solid bowl centrifuge with overflow weir |
DK178253B1 (en) * | 2010-11-12 | 2015-10-12 | Alfa Laval Corp Ab | A centrifugal separator and an outlet element for a centrifugal separator |
-
2012
- 2012-07-23 DE DE102012014563.2A patent/DE102012014563B4/en active Active
-
2013
- 2013-05-16 WO PCT/DE2013/100183 patent/WO2014015851A1/en active Application Filing
- 2013-05-16 DK DK13731280.7T patent/DK2874753T3/en active
- 2013-05-16 EP EP13731280.7A patent/EP2874753B1/en active Active
- 2013-05-16 US US14/415,827 patent/US10105715B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014015851A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014015851A1 (en) | 2014-01-30 |
DE102012014563B4 (en) | 2014-12-11 |
US20150165450A1 (en) | 2015-06-18 |
EP2874753B1 (en) | 2016-12-07 |
DE102012014563A1 (en) | 2014-01-23 |
US10105715B2 (en) | 2018-10-23 |
DK2874753T3 (en) | 2017-02-20 |
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