EP1474241A1 - Centrifugeuse a vis a bol plein comprenant un deversoir - Google Patents

Centrifugeuse a vis a bol plein comprenant un deversoir

Info

Publication number
EP1474241A1
EP1474241A1 EP03704471A EP03704471A EP1474241A1 EP 1474241 A1 EP1474241 A1 EP 1474241A1 EP 03704471 A EP03704471 A EP 03704471A EP 03704471 A EP03704471 A EP 03704471A EP 1474241 A1 EP1474241 A1 EP 1474241A1
Authority
EP
European Patent Office
Prior art keywords
drum
nozzles
solid bowl
screw centrifuge
bowl screw
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.)
Withdrawn
Application number
EP03704471A
Other languages
German (de)
English (en)
Inventor
Paul BRÜNING
Jürgen HERMELER
Helmut Figgener
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.)
GEA Mechanical Equipment GmbH
Original Assignee
Westfalia Separator GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westfalia Separator GmbH filed Critical Westfalia Separator GmbH
Publication of EP1474241A1 publication Critical patent/EP1474241A1/fr
Withdrawn legal-status Critical Current

Links

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 according to the preamble of claim 1.
  • a weir which has a passage which can be formed by a plurality of grooves extending from the inside diameter of the weir or by openings provided in the walls of the weir.
  • a throttle disc which is stationary relative to this while the drum is rotating and which is axially displaceable via a threaded bushing.
  • the distance between the weir and the throttle plate can be changed by turning the threaded bushing. This changes the discharge cross-section for the liquid running out of the centrifugal drum, which is composed of the total length of the transition edge of the passage and the distance between the weir and the throttle disc.
  • the change in the discharge cross-section causes a change in the liquid level in the centrifugal drum, so that this can be adjusted continuously
  • Liquid level is possible by moving the throttle plate.
  • the throttle plate can also be displaced in the axial direction in that the throttle plate is articulated and pivoted on its outer circumference, which in the area of the weir leads to an axial displacement between the throttle plate and the weir.
  • DE 43 20 265 AI has proven itself since it offers a solution to the problem with the construction of DE 41 32 029 AI that the devices for adjusting the transfer diameter on the weir rotate with the drum during operation , which makes a relatively complex and laborious transfer of actuating forces to the rotating centrifugal drum necessary.
  • the object of the invention is to solve this problem.
  • the passage is also assigned at least one nozzle or several nozzles rotating with the drum for discharging / discharging the clarified liquid.
  • the invention offers the possibility of deriving a fixed basic quantity from the drum through the nozzles and additionally using the variable throttle device, in particular the throttling disk, to finely regulate or fine-tune the liquid level in the solid bowl screw centrifuge ,
  • nozzles on solid-bowl screw centrifuges and their effect of saving energy with an appropriate orientation inclined to the drum axis are known per se, for example from DE 39 004 151 A1.
  • the throttle device is used to regulate the liquid level in the centrifuge. With increasing flow resistance at the gap through which the liquid exits the throttle device, a greater liquid pressure at the passage is required, which leads to an increase in the
  • the nozzles are particularly advantageously designed to be exchangeable in order to be able to easily preset the amount of liquid that runs off, e.g. with strongly varying throughput quantities. Another advantage of this measure can be seen in the fact that changing the nozzles against others with a different diameter provides a simple further possibility for changing the control and setting characteristics. "Nozzles" with blind bores (closed bores) can also be set, as a result of which the number of nozzles and the characteristics can also be changed.
  • the nozzles are preferably connected downstream of the passage and the throttle device is in turn connected downstream of the nozzles.
  • the nozzle chamber preferably also has a diameter which corresponds to the diameter at the outer edge of the passage. This ensures very favorable flow conditions in the nozzle chamber, which largely or completely prevent the accumulation of dirt. In this variant in particular, clearing elements are no longer required in the nozzle chamber.
  • the nozzles have a diameter of more than 2 mm. It is in particular possible to provide the nozzles with such a large diameter if they are arranged offset radially inwards relative to the outer drum shell, and particularly preferably such that the nozzles are at a distance from the outer drum radius in a plane perpendicular to the drum axis Have 25 to 75% of the drum radius.
  • the nozzles can basically only be designed so that blockages are reliably avoided. This was not recognized in the prior art. For this reason, too, the nozzles have not become particularly popular in practice.
  • Another advantage of the measure of arranging the nozzles further inward toward the axis of rotation is that it is possible to change the annular chamber provided according to DE 43 20 265 AI - called an annular channel there - in such a way that the annular chamber there
  • Ring channel arranged and provided broaching tools that are necessary to avoid the accumulation of dirt can be saved.
  • Liquid from the solid bowl screw centrifuge should be mentioned as a further advantage that, with appropriate alignment of the openings of the nozzles inclined to the axis of symmetry, the liquid emerging from the nozzles reduces the drive power and energy to be applied of the solid bowl screw centrifuge. This Energy saving is not insignificant and can lead to a noticeable reduction in the energy consumption of the solid bowl screw centrifuge.
  • the openings of the nozzles are preferably oriented backwards in relation to the direction of rotation of the drum in order to save energy.
  • the openings of the nozzles are preferably oriented in relation to a tangent in a plane perpendicular to the drum axis of rotation on the drum surface such that they have an inclination between 0 ° and 30 °.
  • An inclination of 0 ° brings maximum energy gain. Values greater than 0 ° and less than 30 ° can be implemented constructively.
  • the energy gain is particularly great in solid-bowl screw centrifuges with such a design that the peripheral speed of the drum on the outer diameter of the drum during operation is more than 70 m / s, since the energy gain has a particularly significant effect in such centrifuges.
  • FIG. 1 shows the area of the weir of a solid bowl screw centrifuge according to the invention
  • Fig. 2 is a schematic view of a known solid bowl screw centrifuge with a weir designed as an overflow
  • FIGS. 3, 4 are diagrams for illustrating effects of the prior art and the invention.
  • Fig. 2 is intended to illustrate the basic structure of a solid bowl screw centrifuge.
  • FIG. 2 shows a solid-bowl screw centrifuge 1 with a drum 3, in which a screw 5 is arranged.
  • the drum 3 and the screw 5 each have an essentially cylindrical section and a section which tapers conically here.
  • An axially extending central inlet pipe 7 is used to feed the centrifuged material via a distributor 9 into the centrifugal chamber 11 between the
  • the screw 5 rotates at a somewhat lower or greater speed than the drum 3 and conveys the ejected solid to the conical section from the drum 3 to the solids discharge 13.
  • the liquid flows to the larger drum diameter at the rear end of the cylindrical section of the drum 3 and is derived there by or over a weir 15.
  • the weir 15 has a passage 17 in an axial cover 19 of the drum 3, to which a combination of at least one or more nozzles 21 and an adjustable throttle device is assigned - here connected downstream.
  • the nozzles 21 are designed as screw bodies inserted into openings 23 of a stepped ring extension 25 that are configured in radial or inclined directions with respect to the drum axis, the bores or openings 27 of which are oriented perpendicular or at an angle to the drum axis S of the drum.
  • the ring extension 25 has an inner diameter which corresponds to the outer diameter of the passage 17.
  • the nozzle chamber 33 thus also has a diameter which corresponds to the diameter at the outer edge of the passage 17.
  • the inlet openings 27 of the nozzles are preferably flush with the diameter of the overflow-like passage 17. This prevents dirt from accumulating in the nozzle chamber 33.
  • the ring extension 25 forms at its end facing away from the passage 21 an axial outlet 29, which is followed by the throttle disc 31, the distance to the outlet 29, for example in the manner described in DE 43 20 265 AI, with a wide variety of drive devices (here not shown) is changeable.
  • the distance of the throttle disc 31 to the outlet 29 is preferably changed by axial movement, in particular by axial displacement (which can also be achieved by pivoting) of the throttle disc 31 which is stationary relative to the rotating drum 3.
  • axial displacement which can also be achieved by pivoting
  • the throttle disc 31 rotates with the drum 3 during operation (not shown).
  • this solution is structurally more complex than the non-rotating variant.
  • the term nozzle 21 is to be understood here in such a way that the bore 27 can have a diameter which is constant or variable over the axial extent of the opening.
  • the nozzle 21 can also be designed as a bore in the ring extension 25, but the screw bodies offer the advantage of being interchangeable and thus of presetting the discharge quantity.
  • ribs (not shown here) can improve the delivery.
  • a preset basic quantity of liquid is derived from the drum 3 through the nozzles 21, depending on the design and diameter of the openings of the exchangeable screw body.
  • the optimal alignment of the nozzles 21 for maximum energy savings can be determined with simple experiments.
  • the amount of solids is, for example, 20 m 3 / h. With this quantity, a nozzle design for 110 m / h and, in turn, a discharge of 70 m / h for regulating the mirror via the throttle disk 31 would be recommended.
  • the nozzles 21 are simply exchanged for those with a different diameter. A complex exchange of expensive and complicated components is not necessary.
  • the nozzles 21 are preferably arranged in a plane perpendicular to the drum axis at a distance from the outer drum radius or circumference of 25 to 75% of the drum radius, since the energy gain is greater the closer the nozzles 21 come to the drum circumference, but one Arranging further inwards offers the advantage that the diameter of the nozzles or their opening cross section can be larger than in the case of an arrangement further out, so that they clog less quickly.
  • the area mentioned represents a good compromise between the effects mentioned.
  • a change in the discharge cross-section brings about a change in the liquid level in the drum 3 by adjusting the distance between the throttle disk 31 and the outlet 29.
  • the liquid level FS in the solid-bowl screw centrifuge is used in particular fine-tuned.
  • This formula is used to calculate a significant reduction in power consumption at a nozzle inclination angle between 0 and 30 °.
  • A depends on the diameter and the cross-sectional shape of the nozzle 21, the level of the mirror in the drum and the beam angle of the nozzle jet.
  • the cross-sectional geometry of the nozzles 21 can be designed as desired, e.g. round or square or in some other way.
  • Fig. 3 shows the conditions in a construction of the type of DE 43 20 265 AI without nozzles.
  • the gap width s between the throttle plate 31 and drum weir outlet 17 is plotted on the X axis, and the volume flow VX is plotted on the Y axis.
  • a volume flow V1X thus results for a gap width X.
  • the larger the gap width S the larger the volume flow , which is derived between the throttle plate 31 and the drum weir 17 from the drum 3.
  • the volume flow becomes smaller, the narrower the gap between throttle plate 31 and drum weir is set.
  • the pond depth increases within the decanter drum, i.e. the surface level moves further inwards as the gap decreases.
  • FIG. 4 shows the behavior of the volume flow V at the nozzles 21.
  • the volume flow increases with increasing pond depth due to the pressure in the liquid at the nozzle inlet. Both effects overlap. In practice, this extends the control range on the decanter according to the type of FIG. 1 up to double compared to a decanter without nozzles 21 according to the type of FIG. 3. LIST OF REFERENCE NUMBERS

Landscapes

  • Centrifugal Separators (AREA)

Abstract

L'invention concerne une centrifugeuse à vis à bol plein comprenant au moins un déversoir (15) servant à évacuer un liquide clarifié d'un tambour (3). Ce déversoir (15) comporte un passage (17) auquel est associé un dispositif d'étranglement, en particulier un écran d'étranglement (31), la distance entre cet écran et le passage (17) pouvant être modifiée. Pendant le fonctionnement de la centrifugeuse, cet écran d'étranglement (31) est statique par rapport au tambour (3). Cette centrifugeuse se caractérise en ce qu'au moins une buse (21) solidaire en rotation avec le tambour (3) est également associée au passage (17) pour l'évacuation du liquide clarifié.
EP03704471A 2002-01-30 2003-01-27 Centrifugeuse a vis a bol plein comprenant un deversoir Withdrawn EP1474241A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10203652A DE10203652B4 (de) 2002-01-30 2002-01-30 Vollmantel-Schneckenzentrifuge mit einem Wehr
DE10203652 2002-01-30
PCT/EP2003/000776 WO2003064054A1 (fr) 2002-01-30 2003-01-27 Centrifugeuse a vis a bol plein comprenant un deversoir

Publications (1)

Publication Number Publication Date
EP1474241A1 true EP1474241A1 (fr) 2004-11-10

Family

ID=27588149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03704471A Withdrawn EP1474241A1 (fr) 2002-01-30 2003-01-27 Centrifugeuse a vis a bol plein comprenant un deversoir

Country Status (7)

Country Link
US (1) US7326169B2 (fr)
EP (1) EP1474241A1 (fr)
KR (1) KR100857950B1 (fr)
CN (1) CN100337754C (fr)
CA (1) CA2473640C (fr)
DE (1) DE10203652B4 (fr)
WO (1) WO2003064054A1 (fr)

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Also Published As

Publication number Publication date
CA2473640C (fr) 2010-08-17
KR20040098635A (ko) 2004-11-20
WO2003064054A1 (fr) 2003-08-07
CA2473640A1 (fr) 2003-08-07
US20050164861A1 (en) 2005-07-28
CN1691985A (zh) 2005-11-02
DE10203652A1 (de) 2003-08-14
DE10203652B4 (de) 2006-10-19
US7326169B2 (en) 2008-02-05
CN100337754C (zh) 2007-09-19
KR100857950B1 (ko) 2008-09-09

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