EP1981643A1 - Essoreuse centrifuge a vis et enveloppe complete et son procede d'utilisation - Google Patents

Essoreuse centrifuge a vis et enveloppe complete et son procede d'utilisation

Info

Publication number
EP1981643A1
EP1981643A1 EP07704430A EP07704430A EP1981643A1 EP 1981643 A1 EP1981643 A1 EP 1981643A1 EP 07704430 A EP07704430 A EP 07704430A EP 07704430 A EP07704430 A EP 07704430A EP 1981643 A1 EP1981643 A1 EP 1981643A1
Authority
EP
European Patent Office
Prior art keywords
drum
separation space
discharge
screw
space
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Withdrawn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
EP07704430A
Other languages
German (de)
English (en)
Inventor
Ulrich Horbach
Tore Hartmann
Knud SCHÖNEBERG
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 EP1981643A1 publication Critical patent/EP1981643A1/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Withdrawn legal-status Critical Current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
    • B04B2001/2041—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 baffles, plates, vanes or discs attached to the conveying screw
    • 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 and a method for its operation.
  • a solid bowl centrifuge - also called a decanter - is provided with a rotatable drum which has a cylindrical and a tapered, usually conical, section.
  • a screw is arranged, which rotates in operation at a differential speed relative to the drum.
  • Such a construction shows e.g. DE 43 20 265 A1.
  • the distance between a weir for remplisstechniksaustrag and a throttle plate can be changed.
  • the concomitant change in the discharge cross section causes a change in the liquid level in the centrifugal drum, so that a stepless adjustment of this liquid level by moving the throttle plate is possible.
  • the mechanical conveyance through the screw is based essentially on the transmission of power by the internal friction.
  • the extent to which mechanical promotion is possible therefore depends on the theological properties of the solid mass.
  • Fig. 2 schematically illustrates the shearing motion in a solid as a function of an applied shear stress.
  • One of the curves describes a purely Newtonian behavior in which a constant ratio between shear stress and shear rate (viscosity) is given over the entire considered range. Deviating from this, the other curve shown, for example, a basic thrust, which must first be exceeded before a Shearing movement begins. The higher the viscosity of a substance, the better it can be mechanically challenged. On the other hand, difficulties occur in the solids discharge when the phase to be discharged is particularly low in viscosity.
  • the invention is particularly suitable.
  • the invention has the object, in this context, to provide a solid bowl screw centrifuge and a method for operating the solid bowl screw centrifuges, which allow the discharge even relatively low-viscosity solids.
  • the invention also provides a simple method for operating the centrifuge according to the invention. This is specified in claim 14.
  • the separation space i. The space in which the separation or clarification takes place, a pressure superimposed, which deviates from the ambient pressure, depending on this deviation in the conical discharge space will adjust an internal diameter of the solid, because the liquid discharge is so hermetically sealed against the ambient pressure that in interaction with the baffle plate - the inner diameter of the pond in the area of the separation space remains unchanged during a pressure increase in stationary operation.
  • This is not the case in the generic US 3,885,734, because here is the separation space at the liquid discharge in the manner of communicating tubes with the ambient pressure in connection, so that shifts in pressure increase the liquid level in the separation chamber, with the result that the solids discharge is not permanent in Operation is improved.
  • the sealing of the liquid discharge takes place via a paring disc or via another seal - for example a hydro-thermal chamber, which is designed such that the pressure drop does not lead to a mirror displacement in the separation space.
  • the device for acting on the separation space with a gas on a supply line into the separation space which opens in operation at a radius in the separation space, which is smaller than the radius of the liquid level during operation.
  • the gas may be compressed air (in particular also sterile air) or e.g. to act on nitrogen.
  • the invention is supplemented by an optional measurement of the torque between the drum and screw, which represents a measure of the solids filling level in the decanter.
  • This signal is supplied to the pressure control unit and evaluated and used as a control signal for a target value of the overlay pressure.
  • the differential speed between worm and drum remains constant. This can be dispensed with a secondary drive to change the differential speed. This remains rather constant. The actual control of the process, however, takes place in a simple manner by a variation of the pressure in the separation space.
  • the pressure in the separation space is measured via a further line.
  • the solids discharge quantity is controlled or regulated in a simple manner by means of variation of the pressure in the separation space.
  • Fig. 1 shows a section through a schematically illustrated inventive
  • Fig. 2 is a diagram for illustrating the shear behavior of solid masses.
  • Fig. 1 shows a solid bowl screw centrifuge 1 with a drum 3 with a horizontal axis of rotation D, in which a screw 5 is arranged.
  • the worm also has a substantially cylindrical section 3a and a conically tapering section 3b.
  • An axially extending centric inlet pipe 7 serves to feed the centrifugal material P via a distributor 9, which is perpendicular to the inlet pipe 7, into the centrifugal space 11 between the screw 5 and the drum 3, wherein the distributor 9 has a liquid inlet 38 into the centrifugal space 11. If, for example, a muddy slurry is fed into the drum 3, solid particles settle on the drum wall. Further inward, a liquid phase forms.
  • the bearing with the bearing 6 screw 5 rotates at a slightly lower or greater speed than the drum 3 and promotes the ejected solid S to the conical section towards a solids discharge 13th
  • the liquid L flows toward the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is there through a weir
  • the paring disc 19 can be arranged directly on the stationary in operation inlet pipe 7, wherein between peeling disk 19 and inlet pipe 7, for. a sealed gap-free arrangement can be realized.
  • the liquid discharge is thus formed sealed against the ambient pressure.
  • the screw 5 in front of the solids discharge 13 on a plunger 23, extending from the screw 5 radially outwardly into the
  • Centrifugal space 11 extends and immersed in the liquid level Rl.
  • the plunger 23 is suitably mounted axially on the solids end of the cylindrical portion of the drum. It separates the entire drum space into a separation space 25 between the liquid discharge (Peeling disk 19) and the immersion disk 11 and a discharge space 27 between the solids discharge 13 and the immersion disk 11.
  • the exchange disc 23 can also be mounted in the conical section. It is essential that they are between the solids discharge 13 and the liquid feed
  • Their diameter or radius should also be greater than the radius R4, to which the solids discharge 13 extends to a maximum extent.
  • the outer contour of the immersion disk 23 forms, with the inner wall of the drum, an annular gap, the so-called plunger gap 29, through which the solid material passes from the separation space 25 to the solids discharge 13.
  • the liquid-side end of the separation chamber 25 is sealed against the environment, which can be realized, for example, by the inner peeling disk 19 with discharge diameter R3 or a hydrohermetic (not shown) to prevent a free gas exchange between the separation chamber 25 and the environment.
  • the separation space 25 in which the separation takes place is hermetically sealed against the surroundings or the surrounding atmosphere.
  • the device for pressurizing the separation space 25 with a gas has a supply line 31 leading from the outside into the centrifuge - here, for example, a bore parallel to the inlet pipe 7 on its outer circumference, which allows the supply of a gas, for example, from a pressure control unit 33 into the separation space 25.
  • Another line 35 allows a measurement of the pressure P in the separation space 25 by means of a suitable measuring device, which may be integrated into the pressure control unit 33.
  • the pressure control unit 33 is in turn connected to a control or regulating device 37 for controlling or regulating the decanter.
  • the supply line 31 allows in the simplest way a variation of the pressure in the separation space 25 of the drum.
  • annular suspension pond is formed.
  • the liquid discharge is thus hermetically sealed against the ambient pressure so that the inner diameter Rl of the pond in the region of the separation space 25 remains unchanged at a pressure increase. It essentially corresponds to the regulatory diameter. In the conical discharge space 27, however, the ambient pressure is given.
  • an internal diameter R2 of the solids phase will be set in dependence on this deviation in the conical discharge space 27. If this inner diameter R2 is smaller than the solids discharge diameter R4 (ie the diameter at which the solids discharge openings are located), a solids discharge also occurs in a very low-viscosity liquid phase.
  • the Konizticianswinkel ⁇ between the longitudinal axis (or approximately the axis of rotation D) of the drum and the conical section 3b is preferably 10 ° to 90 °, preferably more 15 °, in particular more than 30 °.
  • a relatively large conicity angle is therefore advantageous or possible with a conical design, which has the advantage that the drum builds very short axially.
  • 90 ° would from the section conical a very cylindrical drum, which is to be taken as a limiting case with the wording of the claims.

Abstract

L'invention concerne une essoreuse centrifuge à vis et enveloppe complète dotée d'un tambour rotatif (3) qui présente un axe horizontal de rotation et qui entoure une chambre d'essorage (11) qui se rétrécit de préférence au moins dans une partie, une vis (5) disposée dans le tambour (3) et qui peut tourner à une autre vitesse de rotation que le tambour (3), au moins une extraction de liquide (19) étanche vis-à-vis de l'environnement, au moins une extraction de solides (13) disposée de préférence dans la partie du tambour qui se rétrécit et une plaque de poussée (23) sur la vis (5), disposée entre l'amenée de liquide (38) et la sortie de solides (13) et qui divise l'espace intérieur du tambour ou la chambre d'essorage (11) en une chambre d'extraction (27) située entre la plaque de poussée (23) et la sortie de solide et une chambre de séparation (25) située entre la plaque de poussée (23) et l'extraction de liquide (19), ainsi qu'un dispositif (31, 33) qui alimente la chambre de séparation (25) en gaz.
EP07704430A 2006-02-10 2007-02-07 Essoreuse centrifuge a vis et enveloppe complete et son procede d'utilisation Withdrawn EP1981643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006006178A DE102006006178A1 (de) 2006-02-10 2006-02-10 Vollmantel-Schneckenzentrifuge und Verfahren zu deren Betrieb
PCT/EP2007/051175 WO2007090849A1 (fr) 2006-02-10 2007-02-07 Essoreuse centrifuge A vis et enveloppe complete et SON procede D'utilisation

Publications (1)

Publication Number Publication Date
EP1981643A1 true EP1981643A1 (fr) 2008-10-22

Family

ID=37944785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07704430A Withdrawn EP1981643A1 (fr) 2006-02-10 2007-02-07 Essoreuse centrifuge a vis et enveloppe complete et son procede d'utilisation

Country Status (5)

Country Link
US (1) US8444541B2 (fr)
EP (1) EP1981643A1 (fr)
CN (1) CN201510939U (fr)
DE (1) DE102006006178A1 (fr)
WO (1) WO2007090849A1 (fr)

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DE102005027553A1 (de) * 2005-06-14 2006-12-28 Westfalia Separator Ag Drei-Phasen-Vollmantel-Schneckenzentrifuge und Verfahren zur Regelung des Trennprozesses
DE102006006178A1 (de) * 2006-02-10 2007-08-16 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge und Verfahren zu deren Betrieb
WO2009094774A1 (fr) * 2008-01-31 2009-08-06 Pomerleau Daniel G Système et procédé pour améliorer la séparation de solides entraînés à partir d'une solution à l'intérieur d'une centrifugeuse
DE102008062160A1 (de) * 2008-12-13 2010-07-08 Schaeffler Technologies Gmbh & Co. Kg Dekanterzentrifuge
AU2011268438B2 (en) * 2010-06-15 2015-09-10 Robert Havrin Centrifugal liquid separation machine using pressurized air to promote solids transport
JP5260798B2 (ja) * 2010-08-17 2013-08-14 巴工業株式会社 連続給脂装置を備えたデカンタ型遠心分離機
DK201070482A (en) * 2010-11-12 2012-05-13 Alfa Laval Corp Ab A centrifugal separator
CN102921562B (zh) * 2011-08-09 2015-03-11 苏州优耐特机械制造有限公司 一种螺旋卸料离心机
DE102012102478A1 (de) * 2012-03-22 2013-09-26 Hiller Gmbh Vollmantel-Schneckenzentrifuge
CN102824966B (zh) * 2012-07-31 2014-08-13 天圣环保工程（成都）有限公司 一种螺旋推料器及其应用的卧螺离心机
CN103008119A (zh) * 2012-12-03 2013-04-03 常州大学 一种用于果胶分离的卧式离心设备
DK2918345T3 (da) * 2014-03-14 2020-03-16 Andritz Sas Dekantercentrifuge
CN105170342A (zh) * 2015-09-06 2015-12-23 广州金康源环保设备有限公司 一种卧螺离心机
CN107016140B (zh) * 2016-01-28 2020-07-10 中国石油天然气股份有限公司 离心机制造方法及系统
CN105903576A (zh) * 2016-04-07 2016-08-31 安徽普源分离机械制造有限公司 一种环保节能型自来水污泥高效分离系统
EP3320976B1 (fr) * 2016-11-15 2020-12-30 Ferrum Process Systems AG Dispositif d'insertion pour une centrifugeuse décanteuse
CN109046794A (zh) * 2018-08-13 2018-12-21 贵州开磷机电装备工程有限责任公司 一种卧螺机内部的特殊密封装置
CN111001497A (zh) * 2019-12-31 2020-04-14 南京莫尼亚离心机科技发展有限公司 一种浮渣卧螺机

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DE102006006178A1 (de) * 2006-02-10 2007-08-16 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge und Verfahren zu deren Betrieb
WO2009094774A1 (fr) * 2008-01-31 2009-08-06 Pomerleau Daniel G Système et procédé pour améliorer la séparation de solides entraînés à partir d'une solution à l'intérieur d'une centrifugeuse
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Also Published As

Publication number Publication date
US8444541B2 (en) 2013-05-21
WO2007090849A1 (fr) 2007-08-16
DE102006006178A1 (de) 2007-08-16
CN201510939U (zh) 2010-06-23
US20100041535A1 (en) 2010-02-18

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