EP0466751A1 - Procede pour utiliser un centrifugeur a cisaillement. - Google Patents

Procede pour utiliser un centrifugeur a cisaillement.

Info

Publication number
EP0466751A1
EP0466751A1 EP90905502A EP90905502A EP0466751A1 EP 0466751 A1 EP0466751 A1 EP 0466751A1 EP 90905502 A EP90905502 A EP 90905502A EP 90905502 A EP90905502 A EP 90905502A EP 0466751 A1 EP0466751 A1 EP 0466751A1
Authority
EP
European Patent Office
Prior art keywords
mixture
floor
moving floor
drum
backward movement
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
Application number
EP90905502A
Other languages
German (de)
English (en)
Other versions
EP0466751B1 (fr
Inventor
Werner Dr Stahl
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0466751A1 publication Critical patent/EP0466751A1/fr
Application granted granted Critical
Publication of EP0466751B1 publication Critical patent/EP0466751B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges

Definitions

  • the invention relates to a method for operating a push centrifuge, in which a push floor is moved cyclically relative to a Siebtrom ⁇ in the axial direction between an advanced and a retracted position in a forward or backward movement, the Schubzentri ⁇ fuge a mixture of substances fed in discontinuously in synchronization with the pushing cycle of the pushing floor and a solid cake is formed on the sieve drum.
  • a push centrifuge which has two centrifugal drums and in the pushing members are moved cyclically relative to the drums in the axial direction between an advanced and a retracted position.
  • fresh centrifuged material is constantly fed in via a line and placed in one or the other centrifugal drum.
  • the fresh centrifugal material is fed in with respect to each drum when the respective moving floors move back, begins in the foremost position of the moving floors and is continued up to their rearmost position. Accordingly, two feed zones of the pusher centrifuge are alternately served with fresh centrifugal material.
  • a filling device for centrifuges in which a moving floor is moved relative to a drum continuously in the axial direction between an advanced and a retracted position.
  • the impingement of the centrifugal drum is stopped when the moving floor moves forward before reaching the foremost moving floor position.
  • the supply of fresh centrifugal material to the drum is started again, the loading also taking place when the push floor is in its fully retracted position.
  • the loading of the drum with fresh centrifugal material thus takes place upon leaving the advanced position of the moving floor beyond the retracted position of the moving floor until the moving floor interrupts the supply of centrifugal goods on its way to its fully advanced position.
  • the pusher floor does not completely strip off the solid cake that forms when it moves forward, but rather pushes it in sections until the end of the solid cake has reached the end of the drum.
  • the pressure increase only begins after the moving floor moves forward after a certain distance when the solid cake has already accumulated. Due to the very short stroke of the moving floor in relation to the drum length, reliable forward movement is essential the solid cake is not guaranteed, ie the pusher kitchen will accumulate more and more.
  • the build-up of the solid cake means that on the one hand the desired amount of solid cake cannot be pushed away from the drum.
  • the desired dehumidification in the rear area of the drum is no longer achieved, since the amount of solid cake increases considerably due to the accumulation and a low residual moisture can no longer be achieved as a result.
  • the invention has for its object to provide a method with which a particularly large Gömisch throughput can be achieved with low residual moisture.
  • the invention provides that at least the predominant amount of the substance mixture is only supplied when the moving floor has started the backward movement from the advanced position, that the mixture supply is complete by a substance-dependent rest period before that point in time is terminated at which the moving floor begins the forward movement from the retracted position and that the predefinable rest period is set depending on the properties of the mixture of substances so that the solid cake has such a high shear strength due to partial dehumidification that the Solid cake is to be pushed down from the sieve drum through the moving floor without any significant compression.
  • the drum of the push centrifuge is only fed after leaving the front dead center of the push floor and only until a certain time before the beginning of the following forward movement of the push floor, the solid cake can be largely drained.
  • the rest time available for the solid cake according to the invention allows the solid cake to drain off accordingly, as a result of which the solid cake can consolidate.
  • the solid cake is not compressed by the moving floor, but pushed off as a block from the drum.
  • the inflow flow is interrupted in good time so that before the beginning of the displacement of the solid cake it has time for dewatering and can thereby achieve the necessary strength.
  • discontinuous mixture supply means that the mixture is not fed to the push centrifuge continuously, but only in certain positions of the push floor or at certain times. Accordingly, there are phases in which the thrust centrifuge mixture is supplied and phases in which no mixture supply takes place.
  • a cycle of the moving floor is the section in which the moving floor performs a constantly repeating movement between the advanced position, the so-called dead center (V.T.) and the retracted position, the so-called rear dead center (H.T.).
  • a cycle begins in this case from the forward movement of the push floor to the front dead center and the subsequent backward movement of the push floor to the rear dead center and, if appropriate, to the renewed forward movement of the push floor if the push floor is not at the rear dead center, for example another forward movement is carried out immediately, but there is a certain rest period at the rear dead center in rest position.
  • the entire amount of the substance mixture is only supplied when the push floor has started the backward movement from the advanced position, that in one operating mode of the push centrifuge, in which the push floor continuously runs through one cycle of motion after the other and yourself between the reversal points is constantly in motion, the feeding of the mixture of materials is started when the moving floor has covered a third of the way of its backward movement and that the feeding of the mixture of materials has ended when the moving floor has traveled two thirds of the way of its backward movement.
  • the moving floor remains in a retracted position during the mixture supply. In this position, the solid cake has the time required for draining, in which the cake on the drum is also sufficiently firm.
  • An optimized use can also be achieved in that a mixture is fed in before the front dead center of the moving floor is reached. However, the amount of the mixture which is supplied before the dead center of the moving floor is reached and beyond it must be less than the amount with which the drum is subsequently acted upon. Because a smaller amount of exposure is initially applied, the solid cake still has sufficient time to drain and thus to solidify. As a result of the initially lower amount of exposure, the pusher centrifuge is not flooded and the liquid in the solid cake is drained to such an extent that the storage volume in the solid cake has been freed up. which can be filled with liquid. With this procedure, there is no longer any fear of crushing the solid cake.
  • the smaller amount of the mixture is at most half the amount of the mixture supplied thereafter. If these quantitative ratios are observed, it is possible that the solid cake drains off enough and achieves the desired strength.
  • the mixture inflow is controlled with at least one valve.
  • the valve in the inlet pipe is expediently arranged as close as possible to the drum in order to prevent the mixture from overflowing.
  • the valve can be designed as an electromagnetically actuated valve, to which control pulses are supplied which are derived from the position or the actuating pressure of the moving floor.
  • valve is controlled depending on the operating pressure of the moving floor.
  • the valve can be designed as a pressure-actuated valve, which is connected to the hydraulics of the moving floor via pressure lines.
  • the actuating pressure of the push floor fluctuates with the different push phases in the push cycle and is therefore, like the position of the push floor, ideally suited for controlling the mixture supply.
  • the mixture is fed with a discontinuously operating feed pump, which is operated in synchronization with the overrun cycle. This eliminates problems that may arise when using valves, e.g. Thickening of the mixture, clogging of the valve etc. "avoided.
  • the mixture is preferably over an inlet pipe with at least two separate channels is supplied, of which at least one channel is connected to an additional mixture supply.
  • the supply can also take place in such a way that it switches between a larger and a smaller inflow.
  • a pusher centrifuge operated according to the invention in that at least one channel is connected to an additional mixture feed in the inlet tube. While one channel is used for continuous mixture supply, a control valve is arranged in the other channel, which serves for an additional mixture supply. As a result, less mixture can be supplied in the phase which is still critical for the mixture uptake, while an increased mixture supply takes place in the phase which is particularly favorable for the mixture uptake.
  • a hydrocyclone is connected upstream in the two channels, the underflow of the hydrocyclone serving as a constant mixture feed and the overflow of the hydrocyclone serving as an additional mixture feed.
  • the continuously supplied mixture is thus enriched with solid matter and can also be better enforced during the phase which is still critical for the mixture uptake.
  • the mixture absorption capacity during the phase which is particularly favorable for the mixture absorption is so great that the mixture supply not enriched in solid matter can be switched on from the overflow of the hydrocyclone. This also increases the throughput through the pusher centrifuge.
  • a control for an additional mixture supply can be carried out in a simple manner if a measuring sensor for the position or for the pressing pressure of the moving floor is arranged on the push centrifuge and if the additional supply can be controlled by the measuring signal.
  • the measurement signal can be used to actuate valves or additionally operating pumps, control logic controlling both the opening / closing ratio of the mixture supply and the phase position of the opening / closing cycle in relation to the cycle of the moving floor. This is necessary, for example, if a longer piece of inlet pipe is arranged between the control valve and the additional feed pump and the drum, the run-on of the mixture having to be provided by appropriately advanced control times.
  • the invention in a preferred embodiment deliberately introduces a rest period for the moving floor at the rear dead center, in which the Solid cake built up on the sieve drum should have the time and opportunity to be dehumidified and at the same time solidified.
  • the invention makes use of the knowledge that the continuous and constant movement of the push floor, in which the forward movement of the push floor directly follows the previous backward movement in the usual mode of operation of a push centrifuge, does not take into account the highest possible throughput of solids is particularly cheap. Rather, the invention teaches that after the pusher centrifuge has been filled and the free water has been partially filtered off, a further period of time must be available for the cake in which the cake is further dehumidified and solidified before the pusher floor is again moved forward.
  • the required rest time which is to be observed according to the invention, can either expire when the push floor is in its backward movement, or the push floor after a rapid movement at the rear dead center be stopped during this rest period.
  • FIG. 2 shows a highly schematic arrangement with the push centrifuge according to FIG. 1,
  • Figure 3 shows an arrangement according to FIG 2 with separate Ven ⁇ tilen for the quantity control and the Zeitsteue ⁇ tion of the mixture feed
  • Figure 4 rend the Beauftschungsphase combined continuous and discontinuous Ge mixed feed the assembly of FIG 2 with a currency ⁇
  • FIG. 5 shows an arrangement according to FIG. 4 with an upstream hydrocyclone
  • Figure 6 cross sections of different embodiments for inlet tube with two channels.
  • FIG. 7 shows an arrangement according to FIG. 2 with a disc-continuously operating piston diaphragm pump as the mixture feed element
  • Figure 8 is a plot of the pushing force of the moving floor over a pushing period.
  • a pusher centrifuge 10 is shown APPENDIC d of the operation in the separation of a mixture or a suspension is clarified.
  • the pusher centrifuge 10 contains a suspension 12 rotatable about the axis A for a screening drum consisting of two axial cylinder sections 14, 16.
  • the first cylinder section 14 is designed as a circular cylinder and is connected to the suspension 12 via the drum rear wall 17.
  • separation screens 18 are arranged for separating the mixture into solid and filtrate. The filtrate penetrates openings formed in the radial direction in the drum 14, 16 and thus passes into a filtrate space 32.
  • An inlet tube 20 is guided into the drum 14, 16, which in the last section 22 axially leads to the drum 14 , 16 is arranged.
  • a radially extending funnel-shaped sliding floor 24 is rotatably arranged on the end of the drum 14, 16 facing the rear wall 17 of the drum. The edge of the sliding floor 24 is essentially flush with the inner wall of the first cylinder section 14.
  • the push floor 24 is axially displaceable relative to the drum 14, 16 via a hydraulically actuated push rod 26.
  • Connected to the push floor 24 is an axially arranged inlet cone 28, which is conically widened in relation to this, the smaller diameter end 30 of which extends the axial section 22 of the inlet Grip tube 20 and axially displaceable relative to this.
  • the drum 14, 16 is surrounded by the filtrate space 32 with a filtrate drain 34 by collecting the filtrate flowing through the drum 14, 16.
  • the drum 14, 16 is open to the side facing away from the drum rear wall 17. This open side is surrounded by a collecting space 36 for the filter cake.
  • a mixture to be separated or a suspension to be separated is fed to the rotating drum 14, 16 via the inlet tube 20, 22.
  • the feed mixture is accelerated in the direction of rotation of the drum 14, 16 in the inlet funnel 28.
  • the mixture enters the drum 14, 16 between the moving floor 24 and the inlet funnel 28. Due to the high centrifugal force, there is a separation of the solid and the filtrate, the filtrate passing through the slotted screens 18 and the drum walls into the filtrate chamber 32.
  • a filter cake is formed on the inside of the drum 14, 16, which is pushed by the feed of the sliding floor 24, which is cyclically moved in the axial direction, at a frequency of, for example, 1 Hz to the open side of the drum 14, 16 into the collecting space 36.
  • the capacity of the filter cake for a new mixture is at the earliest in the last section of an overrun phase.
  • the push floor 24 is pushed forward, the newly formed filter cake is pressed.
  • the admission is
  • FIG. 1 the push centrifuge according to FIG. 1 is shown in a highly schematic manner in an operating arrangement. Identical parts are provided with identical reference symbols.
  • FIG. 2 shows an arrangement for synchronizing the intermittent mixture supply with the pushing movement of the pushing floor 24.
  • a sensor 42 is arranged, which either controls the position of the pushing floor 24 or the operating pressure in the drive mechanism 40 is detected.
  • a corresponding measurement signal is fed to a control valve 46 arranged in the inlet pipe 20 via a control line 44.
  • the measurement signal can be an electrical signal, which is transformed into opening and closing signals by electronics (not shown) and is supplied with the control valve 46 designed as an electromagnetic valve.
  • control lines 44 can be pressure lines which supply the operating pressure in the hydraulic drive mechanism 40 of the sliding floor 24 directly to a pressure control chamber of a pressure-actuated control valve 46.
  • control valves 46 and 52 from FIGS. 2 and 3 can also be actuated in such a way that they open throttled in the opening phase and have a complete degree of opening in the closing phase and thus allow throttled supply in the initial phase. In this way, the feed can be adjusted to a value during the advance of the push floor 24 which does not lead to a liquid saturation of the filter cake.
  • a control valve 64 is arranged for the additional mixture supply in the beat phase.
  • a control valve 66 for setting a steady mixture flow in the loading phase is arranged in the second channel 62. This arrangement switches the mixture supply in the loading phase between a lower and a higher inflow rate.
  • the control valve 74 being arranged in the first channel 70 for a timed mixture supply.
  • the mixture passes through a hydrocyclone 76 before being divided into the two channels 70, 72.
  • the underflow of the hydrocyclone is connected to the second channel 72.
  • the overflow * of the hydrocyclone 76 leads via a " storage container 78 into the first channel 70.
  • the capacity of the filter cake and the drum 14, 16 for a new mixture is very large, so that the mixture depleted of solids from the overflow of the hydrocyclone 76 forms a solid stable, undersaturated filter cake can be enforced.
  • the valve 80 switches off the mixture supply in the non-loading phase. 6 shows possible embodiments for an inlet tube 20 containing two channels.
  • the weld seam for separating the two channels need not be absolutely tight, since the separation of the channels is only intended to prevent a mutual interaction of the inflow flows. This interaction would occur if two channels opened into an inlet pipe 20 without subdivision, since the flow resistance for a second mixture flow would then increase when flowing through a mixture flow: -; Such interactions between the feeds are undesirable because of their undefined behavior.
  • FIG. 7 shows an arrangement according to FIG. 2, wherein instead of the controlled valve 46, a discontinuously operating piston diaphragm pump 80 is connected upstream of the inlet pipe 20.
  • the drive motor 82 of the pump 80 is clocked by control pulses which are fed to the motor 82 from the sensor 42 via the control line 44.
  • This enables the mixture supply to be synchronized with the push cycle of the push floor 24 without the use of valves.
  • the thrust force corresponding to the actuating pressure of the push floor 24 over a push cycle is shown in FIG. 8.
  • the rear dead center HT corresponds to the retracted position of the push floor 24. When the push floor 24 is pushed forward, the pushing force S 'increases sharply during an initial time V.
  • a specific trigger pressure point according to the pressure curve shown in FIG. 8 could be used here for the control with pressure lines according to FIG. 2.
  • a pressure operated control valve 46 is set to close at P. and open at a pressure P_. Shortly after the moving back of the moving floor, the control valve 46 is opened at point P_ and closed when point P- is reached.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Pour augmenter le débit dans un centrifugeur à cisaillement (10) dans lequel la base de cisaillement (24) est déplacée, dans le sens axial par rapport au tambour de tamisage (14, 16), dans une position avancée et rétractée par un mouvement cyclique vers l'avant et un mouvement cyclique vers l'arrière, respectivement, le mélange qui quitte la position avancée de la base de cisaillement (24) est acheminé au tambour de tamisage jusqu'à ce que le mouvement vers l'avant suivant soit sur le point de commencer. On augmente encore davantage le débit en amenant une faible quantité du mélange au tambour tamiseur (14, 16) à la fois avant que la base de cisaillement (24) n'atteigne sa position avancée et après que ladite base quitte sa position avancée.
EP90905502A 1989-04-13 1990-04-12 Procede pour utiliser un centrifugeur a cisaillement Expired - Lifetime EP0466751B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3912207 1989-04-13
DE3912207 1989-04-13
DE4010748 1990-04-03
DE4010748A DE4010748A1 (de) 1989-04-13 1990-04-03 Verfahren zum betrieb einer schubzentrifuge
PCT/EP1990/000583 WO1990011834A1 (fr) 1989-04-13 1990-04-12 Procede pour utiliser un centrifugeur a cisaillement

Publications (2)

Publication Number Publication Date
EP0466751A1 true EP0466751A1 (fr) 1992-01-22
EP0466751B1 EP0466751B1 (fr) 1995-03-29

Family

ID=25879910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90905502A Expired - Lifetime EP0466751B1 (fr) 1989-04-13 1990-04-12 Procede pour utiliser un centrifugeur a cisaillement

Country Status (11)

Country Link
US (1) US5356366A (fr)
EP (1) EP0466751B1 (fr)
JP (1) JPH04504529A (fr)
AT (1) ATE120383T1 (fr)
BR (1) BR9007288A (fr)
CA (1) CA2051122A1 (fr)
DE (2) DE4010748A1 (fr)
DK (1) DK0466751T3 (fr)
ES (1) ES2070318T3 (fr)
RU (1) RU2093274C1 (fr)
WO (1) WO1990011834A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5693403A (en) * 1995-03-27 1997-12-02 Kimberly-Clark Worldwide, Inc. Embossing with reduced element height
US7025211B2 (en) * 2003-04-16 2006-04-11 Ferrum Ag Double pusher centrifuge
ES2608852T3 (es) * 2003-04-16 2017-04-17 Ferrum Ag Centrífuga de empuje de varias fases
ATE397496T1 (de) * 2003-04-16 2008-06-15 Ferrum Ag Schubzentrifuge mit rotierbarem trichter zur vorbeschleunigung des gemisches
DE102010052301A1 (de) * 2010-11-23 2012-05-24 Gea Mechanical Equipment Gmbh Verfahren zur Verarbeitung eines Produktes im Zentrifugalfeld
CN103306619B (zh) * 2013-06-18 2015-09-23 内蒙古龙旺地质勘探有限责任公司 泥浆岩粉自动分离机
EP2959977B1 (fr) * 2014-06-24 2018-10-03 Ferrum AG Centrifugeuse à poussoir double ainsi que système de plancher coulissant
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
CN115970918B (zh) * 2023-03-17 2023-06-02 山东瑞弘生物科技股份有限公司 一种离心机斜盘布料器

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE504773A (fr) * 1950-09-02
US3063981A (en) * 1960-05-27 1962-11-13 Hercules Powder Co Ltd Manufacture of nitrocellulose
US3463316A (en) * 1968-06-19 1969-08-26 Baker Perkins Inc Centrifugal separating system
US3560125A (en) * 1968-07-08 1971-02-02 Pennwalt Corp Centrifuge apparatus
CH489282A (de) * 1968-10-30 1970-04-30 Escher Wyss Ag Schubzentrifuge mit zwei oder mehr Schleudertrommeln
DE2633477C2 (de) * 1976-07-26 1985-01-31 Paul 6702 Bad Dürkheim Schlöffel Verfahren und Vorrichtungen zum Entwässern von Feststoffsuspensionen
DE3104635A1 (de) * 1981-02-10 1982-09-23 Georg 8201 Kolbermoor Schilp Fuellvorrichtung fuer zentrifugen
CH653573A5 (de) * 1981-06-25 1986-01-15 Escher Wyss Ag Schubzentrifuge.
CH660695A5 (de) * 1982-09-06 1987-06-15 Escher Wyss Ag Doppel-schubzentrifuge.
DE3410423A1 (de) * 1984-03-21 1985-10-03 Krauss-Maffei AG, 8000 München Verfahren und vorrichtung zum trennen von stoffgemischen
CN85100169B (zh) * 1985-04-01 1985-09-10 中南制药机械厂 旁滤式自动离心机

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9011834A1 *

Also Published As

Publication number Publication date
ES2070318T3 (es) 1995-06-01
BR9007288A (pt) 1992-03-24
JPH04504529A (ja) 1992-08-13
EP0466751B1 (fr) 1995-03-29
DE4010748A1 (de) 1990-10-25
US5356366A (en) 1994-10-18
DE59008811D1 (de) 1995-05-04
DK0466751T3 (da) 1995-08-14
ATE120383T1 (de) 1995-04-15
DE4010748C2 (fr) 1991-04-11
WO1990011834A1 (fr) 1990-10-18
CA2051122A1 (fr) 1990-10-14
RU2093274C1 (ru) 1997-10-20

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