EP0466751B1 - Procede pour utiliser un centrifugeur a cisaillement - Google Patents

Procede pour utiliser un centrifugeur a cisaillement Download PDF

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Publication number
EP0466751B1
EP0466751B1 EP90905502A EP90905502A EP0466751B1 EP 0466751 B1 EP0466751 B1 EP 0466751B1 EP 90905502 A EP90905502 A EP 90905502A EP 90905502 A EP90905502 A EP 90905502A EP 0466751 B1 EP0466751 B1 EP 0466751B1
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EP
European Patent Office
Prior art keywords
pusher plate
mixture
pusher
process according
drum
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Expired - Lifetime
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EP90905502A
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German (de)
English (en)
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EP0466751A1 (fr
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Werner Dr. Stahl
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    • 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 pusher centrifuge, in which a moving floor is moved cyclically relative to a sieve drum in the axial direction between an advanced and a retracted position in a forward or backward movement, the pusher centrifuge discontinuously mixing a mixture of substances in synchronization with the pusher cycle of the Moving floor is fed and a solid cake is formed on the sieve drum, at least the majority of the mixture of substances being fed in only when the moving floor has started the backward movement from the advanced position.
  • 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 application 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 moving floor is in its fully retracted position.
  • the loading of the drum with fresh centrifugal material thus takes place when 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 moving floor does not completely strip off the solid cake which forms as it moves forward, but rather pushes it forward 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 advancement of the solid cake is not guaranteed, i.e. the puff cake will build up more and more.
  • the accumulation of the solid cake has the result 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.
  • a push centrifuge which has two centrifugal drums and is moved cyclically in the axial direction between an advanced and a retracted position in the thrust members relative to the drums. With this push centrifuge, fresh centrifuged material is constantly fed in via a line and placed in one or the other centrifugal drum.
  • the fresh centrifuged 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 until they are in the rearmost position. Accordingly, two feed zones of the pusher centrifuge are operated alternately with fresh centrifuged material.
  • the invention has for its object to provide a method with which a particularly large mixture throughput can be achieved with low residual moisture.
  • the invention provides that the mixture supply is completely stopped by a substance-dependent rest period before the time 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 that the solid cake has such a high shear strength due to partial dehumidification that the solid cake can be pushed through the moving floor without any significant compression from the sieve drum.
  • 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 accordingly, whereby the solid cake solidifies accordingly can.
  • the solid cake is not compressed by the moving floor, but pushed off as a block from the drum.
  • the feed flow is interrupted in such a timely manner that before the beginning of the shifting of the solid cake it has time for dewatering and can thereby achieve the necessary strength.
  • batch mixture mixture is understood to mean 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 mixture is fed to the pusher centrifuge and phases in which no mixture is fed.
  • 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 (VT) and the retracted position, the so-called rear dead center (HT).
  • a cycle begins in this case from the forward movement of the moving floor to the front dead center and the subsequent backward movement of the moving floor to the rear dead center and, if appropriate, to the renewed forward movement of the moving floor if the moving floor does not immediately make a forward movement again at the rear dead center, but there is a certain rest period at the back dead center in the rest position.
  • the entire amount of the mixture of substances is only supplied when the moving floor has started the backward movement from the advanced position, that in an operating mode of the pusher centrifuge, in which the pusher floor runs continuously one cycle after the other and between the turning points is constantly in motion, the feeding of the material mixture 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 substances is stopped when the moving floor has covered two thirds of the way of its return movement.
  • the capacity of the barrel of the pusher centrifuge is particularly large, with the solid cake applied leaving enough time for dewatering in order to achieve the necessary strength.
  • 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.
  • the amount of the mixture which is supplied before reaching the dead center of the moving floor and beyond it, must be less than the amount with which the drum is then applied. 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 has already drained to such an extent that storage volume in the solid cake has been freed again. which can be filled with liquid. With this procedure, there is no longer any fear of crushing the solid cake.
  • 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 operating 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 operating pressure of the moving floor fluctuates with the different pushing phases in the pushing cycle and, like the position of the moving floor, is therefore 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. Avoid thickening of the mixture, clogging of the valve etc.
  • the mixture is preferably over an inlet pipe with at least two separate channels, 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 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 be better enforced even during the phase that 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 feed 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 regulation 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, with 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 additionally operating feed pump and the drum, the after-run of the mixture having to be provided by suitably brought forward 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 on the Sieve drum built solid cake should have time and opportunity to be dehumidified and solidified at the same time.
  • the invention makes use of the knowledge that the continuous and constant movement of the moving floor, in which the forward movement of the moving floor directly follows the previous backward movement in the usual mode of operation of a push centrifuge, is not necessarily particularly favorable with regard to the highest possible throughput of solids . 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 advantages according to the invention are simultaneously made in this way according to the invention achieved that an extraordinarily large throughput is achieved, that the cake can be pushed off the sieve drum with relatively little force and that at the same time a low residual moisture can be maintained.
  • the required rest time which is to be observed according to the invention, can either take place when the push floor is in its backward movement, or the push floor can be stopped during this rest time after a rapid movement at the rear dead center.
  • a pusher centrifuge 10 is shown, by means of which the procedure for the separation of a mixture or a suspension is illustrated.
  • 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.
  • a conical second cylinder section 16 adjoins the open side of the first cylinder section 14.
  • slotted 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 pipe 20 is guided into the drum 14, 16 and is arranged in the last section 22 axially to the drum 14, 16 .
  • 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 operated push rod 26.
  • Connected to the push floor 24 is an inlet funnel 28 which is axially arranged and conically widened to this end, the end 30 of which the diameter is smaller than the axial section 22 of the inlet pipe 20 engages around and axially displaceable.
  • 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 pipe 20, 22.
  • the mixture fed is accelerated in the direction of rotation of the drum 14, 16.
  • the mixture enters the drum 14, 16 between the moving floor 24 and the inlet funnel 28. Due to the high centrifugal force, the solid and the filtrate are separated, 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 filter cake can only absorb a new mixture in the last section of an overrun phase.
  • the push floor 24 When the push floor 24 is pushed forward, the newly formed filter cake is pressed. In this phase is the absorption capacity of the filter cake for a newly added mixture is very low, which usually results in the filter cake becoming oversaturated with the mixture.
  • the internal cohesion of the filter cake is largely lost, as a result of which the filter cake builds up to a greater thickness and as a result part of the mixture can flow along the surface of the filter cake directly into the collecting space 36.
  • the upsetting of the filter cake to greater thicknesses in turn adversely affects the operating parameters of the pusher centrifuge, so that, for example, only lower rotational speeds can be operated with the pusher centrifuge.
  • the different mixture absorption capacity of the filter cake of the drum 14, 16 is now taken into account in that the mixture is not continuously supplied, the supply periods being synchronized with the position of the moving floor 24.
  • the mixture supply can be interrupted or opened again.
  • an equal-quantity mixture supply is most favorable when the push floor 24 has left front dead center and, most advantageously, only lasts until the push floor has not yet completely reached rear dead center.
  • a lower mixture loading can already take place when the push floor 24 has not yet completely reached the front dead center. In this way, stable filter cakes are obtained which are drained sufficiently and thus achieve sufficient strength.
  • a less defined filter cake thickness and a homogeneous filter cake consistency are achieved, which allow higher rotary speeds of the pusher centrifuge and thus a higher mixture throughput.
  • FIG. 1 the pusher 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 interrupted mixture supply with the pushing movement of the pushing floor 24.
  • a sensor 42 is arranged, which either the position of the pushing floor 24 or the operating pressure in the drive mechanism 40 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 in this case 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 moving 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 full opening degree in the closing phase and thus allow throttled feeding in the initial phase. In this way, the feed during the advancement of the moving floor 24 can be set to a value which does not lead to a liquid saturation of the filter cake.
  • a control valve 64 for the additional mixture supply in the loading phase is arranged in the first channel 60.
  • 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 arrangement from FIG. 5 has two channels 70, 72 in the inlet pipe 20, similar to the arrangement from FIG. 4, the control valve 74 for a timed mixture supply being arranged in the first channel 70.
  • 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 control valve 74 opens. In this phase, 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 stable, undersaturated filter cake can be enforced.
  • the valve 80 switches off the mixture supply in the non-loading phase.
  • FIG. 6 shows possible embodiments for an inlet pipe 20 containing two channels.
  • the weld seam for separating the two channels does not need to 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 would open into an inlet pipe 20 without subdivision, since the flow resistance for a second mixture flow would then increase when a mixture flow flows through it. 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.
  • H.T. corresponds to the retracted position of the sliding floor 24.
  • the backward movement of the push floor 24 begins, the pushing force S 'falling sharply.
  • 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 actuated control valve 46 is set so that it closes at P1 and opens at a pressure P2. Shortly after the moving back of the moving floor, the control valve 46 is opened at point P2 and closed when point P1 is reached. After-running of the mixture in the inlet pipe 20 located between the control valve 46 and the drum 14, 16 can be remedied by moving the points P 1 and P 2 forward.

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Claims (15)

  1. Procédé pour utiliser un centrifugeur à cisaillement, dans lequel un fond de cisaillement est mis en mouvement cyclique par rapport à un tambour filtrant dans la direction axiale entre une position avancée et une position reculée, en un mouvement vers l'avant et vers l'arrière, un mélange de substances étant introduit de manière discontinue dans le centrifugeur à cisaillement en synchronisation avec le cycle de cisaillement du fond de cisaillement et un gâteau de matières solides se formant sur le tambour filtrant, et au moins la majeure partie du mélange de substances n'étant introduite que lorsque le fond de cisaillement a débuté son mouvement vers l'arrière depuis la position avancée,
    caractérisé en ce que l'introduction du mélange est complètement terminée avant, d'un intervalle de temps de repos dépendant de la substance, l'instant auquel le fond de cisaillement (24) débute son mouvement vers l'arrière depuis la position avancée, et en ce que l'intervalle de temps de repos imposable est déterminé en fonction des propriétés du mélange de substances de telle sorte que le gâteau de matières solides, par déshumidification partielle, a atteint une résistance au cisaillement tellement élevée que le gâteau de matières solides peut être poussé vers le bas à travers le fond de cisaillement (24) sans refoulement notable du tambour filtrant (14).
  2. Procédé selon la Revendication 1, caractérisé en ce que l'intégralité du mélange de substances n'est introduite que lorsque le fond de cisaillement (24) a débuté son mouvement vers l'arrière depuis la position avancée.
  3. Procédé selon la Revendication 1, caractérisé en ce que l'introduction du mélange de substances débute dès pendant le mouvement vers l'avant du fond de cisaillement (24).
  4. Procédé selon la Revendication 2, caractérisé en ce que , dans un mode de fonctionnement du centrifugeur à cisaillement (10), dans lequel le fond de cisaillement (24) passe en continu d'un cycle de mouvement à un autre et se trouve toujours en mouvement entre les points de retour, l'introduction du mélange de substances débute lorsque le fond de cisaillement (24) a couvert un tiers du trajet de son mouvement vers l'arrière, et en ce que l'introduction du mélange de substances est terminé lorsque le fond de cisaillement (24) a couvert deux tiers de son mouvement vers l'arrière.
  5. Procédé selon la Revendication 2, caractérisé en ce que les mouvements vers l'avant et vers l'arrière du fond de cisaillement (24) sont effectués immédiatement l'un après l'autre en une fraction de la durée totale du cycle, en ce que le fond de cisaillement reste au repos dans la position reculée pendant une durée imposable, et en ce que l'intégralité du mélange de substances est introduite pendant la position au repos du fond de cisaillement (24).
  6. Procédé selon l'une des Revendications précédentes, caractérisé en ce que , comme critère pour déterminer la durée de l'intervalle de repos, on part du degré d'avance du gâteau de matières solides résultant du rapport entre la course du gâteau et la course du fond de cisaillement.
  7. Procédé selon la Revendication 6, caractérisé en ce que le mouvement vers l'avant du fond de cisaillement (24) est effectué avec un degré d'avance de l'ordre d'au moins environ 0,9.
  8. Procédé selon l'une des Revendications 1 à 7, caractérisé en ce que l'arrivée de mélange est branchée avec au moins un robinet (46; 52; 64; 74), lequel est commandé en fonction de la pression d'actionnement du fond de cisaillement (24).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le mélange est introduit à travers une pompe d'alimentation (80) travaillant en discontinu, et qui est actionnée en synchronisation avec le cycle de cisaillement.
  10. Procédé selon la Revendication 3, caractérisé en ce que le mélange est introduit à travers un tuyau d'arrivée (20) comprenant au moins deux canaux séparés (60, 62; 70, 72), dont un canal (60; 70) est relié à une arrivée de mélange supplémentaire.
  11. Procédé selon la Revendication 10, caractérisé en ce que le canal (70) relié à l'arrivée de mélange supplémentaire est relié au déversoir d'un hydrocyclone (76) placé en aval, dont l'écoulement inférieur débouche dans un deuxième canal (72), qui sert d'arrivée permanente de mélange pendant une phase de mise sous charge.
  12. Procédé selon l'une des Revendications précédentes, caractérisé en ce qu 'un capteur de mesure (42) de la position et/ou de la pression du fond de cisaillement (24à est placé sur le centrifugeur à cisaillement (10) et en ce que l'arrivée de mélange peut être pilotée par un signal de mesure, lequel est délivré par ce capteur de mesure (42).
  13. Procédé selon la Revendication 12, caractérisé en ce que le capteur de mesure (42) est relié par au moins une conduite de pression (44) à un robinet actionné par pression (46; 52; 64; 74) ou à une pompe d'alimentation (84) pilotée par pression et fonctionnant en discontinu.
  14. Procédé selon l'une des Revendications précédentes, caractérisé en ce qu 'un capteur électro-optique est utilisé pour déterminer par une technique de mesure la modification de la surface du gâteau de matières solides et, en fonction du comportement du gâteau ainsi déterminé, lequel est observé pendant le mouvement vers l'avant du fond de cisaillement (24), ajuster la durée de l'intervalle de repos.
  15. Procédé selon la Revendication 14, caractérisé en ce qu 'un palpeur est prévu, avec lequel le trop-plein du centrifugeur à cisaillement est déterminé et l'arrivée de mélange est réduite lorsque le centrifugeur à cisaillement (10) commence à être submergé.
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
DE4010748A DE4010748A1 (de) 1989-04-13 1990-04-03 Verfahren zum betrieb einer schubzentrifuge
DE4010748 1990-04-03
PCT/EP1990/000583 WO1990011834A1 (fr) 1989-04-13 1990-04-12 Procede pour utiliser un centrifugeur a cisaillement

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

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EP90905502A Expired - Lifetime EP0466751B1 (fr) 1989-04-13 1990-04-12 Procede pour utiliser un centrifugeur a cisaillement

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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)

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EP1468744B1 (fr) * 2003-04-16 2008-06-04 Ferrum AG Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange
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
PL2959977T3 (pl) * 2014-06-24 2019-03-29 Ferrum Ag Wirówka pulsacyjna o działaniu ciągłym oraz urządzenie tarczy przesuwnej
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

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Publication number Publication date
EP0466751A1 (fr) 1992-01-22
BR9007288A (pt) 1992-03-24
DE4010748C2 (fr) 1991-04-11
ES2070318T3 (es) 1995-06-01
ATE120383T1 (de) 1995-04-15
RU2093274C1 (ru) 1997-10-20
JPH04504529A (ja) 1992-08-13
WO1990011834A1 (fr) 1990-10-18
DK0466751T3 (da) 1995-08-14
DE4010748A1 (de) 1990-10-25
US5356366A (en) 1994-10-18
CA2051122A1 (fr) 1990-10-14
DE59008811D1 (de) 1995-05-04

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