EP0342455B1 - Filterzentrifuge zum Trennen von Suspensionen - Google Patents

Filterzentrifuge zum Trennen von Suspensionen Download PDF

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Publication number
EP0342455B1
EP0342455B1 EP89108187A EP89108187A EP0342455B1 EP 0342455 B1 EP0342455 B1 EP 0342455B1 EP 89108187 A EP89108187 A EP 89108187A EP 89108187 A EP89108187 A EP 89108187A EP 0342455 B1 EP0342455 B1 EP 0342455B1
Authority
EP
European Patent Office
Prior art keywords
gas
collecting space
syphon
liquid
pressure
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.)
Expired - Lifetime
Application number
EP89108187A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0342455A2 (de
EP0342455A3 (en
Inventor
Günther Ing. Hultsch
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Priority to AT89108187T priority Critical patent/ATE94426T1/de
Publication of EP0342455A2 publication Critical patent/EP0342455A2/de
Publication of EP0342455A3 publication Critical patent/EP0342455A3/de
Application granted granted Critical
Publication of EP0342455B1 publication Critical patent/EP0342455B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/08—Other accessories for centrifuges for ventilating or producing a vacuum in the centrifuge

Definitions

  • the invention relates to a "filter centrifuge for separating suspensions" according to the preamble of claim 1.
  • Rotating siphon devices are attached to the drums of filter centrifuges according to German Patent Specification 22 60 461, which flow through the filtrate separated from the suspension after it has passed the filter medium and a collecting space, with the exclusion of gas.
  • the filtrate gets into a ring cup attached to the outside of the drum and is made from it e.g. derived by means of a peeling pipe which can be swung in and out.
  • the peeling tube is also used to adjust the liquid level in the ring cup. If this level is lowered into a region radially outside the filter medium, the siphon device causes a pressure drop under the filter medium, relative to the pressure in the centrifuge housing.
  • This increases the driving force that causes the filtration compared to conventional centrifuges by the pressure difference that exists between the surface of the filter cake and the collecting space, and the filtration is accelerated.
  • gas which has penetrated into the collecting space can be displaced after each centrifuging batch, ie after the filter cake has been peeled out of the drum.
  • liquid is poured into the ring cup of the siphon device and the peeling tube is pivoted out of the ring cup.
  • a suction line branches off from the collecting space and communicates with the centrifuge housing via a liquid suction pump, a vacuum space being established in the collecting space radially within the liquid level, which regulates the filtration speed elevated.
  • this device requires gas in the form of a vacuum gas space, the vacuum being able to be ensured only if sufficient quantities of filtrate liquid act on the liquid suction pump.
  • a filter centrifuge is known from EP-A 0 247 401, which likewise shows a gas discharge line branching off from a gas space inside the filtrate collecting space, via which, when the filter centrifuge is operated with compressed gas filtration, compressed gas which has penetrated the filter cake is passed from the gas space to the outside of the centrifuge housing can.
  • compressed gas filtration requires a gas space to allow compressed gas to flow through the filter cake.
  • a device which allows gas which has penetrated into the collecting space during a centrifuging batch to be rapidly displaced into the housing surrounding the drum.
  • gas discharge lines are preferably provided in the rear wall of the drum and are provided with a pressure-dependent outflow device.
  • the outflow device can consist of a valve which opens at a slight overpressure in the collecting chamber compared to the pressure prevailing in the centrifuge housing and closes at an opposite pressure drop, that is to say a greater pressure in the housing than in the collecting chamber.
  • the outflow device consists of a rotating siphon which is filled with liquid and is designed such that gas flows from the collecting space to the housing at a low pressure drop from the collecting space to the housing and gas closure at a greater pressure drop from the housing to the collecting space is guaranteed.
  • the feed and discharge devices filling pipe (2), peeling knife (3), solids chute (4), pressure relief valve (5), backwash pipe (6) and filtrate peeling pipe (7) are attached to the housing (1).
  • the siphon drum (9) with the filter medium (10), the collecting space (11), the siphon disc (12) and the ring cup (13) is seated on the shaft (8). According to the figure, a filter cake (14) is deposited on the filter medium (10).
  • the collecting space (11) is partially filled with filtrate liquid (15), which has a lower (radially larger) liquid level in the ring cup (13).
  • filtrate liquid (15) which has a lower (radially larger) liquid level in the ring cup (13).
  • the centrifuge drum (9) is then charged with suspension via the filling tube (2).
  • the filtrate peeling tube (7) swings into the ring cup (13) and lowers the liquid level in the ring cup (13) compared to the level in the collecting chamber (11).
  • a low pressure arises under the filter medium (10) compared to the surrounding housing.
  • the pressure difference is determined by the accelerated mass of the liquid column ⁇ h +.
  • a ⁇ h + For example, with an acceleration of 1000 x 9.81 m / s2 and water as the filtrate liquid, a ⁇ h + of 20 mm, a pressure difference of 2 bar.
  • an increasing gas cushion is formed in the collecting space (11) as a result of gas ingress through the filter cake or degassing of the filtrate, ⁇ h + and thus the additional pressure drop become smaller.
  • the filtrate peeling tube (7) is now swung out again and liquid is poured into the ring cup (13) through the backwashing tube (6).
  • This process results in a short-term reduction in the filtration speed because it e.g. can be accomplished in 20 s.
  • the peeling tube (7) is then swiveled in again, whereby the check valve (18) closes automatically and ⁇ h + again assumes a maximum value.
  • a siphon device is used instead of the check valve (18).
  • the horizontal branch (19) of the bore (17) is connected to a down pipe (20), the lower end of which (21) in the siphon cup (21).
  • liquid is filled into the siphon cup (21) through the refill tube (22).
  • the refill tube (22) can also take over the function of the backwash tube (6) because the liquid overflowing from the small siphon cup (21) gets into the ring cup (13).
  • Fig. 2 shows the device in the "filtering" operating state. Because in this case the internal pressure of the centrifuge housing is greater than the pressure in the collecting chamber (11), the two liquid columns ⁇ h + generate the same, hydrostatic pressures. Because the liquid column ⁇ h + in the downpipe (20) is subject to a lower centrifugal acceleration than the column between the collecting space (11) and the ring cup (13), which is located radially further outwards, this inner column has a larger, radial extension. Both columns close the gas to the collecting space (11).
  • Fig. 3 shows the device in the "displacement" operating state.
  • gas has entered the collecting space (11) from the filtrate liquid and / or through the filter cake, this must be displaced.
  • liquid is simultaneously filled into the siphon cup (21) and the ring cup (13) with the refill tube (22).
  • the liquid column displaces ⁇ h - the gas which has entered the collecting space (11) through the downpipe (20). Because ⁇ h - in the siphon cup (21) can only assume a low value due to the low rim ring, the gas bubbles through this siphon cup into the interior of the housing.
  • the rim of the siphon cup (21) can be kept very low because its cross-sectional area has a multiple of the cross-sectional area of the downpipe (20).
  • a slight lowering of the level in the siphon cup (21) is sufficient to build up a liquid column ⁇ h + in the downpipe (20) corresponding to the pressure difference without it being necessary to add liquid through the refill pipe (22) .
  • Fig. 4 shows a pressure sensor (23) in the filtrate collecting space (11) which reports pressure measurement values to the control system via cable (24) and slip rings (not shown in the drawing) or a transmitter.
  • the displacement of gas from the collecting space (11) into the centrifuge housing (1) can be controlled in a pressure-dependent manner.
  • the filtrate peeling tube (7) swings out and liquid is filled into the ring cup (13) through the backwashing tube (6).
  • the advantage of the device according to the invention is not limited to the displacement of gas during centrifugation.
  • the device can also be used advantageously if the solid has been peeled apart from a residual layer.
  • liquid had to be filled into the ring cup (13) when the peeling tube (7) was swung out, on the one hand to displace gas before the next batch and on the other hand to regenerate the remaining layer and the filter medium (10) by backwashing. If the resistance of the residual layer and filter medium was high, this process was time-consuming on the one hand and difficult to control on the other hand. In the case of large resistances, and possibly different for each batch, the volume flow of the liquid supplied would have to be adapted to this resistance. If the volume flow was too large, some of the liquid ran unused into the centrifuge housing via the rim ring of the ring cup (13).
  • the collecting space (11) was still largely filled with gas, a considerable pressure could arise against the filter medium (10) due to the length of the liquid column ⁇ h, until the filter medium was damaged.
  • the pressure in the collecting space (11) can only be as great as the resistance of the gas outflow device. Only when the liquid reaches the filter medium (10) from the collecting space (11) does the pressure difference still work remaining small column ⁇ h - and the filter medium (10) is flowed through.
  • the liquid supplied to the ring cup (13) can be metered precisely due to the new device and an ineffective overflow via the rim ring of the ring cup (13) is avoided.

Landscapes

  • Centrifugal Separators (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP89108187A 1988-05-19 1989-05-05 Filterzentrifuge zum Trennen von Suspensionen Expired - Lifetime EP0342455B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108187T ATE94426T1 (de) 1988-05-19 1989-05-05 Filterzentrifuge zum trennen von suspensionen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3817126A DE3817126A1 (de) 1988-05-19 1988-05-19 Filterzentrifuge zum trennen von suspensionen
DE3817126 1988-05-19

Publications (3)

Publication Number Publication Date
EP0342455A2 EP0342455A2 (de) 1989-11-23
EP0342455A3 EP0342455A3 (en) 1990-11-07
EP0342455B1 true EP0342455B1 (de) 1993-09-15

Family

ID=6354734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108187A Expired - Lifetime EP0342455B1 (de) 1988-05-19 1989-05-05 Filterzentrifuge zum Trennen von Suspensionen

Country Status (6)

Country Link
US (1) US5032258A (enrdf_load_stackoverflow)
EP (1) EP0342455B1 (enrdf_load_stackoverflow)
JP (1) JPH0217957A (enrdf_load_stackoverflow)
AT (1) ATE94426T1 (enrdf_load_stackoverflow)
DE (1) DE3817126A1 (enrdf_load_stackoverflow)
ES (1) ES2045245T3 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0714109B2 (ja) * 1988-06-23 1995-02-15 三菱マテリアル株式会社 セラミック複合回路基板
DE19703353C2 (de) * 1997-01-30 2003-10-09 Krauss Maffei Process Technolo Verfahren zum Betrieb einer Filterzentrifuge
FR2808458B1 (fr) * 2000-05-02 2002-08-09 Cogema Dispositif de filtration rotatif en continu d'un liquide tel qu'une solution contenant un precipite
US7686965B2 (en) * 2006-05-31 2010-03-30 Cook Melvin W Centrifugal fluid filtration devices, systems and methods
CN104984836A (zh) * 2015-06-16 2015-10-21 镇江港和新型建材有限公司 具有双层转鼓结构的离心机
JP2021506576A (ja) * 2017-12-19 2021-02-22 ゼロス リミテッド 処理装置のためのろ過器
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
KR102504659B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
CN112317143A (zh) * 2020-09-27 2021-02-05 濮阳天健生物科技有限公司 一种合成5-甲基四唑用过滤离心分离器

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1190842A (en) * 1915-11-13 1916-07-11 Frank K Atkins Centrifugal-pressure filter.
US3377019A (en) * 1965-09-15 1968-04-09 Baker Perkins Inc Methods and apparatus for maintaining a liquid head in a centrifuge
DE1757532C3 (de) * 1968-05-17 1979-08-23 Rudolf F. Ing.(Grad.) 2000 Norderstedt Garbaty Auslaufregler für einen Zentrifugalseparator
FR206069A (enrdf_load_stackoverflow) * 1970-06-09
DE2260461C3 (de) * 1972-12-11 1980-06-04 Krauss-Maffei Ag, 8000 Muenchen Filterzentrifuge
DE2603610A1 (de) * 1976-01-30 1977-08-04 Krauss Maffei Ag Zentrifugentrommel mit seitenfiltration
US4095615A (en) * 1976-05-21 1978-06-20 Ramco Manufacturing, Inc. Check valve and siphon tube assembly employing same
FR2424530A2 (fr) * 1978-04-25 1979-11-23 Faure Jean Godets pour disque de transfert d'analyseur centrifuge et procede de remplissage de tels godets
NL7804735A (nl) * 1978-05-03 1979-11-06 Esmil B V Stationsstraat 48 Vacuum filter met roterende trommel.
SU787951A1 (ru) * 1978-12-21 1980-12-15 Ленинградский Ордена Ленина, Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Горный Институт Им. Г.В.Плеханова Способ определени сопротивлени фильтрующего сло в вакуум-фильтрах
FR2496498A1 (fr) * 1980-12-19 1982-06-25 Robatel Slpi Centrifugeuse filtrante
DE3617768A1 (de) * 1986-05-27 1987-12-03 Krauss Maffei Ag Filterzentrifuge
DE3626314C2 (de) * 1986-08-02 1993-11-11 Krauss Maffei Ag Vorrichtung zum Trennen von Suspensionen
US4759857A (en) * 1986-08-04 1988-07-26 Acuna Eduardo M Open siphon filter method
DE3726227A1 (de) * 1987-08-07 1989-02-16 Krauss Maffei Ag Vorrichtung zum ergebnisabhaengigen steuern einer filterzentrifuge

Also Published As

Publication number Publication date
EP0342455A2 (de) 1989-11-23
ATE94426T1 (de) 1993-10-15
US5032258A (en) 1991-07-16
DE3817126A1 (de) 1989-11-30
DE3817126C2 (enrdf_load_stackoverflow) 1991-04-04
EP0342455A3 (en) 1990-11-07
JPH0217957A (ja) 1990-01-22
ES2045245T3 (es) 1994-01-16

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