EP1228807B1 - Dispositif pour racler le gateau solide d'une centrifugeuse - Google Patents

Dispositif pour racler le gateau solide d'une centrifugeuse Download PDF

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Publication number
EP1228807B1
EP1228807B1 EP20020002472 EP02002472A EP1228807B1 EP 1228807 B1 EP1228807 B1 EP 1228807B1 EP 20020002472 EP20020002472 EP 20020002472 EP 02002472 A EP02002472 A EP 02002472A EP 1228807 B1 EP1228807 B1 EP 1228807B1
Authority
EP
European Patent Office
Prior art keywords
gas
scraping blade
solids
scraping
blade device
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
EP20020002472
Other languages
German (de)
English (en)
Other versions
EP1228807A1 (fr
Inventor
Johannes Feller
Gunnar Grim
Erich Dommer
James Kevin Mcgillicuddy
Frank Geiselhart
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.)
Krauss Maffei Kunststofftechnik GmbH
Krauss Maffei Process Technology AG
Original Assignee
Krauss Maffei Kunststofftechnik GmbH
Krauss Maffei Process Technology 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 Kunststofftechnik GmbH, Krauss Maffei Process Technology AG filed Critical Krauss Maffei Kunststofftechnik GmbH
Publication of EP1228807A1 publication Critical patent/EP1228807A1/fr
Application granted granted Critical
Publication of EP1228807B1 publication Critical patent/EP1228807B1/fr
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
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof

Definitions

  • the invention relates to a device for peeling a solids cake from a centrifuge drum according to the preamble of patent claim 1 and to a method according to the preamble of patent claim 10.
  • the process sequence in the centrifuge is divided into the following steps: filling, washing the filter cake, spin-drying the filter cake and the automatic discharge of the filter cake.
  • the solids discharge takes place in that a paring knife, which is arranged on a so-called scraper, moves into the centrifuge drum, peels off the filter cake and in that the filter cake is conveyed out of the centrifuge by a discharge element.
  • this Austragsorgan consists of holes in the drum base and a so-called. Schurre (steep sliding surface) in the bottom of the centrifuge housing.
  • the solids discharge can only be done at low speed, as at high speed, the solid would not fall through the holes in the drum base and in the chute.
  • the most commonly used method is to coat the surface with a substance which has a low adhesion tendency to the solids, or to mass-produce scrapers from such materials.
  • many of these coatings have a much lower resistance to corrosion compared to the highly resistant base material of the centrifuge (stainless steel, nickel-based materials, titanium, etc.), so that they have to be renewed after a relatively short operating time. If the coating has too low or high solubility against the suspension, washing or cleaning fluid, it has too short a service life or can lead to contamination of the products to be processed.
  • the coatings are highly dependent on the solid to be processed, so that the same base materials different coating materials must be used.
  • the coatings usually consist of plastics which have a lower abrasion resistance, which contributes to a shorter service life and to the problem of contamination.
  • the scraper can be designed as a suction nozzle, wherein the suction nozzle opens into a pipe system that leads from the centrifuge. From the centrifuge, a gas stream is sucked through the suction nozzle, wherein the extracted gas can flow into the housing, either via suitable openings or via a suitable gas supply. In operation, the precipitated solid is entrained by the gas flow and discharged through the piping system from the centrifuge.
  • a gas flow is sucked through the suction nozzle, wherein the extracted gas can flow into the housing, either via suitable openings or via a suitable gas supply.
  • the precipitated solid is entrained by the gas flow and discharged through the piping system from the centrifuge.
  • DE 33 40 636 C2 Such a system is known from DE 33 40 636 C2. This system requires a relatively high gas flow and accordingly requires a high expenditure on equipment. Furthermore, the solids must be separated again from the gas stream, which further increases the expenditure on equipment.
  • screws can also be used as discharge elements, in particular in the case of relatively sticky or viscous solids.
  • slugs are relatively difficult to clean and do not meet the cleaning requirements of, for example, the pharmaceutical industry. Therefore, the use of screws for the separation of high purity products is undesirable.
  • the invention has for its object to provide a device for peeling solids cake from a centrifuge drum and a corresponding method, are effectively avoided in the deposition of solids on the reamer.
  • a paring knife device the so-called scraper, has a gas supply and at least one gas outlet opening which is arranged so that an outgoing gas stream is formed at least in a part of the surface area of the paring knife device.
  • air or inert gases are used as the gas.
  • an air or gas stream is introduced in such a way that there is a uniform overflow of those surfaces of the reamer over which the precipitated solid slides and on which there is a tendency for caking.
  • This function is achieved by generating the gas flow between the stream of powdered solid and the reamer surfaces. By this gas flow is achieved that the solid particles are kept so to speak by an air cushion at a distance from the surface of the reamer.
  • the introduction of the gas stream may e.g. by a corresponding shaping of the paring knife, by means of which a gas flow applied centrally via a pipe system (or bore system) centrally behind the paring knife is evenly distributed over the region in which the solids flow takes place.
  • a gas flow applied centrally via a pipe system (or bore system) centrally behind the paring knife is evenly distributed over the region in which the solids flow takes place.
  • the gas stream can ideally be abandoned in the flow direction of the solids flow. It is also conceivable to adjust the gas flow at a different angle, e.g. 45 °, perpendicular or even to let escape against the flow of solids, wherein the gas flow is deflected by the flow of solids and thus the sliding over the surfaces of the reamer gas cushion is formed.
  • the nozzles for discharging the gas stream may e.g. can be formed by two components, such as the reamer and the paring knife, but can also be formed by the corresponding design of slots or holes in a component such as the paring knife, the reamer or a separate component.
  • a device is arranged so that, together with the product stream, a gas stream is formed, which forms between the solids flow and the relevant wall of the reamer. It is also conceivable that the gas stream abandoned before the reamer and through the solid stream is blown or is also abandoned behind the reamer and can be formed by devices and / or the driving style of the reamer accordingly. It is conceivable the task of gas flow behind the reamer, wherein the reamer is designed as a serrated knife or corrugated and are formed by an axial movement of the pink knife despite the peeling process between the product and spikes / column, which allow the passage of the gas stream.
  • the proposed design is independent of the centrifuge and scraper materials used, regardless of the product and solvent to be processed, and largely independent of the scraper's geometric design.
  • Fig. 1 shows schematically in side view (axial view) a centrifuge drum 1, wherein on the inside of the drum wall, a filter means 11 is provided.
  • a peeling knife device with a strut 21, a knife holder 5 and a paring knife 3 is arranged, the device between a position A, in which the paring knife is removed from the wall of the drum 1, and in a position C, in the peeling blade 3 is located in the region of the drum shell 1, is pivotable.
  • the paring knife 3 extends axially along the entire inside length of the drum. It may also be shorter, the reamer should be axially movable.
  • the peeling knife device In operation of the centrifuge, the peeling knife device is in the position A, the drum is rotated, and on the drum inner side of the filter means 11 side facing a solid cake 13 is formed.
  • the paring knife When the solid cake 13 has reached a predetermined thickness, with the drum rotating, the paring knife is moved toward the solids cake and peels solids 15 from the solid cake.
  • the solids 15 fall due to gravity in a arranged below the paring knife discharge (Schurre) and are discharged from there to the outside.
  • FIG. 2 shows, holds the blade carrier 5 at its the peeled solids 15 side facing away from a gas connection, which is via channels (not shown) with a gas outlet nozzle 9 at the peeled solids facing side of the blade carrier 5 in combination.
  • the gas outlet nozzle is designed such that it passes the gas supplied via the gas connection 7 as a gas stream over the surface of the knife carrier 5.
  • a gas cushion between the peeled solids 15 and the surface of the blade carrier is formed, so that the peeled solids 15 can not attach to the surface of the blade carrier.
  • the gas outlet nozzle 9 is formed as a slot which extends over the entire width of the peeling knife 9.
  • the gas outlet nozzle 9 is located between the paring knife 3 and the knife carrier 5. However, it may also be provided in the paring knife 3, and also several nozzles may be provided along the path of the peeled solids 15 along the knife carrier.
  • compressed air is used as the gas, and depending on the purpose of use, other gases, for example inert gases, can also be used.

Landscapes

  • Centrifugal Separators (AREA)

Claims (15)

  1. Dispositif destiné à racler un dépôt solide sur la paroi intérieure d'un tambour de centrifugeuse (1), comportant un dispositif racleur (3, 5, 21), ledit dispositif racleur (3, 5, 21) comportant un couteau racleur (3), un porte-couteau (5), une admission de gaz (7) et au moins un orifice de sortie du gaz (9), caractérisé en ce que l'orifice de sortie du gaz (9) est agencé sur le porte-couteau (5), de telle sorte qu'un flux de gaz sortant de l'orifice sortie du gaz (9) forme un matelas de gaz entre les matières solides raclées et au moins une partie de la surface du dispositif racleur (3, 5, 21).
  2. Dispositif selon la revendication 1, caractérisé en ce que le flux de gaz est dirigé parallèlement ou anti-parallèlement à la direction d'évacuation des matières solides raclées.
  3. Dispositif selon la revendication 1, caractérisé en ce que le flux de gaz est projcté en formant un angle entre 0° et 180° avec la direction d'évacuation des matières solides.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il est prévu un orifice de sortie du gaz (9) sur le couteau racleur.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'orifice de sortie du gaz est conçu sous la forme d'une buse unique, d'un système de buses formé par plusieurs buses disposées en ligne ou d'un système de buses en forme de fentes.
  6. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'orifice de sortie du gaz est prévu sur le côté du dispositif racleur (3, 5), opposé au côté d'évacuation, et le dispositif racleur comporte des orifices de sortie du gaz.
  7. Dispositif selon la revendication 6, caractérisé en ce que les orifices de sortie du gaz sont formés par des dents d'un couteau racleur (3).
  8. Centrifugeuse à fonctionnement discontinu comportant un dispositif selon l'une quelconque des revendications 1 à 7.
  9. Procédé de raclage d'un dépôt solide sur la paroi intérieure d'un tambour de centrifugeuse, dans lequel un dispositif racleur est utilisé pour racler les matières solides d'un dépôt solide et pour évacuer les matières solides raclées, le dispositif racleur comportant un couteau racleur (3) et un porte-couteau (5), caractérisé en ce qu'un matelas de gaz est généré à partir d'un flux de gaz entre les matières solides (15) raclées et au moins une partie de la surface du dispositif racleur, orientée vers les matières solides raclées, le gaz étant acheminé par l'intermédiaire d'un orifice de sortie du gaz sur le porte-couteau (5).
  10. Procédé selon la revendication 9, caractérisé en ce que le gaz est guidé directement sur la surface du dispositif racleur.
  11. Procédé selon la revendication 10, caractérisé en ce que le gaz est introduit entre le dépôt solide (13) et le dispositif racleur.
  12. Procédé selon la revendication 11, caractérisé en ce que le gaz est guidé à travers des orifices de sortie de gaz dans le dispositif racleur.
  13. Procédé selon la revendication 11, caractérisé en ce que le dispositif racleur est séparé périodiquement du dépôt solide, de telle sorte qu'un flux de gaz pulsé est généré entre les matières solides raclées et le dispositif racleur.
  14. Procédé selon la revendication 9, caractérisé en ce qu'une buse, derrière le couteau racleur ou à travers le couteau racleur, est conçue de manière à générer un flux de gaz homogène sur toute la longueur de la partie du dispositif racleur, qui est dans le prolongement du couteau racleur dans la direction de production.
  15. Procédé selon la revendication 14, caractérisé en ce que la buse destinée à recevoir le flux de gaz est formée par le couteau racleur et le porte-couteau.
EP20020002472 2001-02-01 2002-02-01 Dispositif pour racler le gateau solide d'une centrifugeuse Expired - Lifetime EP1228807B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10104552 2001-02-01
DE2001104552 DE10104552A1 (de) 2001-02-01 2001-02-01 Vorrichtung und Verfahren zum Abschälen eines Feststoffkuchens aus einer Zentrifugentrommel

Publications (2)

Publication Number Publication Date
EP1228807A1 EP1228807A1 (fr) 2002-08-07
EP1228807B1 true EP1228807B1 (fr) 2006-01-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020002472 Expired - Lifetime EP1228807B1 (fr) 2001-02-01 2002-02-01 Dispositif pour racler le gateau solide d'une centrifugeuse

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EP (1) EP1228807B1 (fr)
DE (2) DE10104552A1 (fr)
ES (1) ES2255585T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1434655B1 (fr) * 2001-10-06 2006-04-26 Guntram Krettek Installation de classification par voie humide
CN105381888A (zh) * 2015-12-04 2016-03-09 广西农垦糖业集团柳兴制糖有限公司 一种制糖工业离心机气刀装置
CN108927299A (zh) * 2018-08-08 2018-12-04 江苏同泽过滤科技有限公司 一种离心机用刮刀机构
CN114602230B (zh) * 2022-03-16 2023-09-19 合肥通用机械研究院有限公司 一种气吹撬动式残留滤饼清除组件
CN114832476B (zh) * 2022-03-16 2023-05-23 合肥通用机械研究院有限公司 具备气吹效应的残留滤饼清除设备及系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR663036A (fr) * 1928-02-16 1929-08-14 T Robatel Atel Perfectionnements aux essoreuses
GB768782A (en) * 1955-04-19 1957-02-20 Stork Koninklijke Maschf Improvements in and relating to continuously operating centrifugal machines
GB860063A (en) * 1959-07-24 1961-02-01 Aktiebolget Landsverk Method and means for the removal of pulp from a centrifugal drum
DE3340636A1 (de) 1983-11-10 1985-05-23 Krauss-Maffei AG, 8000 München Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen
DE4330594C1 (de) * 1993-09-09 1994-09-22 Krauss Maffei Verfahrenstechni Vorrichtung zum Entfernen einer Filterkuchen-Grundschicht
JPH10180143A (ja) * 1996-12-20 1998-07-07 Mitsubishi Kakoki Kaisha Ltd 遠心濾過機のケ−キ掻取除去装置

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Publication number Publication date
ES2255585T3 (es) 2006-07-01
DE50205616D1 (de) 2006-04-06
DE10104552A1 (de) 2002-08-08
EP1228807A1 (fr) 2002-08-07

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