EP0199654A2 - Trockenschleuderkorb für feuchtes körniges Material - Google Patents

Trockenschleuderkorb für feuchtes körniges Material Download PDF

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Publication number
EP0199654A2
EP0199654A2 EP86400897A EP86400897A EP0199654A2 EP 0199654 A2 EP0199654 A2 EP 0199654A2 EP 86400897 A EP86400897 A EP 86400897A EP 86400897 A EP86400897 A EP 86400897A EP 0199654 A2 EP0199654 A2 EP 0199654A2
Authority
EP
European Patent Office
Prior art keywords
basket
supports
basket according
peripheral wall
edge
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
EP86400897A
Other languages
English (en)
French (fr)
Other versions
EP0199654B1 (de
EP0199654A3 (en
Inventor
Pierre Gager
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
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 Charbonnages de France CDF filed Critical Charbonnages de France CDF
Priority to AT86400897T priority Critical patent/ATE51350T1/de
Publication of EP0199654A2 publication Critical patent/EP0199654A2/de
Publication of EP0199654A3 publication Critical patent/EP0199654A3/fr
Application granted granted Critical
Publication of EP0199654B1 publication Critical patent/EP0199654B1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment

Definitions

  • the invention relates to extractors of wet granular material such as, for example, pre-drained coal leaving the washing tanks. More particularly, it relates to a spin basket which contains an entry piece which is attached to it.
  • This part follows a fixed supply line and it rotates at high speed with the spin basket; it receives from this pipe the material to be wrung and it directs this material towards the peripheral and wringing wall of the basket.
  • the entry piece has generally consisted of a truncated cone which is joined and fixed to the bottom of the basket by several supports. This truncated cone receives the material to be wrung by its narrowest circular opening and it directs it onto the wringing wall of the basket through its widest circular opening.
  • the main object of the invention is to greatly reduce or eliminate all the aforementioned drawbacks, by providing a wringer basket having an entry piece whose design is such that wear is considerably reduced if not completely eliminated at the same time that the material to be wrung is rotated more efficiently to a speed little different, if not identical, to that of the wringing basket.
  • the material to be wrung is thrown by centrifugal force against the wringing peripheral wall of the basket; this projection is the cause of rapid wear of this wall.
  • Another object of the invention is also to achieve a wringer basket whose wall is protected against wear and whose service life is significantly increased.
  • a basket according to the invention may have one or the other only of the two retention volumes, but it is greatly preferable that it be provided with the two retention volumes.
  • each retention volume has a substantially triangular cross-section profile and the material which is contained therein during operation forms a natural slope of decreasing thickness parallel to the axis XX.
  • the material which arrives and which circulates through the basket successively meets the material contained in each of the retention volumes, which effectively protects against wear the entry piece on the one hand and the peripheral wall of somewhere else ; in addition, the significant friction which takes place between the material which comes through the fixed pipe and the continuous material in the retention volume situated on the entry piece in the impact zone results in a good rotational drive of the material before its projection against the wringing peripheral wall; this results in a better distribution of the material and a notable weakening of the vibrations.
  • the entry piece comprises on the one hand a crown arranged coaxially with the spin basket in a plane substantially perpendicular to the axis of the latter with an edge inner device intended to surround in a wringer the inlet pipe of the material to be wrung and an outer peripheral edge, on the other hand a cylindrical wall extending in the direction of flow of the material to be wrung from a place on said crown spaced from its inner peripheral edge, preferably from its outer peripheral edge.
  • the supports of the entry piece are fixed, on the one hand to the cylindrical wall of this entry piece, on the other hand to the peripheral wall of the basket.
  • the ratio between the width in the radial direction of the crown and the length in the longitudinal direction of the cylindrical wall determines the slope of the slope of material which remains in the retention volume. This ratio must be adjusted according to the nature of the material to be wrung, so that the rotational drive of the flowing material by friction on the material contained in the retention volume is suitable.
  • the supports for fixing the entry piece to the basket are located downstream of said edge and of the projection area.
  • an annular partition is arranged in a substantially transverse plane downstream of this same edge and of the projection area, with an outer peripheral edge in contact with the peripheral wall of the basket and an inner peripheral edge spaced from the cylindrical wall of the entry room.
  • This transverse partition limits a second annular retention volume intended to extend to the projection area and to contain part of the material to be wrung so that the material in circulation is projected onto the material retained.
  • This transverse partition can be fixed directly to the peripheral wall of the basket; as it is not desirable to reduce the wringing useful length of the peripheral wall of the basket, it is preferable to place the transverse partition as close as possible downstream from the projection area and from the annular free edge defined above.
  • the transverse partition limiting the second retention volume is a flat crown arranged in a plane perpendicular to the axis of the spin basket between the annular free edge and the supports.
  • this flat crown is backed by the supports.
  • the material to be wrung is brought into the basket by means of a bent pipe 1, which is fixed, and which feeds an inlet part 2.
  • the entry piece 2 is constituted by a metal truncated cone, of axis XX 'joined and fixed by several supports 3 to the bottom 4 of the spinning basket which rotates at high speed (450 rpm) around XX '.
  • This basket has a frustoconical peripheral and wringing wall 5 which has a multitude of small width openings. It rotates inside a fixed casing 6 to which the pipe 1 is itself fixed by its opening 7.
  • the material is pre-drained granular carbon from the coal fines washing tanks. It flows by gravity in line 1 to the center of the basket.
  • the material comes into contact in an impact zone 9 with the input part 2, which rotates at high speed with the basket.
  • This part 2 in a truncated cone exerts only a very low friction force on the material; the circumferential speed setting thereof is therefore insufficient.
  • the main result is that the material is distributed in packages in the basket.
  • the supports 3 which rotate with the basket strike the material and disperse it in a disorderly manner. All of this results in vibrations of the basket and poor spin conditions.
  • the wringer basket has three zones of significant and rapid wear: the truncated cone 2 itself, the supports 3 and a projection zone 10 of the wall. peripheral 5 of the basket, where the material is projected by centrifugal force when it leaves the input part 2, with an insufficient circumferential speed relative to that of the basket.
  • the material then travels along the entire length 11 of its peripheral wall: the fine wrung out evacuates downwards at 13, while the water and the schlamms pass through the basket over the entire surface of the wringer 5, as indicated by arrows 12, and are then discharged through an opening (not shown) formed in the casing 6.
  • FIG. 2 to describe a wringer basket according to the invention.
  • the same references have been used as in FIG. 1 to designate the identical parts of the wringer basket not modified by the invention.
  • new reference numerals have been used to designate the parts or parts of new parts in accordance with the invention.
  • the entry piece produced in the spirit of the invention comprises a flat crown 14 arranged in a transverse plane perpendicular to the axis XX 'of the wringer basket.
  • This crown is made of sheet metal with a thickness of 10 mm; it has an inner peripheral edge 14A by which it surrounds the fixed duct 1 and an outer peripheral edge 14B. From this outer edge 14B, a cylindrical wall 15, also made of 10 mm sheet, extends concentrically to the axis XX 'in the direction of the bottom 4 of the basket, but it is interrupted before reaching it.
  • Peripherally spaced supports 16 extend radially with respect to the axis XX 'between the outer face of the cylindrical wall 15 and the peripheral wall 5 of the basket.
  • This flat crown 17 has an outer peripheral edge 17A which is in contact with the peripheral wall 5 of the basket and an inner peripheral edge 17B which is widely spaced from the cylindrical wall 15. Provision may be made to directly weld the flat crown 17 to the wall device 5 of the basket; but it can also be welded to the supports 16 so that it forms part of the entry piece so that it is put in its place by its outer edge 17A against the peripheral wall 5 when the entry piece is itself inside the basket.
  • the supports 16 are fixed with bolts (not shown) to the peripheral wall 5 of the basket, so that this entry piece can be easily replaced.
  • the cylindrical wall 15 ends with a free circular edge 15A which faces the bottom 4 of the basket.
  • the supports 16 and the flat crown 17 are set back relative to this free edge 15A, in the direction of the flow of the material.
  • the basket according to the invention comprises two retention volumes of the material to be wrung, which greatly reduce, if it does not remove it, the wear of the most exposed areas and which improve the rotation of this material before it reaches the basket, as will be explained now.
  • part of the material which arrives via the fixed duct 1 remains contained in the annular volume 18, with a triangular cross section, limited by the flat crown 14 and by the cylindrical wall 15.
  • the material Passing over the free circular edge. 15A, the material is projected onto the cylindrical wall 5 of the basket in an area which is the projection area 10 on the conventional basket of FIG. 1. Due to the existence of the transverse flat crown 17, part of the material which travels along the cylindrical wall 5 remains contained in the annular volume 20 limited by this cylindrical wall 5 and by the crown 17. In this retention volume the material forms an annular slope on the surface 21 of which the incoming material is projected in the basket ; then the material overflows above the crown 17 and continues its progression along the wringing peripheral wall 5.
  • the material is wrung out over the entire surface of the wall 5 of the basket: the fine wrung out evacuates downwards at 22, while the water and the schlamms exit according to the arrows 23 and are then evacuated by an opening of the casing 6 (not shown).
  • the natural slope of material contained in the retention volumes during operation receives the shock of the flowing material, which has two advantages: on the one hand, the entry piece hardly wears out, and on the other On the other hand, the high friction between the flowing material and the contained material causes a regular distribution in the basket of the flowing material which quickly reaches a notable circumferential speed. This avoids the formation of bundles of material, vibrations of the basket, and improves the wringing conditions.
  • wringer of the invention illustrated in FIG. 2 a reduction of 1% to 2% was obtained in the moisture content of the product collected. at the outlet 22, and a very regularity of this content in comparison with the same product wrung in the conventional basket of FIG. 1.
  • Another important advantage of the invention is that the shocks of the flowing material against the supports 16 according to FIG. 2 are much less brutal than against the supports 3 of a conventional basket like that of FIG. 1, because the new position of these supports 16 and the best circumferential speed setting of the flowing material, mean that the rotational speeds of the material and the supports are not very different when the shocks occur. It follows, on the one hand, that the supports 16 of an entry piece according to the invention wear out much less quickly than the supports 3 in a conventional basket, and on the other hand, that these shocks do not more cause a disorderly and uneven dispersion of the material, which hampered a good spin with conventional dryers.
  • Another important advantage of the invention results from the formation of the second retention volume 20 created by the transverse crown 17. Thanks to the presence of the ring of material which receives the projected material, a spinning basket conforming to the he invention has a service life more than doubled compared to a conventional basket.
  • the main advantages. of the invention are: a gain in the quality and regularity of the spin, a gain in the service life of the input part, and a gain in the service life of the spin basket.
  • the extractors equipped with a basket according to the invention are particularly advantageous for treating the products of washing trays for carbon fines. But they can also be applied advantageously to most industrial products to be wrung.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Centrifugal Separators (AREA)
  • Drying Of Solid Materials (AREA)
EP86400897A 1985-04-26 1986-04-24 Trockenschleuderkorb für feuchtes körniges Material Expired - Lifetime EP0199654B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86400897T ATE51350T1 (de) 1985-04-26 1986-04-24 Trockenschleuderkorb fuer feuchtes koerniges material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8506402A FR2580955B1 (fr) 1985-04-26 1985-04-26 Panier d'essoreuse centrifuge pour matiere granuleuse humide
FR8506402 1985-04-26

Publications (3)

Publication Number Publication Date
EP0199654A2 true EP0199654A2 (de) 1986-10-29
EP0199654A3 EP0199654A3 (en) 1988-09-21
EP0199654B1 EP0199654B1 (de) 1990-03-28

Family

ID=9318727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400897A Expired - Lifetime EP0199654B1 (de) 1985-04-26 1986-04-24 Trockenschleuderkorb für feuchtes körniges Material

Country Status (9)

Country Link
US (1) US4682423A (de)
EP (1) EP0199654B1 (de)
JP (1) JPS61250484A (de)
AT (1) ATE51350T1 (de)
AU (1) AU577758B2 (de)
CA (1) CA1274186A (de)
DE (1) DE3669833D1 (de)
FR (1) FR2580955B1 (de)
ZA (1) ZA863033B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155923A (en) * 1990-01-11 1992-10-20 Blaw Knox Food & Chemical Equipment Company Apparatus and process for conditioning particulate material
US5068979A (en) * 1990-01-11 1991-12-03 Blaw Knox Food & Chemical Equipment Company Apparatus for conditioning particulate material
US5230281A (en) * 1991-07-10 1993-07-27 Blaw Knox Food & Chemical Equipment Co. Apparatus for roasting coffee beans or the like
GB9519248D0 (en) * 1995-09-21 1995-11-22 Mud Recovery Systems Ltd A method of recovering drilling muds

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL196699A (de) * 1954-05-15
FR1154064A (fr) * 1957-01-10 1958-04-02 Wintershall Ag Perfectionnements aux essoreuses centrifuges à poussoir, résistant à l'usure
DE1080028B (de) * 1959-02-27 1960-04-14 Krupp Dolberg G M B H Schub- oder Schneckenzentrifuge
US3970257A (en) * 1972-10-05 1976-07-20 Macdonald George James Apparatus for reducing the size of discrete material
US3834631A (en) * 1973-04-18 1974-09-10 T King Spin breaking process
US3831764A (en) * 1973-06-05 1974-08-27 Pennwalt Corp Pusher-type centrifuge
IT1228409B (it) * 1983-12-12 1991-06-14 Cam Srl Impianto per l'essiccamento della tornitura o rottami prima del loro utilizzo nei forni fusori e per il trattamento di rifiuti ed altri materiali di scarto
DE3616564A1 (de) * 1986-05-16 1987-11-19 Krupp Gmbh Fuellvorrichtung fuer einen roehrentrockner

Also Published As

Publication number Publication date
JPS61250484A (ja) 1986-11-07
EP0199654B1 (de) 1990-03-28
FR2580955A1 (fr) 1986-10-31
AU5681086A (en) 1986-10-30
CA1274186A (fr) 1990-09-18
ZA863033B (en) 1986-12-30
ATE51350T1 (de) 1990-04-15
EP0199654A3 (en) 1988-09-21
FR2580955B1 (fr) 1989-11-03
DE3669833D1 (de) 1990-05-03
US4682423A (en) 1987-07-28
AU577758B2 (en) 1988-09-29

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