EP0142698A2 - Procédé et dispositif pour le déchargement pneumatique de centrifuges - Google Patents
Procédé et dispositif pour le déchargement pneumatique de centrifuges Download PDFInfo
- Publication number
- EP0142698A2 EP0142698A2 EP84112276A EP84112276A EP0142698A2 EP 0142698 A2 EP0142698 A2 EP 0142698A2 EP 84112276 A EP84112276 A EP 84112276A EP 84112276 A EP84112276 A EP 84112276A EP 0142698 A2 EP0142698 A2 EP 0142698A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- discharge
- connection housing
- centrifuge
- drying
- 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
Links
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
Definitions
- the invention relates to a method for emptying centrifuges, in particular vertical centrifuges, in which the centrifuged product is released into a discharge pipe through the closed centrifuge housing by peeling off the wall of the rotating centrifugal drum, and in the heated drying gas in a primary stream into the centrifuge and into a secondary stream is passed into a drying section connected to the discharge pipe and carrying the product-gas mixture.
- the gas-tight centrifuge housing of a centrifuge to be emptied is included in a closed delivery circuit by passing heated drying gas into the centrifuge by means of a pressure line and ver with a peeling head see discharge pipe to a suction line, in order to then feed the product, which is conveyed out of the centrifuge by means of a gas circulation device, through a drying section to a cyclone filter bunker.
- the sensitive or poisonous product which may need to be kept sterile, is peeled out of the centrifugal drum and conveyed within a closed circuit without the volatile solvents coming into contact with the ambient air during this processing.
- this method it is proposed to connect the outlet of the heating device arranged in the closed conveyor circuit for reheating the drying gas cooled in the condenser directly to the suction line via a shunt line, so that the centrifuge is partially bypassed.
- This type of gas routing should be used with relatively wet centrifugal products that tend to stick to start drying during the peeling and discharge process.
- the invention is based on the object of further developing and improving the above-mentioned method for emptying centrifuges in such a way that baking of the product to be conveyed within the discharge pipe or in the subsequent transport line is avoided to a large extent and, furthermore, by reducing the outlay on equipment Shortening the necessary drying tube length is made possible.
- drying gas carried in the secondary flow is transferred from the combination with the product-gas mixture conveyed through the discharge pipe into a turbulent longitudinal flow which essentially concentrically envelops the discharge pipe up to its downstream end.
- the amount of drying gas introduced in the secondary flow which concentrically surrounds the product-gas mixture as it emerges from the discharge pipe, ensures intensive swirling, so that the greatest possible exchange takes place between the hot drying gas and the product moisture. This process can roughly be compared to the principle of atomization drying, which also considerably shortens the length of the tube that is otherwise required for drying the current.
- the invention also relates to a pneumatic discharge device, in particular for a vertical centrifuge, for carrying out the above-described method according to the invention.
- a discharge device in accordance with DE-PS 20 56 893 already mentioned at the outset, with a discharge tube which is movable in a centrifuge centrifuge drum and provided with a peeling head at the preceding end, a centrifuge housing which is involved in a pneumatic conveying circuit and a connection housing which is arranged thereon in a sealed manner, in which the discharge pipe is guided and radial and axial adjustment devices for the discharge pipe are arranged.
- the pneumatic discharge device that the discharge pipe carries the drying gas guided in the secondary flow before being combined with the one through the discharge pipe conveyed product-gas mixture is transferred into a turbulent longitudinal flow that essentially concentrically envelops the discharge pipe up to its downstream end.
- connection housing Since the cladding tube for the secondary flow of the drying gas is flanged directly to the rear end of the connection housing and passes downstream into the drying section, the upper or downstream end of the connection housing is sealed off from the ambient atmosphere. This fact is used according to the invention to lead the connection pipe through the entire connection housing without interruption or telescopic extension and, in particular at the downstream end, to pass through the free end of the connection housing in a sealed manner and to protrude into the sleeve tube.
- the drying tube leading to the cyclone bunker filter would have to be rigidly and statically sealed for sealing reasons inserted into the upper end of the connection housing and combined with a telescopically displaceable discharge tube so as to ensure the necessary freedom of movement for adjusting the discharge tube and the peeling elbow connected there, ie both the longitudinal movement and the rotational movement of the discharge tube.
- the inevitably resulting diameter widening between the discharge pipe and suction line connection in such an arrangement leads to an undesirable gas turbulence at this point and to caking of the product on the pipe walls. The caking movements of the discharge tube are blocked by such caking.
- the discharge tube can be finely ground and polished on the outside and can be sealed with a seal arranged at the upper end of the connection housing.
- This seal and the finely ground circumference of the discharge tube have the further advantage that the annular space formed with the cladding tube can be kept free with the aid of the secondary flow of the drying gas, otherwise resulting from a diameter Extending the existing risk of product dust falling backwards.
- the subsequently added drying gas flows upwards concentrically to the inner discharge pipe and swirls the product-gas mixture coming out of the discharge pipe for the purpose of additional intensive drying.
- the cladding tube for the secondary stream of drying gas in a concentric arrangement can in principle also be used with a delivery tube rigidly attached to the upper end of the connection housing if, for other reasons, the advantageous configuration of the connection housing with the continuous discharge tube can be dispensed with .
- the insertion socket be connected laterally to the cladding tube directly behind the free end of the connection housing. This ensures that the secondary flow in every case keeps the lower end of the annular space in the cladding tube free of product deposits and thus also the passage and sealing of the discharge tube.
- the inlet connection for the secondary flow of the drying gas can be connected to the casing tube essentially perpendicular to the axis of the latter, in order to achieve concentric guidance of the secondary flow even over a small axial length. If required for other reasons, the inlet connector can also be inclined and / or connected tangentially to the cladding tube.
- an end plate can be held between the free end of the connection housing and a fastening flange of the cladding tube, which contains a sealing passage for the discharge tube and which defines the annular space formed between the discharge tube and the cladding tube in the axial direction up to the mouth of the insertion socket fills out.
- the cover plate is thus used to avoid dead spaces or to place the bushing in its place.
- the discharge pipe be surrounded within the connection housing at a concentric distance by an immersion pipe, the preceding end of which is connected to the discharge pipe and is guided in a sealed manner at least in the region of the upstream end of the connection housing.
- the outer circumference of the immersion tube can be guided both by an adjusting ring supported between the ends of the connection housing and by a sliding ring arranged at the front end of the connection housing.
- a sealed centrifuge housing in which a centrifugal drum 12 is rotatably mounted, is supported on a centrifuge frame 14.
- a connection housing 16 On the top of the sealed centrifuge housing 10, a connection housing 16 is fastened in a sealed manner, the details of which are explained below in connection with FIGS. 2 and 3.
- a rotatable and height-adjustable discharge pipe is guided, the lower end of which continues into a pipe bend and a peeling head on which peeling knives are arranged laterally and below. Due to the sensitive radial and axial adjustment of the discharge tube with the elbow, 10 very thin product layers can be removed from the centrifugal drum, which is driven at an appropriate speed, for the purpose of centrifuge emptying when the centrifuge housing is closed.
- the peeling process is accompanied by a pneumatic conveying, wherein drying gas heated up via a primary flow branch 52 shown in FIG. 1 is introduced into the centrifuge housing and the discharge pipe is connected to a pneumatic suction line.
- Fig. List the centrifuge in a pneumatic conveyor circuit, which includes successive units and assemblies.
- a cladding tube 18 At the upper end of the connection housing 16 there is a cladding tube 18, which is described in more detail below, and by means of an unspecified compensating piece there is a drying tube section 20 in which the peeled product is extracted with the help of the drying gas before the residual moisture is removed via a cyclone separator 22 a filter 24 arranged therein falls dry into a bunker 26.
- the bunker 26 is equipped as a mixing container with a screw mixer 28.
- the conveying circuit continues via the suction line 30, a safety filter 32 into a condenser 34, where the carrier medium is freed from the solvent vapors carried along.
- a droplet separator 36 is connected downstream.
- the delivery cycle continues with a high-pressure fan 38 and a measuring and metering device with which the remaining solvent content of the carrier medium can be adjusted. So that the ignitability of the mixture remains low and a 0 2 content remains less than about 6%, an N 2 supply is provided as required.
- the pressure line 42 continues into a heating device 44, which can consist of a heat exchanger.
- a bypass line 46 and a downstream mixing valve 48 enable sensitive temperature control of the drying gas which is now prepared for product treatment and which still flows through a safety filter 50.
- the heated drying gas is divided into a primary stream conducted into the centrifuge via a primary branch 52 and a connection 66 on the centrifuge housing 10, and into a secondary stream leading to the cladding tube 18 via a secondary branch 54.
- the split ratio is, for example, 1: 3.
- connection housing 16 fastened on the centrifuge 10 in FIG. 2 allows it to be divided into a lower one for reasons of simplified production, maintenance and repair Recognize section 68, a central section 70 and an upper section 72.
- a discharge tube 60 extends through the connection housing 16, the lower end of which extends into a bend 62, to which a peeling head 64 with an enlarged opening is fastened, from which a lateral peeling knife edge 66 can be seen.
- the discharge tube 60 is connected to a dip tube 76 of larger diameter via a lower flange connection 74.
- the immersion tube 76 extends essentially up to the upper inner end of the connection housing, so that a sufficient support length remains within the connection housing in the extended state.
- the dip tube 76 is guided on its circumference in the region of the lower end of the connection housing at 78 on both sides of a seal 80 free of gas and dust.
- a support ring 84 is clamped, on which an adjusting ring 86 is supported and rotatably supported on the circumference.
- Support ring 84 and adjusting ring 86 include the immersion tube 76 with bearing play, so that with respect to the lower guide 80 in the connection housing there is a favorable large distance between the bearings or guides of the support tube.
- a feather key 88 is attached to the circumference of the dip tube 76, which extends through a recess 90 in the adjusting ring 86 and serves as a driver connection between the adjusting ring and the dip tube.
- the adjusting ring 86 is provided over a part of its circumference with a circumferential toothing 92 which is in engagement with a rack 94.
- the rack 94 forms part of a piston rod 96 of a hydraulic .
- likzylinders 98 and is provided with pistons 100, 102 at both ends. If the cylinder 98 is acted on at one of its ends in accordance with FIG.
- the adjusting ring 86 is rotated by the movement of the piston rod until the radius running through the center of the parallel key 88 is in the axis 82. In this position, the parallel key 88 is aligned with a recess 104 in the supporting ring located underneath and can now be moved downwards.
- a drive cylinder 110 is supported in the connection housing 16 on the adjusting ring 86 in an arrangement parallel to the axis of the discharge tube, the piston rod of which protrudes through openings in the adjusting ring and the supporting ring and is articulated with a piston rod eye 108 on a driving lug 106 attached to the dip tube 76.
- 2 shows a proximity switch 112 and sensor marks 114 assigned to it on the feather key 88, which emits signals for the operator in the end positions of the longitudinal adjustment.
- the discharge tube 60 is through an opening in the upper portion 72 of the connector housing 16th extended into the cladding tube 18 and forms with it an essentially concentric annular space 118.
- the length of extension of the discharge tube 60 upwards from the connection housing 16 is determined approximately according to the vertical adjustment stroke corresponding to the drive cylinder 110 in order to be able to completely empty the centrifugal drum, as well as after additional remaining length. This is indicated in Fig. 2 with broken line 124 and ensures that the discharge tube 60 is still surrounded in the extended end position with an annular space 18 before the secondary flow of the drying gas, which is led through the inlet pipe 120 connected to the cladding tube 18, that can reach product-gas mixture emerging from the upper end of the discharge pipe.
- the cladding tube 18 is connected with its lower flange 122 to the connection housing 16 in a sealed manner on an end plate 116, for example made of PTFE plastic.
- the end plate 116 extends upwards into the annular space 118 until it is approximately flush with the lower edge of the insertion piece 120.
- the end plate thus forms an axially extended guide and seal for the ground and polished outer circumference of the discharge tube 60.
- the upper flange 126 of the cladding tube 18 connects to the z.
Landscapes
- Centrifugal Separators (AREA)
- Drying Of Solid Materials (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT84112276T ATE29224T1 (de) | 1983-11-10 | 1984-10-12 | Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833340636 DE3340636A1 (de) | 1983-11-10 | 1983-11-10 | Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen |
| DE3340636 | 1983-11-10 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0142698A2 true EP0142698A2 (fr) | 1985-05-29 |
| EP0142698A3 EP0142698A3 (en) | 1986-03-26 |
| EP0142698B1 EP0142698B1 (fr) | 1987-09-02 |
Family
ID=6213939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84112276A Expired EP0142698B1 (fr) | 1983-11-10 | 1984-10-12 | Procédé et dispositif pour le déchargement pneumatique de centrifuges |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4631048A (fr) |
| EP (1) | EP0142698B1 (fr) |
| AT (1) | ATE29224T1 (fr) |
| CA (1) | CA1238029A (fr) |
| DE (1) | DE3340636A1 (fr) |
| IN (1) | IN160328B (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4004459C2 (de) * | 1990-02-14 | 1995-08-31 | Westfalia Separator Ag | Verfahren zum Betreiben einer Zentrifuge mit einer selbstentleerenden Schleudertrommel und Zentrifuge zur Durchführung des Verfahrens |
| DE4013388A1 (de) * | 1990-04-26 | 1991-10-31 | Titus Hans Joachim | Zentrifugen-trockner |
| US5087127A (en) * | 1990-07-05 | 1992-02-11 | Benjamin Knelson | Removal of concentrate from a centrifugal separator |
| DE4410442C2 (de) * | 1994-03-25 | 1999-04-08 | Dommer Manfred | Vorrichtung zur Reduzierung des Volumens und des Gewichts von Küchenabfällen und Speiseresten |
| DE19635346C1 (de) * | 1996-08-31 | 1998-03-26 | Wienicke Heinz Juergen | Diskontinuierliche Filterzentrifuge mit einer Trocknungsvorrichtung für das schleuderfeuchte Gut |
| DE10104552A1 (de) | 2001-02-01 | 2002-08-08 | Krauss Maffei Verfahrenstechni | Vorrichtung und Verfahren zum Abschälen eines Feststoffkuchens aus einer Zentrifugentrommel |
| DE10104553A1 (de) * | 2001-02-01 | 2002-11-14 | Krauss Maffei Verfahrenstechni | Vorrichtung zum Abschälen und Austragen eines Feststoffs aus einer Zentrifuge |
| DE10256674A1 (de) | 2002-12-04 | 2004-06-17 | Baumann-Schilp, Lucia | Kombinierte Entfeuchtung, Trocknung und Korngrößensteuerung von Feststoffen |
| CN106807310B (zh) * | 2017-02-24 | 2018-12-14 | 四川弘博新材科技股份有限公司 | 一种电爆炸法制取纳米粉末的设备 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1321288A (en) * | 1919-11-11 | of little falls | ||
| US2215624A (en) * | 1937-07-16 | 1940-09-24 | Laval Separator Co De | Process of removing impurities from vegetable oils |
| US2488747A (en) * | 1946-08-10 | 1949-11-22 | Laval Separator Co De | Starch separation |
| US2720313A (en) * | 1951-12-03 | 1955-10-11 | Garrett Corp | Liquid purification system |
| DE948497C (de) * | 1954-09-08 | 1956-08-30 | Krauss Maffei Ag | Kontinuierlich arbeitende Zentrifuge mit einer nachgeschalteten heissgas- oder heissdampfbetriebenen Trockeneinrichtung |
| DE1432886A1 (de) * | 1964-03-03 | 1969-10-23 | Titus Hans Joachim | Verfahren zum Ausraeumen von Vertikal-Zentrifugen |
| DE1782367C3 (de) * | 1966-03-24 | 1974-02-28 | Krauss-Maffei Ag, 8000 Muenchen | Vorrichtung zum Entfernen des Feststoffes aus einer Zentrifuge. Ausscheidung aus: 1298448 |
| FR206069A (fr) * | 1970-06-09 |
-
1983
- 1983-11-10 DE DE19833340636 patent/DE3340636A1/de active Granted
-
1984
- 1984-08-21 IN IN579/CAL/84A patent/IN160328B/en unknown
- 1984-10-12 EP EP84112276A patent/EP0142698B1/fr not_active Expired
- 1984-10-12 AT AT84112276T patent/ATE29224T1/de not_active IP Right Cessation
- 1984-10-18 US US06/662,020 patent/US4631048A/en not_active Expired - Fee Related
- 1984-10-26 CA CA000466406A patent/CA1238029A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4631048A (en) | 1986-12-23 |
| DE3340636A1 (de) | 1985-05-23 |
| EP0142698B1 (fr) | 1987-09-02 |
| EP0142698A3 (en) | 1986-03-26 |
| DE3340636C2 (fr) | 1987-06-19 |
| CA1238029A (fr) | 1988-06-14 |
| IN160328B (fr) | 1987-07-04 |
| ATE29224T1 (de) | 1987-09-15 |
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