US3763572A - Method and apparatus for pneumatically discharging a drum centrifuge - Google Patents

Method and apparatus for pneumatically discharging a drum centrifuge Download PDF

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Publication number
US3763572A
US3763572A US00151231A US3763572DA US3763572A US 3763572 A US3763572 A US 3763572A US 00151231 A US00151231 A US 00151231A US 3763572D A US3763572D A US 3763572DA US 3763572 A US3763572 A US 3763572A
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United States
Prior art keywords
centrifuge
solid matter
carrier medium
housing
conduit system
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
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US00151231A
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English (en)
Inventor
H Titus
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Mannesmann Demag Krauss Maffei GmbH
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Individual
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Assigned to KRAUSS-MAFFEI AG, A WEST GERMAN CORP. reassignment KRAUSS-MAFFEI AG, A WEST GERMAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TITUS HANS-JOACHIM
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
    • 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 methods and apparatus for discharging solid material from centrifuges, and in particular to a method and apparatus for pneumatically discharging a drum centrifuge.
  • the invention therefore suggests a pneumatic discharge method and apparatus where the discharge operation is automatically and precisely controlled and where the removed product is immediately dried and separated, while the entire amount of solvent used is reclaimed.
  • the discharge device itself is preferably an explosion-proof structure, so that the use of flammable solvents does not require the previously necessary expensive oxygen monitoring system.
  • the invention thus suggests a discharge apparatus in combination with a gas-tight centrifuge housing which contains a scraper head movably arranged therein, including means to control the position of the discharge pipe. It further includes a suction pipe which communicates with the discharge pipe in a telescopic joint, a gas circulation pump with a product separator arranged ahead of the pump.
  • the device thus presents a closed circulatory system, whereby the gas circulation pump communicates on the one side, via a condenser and an upstream heater, with the housing of the centrifuge, while on the other side it leads, via a product separator and a drying line, to the suction pipe of the discharge device.
  • FIG. 1 shows a schematic layout of a circulatory discharge system representing an embodiment of the invention
  • FIG. 2 shows a modified portion of the embodiment represented in FIG. 1;
  • FIG. 3 shows the portion of FIG. 2 in a further modification
  • FIG. 4 represents a vertical cross-section through a condenser apparatus as used in the circulatory system of the invention
  • FIG. 5 represents a horizontal cross-section through the condenser apparatus of FIG. 4.
  • FIG. 6 shows in an i,x-graph the ratios between acetone and nitrogen
  • FIG. 7 shows in an i, x-graph the ratios between methanol and nitrogen.
  • the cover 10 of a centrifuge 11 carries a scraper housing 14 inside which is mounted on a rotatable and height-adjustable discharge tube 12 therefor having a scraper head 112a, the discharge tube in turn therefor being telescopically guided inside a stationary suction pipe 13.
  • the suction pipe 13 leads to a drying line 31.
  • the fact that the discharge pipe 12 is guided clearance-free and its radial and axial adjustments are controllable to a high accuracy makes possible the peeling of very thin product layers from the centrifuge to facilitate the drying of the product.
  • the scraping operation is controlled automatically by means of hydraulic drives and electric end switches.
  • the solid matter (product) which remains inside the drum I5 is peeled off the drum wall at speeds of 50-200 rpm and removed pneumatically.
  • the dried product is separated from the conveying gas in a cyclone separator 32, from where the conveying gas is forced back into the centrifuge 11 by means of a blower 33.
  • the carrier medium After passing through the heater 35 (heat exchanger), the carrier medium enters into the centrifuge housing where it entrains the product which is continuously being peeled from the drum, conveying it through the drying line 31.
  • the carrier gas after the product has been removed in the cyclone separator, remains enriched with solvent when it passes through the high pressure blower into a condenser apparatus 34.
  • a tube filter between the cyclone separator and the blower.
  • the condenser has the purpose of removing the solvent from the carrier gas, thereby restoring to the carrier gas its capacity to absorb the solvent which is released from the peeled off product during the process. After leaving the condenser, the carrier gas is reheated in the heat exchanger 35 from where it passes back into the centrifuge.
  • FIGS. 2 and 3 are shown two different versions of gas conduit systems, adapted to varying temperature sensitivities of different products.
  • the system part shown in FIG. 2 is suitable for comparatively wet products with a tendency of caking to the walls, while FIG. 3 shows a version suitable for the conveyance of temperature sensitive products.
  • the additional line 37 represents a bypass line with respect to the pressure line 36 which leads into the centrifuge, conveying heated carrier gas in the case of FIG. 2, while conveying cold carrier gas in the case of FIG. 3.
  • the drying operation can be laid out and calculated by referring to the graphs shown in FIGS. 6 and 7 which represent i,x-graphs for two conventional solvents, using nitrogen as a carrier medium.
  • the drying triangle represents the following changes in physical state:
  • the distance AX on the abscissa shows the evaporated and reclaimed amount of solvent per kilogram of nitrogen.
  • the solvent content of the gas in the original state (I) can be fixed at random. The invention suggests that this point be fixed in such a way that it is always situated about the ignition range, so as to offer the following cost saving advantages:
  • the condenser 34 of the invention includes several condensation zones, thereby precluding any contamination, while preventing the undesirable formation of an insulating film of condensate on the cooling pipes.
  • the condenser 34 of FIGS. 4 and 5 has an elongated housing with connecting flanges and 41 on its ends.
  • the cooling surfaces are formed by pipes 43 which have a flattened cross-section and through which flows the coolant in a counter current.
  • the cooling pipes are arranged in groups in upright orientation, forming an angle of approximately 45 to the longitudinal center axis of the condenser.
  • the cooling pipes are welded into upper and lower pipe panels 49 and 50 which represent the upper and lower boundaries of the gas flow channels 43.
  • baffle panels 51 which guide the flow of the coolant cross-wise and in opposite direction to the flow direction of the gas.
  • Each cooling pipe includes on its downstream end a separator lip 47 which collects the condensate as well as the residual dust.
  • the shape of the separator lip is such that it creates a low pressure zone which facilitates the removal of the condensate.
  • a pipe 52 From the lower end of each of these curved separator lips 47, extends a pipe 52, as shown in the plan view of FIG. 4.
  • This pipe 52 extends from the condenser housing 42 into a solvent-containing receptacle 54, in order to prevent any bypass flow of the gas which could be caused by the pressure differential of approximately 300 Torr. over the length of the condenser.
  • the gas flow speed of between 6 and 15 m/s determines the cross-section of the condenser as well as the required cooling surface and thus the number of pipe groups.
  • a drainage valve 16 In the pressure line 36 (FIG. 1) immediately following the blower is also arranged a drainage valve 16 together with an outlet 17. Further downstream behind the valve 16 is arranged an intake line 18 for inert gas which is used to scavenge the air contained in the circulation system prior to the start-up of operation.
  • a device for pneumatically discharging solid matter from a drum centrifuge comprising in combination:
  • conduit system originating and terminating inside the centrifuge housing for circulating a contained carrier medium; the conduit system comprising:
  • the evaporating means includes a heater for the carrier medium to permit heat-drying of the solid matter during conveyance inside a portion of said conduit system downstream of the drum centrifuge.
  • the portion of said conduit system between the heater and the centrifuge including a bypass conduit leading to a portion of said conduit system downstream of the centrifuge so that only a portion of the heated carrier medium passes through the centrifuge.
  • portion of said conduit system upstream of the centrifuge housing includes a bypass conduit leading to a portion of said conduit system downstream of the centrifuge scraping means, the heater for the carrier medium being arranged in the bypass conduit, so that the heated carrier medium bypasses the centrifuge.
  • the scraping means includes a scraper housing mounted on the centrifuge housing, a movable discharge tube extending from the scraper housing into the drum of the centrifuge, a scraper head attached to the discharge tube and movable with the latter radially and axially relative to the drum, and a stationary suction tube with a telescopic connection to the movable discharge tube, the suction tube continuing downstream into the conduit system.
  • the solid matter separating means includes a cyclone-type separator and collection bunker in the conduit system downstream of the portion of said conduit system where the solid matter is dehumidified.
  • the humidity separating means includes a condenser arranged between the solid matter separating means and the centrifuge housing, the condenser including:
  • an elongated condenser housing with an intake and outlet for the carrier medium as well as an independent intake and outlet for a coolant fluid;
  • each coolant pipe having a curved profile to catch the droplets of condensate forming in the passing carrier medium.
  • coolant pipes are arranged in groups of parallel pipes with flow channels therebetween, the pipe groups being mounted in upper and lower pipe panels located at a distance from the respective condenser housing walls; the condenser further including baffle panels arranged alternately between the upper and lower pipe panels and the adjacent condenser wall, thereby causing an alternately rising and falling flow of coolant through the successive groups of coolant pipes.
  • a method of discharging and processing the solvent-prepared solid matter from a drum centrifuge including the steps of:

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  • Drying Of Solid Materials (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Centrifugal Separators (AREA)
US00151231A 1970-06-09 1971-06-09 Method and apparatus for pneumatically discharging a drum centrifuge Expired - Lifetime US3763572A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2056893A DE2056893C3 (de) 1970-06-09 1970-06-09 Pneumatische Austragvorrichtung für eine Schälzentrifuge
DE2028267A DE2028267C2 (de) 1970-06-09 1970-06-09 Pneumatische Austragvorrichtung für eine Vertikalsiebzentrifuge

Publications (1)

Publication Number Publication Date
US3763572A true US3763572A (en) 1973-10-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00151231A Expired - Lifetime US3763572A (en) 1970-06-09 1971-06-09 Method and apparatus for pneumatically discharging a drum centrifuge

Country Status (4)

Country Link
US (1) US3763572A (de)
CH (1) CH541998A (de)
DE (2) DE2056893C3 (de)
FR (2) FR2096069A5 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098004A (en) * 1975-10-03 1978-07-04 Joseph Rousselet Apparatus for the dehydration (drying) of textile materials
EP0191965A1 (de) * 1985-02-01 1986-08-27 Matsumoto Machine Mfg. Co., Ltd. Zentrifugalseparator
US4815398A (en) * 1988-03-22 1989-03-28 Keating Environmental Service, Inc. Method and apparatus for detoxifying soils
US5170726A (en) * 1991-11-18 1992-12-15 Thermotech Systems Corporation Apparatus and methods for remediating materials contaminated with hydrocarbons
US5220874A (en) * 1988-03-22 1993-06-22 Keating Environmental Service, Inc. Method and apparatus for stripping volatile organic compounds from solid materials
EP0630838A1 (de) * 1993-06-24 1994-12-28 The BOC Group plc Fördern von teilchenförmigem Material
US20090165326A1 (en) * 2008-01-02 2009-07-02 Hedberg Herbert J Apparatus and method for drying a solid or liquid sample
US9086237B2 (en) * 2012-02-09 2015-07-21 Carrier Corporation Vacuum drying of heat exchanger tubes
CN106040447A (zh) * 2016-08-04 2016-10-26 江苏华大离心机制造有限公司 一种用于离心机内腔的气体保护方法
CN106111357A (zh) * 2016-08-04 2016-11-16 江苏华大离心机制造有限公司 一种离心机的气体保护系统及离心机中保护气体的气路
US20220061615A1 (en) * 2020-08-27 2022-03-03 Mullet Tools, LLC Monolithic dust separator
USD1049527S1 (en) 2021-05-22 2024-10-29 Mullet Tools, LLC Monolithic dust separator

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340636A1 (de) * 1983-11-10 1985-05-23 Krauss-Maffei AG, 8000 München Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen
DE3348120C2 (en) * 1983-11-10 1987-07-16 Krauss-Maffei Ag, 8000 Muenchen, De Pneumatic discharge device for a vertical centrifuge
DE3408789A1 (de) * 1984-03-10 1985-09-12 Arboga System AB, Arboga Zentrifuge zum abscheiden von schneidfluessigkeit von spaenen
DE3426526A1 (de) * 1984-07-18 1986-01-30 Krauss-Maffei AG, 8000 München Pneumatische austragvorrichtung fuer eine schaelzentrifuge
DE3617768A1 (de) * 1986-05-27 1987-12-03 Krauss Maffei Ag Filterzentrifuge
DE3817126A1 (de) * 1988-05-19 1989-11-30 Krauss Maffei Ag Filterzentrifuge zum trennen von suspensionen
EP3219392B1 (de) * 2016-03-17 2019-05-08 Riera Nadeu, S.A. Schälvorrichtung für zentrifuge

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198412A (en) * 1935-01-02 1940-04-23 Engineering Inc Removal and recovery of solvent
US2409713A (en) * 1942-08-19 1946-10-22 Sharples Corp Separation of liquids from solids
US2663089A (en) * 1949-05-03 1953-12-22 Blaw Knox Co Desolventizer vapor recovery system
US2691830A (en) * 1950-06-27 1954-10-19 Blaw Knox Co System for desolventizing solventextracted solid organic particles
US3268078A (en) * 1962-11-14 1966-08-23 Escher Wyss Ag Push-type centrifuge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE853727C (de) * 1951-01-09 1952-10-27 Eisenhuetten Entleerungsvorrichtung fuer Zentrifugen u. dgl.
DE1432886A1 (de) * 1964-03-03 1969-10-23 Titus Hans Joachim Verfahren zum Ausraeumen von Vertikal-Zentrifugen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198412A (en) * 1935-01-02 1940-04-23 Engineering Inc Removal and recovery of solvent
US2409713A (en) * 1942-08-19 1946-10-22 Sharples Corp Separation of liquids from solids
US2663089A (en) * 1949-05-03 1953-12-22 Blaw Knox Co Desolventizer vapor recovery system
US2691830A (en) * 1950-06-27 1954-10-19 Blaw Knox Co System for desolventizing solventextracted solid organic particles
US3268078A (en) * 1962-11-14 1966-08-23 Escher Wyss Ag Push-type centrifuge

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098004A (en) * 1975-10-03 1978-07-04 Joseph Rousselet Apparatus for the dehydration (drying) of textile materials
EP0191965A1 (de) * 1985-02-01 1986-08-27 Matsumoto Machine Mfg. Co., Ltd. Zentrifugalseparator
US4815398A (en) * 1988-03-22 1989-03-28 Keating Environmental Service, Inc. Method and apparatus for detoxifying soils
US5220874A (en) * 1988-03-22 1993-06-22 Keating Environmental Service, Inc. Method and apparatus for stripping volatile organic compounds from solid materials
US5170726A (en) * 1991-11-18 1992-12-15 Thermotech Systems Corporation Apparatus and methods for remediating materials contaminated with hydrocarbons
EP0630838A1 (de) * 1993-06-24 1994-12-28 The BOC Group plc Fördern von teilchenförmigem Material
US20090165326A1 (en) * 2008-01-02 2009-07-02 Hedberg Herbert J Apparatus and method for drying a solid or liquid sample
US8061056B2 (en) * 2008-01-02 2011-11-22 Modular Sfc, Llc Apparatus and method for drying a solid or liquid sample
US9086237B2 (en) * 2012-02-09 2015-07-21 Carrier Corporation Vacuum drying of heat exchanger tubes
CN106040447A (zh) * 2016-08-04 2016-10-26 江苏华大离心机制造有限公司 一种用于离心机内腔的气体保护方法
CN106111357A (zh) * 2016-08-04 2016-11-16 江苏华大离心机制造有限公司 一种离心机的气体保护系统及离心机中保护气体的气路
CN106040447B (zh) * 2016-08-04 2018-06-05 江苏华大离心机制造有限公司 一种用于离心机内腔的气体保护方法
CN106111357B (zh) * 2016-08-04 2018-06-05 江苏华大离心机制造有限公司 一种离心机的气体保护系统及离心机中保护气体的气路
US20220061615A1 (en) * 2020-08-27 2022-03-03 Mullet Tools, LLC Monolithic dust separator
USD1049527S1 (en) 2021-05-22 2024-10-29 Mullet Tools, LLC Monolithic dust separator

Also Published As

Publication number Publication date
DE2028267A1 (de) 1971-12-16
CH541998A (de) 1973-11-15
FR206069A (de)
DE2056893C3 (de) 1979-04-26
DE2056893A1 (de) 1972-05-04
DE2056893B2 (de) 1978-07-13
FR2096069A5 (de) 1972-02-11
DE2028267C2 (de) 1984-11-15

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AS Assignment

Owner name: KRAUSS-MAFFEI AG, KRAUSS-MAFFEI STRASSE 2, D-8000

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TITUS HANS-JOACHIM;REEL/FRAME:004301/0366

Effective date: 19840727