US3821857A - Continuous drying of solid particles - Google Patents

Continuous drying of solid particles Download PDF

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Publication number
US3821857A
US3821857A US00356199A US35619973A US3821857A US 3821857 A US3821857 A US 3821857A US 00356199 A US00356199 A US 00356199A US 35619973 A US35619973 A US 35619973A US 3821857 A US3821857 A US 3821857A
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US
United States
Prior art keywords
basket
chamber
liquid
housing
fluid
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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
US00356199A
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English (en)
Inventor
A Mercier
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.)
Fives Lille Cail
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Fives Lille Cail
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Filing date
Publication date
Application filed by Fives Lille Cail filed Critical Fives Lille Cail
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Publication of US3821857A publication Critical patent/US3821857A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/04—Casings facilitating discharge
    • 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
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor

Definitions

  • Centrifugal driers for such purposes are known, which comprise a rotary drying basket, conduit means for supplying the liquid-solid mixture to be dried to the basket, and a screen in the basket across which passes the liquid phase of the mixture to separate the same from the solid phase.
  • the solid particles of the mixture glide along the wall of the rotary basket under centrifu' gal force or by means of a suitable extraction mechanism and are ejected from the basket at one end thereof.
  • An annular housing surrounds the basket and is arranged to receive the particles ejected from the basket at high speed so that they are thrown against the wall of the housing with considerable force, the basket turning in the housing. Under the impact, these particles are broken up, resulting in undesirable fines.
  • the extent of the impact may be reduced by increasing the size of the annular housing so that the ejected particles are slowed down by the air in the housing in their longer trajectory.
  • the deceleration of the particles is diminished when their size increases so that their slowing down becomes insufficient for larger size particles unless the dimensions of the apparatus are unduly enlarged. This has been the case in connection with the dryingof crystal sugar used in general commerce.
  • the invention is based on the fact that the advance of a solid particle in a fluid, i.e. its drag, is proportional to the density of the fluid in which it moves, all other operating conditions being equal.
  • solid particles are continuously dried by projecting the particles out of a rotary drying basket into a fluid-tight, closed chamber to form a trajectory of the projected particles along the periphery of the chamber, and filling the chamber completely with a dense and inert gaseous fluid, such as compressed air maintained at a substantially uniform pressure, to increase the drag on the projected particles and to brake them along the entire length of their trajectory.
  • a dense and inert gaseous fluid such as compressed air maintained at a substantially uniform pressure
  • the centrifugal drier of this invention comprises a rotary drying basket, conduit means for supplying a liquid solid mixture to be dried to the basket, and a screen in the basket for separating the liquid from the solid, as is conventional.
  • An annular housing surrounds the basket, which is mounted in the housing for rotation, and is arranged to receive the separated liquid therefrom.
  • a fluid-tight, closed casing defining a drying chamber surrounds the housing and is arranged to receive the solid particles centrifugally ejected from the basket at one end thereof.
  • a source of a dense gaseous fluid is connected to the housing and to the casing, means being provided for delivering from this source a volume of the gaseous fluid into the chamber. The dried solid particles are removed from the casing through a gastight outlet.
  • FIG. 1 is a transverse vertical section of a centrifugal drier according to the present invention.
  • FIG. 2 schematically illustrates the operation of the apparatus.
  • the drier is illustrated to comprise rotary drying bowl or basket I mounted for rotation on mount-2 which supports the basket for rotation about the vertical axis of the drier.
  • the means for rotating the basket comprises motor 10 whose output shaft is connected by coupling rod 11 to shaft 6, the shaft being coupled to the vertical driving shaft of basket 1 by transmission 3 which may be a reduction gear or a gearing designed to multiply the speed of the motor.
  • a support frame 8 supports double bearing 7 wherein shaft 6 is journaled, and a gasket 9 provides a fluid-tight mounting for the shaft 6.
  • 'Rotary basket 1 is surrounded by annular housing 22 which supports mount 2 for the basket on support structure 5 inwardly extending from the wall of housing 22, the illustrated support structure consisting of a series of radially extending ribs which support the peripheral edge of the mount 2.
  • Conical tub or tank 15 surrounds annular housing 22 and is connected thereto by radial ribs 14 interconnecting the walls of the housing and the conical tank which forms a funnel.
  • the tank is closed by cover 16 to constitute a fluid-tight, closed casing defining a drying chamber.
  • Flanges l8 and 19 are respectively affixed to the tank and the cover, and gasket 17 is placed between the flanges to provide a fluid-tight seal therebetween.
  • a housing 12 is provided in the walls of housing 22 and casing 15 to hold the shaft structure interconnecting the outside motor 10 with the transmission 3 for driving basket 1.
  • a series of columns 13 support the casing 15 and thus the entire drier.
  • annular housing 22 communicates with the drying chamber defined by casing 15 only through a narrow annular slot 41 defined between a flange at the upper end of basket 1 and the upper edge of housing 22. In this manner, the interior of housing 22 is substantially shut off from the interior of the drying chamber so as to avoid air turbulences in the drying chamber caused by the rotation of basket 1 in housing 22.
  • sleeve 20 is affixed to cover 16 and extends towards the upper flange of basket 1, carrying a flexible skirt 42 at its lower end which reaches within a small distance from the basket flange. In this manner, the pressure is substantially uniform in the entire peripheral part of the fluid-tight casing.
  • the liquid-solid mixture to be dried is supplied to the basket along the axis thereof by input conduit 24 which is connected to the cover by a flexible sleeve 25.
  • a coaxially extending rotary distributor 26 in the basket assures the even distribution of the mixture in the basket.
  • the liquid phase of the mixture is separated or filtered through screen or sieve 4 mounted along the wall of the basket, the liquid being removed through ports in the basket wall leading into annular chambers 27 and 28 formed in housing 22 by suitable partitions.
  • Outlet conduits 29 and 30 lead from annular chambers 27 and 28 through the walls of housing 22 and casing to the outside to evacuate the liquid from the drier.
  • the solid particles separated on screen 4 from the liquid phase glide upwardly along the screen during rotation of basket 1 and are centrifugally ejected at the upper end of the basket into the drying chamber defined by casing 15, passing through the small annular slot defined between the upper flange of basket 1 and' flexible skirt 42.
  • a sleeve 31 of an elastic sheet material is mounted in the path of the trajectory of the ejected particles along the periphery of the drying chamber, the elastic sleeve cushioning the impact of the particles and deflecting them so that they fall by gravity into the bottom of the funnel-shaped casing wherefrom they are removed through an'outlet illustrated, by way of example, as a rotary gas-tight gate 32. If desired, a conventional valve could be mounted at the bottom to permit removal of the dried particles from the apparatus.
  • the elastic sleeve 42 is mounted on a frame supported on cover 16.
  • FIG. 2 schematically illustrates the operation of the drier according to the invention, i.e. the maintenance of a superatmospheric pressure in the drying chamber.
  • a main 59 delivers the pressure-controlled gaseous fluid at superatmospheric pressure'to conduits 21 and 23 leading respectively to casing 15 and housing 22 to maintain a desired pressure in the drying chamber and in the liquidreceiving chamber defined by housing 22.
  • Another branch conduit 60 leads from the main into supply tank 45 which holds the liquid-solid mixture to be dried and is connected to input conduit 24 supplying the mixture to basket 1.
  • Yet another branch conduit 61 leads from the main into drainage tanks 46 and 47 respectively connected to outlet conduits 29 and 30 to receive the drained liquid. In this manner, va pressure equal to that in the drying chamber and in housing 22 is maintained in supply tank 45 and drainage tanks 46, 47.
  • the liquid-solid mixture to be dried is held in storage in a conventional mixer 48 including a screw conveyor. It may be desirable to provide heating means for the mixer.
  • a volumetric pump 49 delivers the well mixed liquid-solid mixture from mixer 48 to supply tank 45, a pump speed control 50 being controlled by a level control 51 to keep the level of the mixture in tank 45 at a desired height by controlling the pump speed.
  • Similar liquid level controls 54, 55 are provided for drainage tanks 46, 47 to control valves 56 and 57 mounted in the outlet conduits of the tanks to permit controlled evacuation of the liquid from these tanks in correspondence to the liquid amounts received therein and so as to maintain the desired pressure in the tanks.
  • the casing 15 can be filled-upwith a heavy gas, such as Krypton, at atmospheric or higher than atmospheric pressure, in place of compressed air.
  • a heavy gas such as Krypton
  • a centrifugal drier for the continuous production of dried solid particles comprising 1. a rotary drying basket,
  • first conduit means for supplying a liquid-solid mixture to be dried to the basket
  • a source of gaseous fluid connected to the casing for'maintaining a controlled pressure in the chamber, the fluid having a higher density than air at atmospheric pressure at the controlled pressure, and
  • the reservoir means comprises a supply tank for the liquid-solid mixture connected to the conduit means for supplying the liquid-solid mixture, and further comprising a variable output pump for delivering the mixture from the supply tank to the basket, and a control regulating the pump output so as to maintained a predetermined level of the mixture in the tank.
  • the reservoir means comprises a drainage tank for the liquid connected to the conduit means for removing the separated liquid, and further comprising an outlet conduit for the drainage tank and a control valve in the outlet conduit for maintaining a predetermined level of the liquid in the drainage tank.
  • centrifugal drier of claim 7 further comprising an annular flange at the outlet end of the basket, the annular flange extending into the annular space and the upperedge of the housing and the lower edge of the skirt terminating close to the flange at opposite sides thereof.

Landscapes

  • Centrifugal Separators (AREA)
  • Drying Of Solid Materials (AREA)
US00356199A 1972-05-04 1973-05-01 Continuous drying of solid particles Expired - Lifetime US3821857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7215816A FR2186298B1 (enrdf_load_stackoverflow) 1972-05-04 1972-05-04

Publications (1)

Publication Number Publication Date
US3821857A true US3821857A (en) 1974-07-02

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ID=9097974

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Application Number Title Priority Date Filing Date
US00356199A Expired - Lifetime US3821857A (en) 1972-05-04 1973-05-01 Continuous drying of solid particles

Country Status (12)

Country Link
US (1) US3821857A (enrdf_load_stackoverflow)
AR (1) AR198410A1 (enrdf_load_stackoverflow)
AU (1) AU462193B2 (enrdf_load_stackoverflow)
BE (1) BE798768A (enrdf_load_stackoverflow)
BR (1) BR7303208D0 (enrdf_load_stackoverflow)
CH (1) CH576813A5 (enrdf_load_stackoverflow)
DE (1) DE2322587A1 (enrdf_load_stackoverflow)
ES (1) ES414347A1 (enrdf_load_stackoverflow)
FR (1) FR2186298B1 (enrdf_load_stackoverflow)
GB (1) GB1416093A (enrdf_load_stackoverflow)
PL (1) PL86186B1 (enrdf_load_stackoverflow)
ZA (1) ZA733042B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130944A (en) * 1976-05-20 1978-12-26 Krauss-Maffei Aktiengesellschaft Centrifugal fluidized-bed drying method and apparatus
US5743840A (en) * 1996-06-24 1998-04-28 Carr Separations, Inc. Centrifuge with a heating jacket for drying collected solids
EP1092478A1 (de) * 1999-10-12 2001-04-18 Hein, Lehmann Trenn- und Fördertechnik GmbH Kontinuierliche arbeitende Zentrifuge
CN113522543A (zh) * 2021-07-19 2021-10-22 浙江大茗堂生物科技有限公司 茶叶内芳香物质离心提取装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL400552A1 (pl) 2012-08-29 2014-03-03 Polimer Polska Spólka Z Ograniczona Odpowiedzialnoscia Hydromieszacz

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1010511A (en) * 1910-11-09 1911-12-05 Charles J Mesta Drying sheets.
US2010902A (en) * 1932-10-17 1935-08-13 Norsk Hydro Elektrisk Process and apparatus for converting liquid substances into the form of granules
US3724091A (en) * 1971-05-11 1973-04-03 J Rousselet Continuous production centrifuge

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US617865A (en) * 1899-01-17 skinner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1010511A (en) * 1910-11-09 1911-12-05 Charles J Mesta Drying sheets.
US2010902A (en) * 1932-10-17 1935-08-13 Norsk Hydro Elektrisk Process and apparatus for converting liquid substances into the form of granules
US3724091A (en) * 1971-05-11 1973-04-03 J Rousselet Continuous production centrifuge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130944A (en) * 1976-05-20 1978-12-26 Krauss-Maffei Aktiengesellschaft Centrifugal fluidized-bed drying method and apparatus
US5743840A (en) * 1996-06-24 1998-04-28 Carr Separations, Inc. Centrifuge with a heating jacket for drying collected solids
EP1092478A1 (de) * 1999-10-12 2001-04-18 Hein, Lehmann Trenn- und Fördertechnik GmbH Kontinuierliche arbeitende Zentrifuge
CN113522543A (zh) * 2021-07-19 2021-10-22 浙江大茗堂生物科技有限公司 茶叶内芳香物质离心提取装置

Also Published As

Publication number Publication date
PL86186B1 (enrdf_load_stackoverflow) 1976-05-31
FR2186298B1 (enrdf_load_stackoverflow) 1974-12-20
BE798768A (fr) 1973-08-16
ES414347A1 (es) 1976-09-16
ZA733042B (en) 1974-04-24
CH576813A5 (enrdf_load_stackoverflow) 1976-06-30
AR198410A1 (es) 1974-06-21
BR7303208D0 (pt) 1974-08-15
GB1416093A (en) 1975-12-03
AU462193B2 (en) 1975-06-19
DE2322587A1 (de) 1973-11-15
AU5520673A (en) 1974-11-07
FR2186298A1 (enrdf_load_stackoverflow) 1974-01-11

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