US3771237A - Device for drying damp powders - Google Patents

Device for drying damp powders Download PDF

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Publication number
US3771237A
US3771237A US00240929A US3771237DA US3771237A US 3771237 A US3771237 A US 3771237A US 00240929 A US00240929 A US 00240929A US 3771237D A US3771237D A US 3771237DA US 3771237 A US3771237 A US 3771237A
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US
United States
Prior art keywords
supporting plate
powder
drying
chamber
outlet
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
US00240929A
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English (en)
Inventor
O Hansen
T Kahler
P Mengel
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GEA Process Engineering AS
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Niro Atomizer AS
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Filing date
Publication date
Application filed by Niro Atomizer AS filed Critical Niro Atomizer AS
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Publication of US3771237A publication Critical patent/US3771237A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Definitions

  • ABSTRACT A device for drying powders with a high moisture content comprising a drying chamber with a powder inlet and a drying gas outlet at the top and a powder outlet and a drying gas intake at the bottom, a perforated supporting plate being mounted in the upper portion of the chamber, a rotating distributor being provided centrally beneath the powder inlet above the perforated plate. lmmediately above the perforated plate a number of heating elements are arranged, whereas one or several overflows leads from the perforated plate down to an additional perforated supporting plate mounted below the first one and provided with a number of vertical guiding walls and a number of overflows communicating with the powder outlet.
  • the present invention relates to a device for drying powders with a high moisture content, particularly powders whose moisture content is so elevated that they cannot be immediately fluidized, which device consists of a drying chamber, the principal portion of which is cylindrical in shape with a vertical axis and in which, at the top, a powder inlet and, at the bottom, a powder outlet are provided, in addition to which, at the bottom, a drying gas intake and, at the top, a drying gas outlet are provided.
  • a multiple step drying operation is usually called for in that during the last step or steps, when sufficient moisture has been removed in advance, a fluidized layer of the powder is produced with the aid of the drying gas.
  • the object of the present invention is to provide a simplified construction of the equipment required for such a drying operation and this is achieved by the device according to the invention which is characterized in that a perforated supporting plate is mounted inthe topmost portion of the chamber, above which, disposed centrally underneath the powder inlet, a rotating distributor is fitted while, immediately above this supporting plate, a plurality of heating elements are arranged, preferably in the form of radial, vertical walls and in that, from the supporting plate, a powder outlet is provided in the form of one or several overflows which leads or lead, as the case may be, down to an additional perforated supporting plate mounted below the first supporting plate which is fitted with one or several vertical guiding walls for the fluidized powder and with one or several overflows that communicate with the powder outlet of the device.
  • a fluidized layer is built up right from the start of the operation, which can be brought about either by first introducing an appropriate quantity of dry powder or by beginning to supply the material sufficiently slowly so that it will be dry before the layer has become too thick so that, in this manner, a fluidized layer can build up which is of a thickness corresponding to the height of the overflow level.
  • the powder then runs, via the overflow, down onto the lower supporting plate where fluidization takes place immediately and it is now possible for the process to continue at the normal operating speed in the sequence described in the foregoing.
  • this gas flow through the top layer nevertheless is of considerable importance to the drying process owing to the movement it imparts to the powder present on the topmost supporting plate.
  • a pure drying operation is aimed at with the device according to the invention, that is to say that the device is intended especially for drying powders of the type that do not possess a marked tendency towards forming agglomerates, e.g. materials such as polyethylene, polypropylene, polyvinyl chloride, acrylnitrilebutadiene-styrene and other polymeric products which, by way of example, may be supplied in the form of filter cakes or pressed cakes.
  • the invention also pertains to a method of operating the device and, according to the invention, this consists in that, when starting up the device, a fluidized layer is built up on the topmost supporting plate by supplying a certain quantity of fluidizable powder or by supplying the wet powder in such a way that this is dried sufficiently so as to become fluidizable before the thickness of the layer exceeds the height of the overflow level.
  • the device is shaped like a chamber comprising an upper cylindrical portion 1 and a lower funnel-shaped portion 2.
  • the material to be dried is supplied at the top by means of a screw feeder 3, whereby it drops onto a centrally mounted distributing disc 4 constructed with ribs 5 on the topside that are designed to hurl the powder from the disc.
  • This disc 4 is secured on a shaft 6 which is driven by a motor 7, for example, a hydraulic motor. From distributing disc 4 the material is flung onto a perforated supporting plate 8 mounted topmost in the cylindrical portion 1 of the chamber, on the topside of which plate a plurality of radial, vertically arranged heating elements 9 are'fitted which are heated by means of steam and are provided with a steam inlet 10 and a steam outlet 11.
  • An overflow pipe 12 is passed centrally through supporting plate 8, whose topmost termination 13 is located at such a height above supporting plate 8 that a suitable layer thickness is determined thereby.
  • This pipe 12 leads down to a lower perforated supporting plate 14 on which a spiral guiding wall 15 is mounted.
  • an overflow pipe 16 is fitted which passes down through the funnel-shaped portion 2 of the chamber to a powder outlet, the height of which above supporting plate 14 determines the thickness of the layer on this plate.
  • the drying gas is supplied from below via the funnelshaped chamber portion 2 by means of a gas intake 18.
  • the gas passes the two supporting plates 14 and 8 and is removed from the chamber via a gas outlet 19 at the top.
  • the material that is to be dried is supplied with an elevated moisture content and it will consequently be somewhat cohesive, however, with the aid of distributing disc 4, a sufficiently high degree of disintegration of the material takes place so as to render a uniform distribution on supporting plate 8 possible on which the previously supplied material has already been dried to a sufficiently high degree so as to form a fluidized layer in which the material hurled off the disc sinks and is rapidly dried sufficiently for fluidization to take place.
  • the drying operation is effected mainly with the aid of the radial heating elements 9 in that the drying gas, subsequent to having passed supporting plate 14 and the layer disposed thereon, has a greatly diminished drying potential.
  • the drying process in the layer on plate 8 takes place, mainly by surface evaporation from the particles in that the liquid that evaporates from the surface is continually replaced by liquid difiusing from the inside of the particles.
  • a heating element is incorporated into the outermost portion of the spiral wall 15 which, just like the radial heating elements 9, is supplied with steam by means of a steam inlet 21 and provided with a steam outlet 22.
  • a cleansing device in the form of a pair of radial pipes 23 is mounted underneath plate 8, which cleansing device is pivotable around overflow pipe 12 by means of a motor 24, the shaft 25 of which is passed through pipe 26 to a gear 27 that is not shown in greater detail.
  • pipe 26 is fitted with a gas intake 28 for cleaning gas which is conducted through pipe 26 to pipes 23, from which the cleaning gas is emitted against the underside of plate 8 through a plurality of nozzles.
  • This cleansing device does not constitute the subject matter of the present invention but is described in greater detail in our copending patent application, corresponding to Danish Application No. 1798/71 and will, for this reason, not
  • the build-up of the fluidized layer at the start of the operation of the device can be effected in addition to dried material being supplied or by slowly supplying wet material also by a suitable quantity of wet material being filled into the device, for instance, approximately up to the level of the overflow and by drying this material until it is fluidized, whereupon the feeding of material is commenced with.
  • the drying gas employed can be air or some other type of gas and the cleaning gas should preferably be of the same kind as the drying gas utilized in the device.
  • An apparatus for drying powders with a high moisture content including a generally cylindrical drying chamber having a vertical axis, a powder inlet and a drying gas outlet at the top, and a final powder outlet and a drying gas intake at the bottom, comprising: a first perforated supporting plate mounted in the topmost portion of the chamber, a rotating distributor disposed centrally underneath the powder inlet and above the supporting plate, a plurality of heating elements arranged immediately above the supporting plate in the form of radial, vertical walls, an intermediate powder outlet from the supporting plate in the form of at least one first overflow, a second perforated supporting plate mounted below the first supporting plate and the intermediate powder outlet, at least one vertical guiding wall for the fluidized powder fitted to the second supporting plate, and at least one second overflow fitted to the second supporting plate that communicates with the final powder outlet.
  • the rotating distributor comprises a rotating disc of small diameter in relation to the diameter of the chamber, the disc having ribs on its topside designed to hurl the powder from the disc.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US00240929A 1971-04-16 1972-04-04 Device for drying damp powders Expired - Lifetime US3771237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK183471AA DK125813B (da) 1971-04-16 1971-04-16 Apparat til tørring af fugtige pulvere.

Publications (1)

Publication Number Publication Date
US3771237A true US3771237A (en) 1973-11-13

Family

ID=8108404

Family Applications (1)

Application Number Title Priority Date Filing Date
US00240929A Expired - Lifetime US3771237A (en) 1971-04-16 1972-04-04 Device for drying damp powders

Country Status (6)

Country Link
US (1) US3771237A (it)
JP (1) JPS5124154B1 (it)
DE (1) DE2217578C2 (it)
DK (1) DK125813B (it)
GB (1) GB1381323A (it)
IT (1) IT954633B (it)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237800A (en) * 1978-02-13 1980-12-09 Stal-Laval Turbin Ab Multi-stage cleaning plant
US5297348A (en) * 1993-03-01 1994-03-29 The French Oil Mill Machinery Company Process and apparatus for efficiently drying wet-milled corn germ and other materials
US5615493A (en) * 1994-03-11 1997-04-01 Niro Holding A/S/ Spray drying device
US6253463B1 (en) * 1999-04-26 2001-07-03 Niro A/S Method of spray drying
US6383810B2 (en) 1997-02-14 2002-05-07 Invitrogen Corporation Dry powder cells and cell culture reagents and methods of production thereof
WO2002036735A2 (en) 2000-11-06 2002-05-10 Invitrogen Corporation Dry powder cells and cell culture reagents and methods of production thereof
US20030108839A1 (en) * 1999-12-23 2003-06-12 Watson Richard William Partial oxidation of hydrogen sulphide
US20030153079A1 (en) * 2001-11-30 2003-08-14 Invitrogen Corporation Dry powder cell culture products containing lipid and methods of production thereof
US6627426B2 (en) 1997-02-14 2003-09-30 Invitrogen Corporation Methods for reducing adventitious agents and toxins and cell culture reagents produced thereby
US20040022666A1 (en) * 1998-06-30 2004-02-05 Invitrogen Corporation Methods for reducing adventitious agents and toxins and cell culture reagents produced thereby
US20060003447A1 (en) * 2003-12-30 2006-01-05 Richard Fike Dry powder cells and cell culture reagents and methods of production thereof
WO2006067126A1 (en) 2004-12-22 2006-06-29 Solvay (Société Anonyme) Method for drying a wet polymer
US7078057B2 (en) 1999-12-20 2006-07-18 Kerkhof Nicholas J Process for producing nanometer particles by fluid bed spray-drying
US20060210640A1 (en) * 1999-12-20 2006-09-21 Kerkhof Nicholas J Process for producing nanoparticles by spray drying
EP2172227A1 (en) 1998-06-30 2010-04-07 Life Technologies Corporation Methods for reducing adventitious agents or toxins in a sample and cell culture reagents produced thereby
WO2012109694A1 (en) * 2011-02-18 2012-08-23 Sai Ying Ko Process for preparing products comprising stabilised actives and compositions comprising same
CN109114906A (zh) * 2018-07-23 2019-01-01 陈东兴 一种新材料加工用结块料干燥装置
CN109883175A (zh) * 2019-02-27 2019-06-14 燕山大学 具有刮板和涡轮的复合生物质干燥机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2430582A1 (fr) * 1978-07-05 1980-02-01 Kishinevsky Politekhn Ins Installation pour le sechage de matieres pulverulentes
DE4232110A1 (de) * 1992-09-25 1994-03-31 Metallgesellschaft Ag Reaktor zum Trocknen wasserhaltiger Feststoffe in einem beheizten Wirbelbett und Verfahren zum Betreiben des Reaktors
EP0819904A1 (de) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Dampf-Wirbelschicht-Trocknungsanlage
EP0819902A1 (de) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Anlage zur Dampf-Wirbelschicht-Trocknung
CN113587559B (zh) * 2021-07-23 2022-04-22 江苏祥瑞药业有限公司 一种基于盐酸二甲双胍缓释片制备用沸腾干燥机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703275A (en) * 1951-01-08 1955-03-01 Martin A Elliott Apparatus for conducting heterogeneous chemical reactions
US3511843A (en) * 1965-11-06 1970-05-12 Imp Tobacco Co Ltd Plural stage fluidization and vibration of cohesive plant material
US3585732A (en) * 1968-05-15 1971-06-22 Gen Am Transport Apparatus for drying solids

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD18116A (it) *
GB666172A (en) * 1949-04-12 1952-02-06 Norman Victor Sydney Knibbs Improvements in or relating to the heat treatment of finely-divided solids
DE883591C (de) * 1951-08-28 1953-07-20 Chemische Werke Huels Ges Mit Verfahren zum Eindampfen von Loesungen
DE967855C (de) * 1952-01-25 1957-12-19 Ruhrgas Ag Verfahren und Vorrichtung zur Durchfuehrung chemischer Reaktionen zwischen gekoerntem oder staubfoermigem Gut und Gasen
GB729186A (en) * 1952-05-07 1955-05-04 Celleco Ab Improvements in or relating to drying of materials in the form of particles
BE579015A (it) * 1958-05-31

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703275A (en) * 1951-01-08 1955-03-01 Martin A Elliott Apparatus for conducting heterogeneous chemical reactions
US3511843A (en) * 1965-11-06 1970-05-12 Imp Tobacco Co Ltd Plural stage fluidization and vibration of cohesive plant material
US3585732A (en) * 1968-05-15 1971-06-22 Gen Am Transport Apparatus for drying solids

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237800A (en) * 1978-02-13 1980-12-09 Stal-Laval Turbin Ab Multi-stage cleaning plant
US5297348A (en) * 1993-03-01 1994-03-29 The French Oil Mill Machinery Company Process and apparatus for efficiently drying wet-milled corn germ and other materials
WO1994020805A1 (en) * 1993-03-01 1994-09-15 The French Oil Mill Machinery Company Drying wet-milled corn germ
US5440823A (en) * 1993-03-01 1995-08-15 The French Oil Mill Machinery Company Process and apparatus for efficiently drying wet-milled corn germ and for processing other materials
US5561916A (en) * 1993-03-01 1996-10-08 The French Oil Mill Machinery Company Process and apparatus for efficiently drying wet-milled corn germ and for processing other materials
US5615493A (en) * 1994-03-11 1997-04-01 Niro Holding A/S/ Spray drying device
EP2281873A1 (en) 1997-02-14 2011-02-09 Life Technologies Corporation Dry powder cells and cell culture reagents and methods of production thereof
US20040087022A1 (en) * 1997-02-14 2004-05-06 Invitrogen Corporation Dry powder cells and cell culture reagents and methods of production thereof
US20080311660A1 (en) * 1997-02-14 2008-12-18 Invitrogen Corporation Dry powder cell culture products and methods of production thereof
US20080019883A1 (en) * 1997-02-14 2008-01-24 Invitrogen Corporation Dry powder cell culture products and methods of production thereof
US20080261308A1 (en) * 1997-02-14 2008-10-23 Invitrogen Corporation Dry powder cell culture products and methods of production thereof
US6627426B2 (en) 1997-02-14 2003-09-30 Invitrogen Corporation Methods for reducing adventitious agents and toxins and cell culture reagents produced thereby
US7572632B2 (en) 1997-02-14 2009-08-11 Life Technologies Corporation Dry powder cells and cell culture reagents and methods of production thereof
US6383810B2 (en) 1997-02-14 2002-05-07 Invitrogen Corporation Dry powder cells and cell culture reagents and methods of production thereof
EP2172227A1 (en) 1998-06-30 2010-04-07 Life Technologies Corporation Methods for reducing adventitious agents or toxins in a sample and cell culture reagents produced thereby
US20040022666A1 (en) * 1998-06-30 2004-02-05 Invitrogen Corporation Methods for reducing adventitious agents and toxins and cell culture reagents produced thereby
US6253463B1 (en) * 1999-04-26 2001-07-03 Niro A/S Method of spray drying
US7078057B2 (en) 1999-12-20 2006-07-18 Kerkhof Nicholas J Process for producing nanometer particles by fluid bed spray-drying
US20060210640A1 (en) * 1999-12-20 2006-09-21 Kerkhof Nicholas J Process for producing nanoparticles by spray drying
US8771740B2 (en) 1999-12-20 2014-07-08 Nicholas J. Kerkhof Process for producing nanoparticles by spray drying
US20030108839A1 (en) * 1999-12-23 2003-06-12 Watson Richard William Partial oxidation of hydrogen sulphide
EP2295533A2 (en) 2000-11-06 2011-03-16 Life Technologies Corporation Dry powder cells and cell culture reagents and methods of production thereof
WO2002036735A2 (en) 2000-11-06 2002-05-10 Invitrogen Corporation Dry powder cells and cell culture reagents and methods of production thereof
EP2251417A1 (en) 2001-11-30 2010-11-17 Life Technologies Corporation Dry powder cell culture medium containing liquid and methods of production thereof
EP2253699A1 (en) 2001-11-30 2010-11-24 Life Technologies Corporation Dry powder cell culture products containing lipid and methods of production thereof
US20030153079A1 (en) * 2001-11-30 2003-08-14 Invitrogen Corporation Dry powder cell culture products containing lipid and methods of production thereof
US20060003447A1 (en) * 2003-12-30 2006-01-05 Richard Fike Dry powder cells and cell culture reagents and methods of production thereof
US20080127507A1 (en) * 2004-12-22 2008-06-05 Solvay (Societe Anonyme) Method For Drying A Wet Polymer
WO2006067126A1 (en) 2004-12-22 2006-06-29 Solvay (Société Anonyme) Method for drying a wet polymer
CN102791151A (zh) * 2011-02-18 2012-11-21 高世英 制备包含稳定活性物的产品和包含相同活性物的组合物的方法
WO2012109694A1 (en) * 2011-02-18 2012-08-23 Sai Ying Ko Process for preparing products comprising stabilised actives and compositions comprising same
US8951566B2 (en) 2011-02-18 2015-02-10 Sai Ying Ko Process for preparing products comprising stabilised actives and compositions comprising same
CN102791151B (zh) * 2011-02-18 2016-01-20 高世英 制备包含稳定活性物的产品和包含相同活性物的组合物的方法
US10369539B2 (en) 2011-02-18 2019-08-06 Biolingus Ip Llc Process for preparing products comprising stabilised actives and compositions comprising same
CN109114906A (zh) * 2018-07-23 2019-01-01 陈东兴 一种新材料加工用结块料干燥装置
CN109883175A (zh) * 2019-02-27 2019-06-14 燕山大学 具有刮板和涡轮的复合生物质干燥机
CN109883175B (zh) * 2019-02-27 2020-05-12 燕山大学 具有刮板和涡轮的复合生物质干燥机

Also Published As

Publication number Publication date
DE2217578C2 (de) 1982-06-09
JPS5124154B1 (it) 1976-07-22
IT954633B (it) 1973-09-15
DE2217578A1 (de) 1972-11-02
DK125813B (da) 1973-05-07
GB1381323A (en) 1975-01-22

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