EP0354292A1 - Apparatus for drying finely divided solids - Google Patents

Apparatus for drying finely divided solids Download PDF

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Publication number
EP0354292A1
EP0354292A1 EP19890100216 EP89100216A EP0354292A1 EP 0354292 A1 EP0354292 A1 EP 0354292A1 EP 19890100216 EP19890100216 EP 19890100216 EP 89100216 A EP89100216 A EP 89100216A EP 0354292 A1 EP0354292 A1 EP 0354292A1
Authority
EP
European Patent Office
Prior art keywords
tube
characterized
device according
outer tube
inner
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.)
Withdrawn
Application number
EP19890100216
Other languages
German (de)
French (fr)
Inventor
Uwe Christiansen
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.)
Heraeus Quarzglas GmbH and Co KG
Original Assignee
Heraeus Quarzglas GmbH and Co KG
Heraeus Quarzschmelze GmbH
Heraeus Schott Quarzschmelze GmbH
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
Priority to DE3826047 priority Critical
Priority to DE19883826047 priority patent/DE3826047C2/de
Application filed by Heraeus Quarzglas GmbH and Co KG, Heraeus Quarzschmelze GmbH, Heraeus Schott Quarzschmelze GmbH filed Critical Heraeus Quarzglas GmbH and Co KG
Publication of EP0354292A1 publication Critical patent/EP0354292A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/16Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials passing down a heated surface, e.g. fluid-heated closed ducts or other heating elements in contact with the moving stack of material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements
    • F26B23/04Heating arrangements using electric heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/28Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infra-red-emitting elements

Abstract

A device for the continuous drying of finely divided solids at temperatures in the range from 800 to 1000 ° C. by evaporating adhering moisture is described. The vertical drying space (1) is formed by the space between an inner (2) and outer tube (3). The outer tube (3) is surrounded by a heating source (18) (electrical resistance heating, infrared radiator) and is formed from several, nested tube sections (3), the upper end (4,5) of which is funnel-shaped, into which the lower smooth end of the pipe sections (3) arranged above protrude. Spacer elements (6) are provided between the tube ends which are inserted one into the other. The pipe sections (3) consist of material that is transparent to infrared radiation.

Description

  • The invention relates to a device for the continuous drying of finely divided solids by evaporating adhering moisture.
  • Devices of the aforementioned type are known from CH-PS 343 887. They have a vertical drying space between an inner and an outer tube. A supply nozzle for moist solids opens into the drying chamber at its upper end and a discharge funnel for dried solids is provided at its lower end. The outer tube is covered by a heating jacket through which a heating medium flows and directly heats the wall of the outer tube. By heating the outer tube wall, heat is continuously supplied to the moist solid during the drying process. The dried solids are collected in a collection container. Pre-warmed clean gas supplied with the wet solids to whirl it up escapes through the inner tube. The dry solid is separated from the gas like a cyclone separator.
  • From DE-PS 1 085 751 a device for drying grain is known, in which the grain to be dried is conveyed over trickling surfaces inclined to the horizontal and connected in series and is thereby exposed to the action of infrared radiators.
  • When drying fine-particle solids, which become thermal insulators as a result of the drying process, there are not insignificant problems with the heat transfer, because such solids can be dried well as long as their moisture content of adhering moisture is still high, but with increasing dryness the thermal insulation properties come into play more and more, so that the drying process finally comes to a standstill.
  • The object of the invention is therefore to provide a device for drying finely divided solids at temperatures above 700 ° C., preferably in the range from 800 to 1000 ° C., which become thermally insulating during drying, such as moist silicon dioxide granules.
  • This problem is solved by a device for the continuous drying of finely divided solids by evaporating adhering moisture, which has a vertical drying space between an inner and an outer tube, at the upper end of which a supply nozzle for moist solids opens and at the lower end of which a discharge funnel for dried solids is provided, and which has a heat source enveloping the outer tube, which is characterized according to the invention in that the outer tube is formed from a plurality of nested tube sections made of infrared radiation-transparent material, the upper end of each tube section in the form of a funnel with a collar attached and the lower end are smooth and at each lower end of a pipe section which projects into an upper end of a pipe section, a spacer is attached and that the heat source in the form of an electrical resistance heater or infrared st rahlern is arranged at a distance from the outer tube. In these devices, it is advantageous that the inner tube is closed on one side, is made of infrared radiation-permeable material and contains an additional heating source in the form of an electrical resistance heater or an infrared radiator, which results in more intensive drying with shorter drying times.
  • The outer tube is expediently encased at a distance from a protective tube made of material which is transparent to infrared radiation. This ensures that released vapors do not have a damaging effect on the heating source. In particular, when it comes to acid vapors, the space between the outer tube and the protective tube is connected to a vapor discharge nozzle, through which such acid vapors can be extracted. In the device according to the invention, the vapors formed during the drying of the moist solids are discharged through the space created when the outer tube ends are plugged into one another. The spacer between the two pipe ends is advantageously designed as an annular body which is provided with through-openings for the vapors. Spacer elements which consist of a plurality of spacer lugs arranged in a ring shape and spaced apart from one another have also proven successful.
  • In order to ensure the best possible drying, it has proven useful that the inner tube, the outer tube and the protective tube are made of quartz glass, at least in the area of the heated zones, which is particularly well permeable to infrared radiation. This has the additional advantage that acid vapors remain without damaging the components of the device. All remaining components are expediently made of quartz material for reasons of purity.
  • In devices according to the invention, the clear width of the drying room is 5 to 10 cm, preferably 5.5 to 6.5 cm, which ensures the drying of moist solids, which become excellent thermal insulators during drying, in industrially acceptable times and in appropriate quantities .
  • In order to achieve continuous drying, the dried solids must be removed in a metered manner, for which purpose conveyor devices in the form of a roller, a screw or a vibrating table are connected to the discharge funnel for dried solids.
  • In the figure, an embodiment of the device according to the invention is shown partly schematically partly in vertical section.
  • The vertical drying chamber 1 is formed by the inner tube 2, which is closed on one side, and the outer tube, which consists of a plurality of tube sections 3 inserted into one another. Each such tube section 3 is formed at one end in the form of a funnel 4 with a collar 5 attached. The smoothly formed end of the pipe section 3 arranged above projects into an end of a pipe section 3 designed in this way. At the smooth end of each pipe section 3, a plurality of spacers 6 are attached. In the exemplary embodiment, they are designed as spacer studs. Several such studs are arranged in a ring shape on the circumference of the lower end of the pipe section spaced apart. An inlet funnel 7 projects into the upper end of the uppermost tube section 3, on which a bell 9 is placed over sealing elements 8 and is provided with the supply nozzle 10 for the moist granulate 11 a, which is located in a feed container 12. An additional heating source 13 projects into the inner tube 2, for example a resistance heater, which can be connected to an electrical power source.
  • The outer tube formed from several tube sections 3 is surrounded by a protective tube 14 at a distance. The protective tube 14 is supported at the lower end on a retaining ring 15 which is supported on the support element 17 via a steel plate 16. The support element 17 rests on the one hand on the floor, and on the other hand it serves to support a furnace which completely envelops the drying room 1 and which has a resistance heater 18 which is shielded from the outside by means of the insulating body 19. At the upper end, the protective tube 14 is sealed with sealing elements 8 and an intermediate ring 20 with the filling funnel 7 and the bell 9. At the intermediate ring 20 there is the vapor discharge nozzle 21. At the lower end, a discharge funnel 22 connects to the retaining ring 15 via sealing elements 8. The conveying device 23 for the dried granulate 11b is connected to the discharge hopper 22. In the exemplary embodiment, the conveying device 23 consists of a worm 25 driven by a motor 24.
  • The operation of the device according to the invention is as follows:
  • Moist granules 11a reach the drying chamber 1 from the feed container 12 via the supply nozzle 10, the clear width of which is approximately 5.5 to 6.5 cm. In the drying room 1, it is heated by both the resistance heater 18 and the additional heating source 13. The vapors generated can escape, as indicated by the arrows 26, into the space between the outer tube and the protective tube through the funnel-shaped ends of the rotor sections 3 and are discharged via the nozzle 21. The moist granules 11a slide down during the drying process, the throughput speed of the granules to be dried being determined by the discharge of the conveying device which doses the dried granules 11b.
  • The components of the device according to the invention, which are located in the area of the heated zones, advantageously consist of a material which is transparent to infrared radiation, preferably of quartz glass. For the other parts of the device, such as inlet funnel 7, bell 9, feed nozzle 10, retaining ring 15, intermediate ring 20, vapor discharge nozzle 21 and discharge funnel 22, quartz material is used, for example. The use of these materials for the components of the device according to the invention have the advantage that even moist granules 11a which contain acid can be dried without fear of damage to the individual components of the device.

Claims (10)

1.Device for the continuous drying of finely divided solids by evaporation of adhering moisture, which has a vertical drying space between an inner and an outer tube, at the upper end of which a supply nozzle for moist solids opens and at the lower end of which a discharge funnel for dried solids is provided, and which has a heat source enveloping the outer tube, characterized in that the outer tube is formed from a plurality of nested tube sections (3) made of infrared radiation-permeable material, the upper end of each tube section (3) being in the form of a funnel (4) with a collar (5 ) and the lower end are smooth and at each lower end of a tube section which projects into an upper end of a tube section, a spacer element (6) is fixed and that the heat source in the form of an electrical resistance heater (18) or infrared radiators at a distance of the outside ear is arranged.
2. Device according to claim 1, characterized in that the inner tube (2) is closed on one side, consists of infrared radiation-permeable material and contains an additional heating source (13) in the form of an electrical resistance heater or an infrared radiator.
3. Device according to claims 1 and / or 2, characterized in that the outer tube is encased at a distance from a protective tube (14) made of infrared radiation-permeable material.
4. The device according to claim 3, characterized in that with the space between the outer tube and the protective tube (14) is a vapor discharge nozzle (21) in connection.
5. The device according to one or more of the preceding claims, characterized in that the spacer element (6) consists of an annular body with passage openings for vapors.
6. The device according to one or more of claims 1 to 4, characterized in that the spacer element (6) consists of a plurality of spacer lugs arranged in a ring shape and spaced apart.
7. The device according to one or more of the preceding claims, characterized in that the inner tube (2), the outer tube and the protective tube (14) consist of quartz glass at least in the region of the heated zones.
8. The device according to one or more of the preceding claims, characterized in that the distance between the outer surface of the inner tube and the inner surface of the outer tube is 5 to 10 cm.
9. The device according to claim 8, characterized in that the distance between the inner tube and outer tube is 5.5 to 6.5 cm.
10. The device according to one or more of the preceding claims, characterized in that the discharge funnel (22) for the continuous metered removal of the dried solids with a conveyor (23) in the form of a roller, a screw (25) or a vibrating table is connected.
EP19890100216 1988-07-30 1989-01-07 Apparatus for drying finely divided solids Withdrawn EP0354292A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3826047 1988-07-30
DE19883826047 DE3826047C2 (en) 1988-07-30 1988-07-30

Publications (1)

Publication Number Publication Date
EP0354292A1 true EP0354292A1 (en) 1990-02-14

Family

ID=6359980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890100216 Withdrawn EP0354292A1 (en) 1988-07-30 1989-01-07 Apparatus for drying finely divided solids

Country Status (4)

Country Link
US (1) US4964227A (en)
EP (1) EP0354292A1 (en)
JP (1) JPH0723832B2 (en)
DE (1) DE3826047C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1566604A1 (en) * 2002-10-21 2005-08-24 Kabushikikaisha Matsui Seisakusho Drying device for powder material
WO2010089721A1 (en) * 2009-02-09 2010-08-12 Christian Schiavolin Dehumidifier for plastics materials

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL183596B1 (en) * 1996-04-02 2002-06-28 Urban Stricker Apparatus for heat-treating particulate materials during their residence in screw conveyors
DE29504321U1 (en) * 1995-03-17 1995-05-04 Ve Recycling Gmbh Drum dryer
DE102005022154A1 (en) * 2005-05-13 2006-11-16 Degussa Ag Reactor and method for gentle product drying
CN100443841C (en) * 2007-02-06 2008-12-17 宋志强 Gravity drying machine
RU2718107C1 (en) * 2019-10-23 2020-03-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный аграрный университет имени В.Я. Горина" Drier of sprouted grains

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE22653C (en) * 1882-06-11 1883-07-24
US685336A (en) * 1900-07-31 1901-10-29 Prosper Leroy Apparatus for drying grain.
US884230A (en) * 1907-10-31 1908-04-07 Frank A Spivak Grain-heater.
DE365877C (en) * 1922-12-22 Meguin Akt Ges Rieseltrockner
GB688570A (en) * 1950-11-03 1953-03-11 Glover & Co Ltd W T Improved means for heating granular material for the purpose of drying it or otherwise
GB765911A (en) * 1953-01-16 1957-01-16 Bela Thomas Sandor Improvements in or relating to the drying of grain and similar materials
GB954572A (en) * 1961-12-11 1964-04-08 Head Wrightson & Co Ltd Method of drying wet strip material
FR1453810A (en) * 1964-08-13 1966-07-22 Inst Badan Jadrowych Method and apparatus for indirect heating of granular materials
EP0124294A2 (en) * 1983-04-05 1984-11-07 Cactus Machinery Inc. Apparatus for conditioning hygroscopie plastic material
WO1988002090A1 (en) * 1986-09-16 1988-03-24 Chelyabinsky Konstruktorsko-Tekhnologichesky Insti Installation for conductive drying of bulk materials

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US547597A (en) * 1895-10-08 Allen
US9711A (en) * 1853-05-10 Registering apparatus for printing-presses
US2677195A (en) * 1950-06-26 1954-05-04 Rudolf Lorenz Apparatus for treating granular materials
CH343887A (en) * 1955-03-19 1959-12-31 Ruhrchemie Ag Method and apparatus for heat treatment, in particular for drying finely divided solids
DE1076571B (en) * 1955-05-16 1960-02-25 Ruhrchemie Ag Apparatus for successively drying and cooling of cereals
US4201695A (en) * 1975-09-04 1980-05-06 Bergwerksverband Gmbh Arrangement for regenerating particulate adsorbents
US4289481A (en) * 1979-07-06 1981-09-15 Comet, Inc. Fuel and apparatus for drying grain
US4594795A (en) * 1984-10-23 1986-06-17 Erik Stephansen Air bearing support apparatus for drying a moving web

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE365877C (en) * 1922-12-22 Meguin Akt Ges Rieseltrockner
DE22653C (en) * 1882-06-11 1883-07-24
US685336A (en) * 1900-07-31 1901-10-29 Prosper Leroy Apparatus for drying grain.
US884230A (en) * 1907-10-31 1908-04-07 Frank A Spivak Grain-heater.
GB688570A (en) * 1950-11-03 1953-03-11 Glover & Co Ltd W T Improved means for heating granular material for the purpose of drying it or otherwise
GB765911A (en) * 1953-01-16 1957-01-16 Bela Thomas Sandor Improvements in or relating to the drying of grain and similar materials
GB954572A (en) * 1961-12-11 1964-04-08 Head Wrightson & Co Ltd Method of drying wet strip material
FR1453810A (en) * 1964-08-13 1966-07-22 Inst Badan Jadrowych Method and apparatus for indirect heating of granular materials
EP0124294A2 (en) * 1983-04-05 1984-11-07 Cactus Machinery Inc. Apparatus for conditioning hygroscopie plastic material
WO1988002090A1 (en) * 1986-09-16 1988-03-24 Chelyabinsky Konstruktorsko-Tekhnologichesky Insti Installation for conductive drying of bulk materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1566604A1 (en) * 2002-10-21 2005-08-24 Kabushikikaisha Matsui Seisakusho Drying device for powder material
EP1566604A4 (en) * 2002-10-21 2012-11-14 Kabushikikaisha Matsui Seisakusho Drying device for powder material
WO2010089721A1 (en) * 2009-02-09 2010-08-12 Christian Schiavolin Dehumidifier for plastics materials

Also Published As

Publication number Publication date
JPH0278888A (en) 1990-03-19
DE3826047C2 (en) 1990-07-12
US4964227A (en) 1990-10-23
JPH0723832B2 (en) 1995-03-15
DE3826047A1 (en) 1990-02-01

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