US3808701A - Apparatus for drying fluent materials - Google Patents

Apparatus for drying fluent materials Download PDF

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Publication number
US3808701A
US3808701A US00267225A US26722572A US3808701A US 3808701 A US3808701 A US 3808701A US 00267225 A US00267225 A US 00267225A US 26722572 A US26722572 A US 26722572A US 3808701 A US3808701 A US 3808701A
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Prior art keywords
conduit
rotor
scraper
heat exchange
exchange surface
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Expired - Lifetime
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US00267225A
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English (en)
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R Bachmann
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Luwa Ltd
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Luwa Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the rotor supports vane-like elements operatively associated with the inner wall of the conduit.
  • the rotor carries a number of such elements which are successively arranged in the direction of rotation thereof and serve for wiping, circulating, comminuting and scraping of the fluent material.
  • One of the elements is con structed at least as a wiper element and a further element is constructed at least as a scraper element, the free edge of which travels closer to the inner wall of the conduit that the free edge of the wiper element.
  • the scraper element has throughpassage openings for scraped-off material.
  • the present invention relates to a new and improved apparatus for drying fluent materials.
  • a dryer construction is already known to the art which embodies an approximately horizontally arranged heatable treatment compartment or chamber.
  • a rotor is coaxially arranged within this treatment compartment.
  • Star-shaped arms are secured to the rotor, at the ends of which there are provided blades or bucket elements.
  • the blade elements extend up to the direct neighborhood of the wall of the treatment compartment.
  • the arms supporting the blade elements are arranged at the rotor along a helical line, it being important that one blade'partially overlaps the preceding blade viewed in the peripheral direction of the rotor.
  • the material is engaged by the blade elements and conveyed in the form of a spiral-shaped band as a thin layer towards an outlet connection or stud.
  • the material is subjected to thermal treatment, the liquid part of the material being vaporized, that is to say, the material is dried.
  • a drawback of this dryer resides in the fact that owing to the selected blade arrangement the material to be treated is conveyed in a band-like configuration over the treatment wall, and therefore, there is not possible optimum utilization of the available treatment surface.
  • Still a further significant object of the present invention relates to an improved drying apparatus or dryer for fluent materials which is relatively simple in construction, extremely reliable in operation, not readily subject to malfunction, requires a minimum of servicing and maintenance and is economical to manufacture.
  • Yet a further object of the present invention relates to an improved drying apparatus for fluent materials which is designed to make maximum use of the available treatment surface of the treatment compartment, affords a uniform treatment of the material in an efficient and reliable manner, and does not require complicated and expensive controls to achieve the desired treatment effect.
  • the inventive apparatus for drying fluent materials embodies an approximately horizontally arranged substantially cylindrical thermal treatment compartment as well as a rotor rotating internally of the thermal treatment compartment.
  • the rotor carries vane-like elements operatively associated with or proximate to the inner wall of the treatment compartment.
  • the rotor carries a number of such elements which are arranged in succession in the direction of rotation of the rotor and serve for wiping, circulating, comminuting and scraping of the material undergoing treatment.
  • One of the elements is at least constructed as a wiper element and another one of the elements is at least constructed as a scraper element.
  • the free edge of the scraper element is situated more closely to the inner wall of the treatment compartment than the free edge of the wiper element.
  • the scraper element is provided with throughflow openings for the scraped material.
  • the individual material particles are prepared by the treatment elements in such a manner and circulated in the treatment compartment such that the quantity of material per unit of time does not exert any influence upon the frequency of contact of the individual material particles with the treatment compartment wall throughout a wide range of the infed quantity of material.
  • FIG. 1 is a schematic view of a thin-film dryer designed according to the teachings of the present invention
  • FIG. 2 is a cross-sectional view of the dryer depicted in FIG. 1, taken substantially along the line II-II thereof, and showing a first embodiment of rotor construction employed therein;
  • FIG. 3 is a cross-sectional view similar to the showing of FIG. 2, illustrating a second embodiment of construction of rotor
  • FIG. 4 is a schematic view of a further embodiment of thin-film dryer similar to the'showing of FIG. 1;
  • FIG. 5 is a cross-sectional view of the dryer depicted in FIG. 4, taken substantially along the line VV thereof;
  • FIGS. 6 to 9 inclusive schematically illustrate, on an enlarged scale, different constructional embodiments of treatment elements arranged at the rotor depicted in FIG. 5.
  • FIG. 1 the exemplary embodiment of apparatus for drying fluent materials as depicted in FIG. 1 has been generally indicated by reference character 10.
  • This drying apparatus 10 a socalled thin-film dryer, possesses an approximately horizontally arranged conduit or pipe 12 connected at one end to a supply compartment or space 14 and at the other end to a discharge compartment or space 16.
  • a vapor compartment or space 18 At the free end of the supply compartment 14 there is additionally arranged a vapor compartment or space 18, the free end of which is closed by a cover 19 or equivalent structure.
  • The. free end of the discharge compartment 16 is closed by a cover 17.
  • the conduit portion forming the supply compartment 14 is equipped with a radially extending connection or stud 20.
  • the discharge compartment 16 possesses a connection or stud 22 at its associated conduit surface or jacket. Consequently, the conduit 12, i.e., the inner wall of the jacket 26, constitutes a heat exchange surface upon which fluent material is processed.
  • the jacket of the vapor compartment 18 has associated therewith a connectionor stud 24.
  • the conduit 12, the supply compartment 14 as well as the discharge compartment 16 are surroundedby a heating or cooling jacket 26, sometimes conveniently referred to as a heat transfer jacket, which is provided with an inlet connection 28 and an outlet connection 30.
  • a heat transfer jacket either a heating or cooling jacket 32 surrounds the vapor compartment 18, wherein the jacket 32 possesses an inlet connection 36 and an outlet connection 34.
  • a rotor designated by reference character 40 is suitably rotatably arranged in the thin-film dryer 10.
  • This rotor 40 possesses a rotor core 42 which extends over the entire length of the discharge compartment 16, the conduit 12, the supply compartment 14 and the vapor compartment 18, and such rotor 40 and its rotor core 42 are arranged coaxially within conduit 12.
  • a multiple-purpose element 44 for wiping, circulating and comminuting the material to be treated is arranged at a partial section 42 of the rotor core and which is retained at a spacing from the partial core section 42 by a multiplicity of webs 46.
  • the element 44 extends up to the direct region of or proximate to the wall of the conduit 12. It has been found to be especially advantageous if the width of the multiple-purpose element 44 which is in the form of a multiple-purpose blade corresponds approximately to 0.01 to 0.05-times the diameter d of the conduit 12 (cf. reference character g of FIG. 2). Viewed in the di rection of rotation of the rotor 40 the multiple-purpose element 44 is rearwardly flexed, as best seen by referring to such FIG. 2. As also best recognized by referring to FIGS. 2 and 8 the angle which the radial web 46 encloses with the element 44 is in the order of between 40 and preferably 60.
  • the gap such as the gap h of FIG. 2, provided between the inner wall of the conduit l2 and the confronting lengthwise edge of the multiple-purpose element 44 corresponds approximately to 2 to 3-fold the grain or granulation size of the material to be treated.
  • a scraper element 48 Arranged diametrically opposite the multiplepurpose element 44 upon the core portion 42 of the rotor is a scraper element 48 which is connected via a blade or leaf spring 50 with the core portion 42.
  • the blade spring 50 is arranged such that, viewed in the direction of rotation of the rotor 40, it extends rearwardly from the connection location of the blade spring 50 with the core portion 42. The advantages of this measure shall be explained more fully hereinafter.
  • the scraper element 48 is connected by rivets 51 with the blade spring 50.
  • a gap f (FIG. 9) having a play corresponding approximately to that of a running shaft i.e. running clearance is provided between the inner wall of the conduit 12 and the confronting edge of the scraper element 48.
  • the corresponding core portion of the rotor 40 has been designated by reference character 52.
  • a helically-shaped and wound band 54 is secured to the rotor core portion 52, the outermost edge of which extends up to the region of the wall of the supply compartment 14, as shown.
  • the rotor core portion penetrating into the vapor compartment has been designated by reference character 60. Also at this region there is arranged at such rotor core portion 60 a helically-shaped and wound band 62 which is provided over its entire length with throughpassage holes or apertures 64. The significance of such throughpassage holes 64 will be explained more fully hereinafter.
  • the rotor 40 is rotatably mounted at both of its ends in bearings 68 and 70 arranged at the covers 17 and 19 respectively and is operatively connected with any suitable drive 72.
  • the rotor 40 is placed into rotation by drive 72.
  • a heat carrier for instance in the form of water vapor, is delivered to the jackets 26 and 32, in this case constituting heating jackets via the connections 28 and 36 for heating the conduit 12.
  • the temperature of the heat carrier is regulated in accordance with the desired final moisture content of the material to be treated. In this regard care need only be taken to ensure that the heat carrier is delivered at a constant temperature to the heating jackets 26 and 32.
  • the fluent material to be processed and under which there is to be understood a liquid material (for instance a salt solution), or a pasty-like material (for instance a clay-like or muddy-like material), or a pulverulent material (for instance a granulate or centrifuged product) is infed via the connection into the supply compartment 14.
  • the wound band 54 engages the material and displaces such in the direction of and towards the discharge connection 22. As soon as the material has arrived at the operable zone of the multi-purpose or multiple-purpose element 44 it is engaged thereby and distributed in the form of a thin-film.
  • the treated material forms at the front side of the element 44 a nose or bowed wave which increases in volume for such time until it can flow away over the inner edge of the multiple-purpose element 44.
  • the material uniformly distributes at the front side of the multiple-purpose element 44 and thereafter, following the flowing thereof over the inner edge thereof, uniformly falls onto the inner wall of the conduit 12.
  • the material remains resident at this location for such length of time until it is scraped away from the inner wall by the scraper element 48. Due to the rotational velocity of the scraper element 48 and the narrow gap between the scraper element 48 and the inner wall of the treatment compartment the adhering material is completely propelled away therefrom without the scraper element 48 coming into direct contact with the inner wall.
  • the material which has been left by the scraper element 48 at the wall of the conduit 12 will be newly engaged by themultiple-purpose element 44 during the next half rotation of the rotor 40.
  • Any possible agglomerations or conglomorates of dried material are engaged by the inclined arranged element 44 and pressed towards the gap h (FIG. 2). Owing to this action the occurring material-agglomerations are initially compacted, but nonetheless immediately thereafter comminuted. Consequently, the material to be treated is always maintained in a pulverulent or pasty condition.
  • both the scraper element 48 as well as also the blade spring 50 as such has been best shown by referring to FIG. 1.
  • the dammed-up material can flow away laterally and once again be engaged by the next successive element 44.
  • connection 20 to the connection 22 The advancing movement of the material from the connection 20 to the connection 22 is achieved by the conveying action of the wound band or strip 54, so that the material at the region of the conduit 12 is conveyed towards the discharge connection 22 by the continuously further advanced or displaced material.
  • the vapor formed during treatment of the material in the conduit 12 flows, in countercurrent flow with regard to the flow of the treated material, towards the supply compartment 14, flows therethrough and arrives at the region of the vapor compartment 18.
  • the vapors which flow into the vapor compartment 18 impact against the wound band or strip 62 where they are freed of any possibly entrained droplets owing to the prevailing deflection action.
  • the bores or apertures 64 facilitate passage of the droplet-free vapor stream to the region of the vapor connection or outlet 24, through the agency of which the vapors are delivered for instance to a non-illustrated condenser.
  • FIG. 3 A further constructional form of dryer apparatus of the type described in FIGS. 1 and 2 has been shown in FIG. 3.
  • two multiple-purpose or multi-pu'rpose elements 44 these two elements 44 being arranged in diametrically opposed relationship at the rotor core portion 42.
  • these elements 44 are held by webs 46 at a spacing from the rotor core portion 42.
  • a pair of scraper elements are provided in a position displaced with regard to the multiple-purpose elements 44.
  • These scraper elements 48 are also arranged in diametrically opposed relationship with regard to one another at the rotor core portion 42.
  • Scraper elements 48 are secured by rivets 51 or equivalent fastening devices to blade springs 50 which are connected with the rotor core portion 42. Owing to this combination there is achieved an improvement in the treatment of the material in relation to the arrangement depicted in FIG. 2.
  • FIG. 4 there is illustrated a further embodiment of inventive apparatus.
  • the conduit 12 which is surrounded by a heat transfer jacket i.e. a heating or cooling jacket 26, there is coaxially arranged rotor 40.
  • rotor 40 At the core portion 42 of the rotor 40 there are arranged four different elements 80, 82, 88 and 48, wherein each such elements are arranged offset by 90 with regard to one another.
  • the elements 48, 80, 82 and 88 depicted in FIGS. 4 and 5 have been individually shown in a larger view in FIGS. 6 to 9.
  • the wiper element 80 extends axially over the entire length of the associated partial section or core portion 42 of the rotor core and radially up to the region of the wall of the conduit or pipe 12.
  • a gap a is provided between the wall of the conduit 12 and the confronting edge of the wiper element 80, this gap corresponding in size to the desired film or layer thickness of the material to be treated.
  • the circulating element 82 which follows the wiper element 80 looking in the counterclockwise direction, is designed in the form of a band or strip 82 and likewise extends axially over the entire length of the partial section 42 of the rotor core, and wherein the radial extent C of the band 82 corresponds approximately to 0.001 to 0.03 -fold of the diameter (1 (FIG. 7).
  • the gap b between the wall of the conduit 12 and the edge of the band 82 confronting the aforementioned conduit wall corresponds approximately to the play of a running shaft, i.e. running clearance.
  • the band 82 is retained by webs 84 at a spacing from the rotor core 42.
  • the comminution element 88 which follows the material circulation element 82 extends with its flexed portion 86 up to and towards the inner wall of the conduit 12.
  • the scraper element 48 is secured to a blade spring 50 or the like which, in turn, is connected with the rotor core portion 42.
  • the scraper element 48 and the blade spring 50 are connected with one another by rivets 51 or other suitable attachment or fastening devices.
  • the material fed into the thin-film dryer is engaged by the wiper element 80, and wherein all of the material must flow through the gap a which is bounded, on the one hand, by the edge of the wiper element 80 confronting the inner wall of the conduit 12 and, on the other hand, by the inner wall of such conduit itself.
  • the material 92 which is spread or wiped uniformly upon the inner wall of the conduit 12 is subsequently engaged by the band or strip 82 and intensively admixed or agitated, the agitated material flowing over the inner edge of the band 82 and again falling onto the inner wall and there remaining in the form of markedly agglomerated portions 96.
  • the comminuting element 88 following the band 82 now engages the agglomerated or conglomerated material 96 by means of its flexed end portion 86, and wherein there occurs between the end portion 86 and the inner wall of the conduit 12 a compaction of the materials with simultaneous comminution of the agglomerations or conglomerates. At the same time the material is again uniformly distributed upon the inner wall in the form of a thin layer 100.
  • any collection of material between the thus present openings 53 can again deposit upon the inner wall of the conduit 12 and be engaged by the next successive scraper element 48.
  • the end portion 86 encloses with the radial remaining portion of such comminution element 88 and angle a between 40 and most preferably an angle of 60.
  • FIG. 8 By also referring to this Figure it should be recognized that the gap e between the inner wall of the conduit 12 and the free edge of the end portion 86 confronting such inner wall advantageously amounts to 2 to l0-fold the granulation or grain size of the material undergoing treatment.
  • the function of the scraper element 48 depicted in FIG. 8 corresponds to that of the scraper blade 48 described in conjunction with the embodiment of FIG. 2.
  • the scraper element 48 it is of particular significance that it is approximately radially arranged in the conduit 12, and wherein it forms with a tangent at the conduit a right angle [3, as best seen by referring to FIG. 9.
  • the gap f between the wall of the conduit 12 and the therewith confronting lengthwise edge of the scraper element 48 approximately corresponds to the running play or clearance of an appropriate shaft of the same diameter.
  • An apparatus for drying fluent material comprising an approximately horizontally arranged substantially cylindrical conduit defining therein an internal compartment and having a material inlet and material outlet, said conduit including a heat exchange surface confronting said compartment, means arranged within said conduit for conveying infed material therethrough, a rotatable motor arranged within said internal compartment, a plurality of elements which follow one another in the circumferential direction of rotation of said rotor and angularly offset from one another and carried by said rotor, said plurality of elements serving for the wiping, circulation, comminution and scraping of the material, one of said elements being constructed at least as a wiper element and another of said elements being constructed at least as a scraper element, said wiper element and said scraper element each having a respective free edge, the free edge of the scraper element being positioned closer to said heat exchange surface of said conduit than the free edge of the wiper element, said scraper element being provided with throughflow openings for scraped material.
  • said scraper element defines a multi-purpose element which extends substantially over the entire length of said conduit and contains means for comminuting and circulating the material, said scraper element containing means for scraping the treated material from said heat exchange surface of said conduit.
  • the element provided for wiping comprises an axially extending wiper element which extends approximately over the entire length of the conduit.
  • said element provided for circulating the material comprises a band extending approximately over the entire length of the conduit, said band, starting from the region of said heat exchange surface of the conduit, extending in radial direction only over a portion of the free space of the conduit.
  • the element serving to comminute agglomerations of material comprises a vane-like element with axial interruptions and extending over substantially the entire length of the conduit, the end portion of said comminuting element confronting said heat exchange surface of the conduit, viewed in the direction of rotation of the rotor, being flexed towards the rear.
  • the element for scraping the material from said heat exchange surface of the conduit comprises a scraper element which, viewed in the direction of rotation of the rotor, is secured to a resilient element which extends rearwardly from the connection location with the rotor core, said scraper element being arranged approximately radially within the conduit and having a running clearance between said heat exchange surface of the conduit and the confronting lengthwise edge of the scraper element.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US00267225A 1971-07-01 1972-06-28 Apparatus for drying fluent materials Expired - Lifetime US3808701A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH966471A CH535413A (de) 1971-07-01 1971-07-01 Vorrichtung zum Trocknen eines fliessfähigen Stoffes

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US3808701A true US3808701A (en) 1974-05-07

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US00267225A Expired - Lifetime US3808701A (en) 1971-07-01 1972-06-28 Apparatus for drying fluent materials

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US (1) US3808701A (de)
JP (1) JPS5529352B1 (de)
AT (1) AT335362B (de)
AU (1) AU475024B2 (de)
BE (1) BE785439A (de)
CH (1) CH535413A (de)
DD (1) DD97743A5 (de)
DE (1) DE2228682B2 (de)
FR (1) FR2144282A5 (de)
GB (1) GB1401195A (de)
IT (1) IT959902B (de)
NL (1) NL174582C (de)
PL (1) PL84860B1 (de)
SE (1) SE392962B (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452076A1 (fr) * 1979-03-21 1980-10-17 Richter Gedeon Vegyeszet Equipement pour le sechage et la granulation de matieres humides, pateuses et/ou fusibles
US4274342A (en) * 1979-07-16 1981-06-23 Nider William K Apparatus for carbonizing an agricultural product
US4274344A (en) * 1979-07-16 1981-06-23 Nider William K Process for carbonizing an agricultural product
US4420892A (en) * 1979-03-23 1983-12-20 Bayer Aktiengesellschaft Thin film contact dryer
US4668183A (en) * 1984-11-29 1987-05-26 Gieberei Kohlscheid GmbH Lifting element for pipe coolers for material produced at least partially in lumps
US4750274A (en) * 1987-01-27 1988-06-14 Joy Manufacturing Co. Sludge processing
US4980030A (en) * 1987-04-02 1990-12-25 Haden Schweitzer Method for treating waste paint sludge
WO1995018946A1 (en) * 1992-11-17 1995-07-13 Thermtech A/S A process and a device in drying of organic and/or unorganic materials
US5660124A (en) * 1995-09-20 1997-08-26 Alar Engineering Corporation Sludge processor
AU682860B2 (en) * 1994-01-07 1997-10-23 Thermtech A/S A process and a device in drying of organic and/or unorganic materials
WO1998015791A1 (en) * 1996-10-08 1998-04-16 Atlas-Stord Denmark A/S Circular drying element and drying plant with such a drying element
US6061924A (en) * 1997-03-28 2000-05-16 Rubicon Development Co. L.L.C. Batch sludge dehydrator
US6189234B1 (en) * 1998-04-08 2001-02-20 International Technology Systems, Inc. Continuous flow fluid bed dryer
WO2004056549A1 (en) * 2002-12-20 2004-07-08 Akzo Nobel N.V. Method and device for pre- expanding thermoplastic microspheres
US20040176487A1 (en) * 2002-12-20 2004-09-09 Lars-Olof Svedberg Method and expansion device for preparing expanded thermoplastic microspheres
US20040200091A1 (en) * 2001-05-16 2004-10-14 Asbjorn Strand Process and means for drying of sticky materials
US20050282014A1 (en) * 2004-06-17 2005-12-22 Johnston Richard W Ultra low density thermally clad microspheres and method of making same
JP2018161643A (ja) * 2017-12-18 2018-10-18 佐竹化学機械工業株式会社 蒸発及び濃縮用の撹拌装置
WO2021116207A1 (en) 2019-12-09 2021-06-17 Hellenes Holding As Apparatus for continuous thermal separation of a multi-component substance
WO2021116201A1 (en) 2019-12-09 2021-06-17 Hellenes Holding As Method for continuous thermal separation of a multi-component substance

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SE410895B (sv) * 1978-03-16 1979-11-12 Vestsvensk En Teknik Kommandit Anordning for torkning av godsel och dylikt
DE3037875C2 (de) * 1979-10-11 1982-12-16 Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa Abstreichblatt für einen Dünnfilm-Trockner
JPS58168880A (ja) * 1982-03-30 1983-10-05 株式会社栗本鉄工所 伝導受熱型撹拌乾燥機
IT1248826B (it) * 1990-05-29 1995-01-30 Spada Massimiliano Essicatore continuo
JPH04138574U (ja) * 1991-06-05 1992-12-25 日立プラント建設株式会社 伝熱管の固定装置
FR2694218B1 (fr) * 1992-07-30 1994-09-23 Sundgau Sarl Atelier Const Ele Procédé et dispositif pour traiter des boues à stocker.
DE4227541A1 (de) * 1992-08-20 1994-02-24 Loedige Maschbau Gmbh Geb Verfahren und Vorrichtung zum Erhitzen von Schüttgut auf hohe Temperaturen
CN110902904B (zh) * 2019-11-29 2022-03-01 扬州工业职业技术学院 一种污水净化、过滤、杀菌装置

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US2452249A (en) * 1946-03-04 1948-10-26 Roy R Leiske Drier for granular plastic
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US3230865A (en) * 1962-06-22 1966-01-25 Ruhrchemie Ag Process and device for removing liquids from solids
US3323222A (en) * 1965-02-17 1967-06-06 Welding Engineers Apparatus and method for dewatering and drying rubber
US3603001A (en) * 1969-03-17 1971-09-07 Gerald D Arnold Agricultural dehydrating and cooling system
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US2510057A (en) * 1944-04-24 1950-06-06 Inst Divi Thomae Foundation Evaporator
US2452249A (en) * 1946-03-04 1948-10-26 Roy R Leiske Drier for granular plastic
US3222797A (en) * 1961-02-17 1965-12-14 Int Basic Economy Corp Methods for the removal of moisture from polymeric materials
US3230865A (en) * 1962-06-22 1966-01-25 Ruhrchemie Ag Process and device for removing liquids from solids
US3323222A (en) * 1965-02-17 1967-06-06 Welding Engineers Apparatus and method for dewatering and drying rubber
US3603001A (en) * 1969-03-17 1971-09-07 Gerald D Arnold Agricultural dehydrating and cooling system
US3717937A (en) * 1971-04-19 1973-02-27 S Thompson Flighting for dehydrator drum
US3720004A (en) * 1971-10-15 1973-03-13 Okawara Mfg Rotary drier for sludge

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452076A1 (fr) * 1979-03-21 1980-10-17 Richter Gedeon Vegyeszet Equipement pour le sechage et la granulation de matieres humides, pateuses et/ou fusibles
US4420892A (en) * 1979-03-23 1983-12-20 Bayer Aktiengesellschaft Thin film contact dryer
US4274342A (en) * 1979-07-16 1981-06-23 Nider William K Apparatus for carbonizing an agricultural product
US4274344A (en) * 1979-07-16 1981-06-23 Nider William K Process for carbonizing an agricultural product
US4668183A (en) * 1984-11-29 1987-05-26 Gieberei Kohlscheid GmbH Lifting element for pipe coolers for material produced at least partially in lumps
US4750274A (en) * 1987-01-27 1988-06-14 Joy Manufacturing Co. Sludge processing
US4980030A (en) * 1987-04-02 1990-12-25 Haden Schweitzer Method for treating waste paint sludge
WO1995018946A1 (en) * 1992-11-17 1995-07-13 Thermtech A/S A process and a device in drying of organic and/or unorganic materials
RU2125217C1 (ru) * 1992-11-17 1999-01-20 Термтек А/С Процесс и устройство для сушки или органических и/или неорганических материалов
AU682860B2 (en) * 1994-01-07 1997-10-23 Thermtech A/S A process and a device in drying of organic and/or unorganic materials
US5724751A (en) * 1994-01-07 1998-03-10 Thermtech A/S Process and apparatus for drying organic or inorganic materials
US5660124A (en) * 1995-09-20 1997-08-26 Alar Engineering Corporation Sludge processor
US5802992A (en) * 1995-09-20 1998-09-08 Alar Engineering Corporation Sludge processor
WO1998015791A1 (en) * 1996-10-08 1998-04-16 Atlas-Stord Denmark A/S Circular drying element and drying plant with such a drying element
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Also Published As

Publication number Publication date
JPS5529352B1 (de) 1980-08-02
DE2228682A1 (de) 1973-01-18
GB1401195A (en) 1975-07-16
DE2228682B2 (de) 1977-04-07
NL174582C (nl) 1984-07-02
FR2144282A5 (de) 1973-02-09
PL84860B1 (de) 1976-04-30
AT335362B (de) 1977-03-10
NL7209039A (de) 1973-01-03
BE785439A (fr) 1972-10-16
IT959902B (de) 1973-11-10
AU4398472A (en) 1974-01-03
CH535413A (de) 1973-03-31
AU475024B2 (en) 1976-08-12
ATA509472A (de) 1976-06-15
DD97743A5 (de) 1973-05-12
NL174582B (nl) 1984-02-01
SE392962B (sv) 1977-04-25

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