EP3767212A1 - Verbesserte vorrichtung zum trocknen einer wasserhaltigen mischung - Google Patents

Verbesserte vorrichtung zum trocknen einer wasserhaltigen mischung Download PDF

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Publication number
EP3767212A1
EP3767212A1 EP20186736.3A EP20186736A EP3767212A1 EP 3767212 A1 EP3767212 A1 EP 3767212A1 EP 20186736 A EP20186736 A EP 20186736A EP 3767212 A1 EP3767212 A1 EP 3767212A1
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EP
European Patent Office
Prior art keywords
entraining
mixture
long side
panels
structures
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Withdrawn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
EP20186736.3A
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English (en)
French (fr)
Inventor
Lieven André Eric Depraetere
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.)
Spiessens bvba
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Spiessens bvba
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Filing date
Publication date
Application filed by Spiessens bvba filed Critical Spiessens bvba
Publication of EP3767212A1 publication Critical patent/EP3767212A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
    • 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
    • F26B17/28—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rollers or discs with material passing over or between them, e.g. suction drum, sieve, the axis of rotation being in fixed position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/04—Agitating, stirring, or scraping devices
    • 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

Definitions

  • the present invention relates on the one hand to a device for drying a water-containing mixture, comprising a storage vessel for the mixture, a rotor rotatable via a rotating shaft, provided with a number of entraining structures suitable for entraining a portion of the mixture and a drive device for rotatably driving the rotating shaft.
  • the present invention relates to an entraining structure suitable for fitting in the device according to the invention.
  • the flotation thickener consists of a tank into which tiny air bubbles are blown, in order to obtain separation between the dry material and the water that is present.
  • a third technique is mechanical thickening, wherein water separation takes place by means of mechanical forces, so that in comparison with the aforementioned techniques, higher dry matter contents are attainable.
  • the present invention relates in particular to a mechanical thickener of this kind.
  • a number of (drying) devices are known for thickening water-containing mixtures mechanically.
  • a sieve belt or thickening table is known, wherein the mixture to be thickened is poured onto a movable endless belt. Owing to the sieving action of the belt, the mixture can as it were leak out.
  • the mixture to be thickened is poured into a container.
  • This container is provided with a number of successive perforated conveyor belts, which extend partially into the mixture. Thickening is achieved by conveying the mixture via the conveyor belts outside the mixture and then drying the mixture by passing an air stream through the perforations.
  • this type of thickening has the disadvantage that the conveyor belts are highly susceptible to wear.
  • the various components (e.g. shafts, ball bearings) of the device may be affected or contaminated by the mixture to be thickened, so that these components jam and have to be replaced regularly.
  • EP 3 163 239 describes a drying device for a mixture of a liquid and one or more solid substances, comprising a receiving bin for the mixture, a rotor mounted with a part of its perimeter in the container and a drive device for rotatably driving the rotor, wherein the rotor is provided with a plurality of grid-shaped entraining elements, wherein at least some of the entraining elements have a configuration in which relatively narrow entraining elements alternate with relatively wide entraining elements in the peripheral direction of the rotor and/or wherein at least some of the entraining elements are provided with several through holes, the opening region of which is at least 800 mm 2 .
  • this device has the disadvantage that owing to the presence of the relatively narrow entraining elements, the drying capacity decreases whenever the receiving bin is not completely filled with the mixture. Furthermore, less mixture is entrained by the entraining elements as a result of the relatively large through holes, which has a negative effect on drying.
  • the patent holder has already developed a device for drying a water-containing mixture in the past, as defined at the beginning of the first claim.
  • This device is described in European patent EP 2 096 394 .
  • EP 2 096 394 it is known to pass a warm air stream over the surface of the entraining elements in order to create a greater drying effect.
  • the relative humidity (RH) thereof will decrease appreciably, for example when the incoming outside air has an RH of 70% this will decrease to 10% when it is heated to about 70 to 80°C.
  • Hot air can take up more moisture. Take-up of moisture (water) occurs during thickening.
  • the aim of the present invention is to provide a device in which evaporation of the mixture on the entraining elements is optimized so that the outgoing air stream is almost completely saturated with water vapour, preferably has an RH of 90%, more particularly an RH of 95%, and most particularly is completely saturated (RH 100%).
  • the aim of the invention is achieved by providing a device for drying a water-containing mixture, comprising a storage vessel for the mixture, a rotor, rotatable via a rotating shaft, provided with a number of entraining structures suitable for entraining a portion of the mixture and a drive device for rotatably driving the rotating shaft, wherein at least a number of said entraining structures are formed from at least one panel of metal gauze of the expanded metal type.
  • the aforementioned water-containing mixture is preferably a mixture of a liquid and one or more solid constituents (substances).
  • a panel of expanded metal is formed by making slits (cuts, slots) in a metal plate and then stretching ("expanding") the cold metal plate until diamond-shaped meshes are formed.
  • the mesh-plate gauze forms a continuous whole without interweaving (woven or welded wires).
  • the structure formed (mesh-plate gauze) is difficult to deform, very sturdy and rigid.
  • the entraining structure may comprise one, two, three or more such panels. An entraining structure with two panels of metal gauze of the expanded metal type is preferred.
  • the entraining structures comprise a first long side and, located opposite the first long side, a second long side, said long sides extending in a direction coinciding with the direction of the rotating shaft, wherein the entraining structures are positioned in such a way that the first long side is located closer to the rotating shaft than the second long side. More particularly, said entraining structures have a radial orientation with respect to the rotating shaft of the rotor.
  • At least a number of said entraining structures are formed from at least two panels of metal gauze of the expanded metal type, positioned one above the other.
  • the device comprises a portion of entraining structures formed from single panels of metal gauze of the expanded metal type and a portion of entraining structures formed from at least two panels of metal gauze of the expanded metal type, positioned one above the other. More particularly, all entraining structures are formed from at least two panels of metal gauze of the expanded metal type, positioned one above the other.
  • the aforementioned panels of one and the same entraining structure are displaced with respect to each other. Because the panels are displaced with respect to each other, the mesh opening of the one panel will be partly overlapped by the mesh opening of the panel placed above it. As a result, in operation, a turbulent flow will be generated when the surrounding air comes into contact with the entraining structure. This also results in increased contact time of the air with the entraining elements, which also has a positive effect on evaporation, so that the relative humidity of the air in the device will also increase.
  • the panels of one and the same entraining structure on the second long side are placed at a greater distance from each other than on the first long side, so that the entraining structure is of wing-shaped configuration.
  • the entraining structures are positioned in such a way that the first long side is located closer to the rotating shaft than the second long side. Owing to the design (wing shape) of the entraining structure, the liquid molecules on the upper side of the entraining structures will move more quickly than those on the underside (Venturi effect) so that above the entraining structure there is a lower pressure, which as it were give the entraining structures a lift effect so that they move more easily out of the mixture.
  • the panels of an entraining structure are joined together at the level of the first long side by a fastening profile.
  • the entraining structure comprises a holder or frame, which is formed by inter alia the fastening profile and two transverse profiles, provided for resting against the transverse sides (short sides) of the panels.
  • the fastening profile extends between the two transverse profiles.
  • the fastening profile is located on the first long side of the entraining structure.
  • the corresponding ends of the two panels are secured to this fastening profile, preferably by a welded joint. Because both panels are fastened to the same profile, the two panels are close together at the level of the first long side.
  • the panels are mounted at a distance from each other.
  • the transverse profiles are preferably provided with two supporting blocks placed at a distance from each other, on which or against which the corresponding panel is fastened.
  • one or more distance pieces are provided at the level of the second long side, to join the two panels together with a clearance.
  • the entraining structures are movable in a closed revolution, and during a first portion of the revolution they are located in the mixture and during a second portion of the revolution they are located outside the mixture.
  • the device comprises ventilating means for generating an air stream directed towards the device in order to dry the entrained mixture during the second portion of its revolution.
  • the air stream directed towards the device preferably has a temperature of 80-90°C, preferably 85°C. This has the advantage that warmer air can take up more moisture.
  • the rotor is provided with a housing, wherein said housing comprises an inlet and an outlet for the air stream generated by the ventilating means.
  • the entraining structures are formed from aluminium, steel or stainless steel.
  • the present invention further relates to an entraining structure suitable for entraining a water-containing mixture, wherein said entraining structure comprises at least one panel of metal gauze of the expanded metal type.
  • the present invention further relates to an entraining structure suitable for entraining a water-containing mixture, wherein said entraining structure comprises at least two panels of metal gauze of the expanded metal type, positioned one above the other.
  • the entraining structures in question are preferably suitable for being fitted in a device according to the invention as described above.
  • the device (1) relates to a drying device for water-containing mixtures.
  • This device (1) may in particular be used for drying (thickening) a mixture of a liquid, preferably water, and one or more solid constituents (substances), such as manure, slurry, sludge, industrial effluents, etc.
  • the device (1) comprises a rotor (6) (see Fig. 2 ), which rotates via a rotating shaft (4) driven by driving means.
  • the rotor (6) is provided with a number of entraining structures (3) suitable for entraining a portion of the mixture.
  • Said entraining structures (3) are mounted fixed.
  • the entraining structures (3) are movable in a closed revolution and during a first portion of the revolution will be located in the mixture and during a second portion of the revolution will be located outside the mixture.
  • the entraining structures (3) are provided in order to entrain the mixture to be dried from the first portion to the second portion. In the second portion there is contact between the air and the mixture present on the entraining structure.
  • Fig. 3 is an illustration of an entraining structure (3) according to the invention.
  • the entraining structures (3) have a first long side (7) and a second long side (8) located opposite the first long side.
  • the long sides extend in a direction coinciding with the direction of the rotating shaft (4) of the rotor (6).
  • the entraining structures (3) are positioned in such a way that the first long side (7) is closer to the rotating shaft (4) than the second long side (8).
  • the entraining structures have a radial orientation with respect to the rotating shaft (4) of the rotor (6).
  • the entraining structure (3) is preferably formed from one or more, in particular from a number of, preferably two or three, panels (5a;5b) of metal gauze of the expanded metal type, which are placed on one another.
  • the one panel is positioned relative to the other panel in such a way that a wing shape is created.
  • each entraining structure comprises two such panels (5a;5b). Obviously the number of panels may be extended.
  • the expanded metal is preferably made from mild steel, aluminium or stainless steel.
  • panels (mesh-plate gauze) with the following characteristics of the mesh (in mm): 62x20x6x1 (LDxSDxLxD). Wherein the abbreviations stand for: LD (long diagonal) / SD (short diagonal) / L (strip width or width of wall) / D (strip or material thickness). Such a panel has a free passage of 40.0%. Obviously these characteristics may vary depending on the panels used. Panels are preferred whose characteristics (in mm) are in the range between: 56x15x4x0.5 and 62x25x8x1.5, preferably between 60x15x5x0.5 and 64x20x8x1.
  • panels may optionally be used made of metal gauze of the expanded metal type with a higher strip thickness, panels being preferred having a strip thickness between 0.5 mm and 10 mm, more particularly between 1 mm and 7 mm, preferably between 1.5 mm and 7 mm or between 1.5 mm and 6 mm or between 2 mm and 5 mm.
  • the entraining structure (3) has a length between 2500 and 3500 mm, preferably 2835 mm and a width between 500 mm and 900 mm, preferably 700 mm.
  • the panels are placed at a greater distance from each other than at the level of the first long side (7).
  • the entraining structure (3) assumes the shape of a wing.
  • the entraining structures (3) are positioned in the device in such a way that the first long side (7) is located closer to the rotating shaft than the second long side (8).
  • the liquid molecules on the upper side of the entraining structures will move more quickly than those on the underside, so that there is a lower pressure above the entraining structure, which as it were gives the entraining structures a lift effect so that they move more easily out of the mixture.
  • the entraining structure (3) comprises a holder that is formed by a fastening profile (10) and two transverse profiles (11), configured to lie against the transverse sides (short sides) of the panels.
  • the fastening profile (10) extends between the two transverse profiles (11).
  • the fastening profile (10) is located at the level of the first long side (7) of the entraining structure (3).
  • the corresponding ends of the two panels are secured to this fastening profile (10), preferably by a welded joint. Because both panels (5a;5b) are fastened to the same profile (10), the two panels are close together at the level of the first long side. On the opposite (second) long side, the panels are farther apart.
  • the panels are mounted at a distance from each other.
  • the transverse profiles (11) are provided with two supporting blocks placed at a distance from each other (12, 13), on which or against which the corresponding panel is fastened.
  • one or more distance pieces are provided at the level of the second long side, in order to join the two panels together with a clearance. These distance pieces are preferably made of stainless steel.
  • the entraining structures (3) will be submerged one by one and at least partially (first portion) in the mixture provided in the storage vessel (2).
  • the entraining elements (3) are submerged completely in the mixture provided in the storage vessel (2).
  • some of the mixture will remain on the panel structure and will be carried away to the second portion, where the entrained mixture can dry out.
  • the device (1) is further provided with ventilating means (not shown) for generating an air stream directed towards the device (1) in order to dry the mixture entrained by the entraining structures during the second portion of its revolution.
  • This air stream is preferably a warm air stream and may for example be derived from an electrical installation, chimney flue gases, animal house air, etc.
  • the rotor is provided with a housing (2) (see Fig. 1 ), wherein said housing (2) comprises an inlet and an outlet for the air stream generated by the ventilating means.
  • the rotor (6) is installed in such a way that only the panel-shaped entraining structures (3) come into contact with the mixture. Therefore stoppages on account of affected or contaminated components are kept to a minimum.
  • entraining structures may be provided, preferably 80 to 90, more particularly 86 entraining structures (86 entraining structures will mean that 172 panels of expanded metal are present), so that on the one hand a large amount of mixture to be dried can be entrained, and on the other hand, compared to the known thickeners, a much larger contact surface is created between the air (preferably heated) and the liquid (mixture) on the entraining structures in the second portion of the revolution.
  • the form and structure will ensure that much more liquid (molecules) can be emitted, so that the air present in the housing becomes saturated, preferably to an RH of 100%. This is a considerable improvement relative to the known mechanical thickeners, where in practice a saturation percentage of the outgoing air stream of about 60% was achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP20186736.3A 2019-07-19 2020-07-20 Verbesserte vorrichtung zum trocknen einer wasserhaltigen mischung Withdrawn EP3767212A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20195473A BE1027387B1 (nl) 2019-07-19 2019-07-19 Verbeterde inrichting voor het drogen van een waterhoudend mengsel

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EP3767212A1 true EP3767212A1 (de) 2021-01-20

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EP20186736.3A Withdrawn EP3767212A1 (de) 2019-07-19 2020-07-20 Verbesserte vorrichtung zum trocknen einer wasserhaltigen mischung

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4272851A1 (de) * 2022-05-06 2023-11-08 Fliegl Agrartechnik GmbH Trocknungsvorrichtung
EP4272850A1 (de) * 2022-05-06 2023-11-08 Fliegl Agrartechnik GmbH Trocknungsvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351283A (en) * 1998-10-30 2000-12-27 Lawrence Thomas Doyle Treating waste material
EP2096394A1 (de) 2008-02-27 2009-09-02 Majast bvba Vorrichtung zur Trocknung eines wasserhaltigen Gemisches
JP2011251238A (ja) * 2010-06-01 2011-12-15 Daio Paper Corp 含水物の破砕機及び再生粒子の製造方法
DE202015105780U1 (de) * 2015-10-30 2015-11-11 Josef Fliegl jun. Trocknungsvorrichtung
CN207662109U (zh) * 2017-11-03 2018-07-27 焦作市真节能环保设备科技有限公司 三级滚筒式粘湿物料烘干机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351283A (en) * 1998-10-30 2000-12-27 Lawrence Thomas Doyle Treating waste material
EP2096394A1 (de) 2008-02-27 2009-09-02 Majast bvba Vorrichtung zur Trocknung eines wasserhaltigen Gemisches
JP2011251238A (ja) * 2010-06-01 2011-12-15 Daio Paper Corp 含水物の破砕機及び再生粒子の製造方法
DE202015105780U1 (de) * 2015-10-30 2015-11-11 Josef Fliegl jun. Trocknungsvorrichtung
EP3163239A1 (de) 2015-10-30 2017-05-03 Fliegl Agrartechnik GmbH Trocknungsvorrichtung
CN207662109U (zh) * 2017-11-03 2018-07-27 焦作市真节能环保设备科技有限公司 三级滚筒式粘湿物料烘干机

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4272851A1 (de) * 2022-05-06 2023-11-08 Fliegl Agrartechnik GmbH Trocknungsvorrichtung
EP4272850A1 (de) * 2022-05-06 2023-11-08 Fliegl Agrartechnik GmbH Trocknungsvorrichtung

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BE1027387B1 (nl) 2021-03-05
BE1027387A1 (nl) 2021-01-26

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