WO2024084315A1 - Système et procédé de traitement d'un corps de produit - Google Patents

Système et procédé de traitement d'un corps de produit Download PDF

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Publication number
WO2024084315A1
WO2024084315A1 PCT/IB2023/059760 IB2023059760W WO2024084315A1 WO 2024084315 A1 WO2024084315 A1 WO 2024084315A1 IB 2023059760 W IB2023059760 W IB 2023059760W WO 2024084315 A1 WO2024084315 A1 WO 2024084315A1
Authority
WO
WIPO (PCT)
Prior art keywords
processing station
fluid
arrangement
belt
inlet
Prior art date
Application number
PCT/IB2023/059760
Other languages
English (en)
Inventor
Werner Hartmut Altmann
Reindert Buisman
Original Assignee
The Warb Trust (No.1 Trust 13337/99)
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
Application filed by The Warb Trust (No.1 Trust 13337/99) filed Critical The Warb Trust (No.1 Trust 13337/99)
Publication of WO2024084315A1 publication Critical patent/WO2024084315A1/fr

Links

Classifications

    • 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
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure

Definitions

  • This invention relates to a system and method of processing a body of product, more particularly by dehydrating or calcinating the product body.
  • One such a system comprises a perforated belt, a drive arrangement and a processing station.
  • the processing station comprises a heating arrangement located adjacent a first surface of the belt and a suction arrangement located adjacent an opposite surface of the belt.
  • the belt is driven in a first direction by the drive arrangement.
  • the body of product is discharged on the first surface of the belt and then conveyed past the processing station.
  • the heating arrangement irradiates the product body with heat while the suction arrangement causes a flow of heated air through the processing station.
  • the heated air flow ensures that moisture entrained thereby is discharged from the processing station.
  • the known systems simply discharges and discards the heated moisture entrained air.
  • the known systems and methods suffer from the disadvantage that their efficiency is not optimized for at least some applications.
  • a system for processing a product body comprising:
  • a perforated belt having a first surface and an opposite surface, the first surface for receiving and holding the product body
  • a heating arrangement for heating the product body held by the belt, the heating arrangement being located adjacent the first surface of the belt; o a suction arrangement for removing a first fluid from the processing station, the suction arrangement being located opposite the heating arrangement and adjacent the opposite surface of the belt; and o a fluid discharge arrangement for discharging into the first processing station a second heated fluid;
  • Non-limiting examples of processing as used herein are calcination and/or dehydration.
  • Calcination refers to thermal treatment of a body of a chemical compound whereby the temperature of the body is raised to an elevated level without melting the compound, for at least one of the following purposes: incurring thermal decomposition of the compound; and removing impurities or volatile substances from the compound.
  • Dehydration refers to the at least partial loss or removal of liquid, typically water, from something, particularly the product body.
  • Product body refers to any one of a) a body of sludge and b) a body comprising mineral-containing particulate material.
  • the body may take the form of a cake or bed or agglomerated product such as extrusions, briquettes or granules.
  • the suction arrangement may comprise a sump defining an inlet opening for receiving the first fluid and an outlet for discharging the first fluid from the sump.
  • the suction arrangement may comprise a fluid displacement means having an intake and an exhaust. The intake of the fluid displacement means may be connected to the outlet of the sump.
  • the fluid displacement means may comprise any one of: a fan, blower, vacuum pump and means utilizing airflow under pressure, to generate suction or a negative pressure.
  • the fluid displacement means may cause the first fluid to flow from the inlet opening, through the outlet of the sump and to the intake of the fluid displacement means.
  • the fluid discharge arrangement may be located in or at the inlet of the sump and the belt, at the at least one processing station, may move over the fluid discharge arrangement.
  • the belt may be supported by the fluid discharge arrangement.
  • the discharge arrangement may define a discharge arrangement inlet for receiving the second heated fluid and may comprise at least one elongate tube having opposed first and second ends, the at least one elongate tube defining at least one discharge opening towards the first end of the tube.
  • the at least one elongate tube defines a second discharge opening towards the second end of the tube.
  • the at least one elongate tube may be rectangular or square in transverse crosssection.
  • the at least one tube may be made of stainless steel and may at least partially be coated with a ceramic.
  • the at least one elongate tube preferably forms part of a grid of parallel and similar elongate tubes.
  • the discharge arrangement may comprise a manifold defining the discharge arrangement inlet, the manifold distributing the second fluid between the plurality of elongate tubes.
  • the grid of elongate tubes may be covered with ceramic tiles.
  • the first processing station may comprise a heat exchanger having an inlet for receiving a fluid to be heated and to provide at an outlet thereof the second heated fluid.
  • the heat exchanger may be located within the sump.
  • the outlet of the heat exchanger may be connected to the inlet of the fluid discharge arrangement.
  • the heat exchanger may comprise stainless steel piping coated with a ceramic.
  • the drive arrangement may be configured to drive the belt in a first direction past the first processing station.
  • the system may comprise a second processing station located down-stream from the first processing station with reference to the first direction.
  • the second and downstream processing station may be similar in configuration to the first processing station.
  • the inlet of the heat exchanger of the first processing station may be connected to the exhaust of the fluid displacement means of the down-stream processing station.
  • the first processing station may not necessarily comprise a heat exchanger and the inlet of the discharge arrangement of the first processing station may be connected to the exhaust of the fluid displacement means of the down-stream processing station.
  • the inlet of the heat exchanger of the first processing station may be connected to a source of fresh air.
  • the system may comprise a third processing station located upstream from the first processing station with reference to the first direction.
  • the upstream processing station may be similar in configuration to the first processing station.
  • the inlet of the heat exchanger of the upstream processing station may be connected to the exhaust of the fluid displacement means of the first processing station.
  • the upstream processing station may not necessarily comprise a heat exchanger and the exhaust of the fluid displacement means of the first processing station may be connected to the inlet of the discharge arrangement of the upstream processing station.
  • the processing station may comprise ceramic tiles.
  • the tiles may be located between the discharge arrangement and the perforated belt.
  • the perforated belt may be an endless steel belt, the first surface being a top surface and the opposite surface being a bottom surface.
  • the perforated belt may comprise warp and weft wires of steel.
  • the belt may be coated with a ceramic.
  • the heating arrangement may comprise at least one of: a microwave emitting source; and an infrared wave emitting source.
  • a method of processing a product body comprising:
  • figure 1 is a diagrammatic side view of an example embodiment of a system for processing a product body
  • figure 2 is a diagrammatic perspective view of the processing system with parts removed for better clarity
  • figure 3 is a section on line III in figure 2
  • figure 4 is a diagrammatic perspective view from below of a fluid discharge arrangement
  • figure 5 is a diagrammatic perspective view from above of the fluid discharge arrangement.
  • An example embodiment of a system for processing a product body 12 by any one or both of dehydration and calcination of the product body 12 is generally designated by the reference numeral 10 in figures 1 and 2.
  • the system 10 comprises a perforated belt 14, at least a first processing station 16 and a drive arrangement 18.1 to 18.4 for displacing the belt 14 relative to the at least first processing station 16.
  • the belt 14 has a first surface 20 for receiving and holding the product body 12 and an opposed surface 22.
  • the first surface 20 is typically a top surface and the opposed surface 22 is typically a bottom surface.
  • the first processing station 16 comprises a heating arrangement 24, a suction arrangement 26 and a fluid discharge arrangement 28.
  • the heating arrangement 24 is located adjacent the top surface 20 of the belt 14. In use, the heating arrangement 24, heats the product body 12 held by the belt 14.
  • the suction arrangement 26 is located opposite the heating arrangement 24 and adjacent the bottom surface 22 of the belt 14. In use, the suction arrangement 26 removes a first fluid (not shown) from the first processing station 16.
  • the fluid discharge arrangement 28 discharges a second heated fluid 30 into the first processing station 16.
  • the suction arrangement 26 comprises a sump 32 and a fluid displacement means 34. As best shown in figure 1 , the sump 32 defines an inlet opening 36 for receiving the first fluid and an outlet 38 for discharging the first fluid from the sump 32.
  • the fluid displacement means 34 has an intake 40 and an exhaust 42.
  • the intake 40 is connected to the outlet 38 of the sump 32.
  • the fluid displacement means 34 may be any one of: a fan, blower, vacuum pump and means utilizing airflow under pressure, to generate suction or a negative pressure.
  • the fluid displacement means 34 causes the first fluid to flow along a path A from the inlet opening 36 to the outlet 38 of the sump 32. From the outlet 38, the fluid sequentially flows to the intake 40, through the fluid displacement means 34 and out at the exhaust 42.
  • the discharge arrangement 28 comprises at least one elongate tube 44 having opposed first and second ends 46 and 48, respectively.
  • the elongate tube 44 preferably forms part of a grid 49 of parallel and similar elongate tubes.
  • grid 49 defines an inlet 50 for receiving the second heated fluid 30 and discharge openings 52 and 54 (shown in figure 5) for discharging the second heated fluid 30 into the first processing station 16.
  • the first and second discharge openings 52 and 54 are located towards the first and second ends 46 and 48 respectively.
  • the elongate tube 44 is square in transverse cross section and is typically made of stainless steel and coated with a ceramic.
  • the grid 49 comprises a manifold 56 (shown in figure 4) for distributing the second heated fluid 30 along a network B (shown in figure 5) within the elongate tubes 44.
  • the manifold defines the inlet 50 of the discharge arrangement 28.
  • the grid 49 further comprises a plurality first and second end spacers 58 and 60 which are located between the first ends 46 and second ends 48 respectively. As best show in figures 2 and 5, the grid 49 is covered with ceramic tiles 61 .
  • the grid 49 may comprise first and second end tubes instead of the first and second end spacers 58 and 60.
  • the first end tube may join the first ends 46 together and the second end tube may join the second ends 48 together.
  • the first and second end tubes may define the above first and second discharge openings, respectively.
  • the fluid discharge arrangement 28 in the form of the grid 49 may be located in or at the inlet opening 36 of the sump 32 and, at the first processing station 16, the belt 14 may move over the grid 49.
  • the grid 49 may support the belt at the first processing station. Referring to figure 3, the first processing station 16 comprises a heat exchanger 62.
  • the heat exchanger 62 has an inlet 64 for receiving a fluid 65 to be heated and an outlet 66 for providing the second heated fluid 30 to the inlet 50 of the discharge arrangement 28.
  • the heat exchanger 62 is located within the sump 32.
  • the heat exchanger 62 is typically made of stainless steel piping which is coated with a ceramic. In the embodiment shown, (particularly figure 2) the piping is coiled in multiple layers to provide an enlarged outer surface area for the heat exchanger 62.
  • the drive arrangement 18 is configured to drive the belt 14 in a first direction C past the first processing station 16.
  • the system 10 may comprise a second processing station 116 located downstream of the first processing station 16, with reference to the direction C.
  • the downstream processing station 116 may be similar in configuration to the first processing station 16.
  • the downstream processing station 116 does not comprise a heat exchanger and, instead of a fluid discharge arrangement, comprises a support grid 67 which is similar in structure to the fluid discharge arrangement 28, but does not define discharge openings.
  • Like parts of the downstream processing station 116 are indicated by like reference numerals.
  • the inlet 64 of the heat exchanger 62 of the first processing station 16 is connected to the exhaust 42 of the fluid displacement means 34 of the downstream processing station 116.
  • the inlet 50 of the discharge arrangement 28 of the first processing station 16 may be connected directly to the exhaust 42 of the fluid displacement means 34 of the downstream processing station 116.
  • the inlet 64 of the heat exchanger 62 of the first processing station may be connected to a source of fresh air (not shown).
  • the system 10 may comprise a third processing station 216 located upstream of the first processing station 16 with reference to the first direction C.
  • the upstream processing station 216 is similar in configuration to the first processing station 16 and like parts are indicated by like reference numerals.
  • the inlet (not shown) of the heat exchanger 62 of the upstream processing station 216 is connected to the exhaust 42 of the fluid displacement means 34 of the first processing station 16.
  • the outlet 66 is connected to the inlet (not shown) of the fluid discharge arrangement 28 of the upstream processing station 216.
  • the exhaust 42 is connected to a recycling tank 68.
  • the inlet 50 of the discharge arrangement of the upstream processing station 216 may be connected directly to the exhaust 42 of the fluid displacement means 34 of the first processing station 16.
  • the belt 14 is an endless belt.
  • the belt 14 typically comprises warp and weft members made of stainless steel and which are coated with a ceramic.
  • the product body 12 is discharged onto the belt 14.
  • the belt 14 is displaced relative to the processing stations 216, 16 and 1 16 in the first direction C by the drive arrangement 18.1 to 18.4.
  • the product body 12 is conveyed by the belt 14 sequentially past the upstream processing station 216, the first processing station 16 and the downstream processing station 116.
  • the product body 12 is heated by the respective heating arrangement 24 and fluid is purged from the product body 12 and removed from the processing stations 216, 16 and 116 by the respective suction arrangements 26.
  • the fluid which is removed from the processing stations 16 contains some stored thermal energy.
  • the fluid which is removed by the suction arrangement 26 of the downstream processing station 116 is introduced at the inlet 64 of the heat exchanger 62 of the first processing station 16.
  • the first fluid flowing along the path A provides thermal energy to the heat exchanger 62 of the first processing station 16, which in turn transfers some of the thermal energy to the fluid 65 to be heated.
  • the fluid 65 flows through the heat exchanger 62 of the first processing station 16, the fluid is heated further.
  • the heat exchanger 62 of the first processing station 16, at the outlet 66 thereof provides the second heated fluid 30 to the inlet 50 of the discharge arrangement 28 of the first processing station 16.
  • the fluid removed from the downstream processing station 116 By using, at the first processing station 16, the fluid removed from the downstream processing station 116, at least some of the stored thermal energy is utilized to calcinate the product body 12. In turn, this may contribute to a higher energy efficiency of the system 10. To contribute further to the higher energy efficiency of the system 10, the fluid removed from the first processing station 16 is used in a similar manner at the upstream processing station 216. Using the thermal energy of the first fluid flowing along the path A, may also contribute to the higher energy efficiency of the system 10.
  • the system 10 may comprise a second processing station (not shown) which may be similar in configuration to the first processing station.
  • the second processing station may be located adjacent to and downstream of the first processing station, with reference to direction C.
  • the system 10 may comprise a third processing station (not shown) which may be similar in configuration to the first processing station 16.
  • the third processing station may be located adjacent to and upstream of the first processing station, with reference to direction C.
  • Each processing station may receive fresh air at a respective inlet 64 of the respective processing station.
  • the invention also extends to a method for processing a product body 12 by any one of dehydration and calcination.
  • the method comprises conveying the product body 12 past at least a first processing station 16, purging a first fluid (not shown) from the product body 12 by irradiating the product body 12 with a heating arrangement 24, extracting the purged first fluid from the processing station 16 and discharging a second heated fluid 30 within the processing station 16 to enhance the purging.
  • system may comprise any number of upstream and downstream processing stations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Un système (10) de traitement d'un corps de produit comprend une courroie perforée (14), au moins une première station de traitement (16) et un agencement d'entraînement (18.1 à 18.4) pour déplacer la courroie (14) par rapport à la première station de traitement (16). La première station de traitement (16) comprend un agencement de chauffage (24), un agencement d'aspiration (26) et un agencement de décharge de fluide (28). L'agencement de chauffage (24) est situé adjacent à la surface supérieure (20) de la courroie (14). Lors de l'utilisation, l'agencement de chauffage (24) chauffe le corps de produit (12) maintenu par la courroie (14). L'agencement d'aspiration (26) se situe à l'opposé de l'agencement de chauffage (24) et est adjacent à la surface inférieure (22) de la courroie (14). Lors de l'utilisation, l'agencement d'aspiration (26) élimine un premier fluide de la première station de traitement (16). L'agencement de décharge de fluide (28) décharge un second fluide chauffé (30) dans la première station de traitement (16).
PCT/IB2023/059760 2022-10-20 2023-09-29 Système et procédé de traitement d'un corps de produit WO2024084315A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2022/11472 2022-10-20
ZA202211472 2022-10-20

Publications (1)

Publication Number Publication Date
WO2024084315A1 true WO2024084315A1 (fr) 2024-04-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1404553B1 (de) * 1958-02-19 1970-07-02 Spooner Dryer & Engineering Co Vorrichtung zum Trocknen von aus Papierstoff oder anderem leicht deformierbarem Stoff geformten Gegenstaenden geringen Gewichts
US4784878A (en) * 1987-04-06 1988-11-15 Damrow Company, Inc. Spray drying method and apparatus for concurrent particle coating
US20040206709A1 (en) * 2001-05-31 2004-10-21 Reindert Buisman Dehydrating press for a sludge
US20080184589A1 (en) * 2007-02-02 2008-08-07 The Shivvers Group, Inc., An Iowa Corporation High efficiency drier with heating and drying zones
CA2986740A1 (fr) * 2016-12-11 2018-06-11 Stela Laxhuber Gmbh Sechoir a flux continu destine a secher un materiau au moyen d'air chaud, comportant au moins deux sections

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1404553B1 (de) * 1958-02-19 1970-07-02 Spooner Dryer & Engineering Co Vorrichtung zum Trocknen von aus Papierstoff oder anderem leicht deformierbarem Stoff geformten Gegenstaenden geringen Gewichts
US4784878A (en) * 1987-04-06 1988-11-15 Damrow Company, Inc. Spray drying method and apparatus for concurrent particle coating
US20040206709A1 (en) * 2001-05-31 2004-10-21 Reindert Buisman Dehydrating press for a sludge
US20080184589A1 (en) * 2007-02-02 2008-08-07 The Shivvers Group, Inc., An Iowa Corporation High efficiency drier with heating and drying zones
CA2986740A1 (fr) * 2016-12-11 2018-06-11 Stela Laxhuber Gmbh Sechoir a flux continu destine a secher un materiau au moyen d'air chaud, comportant au moins deux sections

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