EP2453192A2 - Séchoir à colonne pour le séchage de produits en vrac - Google Patents

Séchoir à colonne pour le séchage de produits en vrac Download PDF

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Publication number
EP2453192A2
EP2453192A2 EP11188852A EP11188852A EP2453192A2 EP 2453192 A2 EP2453192 A2 EP 2453192A2 EP 11188852 A EP11188852 A EP 11188852A EP 11188852 A EP11188852 A EP 11188852A EP 2453192 A2 EP2453192 A2 EP 2453192A2
Authority
EP
European Patent Office
Prior art keywords
dryer
air
roof
horizontal
air duct
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Withdrawn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
EP11188852A
Other languages
German (de)
English (en)
Other versions
EP2453192A3 (fr
Inventor
Jochen Mellmann
Fabian Weigler
Holger Scaar
Teodor Teodorov
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.)
Leibniz Institut fuer Agrartechnik und Biooekonomie eV
Original Assignee
Leibniz-Institut fur Agrartechnik Potsdam-Bornimev
Leibniz Institut fuer Agrartechnik Potsdam Bornim eV
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 claimed from DE102010043873A external-priority patent/DE102010043873A1/de
Application filed by Leibniz-Institut fur Agrartechnik Potsdam-Bornimev, Leibniz Institut fuer Agrartechnik Potsdam Bornim eV filed Critical Leibniz-Institut fur Agrartechnik Potsdam-Bornimev
Priority to EP11188852.5A priority Critical patent/EP2453192A3/fr
Publication of EP2453192A2 publication Critical patent/EP2453192A2/fr
Publication of EP2453192A3 publication Critical patent/EP2453192A3/fr
Withdrawn legal-status Critical Current

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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
    • F26B17/12—Machines 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
    • F26B17/14—Machines 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 moving through a counter-current of gas
    • F26B17/1408—Machines 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 moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
    • F26B17/1416—Machines 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 moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material the ducts being half open or perforated and arranged horizontally
    • 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
    • F26B17/12—Machines 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
    • F26B17/14—Machines 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 moving through a counter-current of gas
    • F26B17/1433—Machines 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 moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/06—Grains, e.g. cereals, wheat, rice, corn

Definitions

  • the present invention relates to a roof-shaft dryer for drying flowable bulk material.
  • bulk goods include, for example, cereals, legumes, rice and basic materials of the chemical industry.
  • Roof shaft dryers are constructed according to the modular principle of individual dryer sections, which are arranged one above the other.
  • a dryer section usually four horizontal rows of air ducts are housed.
  • Each horizontal row of air ducts also referred to as a roof row, can comprise up to sixteen complete air ducts. Since the air ducts often have a roof-shaped cross-section, they are also referred to as roofs and their arrangement as a roof row.
  • the Gutfeuchtever republic is the most important criterion.
  • the fluctuation range of the Gutfeuchte the Dryeraustrag is in the same order of magnitude as the absolute humidity difference between entry and discharge, ie before and after drying.
  • the number of supply air ducts should be equal to the number of exhaust ducts.
  • DEM discrete element method
  • the uniformity of the drying in a roof-shaft dryer is decisively determined by the number, the geometry, the arrangement and the assignment of the air ducts for supply air and exhaust air.
  • the DE 10 2007 028 781 A1 describes a roof duct dryer with a special diagonal arrangement of the supply and exhaust air ducts.
  • this change takes place according to this method in the diagonal direction.
  • the diagonal arrangement has the disadvantage of a poorer flow through the bed compared to the horizontal air duct arrangement. Due to the diagonal and simultaneously staggered arrangement of the air channels, dead zones form in the grain bed, which are not or hardly flowed through by the drying air. At the same air mass flow and the same number of air ducts, the average flow rate in the diagonal arrangement is also at least 1/3 higher than in the horizontal air duct arrangement, whereby the utilization rate of the drying potential of the air is lower. Both effects reduce the drying performance.
  • the DE 103 57 410 A1 discloses a roof duct dryer with horizontal air duct arrangement, which operates on the principle of cross countercurrent. While the material passes through the dryer from top to bottom, the drying air is passed from bottom to top alternately at different heights in different directions through the dryer shaft. At each change of direction there is an intermediate heating of the air. This allows the setting of a desired temperature profile above the dryer height and thus an adjustment to the product and moisture dependent, maximum allowable Guttemperaturen. The process favors a gentle product drying.
  • the heat exchanger for cooling as well as for heating of free-flowing solids is described.
  • the heat exchanger consists of a body, in the interior of which transversely to the conveying direction of the free-flowing solid tubular heat transfer elements are installed.
  • the heat transfer elements have an isosceles or equilateral triangular cross section. By the heat transfer elements, a heating or coolant flow is performed and thus realized an indirect heat transfer.
  • the US Pat. No. 7,188,436 B2 describes a cylindrical, vertically oriented and continuously operating gravity flow apparatus for heating and / or drying free-flowing solids, with an inlet on the top and an outlet on the bottom.
  • the flow zone of the material to be treated is located between an inner and an outer housing which are perforated to direct hot air through the packed bed. Both housings consist of alternately inclined cylindrical sections.
  • the invention has for its object to overcome the disadvantages of the prior art.
  • the object of the invention is therefore to provide a roof-shaft dryer, with which uniform drying conditions and thus uniform or at least comparable drying histories for bulk particles of different trajectories are achieved.
  • the terms “full” and “non-complete” air duct are used.
  • the complete air channels have
  • the maximum cross-section which is defined by the selected shape of the air duct, for example, an isosceles triangle.
  • Non-complete air channels have a cross-section which is smaller than that of the complete air channels by cutting the base.
  • the object of the present invention is achieved by providing a roof-shaft dryer for drying bulk material, which comprises superimposed dryer sections having a horizontal air duct arrangement, wherein the two side walls of the dryer sections parallel to the air duct arrangement are inclined by an angle ⁇ , which is defined by 5 ° ⁇ ⁇ 45 °.
  • the horizontal air duct arrangement comprises a plurality of horizontal rows of air ducts arranged one above the other, wherein the duct rows are arranged such that the centers of the air ducts in the respective duct rows are traversed by a diagonal which corresponds to the angle of inclination .theta.
  • a roof duct dryer in which the angle ⁇ is from 20 ° to 35 °.
  • Particularly preferred is a roof-shaft dryer in which the angle ⁇ is 25 °.
  • a particularly preferred embodiment of the roof-shaft dryer according to the invention is characterized in that each dryer section is provided with an even number of horizontal rows of air ducts.
  • a roof-shaft dryer in which each dryer section is provided with an odd number of horizontal rows of air ducts is advantageous.
  • Particularly preferred is an embodiment of the roof duct dryer according to the invention, in which each dryer section is provided with three horizontal rows of air ducts.
  • the roof duct dryer wherein the air duct arrangement causes a product flow division at the interface between two superposed dryer sections.
  • roof duct dryer according to the invention in which a product flow division takes place after each dryer section through the selected air duct arrangement.
  • the roof duct dryer according to the invention in which the dryer sections are equipped exclusively with complete air ducts.
  • the roof duct dryer according to the invention in which the dryer sections comprise incomplete air ducts, which are arranged on the side wall of the dryer section, under which the bed flows along.
  • This embodiment will be advantageous if, due to the desired drying result, drying of the cereal strands in the Wall area should not be waived.
  • the roof duct dryer then has according to the invention non-complete air ducts on one of the two side walls of the dryer section. These non-complete air ducts are according to the invention on the side wall of the dryer section, which does not or only slightly influenced the bulk material flow due to their inclination. Thus, if present, the incomplete air channels are located on the side wall of the dryer section under which the bed flows.
  • Fig. 1 shows the diagram of two dryer sections 2 of an embodiment of the roof duct dryer according to the invention. In each case, three horizontal rows of air ducts per dryer section are shown, with six complete air ducts being shown in each air duct row. Shown is the angle ⁇ , around which the side walls of the dryer sections are inclined. Further shown is the angle ⁇ as the angle of inclination of the air duct diagonals. The figure is supplemented by the product flow division 5 shown schematically.
  • the side walls of the dryer are inclined by an angle ⁇ and the angle ⁇ is defined by 5 ° ⁇ ⁇ 45 °, whereby the horizontal staggered arrangement can be maintained.
  • the arrangement of the air ducts is thus such that the centers of the air ducts in the horizontal duct rows are traversed by a diagonal, which corresponds to the angle ⁇ in the range of 5 ° ⁇ ⁇ 45 °.
  • a change takes place in the direction of the inclination of the side walls and a product flow division 5.
  • the particle paths run parallel to the diagonal rows of air ducts, which results in an alternating flow around hot supply air 3 or cold exhaust air ducts 4.
  • the alternating flow around Zuluft- 3 and exhaust air ducts 4 and the product flow division 5 lead to a homogenization of the drying.
  • each dryer section 2 is equipped with an odd number of horizontal rows of air ducts, as well as in the Fig. 1 is shown. This actually creates identical dryer sections 2. A possible rotation by 180 °, z. As in the assembly, no negative consequences with respect to the assignment of the air ducts and a deteriorated air flow by itself.
  • the air ducts of the roof duct dryer according to the invention in the Fig. 1 shown in the shape of an isosceles triangle.
  • the shape of the air ducts is made aerodynamic with respect to particle movement and air flow.
  • the invention achieves a constant change of the flow around the supply air and exhaust air ducts, whereby dead zones of the air flow are avoided.
  • the additional product flow divisions after each dryer section increase the uniformity of the drying and ensure a gentle product treatment.
  • the multi-level product flow split multiplies this effect. It is particularly advantageous that the product flow division is realized without additional technical effort due to the air duct arrangement according to the invention after each dryer section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP11188852.5A 2010-11-12 2011-11-11 Séchoir à colonne pour le séchage de produits en vrac Withdrawn EP2453192A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11188852.5A EP2453192A3 (fr) 2010-11-12 2011-11-11 Séchoir à colonne pour le séchage de produits en vrac

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010043873A DE102010043873A1 (de) 2010-11-12 2010-11-12 Dächerschachttrockner zur Trocknung von Schüttgut
EP11180103 2011-09-05
EP11188852.5A EP2453192A3 (fr) 2010-11-12 2011-11-11 Séchoir à colonne pour le séchage de produits en vrac

Publications (2)

Publication Number Publication Date
EP2453192A2 true EP2453192A2 (fr) 2012-05-16
EP2453192A3 EP2453192A3 (fr) 2015-12-16

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EP11188852.5A Withdrawn EP2453192A3 (fr) 2010-11-12 2011-11-11 Séchoir à colonne pour le séchage de produits en vrac

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EP (1) EP2453192A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014107280B3 (de) * 2014-05-23 2015-04-09 Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V.(ATB) Dächerschachttrockner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029570A1 (de) 2000-06-22 2002-01-03 Bsw Verfahrenstechnik Gmbh Ing Wärmetauscher für rieselfähige Feststoffe
DE10357410A1 (de) 2003-12-04 2005-07-07 Institut für Agrartechnik Bornim e.V. Verfahren und Schachttrockner zum Trocknen von rieselfähigen Schüttgütern
US7188436B2 (en) 2002-11-22 2007-03-13 Bepex International, Llc Heating and drying apparatus for particulate material
DE102007028781A1 (de) 2007-06-22 2008-12-24 Schmidt-Seeger Ag Schachttrockner mit spezieller Luft-Dachanordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002098478A (ja) * 2000-09-21 2002-04-05 Iseki & Co Ltd 穀物乾燥施設

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029570A1 (de) 2000-06-22 2002-01-03 Bsw Verfahrenstechnik Gmbh Ing Wärmetauscher für rieselfähige Feststoffe
US7188436B2 (en) 2002-11-22 2007-03-13 Bepex International, Llc Heating and drying apparatus for particulate material
DE10357410A1 (de) 2003-12-04 2005-07-07 Institut für Agrartechnik Bornim e.V. Verfahren und Schachttrockner zum Trocknen von rieselfähigen Schüttgütern
DE102007028781A1 (de) 2007-06-22 2008-12-24 Schmidt-Seeger Ag Schachttrockner mit spezieller Luft-Dachanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014107280B3 (de) * 2014-05-23 2015-04-09 Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V.(ATB) Dächerschachttrockner

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EP2453192A3 (fr) 2015-12-16

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