WO1996026403A1 - Procede et dispositif de deshydratation de produits hydrates - Google Patents

Procede et dispositif de deshydratation de produits hydrates Download PDF

Info

Publication number
WO1996026403A1
WO1996026403A1 PCT/NL1996/000085 NL9600085W WO9626403A1 WO 1996026403 A1 WO1996026403 A1 WO 1996026403A1 NL 9600085 W NL9600085 W NL 9600085W WO 9626403 A1 WO9626403 A1 WO 9626403A1
Authority
WO
WIPO (PCT)
Prior art keywords
products
air stream
demoisturizing
moisture
belt conveyer
Prior art date
Application number
PCT/NL1996/000085
Other languages
English (en)
Inventor
Stephanus Michael Marie Backus
Original Assignee
Backus Beheer B.V.
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 Backus Beheer B.V. filed Critical Backus Beheer B.V.
Priority to DE69612612T priority Critical patent/DE69612612T2/de
Priority to EP96904365A priority patent/EP0811141B1/fr
Publication of WO1996026403A1 publication Critical patent/WO1996026403A1/fr
Priority to US08/918,606 priority patent/US5913590A/en

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
    • 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
    • F26B17/026—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 material being moved in-between belts which may be perforated
    • 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
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/106—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure, e.g. its axis, being substantially straight and horizontal, e.g. pneumatic drum dryers; the drying enclosure consisting of multiple substantially straight and horizontal stretches
    • 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
    • F26B17/24—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by shooting or throwing the materials, e.g. after which the materials are subject to impact

Definitions

  • the invention relates to a method for demoisturizing moist products by imparting an irregular movement to the products and collecting and discharging the moisture that is released by the irregular movement of the products.
  • Such a method is known, and is especially used in the mechanical processing of products which may not be subjected to high temperatures during demoisturizing or "dewatering" thereof, like vegetables, fruits etc.
  • the known method of demoisturizing by shaking or vibrating takes a relatively large amount of time, thus decreasing the efficiency of the mechanical processing, and requiring relatively large processing installations for achieving a sufficient throughput.
  • the shaking or vibrating which usually takes place mechanically, may easily lead to damaging the generally vulnerable lettuce products.
  • the invention therefore has for its object to provide a method of the type described above, with which these drawbacks are obviated.
  • this is accomplished in that the irregular movement is imparted to the products by subjecting them to an air stream which varies over time. Shaking or vibrating the products by means of an air stream leads to efficient and swift demoisturizing thereof, without the risk of damage to the products .
  • the invention also relates to an apparatus for demoisturizing moist products, comprising means for imparting an irregular movement to the products, means for collecting moisture released by the products and means for discharging the collected moisture.
  • Such an apparatus is also known and is generally used in mechanical washing and demoisturizing lines for e.g. vegetables or fruit.
  • the known apparatus usually comprises a vibrating or shaking sieve for irregularly moving the products to be demoisturizing or dried, on which the products are advanced through the apparatus, while at the same time the adhering moisture is shaken or vibrated off.
  • the transport capacity of such vibrating or shaking sieves is, however, relatively low, whereas furthermore the danger of damage to the products is considerable.
  • the invention therefore also has for its object to provide an improved apparatus of this type, which apparatus is characterized according to the invention in that the means for irregularly moving the products comprise means for generating an air stream that varies over time and for guiding the air stream along the products.
  • fig. 1 is a partially broken away perspective view of the demoisturizing apparatus according to the invention
  • fig. 2 is a partially broken away perspective detail view along the arrow II in fig. 1.
  • An apparatus 1 for demoisturizing or "dewatering" moist products 2 (fig. 1) comprises means for irregularly moving the products 2, means for collecting moisture released by the products, and means for discharging the collected moisture (not shown) .
  • the means for irregularly moving the products 2 comprise means for generating an air stream A that varies over time and for guiding this air stream along the products 2, as well as means 16 for transporting the products 2 along the air stream generating means in accordance with the arrow T, substantially perpendicular to the air stream A.
  • the means for generating an air stream A and for guiding it along the products 2 comprise a plurality of pressure fans or compressors 3, each of which is connected with its pressure side to a lower part 5 of an inner housing 4.
  • the lower part 5 comprises sloped walls 13 defining a diffuser part 10, which is further bordered by vertical walls 6 and a top wall 7 (fig. 2) .
  • the top wall 7 of the lower casing 5 comprises crenelles 8, which are open at the top and thus form discharge openings 9. These discharge openings 9 extend over substantially the entire width of the transport means 16.
  • the discharge openings 9 are spaced in the direction of transport T, whereby the products 2 which are supplied by the transport means 16 will be led through an air stream A several times during transport through the apparatus 1.
  • the products 2 are in fact subjected to an air stream A which varies over time, viz. the full force of the air stream A at the discharge openings 9, followed by a "calm" part of the transport means 16.
  • the transport means 16 incidentally comprise an air permeable belt conveyer 17 which is moveable along the discharge openings 9.
  • This belt conveyer 17 is guided over guide rolls 18-23, and driven by a motor 24.
  • the products 2 are thus subjected to an air stream which varies during transport through the apparatus 1, they will move through the apparatus 1 along a bouncing trajectory, being lifted from the belt conveyer 17 by each air stream A, and subsequently falling back at the following "calm" portion.
  • the demoisturizing apparatus 2 further comprises means 27 spaced from the discharge openings 9 in the direction of the air stream A for blocking the upward movement of the products 2.
  • These blocking means 27 comprise a moisture absorbing, air permeable belt conveyer 28 guided along guide rolls 29-32, which may be moved with the lower belt conveyer 17 in the direction of the arrow M, and is driven by a motor 43.
  • this conveyer 28 blocks the upward movement of the products 2 in the air stream A, the moisture is beaten from the products 2, and subsequently absorbed in the moisture absorbing conveyer 28
  • Suction openings 33 are arranged behind the moisture absorbing conveyer 28 when seen in the direction of the air stream A, these openings in turn being connected to the means for generating the air stream A.
  • the number of suction openings 33 substantially corresponds with the number of discharge openings 9.
  • the suction openings 33 and the discharge openings 9 incidentally are not arranged opposite each other, but are staggered in the direction of transport T.
  • the air velocity at the suction openings 33 need not be equal to the discharge velocity of the air over the openings 9.
  • the discharge velocity may for instance be selected twice as high as the suction velocity, by selectin a total area of the discharge openings 9 which is approximately half the total area of the suction openings.
  • demoisturizing apparatus 1 which has proven to be useful in practice may have a discharge velocity in the order of 10 t 70 m/s, preferably 40 m/s, while the suction velocity is 5 to 35 m/s, preferably 20 m/s.
  • the lower casing 5 Between the crenelles 8 the lower casing 5 comprises separation walls 37, which are placed somewhat inwardly of the sidewalls 6 of the lower casing 5, and whic divide the space between the crenelles 8 in receptor bins 3 located at the inside, and bypass ducts 14 having discharge openings 36 for cleaning bypass air BL at the outside.
  • This bypass air BL which is led from the lower casing 5 through openings 38 to the bypass duct 14, and is finally blown out through the openings 36 along the edge of the conveyer 17, serves to prevent the product from assembling along the edg of the conveyer 17 and thus being caught and smeared betwee the conveyer 17 and the fixed parts of the apparatus 1.
  • the demoisturizing apparatus 1 will usually be installed at the end of a cleaning line for the products 2, so that products leaving the apparatus 1 will generally not be cleaned any further.
  • the receptor bins 35 between the walls 37 also serve to receive products which may fall through the belt conveyer 17, and to prevent these parts of the products from being smeared between the belt conveyer 17 and the fixed parts of the apparatus 1. Furthermore, the bins 35 as a matter of course receive part of the moisture released by the products 2.
  • the belt conveyer may be led through a cleaning installation 25 in its return path, in which for instance a cleaning fluid is sprayed onto the belt by means of spray tubes 26. Cleaning by means of for instance air or UV radiation is also a possibility. It will further be clear that the upper belt conveyer 28 may be subjected to a similar cleaning operation.
  • the suction openings 33 are constructed in a similar manner as the discharge openings 9, and are also arranged in crenelles 34, which form part of the bottom wall of an upper part 41 of the inner housing 4.
  • the spaces between the crenelles 34 serve as receptor areas 40, while the walls 39 arranged between the crenelles 34 serve as guidance for the upper belt conveyer 28.
  • the suction openings do not extend over the full width of the upper conveyer 28.
  • the moist air drawn off by the suction openings 33 is collected in the upper part 41 of the housing and is led back from there through an opening 42 as return air to the fans or compressors 3, thus forming a closed loop system.
  • the moisture present in the return air condenses against the inside of the outer housing 44. It is of course also possible to construct the apparatus 1 as an open loop system, in which the air that is drawn off is dried and discharged, and the compressors 3 continuously suck in fresh air.
  • an opening 11 is arranged at both sides between the lower part 5 and the upper part 41, which opening is closed off during operation of the apparatus 1 by a door 12, for instance an upwardly and downwardly moveable sliding door.
  • a door 12 for instance an upwardly and downwardly moveable sliding door.
  • the inner housing 4 constituted by the lower part 5 and the upper part 41 is completely surrounded by an outer housing 44, which is formed by side walls 45, a bottom 54, a top 46 and front and rear walls 47, 48. Openings 49 are arranged in the front and rear walls 47, 48 for letting through the transport means 16 and moveable blocking means 27.
  • the outer housing 44 the moisture from the return air R, which mostly condenses against the walls of the housing, is collected and eventually discharged.
  • the apparatus 1 may further comprise mechanical means 50 for irregularly moving the belt conveyer 17 and the products 2 lying thereon.
  • These mechanical moving means 50 comprise a shaft 51, carrying two parallel, eccentric knocking members 52, which will lift the belt conveyer 17 somewhat during rotation of the shaft 51, after which the conveyer will regain its original shape as a result of the tension therein.
  • a considerable vibrating or shaking movement is imparted to the products.
  • the belt 17 is relatively light weight when compared to for instance a vibrating or shaking sieve, it can be subjected to fairly considerable accelerations perpendicularly to its plane; thus allowing an effective first separation of the moisture and products .
  • the moisture released during this first separation is directly collected in the outer housing 44.
  • the speed of each of these parts may be independently selected.
  • the blowing and suction force of the compressors 3 may also be separately selected.
  • the amount of moisture separation by the knocking mechanism 50 may further be affected by the dimensions of the knocking members 52.
  • an elliptical or otherwise eccentrical shaft 50 may of course also be employed.
  • the demoisturizing apparatus of the invention may for instance be incorporated in a mechanical washing and demoisturizing line for e.g. lettuce products, in which the lettuce products are first cut, and subsequently go through a number of baths, in which they are washed, with the products being dried and disinfected in between, after which subsequent demoisturizing may take place in the demoisturizing apparatus of the invention, in which for instance the moisture content is reduced from approximately 30 % to approximately 10 %, after which the products are finally dried to a moisture content of for instance approximately 2 % in a tunnel drier as described in applicant's earlier European patent application bearing publication number EP-A-0 567 197.
  • a mechanical washing and demoisturizing line for e.g. lettuce products, in which the lettuce products are first cut, and subsequently go through a number of baths, in which they are washed, with the products being dried and disinfected in between, after which subsequent demoisturizing may take place in the demoisturizing apparatus of the invention, in which for instance the

Landscapes

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

Abstract

La présente invention concerne un procédé de desséchage de produits hydratés consistant à soumettre les produits à un mouvement irrégulier et à récupérer l'humidité se dégageant sous l'effet du mouvement irrégulier des produits. On obtient un mouvement irrégulier des produits en les soumettant à un courant d'air variant dans le temps. Ce procédé permet de dessécher efficacement et rapidement les produits sans risquer de les endommager. L'invention concerne également un dispositif (1) permettant la mise en ÷uvre du procédé, et comprenant un organe qui soumet les produits (2) à un mouvement irrégulier, un organe (44) qui récupère l'humidité se dégageant sous l'effet du mouvement irrégulier des produits. En l'occurrence, l'organe soumettant les produits à un mouvement irrégulier comprend un moyen (3) destiné à produire un flux d'air (17) variant dans le temps et à guider le flux d'air le long des produits.
PCT/NL1996/000085 1995-02-23 1996-02-22 Procede et dispositif de deshydratation de produits hydrates WO1996026403A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69612612T DE69612612T2 (de) 1995-02-23 1996-02-22 Verfahren und vorrichtung zur entfeuchtung von nassen waren
EP96904365A EP0811141B1 (fr) 1995-02-23 1996-02-22 Procede et dispositif de deshydratation de produits hydrates
US08/918,606 US5913590A (en) 1996-02-22 1997-08-22 Method and apparatus for demoisturizing moist products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9500360A NL9500360A (nl) 1995-02-23 1995-02-23 Werkwijze en inrichting voor het ontvochtigen van vochtige produkten.
NL9500360 1995-02-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/918,606 Continuation-In-Part US5913590A (en) 1996-02-22 1997-08-22 Method and apparatus for demoisturizing moist products

Publications (1)

Publication Number Publication Date
WO1996026403A1 true WO1996026403A1 (fr) 1996-08-29

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ID=19865634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1996/000085 WO1996026403A1 (fr) 1995-02-23 1996-02-22 Procede et dispositif de deshydratation de produits hydrates

Country Status (4)

Country Link
EP (1) EP0811141B1 (fr)
DE (1) DE69612612T2 (fr)
NL (1) NL9500360A (fr)
WO (1) WO1996026403A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1164344A1 (fr) * 2000-06-14 2001-12-19 Turatti s.r.l. Dispositif pour le séchage en continu de légumes, notamment de légumes à feuilles
WO2002093097A1 (fr) 2001-05-17 2002-11-21 Backus Beheer B.V. Appareil pour deshydrater des produits relativement vulnerables
WO2016179687A1 (fr) * 2015-05-12 2016-11-17 Cmp Systems, Inc. Système de retrait de fluide
US10948232B2 (en) 2016-11-29 2021-03-16 Autefa Solutions Germany Gmbh Textile fiber drying
CN114893953A (zh) * 2022-05-09 2022-08-12 高迎彩 一种煤粉制备用防止结块的烘干处理装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005048661B4 (de) * 2004-10-13 2017-06-29 Maag Automatik Gmbh Verfahren zum kontinuierlichen Trocknen von Wasser umspültem Granulat
RU171816U1 (ru) * 2016-07-04 2017-06-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Ивановский государственный химико-технологический университет" (ИГХТУ) Ленточная сушилка для пастообразных материалов

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1681556A (en) * 1927-05-09 1928-08-21 Parker Donald Washing and drying apparatus
DE473130C (de) * 1929-03-09 Hermann Haas Trockenvorrichtung mit endlos umlaufenden Foerderbaendern
FR877981A (fr) * 1940-12-30 1943-01-07 Brown Dispositif pour charger et évacuer les produits en vrac dans un séchoir
US2338619A (en) * 1940-07-05 1944-01-04 Proctor & Schwartz Inc Method and apparatus for treating fibrous material
CH238094A (de) * 1943-09-08 1945-06-30 W & O Gericke Bandtrockner.
CH314415A (de) * 1953-05-19 1956-06-15 Buss Ag Bandtrockner
FR1321839A (fr) * 1962-05-08 1963-03-22 Haas Friedrich Maschf Installation de traitement de matière fibreuse lâche
GB1013632A (en) * 1963-08-09 1965-12-15 Friedrich Haas Gmbh Maschf Belt dryer
US3307270A (en) * 1965-10-21 1967-03-07 Lamb Weston Inc Drying apparatus and method
US3618226A (en) * 1969-10-24 1971-11-09 Haas Friedrich Maschf Apparatus for continuously drying web material especially textile material
FR2439959A1 (fr) * 1978-10-27 1980-05-23 Sperotto Spa Machine pour le sechage de tissus, en particulier de tissus a mailles du type jersey
GB2053433A (en) * 1979-06-14 1981-02-04 Sando Iron Works Co Method and apparatus for continuously drying a cloth
EP0058398A2 (fr) * 1981-02-16 1982-08-25 AUTOMATIK Apparate-Maschinenbau GmbH Dispositif pour déshydrater et sécher des solides, notamment des matières synthétiques granulées sous l'eau
EP0358136A2 (fr) * 1988-09-03 1990-03-14 Austria Haustechnik Gesellschaft M.B.H. Procédé et dispositif de traitement des bandes continues textiles
WO1991015129A1 (fr) * 1990-03-30 1991-10-17 Gbe International Plc Appareil et procede de conditionnement de matiere particulaire

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE473130C (de) * 1929-03-09 Hermann Haas Trockenvorrichtung mit endlos umlaufenden Foerderbaendern
US1681556A (en) * 1927-05-09 1928-08-21 Parker Donald Washing and drying apparatus
US2338619A (en) * 1940-07-05 1944-01-04 Proctor & Schwartz Inc Method and apparatus for treating fibrous material
FR877981A (fr) * 1940-12-30 1943-01-07 Brown Dispositif pour charger et évacuer les produits en vrac dans un séchoir
CH238094A (de) * 1943-09-08 1945-06-30 W & O Gericke Bandtrockner.
CH314415A (de) * 1953-05-19 1956-06-15 Buss Ag Bandtrockner
FR1321839A (fr) * 1962-05-08 1963-03-22 Haas Friedrich Maschf Installation de traitement de matière fibreuse lâche
GB1013632A (en) * 1963-08-09 1965-12-15 Friedrich Haas Gmbh Maschf Belt dryer
US3307270A (en) * 1965-10-21 1967-03-07 Lamb Weston Inc Drying apparatus and method
US3618226A (en) * 1969-10-24 1971-11-09 Haas Friedrich Maschf Apparatus for continuously drying web material especially textile material
FR2439959A1 (fr) * 1978-10-27 1980-05-23 Sperotto Spa Machine pour le sechage de tissus, en particulier de tissus a mailles du type jersey
GB2053433A (en) * 1979-06-14 1981-02-04 Sando Iron Works Co Method and apparatus for continuously drying a cloth
EP0058398A2 (fr) * 1981-02-16 1982-08-25 AUTOMATIK Apparate-Maschinenbau GmbH Dispositif pour déshydrater et sécher des solides, notamment des matières synthétiques granulées sous l'eau
EP0358136A2 (fr) * 1988-09-03 1990-03-14 Austria Haustechnik Gesellschaft M.B.H. Procédé et dispositif de traitement des bandes continues textiles
WO1991015129A1 (fr) * 1990-03-30 1991-10-17 Gbe International Plc Appareil et procede de conditionnement de matiere particulaire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1164344A1 (fr) * 2000-06-14 2001-12-19 Turatti s.r.l. Dispositif pour le séchage en continu de légumes, notamment de légumes à feuilles
US6481117B2 (en) 2000-06-14 2002-11-19 Turatti Srl Apparatus for continuously drying vegetables, particularly leaf vegetables
WO2002093097A1 (fr) 2001-05-17 2002-11-21 Backus Beheer B.V. Appareil pour deshydrater des produits relativement vulnerables
WO2016179687A1 (fr) * 2015-05-12 2016-11-17 Cmp Systems, Inc. Système de retrait de fluide
US10948232B2 (en) 2016-11-29 2021-03-16 Autefa Solutions Germany Gmbh Textile fiber drying
CN114893953A (zh) * 2022-05-09 2022-08-12 高迎彩 一种煤粉制备用防止结块的烘干处理装置
CN114893953B (zh) * 2022-05-09 2024-05-03 山东新成供应链管理有限公司 一种煤粉制备用防止结块的烘干处理装置

Also Published As

Publication number Publication date
EP0811141B1 (fr) 2001-04-25
DE69612612T2 (de) 2001-10-11
NL9500360A (nl) 1996-10-01
EP0811141A1 (fr) 1997-12-10
DE69612612D1 (de) 2001-05-31

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