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WO1997019306A1 - Procede de sechage a l'interieur d'une enceinte constituee d'une couche mince - Google Patents

Procede de sechage a l'interieur d'une enceinte constituee d'une couche mince Download PDF

Info

Publication number
WO1997019306A1
WO1997019306A1 PCT/SE1996/001502 SE9601502W WO9719306A1 WO 1997019306 A1 WO1997019306 A1 WO 1997019306A1 SE 9601502 W SE9601502 W SE 9601502W WO 9719306 A1 WO9719306 A1 WO 9719306A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
goods
enclosure
drying
contact
Prior art date
Application number
PCT/SE1996/001502
Other languages
English (en)
Inventor
Sten Olof Zeilon
Original Assignee
Sten Olof Zeilon
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 Sten Olof Zeilon filed Critical Sten Olof Zeilon
Priority to AU77148/96A priority Critical patent/AU7714896A/en
Priority to PL96326943A priority patent/PL326943A1/xx
Priority to EP96940204A priority patent/EP0866939A1/fr
Priority to BR9611742A priority patent/BR9611742A/pt
Publication of WO1997019306A1 publication Critical patent/WO1997019306A1/fr
Priority to NO982319A priority patent/NO982319L/no

Links

Classifications

    • 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
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F26B21/028—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow by air valves, movable baffles or nozzle arrangements
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/006—Removable covering devices, e.g. pliable or flexible

Definitions

  • a method of drying within a film enclosure is a method of drying within a film enclosure.
  • the present invention relates to a method of drying a gas penetrable drying goods, essentially vapour tight enclosed by a load bearing platform and a thin film enclosure and compri ⁇ sing a flow of a gas/vapour mixture circulated in sequence through a fan/heater aggregate, to contact to said goods, to a cooling contact to inside portions of said film enclosure and back to said fan/heater aggregate.
  • the invention relates to drying gas penetrable lots of lumber, grain material or other loosely packed or hanged material.
  • the invention may also be used for evaporation of fluids dispersed on contact surfaces.
  • the invention is an essential improvement on a drying technique, known from my Swedish patent 500368, where a drying goods is essentially vapour tight enclosed in a film cover.An enclosed gas/vapour mixture is circulated in contact to a heater , to the drying goods and to the inside of the cover. Vapour is con ⁇ densed against the cover, in its turn cooled to the outside.
  • the purpose of the present invention is to essentially improve the drying process, especially for drying to low moisture content.
  • This purpose is achieved by a method characterized in that it comprises a first part flow of said flow being returned after said contact to the goods directly via return channels with neglible cooling effect to said lan/heater aggregate and a second part flow driven from said contact to the goods to said cooling contact to the film enclosure and back to the fan/heater aggregate , here the two part flows are blended.
  • FIG. 4 shows in section exterior cooling of the dryer.
  • Figures 5 and 6 show in plan alternate arrangements of gas circulation.
  • a fan/heater aggregate 3 and channel forming ele ⁇ ments Inside the enclosure is enclosed a fan/heater aggregate 3 and channel forming ele ⁇ ments and the enclosure is filled by a gas/vapour mixture, preferably with a small overpressure in relation to the sur ⁇ roundings.
  • a flow 2 is driven in sequence through the fan/heater aggregate, to contact to the drying goods, to cooling contact to inside portions of the film enclosure but with an essential differance in that a first part flow 21 is returned after contact to the drying goods directly via return channels 6 with neglible cooling effect to the fan/heater aggregate and in that a second part flow 22 after contact to the goods is driven to a cooling contact to the film enclosure and back to the fan/heater aggre ⁇ gate, where the part flows are blended.
  • the second part flow 22 is guided to skim cooling portions of the film enclo ⁇ sure from one end 51 to an opposite end 52, giving as long a pathway for the flow as is possible within the given enclosure.
  • an improved exterior cooling of the part flow 22 may be arranged by propulsion of an air flow 9 driven in counterflow fashion in a channel formed by mentioned portions of the film enclosure and an exterior confinement 92.
  • the proportions in mass flows of the two part flows 21,22 may be regulated with regulating means 31, as illustrated by dam ⁇ pers positioned near suction openings 31,32 of the fan/heater aggregate.
  • the reduced film temperatures will reduce heat transfer to the surroundings as a token on an improved drying process .
  • the proportions in mass flow of the two part flows 21,22 are regulated concurrently with lowered moisture content such, that the first part flow 21 is increased and the second part flow 22 is decreased and consequently will have an increased temperature drop.
  • two lots 11 form an inlet channel 7 for the flow 2, while two heat insulated channels 6 on the outside will guide the first part flow 21 to the fan /heater and the second part flow to mentioned end 51 of the enclosure 5.
  • two lots 11 form a return channel 6 for the first part flow 21 and an outlet for the second part flow 22 towards mentioned end 51 of the enclosure 5.
  • Heat insulated inlet channels 7 for the flow 2 are connected to inlet openings in the goods along the outside of the lots.
  • SUBSTITUTE SHEET In referance to figure 6 four lots 11 form in intermediate spaces two inlet channels 7 for the flow 2 and one return channel 6 for the first part flow 21. Heat insulated spaces along the outsides of the outer lots serve as return channels for the first part flow 21 and as outlets towards one end 51 for the second part flow 22.
  • the film cover is in form of a plastic film tube knit together at the top under drying and assembled around a bottom platform under reloading the dryer.
  • This procedure is for larger dryers, for instance for lumber lots, unpractible.
  • the flexible film enclosure is hoisted to a height, that allows free handling of the lots 11.
  • the bottom edge of the film enclosure is fixed to a frame 53, which under dry ⁇ ing penetrates into a waterfilled trough 41 in the platform 4, acting as a vapour lock and condensate receiver.
  • the frame Under reloading the frame is hoisted to a position marked 53' in referance to figure 4. o ensure a smooth folding of the film, it may slide on tube formed guides 42, anchored to the plat ⁇ form.
  • the film enclosure applies, that it should be essentially vapourtight, have a low heat resistance and have a good re ⁇ sistance to a drying climate, that is hot, very humid and often corrosive.
  • a thin, weldable plastic film with a high diffusion resistance to water vapour may be pre ⁇ ferred, such as polyetylene or ethylvinylacetate . Even if plastics deteriorate by time from heat/humidity exposure an exchange of the film enclosure may easily be made at neglible cost .
  • An exterior shelter may shield the film enclosure 5 from ex ⁇ posure to wind,snow, rain and sun and also serve as framing for mentioned insulators 8 and as confinement for a mentioned cooling flow 9.
  • This flow absorbing the heat flux from the dryer, may be directed to heat reuse, for instance for local heating or for predrying wet drying goods.
  • the film enclosure may be fixed to an exterior or interior framework and be supplied with seal equipped doors for loading/unloading of the goods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Ce procédé de séchage à l'intérieur d'une enceinte fermée (5) comprend un flux (2) constitué d'un mélange de gaz/vapeur circulant dans un ensemble ventilateur/chauffage (3), de façon à entrer en contact avec des marchandises mises à sécher (1). De là, une première partie du flux (21) est ramenée, via des canaux (6) et avec un effet réfrigérant négligeable, jusqu'à l'ensemble ventilateur/chauffage, tandis qu'une seconde partie du flux (22) est amenée en contact réfrigérant avec l'intérieur de l'enveloppe (5), puis ramenée à l'ensemble ventilateur-chauffage, où les deux flux partiels (21, 22) fusionnent.
PCT/SE1996/001502 1995-11-22 1996-11-20 Procede de sechage a l'interieur d'une enceinte constituee d'une couche mince WO1997019306A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU77148/96A AU7714896A (en) 1995-11-22 1996-11-20 A method of drying within a film enclosure
PL96326943A PL326943A1 (en) 1995-11-22 1996-11-20 Method of drying inside a plastic foil enclosure
EP96940204A EP0866939A1 (fr) 1995-11-22 1996-11-20 Procede de sechage a l'interieur d'une enceinte constituee d'une couche mince
BR9611742A BR9611742A (pt) 1995-11-22 1996-11-20 Processo de secagem de gênros a serem secos penetráveis por gás
NO982319A NO982319L (no) 1995-11-22 1998-05-20 FremgangsmÕte for Õ t°rke inne i en filminnelukning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504183-6 1995-11-22
SE9504183A SE9504183L (sv) 1995-11-22 1995-11-22 Sätt för torkning inom ett hölje av foliematerial

Publications (1)

Publication Number Publication Date
WO1997019306A1 true WO1997019306A1 (fr) 1997-05-29

Family

ID=20400329

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001502 WO1997019306A1 (fr) 1995-11-22 1996-11-20 Procede de sechage a l'interieur d'une enceinte constituee d'une couche mince

Country Status (8)

Country Link
EP (1) EP0866939A1 (fr)
AU (1) AU7714896A (fr)
BR (1) BR9611742A (fr)
CA (1) CA2238049A1 (fr)
NO (1) NO982319L (fr)
PL (1) PL326943A1 (fr)
SE (1) SE9504183L (fr)
WO (1) WO1997019306A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999004209A1 (fr) * 1997-07-18 1999-01-28 Dtl S.A. Systeme de production modulaire portable incluant un tunnel de sechage
WO2002023108A1 (fr) * 2000-09-14 2002-03-21 Bühler AG Sechoir a double gaine
CN113048730A (zh) * 2021-03-12 2021-06-29 中国中轻国际工程有限公司 一种麦芽干燥炉的风门组合系统及其干燥工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500385C2 (sv) * 1993-05-31 1994-06-13 Sten Zeilon Virkestork
SE500368C2 (sv) * 1992-07-28 1994-06-13 Sten Zeilon Torkningsanordning

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500368C2 (sv) * 1992-07-28 1994-06-13 Sten Zeilon Torkningsanordning
SE500385C2 (sv) * 1993-05-31 1994-06-13 Sten Zeilon Virkestork

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999004209A1 (fr) * 1997-07-18 1999-01-28 Dtl S.A. Systeme de production modulaire portable incluant un tunnel de sechage
WO2002023108A1 (fr) * 2000-09-14 2002-03-21 Bühler AG Sechoir a double gaine
CN113048730A (zh) * 2021-03-12 2021-06-29 中国中轻国际工程有限公司 一种麦芽干燥炉的风门组合系统及其干燥工艺
CN113048730B (zh) * 2021-03-12 2024-05-28 中国中轻国际工程有限公司 一种麦芽干燥炉的风门组合系统及其干燥工艺

Also Published As

Publication number Publication date
EP0866939A1 (fr) 1998-09-30
NO982319D0 (no) 1998-05-20
BR9611742A (pt) 1999-02-23
PL326943A1 (en) 1998-11-09
SE9504183D0 (sv) 1995-11-22
AU7714896A (en) 1997-06-11
CA2238049A1 (fr) 1997-05-29
SE504594C2 (sv) 1997-03-10
NO982319L (no) 1998-07-14
SE9504183L (sv) 1997-03-10

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