WO1995033169A1 - Procede de sechage - Google Patents

Procede de sechage Download PDF

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Publication number
WO1995033169A1
WO1995033169A1 PCT/AU1995/000324 AU9500324W WO9533169A1 WO 1995033169 A1 WO1995033169 A1 WO 1995033169A1 AU 9500324 W AU9500324 W AU 9500324W WO 9533169 A1 WO9533169 A1 WO 9533169A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
heat exchanger
passed
warm
product
Prior art date
Application number
PCT/AU1995/000324
Other languages
English (en)
Inventor
Patrick Constantine
Original Assignee
Pjc Airconditioning Manufacturers Pty. Ltd.
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 Pjc Airconditioning Manufacturers Pty. Ltd. filed Critical Pjc Airconditioning Manufacturers Pty. Ltd.
Priority to EP95919940A priority Critical patent/EP0711394A4/fr
Priority to BR9505498A priority patent/BR9505498A/pt
Priority to NZ285997A priority patent/NZ285997A/en
Priority to AU25583/95A priority patent/AU691924B2/en
Publication of WO1995033169A1 publication Critical patent/WO1995033169A1/fr

Links

Classifications

    • 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
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection
    • 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

Definitions

  • This invention relates to a drying process which has particular applicability to, but is not restricted to, foodstuffs.
  • Drying processes include evaporating liquids at rates varying from a few grams to many tonnes per hour from a single dryer. Drying temperatures for pharmaceutical, biological materials and foodstuffs may vary from 10° to 70° C depending on the process used. Dryers range in size from small cabinets to large towers.
  • the materials dried may be in the form of thin solutions, suspensions, slurries, pastes, granular materials, bulk objects, fibres or sheets. Drying may be accomplished by convective heat transfer, by conduction from heated surfaces, by radiation, and by dielectric heating.
  • This invention provides a drying process which has particular applicability to, but is not restricted to, foodstuffs which comprises the steps of:
  • step (3) passing the warm dry air produced by step (2) to a heat reclaim coil wherein the temperature of the air is increased and the relative humidity decreased; (4) passing the hot dry air produced by step (3) over or through a product for a sufficient time to achieve the desired drying effect;
  • step (4) venting the warm moist air produced by step (4) to the atmosphere.
  • Figure 1 is a cross-sectional view of an apparatus used to carry the invention into effect
  • Figure 2 is a diagrammatic view of a secondary heat exchanger and associated apparatus.
  • Figure 3 is a frontal diagrammatic view of a rotating wheel heat exchanger forming part of the apparatus according to the invention.
  • the ambient air used in step (1) may be warmed by heat-exchange in a secondary heat-exchanger with the warm moist air passed to step (5) .
  • the result is warm ambient air with a high relative humidity.
  • the primary heat exchanger is conveniently a rotary heat exchanger which is located adjacent a dehumidifier whereby warmed ambient air enters through one part of the primary heat exchanger rotary mechanism, in which it is cooled, passes through the dehumidifier, in which it loses moisture, and then to another part of the primary heat exchanger rotary mechanism, in which it gains heat.
  • dehumidifiers were developed to provide continuous dry air.
  • step (4) the product may be dried in bulk or in some broken-up or comminuted form.
  • the product may be sampled from time to time to check whether sufficient drying has been achieved.
  • a proportion of the warm moist air from step (4) may be passed to the primary heat exchanger to mix with incoming ambient air.
  • the process according to the invention may be used to evaporate liquids at rates varying from 2 to 5 grams to 4 tonnes per hour, for example. Greater amounts of liquid can be removed depending on the load and the size of the apparatus.
  • the drying temperature may vary from 10° to 70°C depending on the application.
  • a typical power input in a process and apparatus according to the invention is from 10 to 120 kWh.
  • incoming air is passed through the bottom of the rotary heat exchanger where its temperature is lowered sufficiently to enable it to be passed to an evaporator coil.
  • This evaporator coil further lowers the temperature of the air to allow water to be removed.
  • the resulting cold air is then returned to the top of the rotary heat exchanger where it is warmed to produce warm dry air.
  • Heat may be reclaimed from the evaporator coil and passed to a reclaim coil.
  • the warm dry air from the top of the rotary heat exchanger may be passed to the reclaim coil where it is heated to produce hot dry air which may then be used to dry the product.
  • the product may be treated with electromagnetic waves which are adapted to bring moisture to the surface of the product.
  • Suitable electromagnetic waves are those of microwave or radiofrequency. Infra-red waves may be used but are less preferred.
  • the invention is particularly effective in controlling bacterial growth. It is thought that one reason for the effectiveness of this control is the rapid change of temperature in the airflow which interferes with the metabolism of bacteria.
  • ambient air at, for example 20°C may be hated to, for example, 40°C in an external heat exchanger. It may then be cooled to, for example, 15°C in the bottom of a rotary heat exchanger and to, for example, 10°C in the evaporator coil. This cold air may then be heated to, for example, 50°C in the top of the rotary heat exchanger. The heated air may then be further heated to, for example, 70°C in a reclaim coil before being passed to the product to be dried.
  • an external heat- exchanger This heat-exchanger cools the air from, for example, 50°C to, for example, 25°C before it is vented to the atmosphere.
  • numeral 11 indicates an air-intake duct which leads downwardly to a rotary heat exchanger 12 located at one end of the structure 10.
  • Rotary heat exchanger 12 is divided into a bottom portion 12A and a top portion 12B. Warmed ambient air passes down through inlet duct 11 and is mixed with a proportion of warm moisture-laden air coming off the product Heat is extracted from the mixture in bottom portion 12A of the rotary heat exchanger and passed to upper portion 12B.
  • Cooled air passes to evaporating coil 13 where water is removed.
  • Evaporating coil 13 is located near the bottom of an ancillary chamber 14.
  • the further cooled air is reflected from the rear of ancillary chamber 14, passes above evaporating coil 13 and then through upper portion 12B of rotary heat exchanger 12.
  • the heated air is then passed upwards, directed by baffle 15, to a horizontal, upper duct 15 A located at the top of structure 10.
  • a first fan 16 is located in horizontal upper duct 15 A. Heated air is forced by first fan 16 through reclaim coil 17 and second fan 18. The now hot air is passed down through a vertical duct 18A located at an end of structure 10 distal from heat exchanger 12.
  • the hot air is passed from vertical duct 18A into an internal housing 19 in which is located an upper conveyor 20, conveying from right to left as viewed in the drawing. Part of the air-stream is forced into housing 19 by means of a bottom-mounted, third fan 18B.
  • Hot moisture-laden air is then passed to a downwardly sloping duct 22 and an upper intemal duct 23.
  • Sloping duct 22 conducts part of the warm moisture-laden air to lower portion 12A of the rotary heat exchanger 12.
  • Intemal duct 23 leads the remaining part of the warm moisture-laden air, through first filter 23A, to an exit duct 24.
  • heating equipment such as microwave apparatus may be located on the structure of internal duct 23.
  • Numeral 25 refers to a heat control bypass linked to reclaim coil 17 and located outside external structure 10. The purpose of this integer is to dump excess heat from reclaim coil 17 to the atmosphere.
  • an external heat exchanger 30 is supplied with warm moisture-laden air from exit duct 24 passing through second filter 31. The cooled air is returned to atmosphere through first exhaust fan 32. Incoming ambient air passes to heat exchanger
  • numerals 12, 12A and 12B refer to the same integers discussed above.
  • Numeral 40 refers to a barrier between lower portion 12A and upper portion 12B of the rotary heat exchanger 12.
  • Numerals 41 and 42 indicate the arrows showing the direction of flow of warm ambient air to lower portion 12A.
  • Numeral 43 indicates the direction of flow of hot air from upper portion 12B.
  • numeral 44 indicates the direction of rotation of the wheel constituting the essential operative part of the rotary heat exchanger 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Un procédé de séchage qui est surtout, mais pas uniquement, destiné au séchage de produits alimentaires consiste à: (1) chauffer l'air ambiant; (2) envoyer l'air ambiant chauffé dans un échangeur thermique primaire couplé avec une installation de déshydratation où il est refroidi, déshydraté et ensuite réchauffé; (3) envoyer l'air sec et chaud produit en (2) dans un serpentin de récupération de chaleur où la température de l'air est augmentée et l'humidité relative diminuée; (4) faire passer l'air sec produit en (3) sur ou à travers un produit pendant une durée suffisante pour obtenir l'effet de séchage recherché et (5) évacuer l'air humide chaud produit en (4) dans l'atmosphère.
PCT/AU1995/000324 1994-05-31 1995-05-31 Procede de sechage WO1995033169A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP95919940A EP0711394A4 (fr) 1994-05-31 1995-05-31 Procede de sechage
BR9505498A BR9505498A (pt) 1994-05-31 1995-05-31 Processo de secagem e aparelho para secagem
NZ285997A NZ285997A (en) 1994-05-31 1995-05-31 Drying process comprising passing hot dry air over a material to be dried
AU25583/95A AU691924B2 (en) 1994-05-31 1995-05-31 Drying process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM6017A AUPM601794A0 (en) 1994-05-31 1994-05-31 Drying process
AUPM6017 1994-05-31

Publications (1)

Publication Number Publication Date
WO1995033169A1 true WO1995033169A1 (fr) 1995-12-07

Family

ID=3780591

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1995/000324 WO1995033169A1 (fr) 1994-05-31 1995-05-31 Procede de sechage

Country Status (6)

Country Link
EP (1) EP0711394A4 (fr)
CN (1) CN1130938A (fr)
AU (1) AUPM601794A0 (fr)
BR (1) BR9505498A (fr)
NZ (1) NZ285997A (fr)
WO (1) WO1995033169A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001686A1 (fr) * 1997-05-28 2000-05-24 Australian Rural Dehydration Enterprise Pty. Ltd. Installation de deshydratation
WO2007062180A1 (fr) * 2005-11-23 2007-05-31 The Sherwin-Williams Company Systeme et procede de commande de l'energie appliquee a un materiau
WO2009070627A1 (fr) * 2007-11-30 2009-06-04 Certainteed Gypsum, Inc. Procédé d'utilisation d'énergie thermique à partir de sources de gazéification dans la fabrication de plaques de plâtre
CN103822455A (zh) * 2014-02-21 2014-05-28 泰山石膏股份有限公司 一种石膏板干燥排汽填料塔热回收系统
US10473397B2 (en) 2008-11-25 2019-11-12 Certainteed Gypsum, Inc. Method for the use of heat energy from gasification sources in gypsum board production

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107036398A (zh) * 2017-06-09 2017-08-11 重庆光全节能科技有限公司 一种无能源除湿加热烘烤系统

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2319863A1 (fr) * 1975-07-31 1977-02-25 Buehler Ag Geb Procede de manipulation de produit en vrac pendant un traitement, application de ce procede et dispositif pour sa mise en oeuvre
US4043051A (en) * 1975-02-24 1977-08-23 Delbert Lussenden Method and apparatus for drying grain
BE859847A (nl) * 1976-10-18 1978-02-15 Baltes Hans Werkwijze voor het drogen van wasgoed en droogkast voor toepassing van deze werkwijze
US4145820A (en) * 1977-08-10 1979-03-27 Npi Corporation Moisture remover for produce
WO1984001020A1 (fr) * 1982-08-30 1984-03-15 Sun Flo Int Inc Deshydrateur mobile de produits alimentaires assiste par l'energie solaire
EP0145822A1 (fr) * 1983-12-19 1985-06-26 COMPAGNIE FRANCAISE DES MICRO-RAYONNEMENTS, Société Anonyme française: Procédé et installation pour le séchage de produits humides, en particulier de mélanges à base d'argile
US4532720A (en) * 1982-11-02 1985-08-06 Shonetsugaku Kenkyusho Co., Ltd. Drying process and its apparatus utilizing a refrigeration cycle
WO1986002149A1 (fr) * 1984-10-05 1986-04-10 Michael Goldberg Sechage en circuit ferme par une pompe a chaleur
US4974337A (en) * 1989-10-30 1990-12-04 The Conair Group, Inc. Apparatus and method of drying and dehumidifying plastic
GB2259977A (en) * 1991-09-27 1993-03-31 Ind Tech Res Inst Drying apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2902369A1 (de) * 1979-01-22 1980-08-07 Happel Kg Einrichtung zum entfeuchten und temperieren der in einer trocknungskammer fuer die holztrocknung bewegten kammerluft
DE2929707C2 (de) * 1979-07-21 1984-08-09 Kraftanlagen Ag, 6900 Heidelberg Verfahren und Vorrichtung zur Heißlufttrocknung, insbesondere Darrbehandlung von Grünmalz
US4324052A (en) * 1980-09-05 1982-04-13 Bosher John L Solvent and heat recovery system for drying oven

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043051A (en) * 1975-02-24 1977-08-23 Delbert Lussenden Method and apparatus for drying grain
FR2319863A1 (fr) * 1975-07-31 1977-02-25 Buehler Ag Geb Procede de manipulation de produit en vrac pendant un traitement, application de ce procede et dispositif pour sa mise en oeuvre
BE859847A (nl) * 1976-10-18 1978-02-15 Baltes Hans Werkwijze voor het drogen van wasgoed en droogkast voor toepassing van deze werkwijze
US4145820A (en) * 1977-08-10 1979-03-27 Npi Corporation Moisture remover for produce
WO1984001020A1 (fr) * 1982-08-30 1984-03-15 Sun Flo Int Inc Deshydrateur mobile de produits alimentaires assiste par l'energie solaire
US4532720A (en) * 1982-11-02 1985-08-06 Shonetsugaku Kenkyusho Co., Ltd. Drying process and its apparatus utilizing a refrigeration cycle
EP0145822A1 (fr) * 1983-12-19 1985-06-26 COMPAGNIE FRANCAISE DES MICRO-RAYONNEMENTS, Société Anonyme française: Procédé et installation pour le séchage de produits humides, en particulier de mélanges à base d'argile
WO1986002149A1 (fr) * 1984-10-05 1986-04-10 Michael Goldberg Sechage en circuit ferme par une pompe a chaleur
US4974337A (en) * 1989-10-30 1990-12-04 The Conair Group, Inc. Apparatus and method of drying and dehumidifying plastic
GB2259977A (en) * 1991-09-27 1993-03-31 Ind Tech Res Inst Drying apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0711394A4 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001686A1 (fr) * 1997-05-28 2000-05-24 Australian Rural Dehydration Enterprise Pty. Ltd. Installation de deshydratation
EP1001686A4 (fr) * 1997-05-28 2000-09-20 Australian Rural Dehydration E Installation de deshydratation
US6233841B1 (en) 1997-05-28 2001-05-22 Australian Rural Dehydration Enterprise Pty. Ltd. Dehydration plant
WO2007062180A1 (fr) * 2005-11-23 2007-05-31 The Sherwin-Williams Company Systeme et procede de commande de l'energie appliquee a un materiau
WO2009070627A1 (fr) * 2007-11-30 2009-06-04 Certainteed Gypsum, Inc. Procédé d'utilisation d'énergie thermique à partir de sources de gazéification dans la fabrication de plaques de plâtre
US8371038B2 (en) 2007-11-30 2013-02-12 Certainteed Gypsum, Inc. Method for the use of heat energy from gasification sources in gypsum board production
US10473397B2 (en) 2008-11-25 2019-11-12 Certainteed Gypsum, Inc. Method for the use of heat energy from gasification sources in gypsum board production
CN103822455A (zh) * 2014-02-21 2014-05-28 泰山石膏股份有限公司 一种石膏板干燥排汽填料塔热回收系统

Also Published As

Publication number Publication date
AUPM601794A0 (en) 1994-06-23
CN1130938A (zh) 1996-09-11
EP0711394A1 (fr) 1996-05-15
NZ285997A (en) 1998-04-27
BR9505498A (pt) 1996-04-23
EP0711394A4 (fr) 1998-04-01

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