WO2000001256A1 - Sechoir a flux basse temperature et procede - Google Patents

Sechoir a flux basse temperature et procede Download PDF

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Publication number
WO2000001256A1
WO2000001256A1 PCT/AU1999/000530 AU9900530W WO0001256A1 WO 2000001256 A1 WO2000001256 A1 WO 2000001256A1 AU 9900530 W AU9900530 W AU 9900530W WO 0001256 A1 WO0001256 A1 WO 0001256A1
Authority
WO
WIPO (PCT)
Prior art keywords
aerosolizer
plant material
air
chamber
air stream
Prior art date
Application number
PCT/AU1999/000530
Other languages
English (en)
Inventor
Jose Luis Ruiz-Avila
Original Assignee
Akt Consultants 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 Akt Consultants Pty. Ltd. filed Critical Akt Consultants Pty. Ltd.
Priority to AU45921/99A priority Critical patent/AU4592199A/en
Publication of WO2000001256A1 publication Critical patent/WO2000001256A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/02—Dehydrating; Subsequent reconstitution
    • A23B7/0205—Dehydrating; Subsequent reconstitution by contact of the material with fluids, e.g. drying gas or extracting liquids
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
    • A23N12/00—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts
    • A23N12/08—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts for drying or roasting

Definitions

  • THIS INVENTION relates to a process and apparatus for drying and in particular but not limited to a process and apparatus for drying plant material such as grasses and leaves including tea.
  • the present invention resides in a process for the removal of moisture and oils from plant material by physical agitation in a low temperature, preferably ambient air stream comprising the steps of: (i) causing relatively moist plant material to flow across a high velocity air stream while being maintained as a rotating band within the air stream; (ii) retaining the plant material in the said band to comminute the plant material and to cause physical separation of liquids from the plant material as an aerosol;
  • the invention resides in an apparatus for low temperature drying of plant material, the apparatus comprising a flow dryer having an inlet duct in series with aerosolizer followed by an outlet duct, the said aerosolizer having a chamber including an aerosolizer inlet communicating with the inlet duct and an aerosolizer outlet communicating with the outlet duct in order for a stream of low temperature gas to flow through the aerosolizer chamber, a plurality of aerosolizing blades mounted for rotation in the aerosolizer chamber so that particles of matter circulate in the aerosolizer chamber as a band by reason of the rotation of the blades, the rotation of the blades and the high velocity air stream through the chamber causing separation of unbound liquids as an aerosol entrained in the air stream which leaves the chamber through the outlet.
  • low temperature means a temperature, normally ambient, but can be above ambient, such as to minimise heat degradation of nutritional factors in the product or products being processed.
  • the present invention embodies a process whereby the primary mechanism for separation of liquids from the plant material is a physical process rather than a thermodynamic process.
  • the plant material in the aerosolizer is broken up by the rotating blades and the smaller particles are maintained in a band under the influence of a high velocity air stream ranging in velocity from 5 metres per second to 25 metres per second. This causes a capillary type action to extract further unbound moisture from the plant material.
  • a high velocity air stream ranging in velocity from 5 metres per second to 25 metres per second.
  • liquid including water and oils are released from the plant material, this liquid is caused to form droplets within the air stream and is then carried out of the aerosolizer where it can be processed through a condenser to obtain a liquid from which the oils can be extracted. Due to the low temperature the oils are maintained in their most nutritious state.
  • the aerosolizer is utilised as part of a pre-dryer assembly whereby after exiting the aerosolizer the partially dried comminuted material is then fed into a thermodynamic flow dryer where it is further dried under evaporative drying.
  • the aerosolizer preferably comprises a cylindrical chamber having a peripheral wall, a central shaft carrying longitudinally spaced radially extending blades, the blades extending to the peripheral wall of the chamber and the speed of rotation of the blades and their spacing being selected to form incoming material into an annular fluidised bed adjacentthe peripheral wall, the aerosolizer having an air inlet and an air outlet for moving material in a downstream direction and a fluidised bed interrupter between the inlet and the outlet interrupting flow of the fluidised bed to increase the residence time of material in the aerosolizer chamber.
  • the interrupter is adjustable to enable residence time to be varied.
  • Figure 1 B is a section through a typical aerosolizing chamber; and Figure 2 illustrates a two stage drying process whereby material is pre-dried in an aerosolizer and then processed through an evaporative dryer.
  • Figures 3 and 4 are longitudinal section and cross-section through a typical aerosolizer.
  • METHOD OF PERFORMANCE Referring to the drawings and initially to Figure 1 A there is illustrated a low temperature dryer 10 where the central element of the dryer is a cold aerosolizer 1 1 having an infeed auger 12 from an infeed bin 13 and an air inlet 14 and a product, aerosol and air outlet duct 15.
  • the cold aerosolizer comprises a central shaft 16 and a plurality of blades 17. This is illustrated in section in Figure 1 B.
  • the outlet duct then carries the partially dried material, the aerosol and air into a cyclone where the plant material is extracted, that is cyclone 18, while the air and the aerosols flow to a condenser 19 where the liquids are removed.
  • the dry air is discharged at 20.
  • the process operates usually at ambient conditions but does not exclude the application of a small amount of heat to raise the air temperature to say 20°C where desirable.
  • the aerosolizer chamber 1 1 is illustrated showing blades 1 7 and the outlet from the chamber at 21 .
  • the outlet from the chamber includes an opening that has a sliding closure member 22 so that the size and position of the opening can be varied to adjust the size of the material removed.
  • the system comprises a co-dependent two stage process.
  • the first process is aerosolizing and moisture reduction involving items 31 to 40 inclusive.
  • the second process is final drying involving items 41 to 50 inclusive.
  • the main principles of the system are as follows.
  • a vacuum is produced by a fan 31 which is used for both the transport of air and for the mechanical movement of the product through the aerosolizing system.
  • the process air enters the system tangential ly through a duct 32 into the cold aerosolizing cylinder 34.
  • the product enters the system through an infeed buffer bin/feed auger 33 feeding axially to a cold aerosolizing assembly 34 and 35.
  • the cold aerosolizing chamber 34 is comprised of a horizontal cylinder with either a series of rotating aerosolizing blades or a rotating squirrel cage assembly 35.
  • the objective of the cold aerosolizing chamber assembly 34 and 35 is the comminution of the product as well as the creation of a fluidised bed of product and air around the internal periphery of the cold aerosolizing cylinder 34.
  • the selection of aerosolizing blade assembly or squirrel cage assembly is dependent upon the exact product to be processed as well as the desired specification of the product required post processing.
  • the air/product mixture exits the cold aerosolizing chamber assembly 34 and 35 through an adjustable aperture 36.
  • the adjustable aperture facilitates the control of the product retention time within the cold aerosolizing chamber assembly 34 and 35.
  • the air/product mixture travels via a tower duct 37 to the cyclone 38.
  • the cyclone 38 is responsible for the separation of the product and the process air.
  • the product exits the aerosolizing system through the rotary valve 39 placed at the bottom of the cyclone 38 and is conveyed by a chute or auger 41 to the drying tower 42 and the process air exits the cyclone 38.
  • the air travels to the condenser 40 where any water or oil aerosols are extracted before continuing on to the fan 31 .
  • the velocity and quantity of air is determined by a discharge louvre on the exit duct of the fan 31 . Beyond the fan 31 the air is to be ducted either to the atmosphere or to a secondary air treatment plant in accordance with prevailing local requirements.
  • a vacuum is produced by a fan 48 which is used for both the transport of air and for the mechanical movement of the product through the drying system.
  • Hot air generated by the burner at the end of the burner chamber/manifold duct 45 passes through the perforated plate 44 and the slow rotating disc agitator
  • the product is deposited by the chute/auger 41 onto the slow rotating disc agitator 43 and perforated plate 44 located within the drying tower 42 and aligned at an angle to the drying tower 42.
  • the slow rotating disc agitator 43 consists of a spoke wheel type arrangement positioned directly above and close to the perforated plate 44. The purpose of this assembly is to maintain the product within the air stream and not allow it to settle at the bottom of the drying tower 42.
  • the design of the drying tower 42 is such that retention of the product is required for a few seconds before the mass of the product can attain the terminal velocity of the air passing through the system.
  • the product can only be evacuated out of the drying tower 42 once the evaporation is sufficient for it to attain a speed close to terminal velocity.
  • the product/air stream flows from the drying tower 42 directly into the cyclone 46.
  • the cyclone 46 is responsible for the separation of the product and the process air.
  • the product exits the drying system through the rotary valve 47 placed at the bottom of the cyclone 46.
  • the air travels on to the fan 48.
  • the velocity and quantity of air is determined by a discharge louvre on the exit duct of the fan 31 . Beyond the fan 48 the air is to be ducted either to the atmosphere or to a secondary air treatment plant in accordance with prevailing local requirements.
  • Oversize particles whose size/mass exceed the transport capacity of the air stream within the drying tower 42 will exit the drying tower 42 through a sealed side opening and exit through the rotary valve 49.
  • An auger 50 will transport the oversize particles back to the infeed buffer bin/feed auger 33 to be passed through the entire process again.
  • the aerosolizer 51 includes a cylindrical chamber 52 having a shaft 53, and inlet 54 and outlet 55.
  • An adjustable fluidised bed interrupter plate 56 is adapted to slide into the chamber to interrupt the flow of the annular fluidised bed 56 formed by rotating of the blades 57.
  • the interrupter plate forms a chord blocking the fluidised bed and causing it to distort and flow down around the plate thus causing the particles in the bed to remain longer in the aerosolizer than would otherwise be the case, adjusting the depth of the plate enables the residence time to be varied.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La figure illustre un séchoir basse température (10) dans lequel l'élément central du séchoir est une unité aérosol froid (11) ayant une vis d'alimentation (12) à partir d'une trémie d'alimentation (13) et une admission (14) d'air ainsi qu'un conduit (15) de produit, d'aérosol et de sortie d'air. L'unité d'aérosol principale comprend un axe central (16) et une pluralité de lames (17). Le conduit de sortie transporte ensuite la matière partiellement séchée, l'aérosol et l'air jusque dans un cyclone (18) où la matière végétale est extraite alors que l'air et les aérosols s'écoulent jusqu'à un condenseur (19) où les liquides sont extraits. L'air sec est déchargé au niveau d'une sortie (20) du système. L'expression 'basse température' citée ici signifie une température normalement ambiante mais pouvant être supérieure à la température ambiante, de manière à réduire au minimum la dégradation thermique des facteurs nutritifs se trouvant dans le produit ou les produits en cours de traitement.
PCT/AU1999/000530 1998-06-30 1999-06-30 Sechoir a flux basse temperature et procede WO2000001256A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45921/99A AU4592199A (en) 1998-06-30 1999-06-30 Low temperature flow dryer and process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPP4387 1998-06-30
AUPP4387A AUPP438798A0 (en) 1998-06-30 1998-06-30 Low temperature flow dryer and process

Publications (1)

Publication Number Publication Date
WO2000001256A1 true WO2000001256A1 (fr) 2000-01-13

Family

ID=3808630

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1999/000530 WO2000001256A1 (fr) 1998-06-30 1999-06-30 Sechoir a flux basse temperature et procede

Country Status (2)

Country Link
AU (1) AUPP438798A0 (fr)
WO (1) WO2000001256A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005058073A1 (fr) * 2003-12-17 2005-06-30 Kraft Foods Holdings, Inc. Procede de traitement thermique et de mouture en une seule etape de grains de cafe, et leurs produits
US7000333B2 (en) 2004-01-21 2006-02-21 Abc, Llc Animal byproduct conversion system and method
CN103271420A (zh) * 2013-06-13 2013-09-04 昌宁笑果果食品有限公司 液体介质传送热能的果品烘干机
CN106666784A (zh) * 2016-12-30 2017-05-17 绵阳八叶长风工业设计有限公司 开心果高效烘干机
CN108497526A (zh) * 2018-05-07 2018-09-07 江南大学 用于调理果蔬的常压超声雾化-低频微波脉冲喷动干燥装置及其应用
WO2019051551A1 (fr) * 2017-09-13 2019-03-21 Reflex Instruments Asia Pacific Pty Ltd Appareil de préparation d'échantillon par lots
CN114403475A (zh) * 2021-12-30 2022-04-29 安徽省蓝御电器科技有限公司 一种可应对多种果蔬烘干的可调节式烘干加热脱水工艺
CN117128728A (zh) * 2023-10-23 2023-11-28 江苏南通创源材料科技有限公司 一种基于冶金技术的固体材料干燥设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990005026A1 (fr) * 1988-11-03 1990-05-17 Akt Consultants Pty Limited Appareil et procede de sechage et de pulverisation de substances
WO1992012796A1 (fr) * 1991-01-21 1992-08-06 Bontech Engineering A/S Procede pour la desintegration et/ou le sechage en continu de matieres telles que pate, boue, tourteau, gateau de filtre ou similaire, notament de matieres fibreuses, et appareil pour la mise en ×uvre du procede
WO1995012795A1 (fr) * 1993-11-01 1995-05-11 Beloit Technologies, Inc. Secheur de grandes particules de grand diametre a deflecteurs ajustables

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990005026A1 (fr) * 1988-11-03 1990-05-17 Akt Consultants Pty Limited Appareil et procede de sechage et de pulverisation de substances
WO1992012796A1 (fr) * 1991-01-21 1992-08-06 Bontech Engineering A/S Procede pour la desintegration et/ou le sechage en continu de matieres telles que pate, boue, tourteau, gateau de filtre ou similaire, notament de matieres fibreuses, et appareil pour la mise en ×uvre du procede
WO1995012795A1 (fr) * 1993-11-01 1995-05-11 Beloit Technologies, Inc. Secheur de grandes particules de grand diametre a deflecteurs ajustables

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005058073A1 (fr) * 2003-12-17 2005-06-30 Kraft Foods Holdings, Inc. Procede de traitement thermique et de mouture en une seule etape de grains de cafe, et leurs produits
US7000333B2 (en) 2004-01-21 2006-02-21 Abc, Llc Animal byproduct conversion system and method
CN103271420A (zh) * 2013-06-13 2013-09-04 昌宁笑果果食品有限公司 液体介质传送热能的果品烘干机
CN106666784A (zh) * 2016-12-30 2017-05-17 绵阳八叶长风工业设计有限公司 开心果高效烘干机
WO2019051551A1 (fr) * 2017-09-13 2019-03-21 Reflex Instruments Asia Pacific Pty Ltd Appareil de préparation d'échantillon par lots
US12111105B2 (en) 2017-09-13 2024-10-08 Reflex Instruments Asia Pacific Pty Ltd Batch sample preparation apparatus
CN108497526A (zh) * 2018-05-07 2018-09-07 江南大学 用于调理果蔬的常压超声雾化-低频微波脉冲喷动干燥装置及其应用
CN108497526B (zh) * 2018-05-07 2023-09-19 江南大学 调理果蔬的常压超声雾化-低频微波脉冲喷动干燥装置
CN114403475A (zh) * 2021-12-30 2022-04-29 安徽省蓝御电器科技有限公司 一种可应对多种果蔬烘干的可调节式烘干加热脱水工艺
CN114403475B (zh) * 2021-12-30 2023-01-31 安徽省蓝御电器科技有限公司 一种可应对多种果蔬烘干的可调节式烘干加热脱水工艺
CN117128728A (zh) * 2023-10-23 2023-11-28 江苏南通创源材料科技有限公司 一种基于冶金技术的固体材料干燥设备
CN117128728B (zh) * 2023-10-23 2024-04-05 江苏南通创源材料科技有限公司 一种基于冶金技术的固体材料干燥设备

Also Published As

Publication number Publication date
AUPP438798A0 (en) 1998-07-23

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