WO2007065279A1 - Procede et dispositif pour le sechage en continu de riz - Google Patents

Procede et dispositif pour le sechage en continu de riz Download PDF

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Publication number
WO2007065279A1
WO2007065279A1 PCT/CH2006/000645 CH2006000645W WO2007065279A1 WO 2007065279 A1 WO2007065279 A1 WO 2007065279A1 CH 2006000645 W CH2006000645 W CH 2006000645W WO 2007065279 A1 WO2007065279 A1 WO 2007065279A1
Authority
WO
WIPO (PCT)
Prior art keywords
rice
drying
temperature
fluidized bed
paddy
Prior art date
Application number
PCT/CH2006/000645
Other languages
German (de)
English (en)
Inventor
Enrique Niño PEREZ
Leo Eisenring
Urs Keller
Eliana Zamprogna
Christian Ettel
Original Assignee
Bühler AG
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 Bühler AG filed Critical Bühler AG
Priority to CN200680046231XA priority Critical patent/CN101326420B/zh
Publication of WO2007065279A1 publication Critical patent/WO2007065279A1/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
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Definitions

  • the invention relates to a process for the continuous drying of rice, in particular paddy rice, and a device for the continuous drying of rice.
  • Freshly harvested rice has an initial moisture content of more than 20%, which must be reduced to a storage moisture content of approx. 14%.
  • the roughly pre-cleaned rice (paddy) is first stored in dryer pre-cells, before being dried by mechanical dryers. Drying takes place predominantly in several passages in roof dryers to which warm air of 50-60 ° C. is applied (for example in accordance with WO 98/45656). There is a waiting time of up to 12 hours between the individual passages. As with tower dryers, a limited degree of drying of up to 2% is possible. A standoff of at least 2 hours is required between the individual passages in order to achieve temperature compensation between the grain and the shell. The necessary mechanical transport processes increase the breakage.
  • Static drying in silos or halls requires large areas because the layer thickness of the rice to be dried is limited (approx. 80 to 100 cm). The drying runs unevenly from the inside out due to the arrangement of the ventilation devices and it is difficult to control because there is no really even air distribution. The time expenditure is also high.
  • DE-A-2938620 shows a continuous dryer with a cylindrical drying zone which has perforated plates. This is followed by a similarly designed cooling zone.
  • the DE-A- 41 19787 shows a conditioning device for bulk plant materials with a closed, tunnel-like conditioning station, through which a transport path leads, on which the bulk material is guided. The bulk material is exposed to a gaseous heat transfer medium.
  • Such conveyors can have porous surfaces through which hot or cold gases can flow in order to heat or cool grain and to reduce the moisture content (WO 01/02786).
  • DE-A-19806951 discloses a device for puffing granular material, in which the material is heated batchwise in a fluidized bed chamber.
  • EP-A-1099380 discloses a process for the production of heat-treated cereals, the heat treatment being carried out by means of a gas stream in an annular fluidized bed. The gas flow has different speed components.
  • raw rice with about 18% moisture content with hot air at about 140 0 C is heated for about 30 minutes. Drying can take place in a drum dryer or in a fluidized bed, with the starch being thermally influenced. The dried paddy rice is then directly peeled or peeled and cooled if the peeling is necessary to achieve an easily cookable, unpolished rice.
  • Dried and pre-cleaned rice can then be stored like any other grain until it is ready for processing.
  • the invention is based on the object to at least partially eliminate the disadvantages of the prior art and to develop a method for the continuous drying of rice, in particular paddy.
  • the problem is solved with the features of claim 1 and advantageous embodiments are disclosed in the subclaims.
  • the invention is based on the assumption that rice (paddy) could behave similarly to a polymer under certain humidity and temperature conditions, since, depending on the constellation of these conditions, a glassy or rubbery state is possible.
  • paddy At a low temperature (up to room temperature) and an initial humidity greater than 20%, paddy is glassy, but changes to a rubbery state when the temperature rises. This condition can now be maintained while maintaining the temperature and dehumidifying at the same time. When it cools down, the paddy returns to a glassy state.
  • This knowledge can now be used to dry paddy with high initial moisture (e.g. 22-24%) in a continuous process and still avoid grain breakage.
  • the Paddy is to heated to a temperature above 50 ° to 55 0 C,% in stages to about 13 moisture content and subsequently dried at ambient temperature but at least cooled to below 40 ° C.
  • the heating and drying is preferably carried out in a fluidized bed.
  • the internal pressure in the grain of rice increases due to the evaporation of water.
  • pressure equalization between grain and. Moisture can escape from the surrounding area.
  • the treatment in the fluidized bed is carried out in several stages, in particular in four stages.
  • annealing takes place in a fluidized bed before any further drying (called post-drying).
  • post-drying After a final stage, a combined drying / cooling to 13% moisture content or. a temperature of approx. 35 ° C.
  • the rice breakage is significantly reduced by specifically coordinating the drying and cooling of the paddy.
  • the disclosed procedure can also be used to adapt to the initial conditions of rice and process air.
  • Another object is to provide a device for the continuous drying of rice, particularly suitable for carrying out the method according to the invention.
  • Separators and readout machines known per se for pre-cleaning and fluidized bed apparatus for drying are used here.
  • the invention is described below in two exemplary embodiments with reference to a drawing.
  • the drawing shows a simplified diagram in the single figure.
  • the raw rice delivered with a moisture content of approx. 22% -24% passes from a depot 1 into a drum screen 2, where very coarse impurities are removed.
  • This is followed by further pre-cleaning in a separator / classifier 3 in order to separate stones, sand but also light impurities such as paper, straw or loose shells.
  • the design of the pre-cleaning depends on the degree of contamination of the raw rice delivered. It is advantageous to largely separate loose impurities and additives from the paddy rice before further treatment.
  • a further Depot 4 of the rice enters into a first fluidized bed apparatus 5, in which a rice layering of flows of hot air down, heated to at least about 5O 0 C and is dried to about 3-4% moisture .
  • the rice then passes directly into a second fluidized bed apparatus 6, in which the temperature is raised and drying takes place by a further 3-4% moisture, so that a moisture content of approximately 18% is achieved.
  • the paddy subsequently arrives in a stand-off container 7, which is not explicitly shown, where a first tempering is carried out.
  • the paddy then arrives in a third fluidized bed apparatus (not shown) for subsequent drying and then in another stand-off container for a second tempering.
  • This second tempering is followed by a further drying step in a fourth fluidized bed apparatus, which is followed by a third tempering.
  • the Paddy passes into a further silo where the Paddy in the reverse air current to about 35 0 C and cooled simultaneously to again about 1% is dried to a final moisture content of about 12.5% -13% is achieved becomes.
  • the evaporative cooling of the water in the paddy
  • Level and / or temperature probes are arranged in the latter silo cell in order to achieve certain product heights with a defined dwell time.
  • the paddy is heated in each drying stage (pre- and post-drying) so that the paddy is always in a rubber-elastic state.
  • the rice can also be cooled more quickly (with or without pre-cooling in the second fluidized bed apparatus 6) in a countercurrent cooler, for example within about 15 minutes.
  • the Unterhalfder plant is also less complex and due to the short drying times, the paddy rice can be stored faster or more rice can be purchased at harvest time.
  • very moist raw rice (for example with an initial moisture content of approx. 37%) is dried in a roof dryer with a fluid bed in several stages.
  • the first stage may already take place with superheated steam of about 12O 0 C for 3 hours.
  • the humidity is reduced to approx. 20-22%.
  • the steam supply is gradually reduced and the air or steam temperature is also gradually reduced to 50 ° C.
  • the result is a moisture content of approx. 13%.
  • the rice is inside a. cooled to ambient temperature within half an hour, with no more steam being supplied. A moisture content of approx. 12.5% can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Storage Of Harvested Produce (AREA)

Abstract

L’invention concerne un procédé et un dispositif pour le séchage en continu de riz, notamment de riz paddy ayant une teneur initiale en eau élevée. L’objectif est de réduire de manière significative la durée de traitement et la rupture des grains. Cet objectif est atteint selon l’invention en réalisant, après un nettoyage préliminaire du riz paddy, un séchage par étapes dans un lit fluidisé associé à un chauffage graduel, le riz paddy étant ensuite refroidi.
PCT/CH2006/000645 2005-12-09 2006-11-15 Procede et dispositif pour le sechage en continu de riz WO2007065279A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200680046231XA CN101326420B (zh) 2005-12-09 2006-11-15 用于连续地干燥稻的方法及装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1963/05 2005-12-09
CH19632005A CH697287B1 (de) 2005-12-09 2005-12-09 Verfahren und Einrichtung zur kontinuierlichen Trocknung von Reis.

Publications (1)

Publication Number Publication Date
WO2007065279A1 true WO2007065279A1 (fr) 2007-06-14

Family

ID=37591677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2006/000645 WO2007065279A1 (fr) 2005-12-09 2006-11-15 Procede et dispositif pour le sechage en continu de riz

Country Status (3)

Country Link
CN (1) CN101326420B (fr)
CH (1) CH697287B1 (fr)
WO (1) WO2007065279A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2060191A1 (fr) * 2007-11-16 2009-05-20 Bühler AG Composition alimentaire à base de riz et procédé pour sa fabrication
WO2009111900A2 (fr) * 2008-03-12 2009-09-17 Bühler AG Procédé de fabrication de riz
WO2010122166A1 (fr) * 2009-04-24 2010-10-28 Bühler AG Procédé de séchage du riz
DE102017222737A1 (de) 2017-12-14 2019-06-19 Bühler Barth Gmbh Wärmebehandlung von stückigen Lebensmitteln

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109668420A (zh) * 2018-11-03 2019-04-23 贵州颗米食品科技有限公司 一种薏仁米烘干装置及烘干方法
CN111336771B (zh) * 2020-03-03 2021-08-03 济宁学院 一种粮食干燥装置及方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766030A (en) * 1926-08-02 1930-06-24 Edgar T Meakin Apparatus for and method of treating material
US4419834A (en) * 1980-08-11 1983-12-13 Proctor & Schwartz Treating fluidized material
US4479309A (en) * 1982-04-05 1984-10-30 Tolson Raymond C Method and apparatus for drying cereal grain
US5002787A (en) * 1987-01-05 1991-03-26 Association pour la Recherche et le des Methodes et Processus Industrieles (A.R.M.I.N.E.S.) Method for drying products in divided form, particularly cereals
WO2001012287A2 (fr) * 1999-08-17 2001-02-22 Unilever N.V. Dispositif servant a extraire un element liquide hors de particules de materiau solide
JP2001292631A (ja) * 2000-04-12 2001-10-23 Yokogawa Electric Corp 穀物貯蔵システム
WO2005017431A1 (fr) * 2003-08-19 2005-02-24 Bühler AG Procede et dispositif de sechage continu du riz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1047731A (zh) * 1989-05-27 1990-12-12 高惠民 多筒回转式热风喷射连续物料干燥机
CN2383024Y (zh) * 1999-06-25 2000-06-14 陈国奎 燃重油顺逆流式粮食干燥机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766030A (en) * 1926-08-02 1930-06-24 Edgar T Meakin Apparatus for and method of treating material
US4419834A (en) * 1980-08-11 1983-12-13 Proctor & Schwartz Treating fluidized material
US4479309A (en) * 1982-04-05 1984-10-30 Tolson Raymond C Method and apparatus for drying cereal grain
US5002787A (en) * 1987-01-05 1991-03-26 Association pour la Recherche et le des Methodes et Processus Industrieles (A.R.M.I.N.E.S.) Method for drying products in divided form, particularly cereals
WO2001012287A2 (fr) * 1999-08-17 2001-02-22 Unilever N.V. Dispositif servant a extraire un element liquide hors de particules de materiau solide
JP2001292631A (ja) * 2000-04-12 2001-10-23 Yokogawa Electric Corp 穀物貯蔵システム
WO2005017431A1 (fr) * 2003-08-19 2005-02-24 Bühler AG Procede et dispositif de sechage continu du riz

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2060191A1 (fr) * 2007-11-16 2009-05-20 Bühler AG Composition alimentaire à base de riz et procédé pour sa fabrication
WO2009062322A1 (fr) * 2007-11-16 2009-05-22 Bühler AG Compositions alimentaires à base de riz et leur fabrication
WO2009111900A2 (fr) * 2008-03-12 2009-09-17 Bühler AG Procédé de fabrication de riz
WO2009111900A3 (fr) * 2008-03-12 2010-09-23 Bühler AG Procédé de fabrication de riz
WO2010122166A1 (fr) * 2009-04-24 2010-10-28 Bühler AG Procédé de séchage du riz
CH700876A1 (de) * 2009-04-24 2010-10-29 Buehler Ag Verfahren zum Herstellen von Reis.
US9060534B2 (en) 2009-04-24 2015-06-23 Bühler AG Method for drying rice
DE102017222737A1 (de) 2017-12-14 2019-06-19 Bühler Barth Gmbh Wärmebehandlung von stückigen Lebensmitteln

Also Published As

Publication number Publication date
CH697287B1 (de) 2008-08-15
CN101326420A (zh) 2008-12-17
CN101326420B (zh) 2011-05-11

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