CN1823250A - Method and device for continuous drying of rice - Google Patents
Method and device for continuous drying of rice Download PDFInfo
- Publication number
- CN1823250A CN1823250A CNA038269279A CN03826927A CN1823250A CN 1823250 A CN1823250 A CN 1823250A CN A038269279 A CNA038269279 A CN A038269279A CN 03826927 A CN03826927 A CN 03826927A CN 1823250 A CN1823250 A CN 1823250A
- Authority
- CN
- China
- Prior art keywords
- rice
- drying
- stage
- dry
- fluidized bed
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Cereal-Derived Products (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
Abstract
The invention relates to a method and a device for continuously drying rice, especially paddy. The aim of the invention is to significantly shorten the treatment time while substantially reducing breaking of the grains. Said aim is achieved by performing a drying process in a fluidized bed following preliminary cleaning of the paddy, the paddy being tempered or cooled only in a subsequent process.
Description
Technical field
The present invention relates to a kind of particularly method of paddy rice of continuous drying rice that is used for, also relate to the device that is used for the continuous drying rice.
Background technology
The rice of new results has the initial humidity greater than 20%, and this humidity must reduce to about 14% storage humidity.The rice (paddy rice) of thick step prerinse begins to be placed in the initial drying machine unit, and next carries out drying by mechanical drying machine.Drying is mainly carried out in the several passages in box drier (roof drier), and this passage is exposed to (for example according to WO 98/45656) in the air that is heated to 50-60 ℃.The adjusting time between each passage reaches 12 hours.If in drying tower, then may have only the drying of 2% limited extent.Independently need at least 2 hours adjusting period between the passage at each, to obtain the temperature balance between cereal and the drying machine housing.Necessary mechanical course of conveying has increased the formation in crack.
Static dry surface area that need be bigger in silo or factory building is because the bed thickness of rice to be dried limited (about 80-100cm).Suppose that the words drying that is furnished with ventilation equipment from inside to outside anisotropically carries out, and be not easy controlled because in fact air distributes equably.Required time is very long.
According to DE-A-2926256, the process that is used for dried grain comprises the heating fresh air and makes it pass through cereal that fresh air is tentatively cooled off to reduce its water capacity in this process.DE-A-2947759 discloses a kind of similar scheme.
DE-A-2938620 has disclosed a kind of continuous-flow drying machine, has the cylindrical shape dry section, and this drying machine has the plate that has the hole, is thereafter the cooling zone of identical configuration.DE-A-4119787 discloses a kind of adjusting device of the vegetable foodstuff that is used to stack, and its funnel-form with sealing is regulated the station, and transfer passage advances by this adjusting station, carries the material of stacking.Stacking material is exposed in the gaseous state heating carrier herein.
This conveyer can have porous surface, by this surface, heat or cold gas can flow with heating or cooling cereal, and reduce water capacity (WO 01/02786).
DE-A-19806951 discloses a kind of device that is used to blow loose granular goods, and wherein said material stands to heat in the fluid bed chamber in batches.EP-A-1099380 discloses a kind of method that is used for production heat treatment cereal, and wherein, described heat treatment is undertaken by gas stream in the ring-type fluid bed.Described gas stream has different velocity components.
In JP-A-58056650, the former rice with about 18% water capacity about 30 minutes with about 140 ℃ hot air.Can carry out drying in swing drying machine or fluid bed, wherein starch is subjected to heat affecting.If it is necessary shelling for the rice that does not spill that obtains boiling easily, then the former rice that then drying is crossed is directly shelled or shells and cools off.
Then drying is crossed with the rice of prerinse and as other cereal, stored, when it wants processed.
Summary of the invention
The objective of the invention is to eliminate described defective of the prior art, and develop a kind of method that is used for the continuous drying rice, particularly paddy rice to small part.Purpose of the present invention is realized by the feature in the claim 1, and its most preferred embodiment is come open by dependent claims.
The present invention is based on rice (paddy rice) has similar polymer under the moist and temperature conditions at some this supposition of characteristic, because vitrifying or rubbery state are possible, depends on the collocation (constellation) of these conditions.In lower temperature (low to room temperature) with surpass under 20% the initial humidity, paddy rice is vitrified, but along with temperature raises and enters the rubbery state.This state can only dry simultaneously and could obtain by keeping temperature.When cooling, paddy rice reaches the vitrifying state again.This knowledge can be used for now with the dry paddy rice of continuous process, and can also avoid the cereal fracture.For this reason, paddy rice is heated to about 50-55 ℃, is dried to about 14% water capacity, is cooled to environment temperature then.
Heating and drying are preferably in fluid bed carries out.By evaporation of water, the interior pressure in the grain of rice increases in the fluid bed of heat.Pressure compensation between the grain of rice and the environment allows moisture to come out from cereal.
Processing in the fluid bed can be undertaken by one, two or more stage.In two sections dry runs, there is not the intermediate regulations process, and the second stage drying/cooling procedure of a combination preferably.
In the process of supplying with vapours, suppose that the water capacity of paddy rice is higher, then dry run can begin (reaching 120 ℃) with higher temperature.
Another purpose provides a kind of device that is used for the continuous drying rice, particularly a kind of device that is suitable for carrying out the inventive method.Come prerinse with known sieve and selector herein, at least one fluidized bed plant is used for drying.Change in the example at one, can arrange two fluidized bed plants according to the order of sequence, wherein second device can also comprise cooler (precooler) except that drying machine.
Description of drawings
To describe the present invention in detail by two exemplary embodiments based on accompanying drawing below, and have only an accompanying drawing, i.e. Fig. 1 the figure shows the flow process of simplification.
The specific embodiment
The former rice of being supplied with enters into drum screen 2 from storage vault 1, and a large amount of herein impurity are removed.Be another pre-clean step of in sifter/grader 3, carrying out then, to remove sandstone, sand and lighter impurity, as the shell of paper, straw or pine.The precleaning device is configured to have what kind of impurity to become according to the former rice of being supplied with.Advantageously, before further handling, from former rice, isolate loose impurity and mixture substantially.
After carrying out simple intermediate storage in precleaning with in another storage vault 4, rice arrives first class bed apparatus 5, wherein, with one deck rice by hot-air from following conveying, rice is heated to about 50 ℃, and the moisture of about 3-4% that is dried.Rice directly arrives second fluidized bed plant 6 then, wherein keeps about 50 ℃ temperature, and the be dried moisture of other 3-4% of rice.In last 1/3rd sections of this second fluid bed 6, rice is cooled to about 40 ℃.
Paddy rice enters and regulates container 7 then, and herein, it is slowly cooled (about 20 hours) to environment temperature, loses other 1% moisture in this process.Heat treatment/adjusting time can reduce by suitable mechanism.
As heat treated replacement, rice also can be cooled off (be with or without carry out pre-cooled) faster in second fluidized bed plant 6 in counter-current cooler, for example within 15 minutes.
Under the situation that sharply reduces drying time with respect to conventional method, reduced the situation of cereal fracture.Native system also keeps in repair cheaply, and lower dry number of times makes and can store former rice quickly in the harvest season, or obtains more rice.
In another embodiment, in box drier (roofdrier), very moist former rice (for example initial humidity is about 37%) is carried out drying by several stages with fluid bed.Phase I can be carried out 3 hours drying with about 120 ℃ vapours, and moisture reduces to about 20-22% then.In 1 hour other stage, the dry continuation under being supplied with by the steam of throttling gradually, wherein air or vapor (steam) temperature also reduce to 50 ℃ gradually.Water capacity becomes about 13% as a result.In last step, rice is cooled to environment temperature in half an hour, does not wherein have more steam to supply with again.Can obtain about 12.5% water capacity.
The reference number tabulation
1 storage vault
2 drum screens
3 sifters
4 storage vaults
5 fluidized bed plants
6 fluidized bed plants
7 regulate container
Claims (17)
1. the continuous drying rice method of paddy rice particularly comprises rice is carried out precleaning and carries out drying by hot-air, it is characterized in that described rice is carrying out drying after the precleaning in fluid bed.
2. method according to claim 1 is characterized in that, described drying is dry in fluid bed by a stage.
3. method according to claim 1 is characterized in that, described drying in fluid bed comprises two stages.
4. method according to claim 1 is characterized in that, described drying in fluid bed comprises the plural stage.
5. method according to claim 3 is characterized in that, comprises dry and pre-cooled at fluid bed described in the second stage.
According to each described method among the claim 1-5, it is characterized in that 6. described rice is dried to about 13% water capacity under about 50-55 ℃ temperature, and after drying, be slowly cooled/temperature adjustment is to environment temperature.
7. method according to claim 5 is characterized in that, described pre-cooledly carry out in last 1/3rd sections of second stage.
8. according to each described method of claim 1-5 or 7, it is characterized in that described rice is dried to about 13% water capacity under about 50-55 ℃ temperature, and in adverse current, be cooled to environment temperature after the drying.
9. according to claim 1 or 4 described methods, it is characterized in that described dry vapours with supply is carried out in the stage in several temperature.
10. method according to claim 9 is characterized in that, described vapours was supplied to about 120 ℃ in the phase I, and its temperature reduces to about 50 ℃ gradually in next stage.
11. method according to claim 10 is characterized in that, described steam is supplied with by throttling gradually.
12. one kind is used for the particularly device of paddy rice of continuous drying rice, comprises the precleaning of rice and is used for device by the dry rice of hot-air, it is characterized in that, describedly is used for dry device and comprises at least one fluidized bed plant (5,6).
13. device according to claim 12 is characterized in that, described two fluidized bed plants (5,6) are provided with in order.
14. device according to claim 13 is characterized in that, described second fluidized bed plant (6) comprises a dry section and a cooling zone.
15., it is characterized in that described cooling stage is arranged in described at least one fluidized bed plant (5,6) back according to each described device in the claim 12 to 14.
16. device according to claim 15 is characterized in that, described cooling stage is integrated in the described fluidized bed plant (5,6).
17., it is characterized in that described fluidized bed plant is a box drier according to each described device among the claim 12-16.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH2003/000558 WO2005017431A1 (en) | 2003-08-19 | 2003-08-19 | Method and device for the continuous drying of rice |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1823250A true CN1823250A (en) | 2006-08-23 |
Family
ID=34140491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA038269279A Pending CN1823250A (en) | 2003-08-19 | 2003-08-19 | Method and device for continuous drying of rice |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2007533939A (en) |
| CN (1) | CN1823250A (en) |
| AU (1) | AU2003250717A1 (en) |
| MX (1) | MXPA06001899A (en) |
| WO (1) | WO2005017431A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH697287B1 (en) * | 2005-12-09 | 2008-08-15 | Buehler Ag | Method and apparatus for continuous drying of rice. |
| DE102008000623A1 (en) * | 2008-03-12 | 2009-09-17 | Bühler AG | Process for making rice |
| CH700876A1 (en) * | 2009-04-24 | 2010-10-29 | Buehler Ag | A method of producing rice. |
| WO2015029530A1 (en) | 2013-08-30 | 2015-03-05 | 北海道特殊飼料株式会社 | Drying method, drying device, and drying system making use of temperature differential |
| CN104848672A (en) * | 2015-04-30 | 2015-08-19 | 苏州科谷米业有限公司 | High-efficiency dust-removing grain dryer |
| DE102017222737A1 (en) | 2017-12-14 | 2019-06-19 | Bühler Barth Gmbh | Heat treatment of chunky foods |
| CN109668420A (en) * | 2018-11-03 | 2019-04-23 | 贵州颗米食品科技有限公司 | A kind of myotonin drying unit and furnace drying method |
Family Cites Families (14)
| 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 |
| DE2926256A1 (en) | 1979-06-29 | 1981-01-08 | Rudolf Reh | Grain drying using heated fresh air - cools air first to reduce humidity, with subsequent heating for grain drying application |
| DE2938620C2 (en) | 1979-09-25 | 1984-11-15 | Engelbrecht + Lemmerbrock Gmbh + Co, 4520 Melle | Continuous dryer for moist grain |
| DE2947759C2 (en) | 1979-11-27 | 1982-11-04 | Alexander 2067 Reinfeld Kückens | Method of drying grain in bulk |
| US4419834A (en) * | 1980-08-11 | 1983-12-13 | Proctor & Schwartz | Treating fluidized material |
| JPS5856650A (en) | 1981-09-28 | 1983-04-04 | Morinaga & Co Ltd | Preparation of easily cookable unpolished rice |
| US4479309A (en) * | 1982-04-05 | 1984-10-30 | Tolson Raymond C | Method and apparatus for drying cereal grain |
| FR2609328B1 (en) * | 1987-01-05 | 1989-05-05 | Armines | PROCESS FOR DRYING PRODUCTS IN DIVIDED FORM, ESPECIALLY CEREALS, AND APPARATUS FOR CARRYING OUT SAID PROCESS |
| DE4119787A1 (en) | 1991-06-15 | 1992-12-17 | Sagemueller Franz Gmbh | METHOD FOR CONTINUOUS CONDITIONING, IN PARTICULAR THERMAL CONDITIONING, OF PUPPED GOODS, PREFERABLY VEGETABLE PLANT GOODS, LIKE CEREALS, HERBS, TOBACCO OR THE LIKE |
| AR009684A1 (en) | 1997-04-07 | 2000-04-26 | Gasset Lazaro Jaime | GRAIN AND SILO DRYING PROCEDURE FOR THE START-UP OF THE PROCEDURE |
| DE19806951A1 (en) | 1998-02-19 | 1999-08-26 | Bichsel | Puffing bulk grains or husked fruit uses fluid bed |
| US6230421B1 (en) | 1999-06-07 | 2001-05-15 | Steven C. Reed, Sr. | Method and apparatus for drying grain |
| AU6692100A (en) * | 1999-08-17 | 2001-03-13 | Have Ten, Sander | Apparatus for removing a fluid component from particulized solid materials |
| EP1099380A1 (en) | 1999-11-12 | 2001-05-16 | Unilever N.V. | Heat treated cereals and process to make this |
-
2003
- 2003-08-19 MX MXPA06001899A patent/MXPA06001899A/en not_active Application Discontinuation
- 2003-08-19 CN CNA038269279A patent/CN1823250A/en active Pending
- 2003-08-19 WO PCT/CH2003/000558 patent/WO2005017431A1/en active Application Filing
- 2003-08-19 AU AU2003250717A patent/AU2003250717A1/en not_active Abandoned
- 2003-08-19 JP JP2005507700A patent/JP2007533939A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003250717A1 (en) | 2005-03-07 |
| MXPA06001899A (en) | 2006-05-31 |
| WO2005017431A1 (en) | 2005-02-24 |
| JP2007533939A (en) | 2007-11-22 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20060823 |