CN1341389A - Rice drying dewatering process - Google Patents
Rice drying dewatering process Download PDFInfo
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- CN1341389A CN1341389A CN01127231A CN01127231A CN1341389A CN 1341389 A CN1341389 A CN 1341389A CN 01127231 A CN01127231 A CN 01127231A CN 01127231 A CN01127231 A CN 01127231A CN 1341389 A CN1341389 A CN 1341389A
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Abstract
The present invention relates to a drying dehydration process of rice drying machine, including the following steps: preheating, parching, slowly temp.-lowering drying, cooling and mitigating, in which the preheating stage can activate the channel for transferring internal water content of grain toward surface, and its mitigating stage can make the internal water content of grain possess enough time to transfer toward external surface so as to make internal and external temp. and water contents of grain come into balance and prevent excessive internal and external pressure difference of grain, so that it is favorable for completely drying grain from interior to exterior, and raising dry uniformity and dried quality or rice.
Description
The present invention relates to the drying dewatering process of cereal.
The dryer that is used for rice drying now is transformed by being used for kind of sub-industry and other rice drying machine basically, mostly adopts the following current oven dry, the adverse current cooling.Owing to adopt following current form oven dry paddy, the paddy that high-temperature hot-air and temperature are lower at first contacts, exist the temperature difference bigger, be to take away moisture content greatly, but, composition (moisture content of paddy is divided into the free water and the inner crystallization water of appearance) from paddy institute water content, the moisture content of being taken away is outside free water, can cause rice drying too fast, the grain surface may form gluey scleroma because temperature is too high, and this has hindered the transfer of grain internal moisture to outer surface on the one hand, also can make the grain internal temperature too high, cause steam inside to press liter, when interior voltage rise is extremely enough big, just be easy to generate quick-fried waist.The basic reason that causes above-mentioned phenomenon is not have tempering or tempering deficiency of time in drying course, can not guarantee that the water evaporates passage in the grain is unimpeded all the time, internal moisture shifts to the surface and is hindered, this moment is as drying or cooling off, the inside and outside pressure reduction of grain will be strengthened, produce penetrating crack, be easy to form quick-fried waist or rice husk and in mechanicalness is peeled off, form and crack rice, influence the oven dry quality of paddy.
The objective of the invention is characteristics, reduce quick-fried waist phenomenon, improve a kind of rice drying dewatering process of oven dry back quality at paddy.
The present invention includes preheating, oven dry, slow cooling and drying, cooling and multistage tempering stage.
Paddy is promoted by elevator and enters the dryer king-tower through material-feeding mechanism, relies on the cooperation of self gravity and discharge mechanism, moves down on slowly having, and realizes above-mentioned technological process in moving, and discharges outside the drying tower after the normal temperature cooling reaches the oven dry quality.Owing to be provided with warm-up phase, activate the passage that the grain internal moisture shifts to the surface, be provided with the tempering stage, make the interior moisture content of grain have time enough to shift to appearance, grain internal and external temperature moisture content tends to balance, and avoids the grain inside and outside differential pressure excessive, help drying fully from the inside to the outside paddy, reduce quick-fried waist or rice husk and in mechanicalness is peeled off, form the phenomenon of cracking rice, improve the uniformity of oven dry, improve the oven dry quality of paddy.
Preheating source of the gas of the present invention is from the waste gas of oven dry, make full use of oven dry waste gas, carry out preheating than the paddy at the end relatively to just entering the oven dry built-in temperature, reduce the temperature difference of paddy and oven dry medium, heating under the waste gas effect that simultaneously, paddy is big in relative humidity, have uniform temperature, " sealing sweat ", make its water evaporates passage expansion, mediation, be convenient to the transfer of moisture content in the paddy, help drying dewatering, improve energy utilization rate simultaneously.
Now further specify in conjunction with a kind of embodiment.
Technological process is: mixed flow preheating, 2 grades of crossing current oven dry, 2 grades of lower the temperature counter-current drying, multistage temperings, that is:
Pre-heating temperature elevation → tempering → crossing current oven dry (forward) → tempering →
Crossing current oven dry (oppositely) → tempering → cooling and drying () → tempering → cooling and drying (two) → tempering → normal temperature adverse current is cooled off, and the exhaust emission tube road of twice crossing current oven dry is connected to the air inlet of pre-heating temperature elevation.
With the continous way is example: water content 17.2%, and the paddy 8t/h that temperature is 14 ℃ is introduced into the pre-heating temperature elevation stage, utilizes the hot-air after drying that paddy is carried out preheating, and the hot blast temperature of warm-up phase is 48 ℃, enters the tempering stage then; Enter crossing current oven dry for the first time again, its bake drying medium (hot blast) temperature is 60 ℃; Carry out tempering again, enter crossing current oven dry for the second time, the bake drying medium temperature is 42 ℃; After tempering, carry out the cooling and drying first time, the drying medium temperature is 30 ℃; After the tempering, carry out the cooling and drying second time, the drying medium temperature is 24 ℃; After tempering class, carry out the normal temperature cooling, the cooling back is discharged by draining crop mechanism, and this moment, the grain temperature was 19.2 ℃, moisture content 14.3%, the whole flow process time is 8.4h, and wherein, the oven dry tempering time is 3.8h, and be 4.6h cool time.
Other Q factor of oven dry back paddy: quick-fried waist increment rate is 1.3%; Broken increment rate is 0.24%; Nonuniformity of drying is 0.55%; Going out machine paddy does not have color and luster variation, the burnt phenomenon of sticking with paste of nothing, reaches excellent 63 standards of association.
Paddy has reduced the temperature difference with the hot blast medium after preheating, the grain surface forms gluey scleroma when preventing to dry, and activates the passage that the grain internal moisture shifts to the surface simultaneously.Through tempering stage for the first time, the relative homogeneous of internal and external temperature, enter for the first time baking stage paddy from top to bottom, hot blast (is called forward) from left to right, and drying medium passes the grain layer.Be provided with a plurality of way to move grains and medium channel in this technology, it is more abundant to make medium and grain carry out damp and hot exchange, and the heat energy utilization rate is very high.Take away grain surface moisture content to greatest extent.Behind first drying, enter tempering, make the interior moisture content of grain have time enough to shift to appearance, grain internal and external temperature moisture content tends to balance, avoid the grain inside and outside differential pressure excessive, help secondary drying, when carrying out secondary drying, the approach axis of hot blast is changed from right to left into (being called oppositely), this is just avoided grain one side temperature too high, the phenomenon of oven dry streaking one.Enter tempering behind the secondary drying, further allow the inside and outside moisture content of grain shift and homogeneous more, enter the cooling and drying stage after the tempering, the cooling and drying stage is adopted the adverse current form, and promptly the drying medium direction is opposite with the grain flow direction, utilizes the medium that has uniform temperature to lower the temperature, can further take away the moisture content of grain on the one hand, the temperature difference that guarantees cooling medium and grain on the other hand differs not too large, makes grain carry out a slow cooling procedure, avoids the increase of percent cracked rice.Two cooling and drying are provided with delay section in the stage, allow grain that a process is slowly arranged in cooling, to guarantee the quality behind the grain heat-drying comprehensively, equably.Through tempering, allow grain carry out heat transmission and water balance after the dry cooling, enter the normal temperature cooling stage, the adverse current form is adopted in the normal temperature cooling, and the grain after the oven dry and the temperature difference of atmosphere are controlled within the scope of requirement.
Claims (4)
1, rice drying dewatering process comprises oven dry, cooling stage, it is characterized in that also comprising preheating, slow cooling and drying and multistage tempering stage.
2, according to the described technology of claim 1, it is characterized in that described oven dry is the oven dry of secondary crossing current, the wind direction of secondary crossing current oven dry is opposite.
3,, it is characterized in that comprising at least the slow cooling and drying of secondary according to the described technology of claim 1.
4,, it is characterized in that the waste gas of preheating source of the gas from oven dry according to claim 1 or 2 or 3 described technologies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01127231A CN1341389A (en) | 2001-09-17 | 2001-09-17 | Rice drying dewatering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01127231A CN1341389A (en) | 2001-09-17 | 2001-09-17 | Rice drying dewatering process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1341389A true CN1341389A (en) | 2002-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01127231A Pending CN1341389A (en) | 2001-09-17 | 2001-09-17 | Rice drying dewatering process |
Country Status (1)
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| CN (1) | CN1341389A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006045234A1 (en) * | 2004-10-28 | 2006-05-04 | Icta Limited | Lithium ion chargeable battery with step-down equipment |
| WO2010102522A1 (en) * | 2009-03-13 | 2010-09-16 | 上海亦晨信息科技发展有限公司 | Black composite grain and method preparing the same |
| WO2010102521A1 (en) * | 2009-03-13 | 2010-09-16 | 上海亦晨信息科技发展有限公司 | Composite grain and method preparing the same |
| CN101878813A (en) * | 2010-06-22 | 2010-11-10 | 武汉工业学院 | Split-range drying method for paddy |
| CN103229829A (en) * | 2013-04-16 | 2013-08-07 | 北京康威盛热能技术有限责任公司 | Process method for rapidly drying grains through countercurrent gas flow |
| CN104886246A (en) * | 2015-05-20 | 2015-09-09 | 舒城县东方粮油种植专业合作社 | Method for quickly drying unhulled rice |
| CN105767161A (en) * | 2016-03-11 | 2016-07-20 | 安徽新生力生物科技有限公司 | Grain mixed flow drying technology |
| CN107712042A (en) * | 2017-09-13 | 2018-02-23 | 安徽鑫泉米业有限公司 | A kind of multiple step format rice drying method |
| CN109601616A (en) * | 2019-01-11 | 2019-04-12 | 中南林业科技大学 | A method of Good quality indica rice head rice rate is improved using radiothermics |
| CN110679651A (en) * | 2019-10-18 | 2020-01-14 | 酒泉市林果服务中心 | Dewaxing-free drying technology for medlar |
| CN112179125A (en) * | 2020-10-15 | 2021-01-05 | 河南科技大学 | Grain drying method and system |
-
2001
- 2001-09-17 CN CN01127231A patent/CN1341389A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006045234A1 (en) * | 2004-10-28 | 2006-05-04 | Icta Limited | Lithium ion chargeable battery with step-down equipment |
| WO2010102522A1 (en) * | 2009-03-13 | 2010-09-16 | 上海亦晨信息科技发展有限公司 | Black composite grain and method preparing the same |
| WO2010102521A1 (en) * | 2009-03-13 | 2010-09-16 | 上海亦晨信息科技发展有限公司 | Composite grain and method preparing the same |
| CN101878813A (en) * | 2010-06-22 | 2010-11-10 | 武汉工业学院 | Split-range drying method for paddy |
| CN103229829A (en) * | 2013-04-16 | 2013-08-07 | 北京康威盛热能技术有限责任公司 | Process method for rapidly drying grains through countercurrent gas flow |
| CN104886246A (en) * | 2015-05-20 | 2015-09-09 | 舒城县东方粮油种植专业合作社 | Method for quickly drying unhulled rice |
| CN105767161A (en) * | 2016-03-11 | 2016-07-20 | 安徽新生力生物科技有限公司 | Grain mixed flow drying technology |
| CN107712042A (en) * | 2017-09-13 | 2018-02-23 | 安徽鑫泉米业有限公司 | A kind of multiple step format rice drying method |
| CN109601616A (en) * | 2019-01-11 | 2019-04-12 | 中南林业科技大学 | A method of Good quality indica rice head rice rate is improved using radiothermics |
| CN110679651A (en) * | 2019-10-18 | 2020-01-14 | 酒泉市林果服务中心 | Dewaxing-free drying technology for medlar |
| CN112179125A (en) * | 2020-10-15 | 2021-01-05 | 河南科技大学 | Grain drying method and system |
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