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Split-range drying method for paddy

A paddy and drying technology, applied in the fields of paddy drying and paddy split-range drying, can solve the problem of high paddy loss, and achieve the effects of improving drying capacity, shortening drying time, and increasing precipitation rate.

Inactive Publication Date: 2010-11-10
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the working time of the rice dryer is also limited to the harvest season of rice
Therefore, when the climatic conditions are poor, the contradiction between the small output of the rice dryer and the large amount of rice that needs to be dried will be more prominent, which is also one of the reasons why the post-harvest loss of rice is higher than that in developed countries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Using a continuous rice dryer (the continuous dryer has three drying sections), the rice with a moisture content of 22.01% is dried according to the process of drying rice with a relatively high moisture content. The ambient temperature is 20.5°C and the relative humidity is 80%.

[0032] (2) In the first drying section of the continuous dryer, the temperature of the hot air is 80°C, the time for the rice to pass through the first drying section is 51 minutes, the precipitation is 1.81%, and the grain temperature of the rice is 30..1°C . The hourly precipitation rate is 2.13%.

[0033] (3) In the second drying section of the continuous (tower) rice dryer, the temperature of the hot air is 62°C, the time for the rice to pass through the second drying section is 51 minutes, the magnitude of precipitation is 1.02%, and the grain temperature of the rice It is 33.8°C and the hourly precipitation rate is 1.20%.

[0034] (4) In the third drying section of the continuous...

Embodiment 2

[0041] (1) Use a batch-type paddy dryer to dry paddy with a moisture content of 25.54% according to the process of drying paddy with a higher moisture content. The ambient air temperature is 21.5°C and the relative humidity is 80%.

[0042] (2) For the first cycle of the batch type rice dryer, the hot air temperature is 85°C, the time of the first cycle is 51 minutes, the precipitation rate is 2.50%, the grain temperature is 31.6°C, and the precipitation rate per hour is 2.94%.

[0043] (3) The second cycle of the batch type rice dryer adopts a hot air temperature of 62°C, the time of the second cycle is 51 minutes, the precipitation rate is 1.45%, the grain temperature is 33.2°C, and the precipitation rate per hour is 1.71 %.

[0044] (4) The third cycle of the batch type rice dryer adopts a hot air temperature of 56°C, the time of the third cycle is 51 minutes, the precipitation rate is 1.17%, the grain temperature is 34.9°C, and the precipitation rate per hour is 1.38 %....

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Abstract

The invention discloses a split-range drying method for paddy. The method has the technical points: performing preliminary cleaning and hot air drying on harvested high-moisture paddy, tempering, redrying and retempering the paddy, and keeping the ratio of the drying time to the tampering time within the range from 1 to 6 until the moisture content is reduced to 18.5 to 18 percent; conveying the paddy into a paddy temporary storage warehouse for slow cooling, ventilation and temporary storage; performing the hot air drying on the paddy of the temporary storage warehouse with a dryer after the paddy harvest season, retempering, drying and retempering the paddy, keeping the ratio of the drying time to the tampering time within the range from 1 to 8 until the moisture of the paddy is reduced to be below 14.5 percent; and conveying the paddy to a warehouse for storage. The method has the advantages of improving the moisture reducing rate and the utilization efficiency of the paddy dryer, reducing the loss after the paddy production caused by high moisture during the concentrated paddy harvest season, ensuring the safety for dry storage of the foodstuffs and having obvious economic benefit and social benefit on the premise of ensuring the drying quality of the paddy.

Description

technical field [0001] The invention belongs to a process for grain drying, in particular to a process for drying rice, in particular to a process for drying rice in different stages. Background technique [0002] The paddy drying of prior art mainly contains artificial natural airing, drying equipment drying, as: two kinds of batch type (intermittent) paddy drier and tower type (continuous) paddy drier. Regardless of whether it is a continuous or batch type rice dryer, their drying process is as follows: paddy initial cleaning→into the machine→drying→soaking→……→drying (reaching the calibrated moisture)→soaking→cooling→out of the machine. At present, in the paddy drying process, the function of slow su is to make the moisture and temperature in the paddy grains tend to balance. It takes 12 to 24 hours to completely balance the moisture and temperature in the grain. Therefore, the increase of the ratio of slowing time to drying time is beneficial to improve the drying quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B9/08
Inventor 刘启觉王继焕
Owner WUHAN POLYTECHNIC UNIVERSITY
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