Microwave-hot air combined compound type rice drying method based on glass transition

A glass transition and paddy technology, which is applied in the directions of grain drying, heating to dry solid materials, and drying solid materials, etc., can solve the problems of high energy consumption, high rice bursting rate, and unobvious improvement of whole rice rate, etc., and achieve reduction Energy consumption, reduced waist burst rate, and strong deformation ability

Active Publication Date: 2019-04-16
NORTHEAST AGRICULTURAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

The hot air drying method still has problems such as high rice cracking rate, high energy consumption, and no obvious improvement in the whole rice rate in the post-processing process.

Method used

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Examples

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Embodiment Construction

[0006] Embodiments of the present invention are described in detail below. A microwave and hot air combined compound rice drying method based on glass transition, the method combines glass transition technology with microwave and hot air combined compound drying technology, when the moisture gradient inside and outside rice particles is ≤ 6% Use microwaves to make it heat up quickly to reach the state of rubber; when the rice reaches the state of rubber, dry it with hot air; the specific steps of the method are: ①. When the temperature is 20°C, put the rice into the microwave drying device with a layer thickness of 5-10mm, and carry out microwave heating for 60-75s under the microwave intensity of 1W / g, so that the surface temperature of the rice particles reaches 30°C, and the internal temperature is 45°C. -48°C; ②. Put the microwave-pretreated rice into a closed slow-soaking device, and slow-soak at 50°C for 30 minutes, so that the overall temperature of the rice particles r...

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Abstract

The invention provides a microwave-hot air combined compound type rice drying method based on glass transition, and belongs to a grain drying technology. According to the method, a glass transition technology is combined with a microwave-hot air combined drying technology, in the condition that the moisture gradient between the inner and the outer of a rice grain is less than or equal to 6%, microwaves are used for rapidly heating the rice grain, the rice is dried by hot air when reaching the rubber state, and thus the operation is completed; and according to the method, the rate of cracking at a waist of the rice is reduced, the drying time is saved, the drying efficiency is improved, and the drying energy consumption is reduced.

Description

technical field [0001] The invention belongs to the grain drying technology, and mainly relates to a rice microwave and hot air combined compound drying method based on the glass transition theory. Background technique [0002] The main components of paddy are starch and protein, among which starch accounts for about 70%. It will become a rubber state. In the rubber state, the moisture diffusion coefficient and expansion coefficient of rice are large, the elastic modulus is small, and the deformation capacity is high, and the state transition temperature is negatively correlated with the moisture content. After a large number of experiments, the glass transition temperature of each variety of rice has a linear correlation, and the glass transition temperature is about 50 °C when the moisture content of the rice moisture base is 14.5%. The moisture content of newly harvested rice is relatively high, generally about 22%-30%, and direct storage will lead to germination and mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/06F26B3/347F26B21/00F26B23/08A23B9/08
CPCA23B9/08F26B3/06F26B3/347F26B21/004F26B2200/06
Inventor 郑先哲刘辉沈柳杨朱勇刘钗刘成海
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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