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Radio frequency and microwave drying method for preventing ultrahigh moisture grain from mildewing

A technology of microwave drying and grain, which is applied in the direction of promoting the preliminary treatment of solid material drying, drying solid material, and preserving seeds through drying, etc. It can solve the problems of slow moisture volatilization, low drying efficiency, and high labor cost of grain, and achieve the goal of improving water content. The uniformity of drying rate, the effect of improving drying rate and improving quality

Inactive Publication Date: 2014-08-06
NANJING UNIV OF FINANCE & ECONOMICS
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AI Technical Summary

Problems solved by technology

The labor cost of artificial spreading and drying in the sun is too high, and there are key restrictive factors in the latter methods, that is, the volatilization of grain moisture is slow, the drying efficiency is low, and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The corn was harvested in the place of origin without precipitation treatment. The moisture content measured by the rapid moisture analyzer reached 22%. After long-distance transport by vehicles (ships) to the storage warehouse, the total number of colonies and molds in the corn were close to the critical value, and simple drying could not be eliminated. Mold affects grain quality and performance of grain storage. A radio frequency system and a microwave system are installed at the initial feeding end of the elevator conveyor belt in the grain depot. The radio frequency heating system is a parallel plate radio frequency heating system, which can be simplified as a parallel plate capacitor composed of upper and lower plates. The heated grain is placed between the two pole plates, the alternating electromagnetic field acts on the grain through the pole plates, and the radio frequency energy acts on the grain materials along the direction perpendicular to the pole plates. ...

Embodiment 2

[0026]The difference from Example 1 is that the raw grain is rice (japonica rice), and the moisture content is 20.5% when harvested in the production area. The conventional long-distance transportation across provinces is 3 days. Due to heavy rain and high humidity during transportation, the moisture content of the grain is about 21%. Before the rice enters the warehouse, it is dried with conventional hot air, and the radio frequency and microwave treatment links are added in the middle, and the blast drying at room temperature is carried out later. The output power of the radio frequency equipment is 5kW, and the frequency is 27.12MHz; the output power of the microwave equipment is 8kW, and the frequency is 915MHz. The total time of radio frequency and microwave action is about 3 minutes, the temperature of japonica rice reaches 37°C, the total number of molds is reduced by 90%, the water content is reduced to 14%, and the conventional storage can be carried out after the tem...

Embodiment 3

[0028] The difference from Example 1 is that the first step of drying the raw grains before entering the warehouse is radio frequency and microwave drying anti-mold treatment, followed by hot air drying or blast drying after slowing down, the temperature of the corn will drop below 15°C, and the water content will drop to 14%. Regular warehousing is possible.

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Abstract

The invention discloses a radio frequency and microwave drying method for preventing ultrahigh moisture grain from mildewing. According to the method, before the newly harvested ultrahigh moisture grain is put in a warehouse, preliminary cleaning, hot air drying, tempering, radio frequency and microwave drying and tempering are performed, so that the moisture content of the grain is reduced to 13.5-14%, and then the grain is delivered into the warehouse for storage. On the premise of guaranteeing dry quality of the grain, through radio frequency and microwave drying, mold spores of the grain are restrained from growing, the moisture reduction rate of a grain drying machine is increased, the uniformity of the grain drying machine is improved, the purchasing and storing efficiency of a grain storage enterprise is improved, the situations that at grain concentrated harvest time, the grain heap heating and mildewing are caused by high moisture, then the quality of the grain deteriorates, and potential safety hazards are caused are reduced, and the radio frequency and microwave drying method has significant economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of grain logistics and storage safety, and in particular relates to a mildew-proof method for ultra-high-moisture grain radio frequency and microwave drying. Background technique [0002] In the grain harvest season, especially in rainy weather, the water content of the rice harvest is high, the relative humidity of the air is also high, the quality of the grain is easy to deteriorate, it is very necessary to dry the precipitation in time, and the amount of grain dryers Limited (grain dryers are idle for more than 90% of the year, which leads to farmers' low enthusiasm for private purchase of grain dryers), it is impossible to increase the stock in a short period of time, and the efficiency of grain dryers is also related to the climate. Poor, the higher the moisture content of the grain, the greater the need for precipitation, the longer the working time of the grain in the dryer, and the lower the efficien...

Claims

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Application Information

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IPC IPC(8): F26B3/347F26B1/00F26B23/08A23B9/08
Inventor 陈银基蒋伟鑫陈霞何荣石嘉怿王明洁邱伟芬高瑀珑
Owner NANJING UNIV OF FINANCE & ECONOMICS
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