Microwave drying is a method that uses microwave as drying medium to heat materials to promote water evaporation and remove water from materials. As a traditional drying method,
has been quite mature. In agricultural production, microwave drying has been widely used in foreign countries, but due to the high energy consumption and high cost of drying process, some domestic grain and oil processing enterprises have used it.
In the drying process of rapeseed, because of the thin cotyledons in the cortex, it is necessary to cool the rapeseed after drying in order to prevent moisture absorption and moisture regain of rapeseed. The hot air drying technology of commonly used rapeseed is: preheating, heating, drying, precipitation, cooling and cooling. In order to ensure drying speed and drying quality, the drying temperature of rapeseed is generally not higher than 75. In addition, rapeseed particles are small, and the pressure drop of hot air passing through rapeseed voids is large, so the drying wind speed should not be too fast, and the wind speed below 2 m/s is more appropriate. In the research of hot air drying technology of rapeseed, there are many and complete studies on the mechanism, technology and quality of hot air drying of rapeseed abroad, but the domestic theoretical research is relatively insufficient.
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