Microwave drying is a commonly used food processing technology that uses microwave energy to heat and evaporate the moisture in the materials to achieve a drying effect. This drying method is fast and energy-saving, and is widely used in food processing, chemical industry, pharmaceuticals, agricultural products and other fields.
Water molecules have a strong ability to absorb microwaves. After water molecules absorb microwave energy, the high-speed movement causes friction between molecules, which converts the energy between water molecules into heat energy. With the heating effect of microwave, the moisture in the materials gradually evaporates into water vapor to achieve the drying effect. Items suitable for microwave drying are mainly raw materials with high moisture content, such as food and agricultural products, etc. In order to avoid overheating and scorching of the products, the microwave heating power and drying time should be controlled during the microwave drying process to ensure the ideal drying effect.
It should be noted that microwave drying can evaporate the surface and internal moisture of the product simultaneously, achieving an efficient drying effect in a very short time. However, since microwave heating is non-uniform, for large and thick materials, the microwave heating power and operating frequency should be further controlled to ensure a fully uniform drying effect.
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