At present, solar drying, hot air drying, microwave drying equipment, vacuum drying and vacuum freeze-drying are the main drying technologies of green leafy vegetables. The working principle, technical characteristics and application status of these drying technologies in green leafy vegetables processing are introduced.
1.1 solar microwave drying equipment
Solar drying is a low-temperature drying technology, using solar energy as the energy source, the dried materials directly absorb solar energy, or through convective heat transfer with the air heated by the solar collector to obtain heat, the surface of the material after the heat is transferred to the material inside, so that the moisture contained in the material from the material inside the liquid. In the form of state or gaseous diffusion, it gradually reaches the material surface, and then diffuses into the air through the gas film on the material surface, so that the moisture content in the material gradually reduces, and finally realizes the drying of the material.
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