Abstract: In view of the problem of uneven heating of longan raw materials and excessive drying rate of microwave and local over-focus, the combination of intermittent microwave and variable power microwave is used for vacuum microwave drying of longan, which is analyzed from three aspects: power density, vacuum and load. The change of water ratio and drying rate of longan pulp during vacuum microwave drying process, and establish a thin layer fitting model; color, total phenol content and rehydration as indicators to establish three levels of power density, vacuum and load The orthogonal test optimizes the optimal longan intermittent vacuum microwave drying process.
The experimental results show that the effective diffusion coefficient of longan intermittent vacuum microwave drying equipment increases with the increase of microwave power density, vacuum and load reduction. The two-term model has the best fitting effect in 7 mathematical models. 12 W/g, vacuum degree 90 kPa, loading capacity 100 g is the best drying process for longan intermittent vacuum microwave drying.
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