50, 60, 70, 80 °C, hot air drying, study the effects of different air temperature on the drying process and product rehydration, determine the appropriate microwave drying equipment conditions.
microwave drying equipment
1.3.2 lotus seed microwave drying equipment the study
Take 300 g of lotus seeds, set the microwave power of 1, 2 kW under vacuum condition of 0.1 MPa, vacuum microwave drying, study the influence of different microwave power on the drying process and product rehydration, and determine the appropriate vacuum microwave drying process. condition.
1.3.3 Research on Vacuum Freeze-drying Process of Lotus Seeds
300 g of lotus seeds were taken and pre-frozen at -40 °C for 2 h in a vacuum freeze dryer. Under the conditions of vacuum of 60, 90 and 120 Pa, the freeze-drying conditions were set to the first stage -20 °C/12 h. The second stage was -10 °C / 12 h, and the post-drying stage was 30 °C for 10 h. The effects of different vacuum degrees on the freeze-drying process and product rehydration were studied, and the suitable vacuum freeze-drying process conditions were determined.
1.3.4 Research on the hot air-vacuum microwave drying process of lotus seeds
Take 300 g of lotus seeds, dry the lotus seeds with suitable hot air drying conditions to a moisture content of 20%, 30%, 40%, and wet at 6 °C for 6 h, then under a vacuum of 0.1 MPa. Vacuum microwave drying was carried out under the condition of microwave power of 1 kW. The effects of different pre-drying moisture content on the drying process and product rehydration were studied, and the suitable hot air-vacuum microwave drying process conditions were determined.
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