Microwave drying process of peanut based on temperature control

In this paper, through the conventional microwave drying and temperature-controlled microwave drying experiments, the moisture content and sensory of peanuts were compared to verify the advantages of temperature-controlled microwave drying, which provides a theoretical basis for the popularization of crop drying technology and the design of equipment, and provides technical support for industrial management.

 microwave drying equipment

0 test equipment and materials and methods

0.1 test materials
1) material selection: fresh red skin peanuts are produced in Yucheng District, Ya'an City, Sichuan province.
2)
Material handling: using screening machine for initial screening, the size of the material is basically the same and the grain is full. The screened peanuts were sealed in 100 g each and placed in the fridge at 4~8 C for storage.
0.2 equipment and instruments
Drying equipment: self-made microwave temperature control drying equipment, with the Grace WBBH0809 microwave oven as a platform, the addition of AT89S52 microcontroller,
AD590 temperature sensor, ADC0804, A/D conversion chip, 74HC573N latch, relay and digital display block hardware. According to the test requirements, the temperature measurement and control system is designed. According to the characteristics of peanut, the corresponding temperature range is set in the program of single chip microcomputer. The temperature sensor is used to measure the real-time temperature in the drying process. When the upper temperature limit is reached, the working power supply of the microwave oven is automatically cut off, so that the temperature of the crops is reduced, and the working power supply of the microwave oven is automatically closed until the lower temperature limit is reached, and the heating is continued.

peanut microwave equipment