Large air-energy rehmannia dryer solves the problem of traditional drying

Rehmannia is a Chinese medicine name. Fresh or dried tubers of Rehmannia plant. It is dug in autumn, and the reed head, fibrous roots and mud are removed. It is used fresh or processed. It is divided into fresh Rehmannia, dried Rehmannia and cooked Rehmannia.

Traditional Rehmannia drying mostly adopts natural sun drying. Rehmannia is a large tuber structure in shape, and water is not easy to evaporate. Due to the long drying time, sun-dried Rehmannia is prone to mildew and rot during the drying period, and the drying rate is also low. It also has the characteristics of long processing time, high labor intensity and low efficiency.

The air energy heat pump rehmannia dryer is a new type of environmentally friendly and energy-saving drying equipment. Its working principle is based on the reverse Carnot cycle principle. It uses a small amount of electricity and a compressor to evaporate the working fluid into a gas in the evaporator after passing through the expansion valve, and absorb a large amount of heat energy in the air. The gaseous working fluid is compressed by the compressor into a high-temperature, high-pressure gas, and then enters the condenser to release heat (drying box), heating the medium that needs to be dried in the drying box. This continuous cycle of heating can heat the drying medium to room temperature ~ 85°C.