Research Progress on Combined Hot Air Drying Technology and Equipment in Agricultural Product Processing.

Hot air drying is the most common drying and processing technology for agricultural products. However, the shortcomings of single hot air drying technology limit its efficient and high-quality application. Coupling with the characteristics of two or more drying technologies, the combined drying technology can form complementary advantages. In this paper, the existing superheated steam-hot air, ultrasonic-hot air, freezing-hot air, microwave-hot air, radio frequency -hot air, infrared -hot air, heat pump -hot air and vacuum -hot air in total 8 kinds of combined hot air drying technology applications and related equipment were comprehensively summarized, whereas further applicable conditions and equipment operating conditions were compared. Finally, the development trend and challenges of hot air and its combined drying technology were discussed, which provided a reference for the efficient application of hot air and its combined drying technology in actual production and life. [ABSTRACT FROM AUTHOR]