Spouting Technology in Energy-Carrying Electromagnetic Field Drying of Agricultural Products

Abstract

As a new generation of energy-carrying electromagnetic fields (after the electromagnetic field acts on the material, it is absorbed and converted into heat, providing energy for material drying), high-efficiency drying technology, microwave drying (MD), infrared drying (IRD), and radiofrequency drying (RFD) are widely used in agricultural product processing, but uneven drying is the main technical problem for the application and promotion of this technical means. Through the jet mode of pulse generated by compressed air, the materials can be evenly mixed on a large spatial scale. At the same time, air spouting has little effect on the energy transmission and distribution of energy-carrying electromagnetic fields, which is an important means to improve the uniformity of microwave and infrared efficient drying. This paper summarizes the working principle, innovative development, and numerical simulation of spouted bed in microwave and infrared drying; focuses on the cooperative working mode, drying object, and product characteristics of spouting technology in microwave hot air drying, microwave vacuum drying (MVD), and microwave freeze drying (MFD); and expounds the application and technical advantages of spouting technology in IRD. The feasibility of applying spouting technology in RFD was proposed. The review materials provide technical reference for improving the quality of microwave, infrared energy-carrying electromagnetic field efficient drying agricultural products.