Microwave drying is an important application of microwave technology in food processing. It mainly uses the heating effect of microwave to increase the temperature of the system, thus causing moisture vapor to achieve drying. Microwave drying is divided into two categories : microwave atmospheric pressure drying and microwave vacuum drying. 

The core of microwave drying equipment is microwave generator. At present, the frequency of microwave drying is mainly 2450MHz, which is mostly used in the drying of chemical industry, food, agricultural and sideline products, wood, building materials, paper products and other industries, and can also be used for the sterilization of food and agricultural products. In the traditional drying process, in order to improve the drying speed, it is necessary to increase the external temperature and increase the temperature gradient, but it is easy to produce endogenous external focal phenomenon. However, when microwave heating is used, regardless of the shape of the material, the heat can be evenly infiltrated, and the expansion effect can be produced, which is conducive to crushing. 

Under microwave irradiation, the drying material is uniform and the heating rate is uniform. Moreover, microwave drying does not affect the color of the material will be dried, smell, taste and tissue structure, the active ingredient is not easy to decompose, damage. Relevant research institutions use traditional drying methods to replace the traditional use of microwave drying ovens to solve problems, such as uneven drying, which is easy to produce dry river drugs. 

For processing high value-added agricultural products, such as dehydrated vegetables, dehydrated meat products, dehydrated seafood, etc., these semi-finished products or products produced by microwave drying equipment, light weight, good rehydration performance, color and state after rehydration Fresh, easy to carry, store and transport, stored at room temperature for 3 years. These processed dehydrated products., as a higher ingredient. It can be used as a convenient food such as instant noodles, convenient rice flour seasoning bag ingredients. 

2.For the production of condiments : If ginger and garlic are treated at high temperature, the spices of the two materials are easily damaged, resulting in a decrease in their content. If garlic and ginger are treated with microwave drying equipment, the nutritional components and flavor substances of raw materials can be better retained, and high-quality ground ginger and garlic powder can be produced.