The principle of heating in microwave drying equipment

Microwave drying equipment refers to electromagnetic waves with a frequency of 300 megahertz. The water molecules in the heated medium material are sexual molecules. Under the rapidly changing high-frequency electromagnetic field, its sexual orientation will change with the variation of the external electric field, causing molecular motion and mutual friction effects. At this point, the field energy of the microwave field is converted into thermal energy inside the medium, causing the temperature of the material to rise, resulting in a series of physical and chemical processes such as thermalization and puffing, thus achieving the purpose of microwave heating and drying.

The mechanism of microwave sterilization

Microwave sterilization is the result of the combined action of thermal and biological effects of electromagnetic fields. The thermal effect of microwaves on bacteria is to denature proteins, causing bacteria to lose their nutrition, reproduction, and survival conditions and die. The biological effect of microwave on bacteria is that the microwave electric field changes the permeability of the cell membrane cross-section, resulting in malnutrition, inability to metabolize normally, disorder of bacterial structure and function, inhibition of growth and development, and death. In addition, the nucleic acid (RNA) and deoxyribonucleic acid (DNA) that determine the normal growth and stable genetic reproduction of bacteria are induced by the relaxation, breakage, and recombination of several hydrogen bonds, leading to genetic mutations, chromosomal abnormalities, or even breakage.

Main characteristics of microwave heating

1. Heating quickly

Microwave drying equipment heating is different from traditional heating methods. It is the process of making the heated material itself a heating element without the need for thermal conduction. Therefore, even materials with poor thermal conductivity can reach the heating temperature in a short period of time.

2. Heating evenly

Regardless of the shape of each part of an object, microwave heating can uniformly penetrate electromagnetic waves both inside and outside the object, generating thermal energy. So the heating uniformity is good, and there will be no phenomenon of external focus or internal generation.

3. Energy saving

Due to the fact that substances containing moisture easily absorb microwaves and generate heat, there is almost no other loss except for a small amount of transmission loss. Therefore, it has high thermal efficiency and energy saving. It saves more than one-third of energy compared to infrared heating.

4. Mold prevention, sterilization, and preservation

Microwave heating has thermal and biological effects, and can sterilize and prevent mold at lower temperatures. Due to its fast heating speed and short time, it can maximize the preservation of the activity of materials and the vitamins, original color, and nutritional components in food.

5. Exquisite craftsmanship

As long as the microwave power is controlled, immediate heating and termination can be achieved. The application of human-machine interface and PLC can perform heating process and heating Programmable automation control of process specifications.

6. Safe and harmless

Due to the fact that microwave energy is controlled to operate in metal heating chambers and waveguides, microwave leakage is minimal, there are no radiation hazards or harmful gas emissions, and no waste heat or dust pollution is generated. It does not pollute food or the environment.