Microwave dryer for mineral powder
Microwave drying is a new drying method. When drying, the microwave energy directly acts on the medium molecules and converts them into heat energy. Because the microwave has the penetrability to heat the medium inside and outside at the same time, there is no need for heat conction, so the heating speed is very fast. For the food with water content less than 30%, the drying speed can be shortened by hundreds of times. At the same time, regardless of any shape of the object, because the medium inside and outside of the object is heated at the same time, the temperature difference between the inside and outside of the material is small, and the heating is uniform, so that the external coke is not generated in the conventional heating, and the drying quality is greatly improved
As we all know, the boiling point of water is directly related to atmospheric pressure. The lower the atmospheric pressure is, the lower the boiling point of water is. For example, at an atmospheric pressure (101.3kPa), the boiling point of water is 100 ℃, while at -0.073 MPa, the boiling point of water is 45 ℃, and at -0.08 MPa, the boiling point of water is 35 ℃. Therefore, under vacuum condition, the moisture in the material evaporates at low temperature. To achieve the purpose of low temperature drying
Tenebrio molitor microwave dryer is suitable for drying puffing of Tenebrio molitor and other insects. The dried Tenebrio molitor has golden color, soft and crisp, which can effectively maintain its internal nutrients. The efficiency of the equipment is high, which can reach several to dozens of times of the traditional process. At the same time, it saves energy consumption and has no environmental pollution, It is an advanced microwave drying equipment.
1. High efficiency: its proction efficiency is 4 times of conventional drying
2. Good heat distribution: e to the selective heating of water molecules by microwave, the moisture content in the material is high, which is consistent with the water diffusion direction from the inside to the outside, and the temperature difference between the inside and the outside is small, so the phenomenon of uneven heat distribution in conventional drying will not appear
3. Easy to control: the adjustment of microwave vacuum can be controlled by PLC programming, and a special mirror is installed outside to observe the whole drying process
4. Good quality: the effective ingredients are not easy to decompose and destroy at low temperature, and have the effect of disinfection and sterilization, which can extend the shelf life
5. It can be crushed according to the user's requirements
6. It can transport media with high viscosity and containing gas, solid particles or fibers, as well as various corrosive media
7. Economic energy consumption and high degree of automation
8. Low temperature and high efficiency: it is well known that the boiling point of water decreases with the decrease of air pressure. For example, at a standard atmospheric pressure, the boiling point of water is 100 ℃, while at 0.073 atmospheric pressure, the boiling point of water is 40 ℃. In vacuum condition, heating the object can make the internal water evaporate without temperature rise. The drying speed of microwave vacuum low temperature drying is much higher than that of conventional drying, and its ratio is generally more than ten or even dozens
9. Improving quality: drying in low temperature and oxygen free environment can ensure the quality of procts
microwave drying of honeycomb ceramics has the advantages of fast speed, no cracking, no deformation and thorough drying. Because the moisture content of the ceramic embryo is less in the sintering process, the defective procts can be greatly reced and the proction and quality can be improved
microwave is an electromagnetic wave whose frequency ranges from 300 MHz to 3000 GHz. Its heating principle: the water molecules in the heated medium materials are polar molecules. Under the action of fast changing high frequency electromagnetic field, its polar orientation will change with the change of external electric field, resulting in molecular motion and friction effect. At this time, the field energy of microwave is transformed into the heat energy in the medium, which makes the material temperature rise and proces heat energy to achieve the purpose of microwave heating and drying. Its heating speed is fast, more than 1 / 3 energy saving than infrared.