Microwave powder drying sterilization principle and application

Uses: Used for drying and dehydrating powdery and granular materials. Conventional heating such as flame, hot air, electric heating, steam drying, etc. all use the principle of heat conduction to transfer heat from the outside of the object to be heated, and gradually increase the temperature of the center of the object, which is called external heating. It takes a certain amount of time for the center to reach the desired temperature, and objects with poor thermal conductivity take longer. These traditional drying methods take a long time, consume large amounts of electricity, heat is not uniform, flipping up and down, labor intensity is large, and microwave energy drying characteristics, microwave energy can penetrate inside and outside the object while heating, the frequency is 2450MHZ, at 24 per second. With an oscillation of 50 million times, the water molecules are also 245 million times of oscillations. The molecules rub each other to generate heat, and they heat up. Therefore, it can be widely used for drying and dehydrating powdery materials of chemical products. For example: cobalt oxalate, lithium hydroxide, nickel hydroxide, mannose pure, ammonium paratungstate, lithium cobalt oxide, etc., the water content from 0.5% after drying to 0.5%, drying time only 5 to 6 minutes, drying temperature can be controlled at 80 °C ~ 90 °C.

 

Features of microwave drying:

1. Selective heating. Since water molecules are best for microwave absorption, the portion with a high water content absorbs more microwave power than the portion with lower water content. This is the characteristic of selective heating, which allows uniform heating and uniform drying.

2, energy efficient. The microwave directly acts on the material, so there is no additional heat loss, the air in the furnace and the corresponding container will not heat, so the thermal efficiency is extremely high, the production environment is also obviously improved, and the electricity can be saved by 30% compared with the far infrared heating. .

3. Short time and high efficiency. Microwave heating is a process in which the object to be heated itself becomes a heating element and does not require heat conduction. The microwave penetrates the inside and outside of the object from all sides while simultaneously achieving uniform heating of the object in a short time, which greatly shortens the drying time.

4, easy to control, advanced technology. Compared with the conventional method, the device is ready to use; without thermal inertia, the operation is flexible and convenient; the microwave power is adjustable, and the transmission speed is adjustable. In microwave heating, drying, no waste water, no waste gas, is a safe and harmless high-tech.