How much do you know about Drying equipment?
Drying equipment is also called dryer and dryer. A device used for drying operations to vaporize and escape the moisture (generally water or other volatile liquid components) in the material by heating to obtain a solid material with a specified moisture content.
Drying equipment is also called dryer and dryer. A device used for drying operations to vaporize and escape the moisture (generally water or other volatile liquid components) in the material by heating to obtain a solid material with a specified moisture content. The purpose of drying is for material use or further processing. So how much other knowledge do you know about it! Let's take a look at it together!
The method of dehumidification can be divided into mechanical method, thermophysical method and physical chemical method according to the principle of action. In general, thermophysical dehumidification is called drying. Drying is the use of heat to vaporize the moisture (moisture or other solvents) in the wet material, and the water vapor or steam is taken away by the airflow or removed by the vacuum pump to obtain a solid product The operation process. When drying wet materials, there are two drying processes, one is the surface vaporization process, heat is transferred from the surrounding environment to the surface of the material, so that the surface moisture evaporates, and the other is the internal diffusion control process, where the moisture inside the material is transferred to the material Surface, and then evaporate. The drying rate of the material is controlled by the slower of the above two processes.
Drying equipment through the material drying characteristics test, the material drying process can be divided into three stages. The first stage is the material preheating stage. During this period, the wet material is mainly preheated. At the same time, a small amount of moisture is vaporized. The temperature of the material quickly rises to approximately equal to the wet bulb temperature; the second stage is the constant-rate drying stage, this stage The main feature is that all the heat transferred from the hot air to the material is used to vaporize the moisture, the surface temperature of the material has been kept constant, and the moisture is vaporized at a certain rate; the third stage is the reduced-rate drying stage, at which time the drying rate of the material is diffused from the inside In process control, only a small part of the heat provided by hot air is used to vaporize moisture, and most of it is used to heat the material to increase the surface temperature of the material, but the drying rate gradually decreases until the equilibrium moisture content is reached.