The principle and processing method of plastic dryer

- 2022-03-08-

The plastic dryer uses this principle to dry compressed air with refrigeration technology. Therefore, the refrigeration dryer has a refrigeration system. The refrigeration system of the plastic dryer freeze dryer belongs to compression refrigeration, which consists of four basic components: refrigeration compressor, condenser, evaporator, and expansion valve. They are connected in turn by pipelines to form a closed system. The refrigerant circulates continuously in the system, changes state and exchanges heat with compressed air and cooling medium. Compressed air dryers also include adsorption dryers and dissolution dryers.
This part of the liquid in the plastic dryer is then sent to the expansion valve, which is throttled through the expansion valve to become a low-temperature and low-pressure liquid and enters the evaporator; the low-temperature, low-pressure refrigerant liquid in the evaporator absorbs the heat of the compressed air and evaporates. (commonly known as "evaporation"), and after the compressed air is cooled, a large amount of liquid water is condensed; the refrigerant vapor in the evaporator is sucked away by the compressor, so that the refrigerant is compressed, condensed, throttled and evaporated in the system. In this way, the four processes complete a cycle.
The plastic dryer is a device that emits heat, and transfers the heat absorbed in the evaporator together with the heat converted from the input power of the compressor to a cooling medium (such as water or air) to take away. The expansion valve/throttle valve plays a role in throttling and depressurizing the refrigerant. The plastic dryer simultaneously controls and adjusts the amount of refrigerant liquid flowing into the evaporator, and divides the system into two parts: high-pressure side and low-pressure side.

The plastic dryer can be removed by introducing a small amount of purging gas or condensing on the surface of a separate low-temperature condenser. This type of dryer does not use drying medium, the thermal efficiency is high, and the product is not polluted, but the drying capacity is limited by the heat transfer area of the metal wall, and the structure is also complicated. Various radiators emit electromagnetic waves in a certain wavelength range, which are selectively absorbed by the surface of wet materials and then converted into heat for drying; dielectric dryers use high-frequency electric fields to cause thermal effects inside wet materials to dry.