Working principle of freezer dryer:
Cooling process: The humid and high-temperature compressed air first enters the pre-cooler, where the temperature of the compressed air is initially reduced by means of heat exchange with the external environment to achieve a certain degree of pre-cooling. It then enters the heat exchanger to transfer heat with the cold air that has been cooled. According to the principle of heat conduction, the heat of the high temperature compressed air is transferred to the low temperature cold air, so that the temperature of the compressed air entering the evaporator is significantly reduced, creating favorable conditions for the subsequent condensation process.
Condensation process: In the evaporator, compressed air and refrigerant heat exchange. The refrigerant evaporates and absorbs heat in the evaporator, and the temperature of the compressed air drops rapidly according to the principle of thermodynamics. When the temperature of compressed air falls below its dew point, the water vapor in it will undergo a phase change due to saturation and condense into liquid water droplets. This process follows the physical law of the relationship between the saturated vapor pressure of water and temperature, that is, when the temperature is reduced, the saturated vapor pressure of water vapor in the air is reduced, and when the actual vapor pressure is higher than the saturated vapor pressure, water vapor will condense.
Separation process: The water droplets formed by condensation are separated from the air by the strong centrifugal force generated by high-speed rotation in the gas-water separator. According to the principle of centrifugal separation in fluid mechanics, the water drop is thrown to the wall of the separator under the action of centrifugal force due to its large mass, and flows down along the wall, and finally exits the system through the automatic drainage valve, while the dried air continues to flow in the flow channel in the dryer.
Heating process: The cold air after cooling is exchanged with the hot and humid air again in the air heat exchanger. This step is based on the principle of heat balance, through the heat exchange to make the cold air temperature rise properly. This can effectively prevent the outlet air in the subsequent pipeline transmission process, due to the large temperature difference with the outside environment and condensation phenomenon, to ensure the normal operation of the pipeline system and dry air delivery.
Adsorption dryer working principle:
Adsorption process: The compressed air output by the air compressor flows into the dryer through the inlet pipe, and enters the running tower in the two adsorption towers through the air valve. The adsorption tower is filled with a specific adsorbent, such as activated alumina, molecular sieve, etc. These adsorbents have abundant micropore structure and large specific surface area. According to the adsorption principle, when the humid air passes through the adsorbent bed, the water molecules in the air are driven by the intermolecular force such as the van der Waals force, and are adsorbed by the adsorbent surface and micropores, so that the air can be dried. This process involves the physical adsorption between the adsorbent and water molecules, and its adsorption capacity is closely related to many factors such as the nature of the adsorbent, air humidity, temperature, pressure and gas flow rate.
Regeneration process: When the adsorbent adsorbent in the running tower reaches saturation, the system will automatically switch to another adsorption tower for drying, and the original running tower will enter the regeneration stage. The regeneration process lasts about 4.5 minutes, during which dry air (usually partially dried finished gas or externally imported dry air) is reverse-fed into the non-running tower. According to the desorption principle, during the flow of dry air in the tower, the partial pressure of water vapor around the adsorbent is reduced, so that the water adsorbed on the adsorbent is removed from the surface of the adsorbent under the drive of the concentration difference, and the adsorption tower is taken out with the air flow, so as to realize the regeneration of the adsorbent. When switching between the regeneration process and the drying process, a 0.5 minute continuous pressure time is set, which aims to stabilize the pressure in the adsorption tower, ensure the continuity and stability of the entire drying system, and avoid problems such as abnormal air flow or decreased adsorption performance caused by pressure fluctuations.
Industry outstanding company：
Hangzhou Risheng Decontamination Equipment Co.,Ltd. Founded in 1992, it is an excellent company with many years of deep cultivation in the field of compressed air treatment. Products cover frozen compressed air dryers, adsorption dryers and other series, a wide range of capacity and pressure, to meet the divers