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The refrigerating dryer, referred to as the dryer, is the most commonly used water removal drying equipment in compressed air aftertreatment systems. It uses the principle that wet air has a constant moisture content (mg/m3) as the temperature decreases, and uses refrigeration technology to reduce the temperature of the compressed air, forcing the water vapor and oil vapor to condense into liquid water. And oil, and then the compressed air is heated to reduce its relative humidity, and is transported to the tracheal net to allow the user to obtain the dry air that suits the needs.
Since a large amount of condensed water appears inside the refrigerating dryer during operation, its working temperature must be higher than the freezing point of water, so the cooling temperature cannot be very low. The dew point of the modern industrial freeze dryer is about 2~10 °C, and the dew point converted to atmospheric pressure is about -17~20 °C (0.7MPa)