Dryers are commonly used in large passenger or freight cars because the brakes of these vehicles are braked by high-pressure air. The function of the dryer is to dry the moisture in the high-pressure air to avoid the corrosion of the brake parts caused by the moisture in the air. There is a heating rod in the drying pot, which works automatically. I remember that when the temperature is below 5 degrees, the heating rod in the dryer works to dry the moisture in the high-pressure air.
Compressed air enters the air pre-cooler to pre-cool and remove part of the water, and then enters the air cooler to reduce the temperature to 2 C (dew point temperature). The moisture in the air precipitates at this temperature. The water is separated by the air-water separator and discharged by the automatic drainage valve. The dry low-temperature air enters the air pre-cooler, and then exchanges heat with the untreated compressed air to heat up the output, i.e. For the treatment of dry air.