Answer: Although a certain number of water baffles are set in the compressed air flow path to separate most of the condensed water droplets from the gas, those water droplets with smaller particle sizes, especially the condensed water generated after the last baffle, may still enter the exhaust channel.
If there is no obstruction, this part of the condensed water will evaporate into water vapor when it encounters heat in the precooler, which will increase the dew point of the compressed air. A gas-water separator is usually set between the precooler and the evaporator of the cold dryer to capture the water droplets that escape the net. Although only a part of the total condensed water is separated, the water droplets are often finer in size and more difficult to capture, so the gas-water separator needs to be specially designed. The most commonly used gas-water separator is the "baffle separator", and there are also two other types: "filter separator" and "cyclone separator".
