设备系统流程 Device system flowchart

较高温度的饱和压缩空气进入冷干机的预冷器，在预冷器中与来自蒸发器的干冷空气进行热交换，降低温度后进入制冷系统的蒸发器，与冷媒蒸汽进行第二次热交换，使本身温度降到接近于冷媒的蒸发温度，在两次降温过程中，压缩空气中的水蒸汽得以凝结成液态水滴并随气流进入气水分离器，分离器中分离下来的液态水经自动排水器（未画出）排出机外，温度较低的干燥压缩空气进入预冷器，与刚进入的湿饱和空气进行热交换，使本身温度得到提高，从而在冷干机排气口得含水量较低（即露点较低）、相对湿度也很低的干燥压缩空气。 预冷器、蒸发器和气水分离器是冷干机中空气流动系统的三大组成部分。

Saturated compressed air of higher temperature enters the pre-cooler of cold dryer to exchange heat with the cold dry air from evaporator and then enters the evaporated of refrigeration system when its temperature is reduced to exchange heat with cooling vapor for the second time to reduce its temperature to the evaporating temperature of cooling medium. During the two cooling courses, the water vapor in the compressed air is turned into liquid and flows into the vapor-liquid separator. The liquid separated in the separator is drained out of the equipment through automatic drainer (not charted). The compressed dry air of lower temperature enters the pre-cooler to exchange heat with the saturated air to increase its temperature and the compressed dry air of low moisture (dew point) and low relative humidity is obtained at the outlet. Pre-cooler, evaporator and vapor-liquid are the three major parts of the air flow system in cold dryer.