空压机输出的压缩空气温度可达180℃，在此温度下，空气的水分完全呈气态。后冷却器的作用就是将空压机出口的高温空气冷却至40℃以下，将大量水蒸气和变质油雾冷凝成液态水滴和油滴，以便将它们清除掉。后冷却器的款式很多, 有板式、伞式、蛇管式等。双管程、单壳程立式冷却器。具有结构简单紧凑、使用方便、造价便宜、实用可靠等优点。
压缩空气系统中最重要的设备也许就是后冷却器。
Compressed air system is the most important equipment is perhaps after cooler.
对空气压缩机后冷却器流程的选择提出了新见解。
A new opinion on flow sheet selection for post cooler of air compressor was put for - ward in this article.
后冷却器上应装有自动排水器，以排除冷凝水和油滴等杂质。
After the cooler should be fitted with automatic drain device to exclude condensate and oil droplets and other impurities.
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