分析了空分设备闭式循环氮水预冷系统杂质浓缩的原因，提出了处理措施。
Analysis focuses on the reason for impurity concentration in closed-cycle nitrogen-water precooling system of air separation unit. The solution to this problem is also presented.
针对气体车间制氮装置预冷空气温度过高的问题，提出了利用冷媒水降低预冷空气温度的措施及工艺改造方案，并对空气冷却器的工艺计算做了较详细的介绍。
Since the pre cooling air temperature of nitrogen unit is too high, the measure and process design scheme for using the refrigerant water to reduce the pre-cooling air temperature are recommended.
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