冷冻式干燥机与吸附式干燥机的不同之处是什么呢？

在现代企业里，压缩空气的使用越来越普遍，常见的压缩空气干燥机主要有吸附式干燥机和冷冻式干燥机两种。冷冻式干燥机与吸附式干燥机的不同之处是什么呢？

In modern enterprises, the use of compressed air is more and more common. The common compressed air dryers are mainly adsorption dryer and freeze dryer. What is the difference between freeze dryer and adsorption dryer?

1工作原理上的不同

1. Difference in working principle

冷干机是根据冷冻原理，将来自上游的饱和压缩空气通过与冷媒的热交换冷却到一定的露点温度，凝析出大量的液态水，经气液分离器分离后自动排出机外，从而达到除水干燥的目的。吸干机则是根据变压吸附的原理，将来自上游的饱和压缩空气在一定的压力下经过与干燥剂的接触，将绝大部分的水份吸附在干燥剂里，干燥空气进入下游工作，从而达到深度干燥的目的。

According to the principle of freezing and dehumidification, the saturated compressed air from upstream is cooled to a certain dew point temperature by heat exchange with refrigerant, and a large amount of liquid water is condensed and separated out of the machine automatically after separation by gas-liquid separator, so as to achieve the purpose of dehydration and drying. According to the principle of pressure swing adsorption, the saturated compressed air from the upstream will contact with the desiccant under a certain pressure, and most of the water will be absorbed in the desiccant, and the dry air will enter the downstream to work, so as to achieve the purpose of deep drying.

2除水效果上的不同

2. Difference in water removal effect

冷干机因为受到其原理的制约，如果温度太低的话会出现结冰现象，所以其的露点温度通常在2~10℃。吸干机则因为无须通过温度变化，而干燥剂（氧化铝）则又可以进行深度干燥，所以通常其出口的露点温度可以达到-20℃以下，也就是说可以达到深度干燥。

Due to the restriction of its principle, if the temperature is too low, there will be icing, so its dew point temperature is usually 2 ~ 10 ℃. Because the drying machine does not need to change the temperature, and the desiccant (alumina) can carry out deep drying, so the dew point temperature at the outlet can reach below - 20 ℃, that is to say, it can achieve deep drying.

3、能量损耗上的不同

3. The difference in energy loss

对于冷干机来说，因为要通过冷媒压缩作功方可达到冷却的目的，所以在电源功率上会偏高。而吸干机因为只要通过电控箱对阀门进行控制而已，所以通常用电功率只有几十瓦左右，也就是说不会有什么电量上的损耗。

For the cold dryer, the cooling purpose can be achieved by compressing the refrigerant, so the power supply will be higher. As long as the valve is controlled by the electric control box, the drying machine usually uses only a few tens of watts of power, that is to say, there will be no loss of electricity.

4、气量损耗的不同

4. The difference of gas loss

因为冷干机是通过变温来达到除水的目的，水份又是通过自动排水器排出机外，所以没有气量的损耗。而吸干机则因为干燥剂在吸水饱和后需要再生，因些需要有12-15%左右的再生气损耗。

Because the cold dryer is to achieve the purpose of water removal by changing the temperature, and the moisture is discharged through the automatic drainer, so there is no loss of air volume. The dryer needs to regenerate after the desiccant is saturated with water, so it needs about 12-15% regeneration gas loss.

5、故障率的不同

5. Different failure rates

因为冷干机的冷媒系统和空气系统包括电气部分都相对复杂，而吸干机则只有阀门因要频繁动作而具有故障可能，所以在通常情况下吸干机的故障率要低过冷干机。

Because the refrigerant system and air system, including the electrical part of the dryer are relatively complex, and only the valve of the dryer has the possibility of failure due to frequent action, so the failure rate of the dryer is usually lower than that of the subcooled dryer.

总的说来，吸干机无论在稳定性还是在效果上都要优于冷干机，只是因为要损耗一定量的再生气，所在我们一般要客户权衡利弊后作出选择。不过现在已有越来越多的厂家选择吸干机，应该说这在逐渐成为一种趋势。

Generally speaking, the drying machine is better than the cold dryer in terms of stability and effect, just because we want to lose a certain amount of regeneration gas, so we generally want customers to weigh the advantages and disadvantages before making a choice. But now more and more manufacturers choose the dryer, it should be said that this is gradually becoming a trend.

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