冷凍式干燥機與吸附式干燥機的不同之處是什么呢？

在現(xiàn)代企業(yè)里，壓縮空氣的使用越來越普遍，常見的壓縮空氣干燥機主要有吸附式干燥機和冷凍式干燥機兩種。冷凍式干燥機與吸附式干燥機的不同之處是什么呢？

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

冷干機是根據(jù)冷凍除濕原理，將來自上游的飽和壓縮空氣通過與冷媒的熱交換冷卻到一定的露點溫度，凝析出大量的液態(tài)水，經(jīng)氣液分離器分離后自動排出機外，從而達到除水干燥的目的。吸干機則是根據(jù)變壓吸附的原理，將來自上游的飽和壓縮空氣在一定的壓力下經(jīng)過與干燥劑的接觸，將絕大部分的水份吸附在干燥劑里，干燥空氣進入下游工作，從而達到深度干燥的目的。

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

冷干機因為受到其原理的制約，如果溫度太低的話會出現(xiàn)結(jié)冰現(xiàn)象，所以其的露點溫度通常在2~10℃。吸干機則因為無須通過溫度變化，而干燥劑（氧化鋁）則又可以進行深度干燥，所以通常其出口的露點溫度可以達到-20℃以下，也就是說可以達到深度干燥。

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、能量損耗上的不同

3. The difference in energy loss

對于冷干機來說，因為要通過冷媒壓縮作功方可達到冷卻的目的，所以在電源功率上會偏高。而吸干機因為只要通過電控箱對閥門進行控制而已，所以通常用電功率只有幾十瓦左右，也就是說不會有什么電量上的損耗。

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、氣量損耗的不同

4. The difference of gas loss

因為冷干機是通過變溫來達到除水的目的，水份又是通過自動排水器排出機外，所以沒有氣量的損耗。而吸干機則因為干燥劑在吸水飽和后需要再生，因些需要有12-15%左右的再生氣損耗。

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

因為冷干機的冷媒系統(tǒng)和空氣系統(tǒng)包括電氣部分都相對復(fù)雜，而吸干機則只有閥門因要頻繁動作而具有故障可能，所以在通常情況下吸干機的故障率要低過冷干機。

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.

總的說來，吸干機無論在穩(wěn)定性還是在效果上都要優(yōu)于冷干機，只是因為要損耗一定量的再生氣，所在我們一般要客戶權(quán)衡利弊后作出選擇。不過現(xiàn)在已有越來越多的廠家選擇吸干機，應(yīng)該說這在逐漸成為一種趨勢。

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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