Air compressor drying equipment – advantages and disadvantages of freeze dryer and suction dryer

Freeze dryer and adsorption dryer are both drying equipment, why is there such a big difference?

1. Advantages and disadvantages of cold dryer

Full name: Freeze Dryer

Advantage:

a. There is no compressed air consumption, and most users do not have very high requirements for the dew point of compressed air. Using a cold dryer saves energy compared to using an adsorption dryer;

b. There is no need to add or replace the adsorbent regularly;

c. The operation noise is low; the suction dryer has the noise of depressurization of the adsorption tower, and in the air compressor room, the operation noise of the cold dryer is generally not heard;

d. No wear of valve parts;

e. The daily maintenance is relatively simple, as long as the automatic drain filter is cleaned on time;

f. There are no special requirements for the pre-treatment of the air source and the supporting air compressor, and the general oil-water separator can meet the air quality requirements of the cold dryer;

g. The cold dryer has a “self-cleaning” effect on the exhaust, that is, the solid impurity content in the exhaust gas is less;

h. While discharging the condensed water, part of the oil vapor can also be condensed into liquid oil mist and discharged along with the condensed water.

Shortcoming:

The effective air supply volume of the freeze dryer can reach 100%. However, due to the restriction of the working principle, the dew point of the air supply of the freeze dryer can only reach about 3°C (pressure dew point), and it is affected by the intake air temperature. It is very large. For every 5°C increase in the intake air temperature, the cooling efficiency will drop by 30%, and the dew point of the supply air will increase significantly, which is greatly affected by the ambient temperature.

2. Advantages and disadvantages of drying machine

Full name: adsorption dryer

Advantage:

a. Compressed air dew point can reach -70℃;

b. Not affected by ambient temperature;

c. There are many filtering effects and filtering impurities.

Shortcoming:

a. Compressed air consumption is 6%;

b. It is necessary to add and replace the adsorbent regularly;

c. The operating noise is 65 decibels.

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