What is the difference between a suction dryer and a cold dryer

Dryer and cold dryer are two different kinds of drying equipment, which have significant differences in working principle, drying degree and energy consumption.

1. working principle:

the working principle of the suction dryer is mainly based on the principle of pressure swing adsorption, through the desiccant (such as alumina) adsorption of moisture in the compressed air, so as to achieve the purpose of drying. When saturated compressed air is in contact with the desiccant under a certain pressure, most of the moisture will be adsorbed in the desiccant, so that the dry air into the downstream work.

The cold dryer is based on the principle of freezing and dehumidification, cooling the saturated compressed air from the upstream to the dew point temperature through heat exchange with the refrigerant. In this process, a large amount of liquid water will condense out, and then automatically discharge through the gas-liquid separator Outside the machine, in order to achieve the effect of water removal and drying.

Degree of 2. drying:

because the desiccant used in the suction dryer can deeply absorb water, the dew point temperature of the outlet can usually reach below -20 ℃, realizing deep drying, so the suction dryer is far better than the cold dryer in terms of water removal effect.

The dew point temperature of the cold dryer is usually 2~10 ℃, and if the temperature is too low, there may be icing, so the degree of drying is less than that of the suction dryer.

3. energy consumption:

the cold dryer needs to be compressed by the refrigerant to achieve the purpose of cooling, so the power consumption is relatively large.

In contrast, the suction dryer only needs to control the valve through the electric control box, and its usual power consumption is only tens of watts, so the energy consumption is far lower than that of the cold dryer.

To sum up, there are obvious differences in the working principle, drying degree and energy consumption between the suction dryer and the cold dryer. The specific choice of equipment depends on the actual application scenarios and needs.