Difference between suction dryer and cold dryer

Dryer and cold dryer are two different types of air drying equipment, which are different in working principle, performance characteristics and application scenarios. Here is a detailed comparison of the two:

working principle:

drying machine: the use of adsorbents (such as alumina or molecular sieve) to absorb water vapor in compressed air, so as to achieve the purpose of drying. Its operating principle is to turn on and off the air flow through two double barrels in turn, and to alternately perform drying and regeneration operations, so that the air flow can continuously contact the dry adsorbent.

Cold dryer: the use of refrigerant and compressed air for heat exchange, the compressed air temperature to 2~10 ℃ range of dew point temperature, so that the compressed air in the water vapor condensed into liquid water and discharged out of the machine, so as to achieve the drying effect.

Drying effect:

drying machine: deep drying can be achieved, and the dew point temperature of the outlet can reach below -20 ℃, which is suitable for applications with high dryness requirements.

Cold dryer: restricted by its own principle, the temperature is too low will produce ice blockage, the dew point temperature is usually maintained at 2~10 ℃, suitable for the application of general dryness requirements.

Energy consumption and loss:

drying machine: The power supply is relatively low, but the desiccant needs to be regenerated after the water absorption is saturated, so there will be about 12-15% regeneration gas loss.

Cold dryer: need to adapt to a higher power supply to achieve the purpose of cooling, power loss is relatively large. However, there is no loss of gas volume, because the moisture generated during operation is discharged through the automatic drainer.

Maintenance and failure rate:

drying machine: the main fault may come from the valve, which may be faulty due to frequent action. But in general, the failure rate of the suction dryer is relatively low.

Cold dryer: It is composed of three systems: refrigerant, air and electrical. The system components are relatively complex, so it may have a high failure rate. In addition, the cold dryer also needs to be checked and added regularly.

Application Scenarios:

drying machine: suitable for occasions with high dryness requirements, such as precision machinery, electrical and electronic, food processing and other industries.

Cold dryer: suitable for general dryness requirements, such as spraying, pneumatic tools, some industrial gases, etc.

In summary, there are significant differences between the suction dryer and the cold dryer in terms of working principle, drying effect, energy consumption and loss, maintenance and failure rate, and application scenarios. Which device to choose depends on the specific needs and application scenarios.