Do you know the difference between cold dryer and suction dryer?

Cold dryer and suction dryer are two different kinds of drying equipment, they have significant differences in working principle, energy loss, gas loss, and application.

1. Working principle:
   • cold dryer is the use of refrigerant and compressed air for heat exchange, the compressed air temperature down to 2~10 ℃ range of dew point temperature, so as to achieve the effect of drying.
   • The suction dryer is based on the principle of pressure swing adsorption, by allowing compressed air to contact with the desiccant under a certain pressure, the vast majority of moisture adsorption in the desiccant, to achieve the purpose of deep drying. The dew point temperature of the outlet can reach below -20 ℃.
2. energy loss:
   • cold dryer through the refrigerant compression work to achieve the purpose of cooling, so the need to adapt to a higher power supply, energy loss is relatively large.
   • The suction dryer only controls the valve through the electric control box, and the power supply is low, so the power loss is less.
3. Gas loss:
   • the cold dryer removes water through variable temperature, and there is no loss of air during the working process.
   • And because the desiccant needs to be regenerated after water absorption saturation, there will be about 12-15% regeneration gas loss.
4. Application areas:
   • cold dryer is widely used in industrial production, food processing, medical and health, environmental protection, energy and transportation and other fields, mainly used for compressed air drying treatment.
   • The suction dryer is more used in scenarios that require deep drying, such as the food industry, the pharmaceutical industry, and the chemical industry. In food production, it can effectively remove the moisture in food and extend the shelf life; in the pharmaceutical process, it is used to prepare dry pharmaceutical raw materials, intermediates and finished products; in the chemical industry, it is used to remove chemical raw materials and products in Moisture.

In summary, there are obvious differences between the cold dryer and the suction dryer in terms of working principle, energy loss, gas loss and application fields. Which device to choose depends on the specific application requirements and scenarios.