What is the role of cold dryer and suction dryer in air compressor

Air compressor in the cold dryer and dry machine in the compressed air processing process plays an important role, their main role is as follows:

the role of cold dryer

cold dryer, that is, freeze dryer, mainly through refrigeration technology to cool and remove water. Its working principle is to use the refrigerant and compressed air for heat exchange, the compressed air temperature down to 2~10 ℃ dew point temperature, so that the water content in the compressed air tends to be supersaturated, which condenses into liquid water and is discharged out of the system to achieve the purpose of water removal and drying. The main functions of the cold dryer include:

1. remove moisture and oil: The cold dryer can quickly reduce the temperature of the compressed air, condense the water vapor and oil vapor into a liquid state, and separate it from the air, thereby avoiding the corrosion and damage of these impurities to the equipment.
2. Prevent oxidation and rust: By removing the moisture and oil in the compressed air, the cold dryer improves the air quality, reduces the damage of impurities to the equipment pipeline, and helps to prevent the oxidation and rust of the equipment.
3. Improve equipment efficiency: The cold dryer purifies the compressed air and reduces the influence of impurities on the performance of the equipment, thereby improving the efficiency and production efficiency of the equipment, and extending the service life of the equipment.
4. Guaranteed product quality in industrial production fields that require clean and dry air, such as the food and pharmaceutical industries, cold dryers can ensure the quality of compressed air, thereby ensuring the quality of products.

The role of suction dryer

the suction dryer, that is, the adsorption dryer, mainly through the adsorption material to absorb the moisture in the compressed air to achieve the drying effect. Its working principle is to use adsorbents (such as silica gel, activated alumina and molecular sieve) to adsorb moisture in compressed air, so as to achieve the purpose of deep drying. The main functions of the suction dryer include:

1. remove moisture and oil: The suction dryer can effectively remove the moisture and oil in the compressed air, making the air source more pure.
2. Increase gas pressure: While absorbing impurities such as moisture and oil, the suction dryer can also increase the pressure of the gas to meet the demand for gas sources in industrial production.
3. PROTECTION EQUIPMENT: By removing the moisture and oil in the compressed air, the suction dryer can protect the subsequent equipment and extend the service life of the equipment.
4. deep drying compared with the cold dryer, the suction dryer can usually reach a lower dew point temperature (below -20 ℃) to achieve deep drying, which is suitable for occasions with high requirements on the dew point of compressed air.

difference between the two

1. working principle: The cold dryer uses refrigeration technology to cool down and remove water, while the suction dryer absorbs water through adsorption materials.
2. dew point temperature the dew point temperature of the cold dryer is usually 2~10 ℃, and the suction dryer can usually reach a lower dew point temperature (below -20 ℃).
3. Energy consumption the power of the cold dryer may be on the high side, while the power of the suction dryer is usually only about tens of watts because the valve is controlled by the electric control box.
4. Regeneration gas loss: The cold dryer has no air loss, while the desiccant needs to be regenerated after water absorption saturation, so there will be about 12-15% regeneration gas loss.
5. failure rate: The refrigerant system and air system of the cold dryer are relatively complicated, including electrical parts, while only the valve of the suction dryer has the possibility of failure due to frequent actions, so the failure rate of the suction dryer is lower than that of the cold dryer under normal circumstances.

In summary, both the cold dryer and the suction dryer play an important role in the air compressor system. They each have unique working principles and advantages, and can be selected according to actual needs and working environment.