Working principle of combined low dew point dryer:

The combined low dew point dryer is composed of a cooling dryer and an adsorption dryer (with or without heat) through reasonable pipeline connections and volume matching. The cooling dryer has extremely strong water removal ability, low operating energy consumption, and no air loss. Combined with the adsorption dryer's ability to achieve a lower dew point, it maximizes the advantages of both. Before the compressed air enters the adsorption dryer, it is first pre treated with a cooling dryer to remove a large amount of moisture (about 80%) in the freeze dryer. After entering the adsorption dryer for deep drying, it can achieve a very low pressure dew point, up to -70 ℃. It uses a freeze dryer as a pre dewatering device for an adsorption dryer. By utilizing the powerful water removal ability of a refrigerated dryer, the water load on the drying tower is significantly reduced. After cooling treatment, the moisture entering the adsorption tower is about 20% of that of a regular dryer. Under other conditions, the low dew point dry air used to absorb water vapor can also be reduced by the same amount. The regeneration gas volume is about 1/5 of that of a regular adsorption dryer, which indeed creates conditions for reducing regeneration energy consumption, especially for saving regeneration gas energy consumption. Thus achieving a good economic operating point and high-quality low dew point finished gas.

Product Features

1. Low dew point: The combined low dew point dryer can achieve a very low pressure dew point, typically below -40 ℃, and can reach -70 ℃ according to different user requirements.

2. Low energy consumption: The combined low dew point dryer only requires 3% to 5% of regeneration air, greatly saving compressed air consumption.

3. We can provide compressed air with different dew points for different gas consumption points.

4. All operation switches and display instruments of the combined low dew point dryer are concentrated on the panel of the box board. The cooling dryer and adsorption regeneration dryer can operate independently or simultaneously cool and absorb according to customer needs.

5. The gas-liquid separator combines two separation technologies: cyclone separation and filter type separation. It can fully separate the cooled liquid water and fully utilize the efficiency of freeze-drying.

6. The refrigeration compressor adopts medium and high temperature fully enclosed and semi enclosed refrigeration compressors from brands such as PERFORMER from France, BITZER from Germany, COPELAND from Germany, MANEUROP from France, and CHYNTEC from Taiwan.

7. The heat exchanger and condenser of the refrigerated dryer are made of high-quality and efficient threaded pipes.

8. The adsorption dryer adopts a scientifically reasonable adsorption tower structure design, high-quality compressed air diffuser, separation plate, and airflow distribution coil design to ensure full contact between the adsorbent and compressed air, avoid tunnel effect, effectively reduce the impact of high-speed airflow on the adsorbent, reduce the wear of the adsorbent, extend the service life of the adsorbent, and ensure stable air dew point.

9. The adsorption dryer can adjust the amount of regenerated gas according to the operating load requirements of the equipment and the dew point of the air, achieving energy-saving effects.

10. The adsorption dryer uses high-performance adsorbents with larger active surface area, higher strength, and longer service life.

11. Control method: Multiple control methods are adopted according to different gas requirements of users.

Schematic diagram of air-cooled combined low dew point dryer

Working condition and technical data

Model parameters of air-cooled combined low dew point dryer