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What is the difference between a refrigerated dryer and an adsorption dryer?

2018-10-12 15:31:52

In modern enterprises, the use of compressed air is becoming more and more common. Common compressed air dryers mainly include adsorption dryers and freeze dryers. What is the difference between a refrigerated dryer and an adsorption dryer?

Air dryer
Air dryer

 

1, the difference in working principle

The cold dryer is based on the principle of freezing and dehumidification, and the saturated compressed air from the upstream is cooled to a certain dew point temperature by heat exchange with the refrigerant, and a large amount of liquid water is condensed, and is automatically discharged out of the machine after being separated by the gas-liquid separator. In addition to the purpose of water drying. The suction dryer is based on the principle of pressure swing adsorption, and the saturated compressed air from the upstream is contacted with the desiccant under a certain pressure, and most of the water is adsorbed in the desiccant, and the dry air enters the downstream work. Thereby achieving the purpose of deep drying.

2, the difference in water removal effect

Because the cold dryer is subject to its principle, if the temperature is too low, it will freeze, so its dew point temperature is usually 2~10 °C. The dryer is because it does not have to pass the temperature change, and the desiccant (alumina) can be further dried. Therefore, the dew point of the outlet can usually reach below -20 ° C, which means deep drying can be achieved.

3. Difference in energy loss

For the dryer, the cooling power is achieved by the compression of the refrigerant, so the power supply will be high. Since the suction dryer only controls the valve through the electric control box, the electric power is usually only about several tens of watts, that is, there is no power loss.

4 difference in gas loss

Because the cold dryer achieves the purpose of removing water by changing the temperature, the water is discharged out of the machine through the automatic drainer, so there is no loss of gas volume. The dryer is required to regenerate after the desiccant is saturated with water, so it needs about 12-15% of regeneration gas loss.

 

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