The Difference Between Freeze Dryer And Adsorption Dryer
Views : 1366
Author : Runningway
Update time : 2020-04-29 13:55:08
Although the freeze dryer and the payment dryer are both compressed air drying equipment, there are still many differences between the two. What are the differences? Let's summarize them together.
1. Difference in working principle
The freeze dryer is based on the principle of freezing and dehumidification, which cools the saturated compressed air from the upstream to a certain dew point temperature through heat exchange with the refrigerant, condenses out a large amount of liquid water, and is automatically discharged from the machine after being separated by the gas-liquid separator. To achieve the purpose of water removal and drying. The adsorption dryer is based on the principle of pressure swing adsorption, 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, So as to achieve the purpose of deep drying.
2. The difference in the dewatering effect
The freeze dryer is restricted by its principle. If the temperature is too low, icing will occur, so its dew point temperature is usually 2 ~ 10 ℃. The adsorption dryer does not need to pass the temperature change, and the desiccant (alumina) can be deeply dried, so the outlet dew point temperature can usually reach -20 ℃ or less, that is to say, it can achieve deep drying.
3. Difference in energy loss
For the freeze dryer, because the refrigerant can be compressed to achieve the purpose of cooling, the power supply will be higher. The adsorption dryer only needs to control the valve through the electric control box, so the electric power is usually only about tens of watts, which means that there will be no loss of electricity.
4. Different air consumption
Because the freeze dryer achieves the purpose of removing water by changing the temperature, and the water is discharged from the machine through the automatic drain, there is no loss of air volume. The adsorption dryer needs to be regenerated after the desiccant is saturated with water, so some 12-15% of the regeneration gas needs to be lost.
5. Different failure rates
Because the refrigerant system and air system of the refrigerated dryer are relatively complicated, including the electrical part, and the adsorption dryer has only the possibility of failure due to the frequent operation of the valve, the failure rate of the adsorption dryer is usually lower than Freeze dryer.
6. Difference in drying energy
Refrigerants for freeze dryers (R22, R600, R134a, etc.), and adsorbents for adsorption dryers (molecular sieve, activated alumina)
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