Basic Knowledge of Adsorption Dryer




1. What is adsorption? How take place for adsorption?

Adsorption is an phenomenon of automatic changes of material concentration in two-phase interface. All solids have adsorption ability to certain degree, it’ll adsorb its surface for molecules, atoms, or ions of ambient medium. from the viewpoint of thermodynamic, solid surface is able to adsorb other media due to its energy, physically called " free enthalpy on surface ", it has the trends that absorbing other substances to reduce their own surface energy.


2. What is adsorbent? What is adsorbate?

Some substance has obvious adsorption function for particular medium,which called "adsorbent". the material which is adsorbed calling"adsorbate". the larger the surface area of adsorbent, the stronger its adsorption capacity under certain conditions. therefore, it is necessary to increase the adsorption area to improve adsorption capacity of adsorbent.


3. What is compressed air adsorption dryer? What are characteristics?

Compressed air dryer is a compressed air drying equipment, which has a greater adsorption capacity for vapor in the air at room temperature when using adsorbent. The characteristic is lower compressed air dew point of adsorption dryer, less water content, but more energy consumption after treatment.


4. What kinds of commonly used adsorbent for adsorption dryer?

Commonly used adsorbents: silica gel, activated alumina, molecular sieve.



5. Which several forms for adsorption dryer?

According to the regeneration way of adsorbent, it can be divided into heatless regeneration adsorption dryer and heat regeneration adsorption dryer. It also known as "pressure swing adsorption" due to isothermal adsorption work of heatless adsorption dryer; another it also known as "temperature swing adsorption" according to isobaric adsorption for heat adsorption dryer. In practice, there is a micro-heat dryer, micro-heat regeneration dryer is heating on the regeneration gas formally, it belongs to "pressure swing adsorption" dryer due to its own low water content of the dry air for using regeneration gas.


6. What effects they are for muffler in adsorption dryer?

Muffler can reduce the noise of adsorption dryer discharge from the regenerative gas. it will cause gas vibration and produce a strong exhaust noise, which generally up to 80 ~ 110dB due to a certain pressure of regeneration waste gas discharge and faster exhaust speed. according to relevant provisions, it is required to take soundproof measures when exhaust noise is greater than 75dB. In the adsorption dryer, it is likely to block muffler, and need frequent cleaning and inspection at appropriate temperature, there will be condensate accumulation due to a lot of dust and water vapor during regeneration exhaust.


7. Function of orifice of regeneration valve:

a. Reducing regeneration gas pressure to near atmospheric pressure.

b. Making regeneration air pressure is greater than resistance of adsorption bed, then ensuring that it can be discharged from the tower for desorbed water vapor.

c. Making regeneration gas continuously flows adsorption bed for specified time and it may be close to saturation before leaving tower.


Biteman modular-units desiccant dryer and high precision filter---which is not only provide technical support for completely solving water, oil, dust in compressed air and other issues, and also greatly reduce energy consumption much than traditional purification equipment. Heat-less models need 5% regeneration gas consumption, micro-heat models only need 2% re-gas consumption, greatly reducing energy consumption and production costs.

This article from BITEMAN, www.bitemantech.com

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