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Desiccant dryers are used to dehydrate atmospheric air, or pure gases including H2, N2, O2, CO2, for use in pneumatic equipment. It is important for these gases to be purified and dehydrated before use to prevent corrosion and damage to machinery.
HOW IT WORKS
Inlet air passes through the prefilter and is distributed, by use of valves, to direct the air into one of the multiple adsorbent beds, commonly filled with activated alumina, which allows the air to be dehydrated and purified. Air leaves the adsorption bed, and passes through another series of values, which distributes the dry air to another filter before use. Air that is not outlet is used as regeneration air, and directed to a different adsorbent bed so that desiccant can be regenerated once capacity has been reached. A system with two or more beds can allow constant dry air production as one bed can regenerate while the other adsorbent bed is actively dehydrating the air stream.
The physical properties of desiccants will have a significant impact on your desiccant drying system. Strong crush strength and low attrition reflect the durability of the desiccant and can indicate not only the lifespan of the product, but also that the product yield will stay greater for a longer period. If the desiccant features low durability characteristics, the adsorbent beds will need to be replenished more frequently.
Low durability adsorbents won’t yield as much dry air per cycle, which results in increased labor, production, and material costs. An additional indicator of quality desiccants is water capacity, which is an ideal balance between strength of the adsorbent and the actual amount of water that each bead can adsorb during an adsorption cycle. Hengye activated alumina HYAA300 offers an ideal combination of strength and adsorption capacity to produce quality dry air that can be trusted for use without causing damage to equipment.
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