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nano Dryer Technology

Desiccant air dryers are used for high purity applications where pressure dewpoints of -70,-40 and -20°C are required according to ISO8573.1 humidity classes 1, 2 and 3 respectively.

Adsorption is a process whereby specific molecules (the adsorbate) adhere to the surface of a highly solid (the adsorbent) by electrostatic and molecular forces. The adsorbent has a specific pore structure which will be a combination of larger or macro pores, slightly smaller or mesopores, or very small pores known as micro pores.

The adsorbent is normally made into granules or beads which are used to form packed beds through which the adsorbate is passed and the process of adsorption can take place. The rate of adsorption is affected by several factors which ultimately determine the adsorption isotherm profile and thus the size of the packed bed.

Principles of Operation

Nano D-Series Ultra High Purity Compressed Air Desiccant Dryers use the pressure swing adsorption principle to efficiently dry compressed air. They use a heatless twin tower configuration (see diagram opposite) housed in a modular design. Each column contains a unique (and patented) desiccant cartridge which incorporates inlet and outlet filtration.

Wet air from the compressor after-cooler enters the dryer and is directed into column A. Bulk liquids (water) and particles are removed by the filtration/separation stage, which is located on the inlet to the cartridge. Water is retained within the dryer until the column is regenerated, when it will be vented to atmosphere as it is depressurised. Following the filtration stage, air passes through the desiccant bed where any remaining moisture is adsorbed. Finally, the dry air passes through a particle filter, which retains any remaining desiccant particles that may have been carried through the system (<1 micron / ISO8573.1 class 2 for dust).

Simultaneously, a small amount of dry air is counter-flowed down through cartridge B and exhausted to atmosphere, removing the moisture and regenerating the desiccant.

The dryer is controlled by a PLC which periodically switches the solenoid valves when the compressor is running, reversing the function of each column and therefore ensuring the continuous supply of dry air.


Principles of Operation

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nano purification solutions ltd
Dukesway, Team Valley Trading Estate,
Gateshead, United Kingdom, NE11 0PZ
Company Registration Number: 6258937
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