Page 13 of catalogue Compressors of Jun Air

D2 adsorption dryer mounted on compressor

Principle of the JUN-AIR adsorption drying system (Please see drawing on opposite page): Ambient air (1) is compressed to 8 bar / 120 psi. During this compression, the air gets heated. In order to force as much water vapour as possible to condense before the air reaches the dryer, the compressed air is led through a radiator (2), decreasing the temperature of the compressed air to a level close to the ambient temperature. The air then enters a prefilter (3) with a filtration degree of 0.01 micron, where solid particles and liquids (water) coalesce inside. After removal of dirt particles and water liquids, the air is conducted to the adsorption dryer (4), which has two columns each containing activated alumina. For two minutes, the compressed air flows upwards through the desiccant bed of the first column, where the remaining moisture is adsorbed.

Model OF1202-40BD3 mounted with a dryer

Simultaneously, a small portion of the now dried air flows downwards through the other column and exhausts, removing moisture and thus regenerating the desiccant. A cam timer is activated every second minute when the compressor is running and reverses the functions of each column, thereby ensuring a continuous supply of dry air. After drying, the air passes another 0.01 micron filter (5), which retains

desiccant particles that may be carried through the system with the air. (As comparison, the smallest particle the human eye can see is in the order of 50 microns). Finally, the now completely clean and dry air flows to the air receiver (6), which has an internal protective coating, for storage and/or use.

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