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Water-Injected Compressors Deliver Active Air To Sensitive Processes

01 March 2004

Water-injected compressors deliver 'active' air to sensitive processes



Following the re-launch of its Hydrovane range, which saw the
introduction of several design innovations, CompAir continues to deliver
novel solutions for compressed air users with the launch of its DH-Series
oil-free rotary screw compressor, initially offered in the 15 to 37kW
range. Targeted at applications requiring high-quality 'active' air (air
that comes into direct contact with the products and processes it
serves), the DH-Series is a water-injected, single screw compressor,
featuring switched reluctance speed regulation and a compression element
that delivers twelve pulses of air per revolution.

During the compression cycle, atmospheric air enters the compression
element and fills the flutes of the bronze single six-flute main rotor.
The carbon fibre composite gate rotors engage with the flutes and form
two compression chambers above and below the main rotor. The gate rotors
automatically follow the rotation of the main rotor, reducing the volume
in the flutes and compressing the air along the compression chambers.

Purified water from the integral reverse-osmosis water purification
system is injected into the compression element seals to cool and
lubricate the process. When the flutes align with the discharge port, the
compressed air and water mixture is discharged from the compressor
element and the water is separated from the compressed air in a vessel.

With only a 15°C temperature rise across the compression element, there
is no need for a final air cooler, which reduces pressure losses and
hence energy consumption. Indeed, CompAir claims the DH-Series to have
the lowest specific energy consumption in its class. Over the coming
months, the company plans to extend the power range of these new
compressors down to 11kW and up to 132kW.

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