Basic compressed air

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Product Line TrainingProduct Line - Industrial Filtration TechnologyStatus: July 2010 01 Basics of Compressed Air C - Generation & Pollution

2ContentFunctionalityType of contructionAtmospheric PollutionSystem Pollution


FunctionalityCompressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible, so the main action of a pump is to pressurize and transport liquids.A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.








VOCVOCCompressed AirCompressorAtmospheric Pressure 1 barCompressed Air Pressure 7 bar

Atmospheric AirCompressor

5ContentFunctionalityCompressor TypesAtmospheric PollutionSystem Pollution

6Compressor TypesPositive DisplacementDynamicReciprocatingRotaryLobeLiquid RingScrewVaneScrollSingle-ActingDiaphragmDouble-ActingCentrifugalAxialCompressor TypesOverview

7Compressor TypesDynamicCentrifugalAxialCompressor TypesDynamic CompressorsDynamic compressor depends on a rotating impeller to compress the air. In order to do this efficiently, centrifugal compressors must rotate at higher speeds than the other types of compressors. These types of compressors are designed for higher capacity because flow through the compressor is continuous and oil free by design.

8Compressor TypesCompressor TypesPositive DisplacementRotaryLobeLiquid RingScrewVaneScrollRotary CompressorRotary air compressors are positive displacement compressors. The most common rotary air compressor is the single stage helical or spiral lobe oil flooded screw air compressor, consisting of two rotors within a casing where the rotors compress the air internally. There are no valves. These units are basically oil cooled with the oil sealing the internal clearances. Since the cooling takes place right inside the compressor, the working parts never experience extreme operating temperatures making them continious duty compressors.

9Compressor TypesScrew CompressorCa. 50% of all compressors are screw compressors.Existence of two spindle-shaped rotors (screws) which attack each other.Oil-free or Oil lubricated.

Functionality1. phase:The air enters through the opening in the compressor housing.2. phase:The compressor chamber is closed by the rotation.3. phase:By reduction of the space, the air is compressed4. phase:The compressed air enters.

10Compressor TypesScrew Compressor Oil lubricatedIn case of oil lubricated compressors one part of the oil, determined by the heat and the mechanical pressure is converted into steam. Besides the steam, aerosol consisting of fine droplets and oil in liquid form is released into the air.Production of normal air quality residual oil content about 3 mg / mScrew Compressor Oil freeOil-free screw compressors are called dry running, in which the compression chamber is not lubricated and run the screws couples without contact. Highest precision in manufacturing and production make this compression principle for optimal efficiency. Can be effective over seals to ensure that no oil entering the compression chamber and contaminate the air.A) Dry Compressors: Production of high pressure air quality Residual oil content