Compressed air is the second largest power source after electric power, and it is also a process gas source with multiple USES. Its applications cover petroleum, chemical industry, metallurgy, electric power, machinery, light industry, textile, automobile manufacturing, electronics, food, medicine, biochemistry, national defense, scientific research and other industries and departments.

Compressed air is naturally dry air, a colorless, odorless and odorless mixture of gases. Dry air is made up of 21% high-purity oxygen +79% high-purity nitrogen. Dry air is widely used as a pure combustion gas in gas chromatograph, gc and AAS. Generally, it is packaged by 40L high-pressure cylinder with a pressure of 13.5MPa. The actual volume is about 5.4m3, that is, 5,400 standard liters.

Because compressed air contains a certain amount of impurities, mainly: solid particles - they will accelerate the wear of gas equipment, resulting in seal failure; Water - They are the root cause of corrosion in equipment, pipes and valves. Freezing in winter can also block holes in pneumatic systems. It is worth noting that even if it is a clean pure saturated air, with the reduction of temperature, there will be condensed water columns, about every 10℃ reduction, its saturated water content will drop 50%, or there will be half of the water vapor into liquid water drops. Therefore, it is necessary to adopt the multi-stage separation and filtration device in the compressed air system or to pretreat the compressed air into dry gas with certain relative humidity. Oil content - High speed and high temperature air compressor USES lubricating oil to lubricate, seal and cool the air, but pollutes the compressed air. Although the oil-less machine, semi-oil-free machine and oil-free machine developed with self-lubricating materials have reduced the oil content in the compressed air, they have also resulted in the decrease of the life of vulnerable parts, the corrosion of the internal and pipeline system of the machine, and the increase of oil content in the screw air compressor during the wear, wear and load reduction period. For the pursuit of high reliability of the automated production line is undoubtedly a threat. The e oil brought into the system by the air compressor is not good in any case.

Compressed air is widely used in production and life. For example: the compressed air into the ball, the more air, the harder the ball; When compressed air is pumped into a tyre, it can hold a certain weight. On large cars, doors and brakes are opened and closed with compressed air; Hydraulic presses pressurize water with compressed air, which, in factories, is used to drive air hammers to strike iron. In coal mines, it can drill holes with pneumatic picks. It is also used for conveying liquids and particles in pipes.