sources of solid particles in compressed air

There are also two sources of solid particles in compressed air: ambient air, which contains a large amount of suspended particles.  According to GB3095-1996 "Environmental Air Quality Standard", the annual average concentration of total suspended particulate matter (≤100μm) in ambient air in industrial zones shall not exceed 0.5mg/m3 (standard state).  According to the prevailing theory in the industry, about 80% of these suspended particles have equivalent diameters less than 2μ m.  In general, the filter accuracy of the air intake filter of the air compressor is also 2 μ m (the filter accuracy of 2 μ m is sufficient to protect its moving parts, and too high a filter accuracy may generate pressure drop and lead to negative pressure), so it is estimated that 0.4mg/m3 of suspended particles enter the compressed air system.  -In most situations inside the system, solid particles generated in the compressed air system are fatal.  Most air compression stations in China use ordinary carbon steel pipes as transportation pipes for compressed air.  These pipeline valves may produce: rust/rust mud, carbon deposition, welding slag and other impurities much larger than suspended particles in the air.  In some demanding occasions, such as medicine, electronics and other factories, the compressed air system of air compression stations uses stainless steel or red copper materials. At this time, the solids in the compressed air often come from the atmosphere and drying systems (such as adsorbent dust of adsorption dryers, etc.).