Seeking knowledge on screw compressors
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Gauge air pressure: 0.6 MPa. There are a total of 10 pneumatic on/off valves, and air is also used for purging in one other location; purging is carried out once per shift (8 hours), with 5 cubic meters of air being used each time at a pressure of 0.6 MPa. What size screw compressor is required for this purpose? 2. Will the screw compressor shut down automatically once the buffer tank is filled with air (that is, when the pressure reaches 0.6 MPa)? 3. Should this screw compressor be oil-based, micro-oil-based, or oil-free? Thank you
Let me do some rough calculations for you: PV = nRT; ρ = m/V = n*28/v = 28P/RT. From this, we can determine the density of compressed air: ρ = 28*0.6/8.3*(273+30) ≈ 6.68 kg/m3. Assuming no loss of kinetic energy, P = 1/2*ρV2, from which we can calculate V = 13.4 m/s. If you use air pipes with a DN50 diameter, then Q = 13.4*0.0019625 = 1.578 m3/min. This is a theoretical value obtained through such calculations
For a smaller scale, choose a 10m³ storage tank. Screw compressors operate in a intermittent manner with automatic shutdown. As for whether to choose an oil-based or oil-free version, it depends on your requirements for the air quality; if the requirements are not strict, an oil-based version is a good choice.