Air compressor selection
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In the external compression process, after pressure reduction is applied, the efficiency of the air compressor appears to be lower; therefore, it is not advisable to choose an air compressor with a low designed exhaust pressure at the time of selection. For example, if the exhaust pressure was originally set at 0.52 MPa, it is now set at 0.48 MPa. Will it work? What impact will it have on the air separation unit? I hope the expert can provide an answer
During design, unless it is done with great precision, it is not possible to achieve accurate control over the frictional losses in various components; for example, the losses associated with valves, flow meters, plates, beds, and towers all need to be controlled very precisely. During construction, it is also necessary to follow the requirements strictly, so as to select a air compressor with lower pressure ratings from the outset. After all, for a brute-force type of resistance control, an air compressor with an exhaust pressure of 6.1~6.2 is selected; if the resistance is low when operation starts, it is possible to reduce the pressure further. If a compressor with low exhaust pressure is chosen from the start, and the actual system resistance is high, it will be frustrating. . By then, not only might there be an issue with the capacity, but the pressure ratio could also be problematic. It’s impossible to change it.
The selection of an air compressor depends on the pressure design of your overall system, and it is primarily limited by factors such as the minimum pressure required for the liquid air from the lower tower to enter the upper tower. It is best for a centrifugal air compressor to operate efficiently within its designed rated range. Of course, current air separation design and manufacturing manufacturers are also striving to reduce the operating pressure of the systems.