Fluctuation range of constant pressure control
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Air compressors require a constant outlet pressure, but fluctuations are allowed; how is the range of these fluctuations determined? What is the typical control accuracy?
The range of fluctuations isn’t fixed; it’s quite large. You can think of it as whatever value you want – but if you try to keep it within a certain limit, you won’t be able to do so, as it will frequently exceed that limit......
Isn’t there a buffer tank at the compressor outlet? The fluctuation range can be adjusted
It is generally between 0.1 and 0.3, and it will not exceed 0.3; in the case of centrifugal compressors, a value above 0.3 will cause the system to detect surge
Is this referring to a percentage? Not more than 0.3 of the set value
According to the compressor curve, it is sufficient to avoid entering the surge region; further optimization involves keeping the compressor operating as much as possible within its high-efficiency range. The control system, on the other hand, must ensure that the detection signals are sent to the DCS for processing and display; after intervention is carried out, the signals are sent back to control the valves on site. During this control cycle, it is necessary to prevent the compressor from entering the surge zone. Then you can estimate how many ms are needed. For specific details, contact the process team.