Centrifugal compressor noise analysis
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This post was last edited by liaifeng on 2018-8-4 20:37. Causes of surge and remedies: A. Excessively high discharge pressure – Empty the receiver of the compressor’s aftercooler to reduce the pressure, or open the valve for the cooling water entering the aftercooler. B. Low gas extraction rate: Open the anti-surge valve to allow the discharged gas to return to the inlet side of the rear compressor. C. High temperature of the inlet gas: Most units are equipped with a mechanism to inject a small amount of light liquid hydrocarbons upstream of the compressor’s inlet; the evaporation of this liquid cools the hot gas stream entering the compressor. It is also possible to require the preceding process to reduce the temperature of the gas entering the compressor.
When the instantaneous load changes, the speed needs to be adjusted; option A is not advisable, as it leads to increased pressure at the outlet. The best approach is to adjust both the speed and the anti-surge valve.