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Surge may occur as long as the centrifugal compressor is running. This phenomenon can only be effectively controlled and reduced, but cannot be fundamentally eliminated. Therefore, correctly judging the surge phenomenon of centrifugal compressors and timely eliminating the surge area are of great significance for the safe, stable and long-term operation of the compressor. During production and operation, sometimes strong vibrations suddenly occur, and the flow and pressure of the gas medium also pulsate greatly, accompanied by periodic dull cries and strong whistling noises caused by air flow fluctuations in the pipe network. This phenomenon is commonly known as is the surge condition of the compressor. The compressor cannot operate under surge conditions for a long time. Once the compressor enters surge conditions, the operator should immediately take adjustment measures to reduce the outlet pressure or increase the inlet flow to make the compressor operating point leave the surge zone to achieve stable operation of the compressor. When the centrifugal compressor approaches surge conditions, the exhaust There will be periodic high and low wheezing noises in the air duct. When entering surge conditions, the noise increases and even sonic boom appears. ②Observe the changes in outlet pressure and inlet flow of the centrifugal compressor. During surge, periodic and large-amplitude pulsations will occur, causing the pointer of the measuring instrument to swing significantly. ③Observe the vibration of the centrifugal compressor body and bearings. During surge, the vibration amplitude of the body and bearings increases significantly, causing the unit to vibrate strongly. ④ Check the centrifugal compressor motor current. When surge occurs, the motor current will rise sharply in an instant. Large changes in inlet pressure and inlet flow may sometimes cause gas backflow, causing excessive vibration of the unit and interlocking shutdown. The pipe network has periodic oscillations with large amplitude and low frequency, accompanied by periodic roaring sounds. ⑴The working conditions of the centrifugal compressor are unstable. The outlet pressure and inlet flow rate of the centrifugal compressor will fluctuate periodically and significantly with low frequency, and the system pressure cannot reach the set pressure. ⑵ Surge has strong periodic airflow noise and airflow roar. ⑶The vibration of the bearings of the unit increases significantly and even reaches the alarm and interlock values, causing the compressor to shut down. ⑷The current of the centrifugal compressor motor rises sharply instantly. Methods to Prevent Surge in Centrifugal Compressors Introduction to methods to prevent surge in centrifugal air compressors According to the summary of major centrifugal air compressor after-sales maintenance companies, two types of anti-surge methods are commonly used in China, namely fixed limit flow rate (or minimum flow) method and variable limit flow method The anti-surge device in process operations is the anti-surge valve.