The reason for the surge of air compressor in air separation unit is that the discharge pressure of air compressor is high, and the displacement of air compressor is relatively small. The continuous discharge of gas makes the outlet pressure of air compressor continuously increase, so the high-pressure gas in the pipe network flows back into the air compressor flow channel, and the pipe network pressure drops. The air compressor continues to work, and the exhaust gas makes the outlet pipe network pressure rise again, and it will happen again and again There was a surge.