Abstract: When the main oil pump of cracking gas compressor, propylene compressor and ethylene compressor in ethylene plant fails or drives steam fluctuations, the pressure of lubricating oil decreases to below the set pressure of spare oil pump, and the lubricating oil required by the compressor unit cannot be replenished in time after the startup of the spare pump, resulting in low low pressure interlock shutdown of compressors. Through the calculation of oil circuit data, some measures are put forward including the installation of energy accumulator on lubricating oil main to improve the anti-fluctuation capacity of the oil system of key compressors, so as to reduce the number of unscheduled shutdown of the ethylene plant.

Key words: compressor}oil system}anti-fluctuation