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This post was last edited by The one on 2026-7-24 07:54 🔣 In the ethylene plant, the outlet pressure of the propylene refrigeration compressor fluctuates excessively (±0.3 MPa), which affects the refrigeration efficiency; how can this pressure be stabilized? 🚩 Fluctuations in the pressure of the refrigeration compressor can lead to \"unstable cold box temperature\", affecting the accuracy of ethylene separation; stability is achieved through \"optimized load adjustment + control of suction parameters\". Impact: ① Temperature fluctuations within the cold box exceeding 5°C, resulting in unstable operation of the demethanization tower ； ②Fluctuations in the reflux ratio of the propylene distillation column result in product purity falling outside the specified limits ； ③Compressor energy consumption increases by 8%-12%. Stabilization scheme: ① Use variable frequency to adjust the compressor load (adjust the speed dynamically based on cooling capacity requirements; for every 1% change in speed, the outlet pressure changes by 0.05 MPa) ； ②Stabilize the propylene temperature at the compressor inlet (keep it at -40°C ± 2°C to prevent changes in the amount of gas drawn in due to temperature fluctuations) ； ③Inspect the outlet valve; if there is internal leakage, replace it. Example: After the frequency conversion upgrade of an ethylene plant, the pressure fluctuation at the compressor outlet was reduced to ±0.08 MPa.