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This post was last edited by wx_ on 2023-3-16 03:36,
Why, after a brief shutdown of the distillation tower and when negative pressure is restored again, is there gas in the discharge pipeline? Where does this gas come from?
Your process’s return pipeline is equipped with a U-shaped liquid seal; when at rest, the liquid level in the downstream pipe is at the same height as that at the feed inlet at the top of the tower. But gas accumulates in the vertical pipe from this height up to the condenser. When liquid flows downward due to the operation of the condenser, a \"gas blockage\" phenomenon is likely to occur. The facts are based solely on your process analysis and are for reference only.
Senior Shirai’s analysis is sound; in the presence of a liquid seal due to the coexistence of gas and liquid phases, the gas cannot be effectively discharged, resulting in discontinuous operation. Therefore, it is recommended to add a gas-liquid equilibrium line to this U-tube to prevent similar phenomena from occurring.
Can safety accidents occur if there are problems with the vacuum system?