Gas fractionation propylene tower
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The thermal bypass of the gas fractionation propylene tower controls the tower pressure. Why does the pressure sometimes change like a positive dazzling wave?
Did the poster's thermal bypass pressure control valve turn on automatic? Re-adjust P, I, and D.
Manual thermal bypass regulating valve, four groups of condensation coolers
If it is controlled manually, please check it.: 1. Is there a problem with the positioner of the on-site thermal bypass regulating valve? 2. Are there internal leaks in the four sets of condensing coolers? Are there any deviations in the four sets of condensing coolers?
4# fengdingwen I think it may be caused by the large changes in the composition of the liquefied gas, resulting in large changes in the composition of the feed brought into the propylene tower or large changes in the operation of the depropanizer tower.
Fluctuations should be normal, right?
Through the tower's own parameters, top temperature and tower top reflux volume, we can see whether the change in tower pressure is related to these parameters. Changes in tower pressure are not directly determined by its control system!