How is the sequence of lifting and lowering volumes in a atmospheric and vacuum distillation unit determined?
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In the questions related to unit operation, when increasing the processing capacity of a atmospheric and vacuum distillation unit, the feed to the vacuum furnace is increased first, followed by the feed to the atmospheric furnace, and finally the amount of raw material fed into the unit； How was it determined that when reducing the volume, the feed rate of raw materials should be reduced first, followed by the amount fed to the atmospheric pressure furnace, and finally the amount fed to the vacuum furnace?
It was summarized by senior operators from actual work experience. It’s a minor adjustment to ensure more room for adjustment in the future.
I disagree; most pumps nowadays are variable-frequency pumps, so the impact is minimal
Prevent the tower from being flooded due to a full liquid level at the bottom, and maintain material balance
We operate at atmospheric pressure; when the flow rate needs to be reduced, we simply adjust the outlet control valve of the primary low-pressure pump. The liquid level in the primary distillation tower is controlled in conjunction with the feed pump – when the amount of fluid flowing out decreases, the flow rate of the crude oil pump also drops. As a result, less adjustment is needed for the four feed streams in the atmospheric pressure furnace