The vacuum side-stream oil contains impurities
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This post was last edited by cn2009 on 2015-7-22 at 14:25. Recently, it has been observed that the vacuum distillation side stream oil often contains small black particles and suspended matter; this phenomenon occurs especially when changing the type of crude oil used, as well as when the yield from vacuum distillation is high and the flow rate increases. The amount of such particles decreases gradually after reducing the volume of distillates produced. What could be the reason for this?
What is the outlet temperature of the vacuum furnace? Particles taken out via the side stream after coking?
There must be some area where coking has occurred; fluctuations in operations can easily lead to extraction through the side stream； Do you blend coking wax oil? This situation can also occur if blending is used.
I agree with the view on coking, but coking should occur at the bottom of the tower or at the minus-five line. Can particles be carried up to the top of the tower? There are levels at minus one, minus two, and minus three – what is the reason for that?
I agree with the view that coking occurs; no coker wax oil has been blended in. It mainly happens in the first, second, and third stages. Can coking that occurs at the lower part of the tower be carried upward?
In some areas, there is a drying plate phenomenon; part of the oil has carbonized. It is still necessary to control the gas-liquid phase equilibrium and increase the flow rate for displacement.
It must be for this reason :handshake
The processing volume is low, resulting in insufficient reflux; coking may also occur at the tray level. Furthermore, fluctuations can lead to entrainment, causing coked particles to appear in the side streams.
It could be pipeline corrosion; don’t take it lightly! ! :Q:Q